A reinforced concrete cantilever beam steel bar installation structure

Abstract

The utility model discloses a kind of steel reinforced concrete cantilever beam reinforcing bar installation structures, including steel beam, the steel beam includes web, upper flange plate, lower flange plate, the upper flange plate of steel beam is equipped with multiple transversely arranged segmental steel, the top of steel beam is equipped with at least two rows of upper longitudinal reinforcement from top to bottom, the upper longitudinal reinforcement is arranged along the steel beam longitudinally, the upper longitudinal reinforcement is placed on the segmental steel, the first row of upper longitudinal reinforcement arranged on the steel beam is fixed with the upper flange plate by hooking steel reinforcement spot welding, the steel beam bottom is equipped with multiple beam bottom longitudinal reinforcement along steel beam longitudinally, and the beam bottom longitudinal reinforcement is respectively welded with bracket, lower flange plate.The utility model uses the segmental steel of pre-setting as the support of upper longitudinal reinforcement, ensures that the spacing of all upper steel, row distance and the height of protective layer thickness (i.e. the distance between steel beam) are unified and accurate, avoid the error that artificial binding can produce.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and in particular to a steel-concrete cantilever beam reinforcement installation structure. Background Technology

[0002] As a crucial structural component in modern architecture, the reliability of steel-concrete composite cantilever beam reinforcement installation technology directly impacts the safety, durability, and construction efficiency of the entire structure. In recent years, with the development of architectural forms towards large spans, super high-rise buildings, and complex structures, traditional cantilever beam reinforcement construction techniques have revealed numerous shortcomings.

[0003] In traditional construction, the positioning of the reinforcing bars (especially the top longitudinal bars and web bars) in cantilever beams mainly relies on manual tying and temporary supports. This is not only inefficient but also makes it difficult to accurately control the spacing, row spacing, and protective layer thickness of the reinforcing bars. The reinforcing bar cage lacks stable support before concrete pouring, making it susceptible to displacement and deformation due to personnel stepping on it, material stacking, or the impact of concrete pouring. This leads to deviations in the final finished elevation and cross-sectional dimensions of the cantilever beam, affecting structural quality. For steel-concrete composite beams, the reinforcing bars need to be intersected with steel columns and beams, resulting in dense reinforcement at joints and complex spatial relationships, making the threading and positioning of reinforcing bars even more difficult.

[0004] Patent 202320410388.7 discloses an optimized connection structure for reinforcement in ultra-large steel-concrete beams. This structure involves arranging inner web reinforcement with the same number as the outer web reinforcement on the inner side of the steel beam. The inner web reinforcement is placed on anchor bolts and welded to them. The continuous tie hooks are replaced with segmented tie hooks, which are positioned on both sides of the steel beam to connect the inner and outer web reinforcement. However, the perforated tie bar is a monolithic system; even if individual tie bars fail, the stress will quickly redistribute to adjacent tie bars. This design, however, is a series system consisting of tie bars, inner web reinforcement, welds, anchor bolts, and the steel beam. The failure of any weld point will cause the entire section of web reinforcement to lose its binding function, lacking redundancy. Furthermore, this method requires additional web reinforcement on the inner side, which can easily lead to over-reinforcement of the beam reinforcement, resulting in waste. Summary of the Invention

[0005] This utility model proposes a steel-concrete cantilever beam reinforcement installation structure, which solves the problems of difficult positioning, difficult fixing, low construction efficiency, and high quality dependence in traditional cantilever beam reinforcement installation.

[0006] The technical solution of this utility model is as follows: A steel-concrete cantilever beam reinforcement installation structure includes a steel beam, which includes a web, an upper flange, and a lower flange. The upper flange of the steel beam is provided with multiple transversely arranged segmented steel sections. The top of the steel beam is provided with at least two rows of upper longitudinal reinforcements from top to bottom. The upper longitudinal reinforcements are arranged along the longitudinal direction of the steel beam and are placed on the segmented steel sections. The first row of upper longitudinal reinforcements on the steel beam is spot-welded to the upper flange with tie bars. The bottom of the steel beam is provided with multiple bottom longitudinal reinforcements along the longitudinal direction of the steel beam. The bottom longitudinal reinforcements are welded to the corbel and the lower flange respectively.

[0007] In one embodiment, the bottom longitudinal reinforcement at the end of the cantilever beam is welded to the corbel on the column steel frame, and the bottom longitudinal reinforcement at the variable cross-section beam segment of the cantilever beam is welded to the lower flange plate using hook reinforcement.

[0008] In one embodiment, each row of the upper longitudinal bars includes multiple transversely arranged steel bars.

[0009] In one embodiment, several rows of waist ribs are symmetrically arranged on both sides of the web. The waist ribs are arranged longitudinally along the web. Tie ribs are provided between the waist ribs in the same row. The tie ribs include a first type of tie rib and a second type of tie rib. The first type of tie rib and the second type of tie rib are distributed alternately.

[0010] In one embodiment, multiple rows of stirrups are provided on both sides of the web along the longitudinal direction of the web, and the waist reinforcement is tied to the stirrups.

[0011] In one embodiment, the web is provided with a hole through which the first type of tie bar passes, the first type of tie bar passes through the hole, and its two ends are bent downward and connected to the waist bars of the same row on both sides of the web; the second type of tie bar is bent downward and anchored to the web at one end near the web, and its other end is bent downward and connected to the waist bars of the same row on both sides of the web.

[0012] In one embodiment, the steel beam is an H-shaped steel beam, and the cantilever beam has a T-shaped cross-section.

[0013] This utility model uses steel beams and segmental steel sections as the support system for the reinforcing steel skeleton, without relying on temporary supports. This avoids the displacement of reinforcing steel caused by scaffolding swaying or deformation, ensuring the overall stability of the reinforcing steel skeleton during construction. It fundamentally solves the problems of difficult positioning, difficult fixing, low construction efficiency, and high quality dependence in the traditional installation of cantilever beam reinforcing steel.

[0014] This utility model uses pre-set segmented steel as supports for the upper longitudinal reinforcement, ensuring that the spacing, row spacing, and protective layer thickness (i.e., the distance between the steel beam and the upper longitudinal reinforcement) of all upper steel bars are highly uniform and accurate, avoiding errors that may occur during manual binding.

[0015] The bottom longitudinal reinforcement of the beam is fixed by welding to the corbel or by spot welding the tie bar to the lower flange of the steel beam. This allows for very precise control of the elevation of the bottom reinforcement, thus ensuring the final formed elevation and design position of the cantilever beam.

[0016] The bending moment is greatest at the root of the cantilever end. Here, the longitudinal reinforcement at the bottom of the beam is welded to the steel corbel on the column, creating a robust rigid joint. The steel corbel directly transfers the enormous tensile force borne by the reinforcing bars to the core column steel frame, forming an efficient and reliable force transfer path and fully utilizing the high tensile strength of steel.

[0017] The tie bars between the web reinforcements are connected by a one-through-one-weld method, which ensures that the load-bearing performance of the steel beam is not affected, and also tightly locks the concrete on both sides to the steel beam web in the middle. This forms a strong shear connection key (similar to the function of a stud), which can effectively transfer the shear force between the steel and concrete interface, prevent relative slippage between the two, and ensure that the composite section is subjected to the load as a whole. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the end section of the cantilever beam of this utility model; Figure 2 This is a schematic diagram of the middle section of the cantilever beam of this utility model; In the diagram, 1. H-beam, 2. Segmental steel, 3. Top longitudinal reinforcement, 4. Bottom longitudinal reinforcement, 5. Steel bracket, 6. Tie bar, 7. Type I tie bar, 8. Stirrup, 9. Web reinforcement, 10. Hole, 101. Web, 102. Upper flange plate, 103. Lower flange plate, 11. Type II tie bar. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] like Figure 1As shown, this embodiment discloses a steel-concrete cantilever beam installation structure. The cantilever beam has a T-shaped cross-section. The installation structure includes an H-beam 1, which includes a web 101, an upper flange 102, and a lower flange 103. Several segmented steel sections 2 with appropriate cross-sectional dimensions are transversely arranged on the beam surface of the H-beam 1. The upper longitudinal reinforcement 3 of the cantilever beam is placed on the segmented steel sections 2, controlling the distance between the upper longitudinal reinforcement 3 and the H-beam 1, and transferring the weight of the beam reinforcement cage to the H-beam 1. Before the beam formwork is installed, the weight of the reinforcement cage is borne by the H-beam 1. The first row of upper longitudinal reinforcement 3 on the beam surface of the H-beam 1 is spot-welded to the upper flange 102 of the H-beam 1 using hook reinforcement 6. Multiple bottom longitudinal reinforcement 4 are provided along the longitudinal direction of the steel beam at the bottom of the H-beam 1.

[0022] In this embodiment, the bottom longitudinal reinforcement 4 located at the end of the cantilever beam is welded to the steel bracket 5 on the column steel frame.

[0023] like Figure 2 As shown, at the deformation point of the cantilever beam section, the bottom longitudinal reinforcement 4 of the beam is welded to the lower flange plate 103 using hook reinforcement 6.

[0024] In this embodiment, the web plate 101 of the H-shaped steel beam 1 is symmetrically arranged with waist reinforcement 9 on both sides. Multiple rows of stirrups 8 are provided on both sides of the web plate 101 along the longitudinal direction of the web plate. The waist reinforcement 9 is arranged longitudinally and tied to the inner side of the stirrups 8. The waist reinforcement 9 at the same level are connected by tie bars. The tie bars include first type tie bars 7 and second type tie bars 11, and the first type tie bars 7 and second type tie bars 11 are arranged alternately.

[0025] The web 101 of the H-beam 1 has a hole 10 reserved at the position of the first type of tie bar 7. The first type of tie bar 7 passes through the hole 10 and its two ends are bent downward to connect with the waist bars 9 on the same row on both sides of the web 101.

[0026] The second type of tie bar 11 has one end bent downwards and anchored to the web 101 near the web plate 101, and the other end bent downwards and connected to the web reinforcement 9 on both sides of the web plate 101. The tie bars adopt a one-through-one-weld-through method, with half of the tie bars passing through the web plate 101 and connected to the web reinforcement; the other half of the tie bars are bent downwards and anchored to the web plate 101, connecting to the web reinforcement 9 on both sides.

[0027] Before installing the cantilever beam reinforcement, the reinforcement installation in the joint area between the cantilever beam and the column is designed in detail. The longitudinal reinforcement of the cantilever beam is passed through the reserved reinforcement holes in the column steel frame, connected by weldable reinforcement connectors (sleeves), and welded to the reserved steel brackets (steel plates) to solve the beam reinforcement connection and anchorage in the beam-column joint area.

[0028] During the detailed design of the steel beam, holes 10 for tie bars 7 are reserved in the H-shaped steel beam 1. Based on the characteristic that the bottom longitudinal reinforcement 4 of the cantilever beam is fixed by spot welding with the steel beam flange plate with hook reinforcement 6, the cantilever deep beam reinforcement is installed first and then the cantilever deep beam formwork is installed.

[0029] After the steel beam is hoisted into place, a support frame for the bottom longitudinal reinforcement of the cantilever beam is erected according to the design elevation of the bottom of the cantilever beam. The bottom longitudinal reinforcement of the cantilever beam end is welded to the steel bracket (steel plate) on the flange of the frame column steel frame. The length of the steel reinforcement weld is 5d on both sides and 10d on one side. The weld thickness meets the specifications.

[0030] The bottom longitudinal reinforcement 4 of the cantilever beam in the middle section is fixed to the lower flange plate 103 of the H-shaped steel beam 1 by spot welding with hook steel bars 6, and the elevation of the bottom longitudinal reinforcement 4 is controlled.

[0031] Before tying the longitudinal reinforcement bars on the beam surface, place segmental steel sections with appropriate cross-sectional dimensions on the cantilever steel beam surface to control the distance between the longitudinal reinforcement bars and the steel beam, and transfer the weight of the beam reinforcement cage to the steel beam. Before the cantilever beam formwork is installed, the weight of the beam reinforcement cage is supported by the cantilever steel beam. When tying the longitudinal reinforcement bars on the beam surface, insert the inner and outer stirrups of the beam reinforcement bars in sequence. Spot weld the upper longitudinal reinforcement bars of the first row of beam surface to the upper flange plate of the steel beam with hook reinforcement bars. Then, adjust the beam stirrups according to the design spacing and insert and tie the beam web reinforcement bars. The hook reinforcement bars of the beam web reinforcement bars are used by threading and welding one at a time, with half of them threading through the web plate and the other half bent downwards and anchored to the web plate (the outermost reinforcement bars all thread through the web plate, and the bottom reinforcement bars should be bent upwards and anchored). The method of threading through the web plate is as follows: first bend one end of the hook reinforcement bar, and then thread the other end of the hook reinforcement bar through the reserved hole in the steel beam. Then, use a small hand-held hydraulic reinforcement bar bending machine to bend the hook reinforcement bar according to the design and specification requirements. The longitudinal reinforcement spacing of the beam is controlled by using Ф25 short steel bars. After the reinforcement of the cantilever beam is tied, the beam reinforcement protective layer spacers are installed according to the specifications.

[0032] After the reinforcing bars are tied, the steel sections are removed and reused before the concrete is poured.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A steel-concrete cantilever beam reinforcement installation structure, comprising a steel beam, wherein the steel beam includes a web, an upper flange, and a lower flange, characterized in that: The upper flange of the steel beam is provided with multiple transversely arranged segmented steel sections. The top of the steel beam is provided with at least two rows of upper longitudinal reinforcements from top to bottom. The upper longitudinal reinforcements are arranged along the longitudinal direction of the steel beam and are placed on the segmented steel sections. The first row of upper longitudinal reinforcements on the steel beam is spot-welded to the upper flange with tie bars. The bottom of the steel beam is provided with multiple bottom longitudinal reinforcements along the longitudinal direction of the steel beam. The bottom longitudinal reinforcements are welded to the corbel and the lower flange respectively.

2. The steel-concrete cantilever beam reinforcement installation structure according to claim 1, characterized in that: The bottom longitudinal reinforcement at the end of the cantilever beam is welded to the corbel on the column steel frame, and the bottom longitudinal reinforcement at the variable cross-section beam segment of the cantilever beam is welded to the lower flange plate using hook reinforcement.

3. The steel-concrete cantilever beam reinforcement installation structure according to claim 1, characterized in that: Each row of upper longitudinal bars includes multiple transversely arranged steel bars.

4. The steel-concrete cantilever beam reinforcement installation structure according to claim 1, characterized in that: Several rows of waist ribs are symmetrically arranged on both sides of the web. The waist ribs are arranged longitudinally along the web. Tie ribs are provided between the waist ribs in the same row. The tie ribs include a first type of tie rib and a second type of tie rib. The first type of tie rib and the second type of tie rib are distributed alternately.

5. The steel-concrete cantilever beam reinforcement installation structure according to claim 4, characterized in that: Multiple rows of stirrups are provided on both sides of the web along the longitudinal direction of the web, and the waist reinforcement is tied to the stirrups.

6. The steel-concrete cantilever beam reinforcement installation structure according to claim 4, characterized in that: The web is provided with holes through which the first type of tie bar passes. The first type of tie bar passes through the holes and its two ends are bent downwards and connected to the waist bars of the same row on both sides of the web. The second type of tie bar is bent downwards and anchored to the web at one end near the web, and its other end is bent downwards and connected to the waist bars of the same row on both sides of the web.

7. The steel-concrete cantilever beam reinforcement installation structure according to claim 1, characterized in that: The steel beam is an H-shaped steel beam, and the cantilever beam has a T-shaped cross-section.

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