Reinforced concrete column transversely restrained and reinforced by annular corrugated steel pipes
By combining annular corrugated steel pipes with sandwiched self-compacting concrete, the problem of insufficient bearing capacity of reinforced concrete columns was solved, achieving a highly efficient reinforcement effect, reducing construction costs and extending the structural life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2026-03-24
AI Technical Summary
The existing reinforced concrete columns have insufficient load-bearing capacity, leading to problems with the safety and durability of building structures. Traditional reinforcement methods also suffer from resource waste and construction complexity.
Using annular corrugated steel pipes as the outer steel pipes, and combining interlayer self-compacting concrete and corrugated welded sheets, an annular corrugated steel pipe transversely constrained reinforced concrete column structure is formed. The constraining effect of the corrugated steel pipes improves the compressive strength and bearing capacity of the concrete and reduces the amount of steel used.
It improves the load-bearing capacity and compressive strength of reinforced concrete columns, reduces construction costs and project costs, and extends the service life of the structure, resulting in good economic benefits and ease of construction.
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Figure CN224032251U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model is suitable for the reinforced concrete column in civil engineering main structure of industrial plant, market, fan tower drum and large power transmission tower frame etc. with high durability requirement, and the reinforced concrete column is repaired and reinforced because of too low bearing capacity, leading to that the building cannot be normally used, especially aiming at the building structure of damaged reinforced concrete structural column. BACKGROUND
[0002] The reinforced concrete column becomes the most widely used building structure at present because of its excellent pressure bearing performance, good fireproof ability, rich material source and economical and practical performance ratio. The corrugated steel pipe concrete can effectively solve the outer pipe corrosion problem of traditional steel pipe concrete, and keeps the unique mechanical performance advantage and construction convenience of steel pipe concrete, and has strong adaptability and broad application prospect in civil engineering main structure of municipal bridge, industrial plant, fan tower drum and large power transmission tower frame etc. with high durability requirement. However, the reinforced concrete column structure needs to be reinforced and maintained in various cases to ensure its normal use and structure safety. In actual engineering, the bearing capacity of the reinforced concrete column is often insufficient due to incomplete design consideration, poor construction quality, poor construction site management and other factors. The causes of insufficient bearing capacity also include that the strength of the reinforced concrete and steel is reduced due to fire. Therefore, it is necessary to design a new reinforcing method to reinforce the reinforced concrete column, and at the same time, the corrugated steel pipe can provide sufficient restraint to the internal core concrete and profile, so that the component has good mechanical properties and corrosion resistance.
[0003] There are many reinforced methods for the reinforced concrete column, and the commonly used traditional reinforcing methods include the section enlargement method, the outer steel wrapping method, the prestress method and the like. The outer steel wrapping reinforcement method is a reinforcing method in which a profile steel is wrapped around the four corners or two surfaces of the concrete column. By using this method, the outer steel and the old concrete column to be reinforced can work together, which not only can improve the compressive strength of the original concrete, but also can improve the bearing capacity of the column. The outer steel reinforcement method is generally used for ordinary flat steel pipe concrete for reinforcing concrete. Once the steel pipe yields, its restraint force will be limited to a constant value, and the restraint effect on the concrete will no longer increase. Moreover, the strength of the steel pipe is low, and finally the damage occurs due to the crushing of the concrete and the tearing of the steel pipe. For the steel pipe concrete column, thick wall steel pipe is used, which causes large amount of steel and serious waste of resources.
[0004] In summary, in engineering practice, the reinforcement problem of old reinforced concrete columns is often encountered. In order to overcome the above-mentioned deficiencies of the existing reinforcement technology, it is urgent to invent a reinforced concrete column reinforcement structure with high bearing capacity, simple construction and good economic benefit. UTILITY MODEL CONTENTS
[0005] The utility model discloses a method for constructing a high bearing capacity, simple and economic annular corrugated steel pipe transverse constraint reinforced concrete column structure.
[0006] In order to realize the above-mentioned purpose, the utility model provides a kind of annular corrugated steel pipe transverse constraint reinforced concrete column, including original reinforced concrete column, interlayer self-compacting concrete, annular corrugated steel pipe, annular leakproof pad, corrugated welding piece;Annular corrugated steel pipe surface opening rectangular corrugated pouring mouth, after interlayer self-compacting concrete hardens and consolidates, it is welded closed with corrugated welding piece;Annular leakproof pad is laid in annular corrugated steel pipe bottom when pouring concrete, it plays the role of preventing interlayer self-compacting concrete irrigation type slurry leakage, after interlayer self-compacting concrete coagulation solidification, then remove again.
[0007] Further, the annular corrugated steel pipe is reserved 20mm steel pipe construction joint at upper and lower column ends;Annular corrugated steel upper end is provided with rectangular concrete pouring port, after interlayer self-compacting concrete pouring hardens and consolidates, it is welded closed using corrugated welding piece.
[0008] Further, the corrugated welding piece size is same with the annular corrugated steel pipe notch part corrugated shape and is wider than annular direction, after interlayer self-compacting concrete hardens, it is welded and installed in overlapping portion.
[0009] Further, the annular leakproof pad is two half circle hollow annular structure, and the interface overlapping portion is bolted;Annular leakproof pad vertical dimension is installed according to the height of bottom reserved construction joint, guarantees that there is no concrete slurry leakage when pouring concrete, after interlayer self-compacting concrete solidification installation, remove.
[0010] Further, the rectangular cross section column, the width of new concrete is generally same with or greater than the width of original column;For the circular cross section column, the thickness of new concrete should be evenly distributed on circumference.
[0011] Further, the annular corrugated steel pipe is composed of two groups of half circle corrugated steel pipes, and the two groups of half circle corrugated steel pipes are edge jointed.
[0012] Compared with prior art, the utility model has following several aspects of advantages:
[0013] (1) the utility model uses corrugated steel pipe as outer steel pipe, due to the existence of corrugation, the corrugated steel pipe in corrugated steel pipe reinforced concrete does not directly bear vertical load, mainly plays the role of constraint core concrete.Its working principle is consistent with steel pipe constraint concrete, so thin steel plate can obtain excellent mechanical properties.Compared with steel pipe concrete, a large amount of steel can be saved, thereby reducing 20% to 30% of construction cost.
[0014] (2) Through the constraint effect of the corrugated steel pipe, the compressive strength and other mechanical properties of the sandwich concrete in the steel pipe are improved, the mechanical defects of the sandwich concrete are effectively compensated, the adverse effects caused by the sandwich concrete are reduced, the load bearing performance of the column is enhanced, and the service life of the column is relatively prolonged.
[0015] (3) After cold bending forming, the out-of-plane stiffness and steel strength of the annular corrugated steel pipe are greatly improved, so that the annular corrugated steel pipe has high local stability and lateral bearing capacity, the wall of the annular corrugated steel pipe is thin, the amount of steel is reduced, the self-weight of the structure is reduced, and the engineering cost is reduced.
[0016] (4) The installation of the annular leak-proof pad makes the reinforced column structure not need to repeatedly install and pour the formwork on the sandwich self-compacting concrete part, and the corrugated steel pipe is directly used as a steel formwork for pouring, so that the construction steps and time are saved, and the engineering cost is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a structural schematic view of the annular corrugated steel pipe transversely restraining the reinforced concrete column.
[0018] Figure 2 It is a schematic view of the corrugated welding piece at the end of the annular corrugated steel pipe transversely restraining the reinforced concrete column.
[0019] Figure 3 It is a schematic view of the bottom annular leak-proof pad of the annular corrugated steel pipe transversely restraining the reinforced concrete column.
[0020] Figure 4 It is a schematic view of the bottom annular leak-proof pad of the annular corrugated steel pipe transversely restraining the reinforced concrete column.
[0021] In the figure: original reinforced concrete column-1, sandwich self-compacting concrete-2, annular corrugated steel pipe-3, annular leak-proof pad-4 (4-1, 4-2), corrugated welding piece-5, leak-proof pad connecting bolt opening-6. DETAILED DESCRIPTION
[0022] The specific implementation of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.
[0023] Specific implementation one: in combination with Figures 1 to 4 In this embodiment, the annular corrugated steel pipe transversely restraining the reinforced concrete column comprises an original reinforced concrete column 1, a sandwich self-compacting concrete 2, an annular corrugated steel pipe 3, an annular leak-proof pad 4, a corrugated welding piece 5, and a leak-proof pad connecting bolt opening 6. The annular leak-proof pad 4 is located at the bottom of the annular corrugated steel pipe 3, and is removed after the corrugated steel pipe concrete is coagulated and solidified.
[0024] In combination withFigure 1 The structural schematic diagram of the transverse constraint of the ring-shaped corrugated steel pipe to the reinforced concrete column shows that the original reinforced concrete column 1 has a diameter of 800 mm and a concrete grade of C25, and the column body is increased to have an outer diameter of 1000 mm after reinforcement. The outer sleeve ring-shaped corrugated steel pipe 3 is made of Q235 steel material; the size of the corrugated steel pipe is measured in advance, and ring-shaped leak-proof pads 4 are arranged at the bottom of the ring-shaped corrugated steel pipe; the junctions of the two half circular ring-shaped leak-proof pads 4 are connected by bolts; the corrugated steel pipe 3 is positioned according to the design requirements, so as to ensure that the position of the steel plate is accurate and the flatness meets the requirements; the two groups of thin-walled corrugated steel pipes are welded at the lap joints by using the welding technology; a rectangular pouring port with a diameter of 300 mm is formed at the upper end of the ring-shaped corrugated steel pipe; an insertion type vibrating rod is inserted into the interlayer self-compacting concrete 2 in advance; the vibrating sequence is four sides first and then the middle; the concrete is poured in two times; the vibrating rod is inserted fast and pulled out slowly; the interlayer self-compacting concrete 2 is sprayed; the reinforced area is finally formed; the concrete is maintained with the ring-shaped corrugated steel pipe; the bottom ring-shaped leak-proof pads 4 are removed after the concrete maintenance strength reaches 75%; and the top port of the corrugated steel pipe is welded and closed by using the corrugated welding sheet 5.
[0025] In combination Figure 2 It is illustrated in the embodiment that the end corrugated steel pipe of the ring-shaped corrugated pipe 3 is provided with a reserved hole, so as to ensure that the interlayer self-compacting concrete can be poured into the hole and the size of the hole can ensure that the vibrating rod is inserted, and the uniformity and compactness of the poured concrete are ensured.
[0026] In combination Figure 4 It is illustrated in the embodiment that the ring-shaped leak-proof pads 4 are two half circular hollow ring-shaped structures 4-1 and 4-2; the inner hollow circular size is equal to the diameter of the original reinforced concrete column 1; the outer ring diameter size is 30 mm larger than the thickness diameter of the outer side wall of the corrugated steel pipe; the two groups of circular hollow ring-shaped interface leak-proof pad connecting bolt holes 6 are connected by bolts; after the welding is completed, it is checked that the bottom is tightly sealed with the ring-shaped corrugated steel pipe; no concrete slurry leaks out during pouring; the ring-shaped leak-proof pads are removed after the interlayer self-compacting concrete 2 is hardened and solidified.
[0027] Compared with the ordinary steel pipe concrete pipe reinforcement method, the utility model has great advantages, the plane outer stiffness and the steel strength of the ring-shaped corrugated steel pipe can be obviously improved, which makes it have higher local stability and lateral bearing capacity. Therefore, the wall of the ring-shaped corrugated steel pipe is relatively thin, so that the steel consumption is reduced. In this way, the reinforced structural column has good mechanical properties and construction performance, and also has excellent economic benefits.
[0028] The inner diameter and the outer diameter of the corrugated welding sheet 5 are reasonably changed according to the reinforced structure, and the internal reinforcement is made according to the actual original reinforced concrete column 1 section size if the reinforced structure is a square column or other different section columns.
[0029] The thin steel plate is cold worked into a thin-walled corrugated steel pipe by a pipe winding machine in a factory, the annular corrugated steel pipe is hoisted and welded at an interface to be closed to ensure its closed property, and the annular corrugated steel pipe 3 is poured with a sandwich self-compacting concrete 2 to form a corrugated steel pipe reinforced concrete column. The sandwich self-compacting concrete 2 can be ordinary concrete, light aggregate concrete, recycled concrete, high-strength or high-performance concrete, or coral concrete with a strength grade of C30 to C80; the annular corrugated steel pipe 3 can be made of Q235 steel, Q345 steel, Q390 steel, or Q420 steel, or can be made of galvanized steel plate.
[0030] The sandwich self-compacting concrete 2 needs to have a higher strength grade than the internal original reinforced concrete column 1 according to the requirements of the reinforcement specification, that is, if the strength grade of the original reinforced concrete column 1 is C30, the sandwich self-compacting concrete 2 needs to be poured with high-strength concrete such as C35 or C40.
[0031] The leakage-proof pad connecting bolt hole 6 is connected with bolts according to the requirements of the reinforcement specification, for example, M5x20, M8x40, M12 expansion bolts, and the like, which meet the strength requirements and the structural requirements.
Claims
1. A reinforced concrete column reinforced with transverse restraint by annular corrugated steel pipe, characterized in that: It includes the original reinforced concrete column (1), the interlayer self-compacting concrete (2), the annular corrugated steel pipe (3), the annular anti-leakage pad (4), the corrugated welded sheet (5), and the anti-leakage pad connecting bolt hole (6); the annular anti-leakage pad (4) is placed at the bottom of the annular corrugated steel pipe (3) when pouring concrete, and is removed after the interlayer self-compacting concrete (2) has solidified.
2. A reinforced concrete column reinforced with transverse restraint by annular corrugated steel pipe according to claim 1, characterized in that: The annular corrugated steel pipe (3) has a 20mm steel pipe construction joint reserved at the upper and lower column ends; the lower construction joint is sealed firmly with an annular anti-leakage pad (4) when the interlayer self-compacting concrete (2) is poured.
3. A reinforced concrete column reinforced with transverse restraint by annular corrugated steel pipe according to claim 1, characterized in that: The upper end of the annular corrugated steel pipe (3) has a rectangular concrete injection port. After the interlayer self-compacting concrete (2) solidifies, it is welded and sealed using a corrugated welding piece (5).
4. A reinforced concrete column reinforced with transverse restraint by annular corrugated steel pipe according to claim 3, characterized in that: The size of the corrugated welded sheet (5) is consistent with the corrugated shape at the notch of the annular corrugated steel pipe (3); and the size of the corrugated welded sheet (5) is wider in the horizontal circumferential direction than the notch of the annular corrugated steel pipe (3), and the widened part is welded closed.
5. A reinforced concrete column reinforced with transverse restraint by annular corrugated steel pipe according to claim 2, characterized in that: The aforementioned annular leak-proof pad (4) is a two-half-circular hollow annular structure, and the overlapping part of the two sets of circular hollow annular interfaces is connected by bolts.
6. A reinforced concrete column reinforced with transverse restraint by annular corrugated steel pipe according to claim 2, characterized in that: The height of the annular anti-leakage pad (4) is the height of the bottom structural joint of the annular corrugated steel pipe (3). After the anti-leakage pad is connected to the bolt hole (6), check that the bottom is firmly sealed with the annular corrugated steel pipe (3) and that no concrete slurry leaks out after pouring. After the interlayer self-compacting concrete (2) has solidified, remove the annular anti-leakage pad.
7. A reinforced concrete column reinforced with transverse restraint by annular corrugated steel pipe according to claim 2, characterized in that: The inner hollow circle of the annular anti-leakage pad (4) is the same as the diameter of the original reinforced concrete column (1), and the outer ring diameter is larger than the outer wall thickness diameter of the corrugated steel pipe.
8. A reinforced concrete column reinforced with transverse restraint by annular corrugated steel pipe according to claim 1, characterized in that: The annular corrugated steel pipe (3) consists of two sets of semi-circular corrugated steel pipes, with the edges of the two sets of semi-circular corrugated steel pipes overlapped and welded together.
9. A reinforced concrete column reinforced with transverse restraint by annular corrugated steel pipe according to claim 1, characterized in that: The integration of the annular anti-leakage pad (4) and the corrugated welded sheet (5) allows the reinforced column structure to be poured directly using the corrugated steel pipe as the steel formwork without having to repeatedly install pouring templates in the self-compacting concrete interlayer.