Mixed reinforcement method and structure for improving corrosion resistance of concrete member

Abstract

The invention is suitable for the technical field of constructional engineering, and provides a mixed reinforcement method and structure for improving the corrosion resistance of a concrete member. A steel reinforcement framework and an FRP rib framework which are coaxially arranged from inside to outside are arranged in the concrete layer. The reinforcement cage comprises two groups of fixed inner rings which are arranged in parallel; a plurality of steel longitudinal bars are uniformly fixed between the two fixed inner rings in a penetrating manner; fixed frames are symmetrically arranged between the two fixed inner rings in a sliding manner; the fixing frame comprises a sliding rod. A plurality of arc-shaped sleeves clamped with the corresponding longitudinal steel bars are uniformly fixed on the sliding rods from top to bottom; according to the device, the steel stirrups are arranged on the outer sides of the steel longitudinal bars at equal intervals, the steel stirrups are fixedly clamped on the steel longitudinal bars through the two sets of fixing frames, the traditional mode that the steel stirrups are bound through a binding belt is replaced, the steel stirrups are prevented from being dislocated in the pouring process, and therefore the steel stirrups are prevented from being damaged. And the stability of connection between the steel longitudinal bars and the steel stirrups is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and more specifically, to a hybrid reinforcement method and structure for improving the corrosion resistance of concrete components. Background Art

[0002] Reinforced concrete columns serving in a corrosive environment will face serious steel bar corrosion problems, which will damage the bond between the steel bars and the concrete and shorten the service life of the structure. Fiber Reinforced Polymer (FRP) bars have the characteristics of corrosion resistance, high strength, and linear elasticity, and are one of the ideal materials to replace steel bars. Although FRP bar concrete columns do not have the corrosion problems caused by the rust expansion of the reinforcement, and have small residual deformation under seismic action.

[0003] However, the linear elastic FRP bars make the energy dissipation capacity and ductility of concrete columns under seismic action much smaller than those of reinforced concrete columns, and the full use of FRP bars will increase the economic cost. At the same time, the existing steel longitudinal bars and steel stirrups are connected by tying with a tie, and the operation is relatively cumbersome. Moreover, by the tying method with a tie, its stability is not high, and during the grouting process, the steel stirrups will be misaligned, affecting the connection stability between the steel stirrups and the steel longitudinal bars. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a hybrid reinforcement method and structure for improving the corrosion resistance of concrete components. By arranging each group of steel stirrups at equal intervals outside the steel longitudinal bars, and fixing and clamping each group of steel stirrups on the steel longitudinal bars through two groups of fixing frames, instead of the traditional tying method with a tie, it prevents the steel stirrups from being misaligned during the pouring process and improves the connection stability between the steel longitudinal bars and the steel stirrups.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A hybrid reinforcement structure for improving the corrosion resistance of concrete components, including a concrete layer; a steel bar skeleton and an FRP bar skeleton are coaxially arranged inside the concrete layer from the inside out; the steel bar skeleton includes two parallel fixing inner rings; a number of steel longitudinal bars are uniformly and fixedly penetrated between the two fixing inner rings; a number of plug-in blocks are uniformly fixed on the outer peripheral surface of the fixing inner ring; sliding grooves are formed on the surfaces of two opposite plug-in blocks on the same fixing inner ring; fixing frames slidably matched with the corresponding sliding grooves are symmetrically slidably arranged between the two fixing inner rings; the fixing frame includes a sliding rod slidably matched with the corresponding sliding groove; a number of arc-shaped sleeves clamped with the corresponding steel longitudinal bars are uniformly fixed on the sliding rod from top to bottom; steel stirrups adapted to the arc-shaped sleeves are sleeved on the outer peripheral surface of each steel longitudinal bar.

[0007] The present invention is further configured such that: an arc-shaped groove adapted to the steel stirrups is formed inside the arc-shaped sleeve; a card slot communicating with the arc-shaped groove is formed on the surface of the arc-shaped sleeve; and the card slot is in clamping fit with the steel longitudinal bars.

[0008] The present invention is further configured such that: jack holes are formed at both ends of the sliding rod; screw holes communicating with the corresponding sliding grooves are formed inside the corresponding sliding grooves; and fastening bolts in threaded connection with the corresponding screw holes and in plug-in fit with the corresponding jack holes are screwed in the screw holes.

[0009] The present invention is further configured such that: the FRP bar skeleton includes two groups of fixed outer rings arranged in parallel; a plurality of positioning blocks are uniformly fixed on the inner wall of the fixed outer rings; and FRP longitudinal bars are fixedly penetrated between the two opposite positioning blocks.

[0010] The present invention is further configured such that: an annular groove is formed on the surface of the fixed outer ring; a plugging ring is fixed between the ends of each group of plugging blocks on one fixed outer ring; and the plugging ring is in plug-in fit with the annular groove.

[0011] The present invention is further configured such that: a plugging groove in plug-in fit with the plugging blocks is formed between two adjacent positioning blocks; a plurality of mounting holes are formed on the surface of the plugging ring and the inner bottom surface of the annular groove; the plugging ring is fixedly installed in the annular groove through fastening screws; and a positioning groove in plug-in fit with the positioning blocks is formed between the plugging ring, the fixed inner ring and each plugging block.

[0012] The present invention is further configured such that: an FRP spiral stirrup belt is fixed between the two fixed outer rings; each FRP longitudinal bar is disposed inside the FRP spiral stirrup belt; and the FRP material used for the FRP longitudinal bars and the FRP spiral stirrup belt is made of fibers and resin.

[0013] A reinforcement method for a hybrid reinforcement structure for improving the corrosion resistance of concrete members includes the following steps:

[0014] T1. By arranging each group of steel stirrups at equal intervals outside each group of steel stirrups and sliding two fixed frames along the corresponding sliding grooves towards the direction close to the center of the fixed inner ring, the corresponding steel longitudinal bars are clamped into each group of card slots, and each group of steel stirrups is placed in the corresponding arc-shaped groove. At this time, the jack holes and the screw holes are coaxially arranged. The fastening bolts are screwed into the screw holes and inserted into the jack holes to complete the fixed installation of the fixed frames and the steel bar skeletons.

[0015] T2. Place the fixed frames and the steel bar skeletons that have been fixed coaxially into the FRP bar skeleton until the positioning blocks are inserted into the corresponding positioning grooves and the plugging ring is inserted into the annular groove. Fix the plugging ring in the annular groove through fastening screws to complete the fixed installation of the steel bar skeletons and the FRP bar skeletons.

[0016] T3. The hybrid reinforcement is completed by arranging corrosion-resistant FRP longitudinal bars and FRP spiral stirrup bands on the outside and easily corroded steel longitudinal bars and steel stirrups on the inside.

[0017] The advantages of the present invention are as follows:

[0018] 1. By arranging corrosion-resistant FRP longitudinal bars and FRP spiral stirrup bands on the outside and easily corroded steel bars on the inside, the present invention makes full use of the linear elasticity and corrosion resistance of FRP materials and the excellent energy dissipation capacity of steel bars to form a concrete column with a hybrid reinforcement of FRP longitudinal bars and steel longitudinal bars, which has good corrosion resistance and seismic toughness.

[0019] 2. By arranging each group of steel stirrups at equal intervals outside the steel longitudinal bars and fixing and clamping each group of steel stirrups on the steel longitudinal bars through two groups of fixing frames, the present invention replaces the traditional way of tying with tie wires, prevents the steel stirrups from being misaligned during pouring, and improves the connection stability between the steel longitudinal bars and the steel stirrups. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the hybrid reinforcement structure for improving the corrosion resistance of concrete members of the present invention.

[0021] Figure 2 is a schematic structural diagram of the steel bar cage of the present invention.

[0022] Figure 3 is a schematic structural diagram of the fixing frame of the present invention.

[0023] Figure 4 is a schematic structural diagram of the assembly of the steel bar cage and the fixing frame of the present invention.

[0024] Figure 5 is a schematic structural diagram of the FRP bar cage of the present invention.

[0025] Figure 6 is a schematic structural diagram of the assembly of the FRP bar cage and the steel bar cage of the present invention.

[0026] In the figure: 1. Concrete layer; 2. Steel bar cage; 3. FRP bar cage; 4. Inner fixing ring; 5. Steel longitudinal bar; 6. Insertion block; 7. Chute; 8. Fixing frame; 9. Slide bar; 10. Arc-shaped sleeve; 11. Steel stirrup; 12. Arc-shaped groove; 13. Card slot; 14. Insertion hole; 15. Screw hole; 16. Tightening bolt; 17. Outer fixing ring; 18. Positioning block; 19. FRP longitudinal bar; 20. Annular groove; 21. Insertion ring; 22. Insertion groove; 23. Installation hole; 24. FRP spiral stirrup band; 25. Positioning groove. DETAILED DESCRIPTION OF THE INVENTION

[0027] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0029] In the present invention, unless otherwise stated, the orientations such as "upper and lower" are generally in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction; similarly, for the convenience of understanding and description, "left and right" are generally in the left and right shown in the drawings; "inside and outside" refer to the inside and outside relative to the contour of each component itself, but the above orientation terms are not used to limit the present invention.

[0030] Embodiment 1. Please refer to Figure 1-6 , the present invention provides the following technical solutions:

[0031] A hybrid reinforcement structure for improving the corrosion resistance of concrete members. Specifically, it includes a concrete layer 1; inside the concrete layer 1, there is a steel bar skeleton 2 and an FRP bar skeleton 3 arranged coaxially from the inside to the outside; the steel bar skeleton 2 includes two groups of fixed inner rings 4 arranged in parallel; a number of steel longitudinal bars 5 are uniformly penetrated and fixed between the two fixed inner rings 4; a number of plug-in blocks 6 are uniformly fixed on the outer peripheral side of the fixed inner ring 4; sliding grooves 7 are formed on the surfaces of two opposite plug-in blocks 6 on the same fixed inner ring 4; two fixed brackets 8 slidably arranged symmetrically between the two fixed inner rings 4 are slidably matched with the corresponding sliding grooves 7; the fixed bracket 8 includes a sliding rod 9 slidably matched with the corresponding sliding groove 7; a number of arc-shaped sleeves 10 clamped with the corresponding steel longitudinal bars 5 are uniformly fixed on the sliding rod 9 from top to bottom; a steel stirrup 11 adapted to the arc-shaped sleeve 10 is sleeved on the outer peripheral side of each steel longitudinal bar 5.

[0032] The working principle of this Embodiment 1:

[0033] By arranging each group of steel stirrups 11 at equal intervals outside the steel longitudinal bars 5, and fixing and clamping each group of steel stirrups 11 on the steel longitudinal bars 5 through two fixed brackets 8, instead of the traditional way of tying with straps, it prevents the steel stirrups 11 from being displaced during the pouring process, and improves the connection stability between the steel longitudinal bars 5 and the steel stirrups 11.

[0034] Embodiment 2. Please refer to Figure 1-6 , this Embodiment 2 is improved as follows on the basis of Embodiment 1. Specifically, an arc-shaped groove 12 adapted to the steel stirrup 11 is formed inside the arc-shaped sleeve 10; a card slot 13 communicated with the arc-shaped groove 12 is formed on the surface of the arc-shaped sleeve 10; the card slot 13 is clamped and matched with the steel longitudinal bar 5.

[0035] Both ends of the sliding rod 9 are provided with jacks 14; screw holes 15 communicating with the corresponding sliding grooves 7 are respectively provided inside the sliding grooves 7; a fastening bolt 16 that is in plug-in fit with the corresponding jack 14 is screwed in the screw hole 15.

[0036] The FRP bar skeleton 3 includes two groups of fixed outer rings 17 arranged in parallel; a number of positioning blocks 18 are evenly fixed on the inner wall of the fixed outer ring 17; FRP longitudinal bars 19 are fixedly penetrated between the two opposite positioning blocks 18.

[0037] An annular groove 20 is formed on the surface of the fixed outer ring 17; a plugging ring 21 is fixed between the ends of each group of plugging blocks 6 on one fixed outer ring 17; the plugging ring 21 is in plug-in fit with the annular groove 20.

[0038] A plugging groove 22 that is in plug-in fit with the plugging block 6 is formed between two adjacent positioning blocks 18; a number of mounting holes 23 are respectively formed on the surface of the plugging ring 21 and the inner bottom surface of the annular groove 20; the plugging ring 21 is fixedly installed in the annular groove 20 by fastening screws; a positioning groove 25 that is in plug-in fit with the positioning block 18 is formed between the plugging ring 21, the fixed inner ring 4 and each plugging block 6.

[0039] An FRP spiral stirrup belt 24 is fixed between the two fixed outer rings 17; each FRP longitudinal bar 19 is placed inside the FRP spiral stirrup belt 24; the FRP materials used for the FRP longitudinal bars 19 and the FRP spiral stirrup belt 24 are made of fibers and resins.

[0040] The working principle of the second embodiment:

[0041] By arranging each group of steel stirrups 11 at equal intervals outside each group of steel stirrups 11 and sliding the two fixed frames 8 along the corresponding sliding grooves 7, the corresponding steel longitudinal bars 5 are clamped into each group of clamping grooves 13, and each group of steel stirrups 11 are placed in the corresponding arc grooves 12. The fastening bolts 16 are screwed into the screw holes 15 and inserted into the jacks 14 to complete the fixed installation of the fixed frame 8 and the steel bar skeleton 2; the fixed frame 8 and the steel bar skeleton 2 after being fixed are coaxially placed into the FRP bar skeleton 3, and the plugging ring 21 is fixed in the annular groove 20 by fastening screws to complete the fixed installation of the steel bar skeleton 2 and the FRP bar skeleton 3, improving the connection stability between the steel bar skeleton 2 and the FRP bar skeleton 3, and further improving the stability of the two during the subsequent pouring process.

[0042] The FRP spiral stirrup belt 24 is produced by continuous fiber winding and integrated molding, with high tensile strength and strong deformation ability. Under the action of an earthquake, it can continuously restrain the concrete at the column foot, prevent the spalling of the concrete protective layer, improve the ductility of the concrete column, prevent the buckling of the steel longitudinal bars 5 and the FRP longitudinal bars, and avoid the collapse of the concrete column.

[0043] By arranging the corrosion-resistant FRP longitudinal bars 19 and FRP spiral stirrup bands 24 on the outside, and arranging the steel longitudinal bars 5 and FRP longitudinal bars 19 that are prone to corrosion on the inside, the linear elasticity and corrosion resistance of the FRP material and the excellent energy dissipation capacity of the steel bars are fully utilized to form a concrete column with a hybrid reinforcement of FRP longitudinal bars 19 and steel longitudinal bars 5 that has good corrosion resistance and seismic toughness.

[0044] A reinforcement method for a hybrid reinforcement structure used to improve the corrosion resistance of concrete members, comprising the following steps:

[0045] T1. By arranging the groups of steel stirrups 11 at equal intervals outside the groups of steel stirrups 11, sliding two sets of fixing frames 8 along the corresponding chutes 7 towards the direction close to the center of the fixed inner ring 4, so that the corresponding steel longitudinal bars 5 are clamped into the groups of card slots 13, and each group of steel stirrups 11 is placed in the corresponding arc-shaped slots 12. At this time, the jack holes 14 and the screw holes 15 are coaxially arranged. The fastening bolts 16 are screwed into the screw holes 15 and inserted into the jack holes 14 to complete the fixed installation of the fixing frame 8 and the steel bar skeleton 2.

[0046] T2. Place the fixed fixing frame 8 and the steel bar skeleton 2 coaxially into the FRP bar skeleton 3 until the positioning blocks 18 are inserted into the corresponding positioning slots 25 and the plug-in rings 21 are inserted into the annular slots 20. Fix the plug-in rings 21 in the annular slots 20 through fastening screws to complete the fixed installation of the steel bar skeleton 2 and the FRP bar skeleton 3.

[0047] T3. By arranging the corrosion-resistant FRP longitudinal bars 19 and FRP spiral stirrup bands 24 on the outside, and arranging the steel longitudinal bars 5 and steel stirrups 11 that are prone to corrosion on the inside, the hybrid reinforcement is completed.

[0048] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0049] It should be noted that the terms used here are only for describing specific embodiments, rather than intending to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here.

[0051] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0052] The above is only the preferred implementation mode of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A hybrid reinforcement structure for improving the corrosion resistance of a concrete member, comprising a concrete layer (1); characterized in that: The concrete layer (1) is provided with a steel reinforcement skeleton (2) and an FRP reinforcement skeleton (3) coaxially arranged from the inside to the outside; The steel skeleton (2) comprises two sets of fixed inner rings (4) arranged in parallel; a plurality of steel longitudinal bars (5) are evenly penetrated and fixed between the two fixed inner rings (4); a plurality of plug-in blocks (6) are evenly fixed on the outer peripheral side of the fixed inner ring (4); a sliding groove (7) is provided on the surface of the two plug-in blocks (6) opposite to each other on the same fixed inner ring (4); a fixing frame (8) is symmetrically slidably arranged between the two fixed inner rings (4) and is slidably matched with the corresponding sliding groove (7); The fixing frame (8) comprises a sliding rod (9) which is slidably matched with the corresponding sliding groove (7); a plurality of arc sleeves (10) which are evenly fixed from top to bottom on the sliding rod (9) and are clamped with the corresponding steel longitudinal bars (5); and a steel stirrup (11) which is matched with the arc sleeve (10) is sleeved on the outer peripheral side surface of each steel longitudinal bar (5).

2. The hybrid reinforcement structure for improving the corrosion resistance of concrete components according to claim 1, characterized in that: The arc-shaped sleeve (10) is provided with an arc-shaped groove (12) adapted to the steel stirrup (11) inside; the arc-shaped sleeve (10) is provided with a clamping groove (13) connected to the arc-shaped groove (12) on its surface; and the clamping groove (13) is clamped and matched with the steel longitudinal reinforcement (5).

3. The hybrid reinforcement structure for improving the corrosion resistance of concrete components according to claim 2, characterized in that: Both ends of the slide rod (9) are provided with insertion holes (14); corresponding screw holes (15) communicating with the slide grooves (7) are provided inside the slide grooves (7); and fastening bolts (16) plug-fitting with the corresponding insertion holes (14) are screwed into the screw holes (15).

4. The hybrid reinforcement structure for improving the corrosion resistance of concrete components according to claim 3, characterized in that: The FRP reinforcement frame (3) comprises two sets of fixed outer rings (17) arranged in parallel; a plurality of positioning blocks (18) are evenly fixed on the inner wall of the fixed outer ring (17); and FRP longitudinal bars (19) are fixed and penetrated between two of the positioning blocks (18).

5. The hybrid reinforcement structure for improving the corrosion resistance of concrete components according to claim 4, characterized in that: An annular groove (20) is provided on the surface of the fixed outer ring (17); an inserting ring (21) is fixed between the ends of each group of inserting blocks (6) on the fixed outer ring (17); and the inserting ring (21) is inserted and matched with the annular groove (20).

6. The hybrid reinforcement structure for improving the corrosion resistance of concrete components according to claim 5, characterized in that: A plug-in groove (22) for plugging with the plug-in block (6) is formed between two adjacent positioning blocks (18); a plurality of mounting holes (23) are provided on the surface of the plug-in ring (21) and the inner bottom surface of the annular groove (20); the plug-in ring (21) is fixedly installed in the annular groove (20) by means of fastening screws; and a positioning groove (25) for plugging with the positioning block (18) is formed between the plug-in ring (21), the fixed inner ring (4) and each plug-in block (6).

7. The hybrid reinforcement structure for improving the corrosion resistance of concrete components according to claim 6, characterized in that: An FRP spiral stirrup band (24) is fixed between the two fixed outer rings (17); each of the FRP longitudinal bars (19) is placed inside the FRP spiral stirrup band (24); and the FRP material used for the FRP longitudinal bars (19) and the FRP spiral stirrup band (24) is made of fiber and resin.

8. The reinforcement method of a hybrid reinforcement structure for improving the corrosion resistance of a concrete member according to claim 7, characterized in that: The following steps are involved: T1, by placing each group of steel stirrups (11) at equal intervals outside each group of steel stirrups (11), sliding the two groups of fixing frames (8) along the corresponding sliding grooves (7) toward the center of the fixed inner ring (4), so that the corresponding steel longitudinal bars (5) are snapped into each group of snap grooves (13), and each group of steel stirrups (11) is placed in the corresponding arc groove (12). At this time, the insertion hole (14) and the screw hole (15) are coaxially arranged, and the fixing bolts (16) are screwed into the screw holes (15) and inserted into the insertion holes (14), thereby completing the fixing and installation of the fixing frame (8) and the steel skeleton (2); T2, placing the fixed fixing frame (8) and the steel bar skeleton (2) coaxially into the FRP steel bar skeleton (3), inserting the positioning block (18) into the corresponding positioning groove (25), inserting the plug-in ring (21) into the annular groove (20), and fixing the plug-in ring (21) in the annular groove (20) by tightening screws, thereby completing the fixed installation of the steel bar skeleton (2) and the FRP steel bar skeleton (3); T3. Mixed reinforcement is achieved by arranging corrosion-resistant FRP longitudinal bars (19) and FRP spiral stirrups (24) on the outside and arranging corrosion-prone steel longitudinal bars (5) and steel stirrups (11) on the inside.

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