A reinforced concrete composite structure with high-strength prestress and a construction method thereof

Abstract

The present invention discloses a high-strength prestressed reinforced concrete composite structure and a construction method, comprising concrete, wherein first L-shaped steels are provided on both sides of the top of the concrete, second L-shaped steels are provided on both sides of the bottom of the concrete, a first U-shaped steel is provided in the middle of one side of the concrete, a second U-shaped steel is provided in the middle of the other side of the concrete, a through-hole groove is provided in the middle of the concrete, countersunk holes are provided on the top and bottom of the concrete, and first prestressed steel bars are passed through the countersunk holes. The prestressed reinforced concrete composite structure adopts a pre-tensioning method to perform concrete prestressing design on the concrete structure, and then performs concrete prestressing design again by a post-tensioning method. Post-tensioning prestressing is implemented on the basis of pre-tensioning prestressing, so as to ensure that the entire concrete structure has high crack resistance, high rigidity, saves materials, reduces dead weight, can reduce the vertical shear force and main tensile stress of the concrete beam, improve the stability of the compressed component, and improve the fatigue resistance of the component.

Description

Technical Field

[0001] The present invention relates to the field of reinforced concrete, and in particular to a high-strength prestressed reinforced concrete composite structure and a construction method. Background Art

[0002] To prevent premature cracking in reinforced concrete structures, high-strength steel bars and high-strength concrete are fully utilized. Before the concrete structure or component is subjected to service loads, external forces are applied to reduce the tensile stress in the component, even in concrete components that are under compressive stress. Prestressing is used to reduce or offset the tensile stress in the concrete caused by the load, thereby controlling the tensile stress in the structural component to a smaller range, or even keeping it under compression, thereby delaying the onset and development of concrete cracks and improving the component's crack resistance and stiffness. However, existing reinforced concrete composite structures have many drawbacks, including poor crack resistance and low stiffness. Cracks can still occur after prolonged use, shortening their service life. Therefore, a high-strength prestressed reinforced concrete composite structure is being proposed. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-strength prestressed reinforced concrete composite structure to address the defects of the prior art and to solve the problems raised by the above-mentioned background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-strength prestressed reinforced concrete composite structure, comprising concrete, wherein a first L-shaped steel is provided on both sides of the top of the concrete, a second L-shaped steel is provided on both sides of the bottom of the concrete, a first U-shaped steel is provided in the middle of one side of the concrete, a second U-shaped steel is provided in the middle of the other side of the concrete, a through-hole groove is provided in the middle of the concrete, countersunk holes are provided on the top and bottom of the concrete, a first prestressed steel bar is passed through between the countersunk holes, a plurality of first prestressed steel pipes are inserted through the top side of the concrete, a second prestressed steel bar is inserted through the inside of the first prestressed steel pipe, a plurality of second prestressed steel pipes are inserted through the bottom side of the concrete, a fourth prestressed steel bar is inserted through the inside of the second prestressed steel pipe, and a plurality of third prestressed steel bars are inserted through the middle of the concrete.

[0005] As a preferred technical solution of the present invention, the tops of the first U-shaped steel and the second U-shaped steel are welded to the first L-shaped steel, and the bottoms of the first U-shaped steel and the second U-shaped steel are welded to the second L-shaped steel.

[0006] As a preferred technical solution of the present invention, the first U-shaped steel and the second U-shaped steel are connected to the concrete via a third prestressed steel bar.

[0007] As a preferred technical solution of the present invention, the first L-shaped steel and the second L-shaped steel are both connected to the concrete via a first prestressed steel bar.

[0008] As a preferred technical solution of the present invention, the first L-shaped steels on both sides of the concrete top are connected through a first prestressed steel pipe, and the second L-shaped steels on both sides of the concrete bottom are connected through a second prestressed steel pipe.

[0009] As a preferred technical solution of the present invention, both ends of the first prestressed steel pipe and the second prestressed steel pipe are provided with threads, and the first prestressed steel pipe and the second prestressed steel pipe are both fixed to the concrete by nuts.

[0010] As a preferred technical solution of the present invention, the first prestressed steel bars are fixed to the concrete by first steel bar fixing members, and the third prestressed steel bars are all fixed to the concrete by second steel bar fixing members.

[0011] As a preferred technical solution of the present invention, the second prestressed steel bar is fixed to the first prestressed steel pipe through a first steel bar fixing piece, and the fourth prestressed steel bar is fixed to the second prestressed steel pipe through the first steel bar fixing piece.

[0012] A construction method for a high-strength prestressed reinforced concrete composite structure, the specific steps are as follows:

[0013] S1: First, the first L-shaped steel and the second L-shaped steel are welded to the first U-shaped steel and the second U-shaped steel;

[0014] S2: placing the steel cage between the first U-shaped steel and the second U-shaped steel, and welding a through-hole groove in the middle of the first U-shaped steel and the second U-shaped steel using steel plates;

[0015] S3: Then, the first prestressed steel pipe and the second prestressed steel pipe are passed through the steel cage transversely, and the first prestressed steel bar is passed through the steel cage longitudinally;

[0016] S4: The welded steel plate is then used to wrap the steel cage, and concrete is poured into the steel cage. When pouring concrete, a through hole for the third prestressed steel bar is reserved;

[0017] S5: When the concrete solidifies, the first prestressed steel bar, the first prestressed steel pipe, and the second prestressed steel pipe are prestressed and stretched by the equipment. When the concrete solidifies, the nut is rotated so that the first prestressed steel pipe and the second prestressed steel pipe respectively exert a force to move the first L-shaped steel and the second L-shaped steel closer to each other, thereby cutting off the excess part of the first prestressed steel bar;

[0018] S6: Then, the third prestressed steel bar is passed through the first U-shaped steel bar, the second U-shaped steel bar and the steel plate of the through-hole groove, and then the third prestressed steel bar is stretched by the prestressed stretching device, and then fixed by the second steel bar fixing member;

[0019] S7: Pass the second prestressed steel bar through the first prestressed steel pipe, pass the fourth prestressed steel bar through the second prestressed steel pipe, then stretch the second and fourth prestressed steel bars through the prestressed stretching equipment, and then fix the second and fourth prestressed steel bars through the first steel bar fixing piece, and cut off the excess steel bars.

[0020] The beneficial effects of the present invention are as follows: the prestressed reinforced concrete composite structure adopts the pre-tensioning method to design the concrete prestressing of the concrete structure, and then adopts the post-tensioning method to design the concrete prestressing, and implements the post-tensioning method on the basis of the pre-tensioning method prestressing, so as to ensure that the entire concrete structure has high crack resistance, high rigidity, saves materials, reduces deadweight, can reduce the vertical shear force and main tensile stress of the concrete beam, improve the stability of the compressed component, and improve the fatigue resistance of the component. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] In the figure: concrete 1, through hole groove 2, first L-shaped steel 3, first U-shaped steel 4, countersunk hole 5, first prestressed steel bar 6, first prestressed steel pipe 7, nut 8, second prestressed steel bar 9, first steel bar fixing piece 10, second U-shaped steel 11, second L-shaped steel 12, third prestressed steel bar 13, second steel bar fixing piece 14, second prestressed steel pipe 15, fourth prestressed steel bar 16. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0024] Example: See Figure 1The present invention provides a technical solution: a high-strength prestressed reinforced concrete composite structure, comprising concrete 1, first L-shaped steel 3 is provided on both sides of the top of the concrete 1, second L-shaped steel 12 is provided on both sides of the bottom of the concrete 1, a first U-shaped steel 4 is provided in the middle of one side of the concrete 1, a second U-shaped steel 11 is provided in the middle of the other side of the concrete 1, a through hole groove 2 is provided in the middle of the concrete 1, countersunk holes 5 are provided on the top and bottom of the concrete 1, first prestressed steel bars 6 are passed through the countersunk holes 5, a plurality of first prestressed steel pipes 7 are inserted into the top side of the concrete 1, a second prestressed steel bar 9 is inserted into the inside of the first prestressed steel pipe 7, a plurality of second prestressed steel pipes 15 are inserted into the bottom side of the concrete 1, a fourth prestressed steel bar 16 is inserted into the second prestressed steel pipe 15, and a plurality of third prestressed steel bars 13 are inserted into the middle of the concrete 1.

[0025] The tops of the first U-shaped steel 4 and the second U-shaped steel 11 are welded to the first L-shaped steel 3 , and the bottoms of the first U-shaped steel 4 and the second U-shaped steel 11 are welded to the second L-shaped steel 12 .

[0026] The first U-shaped steel 4 and the second U-shaped steel 11 are connected to the concrete 1 via a third prestressed steel bar 13 .

[0027] The first L-shaped steel 3 and the second L-shaped steel 12 are connected to the concrete 1 through the first prestressed steel bar 6

[0028] Row connection.

[0029] The first L-shaped steels 3 on both sides of the top of the concrete 1 are connected via a first prestressed steel pipe 7 , and the second L-shaped steels 12 on both sides of the bottom of the concrete 1 are connected via a second prestressed steel pipe 15 .

[0030] Both ends of the first prestressed steel pipe 7 and the second prestressed steel pipe 15 are provided with threads, and the first prestressed steel pipe 7 and the second prestressed steel pipe 15 are fixed to the concrete 1 by nuts 8 .

[0031] The first prestressed steel bars 6 are fixed to the concrete 1 through the first steel bar fixing members 10 , and the third prestressed steel bars 13 are fixed to the concrete 1 through the second steel bar fixing members 14 .

[0032] The second prestressed steel bar 9 is fixed to the first prestressed steel pipe 7 through the first steel bar fixing piece 10 , and the fourth prestressed steel bar 16 is fixed to the second prestressed steel pipe 15 through the first steel bar fixing piece 10 .

[0033] A construction method for a high-strength prestressed reinforced concrete composite structure, the specific steps are as follows:

[0034] S1: First, the first L-shaped steel 3 and the second L-shaped steel 12 are welded to the first U-shaped steel 4 and the second U-shaped steel 11;

[0035] S2: The steel cage is arranged between the first U-shaped steel 4 and the second U-shaped steel 11, and a through-hole groove 2 is welded in the middle of the first U-shaped steel 4 and the second U-shaped steel 11 using steel plates;

[0036] S3: Then the first prestressed steel pipe 7 and the second prestressed steel pipe 15 are passed through the steel cage transversely, and the first prestressed steel bar 6 is passed through the steel cage longitudinally;

[0037] S4: Then, the steel cage is wrapped with welded steel plates, and concrete is poured into the steel cage. When pouring concrete, a through hole for the third prestressed steel bar 13 is reserved;

[0038] S5: When the concrete solidifies, the first prestressed steel bar 6, the first prestressed steel pipe 7, and the second prestressed steel pipe 15 are prestressed and stretched by the equipment. When the concrete solidifies, the nut 8 is rotated so that the first prestressed steel pipe 7 and the second prestressed steel pipe 15 respectively exert a force to move the first L-shaped steel 3 and the second L-shaped steel 12 closer to each other, thereby cutting off the excess part of the first prestressed steel bar 6;

[0039] S6: Then, the third prestressed steel bar 13 is passed through the first U-shaped steel 4, the second U-shaped steel 11 and the steel plate of the through-hole groove 2, and then the third prestressed steel bar 13 is stretched by the prestressed stretching equipment, and then fixed by the second steel bar fixing member 14;

[0040] S7: Pass the second prestressed steel bar 9 through the first prestressed steel pipe 7, and the fourth prestressed steel bar 16 through the second prestressed steel pipe 15, then stretch the second prestressed steel bar 9 and the fourth prestressed steel bar 16 through the prestressed stretching equipment, and then fix the second prestressed steel bar 9 and the fourth prestressed steel bar 16 through the first steel bar fixing member 10, and cut off the excess steel bar part.

[0041] The prestressed reinforced concrete composite structure adopts the pre-tensioning method to design the concrete prestressing of the concrete structure, and then adopts the post-tensioning method to design the concrete prestressing. The post-tensioning method is implemented on the basis of the pre-tensioning method to ensure that the entire concrete structure has high crack resistance, high rigidity, saves materials, reduces deadweight, can reduce the vertical shear force and principal tensile stress of the concrete beam, improve the stability of the compressed member, and improve the fatigue resistance of the member.

[0042] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A construction method for a high-strength prestressed reinforced concrete composite structure, the high-strength prestressed reinforced concrete composite structure comprising concrete (1), first L-shaped steel (3) being provided on both sides of the top of the concrete (1), second L-shaped steel (12) being provided on both sides of the bottom of the concrete (1), first U-shaped steel (4) being provided in the middle of one side of the concrete (1), second U-shaped steel (11) being provided in the middle of the other side of the concrete (1), through-hole groove (2) being provided in the middle of the concrete (1), and the top of the concrete (1) being provided with a first L-shaped steel (3). The top and bottom of the concrete (1) are provided with countersunk holes (5), a first prestressed steel bar (6) is passed through between the countersunk holes (5), a plurality of first prestressed steel pipes (7) are passed through the top side of the concrete (1), a second prestressed steel bar (9) is passed through the interior of the first prestressed steel pipe (7), a plurality of second prestressed steel pipes (15) are passed through the bottom side of the concrete (1), a fourth prestressed steel bar (16) is passed through the interior of the second prestressed steel pipe (15), and a plurality of third prestressed steel bars (13) are passed through the middle of the concrete (1); The tops of the first U-shaped steel (4) and the second U-shaped steel (11) are both welded to the first L-shaped steel (3), and the bottoms of the first U-shaped steel (4) and the second U-shaped steel (11) are both welded to the second L-shaped steel (12); The first U-shaped steel (4) and the second U-shaped steel (11) are connected to the concrete (1) via a third prestressed steel bar (13); The first L-shaped steel (3) and the second L-shaped steel (12) are both connected to the concrete (1) via a first prestressed steel bar (6); The first L-shaped steels (3) on both sides of the top of the concrete (1) are connected via a first prestressed steel pipe (7), and the second L-shaped steels (12) on both sides of the bottom of the concrete (1) are connected via a second prestressed steel pipe (15); Both ends of the first prestressed steel pipe (7) and the second prestressed steel pipe (15) are provided with threads, and the first prestressed steel pipe (7) and the second prestressed steel pipe (15) are fixed to the concrete (1) via nuts (8); The first prestressed steel bar (6) is fixed to the concrete (1) via a first steel bar fixing member (10), and the third prestressed steel bars (13) are fixed to the concrete (1) via a second steel bar fixing member (14); The second prestressed steel bar (9) is fixed to the first prestressed steel pipe (7) via a first steel bar fixing piece (10), and the fourth prestressed steel bar (16) is fixed to the second prestressed steel pipe (15) via the first steel bar fixing piece (10); Its characteristics are: The specific steps are as follows: S1: First, the first L-shaped steel (3) and the second L-shaped steel (12) are welded to the first U-shaped steel (4) and the second U-shaped steel (11); S2: arranging the steel cage between the first U-shaped steel (4) and the second U-shaped steel (11), and welding a through-hole groove (2) at the middle of the first U-shaped steel (4) and the second U-shaped steel (11) using steel plates; S3: Then, the first prestressed steel pipe (7) and the second prestressed steel pipe (15) are passed through the steel cage transversely, and the first prestressed steel bar (6) is passed through the steel cage longitudinally; S4: Then, the welded steel plate is wrapped around the steel cage, and concrete is poured into the steel cage. When pouring the concrete, a through hole for the third prestressed steel bar (13) is reserved; S5: When the concrete solidifies, the first prestressed steel bar (6), the first prestressed steel pipe (7), and the second prestressed steel pipe (15) are prestressed and stretched by the device. When the concrete solidifies, the nut (8) is rotated so that the first prestressed steel pipe (7) and the second prestressed steel pipe (15) respectively exert a force on the first L-shaped steel (3) and the second L-shaped steel (12) to move closer to each other, thereby cutting off the excess part of the first prestressed steel bar (6); S6: Then, the third prestressed steel bar (13) is passed through the first U-shaped steel (4), the second U-shaped steel (11) and the steel plate of the through-hole groove (2), and then the third prestressed steel bar (13) is stretched by a prestressed stretching device, and then fixed by a second steel bar fixing member (14); S7: The second prestressed steel bar (9) is passed through the first prestressed steel pipe (7), and the fourth prestressed steel bar (16) is passed through the second prestressed steel pipe (15). The second prestressed steel bar (9) and the fourth prestressed steel bar (16) are then stretched using a prestressed stretching device. The second prestressed steel bar (9) and the fourth prestressed steel bar (16) are then fixed using a first steel bar fixing member (10), and the excess steel bar portion is cut off.

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