Concrete flexural member crack control device adaptive to high-strength steel bars

Abstract

The utility model discloses a concrete flexural member crack control device adaptive to high-strength steel bars, which relates to the technical field of building crack control, and comprises at least three protection plates, all the protection plates are spliced together to form a concrete injection cavity inside, and the concrete injection cavity is formed in the height direction of the protection plates; the four high-strength steel bars are distributed in the concrete injection cavity in a rectangular shape in the height direction of the concrete injection cavity; the square limiting frame is arranged on the outer sides of the four high-strength steel bars in a surrounding mode. The elastic inclined rods distributed in a pyramid shape are matched with the square limiting frame, the high-strength steel bars are dynamically and tightly pressed at the inner corners of the limiting frame through the extrusion acting force generated during concrete pouring, a stable stress supporting system is formed, the uncoordinated deformation stress between the steel bars and concrete is effectively counteracted, cracks are restrained from the source, and the service life of the steel bars is prolonged. And the crack control effect is obviously improved.

Description

Technical Field

[0001] This utility model relates to the field of building crack control technology, specifically a crack control device for concrete flexural members adapted to high-strength steel reinforcement. Background Technology

[0002] In the field of construction engineering, high-strength steel bars are widely used in concrete flexural members due to their excellent tensile strength and load-bearing capacity, in order to improve the span, stiffness, and durability of the structure. However, the elastic modulus of high-strength steel bars differs significantly from that of concrete, making them prone to uncoordinated deformation during the stress process of the member. Furthermore, the relatively weak tensile properties of concrete itself make the member highly susceptible to cracking during pouring and hardening, under load, or when there are changes in environmental temperature and humidity.

[0003] Existing crack control technologies mostly rely on optimizing concrete mix proportions, adding ordinary steel bars, or adopting surface protection measures. However, these methods are difficult to fundamentally solve the stress concentration problem at the interface between high-strength steel bars and concrete, and their crack control effect is limited.

[0004] Although some devices attempt to limit and fix the reinforcing bars, they lack a dynamic stress transmission mechanism. During concrete pouring and subsequent stress stages, the reinforcing bars are prone to displacement, which still cannot effectively inhibit the initiation and expansion of cracks, thereby affecting the safety and service life of the structure. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a crack control device for concrete flexural members adapted to high-strength steel reinforcement.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A crack control device for concrete flexural members adapted to high-strength steel reinforcement, comprising:

[0008] At least three protective plates are joined together to form a concrete injection cavity, which is formed along the height direction of the protective plates.

[0009] Four high-strength steel bars are rectangularly distributed inside the concrete injection cavity along the height direction of the concrete injection cavity.

[0010] A square limiting frame is set around the outside of the four high-strength steel bars, and the four high-strength steel bars are located at the inner corners of the square limiting frame;

[0011] Four elastic diagonal bars are fixed together at the top and fixed to high-strength steel bars at the bottom. The four elastic diagonal bars are distributed in a pyramid shape. In the natural state, the extension lines of the elastic diagonal bars pass through the central axis of the high-strength steel bars and the top corner of the square limiting frame in sequence.

[0012] in:

[0013] When concrete is injected into the concrete injection cavity, the concrete compresses the elastic inclined bar, causing the bottom end of the elastic inclined bar to press the high-strength steel bar tightly against the inner corner of the square limiting frame along its extension line, thereby reducing concrete cracks.

[0014] Preferably, in its natural state, the angle between the elastic diagonal bar and the high-strength steel bar is between 15° and 30°.

[0015] Preferably, the four elastic diagonal bars are of the same length, and the intersection of the top ends of the four elastic diagonal bars is located on the vertical center line of the four high-strength steel bars.

[0016] Preferably, it also includes a binding rope, which is wrapped around the high-strength steel bar and bound to the square limiting frame.

[0017] Preferably, the portion of the binding rope that contacts the high-strength steel bar is located above the bottom end of the elastic diagonal bar.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] By combining the elastic diagonal bars distributed in a pyramid shape with the square limiting frame, the high-strength steel bars are dynamically pressed tightly against the inner corner of the limiting frame by the squeezing force during concrete pouring, forming a stable stress support system. This effectively counteracts the uncoordinated deformation stress between the steel bars and the concrete, inhibits the generation of cracks from the source, and significantly improves the crack control effect. Attached Figure Description

[0020] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0021] Figure 1 A schematic diagram of a crack control device for concrete flexural members adapted to high-strength steel reinforcement.

[0022] Figure 2 A top view of a crack control device for concrete flexural members adapted to high-strength steel reinforcement.

[0023] Figure 3 This is a schematic diagram of the internal structure of a crack control device for concrete flexural members adapted to high-strength steel reinforcement.

[0024] Figure 4 for Figure 3 Enlarged view of part A in the middle.

[0025] Explanation of annotations in the image:

[0026] 1. Protective plate; 2. Concrete injection cavity; 3. High-strength steel bars; 4. Square limiting frame; 5. Elastic diagonal bar; 6. Binding rope. Detailed Implementation

[0027] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0028] like Figures 1-4 As shown, a crack control device for concrete flexural members adapted to high-strength steel reinforcement includes:

[0029] At least three protective plates 1 are assembled together to form a concrete injection cavity 2, which is formed in the height direction of the protective plates 1.

[0030] Four high-strength steel bars 3 are rectangularly distributed inside the concrete injection cavity 2 along the height direction of the concrete injection cavity 2;

[0031] A square limiting frame 4 is set around the outside of the four high-strength steel bars 3, and the four high-strength steel bars 3 are located at the inner corners of the square limiting frame 4.

[0032] Four elastic diagonal bars 5 are fixed together at the top and fixed to the high-strength steel bars 3 at the bottom. The four elastic diagonal bars 5 are distributed in a pyramid shape. In the natural state, the extension lines of the elastic diagonal bars 5 pass through the central axis of the high-strength steel bars 3 and the top corner of the square limiting frame 4 in sequence.

[0033] It also includes a binding rope 6, which is wrapped around the high-strength steel bar 3 and bound to the square limiting frame 4. The part of the binding rope 6 that contacts the high-strength steel bar 3 is located above the bottom end of the elastic diagonal bar 5.

[0034] in:

[0035] When concrete is injected into the concrete injection cavity 2, the concrete compresses the elastic inclined rod 5, causing the bottom end of the elastic inclined rod 5 to press the high-strength steel bar 3 tightly against the inner corner of the square limiting frame 4 along its extension line, so as to reduce concrete cracking.

[0036] Specifically, the protective plate 1 is assembled to form a closed concrete injection cavity 2, providing a molding space for concrete pouring. Four high-strength steel bars 3 are distributed in a rectangular pattern inside the concrete injection cavity 2. The square limiting frame 4 on the outside provides an initial positioning reference for the high-strength steel bars 3. The elastic inclined rods 5, which are distributed in a pyramid shape, converge at the top and are fixed at the bottom to the high-strength steel bars 3. In the natural state, the extension line of the elastic inclined rods 5 is precisely aligned with the central axis of the high-strength steel bars 3 and the top corner of the square limiting frame 4, forming a preset force guide.

[0037] When concrete is poured into the concrete injection cavity 2, the flowing concrete exerts a uniform lateral compressive force on the elastic inclined rod 5, forcing the elastic inclined rod 5 to undergo elastic deformation. Its bottom end generates an outward thrust along the extension line, firmly pressing the high-strength steel bar 3 into the inner corner of the square limiting frame 4, so that the high-strength steel bar 3 maintains a stable rectangular distribution state.

[0038] This dynamic compression structure can offset the deformation difference between the concrete and the high-strength steel bar during the hardening process, alleviate the stress concentration at the interface, and thus reduce the initiation and propagation of cracks from the root.

[0039] Furthermore, in its natural state, the angle between the elastic diagonal bar 5 and the high-strength steel bar 3 is between 15° and 30°;

[0040] Specifically, this angle range ensures that the elastic diagonal rod 5 has sufficient elastic deformation space and allows it to form an efficient force transmission path during concrete pouring. When the concrete injection cavity 2 is filled with concrete, the flowing concrete exerts lateral compressive force on the pyramid-shaped distributed elastic diagonal rod 5. The included angle of 15°-30° allows the bottom end of the elastic diagonal rod 5 to apply lateral pressure pointing towards the inner corner of the square limiting frame 4 along the extension direction, firmly pressing the high-strength steel bar 3 into the preset position of the square limiting frame 4. At the same time, this angle can avoid insufficient deformation and pressure transmission failure due to the included angle of the elastic diagonal rod 5 being too small, or local stress concentration and damage to the interface between the high-strength steel bar 3 and the concrete due to the included angle being too large. Finally, the deformation difference between the high-strength steel bar 3 and the concrete is offset by stable pressure transmission, inhibiting the generation of cracks.

[0041] Furthermore, the four elastic diagonal bars 5 are of the same length, and the intersection of the tops of the four elastic diagonal bars 5 is located on the vertical center line of the four high-strength steel bars 3.

[0042] Specifically, the design of the four elastic diagonal bars 5 being of the same length ensures that they form a consistent 15°-30° angle with the corresponding high-strength steel bars 3 in their natural state, providing a balanced elastic deformation basis for each elastic diagonal bar 5 and avoiding uneven force transmission due to length differences. The intersection point of the top of the elastic diagonal bars 5 is located on the vertical center line of the four high-strength steel bars 3, making the pyramid-shaped distribution of elastic diagonal bars 5 form a symmetrical force structure, ensuring that the lateral extrusion force generated during concrete injection can be evenly applied to each elastic diagonal bar 5. The symmetrically distributed elastic diagonal bars 5 synchronously convert the extrusion force into a lateral thrust pointing towards the inner corner of the square limiting frame 4, ensuring that the fastening force on the four high-strength steel bars 3 is consistent in magnitude and precise in direction, always maintaining a regular rectangular distribution. This balanced force design can prevent the high-strength steel bars 3 from shifting due to force imbalance, ensuring uniform stress distribution at the interface between them and the concrete, further offsetting the deformation differences between the two, and ensuring the stability and consistency of crack suppression effect.

[0043] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A crack control device for concrete flexural members adapted to high-strength steel reinforcement, characterized in that: include: At least three protective plates (1) are assembled together to form a concrete injection cavity (2) inside, the concrete injection cavity (2) being formed in the height direction of the protective plates (1); Four high-strength steel bars (3) are rectangularly distributed inside the concrete injection cavity (2) along the height direction of the concrete injection cavity (2); A square limiting frame (4) is set outside the four high-strength steel bars (3), and the four high-strength steel bars (3) are located at the inner corners of the square limiting frame (4); Four elastic diagonal bars (5) are fixed together at the top and fixed to the high-strength steel bars (3) at the bottom. The four elastic diagonal bars (5) are distributed in a pyramid shape. In the natural state, the extension lines of the elastic diagonal bars (5) pass through the central axis of the high-strength steel bars (3) and the top corner of the square limiting frame (4) in sequence. in: When concrete is injected into the concrete injection cavity (2), the concrete squeezes the elastic inclined bar (5), causing the bottom end of the elastic inclined bar (5) to press the high-strength steel bar (3) tightly against the inner corner of the square limiting frame (4) along its extension line, so as to reduce concrete cracks.

2. The crack control device for concrete flexural members adapted to high-strength steel reinforcement according to claim 1, characterized in that: In its natural state, the angle between the elastic diagonal bar (5) and the high-strength steel bar (3) is between 15° and 30°.

3. The crack control device for concrete flexural members adapted to high-strength steel reinforcement according to claim 2, characterized in that: The four elastic diagonal bars (5) are of the same length, and the tops of the four elastic diagonal bars (5) intersect on the vertical center line of the four high-strength steel bars (3).

4. The crack control device for concrete flexural members adapted to high-strength steel reinforcement according to claim 3, characterized in that: It also includes a binding rope (6), which is wrapped around the high-strength steel bar (3) and bound to the square limiting frame (4).

5. A crack control device for concrete flexural members adapted to high-strength steel reinforcement according to claim 4, characterized in that: The part of the binding rope (6) that contacts the high-strength steel bar (3) is located above the bottom end of the elastic diagonal bar (5).

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