Concrete beam body bottom crack outer prestress correction device

Abstract

A concrete beam body bottom crack outer prestress correction device belongs to the technical field of building structure engineering. It includes a stretching rod arranged along the height of the beam body (5) and used for applying pressure to the beam body (5), characterized in that: a plurality of correction supports (2) are arranged along the length direction of the beam body (5), the correction supports (2) are sleeved on the outer side of the beam body (5), the correction support (2) includes a bracket clamped on the bottom of the beam body (5), the stretching rod is fixed at both ends of the bracket, the stretching rods at both ends are connected with a pressing plate (10) through a stretching plate (7), the stretching plate (7) and the pressing plate (10) are located above the top plate (4), and a lifting mechanism is further arranged between the stretching plate (7) and the pressing plate (10). In the concrete beam body bottom crack outer prestress correction device, the force output by the lifting mechanism is transmitted to the gap of the beam body through the correction support, a large and stable correction tension can be applied to the beam body, and the reliability of the correction process is improved.

Description

Technical Field

[0001] An external prestressing correction device for bottom cracks in concrete beams belongs to the field of building structure engineering technology. Background Technology

[0002] Concrete beams are core load-bearing components of building structures, belonging to the field of building structural engineering technology. Cracks are one of the most common quality problems in concrete beams. The causes of cracks are generally concrete shrinkage, insufficient reinforcement, or improper prestressing. Cracks are not only aesthetic defects but can also lead to decreased structural durability, reduced design load-bearing capacity, and even compromise structural safety. Traditional methods for addressing beam cracks involve bonding carbon fiber cloth and pressure grouting. However, these methods only fill the bottom cracks and cannot control their continued expansion, thus failing to fundamentally solve the problem of beam cracking.

[0003] In the prior art, there are also some solutions for dealing with cracks in beams, such as the technical solution described in Chinese utility model patent application number 202020493571.4, application date April 3, 2020, entitled "A Reinforcement Device for the Web of a Concrete Beam"; and the technical solution described in Chinese utility model patent application number 202223092913.X, application date November 22, 2022, entitled "A Shear-Reinforced Structure for a T-Beam".

[0004] However, the aforementioned methods often apply pressure directly to the beam through nuts and reinforcing bars when reinforcing it. This method is practically ineffective at applying sufficient tensile force directly to the beam through nuts, and the tensile force is prone to instability when applied separately through nuts. Furthermore, existing technologies require drilling holes in the beam for repairs, further damaging it. Therefore, the applicant of this application seeks to design a completely new technical solution to fundamentally solve the problem of repairing beam cracks. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a prestressed correction device for bottom cracks in concrete beams that transmits the force output by the lifting mechanism to the gaps in the beam through a correction bracket, can apply a sufficiently large and stable correction force to the beam, and improves the reliability of the correction process.

[0006] The technical solution adopted by this utility model to solve its technical problem is: the prestressed correction device for bottom cracks in concrete beams includes tension rods arranged along the height of the beam for applying pressure to the beam. The device is characterized by including multiple correction brackets arranged along the length of the beam. The correction brackets are fitted on the outside of the beam. The correction brackets include brackets that are clamped to the bottom of the beam. The tension rods are fixed at both ends of the brackets. The tension rods at both ends are connected to the pressure plate through a tension plate. The tension plate and the pressure plate are located above the top plate. A lifting mechanism is also provided between the tension plate and the pressure plate.

[0007] Preferably, the bracket includes a set of angle steels arranged opposite each other, and a connecting plate connecting the two angle steels, with the tension rod vertically fixed to the outer end face of the two angle steels.

[0008] Preferably, the tension rod is a screw fixed at both ends of the bracket. The screws at both ends pass through both sides of the tension plate, and tension nuts for limiting the tension plate are threaded onto the screws at both ends. The tension nuts are located at the upper part of the tension plate.

[0009] Preferably, pressure plate nuts for limiting the pressure plate are threaded onto the screws at both ends, and the pressure plate nuts are located on the upper part of the pressure plate.

[0010] Preferably, the lifting mechanism is a jack located between the tension plate and the pressure plate.

[0011] Preferably, through holes are provided on both sides of the top plate of the beam for the tension rod to pass through.

[0012] Compared with the prior art, the beneficial effects of this utility model are: In the prestressed correction device for bottom cracks in concrete beams of this application, the force output by the lifting mechanism is transmitted to the crack in the beam through the correction bracket, which can apply a sufficiently large and stable correction force to the beam, thereby improving the reliability of the correction process.

[0013] Holes are made in the top plate on both sides of the beam, and the straightening bracket passes through the holes in the top plate to avoid damage to the beam caused by making secondary holes in the beam. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the prestressed correction device for cracks at the bottom of a concrete beam.

[0015] Figure 2 for Figure 1 Top view.

[0016] Figure 3 This is a schematic diagram of the correction support structure for the external prestressing correction device for bottom cracks in a concrete beam.

[0017] The components include: 1. Beams and columns; 2. Correction brackets; 3. Jacks; 4. Top plate; 5. Beam body; 6. Screws; 7. Tension plates; 8. Tension nuts; 9. Pressure plate nuts; 10. Pressure plates; 11. Angle steel; 12. Connecting plates. Detailed Implementation

[0018] Figures 1-3 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-3 The present invention will be further described below.

[0019] like Figures 1-2 As shown, a prestressed correction device for bottom cracks in a concrete beam includes a correction bracket 2 fitted onto the outside of the beam 5. Multiple correction brackets 2 are arranged along the length of the beam 5 at the location where the crack appears. The two ends of the beam 5 are supported on the surfaces of the side columns 1. A top plate 4 is also provided on the surface of the beam 5, with a width greater than the width of the beam 5. The correction bracket 2 passes through the top plate 4 while being fitted onto the beam 5. A jack 3 is also provided on the upper part of the top plate 4. Tensile force is applied to the correction bracket 2 through the jack 3, and further transmitted to the beam 5 through the correction bracket 2, thereby correcting the surface cracks of the beam 5.

[0020] Combination Figure 3 The straightening bracket 2 includes a support frame, which comprises a set of oppositely arranged angle steels 11 connected together by a connecting plate 12. During installation on the beam 5, the straightening bracket 2 is secured to the bottom of the beam 5 using the support frame. A threaded rod 6 is vertically welded to the outer end face of each of the two angle steels 11, and the two threaded rods 6 are parallel to each other. The width of the support frame is greater than the width of the bottom of the beam 5.

[0021] A pressure plate 10 and a tension plate 7 are sequentially arranged directly above the bracket. Two screws 6 at both ends of the bracket pass through the pressure plate 10 and the tension plate 7, respectively. Pressure plate nuts 9 are threaded into each of the two screws 6, with the pressure plate nuts 9 located only on the upper surface of the pressure plate 10. Tension nuts 8 are also threaded into each of the two screws 6, with the tension nuts 8 located only on the upper surface of the tension plate 7.

[0022] The specific operation process and principle are as follows: When cracks appear in beam 5, a straightening bracket 2 of appropriate width is selected based on the width of beam 5 to ensure that the bracket at the bottom of the straightening bracket 2 can be secured to the bottom of beam 5. Then, the number of straightening brackets 2 required and the spacing between adjacent straightening brackets 2 are determined based on the extension length of the crack, thereby determining the position of each straightening bracket 2. After determining the position of the straightening bracket 2, the position of the screw 6 in each straightening bracket 2 is also determined, and holes are made in the corresponding positions of the top plate 4 according to the position of each screw 6.

[0023] After drilling the holes in the top plate 4, the straightening bracket 2 is installed on the beam 5. The straightening bracket 2 is installed from bottom to top at the bottom of the beam 5. Simultaneously, the bracket is secured to the bottom of the beam 5, and the screw rod 6 is passed through the corresponding hole in the top plate 4. Then, the pressure plate 10 is installed on both sides of the screw rod 6, and the pressure plate 10 is pre-fixed to the surface of the top plate 4 using the pressure plate nuts 9 on both sides. Subsequently, the tension plate 7 is installed on both sides of the screw rod 6, and tension nuts 8 are installed on the screw rod 6 on both sides.

[0024] Place jack 3 into straightening bracket 2, at which point jack 3 is positioned between pressure plate 10 and tension plate 7. Continuously drive the piston rod inside jack 3 to output power. As the piston rod continues to output power, when the top of the piston rod touches the bottom surface of tension plate 7, it lifts tension plate 7 upwards.

[0025] As the tension plate 7 is continuously lifted, under the limiting action of the tension nuts 8 at both ends, the force output by the jack 3 is transmitted to the bracket through the screws 6 on both sides, and further transmitted to the bottom of the beam 5 through the bracket. Since the jack 3 is placed on the surface of the beam 5, the piston rod of the jack 3 actually applies a squeezing force between the upper and lower surfaces of the beam 5 during the continuous output process, causing the cracks on the surface of the beam 5 to gradually close.

[0026] After the crack in beam 5 is closed, the pressure plate nut 9 is locked. At this time, the compressive force applied to the surface of beam 5 by jack 3 is maintained through pressure plate 10 and bracket.

[0027] The above-described steps are performed sequentially on each straightening bracket 2 to close the cracks on the surface of the beam 5. Then, the jack 3 is removed. Preferably, the screw 6 is cut from the top of the pressure plate nut 9, and finally, the cracks are filled with chemical grout.

[0028] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A prestressed correction device for bottom cracks in a concrete beam, comprising a tension rod arranged along the height of the beam (5) for applying pressure to the beam (5), characterized in that: The beam (5) includes multiple straightening brackets (2) arranged along its length. The straightening brackets (2) are fitted on the outside of the beam (5). The straightening brackets (2) include brackets that are clamped to the bottom of the beam (5). Tension rods are fixed at both ends of the brackets. The tension rods are connected to the pressure plate (10) through the tension plate (7). The tension plate (7) and the pressure plate (10) are located above the top plate (4). A lifting mechanism is also provided between the tension plate (7) and the pressure plate (10).

2. The prestressed correction device for bottom cracks in concrete beams according to claim 1, characterized in that: The bracket includes a set of angle steels (11) arranged opposite each other, and a connecting plate (12) connecting the two angle steels (11) on both sides. The tension rod is vertically fixed on the outer end face of the two angle steels (11).

3. The prestressed correction device for bottom cracks in concrete beams according to claim 1 or 2, characterized in that: The tension rod is a screw (6) fixed at both ends of the bracket. The screws (6) at both ends pass through both sides of the tension plate (7), and tension nuts (8) for limiting the tension plate (7) are threaded on the screws (6) at both ends. The tension nuts (8) are located on the upper part of the tension plate (7).

4. The prestressed correction device for bottom cracks in concrete beams according to claim 3, characterized in that: A pressure plate nut (9) for limiting the pressure plate (10) is threaded onto the screws (6) at both ends. The pressure plate nut (9) is located on the upper part of the pressure plate (10).

5. The prestressed correction device for bottom cracks in concrete beams according to claim 4, characterized in that: The lifting mechanism is a jack (3) located between the tension plate (7) and the pressure plate (10).

6. The prestressed correction device for bottom cracks in concrete beams according to claim 1, characterized in that: Through holes are provided on both sides of the top plate (4) at the top of the beam (5) for the tension rod to pass through.

Images