Precast beam end lifting pedestal

Abstract

The utility model relates to the technical field of precast beam construction, in particular to a precast beam end lifting pedestal which comprises a pedestal body and a table top arranged on one side of the pedestal body, a bearing table is arranged on the pedestal body, a fixed cross beam is arranged on one side of the bearing table, jacks are arranged at the two ends of the fixed cross beam, a movable cross beam is arranged at one end of each jack, and the movable cross beam is connected with the bearing table. Prestressed tendons penetrate through the fixed cross beams and the movable cross beams; a lifting assembly is arranged on one side of the pedestal, a lifting plate is arranged on the upper side of the lifting assembly, the lifting assembly comprises a sliding table and a hydraulic rod, an inclined plane is arranged at the bottom of the sliding table, a slope corresponding to the sliding table is arranged on one side of the pedestal, and the sliding table is in sliding contact with the slope; the lifting plate is arranged to support the beam end, the lifting assembly is used for controlling the lifting plate to move stably to adapt to deformation in the tensioning process of the precast beam, stress is improved, meanwhile, the buffer spring is arranged, collision impact is relieved, violent impact generated after the beam end deforms is avoided, and the surface of the precast beam is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated beam construction, in particular to a prefabricated beam end liftable platform. Background Art

[0002] After the construction of prefabricated beams is completed, they need to be aligned at both ends for prestressing. Prestressing is to add tension to the components in advance so that the prestressed components are subjected to tensile stress, thereby causing them to produce certain deformations to cope with the loads borne by the structure itself.

[0003] After the tensioning is completed and the prestressed tendons are released, the beam will appear to be arched in the middle and pressed down at both ends. At this time, the contact points between the two ends of the beam and the pedestal will become concentrated force points, and a large force will be generated between each other. In addition, the ends of the beam are thin, and it is very easy to crack or break during the tensioning process, causing damage to the beam.

[0004] However, the existing pedestals are usually formed of concrete or steel structures in one piece, and the overall structure is fixed. It is impossible to make targeted adjustments when the beam is tensioned to change the stress points of the beam during the tensioning process. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a prefabricated beam end liftable platform.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A prefabricated beam end liftable pedestal comprises a pedestal and a table surface arranged on one side of the pedestal, a bearing platform being provided on the pedestal, a fixed beam being provided on one side of the bearing platform, jacks being provided at both ends of the fixed beam, a movable beam being provided at one end of the jack, and prestressed tendons passing through the fixed beam and the movable beam; a lifting assembly being provided on one side of the pedestal, a lifting plate being provided on the upper side of the lifting assembly, the lifting assembly comprising a slide and a hydraulic rod, an inclined surface being provided at the bottom of the slide, a slope corresponding to the slide being provided on one side of the pedestal, and the slide and the slope being in sliding contact with each other.

[0008] Preferably, the fixed beam is fixedly connected to the pedestal, the movable beam is slidably connected to the pedestal, the prestressed tendons are provided with anchors at the fixed beam, and one end of the prestressed tendons is fixedly connected to the movable beam.

[0009] Preferably, screws are passed through both ends of the lifting plate, and a buffer spring is provided on the lower side of the lifting plate, and the buffer spring is against the slide.

[0010] Preferably, the lifting plate is slidably connected to the screw, and the lower end of the screw is fixedly connected to the slide.

[0011] Preferably, a ball bearing is embedded on the lower side of the slide, and the ball bearing abuts against the slope surface.

[0012] Preferably, both ends of the hydraulic rod are hinged to the slide and the slope respectively, and the bottom slope of the slide is adapted to the slope.

[0013] The beneficial effects of the utility model are:

[0014] Compared with the existing technology, the utility model sets a lifting plate to support the beam end, controls the stable movement of the lifting plate through the lifting assembly, adapts to the deformation of the prefabricated beam during the tensioning process, improves the force, and at the same time sets a buffer spring to reduce the collision impact, avoid violent impact after the beam end is deformed, and protect the surface of the prefabricated beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional structural diagram of a prefabricated beam end liftable platform proposed in the utility model;

[0016] Figure 2 This is a schematic diagram of the top view of the structure of a prefabricated beam end liftable platform proposed in the utility model;

[0017] Figure 3 This is a schematic diagram of the lifting component structure of a lifting platform for the end of a prefabricated beam proposed by the utility model.

[0018] In the figure: 1. Base; 11. Load-bearing platform; 12. Slope; 2. Lifting assembly; 21. Lifting plate; 211. Screw; 212. Buffer spring; 22. Slide; 23. Hydraulic rod; 3. Table; 4. Prestressed tendons; 5. Fixed beam; 6. Jack; 7. Movable beam. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Reference Figure 1-3A prefabricated beam end liftable pedestal comprises a pedestal 1 and a table top 3 arranged on one side of the pedestal 1, the table top 3 is used for pouring and placing prefabricated beams, a bearing platform 11 is provided on the pedestal 1, a fixed beam 5 is provided on one side of the bearing platform 11, the fixed beam 5 is fixedly connected to the pedestal 1, jacks 6 are provided at both ends of the fixed beam 5, a movable beam 7 is provided at one end of the jack 6, the movable beam 7 is slidably connected to the pedestal 1, the jack 6 pushes the movable beam 7 to move, and performs tensioning work, prestressed tendons 4 are passed through the fixed beam 5 and the movable beam 7, the prestressed tendons 4 are provided with anchors at the fixed beam 5, for limiting the unidirectional movement of the prestressed tendons 4, one end of the prestressed tendons 4 is fixedly connected to the movable beam 7, so that the jack 6 can tension the prestressed tendons 4 with the help of the movable beam 7;

[0021] A lifting assembly 2 is provided on one side of the pedestal 1. A lifting plate 21 is provided on the upper side of the lifting assembly 2. The lifting plate 21 is used to support the end of the precast beam. Screws 211 are passed through both ends of the lifting plate 21. The lifting plate 21 is slidably connected to the screws 211. The lifting plate 21 is guided to move up and down by the screws 211. A buffer spring 212 is provided on the lower side of the lifting plate 21. The buffer spring 212 is sleeved on the screws 211.

[0022] The lifting assembly 2 includes a slide 22 and a hydraulic rod 23. The lower end of the screw 211 is fixedly connected to the slide 22, and the buffer spring 212 is against the slide 22. The bottom of the slide 22 is provided with an inclined surface, and one side of the base 1 is provided with a slope 12 corresponding to the slide 22. The inclined surface at the bottom of the slide 22 is adapted to the slope 12. The slide 22 moves on the slope 12 to change the height of the slide 22 while ensuring the carrying capacity of the slide 22. Balls are embedded in the lower side of the slide 22, and the balls are against the surface of the slope 12. The slide 22 and the slope 12 are in sliding contact through the balls to reduce the sliding resistance. The two ends of the hydraulic rod 23 are respectively hinged to the slide 22 and the slope 12. The hydraulic rod 23 drives the slide 22 to slide on the slope 12 to adjust the position of the slide 22.

[0023] In this embodiment, the construction personnel clean the table 3 and cut the prestressed tendons 4. The cutting length of the prestressed tendons 4 is determined by calculation. When calculating, factors such as the length of the base 1, the thickness of the anchor clamp, the length of the jack 6, the elastic retraction value, the tension elongation value and the exposed length are taken into consideration. The cutting length is strictly controlled and a cutting machine or a grinding wheel saw is used for cutting.

[0024] The prestressed tendons 4 are fixed by the fixed crossbeam 5 and the movable crossbeam 7. The initial stress is first adjusted. Then, through-type jacks are used to symmetrically tension the tendons one by one from the middle to both sides to make the stresses consistent. The tendons are tensioned as a whole with the help of jacks 6 and anchored with anchors. During this process, the fixed crossbeam 5 and the movable crossbeam 7 are always kept parallel, and the tensioning stresses of each jack 6 are the same.

[0025] Fix the mold on the table 3. Before using the template, apply enough release agent after grinding and polishing to prevent rust and facilitate demoulding. After each demoulding, immediately clean the concrete residue on the template surface and apply release agent. Pour concrete. The whole pouring process is carried out continuously. During the pouring, send a special person to check for steel bar displacement, template running, core mold floating, etc.

[0026] After the precast beam reaches a certain strength, the prestressed tendons 4 are relaxed and cut off, and the prestressed tendons produce elastic shrinkage. With the help of the bonding between the concrete and the prestressed tendons 4, pre-compressive stress is generated on the concrete, and the precast beam arches and bends.

[0027] While loosening the prestressed tendons 4, the lifting assembly 2 works to adjust the height of the lifting plate 21 to prevent the beam end from directly hitting the pedestal 1 or the table top 3. The lifting plate 21 moves, and the bottom buffer spring absorbs the impact, transferring the force points of the beam body to avoid the arching of the beam body causing the force points to be concentrated at both ends of the beam body, preventing damage to both ends of the beam body, and ensuring the strength and integrity of the beam body.

[0028] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should 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.

[0030] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

Claims

1. A prefabricated beam end liftable pedestal, comprising a pedestal (1) and a tabletop (3) arranged on one side of the pedestal (1), characterized in that: The pedestal (1) is provided with a bearing platform (11), a fixed beam (5) is provided on one side of the bearing platform (11), jacks (6) are provided at both ends of the fixed beam (5), a movable beam (7) is provided at one end of the jack (6), and prestressed tendons (4) are passed through the fixed beam (5) and the movable beam (7); A lifting assembly (2) is provided on one side of the pedestal (1), a lifting plate (21) is provided on the upper side of the lifting assembly (2), the lifting assembly (2) comprises a slide (22) and a hydraulic rod (23), a bottom of the slide (22) is provided with an inclined surface, a slope (12) corresponding to the slide (22) is provided on one side of the pedestal (1), and the slide (22) is in sliding contact with the slope (12).

2. The prefabricated beam end liftable pedestal according to claim 1, characterized in that: The fixed crossbeam (5) is fixedly connected to the pedestal (1), the movable crossbeam (7) is slidably connected to the pedestal (1), the prestressed tendon (4) is provided with an anchor at the fixed crossbeam (5), and one end of the prestressed tendon (4) is fixedly connected to the movable crossbeam (7).

3. The prefabricated beam end liftable pedestal according to claim 1, characterized in that: Screws (211) are passed through both ends of the lifting plate (21), and a buffer spring (212) is provided on the lower side of the lifting plate (21), and the buffer spring (212) is in contact with the slide (22).

4. The prefabricated beam end liftable pedestal according to claim 3, characterized in that: The lifting plate (21) is slidably connected to the screw (211), and the lower end of the screw (211) is fixedly connected to the slide (22).

5. The prefabricated beam end liftable pedestal according to claim 1, characterized in that: A ball bearing is embedded on the lower side of the slide (22), and the ball bearing abuts against the surface of the slope (12).

6. The prefabricated beam end liftable pedestal according to claim 1, characterized in that: The two ends of the hydraulic rod (23) are respectively hinged to the slide (22) and the slope (12), and the bottom slope of the slide (22) is adapted to the slope (12).

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