Prefabricated T-beam pedestal roller type slope adjuster

Abstract

The present invention discloses a precast T-beam pedestal roller type slope adjuster, which includes a nut (2), a threaded rod (3), a top plate (5), and a bottom plate (6). The characteristics are as follows: The top plate (5) is pressed on the supporting steel bar (1), the supporting steel bar (1) is pressed on the bottom plate (6), the nut (2) is fixedly connected to the upper surface of the bottom plate (6), the threaded rod (3) is screwed into the nut (2), the upper surface of the threaded rod (3) abuts against the lower surface of the top plate (5), and the nuts (2) and the threaded rods (3) are respectively installed on the left and right sides of the supporting steel bar (1). The pedestal at the beam end of the present invention can freely adjust the longitudinal slope so that the bottom steel plate of the T-beam is horizontally and evenly stressed in contact with the bridge bearing. When tensioning, the beam body compresses and deforms and arches upward, which will not cause local stress at the bottom corners of the beam end to crack and break. The structure is simple and convenient to use.

Description

Technical Field

[0001] The invention belongs to the technical field of bridges, and particularly relates to a roller type slope adjuster for a precast T-beam pedestal. Background Technique

[0002] The post-tensioned prestressed concrete T-shaped beam bridge has the advantages of simple structure, clear stress, material saving, convenient erection and installation, and large spanning capacity. The precast T-beam is the key of the prestressed concrete T-shaped beam bridge. With the development of bridge construction, the industry's requirements for T-beam precast are becoming more and more strict, and the precast of T-beams is also a key project that is difficult to control. During the precast process of T-beams, the steel plate at the bottom of the T-beam plays a role in adjusting the longitudinal slope of the beam bottom to meet the requirements of the bridge longitudinal slope, so that the beam bottom fits horizontally with the bearing. Adjusting the height of the pedestal according to the longitudinal slope at the beam end of the T-beam is particularly important for the later erection of the T-beam and the horizontal fit of the T-beam with the bearing. During the tensioning process of the T-beam, the two ends of the beam body are subjected to compressive stress and arch upwards. The T-beam forms a simply supported stress state at both ends. The beam body is longitudinally compressed, and the two ends of the beam body slide towards the middle. The concrete at the bottom corner of the beam end rubs against the pedestal, bearing a large horizontal force, resulting in the cracking and chipping of the concrete at the bottom corner of both ends, affecting the construction quality of the T-beam. Summary of the Invention

[0003] The purpose of the invention is to overcome the above-mentioned shortcomings and provide a roller type slope adjuster for a precast T-beam pedestal, which can freely adjust the longitudinal slope of the beam end pedestal so that the steel plate at the bottom of the T-beam fits horizontally and is evenly stressed with the bridge bearing. When tensioning, the beam body compresses and deforms and arches upwards, and it will not cause cracking and chipping of the local stress at the bottom corner of the beam end. The structure is simple and the use is convenient.

[0004] The purpose of the invention and the solution of its main technical problems are achieved by adopting the following technical solutions:

[0005] A roller type slope adjuster for a precast T-beam pedestal of the invention includes a nut, a threaded rod, a top plate and a bottom plate. Its characteristics are that the top plate presses on the supporting steel rod, the supporting steel rod presses on the bottom plate, the nut is fixedly connected to the bottom plate, the threaded rod is screwed into the nut, the threaded rod abuts against the lower surface of the top plate, and nuts and threaded rods are respectively installed on the left and right sides of the supporting steel rod.

[0006] The supporting steel rod is cylindrical and can roll between the top plate and the bottom plate.

[0007] There are several nuts and threaded rods.

[0008] The top plate can adjust the slope.

[0009] Two limiting plates are respectively fixedly connected to the left and right sides of the top plate.

[0010] Compared with the prior art, the present invention has obvious beneficial effects. From the above technical solutions, it can be seen that by pressing the top plate on the supporting steel rod, the supporting steel rod on the bottom plate, fixedly connecting nuts on the bottom plate, screwing the threaded rods into the nuts, and the threaded rods abutting against the lower surface of the top plate, nuts and threaded rods are respectively installed on the left and right sides of the supporting steel rod. Before installing the T-beam steel bars, adjust the threaded rods to make the slope of the top plate adapt to the longitudinal slope of the T-beam end planned to be produced, and then start the subsequent beam manufacturing process. Before the tensioning process starts, adjust the threaded rods to disengage from the top plate, the top plate is separated from the ground, and the top plate presses on the supporting steel rod to make the supporting steel rod bear force. When the T-beam is tensioned, the supporting steel rod rolls freely on the bottom plate to release the stress at the bottom corner of the beam end. The top plate and the end of the beam body are stressed as a whole to avoid stress concentration at the corners, so as to achieve the purpose of preventing the concrete at the bottom corner of the beam end from cracking and breaking. When the length of the precast T-beam changes and the support line of the embedded steel plate of the T-beam is not at the center of the slope adjuster, adjust the position of the supporting steel rod along the direction of the top plate to correspond to the center to adapt to different beam length conditions. In short, the longitudinal slope of the beam end pedestal of the present invention can be freely adjusted so that the bottom steel plate of the T-beam is horizontally attached to the bridge bearing and evenly stressed. When the beam body is compressed and deformed and arched during tensioning, it will not cause local stress at the bottom corner of the beam end to crack and fall off. The structure is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the present invention;

[0012] Figure 2 is a front view of the present invention;

[0013] Figure 3 is a right view of the present invention,

[0014] Figure 4 is a schematic structural diagram of the supporting steel rod, nut, threaded rod and bottom plate of the present invention;

[0015] Figure 5 is a usage state diagram of the present invention.

[0016] Reference numerals:

[0017] 1, supporting steel rod; 2, nut; 3, threaded rod; 4, limiting plate; 5, top plate; 6, bottom plate; 7, foundation; 8, ground. DETAILED DESCRIPTION OF THE INVENTION

[0018] The following will be described in detail the specific implementation manners, structures, features and functions of the present invention in conjunction with the accompanying drawings and preferred embodiments.

[0019] A roller type slope adjuster for a precast T-beam pedestal of the present invention includes a nut 2, a threaded rod 3, a top plate 5, and a bottom plate 6, and is characterized in that the top plate 5 presses on the support steel bar 1, the support steel bar 1 presses on the bottom plate 6, the nut 2 is fixedly connected to the bottom plate 6, the threaded rod 3 is screwed into the nut 2, the threaded rod 3 abuts against the bottom of the top plate 5, and the nut 2 and the threaded rod 3 are installed on both the left and right sides of the support steel bar 1 respectively.

[0020] The support steel bar 1 is cylindrical and can roll between the top plate 5 and the bottom plate 6.

[0021] There are several nuts 2 and threaded rods 3.

[0022] The top plate 5 can adjust the slope.

[0023] Two limiting plates 4 are fixedly connected to both the left and right sides of the top plate 5 respectively.

[0024] During use, refer to Figure 5 , embed the bottom plate 6 on the ground 8, screw the threaded rod 3 into the nut 2, then place the support steel bar 1, place the top plate 5 on the support steel bar 1 and the threaded rod 3, adjust the threaded rod 3 before installing the T-beam steel bars so that the slope of the top plate 5 adapts to the longitudinal slope of the planned production T-beam end, and start the subsequent beam-making process. Before the tensioning process starts, adjust the threaded rod 3 to disengage from the top plate 5, the top plate 5 is lifted off, the top plate 5 presses on the support steel bar 1, so that the support steel bar 1 is stressed. When the T-beam is tensioned, the support steel bar 1 rolls freely on the bottom plate 6, releasing the stress at the bottom corner of the beam end. The top plate 5 and the beam end are stressed as a whole, avoiding stress concentration at the corners, so as to achieve the purpose of preventing the concrete at the bottom corner of the beam end from cracking and breaking. When the length of the precast T-beam changes and the support line of the precast T-beam embedded steel plate is not at the center of the slope adjuster, adjust the position of the support steel bar 1 along the direction of the top plate 5 to correspond to the center.

[0025] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A precast T-beam pedestal roller type slope adjuster, comprising a nut (2), a threaded rod (3), a top plate (5), and a bottom plate (6), characterized in that; The top plate (5) presses on the support steel rod (1), the support steel rod (1) presses on the bottom plate (6), a connecting nut (2) is fixedly connected to the upper surface of the bottom plate (6), a threaded rod (3) is screwed into the nut (2), the upper surface of the threaded rod (3) abuts against the lower surface of the top plate (5), nuts (2) and threaded rods (3) are respectively installed on the left and right sides of the support steel rod (1), the support steel rod (1) is cylindrical and can roll between the top plate (5) and the bottom plate (6), and the support steel rod (1) freely rolls during tensioning to release the beam end stress. Two limiting plates (4) are respectively fixedly connected to the left and right sides of the top plate (5).

2. The precast T-beam pedestal roller type slope adjuster according to claim 1, characterized in that, There are several of the nuts (2) and threaded rods (3).

3. The precast T-beam pedestal roller type slope adjuster according to claim 1, characterized in that, The slope of the top plate (5) is adjustable.

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