Prefabricated box girder tensioning pedestal

Abstract

The utility model relates to the technical field of prefabricated box girder tensioning construction, in particular to a prefabricated box girder tensioning pedestal which comprises a pressing plate and an anchorage device, a pedestal body is arranged on the lower side of the pressing plate, a top sleeve is arranged on the pressing plate, a pulling plate is arranged on one side of the upper portion of the pedestal body, and a hydraulic rod is arranged between the pulling plate and the pressing plate. A sliding rail corresponding to the pulling plate is arranged on the pedestal; a mounting seat is arranged on the pulling plate, a locking device is arranged on the mounting seat, a buffer spring is arranged between the locking device and the mounting seat, and round holes for accommodating steel strands are formed in the top sleeve, the locking device and the anchorage device; the pressing plate and the pulling plate are arranged and used for arranging the top sleeve and the locking device, a plurality of steel strands can be tensioned at the same time, the construction efficiency is effectively improved, the tensioning reliability is guaranteed, meanwhile, the buffering spring is arranged, flexible tensioning is achieved, and the situation that the steel strands are damaged in the tensioning process, and the construction quality is affected is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated box girder tensioning construction, in particular to a prefabricated box girder tensioning pedestal. Background Art

[0002] Box girders for reinforced concrete structures are categorized into precast and cast-in-place. Precast box girders, when installed at a separate site, can be erected using a bridge-erecting machine after the lower portion of the structure is complete, accelerating construction progress and reducing time. Cast-in-place box girders are typically used for large, continuous bridges.

[0003] Prefabricated bridge construction can reduce construction time and production costs, leading to the increasing use of prefabricated box girders in construction projects. Prefabricated box girders are commonly used in bridges. Prefabricated box girders are prefabricated flexural members, prestressed by pre-tensioning or post-tensioning prestressed steel bars. These members are then transported to the construction site for installation.

[0004] During the production of prefabricated box girders, it is generally necessary to use a pedestal to tension prestressed steel strands. By tensioning the steel strands, pre-compressive stress is applied inside the beam, which compresses the concrete inside the beam, thereby increasing its strength and rigidity. This pre-compressive stress can offset part of the load when the beam is under load, reduce beam deformation, and improve the bearing capacity of the beam.

[0005] In the existing technology, the steel strands are generally tensioned and anchored by installing a single anchor with a jack, which is inefficient and requires the experience of the construction workers to operate. The construction reliability cannot be guaranteed, which affects the tensioning quality of the box girder. Utility Model Content

[0006] The purpose of the utility model is to solve the shortcomings in the prior art and to propose a prefabricated box beam tensioning pedestal.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A prefabricated box girder tensioning pedestal, comprising a pressing plate and an anchor, wherein a pedestal is provided on the lower side of the pressing plate, a top sleeve is provided on the pressing plate, a tension plate is provided on one side of the upper portion of the pedestal, a hydraulic rod is provided between the tension plate and the pressing plate, and a slide rail corresponding to the tension plate is provided on the pedestal;

[0009] The pull plate is provided with a mounting seat, the mounting seat is provided with a locking device, a buffer spring is provided between the locking device and the mounting seat, and the top sleeve, the locking device and the anchor are all provided with round holes for accommodating the steel strands.

[0010] Preferably, a tapered hole is provided at one end of the anchor, a slot is provided inside the tapered hole, and the tapered hole and the circular hole are provided correspondingly.

[0011] Preferably, a conical clip is provided in the conical hole, a retaining spring is provided in the retaining groove, and the retaining spring is arranged corresponding to the conical clip.

[0012] Preferably, the top sleeve is detachably connected to the pressure plate, and one end of the top sleeve protrudes and abuts against the anchor.

[0013] Preferably, the anchors are provided in multiple groups, and the top sleeves and locking devices are both provided corresponding to the anchors.

[0014] Preferably, the pressing plate is fixedly connected to the base, and the pulling plate is slidably connected to the base via a slide rail.

[0015] The beneficial effects of the utility model are:

[0016] Compared with the existing technology, the utility model is provided with a pressure plate and a pulling plate, which are used to set the top sleeve and the locking device, and can tension multiple steel strands at the same time, effectively improving construction efficiency and ensuring tensioning reliability. At the same time, a buffer spring is configured for flexible tensioning to avoid damage to the steel strands during the tensioning process, which affects the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a first-perspective three-dimensional structural diagram of a prefabricated box beam tensioning pedestal proposed in the utility model;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure from a second perspective of a prefabricated box beam tensioning pedestal proposed in the utility model;

[0019] Figure 3 The present invention is a schematic diagram of an anchor structure for a prefabricated box girder tensioning pedestal proposed in the present invention.

[0020] In the figure: 1. Pressure plate; 2. Top sleeve; 3. Base; 31. Slide rail; 4. Hydraulic rod; 5. Pull plate; 6. Mounting seat; 7. Locking device; 8. Buffer spring; 9. Anchor; 91. Conical hole; 92. Conical clip; 93. Retaining spring. DETAILED DESCRIPTION

[0021] 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.

[0022] Reference Figure 1-3A prefabricated box girder tensioning pedestal includes a pressure plate 1 and an anchor 9. A tapered hole 91 is provided at one end of the anchor 9. A clamping groove is provided inside the tapered hole 91. The tapered hole 91 is arranged correspondingly to the circular hole for passing the steel strand for tensioning. A tapered clip 92 is provided in the tapered hole 91. The tapered clip 92 is adapted to the tapered hole 91. A retaining spring 93 is provided in the clamping groove. The retaining spring 93 is arranged correspondingly to the tapered clip 92 for limiting the movement of the tapered clip 92.

[0023] A pedestal 3 is provided on the lower side of the pressing plate 1, and a universal wheel is provided on the lower side of the pedestal 3 to facilitate the operator to carry and move. The pressing plate 1 is fixedly connected to the pedestal 3, and a top sleeve 2 is provided on the pressing plate 1. The top sleeve 2 and the pressing plate 1 are detachably connected to facilitate the replacement of top sleeves 2 of different specifications and sizes. One end of the top sleeve 2 protrudes and abuts against the anchor 9 to assist in tightening the anchor 9 for anchoring. A pulling plate 5 is provided on one side of the upper part of the pedestal 3, and a hydraulic rod 4 is provided between the pulling plate 5 and the pressing plate 1 to control the movement of the pulling plate 5, close to or away from the pressing plate 1. A slide rail 31 corresponding to the pulling plate 5 is provided on the pedestal 3, and the pulling plate 5 is slidably connected to the pedestal 3 through the slide rail 31 to limit the range of movement of the pulling plate 5;

[0024] A mounting seat 6 is detachably provided on the pull plate 5, and a locking device 7 is movably provided on the mounting seat 6. A buffer spring 8 is provided between the locking device 7 and the mounting seat 6. The locking device 7 and the mounting seat 6 slide axially, and the buffer spring 8 is used to press the locking device 7. The locking device 7 fixes one end of the steel strand to facilitate tensioning. Circular holes for accommodating the steel strand are provided on the top sleeve 2, the locking device 7 and the anchor 9 for passing the steel strand. There are multiple groups of anchors 9, and the top sleeve 2 and the locking device 7 are arranged corresponding to the anchor 9.

[0025] In this embodiment, when the box girder concrete reaches 90% of the design strength and is approved by the on-site engineer and supervisor, the prestressed steel tendons are tensioned;

[0026] Cut the steel strands according to the calculated length and insert them into the corresponding holes of the anchor 9. Straighten them and tie them into a bundle with galvanized iron wire. Before inserting the bundle, check the corrugated pipe channel in the box beam to ensure it is unobstructed. Use high-pressure air to spray the channel to remove dirt and cement slag.

[0027] Then, use the traction wire or manually to pass the steel strand into the hole, install the conical clip 92, the retaining spring 93 and the locking device 7, supply oil to the hydraulic rod 4, the pressure plate 1 is close to the end of the box beam, the top sleeve 2 presses the anchor 9, the control plate 5 is kept away from the pressure plate 1, and the locking device 7 pulls the steel strand. If needed, a pressure sensor can be set on the locking device 7 or the hydraulic rod 4 to detect the tensioning force, and the tensioning is staged to the control stress, and the pressure and elongation values ​​of each stage are recorded;

[0028] During the tensioning process, observe whether the steel strands are slipping. If there is any abnormality, deal with it in time. After tensioning to the controlled stress, hold the load for 2 minutes, calculate and check the elongation. After it is correct, return the oil to the hydraulic rod 4, remove the locking device 7 and other tools, carry out anchoring, and cut the excess steel strands at the end;

[0029] Carry out grouting treatment on the channel to ensure the bonding strength between the prestressed steel tendons and the concrete. Grouting is generally completed within 24 hours and 48 hours. Before grouting, compressed air should be used to remove impurities and accumulated water in the pipeline to ensure that the grouting is dense and free of voids.

[0030] 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.

[0031] 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.

[0032] 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 box girder tensioning pedestal, comprising a pressure plate (1) and an anchor (9), characterized in that: A pedestal (3) is provided on the lower side of the pressing plate (1), a top sleeve (2) is provided on the pressing plate (1), a pull plate (5) is provided on one side of the upper part of the pedestal (3), a hydraulic rod (4) is provided between the pull plate (5) and the pressing plate (1), and a slide rail (31) corresponding to the pull plate (5) is provided on the pedestal (3); The pull plate (5) is provided with a mounting seat (6), the mounting seat (6) is provided with a locking device (7), a buffer spring (8) is provided between the locking device (7) and the mounting seat (6), and the top sleeve (2), the locking device (7) and the anchor (9) are all provided with circular holes for accommodating the steel strands.

2. The prefabricated box beam tensioning pedestal according to claim 1, characterized in that: A tapered hole (91) is provided at one end of the anchor (9), a clamping groove is provided inside the tapered hole (91), and the tapered hole (91) is arranged corresponding to the circular hole.

3. The prefabricated box beam tensioning pedestal according to claim 2, characterized in that: A conical clip (92) is provided in the conical hole (91), a clamping spring (93) is provided in the clamping groove, and the clamping spring (93) is provided corresponding to the conical clip (92).

4. The prefabricated box beam tensioning pedestal according to claim 1, characterized in that: The top sleeve (2) and the pressure plate (1) are detachably connected, and one end of the top sleeve (2) protrudes and abuts against the anchor (9).

5. The prefabricated box beam tensioning pedestal according to claim 4, characterized in that: The anchor (9) is provided in multiple groups, and the top sleeve (2) and the locking device (7) are both provided corresponding to the anchor (9).

6. The prefabricated box beam tensioning pedestal according to claim 1, characterized in that: The pressing plate (1) is fixedly connected to the pedestal (3), and the pulling plate (5) is slidably connected to the pedestal (3) via a slide rail (31).

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