Tensioning device for prestressed tendons

Abstract

The utility model provides a tensioning device for prestressed tendons, and belongs to the technical field of construction equipment. The device comprises a cylindrical jack, a plurality of hanging rings are arranged on the side wall of the jack in the axial direction, a displacement sensor is further arranged on the side wall of the jack, the displacement sensor and the hanging rings are oppositely arranged in the radial direction of the jack, during working, the hanging rings are located at the top of the jack, and the displacement sensor is located at the bottom of the jack. The side wall of the jack is further provided with a protection structure, and the displacement sensor is arranged in the protection structure. The technical problem that a displacement sensor on a jack is prone to being collided and damaged is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction equipment, and particularly relates to a tensioning device for prestressed tendons. Background Technique

[0002] Prestress tensioning is to apply tension in advance to a component, so that the component subjected to prestress tensioning bears compressive stress, and then causes it to undergo a certain deformation to cope with the loads received by the structure itself, including the loads of the component's own weight, wind load, snow load, earthquake load, etc. Generally, steel strands, jacks, anchor plates, and wedge grips are used for tensioning.

[0003] The tensioning jack is usually cylindrical in shape. A displacement sensor for measuring the tensioning degree is installed on one side of the jack. Specifically, as disclosed in a prestress tensioning device with the document number CN 213625248 U, the displacement sensor on the jack in this device is fixed on the side wall of the jack, and the front end of the moving shaft of the displacement sensor is fixedly connected to a fixing plate. When the jack performs tensioning, the entire jack carries the displacement sensor and moves backward relative to the concrete component. At this time, the moving shaft is pulled out from the displacement sensor, and the displacement sensor is connected to a display device to display the distance that the jack retreats.

[0004] In actual use, in order to facilitate placing the jack at the tensioning position, a lifting ring is generally fixedly connected to the side wall of the jack, which is convenient for connecting with a lifting device to adjust the position. The displacement sensor is generally arranged on one side of the lifting ring, that is, in use, the lifting ring is located at the top of the jack, and the displacement sensor is located at the side of the jack. However, the displacement sensor located at the side is prone to collide with construction structures such as formwork, especially in the structure of a vertical wall. The formwork is located on both sides of the cast component, resulting in the displacement sensor being often easily damaged.

[0005] In addition, the displacement sensor is inevitably bumped during use. The bumping is likely to cause the data cable connecting the display device to become loose, or the internal transmission module to be damaged. Once this situation occurs, the displayed data will be inaccurate, but the situation of inaccurate displayed data volume cannot be detected in time, which is likely to affect the construction quality.

[0006] Therefore, an improved technical solution is needed to address the deficiencies of the above-mentioned existing technologies. Content of the Utility Model

[0007] The purpose of the utility model is to provide a tensioning device for prestressed tendons to solve the technical problem that the displacement sensor on the jack is easily damaged by collision.

[0008] To achieve the above purpose, the tensioning device for prestressed tendons of the utility model provides the following technical solutions:

[0009] A tensioning device for prestressed tendons, comprising a jack in the shape of a cylinder. A plurality of lifting rings are arranged axially on the side wall of the jack. A displacement sensor is also provided on the side wall of the jack. The displacement sensor and the lifting ring are arranged opposite to each other along the radial direction of the jack. During operation, the lifting ring is located at the top of the jack, and the displacement sensor is located at the bottom of the jack. A protective structure is also provided on the side wall of the jack, and the displacement sensor is arranged inside the protective structure.

[0010] As a further optimized technical solution, the protective structure at least includes two relatively arranged support plates. The heights of both support plates are greater than the height of the displacement sensor. The two support plates and the side wall of the jack form a groove-shaped structure, and the displacement sensor is arranged inside the groove-shaped structure.

[0011] As a further optimized technical solution, the two support plates are symmetrically arranged along the center line of the displacement sensor.

[0012] As a further optimized technical solution, a protective bottom plate is arranged between the two support plates. The protective bottom plate is located at the bottom of the displacement sensor and is used to protect the displacement sensor from the bottom.

[0013] As a further optimized technical solution, the protective bottom plate is located at the bottom of the two support plates.

[0014] As a further optimized technical solution, the two support plates are inclined relative to the radial connection line between the lifting ring and the sensor, so that the width of the groove-shaped structure gradually increases from the end close to the jack to the end far from the jack.

[0015] As a further optimized technical solution, the width of the protective bottom plate is close to the diameter of the jack.

[0016] As a further optimized technical solution, a display structure for displaying the elongation amount is arranged on the moving shaft of the displacement sensor.

[0017] As a further optimized technical solution, the display structure is a spray coating arranged on the moving shaft of the displacement sensor, and the spray coating has scales.

[0018] As a further optimized technical solution, the display structure is a scale groove opened on the moving shaft of the displacement sensor.

[0019] Beneficial effects: In the present utility model, a displacement sensor and a lifting ring are arranged radially relative to a jack. When installing the jack, a lifting device is used to connect the lifting ring to move the jack. At this time, the displacement sensor is exactly located at the bottom of the jack, thereby reducing the probability of the displacement sensor bumping into construction structures such as formwork and effectively reducing the probability of damage to the displacement sensor. In addition, a protective structure is provided on the side wall of the jack, and the protective displacement sensor is arranged inside the protective structure, which further reduces the probability of damage to the displacement sensor, thereby ensuring the accuracy of the data displayed by the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. Among them:

[0021] Figure 1 is a schematic diagram of the overall structure of a jack according to an embodiment of the present utility model;

[0022] Figure 2 is a side view schematic diagram of a jack according to an embodiment of the present utility model.

[0023] In the figure: 1, jack; 2, lifting ring; 3, sensor; 4, protective structure; 401, support plate; 402, groove-like structure; 403, protective bottom plate; 5, display structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present utility model.

[0025] In the description of the present utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and does not require the present utility model to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. The terms "connected" and "connected" used in the present utility model should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0027] The present utility model provides a tensioning device for prestressed tendons. By changing the position of the displacement sensor and setting a protective structure for protecting the displacement sensor, the probability of damage to the displacement sensor is reduced, the service life of the jack is extended, and the construction quality is ensured.

[0028] As Figure 1 、 Figure 2 shown, the tensioning device for prestressed tendons includes a cylindrical jack 1. A plurality of lifting rings 2 are arranged axially on the side wall of the jack 1 for facilitating connection with lifting equipment. A displacement sensor 3 is also fixedly connected to the side wall of the jack 1, and the length direction of the displacement sensor 3 is parallel to the axis of the jack 1. Among them, the displacement sensor 3 and the lifting ring 2 are arranged opposite to each other along the radial direction of the jack 1. In this way, during operation, the lifting ring 2 is located at the top of the jack 1 and connected to the lifting equipment, the displacement sensor 3 is located at the bottom of the jack 1, and a protective structure 4 for protecting the displacement sensor 3 is also provided on the side wall of the jack 1, and the displacement sensor 3 is arranged inside the protective structure 4.

[0029] Specifically, the protective structure 4 at least includes two relatively arranged support plates 401. The heights of the two support plates 401 are both greater than the height of the displacement sensor 3. The two support plates 401 and the side wall of the jack 1 form a groove-like structure 402, and the displacement sensor 3 is installed in the groove-like structure 402. The two support plates 401 can effectively reduce the probability of the displacement sensor 3 being collided from the side.

[0030] Furthermore, the two support plates 401 are symmetrically arranged along the center line of the displacement sensor 3. In this way, the sizes of the two support plates 401 are the same and the structures are symmetrical, which facilitates processing and reduces the processing difficulty. And when the two support plates 401 are symmetrically arranged, the heights of the two support plates 401 are the same, so that they can act as supports for the jack 1 when the jack 1 is placed, reducing the probability of the jack 1 body being knocked.

[0031] Furthermore, in order to more comprehensively protect the displacement sensor 3, a protective bottom plate 403 is installed between the two support plates 401. The protective bottom plate 403 is located at the bottom of the displacement sensor 3 and is used to protect the displacement sensor 3 from the bottom.

[0032] Furthermore, in order to increase the contact area between the bottom of the support of the jack 1 and the support (such as the ground, a support platform, or other structures for placing the jack 1) and ensure the stability of the support, the protective bottom plate 403 is installed at the bottom of the two support plates 401. In this way, the bottom surface of the protective bottom plate 403 serves as the contact surface, which has a larger contact area compared to only the bottom surfaces of the two support plates 401, thus ensuring that the jack 1 is more stable.

[0033] Furthermore, in order to further ensure the stability of the support of the jack 1, the two support plates 401 are arranged obliquely with respect to the radial connection line between the lifting ring 2 and the displacement sensor 3, so that the width of the groove-shaped structure 402 gradually increases from the end close to the jack 1 to the end far from the jack 1. Preferably, the width of the protective bottom plate 403 is close to the diameter of the jack 1. The larger the width of the protective bottom plate 403 as the distal end width of the groove-shaped structure 402, the more stable the jack 1 can be when placed. However, when the width of the protective bottom plate 403 is greater than the diameter of the jack 1, the overall width of the protective structure 4 protrudes from the jack 1, increasing the overall volume of the jack 1 and reducing the flexibility of use, and the protective structure 4 protruding from the jack 1 is more likely to be damaged by collision. Therefore, it is sufficient to process the width of the protective bottom plate 403 to be close to the diameter of the jack 1.

[0034] Furthermore, a display structure 5 for displaying the elongation amount is provided on the surface of the moving shaft of the displacement sensor 3. In this embodiment, the display structure 5 is a spray coating provided on the moving shaft of the displacement sensor 3, and the spray coating has sprayed scales. In other embodiments, the display structure 5 is a scale groove opened on the moving shaft of the displacement sensor 3, and each scale is engraved on the moving shaft to form a groove-shaped structure, which is not likely to increase the diameter of the moving shaft and will not affect the machining accuracy of the moving shaft.

[0035] Specifically, when in use, if the displacement sensor 3 fails or the data transmission is inaccurate, the user can compare by reading the scale with the display device to timely detect the error of the displacement sensor 3, which helps to ensure the construction quality.

[0036] It can be understood that the above description is only exemplary, and the embodiments of the present application do not limit this.

[0037] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the scope of the pending claims of the present invention.

Claims

1. A tensioning device for prestressed tendons, comprising a cylindrical jack (1), a plurality of lifting rings (2) being arranged axially on the side wall of the jack (1), and a displacement sensor (3) being further arranged on the side wall of the jack (1), characterized in that: The displacement sensor (3) and the lifting ring (2) are arranged radially opposite to each other on the jack (1); when in operation, the lifting ring (2) is located at the top of the jack (1), and the displacement sensor (3) is located at the bottom of the jack (1); a protective structure (4) is also provided on the side wall of the jack (1), and the displacement sensor (3) is arranged inside the protective structure (4).

2. The prestressed tendon tensioning device according to claim 1, characterized in that: The protective structure (4) comprises at least two support plates (401) arranged opposite to each other, the height of the two support plates (401) being greater than the height of the displacement sensor (3), the two support plates (401) and the side walls of the jack (1) forming a groove-shaped structure (402), and the displacement sensor (3) being arranged in the groove-shaped structure (402).

3. The prestressed tendon tensioning device according to claim 2, characterized in that: The two support plates (401) are symmetrically arranged along the center line of the displacement sensor (3).

4. The prestressed tendon tensioning device according to claim 3, characterized in that: A protective bottom plate (403) is provided between the two support plates (401); the protective bottom plate (403) is located at the bottom of the displacement sensor (3) and is used to protect the displacement sensor (3) from the bottom.

5. The prestressed tendon tensioning device according to claim 4, characterized in that: The protective bottom plate (403) is located at the bottom of the two supporting plates (401).

6. The prestressed tendon tensioning device according to any one of claims 2 to 5, characterized in that: The two support plates (401) are arranged obliquely relative to the radial connection line between the lifting ring (2) and the displacement sensor (3), so that the width of the groove structure (402) gradually increases from the end close to the jack (1) to the end away from the jack (1).

7. The prestressed tendon tensioning device according to claim 5, characterized in that: The width of the protective bottom plate (403) is close to the diameter of the jack (1).

8. The prestressed tendon tensioning device according to any one of claims 2 to 5, characterized in that: A display structure (5) for displaying the elongation amount is arranged on the moving axis of the displacement sensor (3).

9. The prestressed tendon tensioning device according to claim 8, characterized in that: The display structure (5) is a sprayed layer arranged on the moving axis of the displacement sensor (3), and the sprayed layer has scales on it.

10. The prestressed tendon tensioning device according to claim 8, characterized in that: The display structure (5) is a scale groove provided on the moving axis of the displacement sensor (3).

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