Tensioning rod and prestressed tendon concentricity measuring device
By designing a concentricity measuring device for tension rods and prestressing tendons, and using a rotating wheel group and measuring rod to observe the positional relationship, the problem of measuring the concentricity of prestressed track slabs before tensioning construction was solved. This ensured the concentricity of the tension rods and prestressing tendons, reduced the risk of concrete cracking, and improved the structural durability.
Patent Information
- Application Number
- CN202522186401.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-16
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-10-16
AI Technical Summary
Before the tensioning construction of prestressed track slabs, the lack of efficient and reliable means to measure the concentricity of tension rods and prestressing tendons leads to non-uniform compressive stress on the anchorage concrete, which may cause the concrete to crack or split, reducing the durability of the structure.
Design a device for measuring the concentricity of tension rods and prestressing tendons, including a testing platform, a rotating wheel assembly, a measuring rod, and a reference piece. The measuring rod simulates the prestressing tendon, and the rotating wheel assembly drives the tension rod to rotate. The positional relationship between the tip of the measuring rod and the tip of the reference piece is observed to ensure the concentricity of the tension rod and the prestressing tendon.
It improves the accuracy of concentricity measurement between tension rods and prestressing tendons, reduces the risk of cracking or crushing in the concrete anchorage area, and enhances the structural durability and safety of the track slab.
Smart Images
Figure CN223580940U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of measurement, and in particular to a device for measuring the concentricity of tension rods and prestressed tendons. Background Technology
[0002] During the tensioning process of prestressed track slabs, if the tension rods and prestressing tendons are not concentric, the eccentric load will cause the anchorage concrete to bear non-uniform compressive stress, with local pressure peaks far exceeding the design values. This can lead to cracking or splitting of the concrete at the anchorage edges, and crack propagation under long-term loads, reducing structural durability. Therefore, accurately measuring and adjusting the concentricity of the tension rods and prestressing tendons before tensioning is a key process to ensure the structural integrity of the track slab. However, currently, efficient and reliable on-site testing methods are lacking. Utility Model Content
[0003] The purpose of this invention is to overcome the problem in the prior art that the concentricity of tension rods and prestressing tendons needs to be accurately measured before the tensioning construction of prestressed track slabs, and to provide a device for measuring the concentricity of tension rods and prestressing tendons.
[0004] A device for measuring the concentricity of tension rods and prestressed tendons, comprising:
[0005] Testing station;
[0006] At least two sets of rollers are arranged longitudinally at intervals, each set of rollers including two rollers arranged laterally at intervals, and the gap between the two rollers is used to place the tension rod;
[0007] A measuring rod is fixedly connected to the tension rod. The measuring rod is used to simulate prestressed tendons. The cross-section of the measuring rod is a standard circle. One end of the measuring rod is provided with a measuring rod tip, which is located at the center of the standard circle.
[0008] The reference piece has a reference tip at one end, which is positioned close to the tip of the measuring rod.
[0009] Preferably, the reference element is a needle-like structure.
[0010] Preferably, the reference component is a steel needle.
[0011] Preferably, the length direction of the steel needle is arranged along the transverse direction of the detection table, the axial direction of the measuring rod is arranged along the longitudinal direction of the detection table, and there is a gap between the tip of the measuring rod and the tip of the reference piece, the gap between the tip of the measuring rod and the tip of the reference piece being ≤2cm.
[0012] Preferably, the gap between the two rollers is smaller than the outer diameter of the tension rod.
[0013] Preferably, the tension rod is placed 3cm-5cm from the front end of the wheel assembly.
[0014] Preferably, the reference component is fixedly installed on the mounting base.
[0015] Preferably, the mounting base is a magnetic base.
[0016] Preferably, the measuring rod is detachably connected to the tension rod.
[0017] Preferably, the measuring rod is threadedly connected to the tension rod.
[0018] Preferably, the tip of the measuring rod is exposed, and the measuring rod is used to simulate prestressed tendons.
[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0020] This invention provides a device for measuring the concentricity of a tension rod and prestressing tendons. A measuring rod simulates the prestressing tendon. First, the cross-section of the measuring rod is checked to ensure it is a standard circle. Then, the measuring rod is fixed to the tension rod. By placing the tension rod on a rotating wheel assembly and rotating the assembly, the tension rod causes the measuring rod to rotate. By observing the positional relationship between the tip of the measuring rod and the tip of a reference piece, the device checks whether the cross-section of the tension rod is a standard circle, ultimately determining the concentricity of the tension rod and the prestressing tendon.
[0021] This utility model provides a device for measuring the concentricity of tension rods and prestressing tendons, which can ensure the concentricity of tension rods and prestressing tendons before tensioning, reduce the risk of cracking or crushing in the concrete anchorage area, and improve the structural durability and safety of concrete track slabs. Attached Figure Description
[0022] Figure 1 This is a front view of the tension rod and prestressed tendon concentricity measuring device described in this utility model.
[0023] Figure 2 This is a top view of the concentricity measuring device for tension rods and prestressed tendons described in this utility model.
[0024] Figure 3 for Figure 2 Enlarged view of part A in the image.
[0025] Marked in the image:
[0026] 1-Testing table, 2-Rotating wheel, 3-Tensioning rod, 4-Measuring rod, 41-Measuring rod tip, 5-Reference piece, 51-Reference piece tip, 6-Mounting base. Detailed Implementation
[0027] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.
[0028] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer" used in the description of specific embodiments of this utility model to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.
[0029] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.
[0030] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.
[0031] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.
[0032] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.
[0033] Example 1
[0034] like Figure 1 , Figure 2 As shown, a device for measuring the concentricity of tension rods and prestressed tendons includes: a testing platform 1, a rotating wheel 2, a tension rod 3, a measuring rod 4, a reference piece 5, and a mounting base 6.
[0035] The testing platform 1 has at least two sets of rotating wheels, which are arranged longitudinally at intervals along the testing platform 1. Each set of rotating wheels includes two rotating wheels 2 arranged transversely at intervals along the testing platform 1. The rotating axes of the two rotating wheels 2 are parallel to each other, and the outer diameters of the two rotating wheels 2 are the same. The gap between the two rotating wheels 2 is used to place the tension rod 3. In a preferred embodiment, the gap between the two rotating wheels 2 is slightly smaller than the outer diameter of the tension rod 3, so that the tension rod 3 will not fall between the two rotating wheels 2 when rotating.
[0036] In one or more embodiments, the testing platform 1 is equipped with two rotating wheel sets, namely a front rotating wheel set and a rear rotating wheel set. The front end of the tension rod 3 is placed in the front rotating wheel set, and the rear end of the tension rod 3 is placed in the rear rotating wheel set. In a preferred embodiment, the front end of the tension rod 3, 3-5 cm away, is placed in the front rotating wheel set. The rotating wheel 2 is manually rotated, causing the front end of the tension rod 3, 3-5 cm away, to rotate, thereby allowing the concentricity at this point to be measured. Since the front end of the tension rod 3, 3-5 cm away, will contact the anchor cavity during tensioning, the concentricity at this point can be specifically measured to reduce the risk of cracking or crushing in the concrete anchor cavity area.
[0037] The measuring rod 4 is fixedly connected to the tension rod 3. When the measuring rod 4 is rotated, the tension rod 3 will rotate synchronously. The measuring rod 4 is used to simulate prestressed tendons. The cross-section of the measuring rod 4 is a standard circle, and one end of the measuring rod 4 is provided with a measuring rod tip 41, which is located at the center of the standard circle. In a preferred embodiment, the cross-section of the foremost part of the measuring rod tip 41 should be as small as possible, forming a structure similar to a conical tip, so as to facilitate observation of the relative positional relationship between the measuring rod tip 41 and the reference tip 51.
[0038] This invention uses a measuring rod 4 with a standard circular cross-section to simulate prestressed tendons. By measuring the concentricity of the measuring rod 4 and the tension rod 3, the concentricity of the tension rod 3 and the prestressed tendons during actual construction is reflected. By setting the tip 41 of the measuring rod at the center of the standard circle, the relative positional relationship between the tip 41 of the measuring rod and the tip 51 of the reference piece can be easily observed, thereby measuring the concentricity of the tension rod 3 and the prestressed tendons.
[0039] In one or more embodiments, the measuring rod 4 is detachably connected to the tension rod 3, for example, the measuring rod 4 is threadedly connected to the tension rod 3. This facilitates the installation and removal of the tension rod 3, and allows for convenient and rapid measurement of different tension rods 3 using a standard circular measuring rod 4, ensuring consistency of screening standards and improving the efficiency and accuracy of concentricity measurement of the tension rod 3.
[0040] In one or more embodiments, the tip 41 of the measuring rod is exposed, which makes it easier to observe the relative positional relationship between the tip 41 of the measuring rod and the tip 51 of the reference piece, thereby improving the efficiency and accuracy of the concentricity measurement of the tension rod 3.
[0041] The reference element 5 has a reference tip 51 at one end, which is positioned close to the tip 41 of the measuring rod. The reference element 5 serves as a reference point during measurement; therefore, its stability must be ensured, and its position must remain unchanged during the measurement process. Therefore, in a preferred embodiment, the reference element 5 is fixedly mounted on a mounting base 6, which is a magnetic base. It utilizes electromagnetic or permanent magnet principles to adhere to a ferromagnetic surface (such as a steel plate base) for rapid positioning and fixation. The magnetic base's ability to maintain its position directly improves the reliability, efficiency, and accuracy of concentricity measurement.
[0042] like Figure 3As shown, in one or more embodiments, the reference element 5 is a needle-like structure, for example, a steel needle, which is mounted on the magnetic base. The length direction of the steel needle is arranged along the transverse direction of the detection platform 1, and the axial direction of the measuring rod 4 is arranged along the longitudinal direction of the detection platform 1. There is a certain gap between the tip 41 of the measuring rod and the tip 51 of the reference element, and the gap between the tip 41 of the measuring rod and the tip 51 of the reference element is ≤2cm, which facilitates the observation of the relative positional relationship between the tip 41 of the measuring rod and the tip 51 of the reference element, and then measures the concentricity of the tension rod 3 and the prestressing tendon.
[0043] The specific measurement method is as follows:
[0044] 1. Fix at least two of the aforementioned rotating wheel sets to the testing table 1, and fix the reference piece 5 to the mounting base 6;
[0045] 2. Fix the measuring rod 4 to the tension rod 3;
[0046] 3. Place the tension rod 3 on at least two of the roller groups. Preferably, place the front end of the tension rod 3 3cm-5cm away from the front roller group, so that the tip 41 of the measuring rod is close to the tip 51 of the reference piece.
[0047] 4. Rotate the front rotating wheel assembly to make the tension rod 3 rotate, which in turn drives the measuring rod 4 to rotate synchronously;
[0048] 5. Observe the relative positional relationship between the tip 41 of the measuring rod and the tip 51 of the reference piece.
[0049] When the relative positional relationship between the tip 41 of the measuring rod and the tip 51 of the reference piece remains unchanged during the rotation, it indicates that the tension rod 3 and the measuring rod 4 are concentrically set, that is, the concentricity of the tension rod and the prestressing tendon is good, and the test is passed.
[0050] When the relative positional relationship between the tip 41 of the measuring rod and the tip 51 of the reference piece changes during rotation, that is, when the distance between the tip 41 of the measuring rod and the tip 51 of the reference piece increases and decreases, it indicates that the tension rod 3 and the measuring rod 4 are eccentrically set, that is, the concentricity of the tension rod and the prestressing tendon is not good, and the test fails.
[0051] This utility model provides a device for measuring the concentricity of a tension rod and prestressing tendon. A measuring rod 4 simulates the prestressing tendon. First, the cross-section of the measuring rod 4 is checked to ensure it is a standard circle. Then, the measuring rod 4 is fixed to the tension rod 3. By placing the tension rod 3 on a rotating wheel assembly and rotating the assembly, the tension rod 3 causes the measuring rod 4 to rotate. By observing the positional relationship between the tip 41 of the measuring rod and the tip 51 of the reference piece, the device checks whether the cross-section of the tension rod 3 is a standard circle, ultimately determining the concentricity of the tension rod 3 and the prestressing tendon.
[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A device for measuring the concentricity of tension rods and prestressed tendons, characterized in that, include: Testing station (1); At least two roller groups are arranged longitudinally at intervals, each roller group including two rollers (2) arranged laterally at intervals, and the gap between the two rollers (2) is used to place the tension rod (3). The measuring rod (4) is fixedly connected to the tension rod (3). The measuring rod (4) is used to simulate prestressed tendons. The cross-section of the measuring rod (4) is a standard circle. One end of the measuring rod (4) is provided with a measuring rod tip (41). The measuring rod tip (41) is located at the center of the standard circle. The reference piece (5) has a reference tip (51) at one end, which is located close to the tip (41) of the measuring rod.
2. The device for measuring the concentricity of tension rods and prestressed tendons according to claim 1, characterized in that, The reference component (5) has a needle-like structure.
3. The device for measuring the concentricity of tension rods and prestressed tendons according to claim 2, characterized in that, The reference part (5) is a steel needle.
4. The device for measuring the concentricity of tension rods and prestressed tendons according to claim 3, characterized in that, The steel needle is arranged along the transverse direction of the detection table (1), and the measuring rod (4) is arranged along the longitudinal direction of the detection table (1). There is a gap between the tip (41) of the measuring rod and the tip (51) of the reference piece. The gap between the tip (41) of the measuring rod and the tip (51) of the reference piece is ≤2cm.
5. The device for measuring the concentricity of tension rods and prestressed tendons according to claim 1, characterized in that, The tension rod (3) is placed 3cm-5cm from the front end of the wheel assembly.
6. The device for measuring the concentricity of tension rods and prestressed tendons according to claim 1, characterized in that, The reference component (5) is fixedly installed on the mounting base (6).
7. The device for measuring the concentricity of tension rods and prestressed tendons according to claim 6, characterized in that, The mounting base (6) is a magnetic base.
8. A device for measuring the concentricity of tension rods and prestressed tendons according to any one of claims 1-7, characterized in that, The measuring rod (4) is detachably connected to the tension rod (3).
9. The device for measuring the concentricity of tension rods and prestressed tendons according to claim 8, characterized in that, The measuring rod (4) is threadedly connected to the tension rod (3).
10. A device for measuring the concentricity of tension rods and prestressed tendons according to claim 9, characterized in that, The tip (41) of the measuring rod is exposed.