A cable guide conduit measurement automatic positioning fixture and method of use thereof

Abstract

The application discloses a kind of cable conduit measurement automatic positioning fixtures and its using method, it is related to bridge construction technical field, including: fixture body;At least three telescopic limiting devices are arranged, telescopic limiting device is evenly distributed along the axial direction of fixture body, one end of telescopic limiting device is fixedly connected with fixture body, the other end of telescopic limiting device is used to abut the inner wall of cable conduit;Rotary hinge base is arranged in the center of fixture body, rotary hinge base is used to install measuring prism, and measuring prism is rotatably connected with rotary hinge base.The application discloses a kind of cable conduit measurement automatic positioning fixtures and its using method, by setting telescopic limiting device in the center of fixture body, cable conduit inner wall is clamped, a set of tooling can realize the positioning operation of multiple specifications cable conduit;By setting hinge base in the center of fixture body, measuring prism is fixed and the angle of prism can be adjusted, and the alignment of prism is simple, and the measurement accuracy is easy to control.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and more specifically to an automatic positioning fixture for cable guide measurement and its usage method. Background Technology

[0002] During the construction of cable-stayed bridges, the cable guide ducts serve as guides and protective channels for the stay cables, and their installation accuracy directly affects the stress state of the stay cables and the bridge's alignment. The precise installation and positioning of the cable guide ducts, especially the accurate measurement of the spatial coordinates of their center points, is a crucial aspect of construction control.

[0003] In the prior art, clamps used for measuring the center point of the cable conduit port typically have the following shortcomings: Poor adaptability and high cost: Traditional clamps are mostly designed with fixed dimensions, with their outer diameter corresponding one-to-one with the inner diameter of specific cable guide tubes. Since the specifications of cable guide tubes (such as inner diameter and wall thickness) vary in actual projects, construction parties need to manufacture or purchase different special clamps for each specification, resulting in a wide variety of tooling equipment, management difficulties, and increased construction costs and management complexity.

[0004] Measurement accuracy is difficult to guarantee: When performing measurement positioning, a miniature prism is usually used as the measurement target. Current practices often involve operators manually fixing the prism temporarily or holding it near the center of the cable guide tube, lacking a stable and reliable positioning and alignment device. The prism's center position is difficult to precisely align with the geometric center of the cable guide tube, and the prism's orientation (such as verticality) is difficult to adjust and control, easily introducing human error and thus affecting the final measurement accuracy of the cable guide tube installation.

[0005] Therefore, how to provide an automatic positioning fixture for cable guide measurement that can adapt to various specifications, has high positioning accuracy, and is easy to operate, and how to use it, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides an automatic positioning fixture for cable guide measurement and its usage method, which aims to solve one of the problems in the above-mentioned background technology, and can adapt to various specifications, with high positioning accuracy and convenient operation.

[0007] To achieve the above objectives, the present invention provides an automatic positioning fixture for cable duct measurement and a method for using the same, comprising: The fixture body; At least three retractable limiting devices are provided, which are evenly distributed circumferentially along the axial direction of the clamp body. One end of each retractable limiting device is fixedly connected to the clamp body, and the other end of each retractable limiting device is used to abut against the inner wall of the cable guide tube to center and fix the clamp body to the opening of the cable guide tube. A rotating hinge seat is provided at the center of the fixture body. The rotating hinge seat is used to mount a measuring prism, and the measuring prism is rotatably connected to the rotating hinge seat.

[0008] Furthermore, four retractable limiting devices are provided, all arranged in a circle at the center of the clamp body, with adjacent retractable limiting devices vertically arranged in the horizontal direction.

[0009] Furthermore, the retractable limiting device is provided with scale markings to indicate its radial extension length.

[0010] Furthermore, the rotating hinge is configured as a ball joint or a universal joint, which enables the measuring prism to be adjusted in multiple directions.

[0011] Furthermore, the retractable limiting device is configured as any one of an adjusting bolt, a pneumatic telescopic rod, a hydraulic telescopic rod, or a spring pin.

[0012] On the other hand, the present invention provides a method for using an automatic positioning fixture for measuring cable conduits. Based on the above-described automatic positioning fixture for measuring cable conduits, the method is characterized by the following steps: Step 1: Rough positioning of the lower end of the cable guide pipe: On the construction template or positioning bracket, the position and elevation of the anchor plate at the lower end of the cable guide pipe are initially laid out and fixed; Step 2: Install the measuring clamp: Place the adjustable measuring clamp at the upper end of the cable guide tube, adjust each telescopic limit device to extend it outward and press it against the inner wall of the cable guide tube, and observe the scale markings to ensure that the extension of each limit device is consistent, so that the center of the clamp body coincides with the center of the upper opening of the cable guide tube. Step 3: Install and adjust the measuring prism: Install the measuring prism on the rotating hinge and adjust the rotating hinge according to the design inclination angle of the cable guide so that the mirror surface of the measuring prism is in a vertical position that is convenient for total station measurement. Step 4: Precise positioning of the cable guide pipe: Use a total station to measure the center coordinates of the measuring prism and obtain the measured three-dimensional coordinates of the center of the upper opening of the cable guide pipe. Adjust the spatial position of the cable guide pipe using an adjustment device until the deviation between the measured coordinates and the design coordinates meets the specification requirements. Step 5, Final Fixing: After verifying that the positions of the upper and lower ends of the cable guide tube and the straightness of the tube body are correct, the cable guide tube is finally welded and fixed to the beam steel reinforcement cage or positioning bracket.

[0013] As can be seen from the above technical solution, compared with the prior art, the present invention discloses an automatic positioning fixture for cable conduit measurement and its usage method, the beneficial effects of which are: 1) High versatility and reduced cost: By setting a retractable limiting device in the center of the clamp, it can clamp the inner wall of cable guide tubes with different inner diameters. This allows one set of tooling to be applicable to the positioning and measurement of cable guide tubes of various specifications, greatly reducing the types and quantities of tooling equipment and reducing manufacturing, procurement and management costs. 2) High positioning accuracy and convenient operation: The rotating hinge at the center of the fixture not only provides a stable mounting point for the measuring prism, but also allows the operator to flexibly adjust the prism's attitude according to the inclination angle of the cable guide, ensuring the prism is in the optimal measuring state (e.g., vertical). This fundamentally solves the problems of difficult prism centering and uncontrollable attitude, significantly improving measurement accuracy and work efficiency. The scale markings on the extendable limit device further ensure the precise controllability of the centering process. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This invention provides a structural schematic diagram of an automatic positioning fixture for measuring cable guide tubes. Figure 2 This is a top view of an automatic positioning fixture for measuring cable guide tubes provided by the present invention.

[0016] Wherein: 1 is the cable guide; 2 is the clamp; 3 is the small prism; 4 is the rotating hinge seat; 5 is the adjustable limiting device. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] See Figure 1-2 This invention discloses an automatic positioning fixture for measuring cable guide tubes, comprising: The clamp body 2 is used to support and connect other components. The clamp body 2 is designed in a cross or disc shape to reduce weight and ensure the certainty of the center position. At least three retractable limiting devices 5 are provided. The retractable limiting devices 5 are evenly distributed in a circle along the axial direction of the clamp body 2. One end of the retractable limiting device 5 is fixedly connected to the clamp body 2, and the other end of the retractable limiting device 5 is used to abut against the inner wall of the cable guide 1. The retractable limiting device 5 can change its extension length to adapt to cable guides 1 with different inner diameters. During operation, by observing the scale markings on the adjusting bolt rod, it can be ensured that the extension amount in four directions is completely consistent, thereby accurately ensuring that the center of the clamp body 2 coincides with the port center of the cable guide 1. Rotary hinge 4 is located at the center of clamp body 2. Rotary hinge 4 is used to install measuring prism 3. Measuring prism 3 is rotatably connected to rotating hinge 4. Rotary hinge 4 is set as a ball joint, which allows measuring prism 3 to rotate freely within a certain range in space so that the mirror surface of measuring prism 3 can be adjusted to be vertical or facing the best observation direction of total station according to the installation tilt angle of cable guide 1.

[0019] In this embodiment, four retractable limiting devices 5 are provided. The four retractable limiting devices 5 are arranged in a circle at the center of the clamp body 2, and two adjacent retractable limiting devices 5 are arranged vertically in the horizontal direction. Specifically, in this embodiment, the retractable limiting devices 5 are set as four adjusting bolts with scale markings. These four adjusting bolts are evenly arranged in a "+" shape along the circumference of the clamp body 2 and can be extended and retracted along the radial direction of the clamp body 2. The threaded end of the adjusting bolt is used to press against the inner wall of the cable guide 1.

[0020] In this embodiment, the retractable limiting device 5 is provided with a scale marking for indicating its radial extension length.

[0021] In this embodiment, the rotating hinge 4 is configured as a ball joint or a universal joint, and the rotating hinge 4 enables the angle adjustment of the measuring prism 3 in multiple directions.

[0022] In this embodiment, the telescopic limiting device 5 is configured as any one of an adjusting bolt, a pneumatic telescopic rod, a hydraulic telescopic rod, or a spring pin.

[0023] On the other hand, the present invention provides a method for using an automatic positioning fixture for measuring cable conduits. Based on the above-described automatic positioning fixture for measuring cable conduits, the method is characterized by the following steps: Step 1: Rough positioning of the lower end of cable guide tube 1: On the construction template or positioning bracket, the position and elevation of the anchor plate at the lower end of cable guide tube 1 are initially laid out and fixed; Step 2: Install the measuring clamp: Place the adjustable measuring clamp at the upper end of the cable guide tube 1, adjust each telescopic limiting device 5 to extend outward and press against the inner wall of the cable guide tube 1, and ensure that the extension of each limiting device is consistent by observing the scale markings, so that the center of the clamp body coincides with the center of the upper opening of the cable guide tube 1. Step 3: Install and adjust the measuring prism 3: Install the measuring prism 3 on the rotating hinge 4, and adjust the rotating hinge 4 according to the design inclination angle of the cable guide 1 so that the mirror surface of the measuring prism 3 is in a vertical position that is convenient for total station measurement. Step 4: Precise positioning of cable guide 1: Use a total station to measure the center coordinates of the measuring prism 3 and obtain the measured three-dimensional coordinates of the upper center of cable guide 1. Adjust the spatial position of cable guide 1 using the adjustment device until the deviation between the measured coordinates and the design coordinates meets the specification requirements. Step 5, Final Fixing: After verifying that the positions of the upper and lower ends of the cable guide tube 1 and the straightness of the tube body are correct, the cable guide tube 1 is finally welded and fixed to the beam steel reinforcement cage or positioning bracket.

[0024] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0025] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic positioning fixture for measuring cable guide tubes, characterized in that, include: Clamp body (2); At least three retractable limiting devices (5) are provided. The retractable limiting devices (5) are evenly distributed in a circle along the axial direction of the clamp body (2). One end of the retractable limiting device (5) is fixedly connected to the clamp body (2), and the other end of the retractable limiting device (5) is used to abut against the inner wall of the cable guide (1). A rotating hinge (4) is located at the center of the fixture body (2). The rotating hinge (4) is used to install a measuring prism (3). The measuring prism (3) is rotatably connected to the rotating hinge (4).

2. The automatic positioning fixture for measuring cable guide tubes according to claim 1, characterized in that, Four retractable limiting devices (5) are provided, and the four retractable limiting devices (5) are arranged in a circle at the center of the clamp body (2). Two adjacent retractable limiting devices (5) are arranged vertically in the horizontal direction.

3. The automatic positioning fixture for measuring cable guide tubes according to claim 1, characterized in that, The retractable limiting device (5) is provided with a scale marking to indicate its radial extension length.

4. The automatic positioning fixture for measuring cable guide tubes according to claim 1, characterized in that, The rotating hinge (4) is configured as a ball joint or universal joint, and the rotating hinge (4) enables the angle adjustment of the measuring prism (3) in multiple directions.

5. The automatic positioning fixture for measuring cable guide tubes according to claim 3, characterized in that, The retractable limiting device (5) is configured as any one of the following: adjusting bolt, pneumatic telescopic rod, hydraulic telescopic rod or spring pin.

6. A method of using an automatic positioning fixture for measuring cable guide tubes, based on the automatic positioning fixture for measuring cable guide tubes according to any one of claims 1-5, characterized in that, Specifically, the following steps are included: Step 1: Rough positioning of the lower end of the cable guide (1): On the construction template or positioning bracket, the position and elevation of the anchor plate at the lower end of the cable guide (1) are initially laid out and fixed; Step 2: Install the measuring clamp: Place the adjustable measuring clamp at the upper end of the cable guide (1), adjust each telescopic limiting device (5) to extend it outward and press it against the inner wall of the cable guide (1), and ensure that the extension of each limiting device is consistent by observing the scale markings, so that the center of the clamp body coincides with the center of the upper opening of the cable guide (1); Step 3: Install and adjust the measuring prism (3): Install the measuring prism (3) on the rotating hinge (4), and adjust the rotating hinge (4) according to the design angle of the cable guide (1) so that the mirror surface of the measuring prism (3) is in a vertical position that is convenient for total station measurement. Step 4: Precise positioning of cable guide (1): Use a total station to measure the center coordinates of the measuring prism (3) and obtain the measured three-dimensional coordinates of the center of the upper opening of the cable guide (1). Adjust the spatial position of the cable guide (1) using the adjustment device until the deviation between the measured coordinates and the design coordinates meets the specification requirements. Step 5, final fixation: After verifying that the positions of the upper and lower ends of the cable guide (1) and the straightness of the pipe body are correct, the cable guide (1) is finally welded and fixed to the beam steel reinforcement skeleton or positioning bracket.

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