Quick positioning and distance measuring device for cable anchoring point of cable-stayed bridge

Abstract

The utility model discloses a rapid positioning and distance measuring device for an anchoring point of a cable-stayed bridge cable, and belongs to the technical field of bridge construction. The device comprises a cable tower end device and a beam end device, the cable tower end device comprises a mounting platform, a laser range finder and an angle gauge, the mounting platform is of a disc-shaped structure, a light through hole penetrating through the thickness of the mounting platform is formed in the middle of the mounting platform, four sliding grooves are symmetrically formed in the mounting platform, and the lower portion of the mounting platform is slidably connected with centering sliding blocks corresponding to the four sliding grooves respectively; a graduated scale is arranged on the side face of the sliding groove in the installation platform, the laser range finder is arranged above the installation platform through an adjustable supporting frame, the angle gauge is arranged on the side face of the laser range finder, and the beam end device is a reflecting plate with equal-distance loop lines drawn on the surface. The installation platform is arranged on the upper surface of a stay cable anchor block at the cable bent tower end and fixed to the inner side wall of a cable guide pipe pre-buried at the cable bent tower end in a matched mode through a centering sliding block, and the reflection plate is arranged at the beam end stay cable anchoring position.

Description

Technical Field

[0001] This utility model relates to a rapid positioning and ranging device for cable anchorage points of cable-stayed bridges, belonging to the field of bridge construction technology. Background Technology

[0002] Cable-stayed bridges, a widely used form of long-span bridge, are mainly composed of towers, main girders, and stay cables. One end of each stay cable connects to the main girder, and the other end connects to the tower. The weight of the main girders is transferred to the tower and foundation via the stay cables. The positioning and installation of the cable guides is a crucial step in the construction of cable-stayed bridges, playing a vital role in ensuring their structural stability and safety.

[0003] In actual construction, the measurement and positioning of the cable guide pipes requires high precision and involves a large workload. After the cable guide pipes on the tower are installed, the steps for installing the cable guide pipes on the beam must be repeated. The coaxial positional relationship between the cable guide pipes on the tower and the beam cannot be utilized. Furthermore, traditional measurement methods are easily affected by adverse weather conditions such as rain, snow, and fog, slowing down the construction progress and leading to frequent random errors. In addition, the distance between the actual anchorage points of the cable guide pipes on the tower and the actual anchorage points of the cable guide pipes on the beam directly affects the length of the stay cables. Current technology for confirming the anchorage position of stay cables in cable-stayed bridges mainly relies on dimensional calculations from design drawings and modeling calculations, and cannot be directly measured. The main reason for this is that as the tower is gradually constructed, the anchorage position of the stay cables at the tower end is enclosed within the tower column, and can only be observed outside the tower through the cable guide pipe. The observation area is small, making it difficult to use traditional instruments. Utility Model Content

[0004] To address the aforementioned deficiencies in the existing technology, this utility model provides a rapid positioning and ranging device for cable anchorage points of cable-stayed bridges. This device can quickly locate the corresponding cable guide pipe position on the beam by using the position of the existing installed cable guide pipe on the tower, and can accurately measure the distance between the actual anchorage point on the tower and the actual anchorage point on the beam.

[0005] This utility model is achieved through the following technical solution: a rapid positioning and ranging device for the anchorage points of cable-stayed bridges, comprising a tower end device and a beam end device. The tower end device includes an installation platform, a laser rangefinder, and an angle meter. The installation platform has a disc-shaped structure, with a light-transmitting hole penetrating its thickness in the center. Four radially arranged grooves are symmetrically arranged on the installation platform. A centering slider is slidably connected to each of the four grooves at the bottom of the installation platform. A locking structure is provided at the top of the installation platform to fix the centering slider. A scale is provided on the side. The laser rangefinder is mounted above the installation platform via a support frame. The support frame includes a first support arm and a second support arm that are hinged together. The lower end of the first support arm is hinged to the installation platform. The laser rangefinder is connected to the second support arm. An angle meter is located on the side of the laser rangefinder. The beam end device is a reflector with equidistant rings drawn on its surface. The installation platform is located on the upper surface of the cable anchor block at the cable tower end and is fixed by a centering slider in cooperation with the inner wall of the cable guide pipe pre-embedded at the cable tower end. The reflector is located at the cable anchor point at the beam end.

[0006] In this invention, the tower-end device is fixed to the upper surface of the stay cable anchor block at the tower end via its mounting platform and centering slider. The centering slider on the mounting platform can move along a sliding groove, and the position of each centering slider can be adjusted using a scale on the side of the sliding groove to center the device. The support frame serves as a bridge connecting the laser rangefinder and the mounting platform. The position and angle of the laser rangefinder can be adjusted by adjusting the first and second support arms to ensure that the center of the laser rangefinder is coaxial with the axis of the cable guide tube pre-embedded at the tower end. An angle gauge located on the side of the laser rangefinder is used to observe the deflection angle of the laser rangefinder, thereby ensuring that the center of the laser rangefinder is coaxial with the axis of the cable guide tube pre-embedded at the tower end. The light-transmitting hole in the middle of the mounting platform serves as the laser path. When this invention is in operation, after adjusting the center of the laser rangefinder to be coaxial with the axis of the cable guide tube pre-embedded at the tower end, the laser rangefinder is started. The laser emitted by the laser rangefinder passes through the light-transmitting hole on the installation platform and is directed along the axis of the cable guide tube pre-embedded at the tower end to the reflector plate at the anchorage of the cable at the beam end. A light spot is obtained on the reflector plate, which is the anchorage position of the cable at the beam end. Based on the distance between the two points measured by the laser rangefinder, the actual distance between the anchorage position at the tower end and the anchorage position at the beam end can be easily obtained, which is the exposed length of the cable. Thus, the cutting length of the cable can be easily calculated.

[0007] Furthermore, to ensure measurement accuracy, the diameter of the light-transmitting hole is 2 cm.

[0008] Furthermore, to ensure the installation platform is securely fixed, a rubber anti-slip pad is fixed to the outer side of the centering slider.

[0009] Furthermore, to prevent the device from falling, anti-fall blocks are provided at the edges of the installation platform.

[0010] Furthermore, for ease of installation, a mounting sleeve is fixed on the second support arm, and the laser rangefinder is fitted inside the mounting sleeve, which is equipped with fastening bolts.

[0011] Furthermore, to reduce weight and facilitate installation and transportation, the installation platform and support frame are made of engineering plastics.

[0012] The beneficial effects of this utility model are as follows: This utility model has a simple structure and a small overall size of the tower end device, allowing for convenient installation within the tower columns of a completed cable tower. Furthermore, the tower end device is easy to install, adjust, and operate, enabling single-person operation, simplifying construction, and increasing efficiency. This utility model utilizes the coaxial positional relationship between the tower-mounted cable guide and the beam-mounted cable guide, enabling rapid location of the corresponding beam-mounted cable guide position based on the existing installed tower-mounted cable guide position. This assists in verifying the installation of the beam-end cable guide, improving the efficiency and accuracy of beam-mounted cable guide installation. Simultaneously, this utility model can accurately measure the distance between the actual anchorage points on the tower and the beam, providing an accurate and intuitive basis for cable length cutting. This utility model has a simple structure and convenient measurement capabilities, effectively solving the problem of the inability to measure the actual anchorage points of the cable guides after the bridge tower concrete pouring is completed. Attached Figure Description

[0013] Figure 1 This is a sectional view of the cable anchorage of a cable-stayed bridge;

[0014] Figure 2 This is a schematic diagram of the structure of the tower end device in this utility model (some centering sliders are omitted in the figure);

[0015] Figure 3 This is a top view schematic diagram of the installation platform of the tower end device in this utility model;

[0016] Figure 4 This is a top view of the reflector in this utility model;

[0017] Figure 5 This is an installation diagram of this utility model;

[0018] Figure 6 yes Figure 5 Enlarged schematic diagram of the middle tower end section;

[0019] In the diagram, 1 is the main beam, 2 is the tower, 3 is the stay cable, 4 is the cable guide at the tower end, 5 is the stay cable anchor block at the tower end, 6 is the tower end device, and 7 is the reflector.

[0020] 101. Anchorage point of the stay cable at the beam end; 201. Anchorage point of the stay cable at the tower end;

[0021] 601. Mounting platform; 602. Fastening bolts; 603. Mounting sleeve; 604. Laser rangefinder; 605. Angle gauge; 606. Second support arm; 607. Second hinge; 608. First support arm; 609. First hinge; 610. Light-transmitting hole; 611. Centering slider; 612. Rubber anti-slip pad; 613. Anti-fall block; 614. Locking nut; 615. Slide groove; 616. Ruler. Detailed Implementation

[0022] The present invention will be further described below through non-limiting embodiments and in conjunction with the accompanying drawings:

[0023] As shown in the attached figure, a rapid positioning and ranging device for cable anchorage points of a cable-stayed bridge includes a tower end device 6 installed at the tower end and a beam end device installed at the main beam end. The tower end device includes an installation platform 601, a laser rangefinder 604, and an angle meter 605. The installation platform 601 has a disc-shaped structure, with a light-transmitting hole 610 penetrating its thickness in the center. The light-transmitting hole 610 serves as a laser path, and to ensure measurement accuracy, its diameter is preferably 2 cm. Four radially arranged sliding grooves 615 are symmetrically arranged on the installation platform 601. A centering slider 611 is slidably connected to each of the four sliding grooves 615 at the lower part of the installation platform 601. A connecting piece, which can be a threaded rod, is slidably installed within the sliding groove 615 and connected to the centering slider 611. A locking nut 614 is installed on the upper part of the installation platform 601 and connected to the threaded rod, locking the centering slider 611 in place. The centering slider 611 is used to adjust the centering of the device and to cooperate with the inner wall of the cable guide pipe pre-embedded at the tower end to fix the installation platform. To ensure reliable fixation of the installation platform, a rubber anti-slip pad 612 is fixed to the outer side of the centering slider 611 in this embodiment. To facilitate determining the position of the centering slider 611 and to facilitate quick adjustment of the centering, a scale 616 is provided on the side of the slide groove 615 on the installation platform 601. To prevent the device at the tower end from falling and ensure safety, it is preferable to provide multiple anti-fall blocks 613 at the edge of the installation platform 601. A laser rangefinder 604 is mounted above a mounting platform 601 via a support frame. The support frame includes a first support arm 608 and a second support arm 606, which are hinged together by a second hinge 607. The lower end of the first support arm 608 is hinged to the mounting platform 601 via a first hinge 609. The laser rangefinder 604 is connected to the second support arm 606. The position and angle of the laser rangefinder 604 can be adjusted by adjusting the first and second support arms 608 and 606. To ensure that the first and second support arms 608 and 606 remain in a fixed position after adjustment, it is preferable that both the first hinge 609 and the second hinge 607 are lockable hinges or damped hinges. Lockable hinges and damped hinges are existing technologies. To facilitate the installation of the laser rangefinder, in this embodiment, a mounting sleeve 603 is fixed to the second support arm 606, and the laser rangefinder 604 is fitted inside the mounting sleeve 603. The mounting sleeve 603 is equipped with fastening bolts 602, which secure the laser rangefinder 604. An angle gauge 605 is located on the side of the laser rangefinder 604. The angle gauge 605 is existing technology and allows observation of the deflection angle of the laser rangefinder 604. To reduce weight and facilitate installation and transportation, it is preferable that the installation platform and support frame are made of engineering plastics or other lightweight, high-strength polymer materials.The beam-end device is a reflective plate 7 with equidistant rings drawn on its surface. The reflective plate 7 is made of a rigid material measuring 0.5 × 0.5 m, coated with a reflective paint to enhance laser reflection efficiency and make the laser spot easier to identify with the naked eye. The equidistant rings drawn on the reflective plate surface help determine the laser landing point deviation. During tower-end device installation, the installation platform 601 is placed on the upper surface of the stay cable anchor block 5 at the tower end. The installation platform 601 is fixed by four centering sliders 611 engaging with the inner wall of the cable guide 4 at the tower end. The reflective plate 7 is located at the stay cable anchorage at the beam end.

[0024] The laser rangefinder 604 in this invention is existing technology and can be purchased. The power of the laser rangefinder 604 must meet the requirements, the laser range should be greater than 150m, and the spot size at the 150m position should not be greater than 20mm. For example, the laser rangefinder sensor used in this invention is manufactured by Shenzhen Duosheng Technology Co., Ltd., and its model is RWRFA2.

[0025] This utility model is applicable when the cable guide at the tower end has been completed. In use, the installation platform 601 of the tower end device 6 is placed on the upper surface of the cable anchor block at the tower end, i.e., the upper port of the cable guide 4 at the tower end. At this time, the installation platform 601 covers the pipe opening, and the four centering sliders 611 are located inside the cable guide. The centering sliders 611 are adjusted according to the scale 616 so that the installation platform is located in the center of the cable guide 4 at the tower end, and the centering sliders 611 are pressed tightly against the inner wall of the cable guide. The centering sliders 611 are locked using the locking nut 614. The first support arm 608 and the second support arm 606 are adjusted so that the center of the laser rangefinder 604 is coaxial with the axis of the cable guide 4 at the tower end (the actual tilt angle of the cable guide can be measured in advance; during adjustment, the deflection angle of the laser rangefinder 604 is observed through the angle meter 605). The reflector 7 is placed at the anchorage of the cable at the beam end. When the laser rangefinder 604 is turned on, the laser emitted by the laser rangefinder 604 passes through the light-transmitting hole 610 on the mounting platform 601 and is directed along the axis of the cable guide tube at the end of the tower to the reflector plate 7 at the anchorage of the cable at the beam end. A light spot is obtained on the reflector plate 7, which is the anchorage position of the cable at the beam end. Based on the distance between the two points measured by the laser rangefinder, the actual distance between the anchorage position at the tower end and the anchorage position at the beam end can be easily obtained, which is the exposed length of the cable. Thus, the cutting length of the cable can be easily calculated.

[0026] The other parts in this embodiment are all existing technologies and will not be described in detail here.

Claims

1. A rapid positioning and ranging device for cable anchorage points of cable-stayed bridges, characterized in that: The system includes a tower-end device and a beam-end device. The tower-end device includes an installation platform, a laser rangefinder, and an angle gauge. The installation platform has a disc-shaped structure with a light-transmitting hole penetrating its thickness in the center. Four radially arranged grooves are symmetrically arranged on the installation platform. A centering slider is slidably connected to each of the four grooves at the bottom of the installation platform. A locking structure is provided at the top of the installation platform to fix the centering slider. A scale is provided on the side of the groove on the installation platform. The laser rangefinder is mounted above the installation platform via a support frame. The support frame includes a first support arm and a second support arm that are hinged together. The lower end of the first support arm is hinged to the installation platform, and the laser rangefinder is connected to the second support arm. The angle gauge is located on the side of the laser rangefinder. The beam-end device is a reflector with equidistant rings drawn on its surface. The installation platform is set on the upper surface of the cable anchor block at the tower end and is fixed by the centering slider to the inner wall of the cable guide pipe pre-embedded at the tower end. The reflector is located at the cable anchor point at the beam end.

2. The rapid positioning and ranging device for cable anchorage points of cable-stayed bridges according to claim 1, characterized in that: The diameter of the light-transmitting hole is 2cm.

3. The rapid positioning and ranging device for cable anchorage points of cable-stayed bridges according to claim 2, characterized in that: A rubber anti-slip pad is fixed to the outer side of the centering slider.

4. The rapid positioning and ranging device for cable anchorage points of cable-stayed bridges according to claim 1, 2, or 3, characterized in that: The installation platform is equipped with anti-fall blocks at its edge.

5. The rapid positioning and ranging device for cable anchorage points of cable-stayed bridges according to claim 1, 2, or 3, characterized in that: A mounting sleeve is fixed on the second support arm, and the laser rangefinder is fitted inside the mounting sleeve, which is equipped with fastening bolts.

6. The rapid positioning and ranging device for cable anchorage points of cable-stayed bridges according to claim 1, 2, or 3, characterized in that: The installation platform and support frame are both made of engineering plastics.

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