Suspension bridge reference cable strand sag measuring device

Abstract

The utility model discloses a suspension bridge reference strand sag measuring device, which comprises a prism, a connecting device and a fixing device, the fixing device comprises a left clamping block, a right clamping block, a bottom clamping block, a circular positioning hole and a fastening screw, and the connecting device comprises a rolling groove, a ball, a connecting rod, a level bubble, an adapter, a connecting rod circular hole, a connecting support rod and a ball concave circular groove. Before installation, the fastening screws need to be unscrewed, the left clamping block and the right clamping block are adjusted to be tightly attached to and clamped with the reference cable strand, and then the fastening screws are screwed in to enable the left clamping block, the right clamping block and the bottom clamping block to form a stable whole and to be fixed with the reference cable strand. The ball can freely and horizontally rotate in the rolling groove, the top end of the connecting rod is connected with the ball to form a whole, the bottom end of the connecting rod is connected with the prism through the adapter, and the level bubble is installed on the side edge of the connecting rod. The device has the advantages that high-precision measurement of the sag of the reference cable strand can be realized in a general cable strand erecting process, and the prism is always kept in a vertical state under the action of gravity.

Description

Technical Field

[0001] This utility model relates to the field of suspension bridge construction surveying, and in particular to a device for measuring the sag of a reference cable strand in a suspension bridge. Background Technology

[0002] As the core structure of a suspension bridge, the main cable not only requires sufficient load-bearing capacity but also structural stability. To ensure the structural stability of the main cable, the relative sag deviation between the two main cables must meet design requirements. The main cable is typically composed of multiple strands, and the sag of each strand determines the sag of the main cable. Since the strands are numerous and closely spaced, one strand is usually erected first as the reference strand, and the sag of the other strands is adjusted based on this reference strand. To ensure the effective erection of the main cable and prevent excessive deviation in the main cable sag due to changes in the reference strand's sag, the sag of the reference strand needs to be checked in stages during the erection of the other strands. Because multiple other strands are already erected above the reference strand, and these strands are closely spaced, it is impossible to use a conventional prism to check the sag of the reference strand. Summary of the Invention

[0003] The purpose of this invention is to provide a suspension bridge reference cable sag measuring device that can accurately measure the sag of the reference cable strand, is easy to install, and is convenient to operate.

[0004] The purpose of this utility model is achieved as follows:

[0005] A device for measuring the sag of a reference cable strand in a suspension bridge, characterized in that it includes a prism, a connecting device, and a fixing device, wherein:

[0006] The fixing device includes a left clamping block, a right clamping block, a bottom clamping block, circular positioning holes, and fastening screws. The symmetrically arranged left and right clamping blocks are placed on the left and right sides of the horizontal bottom clamping block, respectively. The reference cable strand is placed on top of the bottom clamping block. The inner dimensions of the left and right clamping blocks are the same as the dimensions of the reference cable strand, and they are tightly attached to the two sides of the reference cable strand. Circular positioning holes are provided at the bottom ends of the left and right clamping blocks, and at the left and right ends of the bottom clamping block. The circular positioning holes at the left and right ends of the bottom clamping block are connected to the circular positioning holes at the bottom ends of the left and right clamping blocks, respectively, by fastening screws and nuts. The left and right clamping blocks are hinged to the left and right ends of the bottom clamping block in an inverted V-shape. The bottom clamping block has a trapezoidal structure.

[0007] The connecting device includes a groove, balls, a connecting rod, an adapter, a connecting rod hole, a connecting support rod, and a concave circular groove in the balls. A circular groove running through the center of the bottom clamping block is provided, and a solid ball is placed within the groove. One end of the ball has a concave circular groove with internal threads. The groove is smooth around its edges, ensuring the ball can rotate freely horizontally within it. Directly below the groove is a downward-opening connecting rod hole that communicates with the groove; the diameter of the connecting rod hole is smaller than the diameter of the balls. At the top center of the connecting rod is a connecting support rod with a diameter smaller than the connecting rod hole. The side wall at the top of the connecting support rod has external threads that mate with the concave circular groove in the balls. The connecting support rod passes through the connecting rod hole from bottom to top and connects with the internal threads in the concave circular groove at the bottom of the balls, forming a single unit. The connecting rod remains vertical under gravity. An adapter is installed at the bottom of the connecting rod, and the connecting rod connects to the top of the prism via the adapter.

[0008] Furthermore, the connecting device also includes a level bubble, with a level bubble on the side of the connecting rod for checking the verticality of the connecting rod.

[0009] This invention includes a prism, a connecting device, and a fixing device. The fixing device includes a left clamping block, a right clamping block, a bottom clamping block, a circular positioning hole, and a fastening screw. The connecting device includes a groove, a ball bearing, a connecting rod, a level bubble, an adapter, a circular hole in the connecting rod, a connecting support rod, and a concave circular groove in the ball bearing. This invention forms a stable whole with the reference cable strand through the fixing device, and connects the prism and the fixing device into a stable whole through the connecting device. Simultaneously, the prism remains vertical under the influence of gravity, ensuring that the height difference between the prism and the reference cable strand remains consistent. By observing the prism's elevation, the sag of the reference cable strand can be measured with high precision.

[0010] Compared with the prior art, this utility model has the following advantages:

[0011] 1. It can achieve high-precision measurement of the sag of the reference cable strand during the general cable strand erection process;

[0012] 2. Under the influence of gravity, the prism always remains vertical;

[0013] 3. Easy to install, simple structure, and convenient operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model when it is to be installed;

[0015] Figure 2 This is a schematic diagram of the structure of this utility model after installation;

[0016] Figure 3 This is the left view of the present invention;

[0017] Figure 4 This is a schematic diagram of the bottom clamping block.

[0018] In the diagram: 1. Reference cable strand; 2. Left clamping block; 3. Right clamping block; 4. Bottom clamping block; 5. Circular positioning hole; 6. Fastening screw; 7. Groove; 8. Ball bearing; 9. Connecting rod; 10. Level bubble; 11. Adapter; 12. Prism; 13. Circular hole of connecting rod; 14. Connecting support rod; 15. Concave circular groove of ball bearing. Detailed Implementation

[0019] The present invention will now be clearly and completely described in conjunction with the embodiments and the accompanying drawings.

[0020] A device for measuring the sag of a reference cable strand in a suspension bridge includes a prism 12, a connecting device, and a fixing device, wherein:

[0021] The fixing device includes a left clamping block 2, a right clamping block 3, a bottom clamping block 4, circular positioning holes 5, and fastening screws 6. The symmetrically arranged left clamping block 2 and right clamping block 3 are placed on the left and right sides of the horizontal bottom clamping block 4, respectively. The reference cable strand 1 is placed on top of the bottom clamping block 4. The inner dimensions of the left clamping block 2 and right clamping block 3 are the same as the dimensions of the reference cable strand 1, and they are tightly attached to the two sides of the reference cable strand 1. Circular positioning holes 5 are provided at the bottom end of the left clamping block 2, the bottom end of the right clamping block 3, and the left and right ends of the bottom clamping block 4, respectively. The circular positioning holes 5 at the left and right ends of the bottom clamping block 4 are connected to the circular positioning holes 5 at the bottom end of the left clamping block 2 and the bottom end of the right clamping block 3, respectively, by fastening screws 6 and nuts. The left clamping block 2 and right clamping block 3 are hinged to the left and right ends of the bottom clamping block 4 in an inverted V-shape. The bottom clamping block 4 has a trapezoidal structure.

[0022] The connecting device includes a groove 7, a ball bearing 8, a connecting rod 9, a level bubble 10, an adapter 11, a connecting rod circular hole 13, a connecting support rod 14, and a ball bearing concave groove 15. A circular groove 7, running through the entire length of the bottom clamping block 4, is provided in the middle. A solid ball bearing 8 is placed inside the groove 7. One end of the ball bearing 8 has a threaded concave groove 15. The groove 7 is smooth on all sides, ensuring that the ball bearing 8 can rotate freely horizontally within it. A connecting rod circular hole 13, opening downwards and communicating with the groove 7, is located directly below it. The diameter of the connecting rod circular hole 13 is smaller than the diameter of the ball bearing 8. The connecting rod 9... The top center of the connecting rod 14 is provided with a connecting rod 14 having a diameter smaller than that of the connecting rod hole 13. The side wall of the top of the connecting rod 14 is provided with an external thread that mates with the inner concave groove 15 of the ball on the ball 8. The connecting rod 14 passes through the connecting rod hole 13 from bottom to top and connects with the internal thread in the inner concave groove 15 of the ball at the bottom of the ball 8 to form a whole. The connecting rod 9 always remains vertical under the action of gravity. A level bubble 10 is provided on the side of the connecting rod 9 to check the verticality of the connecting rod 9. An adapter 11 is installed at the bottom of the connecting rod 9, and the connecting rod 9 is connected to the top of the prism 12 through the adapter 11.

[0023] The installation process is as follows:

[0024] 1. Loosen the fastening screw 6 so that the left clamping block 2 and the right clamping block 3 rotate around the fastening screw 6 respectively. Adjust the left clamping block 2 and the right clamping block 3 to fit tightly against the reference cable strand 1. Tighten the fastening screw 6 so that the left clamping block 2, the right clamping block 3 and the bottom clamping block 4 form a stable whole and remain fixed with the reference cable strand 1.

[0025] 2. A ball bearing 8 is installed in the circular groove 7 in the middle of the bottom clamping block 4. The connecting rod 14 passes through the connecting rod circular hole 13 from bottom to top and is connected to the internal thread of the ball bearing concave circular groove 15 at the bottom of the ball bearing 8. The top of the connecting rod 9 is connected to the ball bearing 8 through the connecting rod 14 to form a whole. The connecting rod 9 always remains vertical under the action of gravity.

[0026] 3. A level bubble 10 is installed on the side of the connecting rod 9 to check whether the connecting rod 9 is in a vertical state. An adapter 11 is installed at the bottom of the connecting rod 9 to connect the prism 12, thus completing the installation of this utility model.

[0027] Working principle: This utility model forms a stable whole with the reference cable strand through the fixing device, and connects the prism to the fixing device through the connecting device to form a stable whole. At the same time, the prism always remains vertical under the action of gravity, ensuring that the height difference between the prism and the reference cable strand is always consistent. By observing the elevation of the prism, the sag of the reference cable strand can be measured with high precision.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the sag of a reference cable strand in a suspension bridge, characterized in that: Includes a prism, a connecting device, and a fixing device, wherein: The fixing device includes a left clamping block, a right clamping block, a bottom clamping block, circular positioning holes, and fastening screws. The symmetrically arranged left and right clamping blocks are placed on the left and right sides of the horizontal bottom clamping block, respectively. The reference cable strand is placed on top of the bottom clamping block. The inner dimensions of the left and right clamping blocks are the same as the dimensions of the reference cable strand, and they are tightly attached to the two sides of the reference cable strand. Circular positioning holes are provided at the bottom ends of the left and right clamping blocks, and at the left and right ends of the bottom clamping block. The circular positioning holes at the left and right ends of the bottom clamping block are connected to the circular positioning holes at the bottom ends of the left and right clamping blocks, respectively, by fastening screws and nuts. The left and right clamping blocks are hinged to the left and right ends of the bottom clamping block in an inverted V-shape. The bottom clamping block has a trapezoidal structure. The connecting device includes a groove, balls, a connecting rod, an adapter, a connecting rod hole, a connecting support rod, and a concave circular groove in the balls. A circular groove running through the center of the bottom clamping block is provided, and a solid ball is placed within the groove. One end of the ball has a concave circular groove with internal threads. The groove is smooth around its edges, ensuring the ball can rotate freely horizontally within it. Directly below the groove is a downward-opening connecting rod hole that communicates with the groove; the diameter of the connecting rod hole is smaller than the diameter of the balls. At the top center of the connecting rod is a connecting support rod with a diameter smaller than the connecting rod hole. The side wall at the top of the connecting support rod has external threads that mate with the concave circular groove in the balls. The connecting support rod passes through the connecting rod hole from bottom to top and connects with the internal threads in the concave circular groove at the bottom of the balls, forming a single unit. The connecting rod remains vertical under gravity. An adapter is installed at the bottom of the connecting rod, and the connecting rod connects to the top of the prism via the adapter.

2. The suspension bridge reference cable strand sag measuring device according to claim 1, characterized in that: The connecting device also includes a level bubble, which is provided on the side of the connecting rod to check the verticality of the connecting rod.

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