A point-throwing centering tool for GNSS surveying

Abstract

The utility model relates to a kind of for the point of GNSS measurement is projected and is centered tool, including first bottom plate, second bottom plate, sliding table and pedestal connected in sequence, the first bottom plate is fixedly connected with observation pier, the side of sliding table is provided with first bolt adjusting assembly and second bolt adjusting assembly, and the first bottom plate, the second bottom plate, the sliding table and the pedestal are provided with concentric coaxial sight hole.The utility model can flexibly match different sizes, different height observation pier, can be adapted to include optical theodolite, point of projection instrument and tracker and other various equipment's point of projection and is centered measurement, can also be locked after completing point of projection and is centered, ensure that observation position does not produce running in the measurement process, to improve measurement accuracy, reduce workload and environmental interference.

Description

Technical Field

[0001] This utility model relates to the field of point projection and alignment technology in engineering surveying, and more specifically to a point projection and alignment tool for GNSS surveying. Background Technology

[0002] In the primary ground network measurement of the accelerator device, the accelerator device is installed in an underground tunnel, and the primary ground network is laid out on the roof. Before conducting GNSS control network measurement, it is necessary to align the rooftop GNSS equipment with the control points in the underground tunnel.

[0003] GNSS equipment typically uses a standard tripod provided by the manufacturer for centering. These tripods are lightweight and easily moved due to environmental factors. Therefore, during long-term static GNSS observations, human supervision is required to prevent interference from environmental vibrations and other factors, thus increasing the workload of GNSS field measurements and the requirements for the surrounding observation environment. Accelerator control networks require high precision. To ensure the accuracy of point projection and centering before GNSS measurements, the designed centering platform needs to be capable of centering measurements using multiple instruments, including trackers, optical point projectors, and theodolites, to verify the accuracy of the centering measurements. Based on these requirements, a point projection and centering fixture for GNSS observations was designed. Utility Model Content

[0004] To address the problems in the prior art, this invention provides a point-alignment tool for GNSS measurements, which is easy to adjust and highly adaptable, and can improve measurement accuracy, reduce workload, and reduce environmental interference.

[0005] This utility model provides a point centering fixture for GNSS measurement, comprising a first base plate, a second base plate, a slide table, and a base connected in sequence. The first base plate is fixedly connected to the observation pier. The slide table is provided with a first bolt adjustment assembly and a second bolt adjustment assembly on its side. The first base plate, the second base plate, the slide table, and the base are provided with concentric and coaxial viewing holes.

[0006] Furthermore, the slide table includes a first slide table structure, a second slide table structure, and a third slide table structure, which are connected sequentially by a dovetail groove structure.

[0007] Furthermore, the first slide structure has a first inner dovetail groove, the second slide structure has a first outer dovetail groove and a second inner dovetail groove, and the third slide structure has a second outer dovetail groove. The first inner dovetail groove is connected to the first outer dovetail groove, and the second inner dovetail groove is connected to the second outer dovetail groove.

[0008] Furthermore, both the first bolt adjusting assembly and the second bolt adjusting assembly include a round shank adjusting screw and an adjusting block, wherein the round shank adjusting screw and the adjusting block are slidably connected through a threaded hole.

[0009] Furthermore, the first base plate is provided with a first threaded hole, and the first base plate is fixedly connected to the observation pier through the first threaded hole.

[0010] Furthermore, the second base plate is fixed to the first base plate by the first bolt.

[0011] Furthermore, a second bolt is provided at the bottom of the first slide structure, and the second bolt securely connects the first base plate, the second base plate, and the first slide structure in sequence.

[0012] Furthermore, the base has a second threaded hole, and the base is fixed above the third slide structure by a third bolt.

[0013] Furthermore, a base and a base rod are fixed on the second threaded hole. A tracking reflector ball is placed at the bottom of the base rod for centering measurement of the tracking instrument, or an optical projector is placed on the base for centering measurement of the optical projector.

[0014] Furthermore, the second base plate is provided with a third threaded hole for fixing the customized bracket, on which a tool theodolite is placed for the point centering measurement of the tool theodolite.

[0015] The point-projection and centering fixture provided by this utility model can be flexibly matched with observation piers of different sizes and heights during GNSS control network measurement. It is compatible with various equipment such as trackers, optical point projectors, and tool theodolites for point-projection and centering measurement. It can also be locked after point-projection and centering to ensure that the observation position does not move during the measurement process, thereby improving measurement accuracy and reducing workload and environmental interference. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the centering fixture for GNSS measurement according to this utility model.

[0017] Figure 2 yes Figure 1 A magnified view of a section of the middle sliding stage.

[0018] Figure 3 yes Figure 1 Bottom view of the middle sliding platform. Detailed Implementation

[0019] To make the objectives, solutions, and advantages of this utility model clearer, the specific structure and working principle of this utility model will be described in more detail below with reference to the accompanying drawings. The embodiments described are only for explaining this utility model and are not limited to these embodiments, nor are they intended to limit the scope of application of this utility model.

[0020] The purpose of the following content is to provide the public with a clearer understanding of this utility model. However, those skilled in the art can clearly understand this utility model even without the following detailed description.

[0021] This invention provides a centering fixture for GNSS measurements. Before GNSS observation, the fixture can be adjusted and fixed by the opposite screws to achieve centering from the rooftop of a building to the underground control point. This ensures the long-term stability of the rooftop centering device while guaranteeing the accuracy of GNSS measurements.

[0022] Specifically, such as Figures 1-3 As shown, the centering fixture provided by this utility model includes a first base plate 1, a second base plate, a slide consisting of a first slide structure 5, a second slide structure 6, and a third slide structure 7, and a base 17 with a threaded hole 19.

[0023] More specifically, a first threaded hole 2 is provided on the first base plate 1, through which it is fixedly connected to the GNSS observation pier. The second base plate 3 is fixed to the first base plate 1 by a first bolt 4, and a second bolt 22 is provided at the bottom of the first sliding platform structure 5, which sequentially fixes the first base plate 1, the second base plate 3, and the first sliding platform structure 5.

[0024] The first slide structure 5, the second slide structure 6, and the third slide structure 7 are connected sequentially by dovetail groove structures. Specifically, the first slide structure 5 has a first inner dovetail groove, the second slide structure 6 has a first outer dovetail groove and a second inner dovetail groove, and the axes of the first outer dovetail groove and the second inner dovetail groove are perpendicular to each other. The third slide structure 7 has a second outer dovetail groove. The first inner dovetail groove of the first slide structure 5 is connected to the first outer dovetail groove of the second slide structure 6, and the second inner dovetail groove of the second slide structure 6 is connected to the second outer dovetail groove of the third slide structure 7, thereby enabling the three slide structures to cooperate.

[0025] The aforementioned inner and outer dovetail grooves are integrally cut, one-piece structures, such as... Figure 2 As shown, the first slide structure 5 and the second slide structure 6 are connected by the dovetail groove structure 20, and the second slide structure 6 and the third slide structure 7 are connected by the dovetail groove structure 21.

[0026] The second slide structure 6 is used to realize the movement of the centering fixture in the Y direction. It includes two first bolt adjusting assemblies 12-13 / 14-15 arranged on opposite sides. The first bolt adjusting assembly includes a first round shank adjusting screw 12 / 14 and a first adjusting block 13 / 15 with a threaded hole. The third slide structure 7 is used to realize the movement of the centering fixture in the X direction. It includes two second bolt adjusting assemblies 8-9 / 10-11 arranged on opposite sides. The second bolt adjusting assembly includes a second round shank adjusting screw 8 / 10 and a second adjusting block 9 / 11 with a threaded hole. During centering measurements, the X-direction adjustment is achieved using the round-handle adjusting screws 8 / 10 on both sides of the third slide structure 7. The round-handle adjusting screws 8 / 10 and their corresponding adjusting blocks 9 / 11 are screwed together. After tightening the screws on both ends of the third slide structure 7, the X-direction is fixed. The Y-direction adjustment is achieved using the round-handle adjusting screws 12 / 14 on both sides of the second slide structure 6. The round-handle adjusting screws 12 / 14 and their corresponding adjusting blocks 13 / 15 are screwed together. After adjustment, the screws 12 / 14 are tightened on both ends of the second slide structure 6, thus fixing the Y-direction and ensuring that the observation position does not shift during subsequent measurements.

[0027] A base 17 with a second threaded hole 19 is provided above the third slide structure 7 for connecting the centering fixture and the GNSS equipment. Specifically, firstly, the second threaded hole 19 can fix the large-diameter base and the base rod. The bottom of the base rod can be placed on the reflector ball of the tracker for centering measurement of the tracker's projection point. At the same time, an optical projector can be placed on the large-diameter base for centering measurement of the projector. After the centering measurement is completed, the GNSS equipment can be placed on the base for GNSS measurement.

[0028] The first base plate 1, the second base plate 3, and the center of the first sliding platform structure 5, the second sliding platform structure 6, the third sliding platform structure 7, and the base 17 are all provided with circular viewing holes 16, and the centers of each circular viewing hole 16 are coaxial with the center of the viewing hole reserved for GNSS measurement centering, so as to ensure the line of sight with the underground control point during centering measurement.

[0029] In actual measurements, to adapt to the site environment and facilitate measurement, observation piers of different heights and sizes are often designed. These piers have viewing holes in the middle that lead directly to the ground at the projection point. The centering fixture of this invention is fixed above the observation pier by a first base plate 1 and a first threaded hole 2. The circular viewing hole 16 is aligned with the viewing hole of the observation pier, thereby achieving centering adjustment on observation piers of different sizes and heights.

[0030] In this embodiment, a third threaded hole 18 is also provided on the second base plate 3 for fixing a custom bracket. The custom bracket can hold a tool theodolite for the application and verification of various point centering methods.

[0031] This utility model achieves centering adjustment in two directions through a sliding table structure and its opposite bolt adjustment assembly. It connects to the GNSS through the second threaded hole 19 at the top and achieves centering line of sight with the control point through the reserved viewing hole in the middle. In the design of the GNSS static observation control network, the centering adjustment fixture of this utility model can be flexibly matched with observation piers of different heights. After the point is centered, the fixture is locked to ensure that the observation position does not move during the measurement process.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various variations can be made to the above embodiments of this utility model. That is, all simple and equivalent changes and modifications made based on the claims and description of this utility model application fall within the protection scope of the claims of this utility model patent. Any aspects of this utility model not described in detail are conventional technical content.

Claims

1. A point-projection centering fixture for GNSS surveying, which is a rooftop centering device, characterized in that, The system includes a first base plate, a second base plate, a sliding platform, and a base connected in sequence. The first base plate is fixedly connected to the observation pier. The sliding platform is provided with a first bolt adjustment assembly and a second bolt adjustment assembly on its side. The first base plate, the second base plate, the sliding platform, and the base are provided with concentric and coaxial viewing holes. The viewing holes are coaxial with the viewing holes reserved for GNSS measurement centering. The viewing holes are used to ensure visibility with underground control points during centering measurement. The slide table includes a third slide table structure. The base has a second threaded hole, and the base is fixed above the third slide table structure by a third bolt. A base and a base rod are fixed on the second threaded hole. A tracking reflector ball is placed at the bottom of the base rod for centering measurement of the tracking instrument, or an optical projector is placed on the base for centering measurement of the optical projector. After the centering measurement from the building roof to the underground control point is completed, a GNSS device is placed on the base for GNSS measurement.

2. The point-projection and centering fixture for GNSS surveying according to claim 1, characterized in that, The slide table also includes a first slide table structure and a second slide table structure, and the first slide table structure, the second slide table structure and the third slide table structure are connected in sequence by a dovetail groove structure.

3. The point-projection and centering fixture for GNSS surveying according to claim 2, characterized in that, The first slide structure has a first inner dovetail groove, the second slide structure has a first outer dovetail groove and a second inner dovetail groove, and the third slide structure has a second outer dovetail groove. The first inner dovetail groove is connected to the first outer dovetail groove, and the second inner dovetail groove is connected to the second outer dovetail groove.

4. The point-projection and centering fixture for GNSS measurement according to claim 1, characterized in that, Both the first bolt adjusting assembly and the second bolt adjusting assembly include a round shank adjusting screw and an adjusting block, wherein the round shank adjusting screw and the adjusting block are slidably connected through a threaded hole.

5. The point-projection and centering fixture for GNSS surveying according to claim 1, characterized in that, The first base plate is provided with a first threaded hole, and the first base plate is fixedly connected to the observation pier through the first threaded hole.

6. The point-projection and centering fixture for GNSS surveying according to claim 2, characterized in that, The second base plate is fixed to the first base plate by the first bolt.

7. The point-projection and centering fixture for GNSS surveying according to claim 2, characterized in that, The bottom of the first slide structure is provided with a second bolt, which sequentially fixes the first base plate, the second base plate, and the first slide structure together.

8. The point-projection and centering fixture for GNSS surveying according to claim 1, characterized in that, The second base plate is provided with a third threaded hole for fixing the custom bracket, on which a tool theodolite is placed for the point centering measurement of the tool theodolite.

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