CN214583084U - Control target for three-dimensional scanning control measurement of large-span bridge - Google Patents
Control target for three-dimensional scanning control measurement of large-span bridge Download PDFInfo
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- CN214583084U CN214583084U CN202120293298.5U CN202120293298U CN214583084U CN 214583084 U CN214583084 U CN 214583084U CN 202120293298 U CN202120293298 U CN 202120293298U CN 214583084 U CN214583084 U CN 214583084U
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Abstract
The utility model discloses a control target for three-dimensional scanning control measurement of a large-span bridge, which comprises a 360-degree prism, a spherical target and a triangular base; the top of the 360-degree prism is provided with a screw rod which passes through the center of the prism and is arranged along the vertical direction; the bottom of the 360-degree prism is provided with three connecting rods; the spherical target is provided with a connecting hole passing through the sphere center of the spherical target; the spherical target is connected with the top of the screw through the connecting hole; the upper surface of the triangular base is provided with a connecting mechanism used for being connected with the connecting rod, and the triangular base is provided with a leveling mechanism; when the upper surface of the triangular base is adjusted to be horizontal through the leveling mechanism, the sphere center of the spherical target and the prism center of the 360-degree prism are on the same plumb line. The spherical target and the 360-degree prism are arranged in a tandem mode in the plumb line direction, so that the conversion of a coordinate system is simpler, the problem that the spherical target and the 360-degree prism are shielded at certain angles in the horizontal observation direction can be reduced, and the observation dead angle is reduced.
Description
Technical Field
The utility model relates to a building survey and drawing field, concretely relates to be used for three-dimensional scanning control measuring control mark target of large-span bridge.
Background
For engineering projects with wide measuring range and high precision requirements, when three-dimensional laser scanning is adopted for operation, a certain number of control targets are generally distributed in a measuring area, and a total station is adopted to obtain three-dimensional coordinates of the control targets to serve as control points of scanning data. In a general method, a plane target is arranged on a wall or the ground to serve as a control target, but the accuracy of point cloud is sharply reduced when the incident angle of a laser scanning line is greater than 65 degrees. Therefore, in order to ensure the accuracy, the position of the scanner needs to be over against the plane of the target, so that the working efficiency is greatly limited. The conventional spherical target is erected at any position in a scanning mode due to the spherical characteristic, the scanning line incidence angle can be guaranteed to be 0 degrees, the scanning precision of the target can be effectively improved, and the total station cannot measure the central coordinate of the spherical target.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a weak point according to above-mentioned prior art provides a control mark target for large-span bridge three-dimensional scanning control is measured, spherical mark target and 360 degrees prisms of tandem about its adoption utilize the position relation between the two, have realized the parameter conversion of laser scanner coordinate system to control coordinate system.
The utility model discloses the purpose is realized accomplishing by following technical scheme:
a control target for three-dimensional scanning control measurement of a large-span bridge comprises a 360-degree prism, a spherical target and a triangular base;
the top of the 360-degree prism is provided with a screw rod which passes through the center of the prism and is arranged along the vertical direction; the bottom of the 360-degree prism is provided with three connecting rods;
the spherical target is provided with a connecting hole passing through the sphere center of the spherical target; the connecting hole is provided with an internal thread matched with the screw rod; the spherical target is connected with the top of the screw through the connecting hole;
the upper surface of the triangular base is provided with a connecting mechanism used for being connected with the connecting rod, and the triangular base is provided with a leveling mechanism; the setting position of the connecting mechanism and the length of each connecting rod meet the requirement that when the upper surface of the triangular base is adjusted to be horizontal through the leveling mechanism, the sphere center of the spherical target and the prism center of the 360-degree prism are on the same plumb line.
The utility model discloses a further improvement lies in, the length of screw is 3.5 ~ 4.5 cm.
The utility model discloses a further improvement lies in, each the connecting rod encircles the distribution and is in the periphery of the axis extension line of screw rod.
The utility model discloses a further improvement lies in, each the connecting rod with the screw rod is parallel.
The utility model has the advantages that: the control target adopts a 360-degree prism, and the measuring angle of the control target is not limited, so that the total station can select the layout position on the plane of a large structure according to the actual requirement. Under the condition of full sight, the total station and the scanner can accurately measure and control the center coordinates of the target at any angle, so that the measurement simplicity is improved. The spherical target and the 360-degree prism are in a tandem layout in the plumb line direction, and for each observation angle, only fixed height difference exists between the spherical target and the 360-degree prism, so that the conversion of a coordinate system is simpler. By adopting the longitudinal tandem layout, the problem that the spherical target and the 360-degree prism are shielded at certain angles in the horizontal observation direction can be reduced, the observation dead angle is reduced, and the arrangement flexibility of the observation instrument is improved. The control target of this embodiment can be used to the total powerstation and have under the prism operation condition, improved target central point coordinate measurement accuracy.
Drawings
Fig. 1 is a side view of a control target of the present invention;
fig. 2 is a schematic diagram of a control target application process.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example with reference to the accompanying drawings, for the understanding of those skilled in the art:
example (b): as shown in fig. 1, embodiments of the present invention include a control target for large-span bridge three-dimensional scanning control measurement, which includes a 360-degree prism 3, a spherical target 1, and a triangular base. Specifically, the method comprises the following steps:
the top of the 360-degree prism 3 is provided with a screw 2 which passes through the center of the prism and is arranged along the vertical direction. The bottom of the 360-degree prism 3 is provided with three connecting rods 4. The length of the screw 2 is 4 cm. Each connecting rod 4 is distributed around the periphery of the axial extension line of the screw rod 2 and is parallel to the axial extension line of the screw rod 2 so as to stably support the 360-degree prism 3.
The spherical target 1 is provided with a connecting hole (at the bottom of the spherical target 1, not shown in figure 1) passing through the center of the sphere; the connecting hole has an internal thread adapted to the top of the screw 2. The spherical target 1 is connected to the top of the screw 2 through the connecting hole.
The triangular base is an existing device, the upper surface of the triangular base is provided with a connecting mechanism for connecting the connecting rods 4, and the bottom of the triangular base is provided with a leveling mechanism. The setting position of the connecting mechanism and the length of each connecting rod 4 meet the requirement that when the upper surface of the triangular base is adjusted to be horizontal through the leveling mechanism, the sphere center of the spherical target and the prism center of the 360-degree prism 3 are on the same plumb line.
The characteristics enable the coordinates of the 360-degree prism 3 to be measured through the total station in the detection process to serve as the coordinates of the control target in the control coordinate system, and the coordinates of the center of sphere of the spherical target 1 of the control target can be obtained by combining the height difference between the center of sphere of the spherical target and the 360-degree prism 3, so that parameter conversion from the laser scanner coordinate system to the control coordinate system is achieved. The height difference between the prism center of the 360-degree prism 3 and the sphere center of the spherical target 1 can be calibrated in the evaluation field.
In the embodiment, the 360-degree prism 3 is adopted, and the measurement angle is not limited, so that the total station can flexibly select the layout position on the plane of the large structure according to the actual requirement. Under the condition of full sight, the total station and the scanner can accurately measure and control the center coordinates of the target at any angle, so that the measurement simplicity is improved. The spherical target 1 and the 360-degree prism 3 are arranged in a tandem mode in the plumb line direction, and for each observation angle, only fixed height difference exists between the spherical target 1 and the 360-degree prism, so that the conversion of a coordinate system is simpler. By adopting the longitudinal serial layout, the problem that the spherical target 1 and the 360-degree prism 3 are shielded mutually under certain observation angles in the horizontal observation direction can be reduced, the observation dead angle is reduced, and the arrangement flexibility of an observation instrument, particularly a laser scanner, is improved. The control target of this embodiment can be used to the total powerstation and have under the prism operation condition, improved target central point coordinate measurement accuracy.
The use process of the control target of the embodiment comprises the following steps:
(1) as shown in fig. 2, a plurality of spherical targets and the control target of the present embodiment are arranged at intervals on a large structure plane; in the control target layout process, the triangular base of the target needs to be leveled, so that the prism center of the 360-degree prism 3 and the sphere center of the spherical target 1 are positioned on the same plumb line;
(2) when the scanner is used for measurement, the spherical target in the control target is directly scanned, and the target center is automatically identified through point cloud data.
(3) Before the total station instrument measures, the 360-degree prism in the control target is directly measured, and the central coordinate of the prism is recorded.
(4) The conversion between the scanner coordinate system and the total station coordinate system can be realized by measuring more than 2 control targets. The method comprises the following specific steps:
laying 2 control targets in a working scene, as shown in figure 2, the scanners of each station are registered by conventional spherical targets, and simultaneously the scanners respectively scan the control target A and the control target B, and the coordinates of the scanners in the coordinate system are respectively (x)A,yA,zA) And (x)B,yB,zB). The coordinates of the control target under the control coordinate system obtained by the total station are respectively (X)A,YA,ZA) And (X)B,YB,ZB). The conversion parameters of the scanner coordinate system and the control coordinate system can be obtained through a coordinate conversion formula, and the control of scanning data is realized. The coordinate transformation formula is as follows:
in the formula [ X, Y, Z]To control the coordinates of the target in the control coordinate system, [ x, y, z ]]To control the coordinates of the target in the scanner coordinate system, X0,Y0,Z0Alpha is a rotation parameter to be solved, and delta Z is a height difference value between the center of the spherical target and the center of the 360-degree prism in the control target and is a constant.
The above embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A control target for three-dimensional scanning control measurement of a large-span bridge is characterized by comprising a 360-degree prism, a spherical target and a triangular base;
the top of the 360-degree prism is provided with a screw rod which passes through the center of the prism and is arranged along the vertical direction; the bottom of the 360-degree prism is provided with three connecting rods;
the spherical target is provided with a connecting hole passing through the sphere center of the spherical target; the connecting hole is provided with an internal thread matched with the screw rod; the spherical target is connected with the top of the screw through the connecting hole;
the upper surface of the triangular base is provided with a connecting mechanism used for being connected with the connecting rod, and the triangular base is provided with a leveling mechanism; the setting position of the connecting mechanism and the length of each connecting rod meet the requirement that when the upper surface of the triangular base is adjusted to be horizontal through the leveling mechanism, the sphere center of the spherical target and the prism center of the 360-degree prism are on the same plumb line.
2. The control target for the three-dimensional scanning control measurement of the large-span bridge according to claim 1, wherein the length of the screw rod is 3.5-4.5 cm.
3. The control target for the three-dimensional scanning control measurement of the large-span bridge according to claim 1, wherein the connecting rods are distributed around the periphery of the axial extension line of the screw.
4. The control target for three-dimensional scanning control measurement of the large-span bridge according to claim 1, wherein each connecting rod is parallel to the screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120293298.5U CN214583084U (en) | 2021-02-02 | 2021-02-02 | Control target for three-dimensional scanning control measurement of large-span bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120293298.5U CN214583084U (en) | 2021-02-02 | 2021-02-02 | Control target for three-dimensional scanning control measurement of large-span bridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214583084U true CN214583084U (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120293298.5U Active CN214583084U (en) | 2021-02-02 | 2021-02-02 | Control target for three-dimensional scanning control measurement of large-span bridge |
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| Country | Link |
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| CN (1) | CN214583084U (en) |
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2021
- 2021-02-02 CN CN202120293298.5U patent/CN214583084U/en active Active
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| CP01 | Change in the name or title of a patent holder |
Address after: 200093 No. 38 Shui Feng Road, Yangpu District, Shanghai. Patentee after: Shanghai Survey, Design and Research Institute (Group) Co.,Ltd. Address before: 200093 No. 38 Shui Feng Road, Yangpu District, Shanghai. Patentee before: SGIDI ENGINEERING CONSULTING (Group) Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |