A new prism structure for planimetric measurements

Abstract

The utility model discloses a novel prism structure for plane measurement, including tripod (1), vertical three prism structure (2) is provided on tripod (1), three prism structure (2) includes rectangular metal frame (21), and three groups of prisms (22) are arranged vertically in rectangular metal frame (21) inside. This novel prism structure for plane measurement, through increasing two single prisms on the basis of original single prism, fixes three single prisms through rectangular metal frame, makes three single prisms be in same vertical line, and its plane deviation precision can satisfy the development plane control survey, realizes the plane control survey from line to the extension of plane, can solve the demand problem of traditional single prism difficult to measure under the condition that the air quality is poor in tunnel, and the visual condition is limited.

Description

Technical Field

[0001] This utility model relates to the field of planar measurement technology, and in particular to a novel prism structure for planar measurement. Background Technology

[0002] Currently, in tunnel construction, measuring prisms are used as reflectors for distance measurement. The reflecting prism receives the light signal emitted by the total station and reflects it back. The total station emits a light signal and receives the light signal reflected back by the measuring prism, calculates the axial displacement of the light signal, and thus indirectly determines the time it takes for the light to travel. Finally, the distance from the total station to the measuring prism is measured.

[0003] CN210462299U discloses a utility model patent entitled "A Measuring Prism," which includes: a bracket, an adjustment platform on the bracket, a prism mounting bracket mounted on the adjustment platform, a prism lens that can be rotated up and down around a rotating axis on the prism mounting bracket, and an indicator plate fixed on the prism lens; a pitch adjustment device is provided at one end of the rotating axis, the pitch adjustment device including: a gear disk connected to the prism lens, a central rotating shaft coaxially inserted with the gear disk, the central rotating shaft and the gear disk being connected via a spline, a coarse adjustment dial connected to the central rotating shaft, a fine adjustment gear meshing on the gear disk, and a fine adjustment dial connected to the fine adjustment gear.

[0004] While this type of prism can be used for distance measurement, it is impossible to conduct measurements properly using a single prism when the air quality inside the tunnel is poor. Measurements in such environments require enhanced ventilation to improve air quality and ensure measurement accuracy; however, this is particularly challenging for long tunnels. Utility Model Content

[0005] The purpose of this invention is to provide a novel prism structure for planar measurement, which can solve the problem of not being able to carry out traverse measurement work normally under poor air environment conditions in tunnels.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a novel prism structure for planar measurement, comprising a tripod, on which a prism structure is vertically mounted; the prism structure comprises a rectangular metal frame, within which three sets of prisms are vertically arranged.

[0007] The prism includes a prism base and a prism body. The prism base is U-shaped, and the prism body is disposed inside the prism base. The prism base is movably disposed within a rectangular metal frame.

[0008] To further describe, both sides of the prism holder are connected to a rectangular metal frame via rotating shafts.

[0009] To facilitate connection with the tripod, a connecting platform is provided on the prism base at both the top and bottom of the rectangular metal frame, and an installation thread is provided in the connecting platform.

[0010] A connecting rod is fixedly installed on the tripod, and the connecting rod is threaded; the connecting rod passes through the connecting platform and is connected to the prism structure through the thread.

[0011] To improve measurement accuracy, the distance between the centers of adjacent prism bodies is 12.5 cm.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This novel prism structure for plane measurement adds two prisms to the original single prism and fixes the three prisms with a rectangular metal frame to form a triangular prism structure, so that the three prisms are on the same vertical line. Its plane deviation accuracy can meet the requirements for carrying out plane control measurement, realizing the expansion of plane control measurement from line to surface. It can solve the problem that traditional single prisms are difficult to use for measurement in situations where the air quality is poor and the visibility is limited in tunnels. By applying this triangular prism structure, the efficiency of traverse measurement can be improved. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0014] Figure 1 This is a frontal perspective view of the present invention;

[0015] Figure 2 This is a frontal perspective view of the triangular prism structure in this utility model;

[0016] Figure 3 This is a front view of the triangular prism structure in this utility model. Detailed Implementation

[0017] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0018] Please see Figure 1-3 This utility model provides a technical solution: a novel prism structure for plane measurement, including a tripod 1, on which a prism structure 2 is vertically arranged; the prism structure 2 includes a rectangular metal frame 21, and three sets of prisms 22 are vertically arranged inside the rectangular metal frame 21.

[0019] The prism 22 includes a prism base 221 and a prism body 222. The prism base 221 is U-shaped, and the prism body 222 is disposed inside the prism base 221. The prism base 221 is movably disposed within a rectangular metal frame 21.

[0020] To facilitate the rotation of the prism and adjustment of its angle, both sides of the prism base 221 are connected to the rectangular metal frame 21 via a rotating shaft 23.

[0021] To facilitate the connection of the tripod, a connecting platform 24 is provided on the prism base at both the top and bottom ends of the rectangular metal frame, and an installation thread 25 is provided in the connecting platform 24.

[0022] A connecting rod 3 is fixedly installed on the tripod 1, and the connecting rod is threaded; the connecting rod 3 passes through the connecting platform 24 and is connected to the triangular prism structure 2 by the thread.

[0023] The distance between the centers of adjacent prism bodies (222) is 12.5 cm.

[0024] Working principle: Three prisms 22 are arranged with a center distance of 12.5cm. A rectangular metal frame 21 with a length of 33cm, a width of 3cm, and a thickness of 0.8cm is used to fix the two sides of the prisms 22 with rivets 23 to form a triangular prism structure 2. Both ends of the triangular prism structure 2 can be fixed to the tripod 1 with buckles 24. After the triangular prism structure 2 is fixed to the tripod 1, multiple observations are carried out in the cave by moving the two prism structures (single prism structure and triangular prism structure 2) to 270m, 315m, and 360m of the total station to obtain the horizontal horizontal direction and average horizontal distance of various prisms at the corresponding measurement range. By comparing the measurement data deviations of the single prism structure and the triangular prism structure 2 under different distance conditions, it is determined that after meeting the accuracy requirements in horizontal measurement, the triangular prism structure 2 can replace the single prism in plane control measurement.

[0025] The processed triangular prism structure 2 was compared and verified with the single prism inside the tunnel. Due to the complex environment inside the tunnel, the experiment was conducted while ensuring that the environment inside the tunnel was basically stable. The total station, the single prism, and the triangular prism structure 2 were all placed on a stable tripod 1. The measurement distance was changed by moving the single prism and the triangular prism structure 2. The experiment was conducted by placing the single prism and the triangular prism structure 2 at three locations: 270m, 315m, and 360m.

[0026] Table 1-1 Record of horizontal observation values ​​and horizontal distance of the new prism structure and single prism in the tunnel

[0027]

[0028] Table 1-2 Comparison of horizontal direction observations and horizontal distance between the new prism structure and single prism in the tunnel.

[0029]

[0030] As shown in Table 1-2 above, when measuring inside the tunnel, the maximum horizontal deviation of the total station when aiming at the single prism is 0.7″, which is less than the limit of 4″, and the maximum horizontal distance deviation is 0.9mm, which is less than the limit of 4mm. When aiming at the triangular prism structure 2, the maximum horizontal deviation is 1.5″, which is less than the limit of 4″, and the maximum horizontal distance deviation is 0.6mm, which is less than the limit of 4mm. Therefore, the triangular prism structure 2 can replace the single prism when conducting plane control measurements inside the tunnel.

[0031] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A new prism structure for planimetric measurements, comprising a tripod (1), characterized in that: A prism structure (2) is vertically mounted on the tripod (1); the prism structure (2) includes a rectangular metal frame (21), and three sets of prisms (22) are vertically arranged inside the rectangular metal frame (21).

2. The novel prism structure for planar measurement according to claim 1, characterized in that: The prism (22) includes a prism base (221) and a prism body (222). The prism base (221) is U-shaped, and the prism body (222) is disposed inside the prism base (221). The prism base (221) is movably disposed inside a rectangular metal frame (21).

3. The novel prism structure for planar measurement according to claim 2, characterized in that: Both sides of the prism holder (221) are connected to the rectangular metal frame (21) via a rotating shaft (23).

4. The novel prism structure for planar measurement according to claim 3, characterized in that: A connecting platform (24) is provided on the prism seat located at both ends of the rectangular metal frame, and an installation thread (25) is provided in the connecting platform (24).

5. The novel prism structure for planar measurement according to claim 4, characterized in that: A connecting rod (3) is fixedly installed on the tripod (1), and a thread is provided on the connecting rod; the connecting rod (3) passes into the connecting platform (24) and is connected to the prism structure (2) by the thread.

6. The novel prism structure for plane measurement according to claim 5, characterized in that: The distance between the centers of adjacent prism bodies (222) is 12.5 cm.

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