Prism device for contact survey of coordinate azimuth angle of deep foundation pit

Abstract

The invention, which relates to the technical field of deep foundation pit engineering surveying, discloses a prism device for deep foundation pit coordinate azimuth angle contact survey, the prism device comprises an omnidirectional reflection prism group, and the omnidirectional reflection prism group is composed of a plurality of single prism sheets arranged according to a regular icosahedron chamfer configuration; the surface of the single prism sheet is plated with a wide-spectrum antireflection film with the wave band of 532-1550 nm, and the single prism sheet is used for achieving omnidirectional reflection on the horizontal plane; the number of the protective covers is two, the two protective covers are located on the upper side and the lower side of the omnidirectional reflection prism in a central symmetry mode respectively, and positioning grooves matched with the edge of the single prism sheet are formed in the protective covers; wherein the center of the protective cover is also provided with a circular jack; the capillary supporting rod is vertically arranged in the middle of the omnidirectional reflecting prism group, and two ends of the capillary supporting rod are respectively positioned in the circular insertion holes in the centers of the two protective covers; the prism device can be used for 360-degree dead-angle-free measurement, and the measurement working efficiency and precision are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of deep foundation pit engineering measurement, in particular to a prism device for coordinate azimuth angle connection measurement of deep foundation pit. BACKGROUND

[0002] As the core technology of unifying the space reference of deep foundation pit engineering, the connection measurement technology is derived from the safety demand and technological innovation of urban underground space development. The traditional measurement methods (total station traverse method, laser point projection method and steel wire hanging method) have limitations in precision and efficiency, which are difficult to meet the modern engineering demand. With the acceleration of urban modernization process, intercity long-distance and large-buried-depth tunnels and underground space development have become the focus of urban planning, which puts forward higher requirements for measurement technology. In order to improve the long and large tunnel penetration accuracy, it is urgent to develop a new type of measurement device to realize the rapid and accurate transmission of coordinate azimuth angle, which is of great significance to ensure the engineering quality and safety. SUMMARY

[0003] In view of the shortcomings of the prior art, the present application provides a prism device for coordinate azimuth angle connection measurement of deep foundation pit, which solves the core problems of long time consumption, manual observation and environmental disturbance sensitivity in traditional deep foundation pit connection measurement.

[0004] To achieve the above purpose, the following technical scheme is adopted: a prism device for coordinate azimuth angle connection measurement of deep foundation pit, comprising an omnidirectional reflection prism group, the omnidirectional reflection prism group is composed of a plurality of single prism pieces arranged in a regular icosahedron angle cutting configuration; The single prism piece is coated with a 532nm-1550nm waveband wide spectrum anti-reflection film on its surface, which is used to realize omnidirectional reflection of the horizontal plane; The protective cover is provided with two center-symmetrical protective covers located on the upper and lower sides of the omnidirectional reflection prism respectively, and the inside of the protective cover is provided with a positioning groove matched with the edge of the single prism piece; The center of the protective cover is also provided with a circular insertion hole; The capillary tube support rod is vertically arranged in the middle of the omnidirectional reflection prism group, and the two ends thereof are located in the circular insertion holes in the centers of the two protective covers respectively.

[0005] Optionally, the single prism piece is provided with six pieces.

[0006] Optionally, the optical axis included angle of adjacent single prism pieces in the omnidirectional reflection prism group is 60°±0.5', and the surface roughness Ra of the reflection surface is ≤0.01μm, so that the angle measurement error of the total station in any azimuth angle is ≤±1".

[0007] Optionally, the protective cover is made of stainless steel alloy, and the middle part of the protective cover is provided with a convex curved surface structure. The circular insertion hole has a diameter of 0.3mm to 0.5mm, and the outer surface is treated by a sand blasting process.

[0008] Optionally, the circular insertion hole has a diameter tolerance of ±0.02mm, which is used for isolating external contaminants and maintaining the optical performance of the omnidirectional reflection prism group.

[0009] Optionally, the prism group and the protective cover are integrally connected by AB type high-strength epoxy adhesive curing, and the shear strength of the adhesive layer is greater than or equal to 15MPa.

[0010] Optionally, the capillary support rod is made of 304 stainless steel.

[0011] The present application provides a prism device for deep foundation pit coordinate azimuth contact measurement, which has the following beneficial effects: Compared with the traditional reflection patch, the prism device for deep foundation pit coordinate azimuth contact measurement effectively improves the measurement distance by more than 300%, breaks through the single direction measurement limit, realizes 360° dead angle observation, and the measurement accuracy reaches the sub-millimeter level (±0.3mm); in terms of engineering efficiency, the single station measurement time is reduced from 30min to 5min, and the automatic observation mode of the total station is supported, which has high automation degree, small interference from external factors, strong environmental adaptability; the 304 stainless steel support structure is adopted to ensure that it does not deform during long-term use, has good structural stability, the double protective cover design can effectively prevent construction damage, has excellent protection performance, and the standardized design is convenient for on-site rapid deployment and installation. The device is especially suitable for large buried depth (>50m) foundation pit engineering and long distance (>10km) tunnel through. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The present application is a single prism sheet for the deep foundation pit contact measurement prism device combination.

[0013] Figure 2 The present application is a capillary support rod for the deep foundation pit contact measurement prism device combination.

[0014] Figure 3 The present application is a prism alloy protective cover for the deep foundation pit contact measurement prism device combination.

[0015] Figure 4 The present application is a front view of the completed deep foundation pit contact measurement prism device.

[0016] Figure 5 The present application is a top view of the completed deep foundation pit contact measurement prism device.

[0017] Figure 6 The present application is a side view of the completed deep foundation pit contact measurement prism device.

[0018] In the figure: 1, single prism sheet; 2, capillary support rod; 3, protective cover. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0020] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] Please refer to Figures 1 to 6 , the present application provides a technical scheme: a prism device for coordinate azimuth contact measurement of deep foundation pit, which comprises an omnidirectional reflection prism group, the omnidirectional reflection prism group is composed of a plurality of single prism sheets 1 arranged in a regular icosahedral angle cutting configuration; The single prism sheet 1 is coated with a 532nm-1550nm waveband wide spectrum antireflection film on its surface, which is used to realize omnidirectional reflection of the horizontal plane; The protective cover 3 is provided with two center-symmetrical protective covers 3, which are respectively located on the upper and lower sides of the omnidirectional reflection prism, and the inside of the protective cover 3 is provided with a positioning groove matched with the edge of the single prism sheet 1; Among them, the center of the protective cover 3 is also provided with a circular insertion hole; The capillary support rod 2 is vertically arranged in the middle of the omnidirectional reflection prism group, and the two ends thereof are respectively located in the circular insertion hole in the center of the two protective covers 3.

[0023] In this embodiment, as shown in Figure 1 , Figure 4 , Figure 5 and Figure 6 , the single prism sheet 1 is provided with six.

[0024] In this embodiment, as shown in Figure 1 , Figure 4 , Figure 5 and Figure 6 , the angle between the optical axes of adjacent single prism sheets 1 in the omnidirectional reflecting prism group is 60°±0.5', and the surface roughness Ra of the reflecting surface is ≤0.01μm, so that the angle measurement error of the total station in any azimuth is ≤±1".

[0025] In this embodiment, as shown in Figure 3 , Figure 4 , Figure 5 and Figure 6 , the protective cover 3 is made of stainless steel alloy, and the middle part of the protective cover 3 is in a convex curved surface structure. The diameter of the circular insertion hole is 0.3mm-0.5mm, and the outer surface is treated by sand blasting process.

[0026] In this embodiment, as shown in Figure 3 and Figure 5 , the aperture tolerance of the circular insertion hole is ±0.02mm, which is used to isolate external pollutants and maintain the optical performance of the omnidirectional reflecting prism group.

[0027] In this embodiment, the prism group 1 and the protective cover 3 are integrally connected by AB type high-strength epoxy adhesive curing, and the shear strength of the bonding layer is ≥15MPa.

[0028] In this embodiment, as shown in Figure 2 , Figure 4 and Figure 6 , the capillary support rod 2 is made of 304 stainless steel.

[0029] The use method of the present application: the prism device for coordinate azimuth contact measurement of deep foundation pit, in use, the working process is as follows: The device adopts modular design, and the core is a hollow hourglass-shaped omnidirectional reflecting prism group formed by precisely bonding 6 pieces of 20mm high K9 optical glass single prism sheets 1, and an integral body with reflecting prism sheets on four sides is formed after the combination of the 6 pieces of single prism sheets 1, so that the instrument can measure accurate data by emitting laser to any prism sheet through light refraction to the center of the combination, and realize 360° dead angle-free measurement. A Φ0.3-0.5mm circular insertion hole is drilled at the center of the omnidirectional reflecting prism group and a 0.2mm thick capillary support rod 2 is inserted, and a stable measurement reference axis is formed by using structural adhesive to fix it. Finally, the protective cover 3 with a circular insertion hole is installed on the upper and lower end surfaces of the single prism sheet 1, and the overall coaxiality is ≤0.05mm by means of secondary positioning process.

[0030] The prism device can realize 360-degree omnidirectional reflection characteristics, strong wind pressure resistance (8 levels, 30 m / s), wide working temperature range (-20 DEG C to 60 DEG C); meanwhile, the device has exquisite structure, high precision and strong environmental adaptability, and significantly improves the reliability and precision of the deep foundation pit engineering connection measurement scheme and the invention concept thereof is replaced or changed equivalently, which should be covered in the protection scope of the present application.

[0031] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art in the technical range disclosed by the present application, according to the technical scheme and the invention concept of the present application, equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A prism device for coordinate azimuth tie surveying of deep foundation pits, characterized in that, The omnidirectional reflection prism group is composed of a plurality of single prism sheets (1) arranged in a regular icosahedron cut angle configuration. The single prism sheet (1) is coated with a 532nm-1550nm wide spectrum antireflection film on the surface to realize omnidirectional reflection on the horizontal plane. Two protective covers (3) are provided and are symmetrically arranged on the upper and lower sides of the omnidirectional reflection prism, and the interior of the protective cover (3) is provided with a positioning groove matched with the edge of the single prism sheet (1). A circular insertion hole is further provided at the center of the protective cover (3). The capillary support rod (2) is vertically arranged at the middle of the omnidirectional reflection prism group, and the two ends are respectively located in the circular insertion hole at the center of the two protective covers (3).

2. The prism device for coordinate azimuth connection surveying of deep foundation pit according to claim 1, characterized in that: The single prism sheet (1) is provided with six.

3. The prism device for coordinate azimuth connection surveying of deep foundation pit according to claim 1, characterized in that: The optical axis angle between adjacent single prism sheets (1) in the omnidirectional reflection prism group is 60°±0.5', and the surface roughness Ra of the reflection surface is ≤0.01μm.

4. The prism device for coordinate azimuth connection surveying of deep foundation pit according to claim 1, characterized in that: The protective cover (3) is made of stainless steel alloy, and the middle part of the protective cover (3) is a convex curved surface structure. The diameter of the circular insertion hole is 0.3mm-0.5mm, and the outer surface is treated by sand blasting process.

5. The prism device for coordinate azimuth connection surveying of deep foundation pit according to claim 1, characterized in that: The aperture tolerance of the circular insertion hole is ±0.02mm, which is used to isolate external pollutants and maintain the optical performance of the omnidirectional reflection prism group.

6. The prism apparatus for coordinate azimuth tie surveying of deep foundation pit according to claim 1, characterized in that: The prism group (1) and the protective cover (3) are integrally connected by AB type high-strength epoxy adhesive curing, and the shear strength of the adhesive layer is ≥15MPa.

7. The prism apparatus for coordinate azimuth connection surveying of deep foundation pit according to claim 1, characterized in that: The capillary support rod (2) is made of 304 stainless steel.

Images