Detachable survey mark

Abstract

The utility model discloses a detachable measuring mark, which comprises a cylindrical fixed end and a connecting screw rod, the middle of the bottom end of the fixed end is provided with a non-through connecting hole, the bottom end of the side wall of the connecting hole is provided with a threaded opening, and the two ends of the fixed end are symmetrically provided with a pair of notch groove groups. The notch groove set comprises a section of annular notch groove and four linear notch grooves perpendicular to the center line, the two ends of each linear notch groove stop at the annular notch groove and a nearby port of the fixing end respectively, the connecting threaded rod comprises a connecting end and an exposed end, the connecting end is fixedly connected to the top end of the exposed end, and the connecting end can completely enter the connecting hole. The bottom end of the connecting end is provided with a thread matched with the threaded opening, and the bottom end of the exposed end is fixedly connected with a centering mark, so that the problems that an existing survey mark for mines and tunnels is inconvenient in point burying, large in occupied space, incapable of being stored and used for a long time, large in measurement error and capable of affecting the reliability of observation results are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring tools, in particular to a detachable measuring mark. Background Art

[0002] Survey marks are signs, sighting boards and other markers used for measurement that calibrate the position of ground survey control points. Currently, survey marks are used in many fields and there are many types. Common ones include: mandatory observation piers, ordinary concrete marks, and tunnel roof alignment marks. Currently, for mines and tunnels, the commonly used survey marks are mostly long stick-shaped objects. It is not easy to operate long objects directly inserted into the wall. There may be deviations during operation, which will cause errors in subsequent measurement results. Moreover, after being inserted into the wall, they will not move until they are scrapped and replaced. Because most of the survey mark body is exposed and the environment of mines and tunnels is harsh, the survey mark is easily damaged. In short, the existing survey marks for mines and tunnels have the disadvantages of inconvenient burial points, large space occupation, inability to be stored and used for a long time, large measurement errors, and affecting the reliability of observation results. Utility Model Content

[0003] The utility model is intended to provide a detachable survey mark to solve the problems of existing survey marks for mines and tunnels being inconvenient to bury, occupying a large space, being unable to be stored and used for a long time, having large measurement errors, and affecting the reliability of observation results.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a detachable measuring mark, comprising a fixed end and a connecting screw rod, the fixed end is cylindrical, a non-through connecting hole is opened in the middle of the bottom end of the fixed end, a thread opening is opened at the bottom end of the side wall of the connecting hole, a pair of groove groups are symmetrically opened at both ends of the fixed end, the groove group comprises a section of annular groove and four straight grooves arranged perpendicular to the center line, the two ends of the straight groove respectively terminate at the annular groove and the nearest port of the fixed end, the connecting threaded rod comprises a connecting end and an exposed end, the connecting end is fixedly connected to the top end of the exposed end, the connecting end can fully enter the connecting hole, the bottom end of the connecting end is provided with a thread matching the thread opening, the bottom end of the exposed end is fixedly connected to a centering mark, the free end of the centering mark is hemispherical, and two cross-shaped silk lines are engraved at the center position of the centering mark.

[0005] Preferably, the fixed end and the connecting screw are both made of 304 stainless steel.

[0006] Preferably, the diameter of the connecting hole is two-thirds of the diameter of the fixed end.

[0007] Preferably, a single groove group occupies a quarter of the fixed end.

[0008] Preferably, the exposed end is 5 to 7 times the length of the connecting end.

[0009] Preferably, the centering mark diameter is the same as the exposed end diameter.

[0010] The principle and beneficial effects of this technical solution:

[0011] (1) Drill a hole in the wall and bury the fixed end to bury the point, which is simple.

[0012] (2) It can be buried at any position below 1.4m in wall height, with flexible location selection, which can overcome the impact of narrow underground space.

[0013] (3) During the measurement process, it can save space and not affect the normal passage of vehicles, thereby reducing the impact on traffic and improving work efficiency.

[0014] (4) The points are set on the wall, which is not easily contaminated by dirt and debris, and is easy to maintain and preserve for a long time.

[0015] (5) The point is stable, not easily damaged by construction, and can provide stable point data.

[0016] (6) The connecting rods can be reused.

[0017] (7) It has strong anti-interference ability and can overcome the adverse factors of wind flow and vibration in underground projects, thus improving measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a detachable measurement mark provided in an embodiment of the utility model;

[0019] Figure 2 AA schematic diagram of a detachable measurement mark provided in an embodiment of the utility model;

[0020] Figure 3 A BB schematic diagram of a detachable measurement mark provided in an embodiment of the utility model;

[0021] In the figure: 1. Fixed end; 2. Connecting screw; 3. Connecting hole; 4. Annular groove; 5. Straight groove; 6. Connecting end; 7. Thread; 8. Centering mark; 9. Silk thread. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings and implementation modes:

[0023] like Figure 1A detachable measuring mark shown in the figure comprises a fixed end 1 and a connecting screw 2, the fixed end 1 is cylindrical, 200 mm long and 30 mm in diameter, a non-through connecting hole 3 with a diameter of 20 mm is opened in the middle of the bottom end of the fixed end 1, a thread opening with a length of 50 mm and a depth of 0.5 mm is opened at the bottom end of the side wall of the connecting hole 3, a pair of groove groups with a length of 50 mm are symmetrically opened at both ends of the fixed end 1, the groove group comprises a ring groove 4 and four straight grooves 5, the ring groove 4 is 30 mm long and 3 mm deep, the two ends of the straight groove 5 are respectively terminated at the nearest port of the ring groove 4 and the fixed end 1, and the straight groove 5 is 10 mm deep.

[0024] The connecting threaded rod 7 includes a connecting end 6 and an exposed end. The total length of the connecting screw rod 2 is 1070 mm. The connecting end 6 is fixedly connected to the top of the exposed end. The connecting end 6 is 150 mm, the insertion section is 100 mm, and the diameter is 16 mm. The bottom of the connecting end 6 is provided with a thread 7 that cooperates with the thread mouth. The thread 7 section is 50 mm. A centering mark 8 is fixedly connected to the bottom of the exposed end. The centering mark 8 is 50 mm long and 20 mm in diameter. The top 10 mm portion of the centering mark 8 is polished into a hemispherical shape. Two cross-shaped silk lines 9 are engraved at the center of the centering mark 8. The cross-shaped silk lines 9 are 4 mm long, 0.5 mm wide, and 0.5 mm deep.

[0025] The fixed end 1 and the connecting screw 2 are both made of 304 stainless steel.

[0026] The specific implementation process is as follows:

[0027] Several holes are drilled on the wall, and a fixed end 1 is buried in each hole. When measuring a fixed position, the connecting end 6 of the connecting screw 2 is inserted into the connecting hole 3 of the fixed end 1, and the measurement is performed after it is fixed by threaded connection. After the measurement is completed, the connecting screw 2 is removed and continued to be used at the next point to be measured.

[0028] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical scheme or characteristics in the scheme is not described in detail here. For those skilled in the art, without departing from the technical scheme of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A detachable measurement mark, characterized in that: The invention comprises a fixed end (1) and a connecting screw (2), wherein the fixed end (1) is cylindrical, a non-through connecting hole (3) is provided in the middle of the bottom end of the fixed end (1), a thread opening is provided at the bottom end of the side wall of the connecting hole (3), a pair of groove groups are symmetrically provided at both ends of the fixed end (1), the groove group comprises a section of annular groove (4) and four straight grooves (5) arranged perpendicular to the center line, and the two ends of the straight groove (5) are respectively terminated at the annular groove (4) and the fixed end (1). Near the port, the connecting thread (7) rod includes a connecting end (6) and an exposed end, the connecting end (6) is fixedly connected to the top of the exposed end, the connecting end (6) can fully enter the connecting hole (3), the bottom end of the connecting end (6) is provided with a thread (7) that matches the thread mouth, the bottom end of the exposed end is fixedly connected with a centering mark (8), the free end of the centering mark (8) is hemispherical, and two cross-shaped silk lines (9) are engraved at the center position of the centering mark (8).

2. A detachable measurement mark according to claim 1, characterized in that: The fixed end (1) and the connecting screw (2) are both made of 304 stainless steel.

3. A detachable measurement mark according to claim 1, characterized in that: The diameter of the connecting hole (3) is two thirds of the diameter of the fixed end (1).

4. A detachable measurement mark according to claim 1, characterized in that: A single groove group occupies a quarter of the fixed end (1).

5. A detachable measurement mark according to claim 1, characterized in that: The exposed end is 5 to 7 times the length of the connecting end (6).

6. A detachable measurement mark according to claim 1, characterized in that: The diameter of the centering mark (8) is the same as the diameter of the exposed end.

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