Surveying grounding fixture

Abstract

To provide a grounding jig for surveying, which can prevent the tip of a surveying pole from penetrating into soft ground and can improve the accuracy of the height to a surveying mirror by bringing the tip of the surveying pole into direct contact with the ground. [Solution] A surveying grounding jig (100) having a ground contact portion (10) that contacts the ground, an erected portion (20) erected on the ground contact portion (10), and a support portion (30) provided on the erected portion (20), wherein the ground contact portion (10) has an opening (13) below the support portion (30), and the support portion (30) has an insertion opening (34) above the opening (13).

Description

[Technical Field]

[0001] The present invention relates to a grounding jig for surveying. [Background technology]

[0002] In surveying work using a total station, the height from the ground to the mirror (prism) attached to the top of the surveying pole must be accurately determined, so the surveying pole is tapered so that its apex touches the ground. However, while a tapered surveying pole can make contact with hard ground such as paved roads at a single point, the tip of the surveying pole penetrates into soft ground such as unpaved roadbeds, making it difficult to ensure an accurate height.

[0003] Therefore, it has been proposed to attach jigs to the legs of surveying tripods, which are set up on the ground in the same way as surveying poles, to expand the contact area and prevent the tips of the legs from penetrating the ground when the ground is soft (see, for example, Patent Documents 1 and 2). Alternatively, it is common practice to place a metal plate on the soft ground and have the tips of the legs come into contact with the metal plate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 52-018071 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-017238 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the methods using jigs and metal plates described in Patent Documents 1 and 2, because the jig or metal plate is interposed between the leg tip and the ground, manufacturing errors and deformations in the jig or metal plate can cause fluctuations in the height from the ground to the leg tip. Furthermore, because the jig or metal plate contacts the ground over a certain area, unevenness on the ground can cause tilting. Because manufacturing errors, deformations, and tilts occur in the jig or metal plate, it is difficult to ensure accurate height between the ground and the leg tip with conventional technologies. Furthermore, because the jig or metal plate is interposed, it is necessary to make corrections to the height between the leg tip and the leg head.

[0006] Therefore, the present invention has been developed in consideration of the above-mentioned conventional problems, and aims to provide a surveying grounding jig that can prevent the tip of the surveying pole from penetrating into soft ground, while allowing the tip of the surveying pole to come into direct contact with the ground and maintaining a constant height (distance) to the surveying mirror. [Means for solving the problem]

[0007] In order to solve the above problem, the surveying grounding jig of the present invention has a grounding portion that contacts the ground, an upright portion that is erected on the grounding portion, and a support portion that is provided on the upright portion, and is characterized in that the grounding portion has an opening below the support portion, and the support portion has an insertion opening above the opening.

[0008] In this surveying ground jig of the present invention, an opening is provided below the support part, and an insertion opening is provided above the opening, so that the legs of the surveying pole can be inserted into the insertion opening to support it, preventing the tip of the surveying pole from penetrating the soft ground while allowing the tip of the surveying pole to come into direct contact with the ground, improving the accuracy of the height to the surveying mirror. In this case, the height position of the tip of the surveying pole is at the same height as the underside of the surveying ground jig, which means that the height position of the tip of the surveying pole coincides with the height of the ground, improving the accuracy of measuring the height from the ground to the surveying mirror.

[0009] In one aspect of the present invention, the support portion is provided with a fastening hole that penetrates from the outside to the inner wall surface of the insertion opening, and a fastening member that reaches the inner wall surface is arranged in the fastening hole.

[0010] In one aspect of the present invention, the erected portion is provided with a tip visualizing portion that faces the space between the opening and the insertion opening and transmits light.

[0011] In one aspect of the present invention, the grounding portion has a bottom plate portion located below the support portion, and a portion of the bottom plate portion forms an extension portion that extends outward beyond the bottom of the support portion.

[0012] In one aspect of the present invention, the support portion has a main body portion in which the insertion opening and the fastening hole are provided, and the main body portion has a through hole provided at a position that avoids the insertion opening and the fastening hole.

[0013] In one aspect of the present invention, the opening is provided so as to extend outward from below the support portion. [Effects of the Invention]

[0014] The present invention provides a surveying grounding jig that can prevent the tip of the leg from penetrating into soft ground while allowing the tip of the surveying pole to come into direct contact with the ground, thereby improving the accuracy of the height to the surveying mirror. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic perspective view showing an example of the structure of a surveying ground jig 100 according to a first embodiment. [Figure 2] 1 is a schematic side view showing an example of the structure of a surveying ground jig 100. FIG. [Figure 3] 1 is a schematic front view showing an example of the structure of a surveying ground jig 100. FIG. [Figure 4] 1 is a schematic top view showing an example of the structure of a surveying ground jig 100. FIG. [Figure 5]1 is a schematic perspective view showing the entire state in which a surveying ground jig 100 is attached to a surveying pole 200. FIG. [Figure 6] 2 is a schematic perspective view showing an enlarged view of the vicinity of the tip 211 of the survey pole with the survey grounding jig 100 attached to the survey pole 200. FIG. [Figure 7] 1 is a schematic perspective view showing the entire state in which a surveying grounding jig 100 is attached to a surveying pole 300 held by a worker P. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] (First embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, and processes shown in each drawing will be given the same reference numerals, and duplicate explanations will be omitted where appropriate. FIG. 1 is a schematic perspective view showing an example of the structure of a surveying grounding jig 100 according to this embodiment. FIG. 2 is a schematic side view showing an example of the structure of the surveying grounding jig 100. FIG. 3 is a schematic front view showing an example of the structure of the surveying grounding jig 100. FIG. 4 is a schematic top view showing an example of the structure of the surveying grounding jig 100.

[0017] As shown in FIGS. 1 to 4, the surveying grounding jig 100 has a grounding portion 10, an upright portion 20, and a support portion 30. In this embodiment, the grounding portion 10, the upright portion 20, and the support portion 30 are integrally formed from the same material, but each portion may be formed as a separate body and then combined. The material from which the surveying grounding jig 100 is made is not limited, and metal materials, resin materials, inorganic materials, wood, etc. may be used as long as they have sufficient rigidity and strength to support the surveying pole 200. As an example, aluminum may be used from the viewpoints of lightweight, processing precision, and mechanical strength.

[0018] The ground contact portion 10 is a portion whose ground contact surface contacts the ground G and whose upper surface supports each component. An upright portion 20 is provided on the upper surface of the ground contact portion 10. The ground contact portion 10 also includes an extension portion 11, a bottom plate portion 12, and an opening 13. In this embodiment, the ground contact portion 10 is shaped like a flat plate, but it may have a thickness or a curved shape as long as it can contact the ground G over a predetermined area. In this embodiment, the planar shape of the ground contact portion 10 is exemplified by a U-shape or a horseshoe shape in which the periphery of the opening 13 is surrounded by the extension portion 11 and the bottom plate portion 12 and one side of the extension portion 11 is open; however, the specific shape is not limited, and one side of the opening 13 does not have to be open.

[0019] The standing portion 20 stands upright from the ground contact portion 10 and is a portion that connects and holds the ground contact portion 10 and the support portion 30. The standing portion 20 also includes a wall portion 21 and a tip visualizing portion 22. In this embodiment, the standing portion 20 has an example in which a semi-cylindrical shape that is an inverse circle when viewed from above is set up vertically, but the shape and structure are not limited thereto, and a prismatic shape or the like may also be used, and the standing portion 20 may be set up at an angle from the ground contact portion 10. Furthermore, although FIGS. 1 to 4 show an example in which the support portion 30 is provided at the upper end of the standing portion 20, the position at which the standing portion 20 is set up is not limited.

[0020] The support portion 30 is a portion provided on the erection portion 20 to support the surveying pole 200. The support portion 30 also includes a main body portion 31, a through hole 32, a fastening hole 33, an insertion opening 34, and a fastening member 35. In this embodiment, an example of a flat, annular shape is given as the support portion 30, but the shape and structure are not limited as long as it can support the surveying pole 200. As an example, the planar shape may be rectangular or polygonal, or may be uneven or sloped rather than flat.

[0021] The extension portion 11 is a portion configured as part of the ground contact portion 10, and a portion of the bottom plate portion 12 extends outward beyond the lower portion of the support portion 30. In this embodiment, an example of extension portions 11 extending parallel from two locations on the bottom plate portion 12 is shown, but the number and shape of the extension portions 11 are not limited. As an example, the extension portion 11 may extend from the bottom plate portion 12 in a curved shape, or may be configured as a ring-shaped extension portion 11 surrounding the opening 13. As shown in FIGS. 1 and 4 , dividing the extension portion 11 around the opening 13 can ensure a large area for the opening 13. By providing the extension portion 11 extending from the bottom plate portion 12, the stability of the surveying ground contact jig 100 on the ground G can be improved when the surveying pole 200 is inserted into the insertion opening 34.

[0022] The bottom plate portion 12 is configured as part of the ground contact portion 10 and is located below the support portion 30, where the standing portion 20 is provided. In this embodiment, the bottom plate portion 12 has an example of a flat semicircular shape surrounding the opening 13, but the shape of the bottom plate portion 12 is not limited thereto. As an example, the planar shape may be rectangular or polygonal, and may not be flat but may have irregularities or slopes. By positioning the bottom plate portion 12 below the support portion 30, when the surveying pole 200 is inserted into the insertion opening 34, the load applied to the surveying pole 200 is distributed to the bottom plate portion 12 and the extension portion 11, thereby reducing the load per unit area applied to the ground G.

[0023] The opening 13 is an opening surrounded by the bottom plate portion 12 and the extension portion 11, and exposes at least a portion of the ground G below the support portion 30. In this embodiment, the opening 13 is surrounded by the semicircular bottom plate portion 12 and the parallel extension portion 11, and is partially open in the direction opposite the standing portion 20, but the shape is not limited thereto. As an example, the opening 13 may have a shape different from the outer periphery of the bottom plate portion 12, or the outer periphery of the bottom plate portion 12 may be semicircular while the opening 13 may be rectangular. As will be described later, the position where the survey pole tip 211 of the survey pole 200 contacts the ground G is not necessarily located directly below the insertion opening 34 of the support portion 30. Therefore, it is preferable that the opening 13 has a partially open shape and extends outward beyond the lower portion of the support portion 30 so as to increase the area where the survey pole tip 211 of the survey pole 200 contacts the ground G. Furthermore, even when the surveying pole 200 is inserted obliquely through the insertion opening 34, it is preferable that the position of the opening 13 that is open between the extension portions 11 be on the opposite side of the standing portion 20 so that the tip of the leg can come into contact with the ground G.

[0024] By providing the opening 13 in the ground contact part 10, when the surveying pole 200 is inserted into the insertion opening 34, the surveying pole tip 211 can be held in contact with the ground G. This makes it possible to match the height from the surveying pole tip 211 of the surveying pole 200 to the surveying mirror 240 with the height from the ground G to the surveying mirror 240, thereby improving the surveying accuracy of the surveying equipment.

[0025] The wall portion 21 is a wall-like portion erected from the bottom plate portion 12, and a tip visualizing portion 22 is provided on a portion of the wall surface. In this embodiment, an example of a semi-cylindrical shape of the wall portion 21 that follows the inverse circular shape of the bottom plate portion 12 is shown, but the shape is not limited thereto. As an example, the wall portion 21 may be provided in a shape different from the outer peripheral shape of the bottom plate portion 12. Furthermore, although an example in which a single wall portion 21 is provided on the bottom plate portion 12 is shown in FIGS. 1 to 4, the wall portion 21 may be provided by dividing it into a plurality of regions.

[0026] The wall portion 21 must ensure a space for the legs to pass through when the surveying pole 200 is inserted into the insertion opening 34, and it is preferable that the wall portion 21 not be provided in the area connecting the insertion opening 34 and the opening 13. Furthermore, since the wall portion 21 holds the support portion 30 on the bottom plate portion 12, it is preferable that the wall surface be not flat but have a curved shape or a combination of multiple surfaces, thereby reducing weight and improving rigidity.

[0027] The tip viewing portion 22 is a light-transmitting portion provided on the wall portion 21. The tip viewing portion 22 is provided facing the space between the opening 13 and the insertion opening 34. Therefore, the survey pole tip 211 of the survey pole 200 inserted from the insertion opening 34 can be viewed through the tip viewing portion 22 from a position on the opposite side of the wall portion 21 from the opening 13. Although an example in which one large tip viewing portion 22 is provided on the wall portion 21 is shown in FIGS. 1 to 4, multiple small tip viewing portions 22 may be provided separately on the wall portion 21.

[0028] The material constituting the tip visualizing portion 22 is not limited, and the tip visualizing portion 22 may be formed by forming an opening in the wall portion 21, or may be formed by fixing a translucent resin or glass to the opening. Moreover, the entire wall portion 21 may be made of a translucent resin or glass, and the tip visualizing portion 22 may be provided on the entire wall portion 21. Furthermore, the specific shape of the tip visualizing portion 22 is not limited, but it is preferable to provide the tip visualizing portion 22 from near the upper end (support portion 30 side) to near the lower end (ground contact portion 10 side) of the wall portion 21 while maintaining the strength of the wall portion 21.

[0029] The main body 31 constitutes the outer shape of the support part 30 and is provided with a through hole 32, a fastening hole 33, and an insertion opening 34. The main body 31 supports the surveying pole 200 by abutting against the surveying pole 200 when the surveying pole 200 is inserted into the insertion opening 34. Furthermore, as described below, the tips of fastening members 35 protrude from the inner wall surface of the main body 31 to fasten the surveying pole 200, thereby restricting movement of the surveying pole 200. In this embodiment, an example of a flat circular ring shape is shown for the main body 31, but the shape is not limited thereto. The planar shape may be rectangular or polygonal, or may be uneven or inclined rather than flat. Furthermore, while an example has been shown in which the main body 31 is provided around the entire circumference of the insertion opening 34, a slit may be provided in part of the main body 31. Furthermore, the main body 31 may be divided into multiple parts.

[0030] The through holes 32 are a plurality of holes provided in the main body 31. The positions of the through holes 32 are not limited, but are preferably positions that avoid the insertion openings 34 and the fastening holes 33. In the present embodiment, an example is shown in which circular holes penetrate from the upper surface to the lower surface of the main body 31, but the shape of the holes is not limited and may be rectangular or linear. Furthermore, the through holes 32 may be formed by holes that penetrate from the outer wall surface to the inner wall surface of the main body 31. Providing the through holes 32 allows the main body 31 to be lightweight while maintaining its mechanical strength. In the present embodiment, an example is shown in which the through holes 32 are provided in the main body 31, but the through holes 32 may not be provided in order to ensure the mechanical strength of the main body 31.

[0031] The fastening holes 33 are holes provided in the main body 31, and are portions into which fastening members 35 are inserted. In this embodiment, an example is shown in which screw holes are provided in two locations on the main body 31, penetrating horizontally from the outer wall surface to the inner wall surface, but the number and orientation of the fastening holes 33 are not limited. The locations of the fastening holes 33 are not limited, but it is preferable to provide them in positions offset to one side of the insertion opening 34 so that the fastening members 35 press the surveying pole 200 against the inner wall surface of the main body 31 (the inner wall surface of the insertion opening 34). In this embodiment, two fastening holes 33 are provided above the bottom plate 12 and the wall 21, and the surveying pole 200 is pressed in the direction in which the opening 13 is released (the extension direction of the extension portion 11). By providing the fastening holes 33 in two or more locations offset to one side of the insertion opening 34, the surveying pole 200 can be stably supported at three points: the tips of the fastening members 35 and the inner wall surface of the main body 31.

[0032] The insertion opening 34 is an opening provided in the main body 31, and is a portion into which the surveying pole 200 is inserted. In this embodiment, the insertion opening 34 is provided above the opening 13, and when the surveying pole 200 is inserted vertically through the insertion opening 34, the tip 211 of the surveying pole comes into contact with the ground G exposed through the opening 13. The position of the insertion opening 34 is not limited to directly above the opening 13. If the wall 21 is provided at an angle from the bottom plate 12, the surveying pole 200 may be inserted obliquely from the insertion opening 34 to the opening 13. The shape of the insertion opening 34 is not limited, but it needs to have a shape and size that allows the surveying pole 200 to be inserted therein, and it is preferable that the shape be similar to the cross section of the surveying pole 200.

[0033] The fastening member 35 is a member that is placed in the fastening hole 33 and whose tip reaches the inner wall surface of the main body 31. If the fastening hole 33 is a threaded hole, a screw or a bolt can be used as the fastening member 35. In the surveying grounding jig 100 of this embodiment, the surveying pole 200 is inserted into the insertion opening 34, and the fastening member 35 is inserted into the fastening hole 33 and fastened, so that the tip of the fastening member 35 can press and fix the surveying pole 200 against the inner wall surface of the main body 31.

[0034] FIG. 5 is a schematic perspective view showing the entire state in which the survey grounding jig 100 is attached to the survey pole 200. FIG. 6 is a schematic perspective view showing an enlarged view of the vicinity of the survey pole tip 211 in the state in which the survey grounding jig 100 is attached to the survey pole 200. The survey pole 200 is a device for conducting surveys using surveying equipment. As shown in FIG. 5, the survey pole 200 has a survey pole tip 211, a survey pole head 220, a mounting portion 230, and a mirror 240. The survey pole 200 is supported by two support portions 210 and is installed vertically to the ground G. The support portions 210 are provided with a cover plate 212 and a support tip 215. A level 213 is also provided to the survey pole head 220.

[0035] The survey pole tip 211 is provided at the lower end of the survey pole 200 and is the part that comes into contact with the ground G. In this embodiment, the shape of the survey pole tip 211 is shown as a conical spire shape that tapers downward, but the shape is not limited to this. The material that makes up the survey pole tip 211 is not limited, but it is preferable to use a metal material whose tip that comes into contact with the ground is resistant to wear even if the ground G is hard. Furthermore, the survey pole tip 211 may be configured separately from the survey pole 200, and the survey pole tip 211 may be attached to the survey pole 200 in an exchangeable manner.

[0036] The support sections 210 are rod-shaped members extending diagonally downward from the surveying pole head section 220, and form two hypotenuses with the surveying pole head section 220 as the apex. Support tips 215 are provided at the lower ends of the two support sections 210, and cover plates 212 are provided on the tops of the support tips 215. The material from which the support sections 210 are made is not limited, and metal materials or carbon may be used. The support sections 210 are provided with an extension mechanism (not shown), and by adjusting the length of the support sections 210, the surveying pole 200 can be set vertically relative to the horizontal direction.

[0037] The cover plate 212 is a flat plate-like portion provided at the boundary between the support column 210 and the support column tip 215. In this embodiment, the cover plate 212 is shown to be circular, but the shape is not limited thereto. The cover plate 212 may be formed separately from the support column 210 and the support column tip 215 and attached thereto, or may be formed integrally with the support column 210 or the support column tip 215.

[0038] The level 213 is a part that is provided on the surveying pole head 220 and that checks the levelness of the surveying pole 200, the surveying pole head 220, and the mounting part 230. The specific configuration of the level 213 is not limited, and a conventionally known bubble level, digital level, laser level, etc. can be used.

[0039] The surveying pole head 220 is located at the vertex of a triangle formed by the two support sections 210, and is the section on which a mirror 240 and the like are mounted. A mounting section 230 is provided on the top of the surveying pole head 220. In this embodiment, an example of a disk-shaped surveying pole head 220 is shown, but the shape and structure are not limited thereto.

[0040] The mounting part 230 is a part provided on the surveying pole head 220 for fixing the mirror 240 to the surveying pole head 220. In Fig. 5, the mounting part 230 is shown as having a shape that protrudes upward from the surveying pole head 220, but a recess provided in the surveying pole head 220 may also serve as the mounting part 230. Furthermore, the mounting part 230 may have a shape and structure corresponding to the fixing structure provided on the mirror 240 side.

[0041] The mirror 240 is attached to the mounting part 230 and reflects light from the surveying instrument. The shape and structure of the mirror 240 are not limited, and a flat mirror surface, a curved mirror surface, a structure that reflects light using a prism, etc. may be used. The mirror 240 may also have a structure that allows it to be moved up and down the mounting part 230 and fixed at a predetermined height.

[0042] When the surveying pole 200 is placed on soft ground G to perform a survey, the surveying pole tip 211, without the cover plate 212, is inserted into the insertion opening 34 of the main body 31. At this time, the fastening member 35 is inserted into the fastening hole 33 when the apex of the surveying pole tip 211 reaches a position where it contacts the ground G exposed through the opening 13. When the tip of the fastening member 35 protrudes from the inner wall surface of the insertion opening 34, it abuts against the support part 210 or the surveying pole tip 211, urging the support part 210 and the surveying pole tip 211 in the opposite direction from the fastening hole 33. As a result, part of the side surface of the support part 210 or the surveying pole tip 211 is sandwiched between the inner wall surface of the insertion opening 34 and the tip of the fastening member 35, restricting the movement of the support part 210 and the surveying pole tip 211 in the up, down, left, and right directions.

[0043] When surveying using the surveying pole 200, first the mirror 240 is attached to the mounting part 230, and the length of the support part 210 is adjusted while checking the level 213, so that the surveying pole 200 is aligned vertically. In addition, the distance from the surveying pole tip 211 of the surveying pole 200 to the center of the mirror 240 is measured in advance as the installation height. Next, a surveying instrument is installed near the surveying pole 200, the height of the mirror 240 is measured, and the road surface height is calculated from the measured height and the installation height.

[0044] As shown in FIG. 6 , when the surveying grounding jig 100 is attached to the surveying pole 200, the apex of the surveying pole tip 211 abuts the surface of the ground G, and the back surfaces of the base plate 12 and extension 11 also abut the surface of the ground G. As described above, the surveying pole 200 is sandwiched between the fastening member 35 and the inner wall surface of the main body 31, and the surveying pole 200 is supported by the surveying grounding jig 100 while its movement in the vertical direction is restricted. As a result, the load of the surveying pole 200 is distributed not only to the apex of the surveying pole tip 211 but also to the back surfaces of the base plate 12 and extension 11, and is supported over a predetermined area. Therefore, the surveying pole tip 211 does not intrude into the ground G, and the height from the apex of the surveying pole tip 211 to the surveying mirror 240 can be accurately maintained even on soft ground G. Furthermore, even if the ground G is somewhat uneven, by abutting the apex of the surveying pole tip 211 against the ground G with the back surfaces of the bottom plate 12 and extension 11 abutting against the surface of the ground G, the height from the apex of the surveying pole tip 211 to the surveying mirror 240 can be accurately maintained even on uneven ground G. Furthermore, by distributing the pressure applied to the surveying pole tip 211 to the bottom plate 12 and extension 11, wear on the apex of the surveying pole tip 211 can be reduced.

[0045] As described above, in the surveying grounding jig 100 of this embodiment, an opening 13 is provided below the support portion 30, and an insertion opening 34 is provided above the opening 13, so that the surveying pole 200 can be inserted into the insertion opening 34 and supported, preventing the surveying pole tip 211 from penetrating into the soft ground G, while bringing the surveying pole tip 211 into direct contact with the ground G, thereby improving the accuracy of the height to the surveying mirror 240.

[0046] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 7. Descriptions of content that overlap with the first embodiment will be omitted. FIG. 7 is a schematic perspective view showing the entire state in which a survey grounding jig 100 is attached to a survey pole 300 held by a worker P. As shown in FIG. 7, the survey pole 300 held by the worker P has a support part 310, a pole tip 311, a mirror 312, and a spirit level 313.

[0047] The support part 310 is a rod-shaped part with a pole tip 311 provided at its lower end and to which a mirror 312 and a level 313 are attached. The support part 310 may be color-coded or have a scale corresponding to the height from the pole tip 311. When the worker P holds the pole 310 while checking the level, the surveying pole 300 is held upright in the vertical direction relative to the ground G.

[0048] Pole tip 311 is provided at the lower end of support part 310 and is the part that comes into contact with the ground G. In this embodiment, pole tip 311 has a conical spire shape that tapers downward, but the shape is not limited to this. The material that makes up pole tip 311 is not limited, but it is preferable to use a metal material whose tip that comes into contact with the ground G is resistant to wear even if the ground G is hard. Furthermore, pole tip 311 may be formed separately from support part 310, and pole tip 311 may be attached to support part 310 in a replaceable manner.

[0049] Mirror 312 is attached to support 310 and reflects light from the surveying instrument. There are no limitations on the shape or structure of mirror 312, and it is possible to use a flat mirror surface, a curved mirror surface, or a structure that reflects light using a prism. Furthermore, mirror 312 preferably has a structure that allows it to be moved up and down on support 310 and fixed at a predetermined height.

[0050] The level 313 is a part provided on the support part 310 to check the verticality of the pole 300. The specific configuration of the level is not limited, and a conventionally known bubble level, digital level, laser level, etc. can be used.

[0051] As shown in Figure 7, when a survey is performed by placing a survey pole 300 held by an operator P on soft ground G, the pole tip 311 is inserted into the insertion opening 34 of the survey grounding jig 100. The tilt of the survey pole 300 with respect to the ground G is adjusted while checking the level 313, so that the support part 310 is vertical. The distance from the pole tip 311 to the center of the mirror 312 is measured in advance as the installation height. Next, a surveying instrument is installed near the measurement location, the height of the mirror 312 is measured, and the road surface height is calculated from the measured height and the installation height.

[0052] In the surveying grounding jig 100 of this embodiment, an opening 13 is provided below the support portion 30, and an insertion opening 34 is provided above the opening 13, so that the pole tip 311 of the surveying pole 300 can be inserted into the insertion opening 34 and supported, preventing the pole tip 311 from penetrating the soft ground G while allowing the pole tip 311 to come into direct contact with the ground G, thereby improving the accuracy of the height to the mirror 312.

[0053] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0054] 100...Survey grounding jig 10…Grounding part 11...Extension part 12…Bottom plate part 13...Opening 20...Upright section 21...Wall part 22...Tip visibility part 30...Support part 31...Main body 32...Through hole 33…Fastening hole 34...insertion opening 35...Fastening member 200, 300...Survey pole 210,310…Strut part 211...Survey pole tip 212...Cover plate 213…Level 215...Tip of pillar 220...Survey pole head 230...Mounting part 240,312...Mirror 311...Pole tip 313…Level

Claims

1. A device having a ground contacting part that contacts the ground, an upright part that stands on the ground contacting part, and a support part that is provided on the upright part, an opening is provided in the ground portion below the support portion, an insertion opening is provided in the support portion above the opening; The support portion is provided with a fastening hole that penetrates from the outside to the inner wall surface of the insertion opening, A surveying grounding jig, characterized in that a fastening member that reaches the inner wall surface is placed in the fastening hole.

2. The surveying grounding jig according to claim 1, the support portion has a main body portion in which the insertion opening and the fastening hole are provided, A grounding jig for surveying, characterized in that the main body portion has a through hole at a position that avoids the insertion opening and the fastening hole.

3. A device having a grounding portion that contacts the ground, an erecting portion that is erected on the grounding portion, and a support portion that is provided on the erecting portion, an opening is provided in the ground portion below the support portion, an insertion opening is provided in the support portion above the opening; the grounding portion has a bottom plate portion located below the support portion, A surveying grounding jig characterized in that a portion of the bottom plate portion forms an extension portion that extends outward beyond the lower portion of the support portion.

4. A device having a grounding portion that contacts the ground, an erecting portion that is erected on the grounding portion, and a support portion that is provided on the erecting portion, an opening is provided in the ground portion below the support portion, an insertion opening is provided in the support portion above the opening; A surveying grounding jig characterized in that the opening is extended outward beyond the lower part of the support portion.

5. A surveying grounding jig according to any one of claims 1 to 4, A surveying grounding jig, characterized in that the standing portion is provided with a tip viewing portion that faces the space between the opening and the insertion opening and transmits light.

Images