Level adjustment mechanism, level adjustment method, pipe support stand

Abstract

To provide a level adjustment mechanism that can easily install a predetermined object including a pipe at a desired height or inclination in a place with a predetermined difference in elevation or unevenness, and that has load resistance, safety, and durability for the predetermined object. [Solution] The level adjustment mechanism is for a pipe support base S suitable for pipes P to be installed on the top surface of a concrete equipment foundation G installed on the roof of a concrete building in an apartment complex, and comprises a bolt 1 having a square cross-section rectangular column portion 12 formed at its base and a nut 2 fastened to the bolt 1, a first plate material 3 having a level adjustment hole 31 into which the rectangular column portion 12 fits while passing the bolt 1, and a second plate material 41 having an insertion hole through which the bolt 1 passes, and the level adjustment hole 31 has multiple notches 311 at a predetermined pitch in the height direction into which a pair of opposing corners of the rectangular column portion 12 fit.

Description

[Technical Field]

[0001] The present invention relates to a level adjustment mechanism for pipes installed in, for example, apartment buildings, a level adjustment method using the level adjustment mechanism, and a pipe support base that employs the level adjustment mechanism. [Background technology]

[0002] Conventionally, when laying long pipes such as water supply pipes, chimney pipes, and connecting water supply pipes on the concrete roof of an apartment building, a spacer has been sandwiched between the pipes and the ground to compensate for any predetermined height differences or unevenness in the ground above the roof. The spacer is a support base as disclosed in Patent Documents 1 and 2, for example, but because the support base is not adjustable, additional height adjustment requires another spacer, making it difficult to improve labor efficiency. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-065838 [Patent Document 2] Japanese Patent Application Publication No. 10-061831 Summary of the Invention [Problem to be solved by the invention]

[0004] It is not easy to grasp all of the above-mentioned differences in elevation and unevenness before laying the pipes, and then set the height of the support base or prepare the separate spacers based on this information. Furthermore, the pipes may require a slope depending on the installation location, so a mechanism that can adjust the height (level) of the support base should be adopted. After much ingenuity, the inventors came up with the idea of ​​the above-mentioned mechanism, which allows for easy level adjustment, facilitates labor efficiency, and also contributes to saving on construction costs.

[0005] Furthermore, the above mechanism should have load-bearing capacity and safety, taking into account the total weight, including the fluid, in the piping. The above load-bearing capacity and safety means that problems such as breakage, dislocation, loosening, and slippage of the mechanism due to the load of the piping can be prevented and avoided. Furthermore, it is desirable that the above mechanism also has durability, taking into account adverse environments that are susceptible to the effects of weather, such as on a rooftop. This is because the above load-bearing capacity, safety, and durability lead to a reduction in the burden of managing the piping.

[0006] Therefore, the object of the present invention is to provide a level adjustment mechanism that makes it easy to install specified objects, including piping, at a desired height and inclination in places with specified elevation differences and unevenness, and that has load-bearing capacity, safety, and durability for the specified objects, thereby reducing the burden of managing the specified objects, a level adjustment method using the level adjustment mechanism, and a piping support stand that employs the level adjustment mechanism. [Means for solving the problem]

[0007] That is, the level adjustment mechanism of the present invention comprises a bolt having a prismatic section with a cross section of at least a square formed at its base, a nut fastened to the bolt, a first plate having a level adjustment hole through which the bolt passes and into which the prismatic section fits, and a second plate having an insertion hole through which the bolt passes, wherein the level adjustment hole has a plurality of notches at a predetermined pitch in the height direction into which a pair of opposing corners of the prismatic section or a pair of corners located at both ends of each of a pair of opposing face sections fits. The insertion holes may be fitting holes into which the prismatic section fits.

[0008] The level adjustment mechanism of the present invention includes a bolt having a prismatic section with a triangular cross section formed at its base, a nut fastened to the bolt, a first plate having a level adjustment hole through which the bolt passes and into which the prismatic section fits, and a second plate having an insertion hole through which the bolt passes, the level adjustment hole having a plurality of notches at a predetermined pitch in the height direction into which a pair of adjacent corners of the prismatic section fit. The insertion holes may be fitting holes into which the prismatic section fits.

[0009] With this configuration, the rectangular column portion at the base of the bolt is fitted into the fitting hole, and then the nut and bolt are fastened to the desired position in the level adjustment hole, which is expected to have the effect of efficiently adjusting the level. Furthermore, because the corner of the rectangular column portion fits into the notch, it is expected that the corner of the rectangular column portion will be less likely to slip in the notch, and it will be easier to ensure an engagement allowance for the corner of the rectangular column portion that is long enough to withstand a load from above on the notch, compared to, for example, a mechanism in which the arc portion of a cylindrical portion with a circular cross section fits instead of a rectangular column portion.

[0010] Furthermore, it is desirable that the pitch of the notches into which the pair of opposing corners fit is 3 to 10 mm. With this configuration, the level adjustment range is neither too narrow nor too wide, which is expected to make it easy to adjust to a desired level.

[0011] Furthermore, the level adjustment method using the level adjustment mechanism of the present invention includes the steps of overlapping the first plate material and the second plate material, inserting the bolt toward the first plate material, fitting the rectangular column portion into the level adjustment hole and then the fitting hole, and tightening the nut onto the bolt toward the second plate material.

[0012] These processes allow the bolt to be inserted while visually checking the height position relative to the level adjustment hole, making it easy to adjust to the desired level. Furthermore, when readjusting, the screw part can be slid up and down relative to the level adjustment hole by loosening the nut and pulling the rectangular column part out of the level adjustment hole, and horizontal misalignment is also unlikely to occur, making it easy to readjust to the desired level.

[0013] In addition, in the piping support base equipped with the level adjustment mechanism of the present invention, the first plate material and the second plate material are L-shaped steel plates, the first plate material has a first vertical plate portion having the level adjustment hole formed therein and a first horizontal plate portion continuous with and perpendicular to the lower end of the first vertical plate portion, the second plate material has a second vertical plate portion having the fitting hole formed therein and a second horizontal plate portion continuous with and perpendicular to the upper end of the second vertical plate portion, and the first horizontal plate portion has a through hole formed in a longitudinal direction and a horizontally elongated shape. With this configuration, a piping support base that exhibits the functional effects of the above-mentioned level adjustment mechanism can be obtained, and the effect of making it easier to lay piping can be expected. [Effects of the Invention]

[0014] According to the present invention, it is easy to install specified objects, including piping, at a desired height and inclination in places with a specified difference in elevation or unevenness, and by providing load-bearing capacity, safety, and durability for the specified objects, it is expected that the burden of managing the specified objects will be reduced. [Brief explanation of the drawings]

[0015] [Figure 1] 1A and 1B are a front view and a side view showing a state in which a pipe support base employing a level adjustment mechanism according to one embodiment of the present invention is used. [Figure 2] FIG. 2 is an exploded view of each component constituting the pipe support base. [Figure 3] 4A and 4B are explanatory diagrams of level adjustment by the level adjustment mechanism. [Figure 4] 10A and 10B are diagrams illustrating another level adjustment mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0016] A level adjustment mechanism according to one embodiment of the present invention (hereinafter also referred to as "this level adjustment mechanism") will be described below with reference to Figures 1 to 3. In these figures, when there are multiple identical parts, only one part is numbered. For the sake of convenience, certain parts and their leading lines are sometimes shown as hidden lines (broken lines) or imaginary lines (two-dot chain lines). In the description, terms indicating directions such as up, down, side, vertical direction, horizontal direction, etc. are basically based on the horizontal ground, and when other references are used, they will be explained appropriately.

[0017] <Outline of this level adjustment mechanism> As shown in Figure 1, this level adjustment mechanism is for a pipe support base S suitable for piping P to be installed on the top surface of a concrete equipment foundation G installed on the roof of a concrete building in an apartment building, and comprises a bolt 1 having a square cross-section rectangular column portion 12 formed at its base and a nut 2 fastened to the bolt 1, a first plate material 3 having a level adjustment hole 31 into which the rectangular column portion 12 fits, and a second plate material 41 having a fitting hole 41 into which the rectangular column portion 12 fits, and the level adjustment hole 31 has multiple notches 311 in the vertical direction at a predetermined pitch into which a pair of opposing corners of the rectangular column portion 12 fit.

[0018] The apartment complex in which this level adjustment mechanism is adopted is not limited by site area or number of floors, the number, size, or layout of rooms, or by structure (such as reinforced concrete (RC), steel-framed reinforced concrete (SRC), steel-framed (S), or wood), and is not limited by specifications or construction methods, including structural parts such as columns, beams, walls, floors, and ceilings, or non-structural parts such as fixtures, wiring, piping, and equipment.This level adjustment mechanism may be adopted as a support platform suitable for pipes and other building fixtures installed on ground or foundations with a specified height difference or unevenness, or as a tool for construction that requires height adjustment, and may also be adopted in various buildings other than apartment complexes, such as schools, hospitals, facilities for the elderly, facilities for the disabled, and various commercial facilities.

[0019] <Outline of Bolt 1 and Nut 2> As shown in Figure 2, bolt 1 has a head 11, a rectangular column portion 12 formed at the base adjacent to head 11, and a male-threaded threaded portion 13 adjacent to rectangular column portion 12, and may be called a square-head bolt. Head 11 is of a type that is fastened to nut 2 via a recess or hexagonal hole formed at the top, but it may also be of a type that does not have these and is fastened to nut 2 with a spanner or wrench. Nut 2 is female-threaded and can be attached and detached to threaded portion 13.

[0020] <Details of the rectangular column part 12> Prismatic portion 12 is formed integrally with bolt 1, but may also be a separate member that is fastened to threaded portion 13, for example. Prismatic portion 12 has a square cross section with sides of approximately 10 mm, but the sides may be longer or shorter than 10 mm, and may also be rectangular or diamond-shaped with a small aspect ratio of, for example, approximately 10:9. The side surfaces of prismatic portion 12 are flat, but may also be arc-shaped or curved.

[0021] The thickness W12a of the prismatic portion 12 is equal to or thinner than the sum of the thicknesses of the first plate member 3 and the second plate member 4, and is thicker than the thickness of the first member 3. In other words, it is preferable that the prismatic portion 12 is provided across the first plate member 3 and the second plate member 4. Therefore, unlike the configuration in Figure 1, if the second member 4 is arranged closer to the head 11 (see Figure 2) of the bolt 1 than the first member 3, the thickness W12a of the rectangular column portion 12 only needs to be thicker than the thickness of the second member 4. For example, the thickness W12a of the rectangular column portion 12 may be 3 to 7 mm, preferably 4 to 6 mm, and more preferably 4.5 to 5.5 mm. If it is thicker than 3 mm, the fitting force will be suitable along with the appropriate amount of fitting to the second plate material 4, and if it is thinner than 7 mm, it will not exceed the sum of the thicknesses of the first plate material 3 and the second plate material 4, and the first plate material 3 and the second plate material 4 can be fastened together with the nut 2.

[0022] The diagonal length W12b of the prismatic portion 12 is not limited as long as it can be freely inserted into the level adjustment hole 31 and the fitting hole 41, and is shorter than the width (diameter) of the head 11 and longer than the width (diameter) of the screw portion 13, or is approximately equal to the width of the screw portion 13 so that the circular cross section of the screw portion 13 is inscribed in the square cross section of the prismatic portion 12. The present invention is not limited to the above configuration. For example, the rectangular column portion 12 only needs to be configured to fit into at least the notch portion 311 of the level adjustment hole 31, and it is preferable, but not essential, for it to have the function of fitting into the fitting hole 41. In this way, if the rectangular column portion 12 is configured not to fit into the fitting hole 41, the thickness W12a of the rectangular column portion 12 may be thinner than the thickness W3 of the first plate material 3. In other words, the prismatic portion 12 does not have to be provided across the first plate member 3 and the second plate member 4.

[0023] <Outline of First Plate 3> As shown in Fig. 2, the first plate member 3 is an L-shaped steel plate and has a horizontally elongated first vertical plate portion 32 with a level adjustment hole 31 formed therein, and a first horizontal plate portion 33 extending continuously from the lower end of the first vertical plate portion 32. The first horizontal plate portion 33 has through holes 33a for inserting anchor bolts Q (see Fig. 1) that secure the first plate member 3 to the ground G. The length, width, and depth dimensions of the first plate member 3 are not particularly limited and may be, for example, 120 mm x 240 mm x 50 mm.

[0024] 2, the thickness W3 of the first plate 3 is not particularly limited, but may be 2 to 5 mm, preferably 2.5 to 4 mm, and more preferably 3 to 3.5 mm. A thickness of more than 2 mm will ensure the desired strength, while a thickness of less than 5 mm will facilitate construction without being too heavy. The first vertical plate portion 32 has one level adjustment hole 31 near each of the left and right ends, but may have two or more. For example, there may be only one or two or more near the center, as long as the desired state, such as the angle and stability of the second plate 4 fixed to the first plate 3, can be maintained.

[0025] <Details of level adjustment hole 31> As shown in Figures 2 and 3, the upper or lower end of the level adjustment hole 31 is notched to fit into the upper or lower corner of the rectangular column portion 12 and a pair of opposing corners on both the left and right sides, and the middle portion excluding the upper and lower ends is notched to fit into a pair of opposing corners on both the left and right sides of the rectangular column portion 12.In other words, the level adjustment hole 31 has a plurality of right-angled notches 311 that fit into the above-mentioned pair of corners in the vertical direction at a predetermined pitch, and trapezoidal notched recesses 312 located between the upper and lower notches 311.

[0026] The width W31 of the level adjustment hole 31 is the distance between the vertices of the opposing cutout portions 311 on both the left and right sides, and may be slightly longer than the diagonal length W12b of the rectangular column portion 12 so that the rectangular column portion 12 can be inserted freely. The length from the top to the bottom of the level adjustment hole 31 may be shorter than the vertical dimension of the first plate material 3, and may be, for example, about 100 mm. In the level adjustment hole 31 , the minimum horizontal width between the plurality of notches 311 adjacent in the height direction is larger than the diameter of the threaded portion 13 of the bolt 1 . With this configuration, the bolt 1 can be moved up and down relative to the first plate material 3 with the threaded portion 13 of the bolt 1 inserted into the level adjustment hole 31 .

[0027] The distance W311 between the outermost end of the notched portion 311 and the innermost end of the notched recess 312 is the overlap allowance for the corner of the rectangular column portion 12, and the ratio of the distance W311 to the width W31 of the level adjustment hole 31 is 1:6 to 1:2, preferably 1:5 to 1:3, and more preferably 1:4.5 to 1:3.5. A difference smaller than 1:6 ensures the above overlap allowance and can withstand a load from above. Furthermore, a difference larger than 1:2 prevents the notched recess 312 from becoming pointed in a triangular shape, preventing stress concentration due to a load from above and avoiding breakage.

[0028] The pitch H311 between the upper and lower notches 311 may be 3 to 10 mm, preferably 4 to 8 mm, and more preferably 5 to 7 mm. If it is longer than 3 mm, the pitch is not too fine and the level can be easily adjusted, and if it is shorter than 10 mm, the pitch is not too rough and the desired level can be easily adjusted.

[0029] The length H312 of the innermost end of the notched recess 312 is not particularly limited, but if it is not too long, the above-mentioned overlapping distance W311 becomes appropriate, and if it is not too short, it avoids becoming pointed in a triangular shape and becomes less susceptible to stress concentration due to load from above.

[0030] <Outline of Second Plate 4> As shown in Fig. 2, the second plate member 4 is an L-shaped steel plate, and has a horizontally elongated second vertical plate member 42 having a fitting hole 41 formed therein, and a second horizontal plate member 43 extending continuously from the upper end of the second vertical plate member 42. The second horizontal plate member 43 has a horizontally elongated through-hole 43a for fastening a U-bolt U (see Fig. 1) that fastens the piping P. The length, width, and depth of the second plate member 4 are not particularly limited and may be the same as those of the first plate member 3, or the depth may be 35 mm, for example.

[0031] 2, the thickness W4 of the second plate member 4 is not particularly limited, but may be equal to the thickness W3 of the first plate member 3. The second vertical plate portion 42 only needs to have the fitting hole 41 at a position facing the level adjustment hole 31 of the first vertical plate portion 32.

[0032] <Details of fitting hole 41> As shown in Figures 2 and 3, the fitting hole 41 has a shape that matches the upper and lower ends of the level adjustment hole 31 and the cutout portion 311, and the width W41 of the fitting hole 41 is equal to the width W31 of the level adjustment hole 31. In this embodiment, only two fitting holes 41 are provided at the same height in the second vertical plate portion 42 of the second member 4, but this configuration is not limited to this and multiple fitting holes 41 may be provided in the vertical direction. Furthermore, the fitting hole 41 formed in the second plate 4 has a square cross section, which is preferable because it fits into the rectangular column portion 12 and makes it easy to stabilize the position of the second plate 4. However, the present invention is not limited to such a configuration, and when the thickness W12a of the rectangular column portion 12 is equal to or thinner than the thickness W3 of the first plate material 3, the rectangular column portion 12 does not reach the second plate material 4 when fastened, and therefore the hole formed in the second plate material 4 may be formed, for example, in a circular hole shape and simply serve as a hole (insertion hole) through which the bolt 1 is inserted.

[0033] <Level adjustment method using this level adjustment mechanism> 1 and 2, the first plate member 3 may or may not be fixed to the ground G. However, by first overlapping the first vertical plate member 32 and the second vertical plate member 42 with the first horizontal plate member 33 and the second horizontal plate member 43 as references, so that the first vertical plate member 32 is positioned on the outside and the second vertical plate member 42 is positioned on the inside, the level adjustment hole 31 is also positioned on the outside and visible, making it easy to adjust the level without interference from the first horizontal plate member 33 and the second horizontal plate member 43. Next, the bolt 1 is inserted from the outside toward the first vertical plate member 32, and the threaded portion 13 is passed through the level adjustment hole 31 and the fitting hole 41. Then, the rectangular column portion 12 is fitted into the level adjustment hole 31 and the fitting hole 41 in this order. The desired level can be roughly set by loosely tightening the nut 2 with one's fingers without using any tools. Finally, when tightening the nut 2 onto the threaded portion 13 toward the second vertical plate portion 42, since the rectangular column portion 12 is fitted into the level adjustment hole 31 and the fitting hole 41, there is no need to hold the head 11 of the bolt 1 with a wrench or the like to prevent it from spinning freely.

[0034] When readjusting the level, by pulling the bolt 1 outward and loosening the nut 2 to a position where the rectangular column portion 12 can be released from its engagement with the level adjustment hole 31, not only can the threaded portion 13, which is thinner than the minimum width of the level adjustment hole 31 and the width W41 of the engagement hole 41, slide up and down without removing the nut 2, but also, since the difference between the minimum width of the level adjustment hole 31 and the width W41 of the engagement hole 41 and the diameter of the threaded portion 13 is small, horizontal misalignment is unlikely to occur.

[0035] <Effects of the level adjustment mechanism and the level adjustment method using the same> 1 to 3, according to this level adjustment mechanism, since the second plate 4 slides perpendicularly to the ground G to which the first plate 3 is fixed, as long as the desired pitch is met, it is possible to expect more efficient level adjustment effects than when the slide is oblique. Also, since the corners of the rectangular column portion 12 fit into the cutouts 311, it is expected that the corners of the rectangular column portion 12 will not easily slip in the cutouts 311, and it will be easier to ensure an engagement allowance for the corners of the rectangular column portion 12 that is long enough to withstand a load from above on the cutouts 311, as compared to a mechanism in which, for example, the arc portion of a columnar portion with a circular cross section fits in place of the rectangular column portion 12.

[0036] Furthermore, according to the above level adjustment method, the bolt 1 can be inserted while visually checking the height position relative to the level adjustment hole 31, making it easy to adjust to the desired level. Furthermore, when readjusting, the nut 2 can be loosened and the rectangular column portion 12 can be pulled out from the level adjustment hole 31 and the fitting hole 41, allowing the screw portion 13 to slide up and down relative to the level adjustment hole 31, and horizontal positional deviation is unlikely to occur, so it is expected that the level can be easily readjusted to the desired level. It is preferable to insert the bolt 1 into the level adjustment hole 31 of the first plate material 3, determine the height of the bolt 1 and the second plate material 4, and then fit the square column portion 12 into the level adjustment hole 31 and the fitting hole 41 in that order, because this allows the position of the second plate material 4 to be determined without moving the bolt 1 and the second plate material 4 simultaneously. However, the present invention is not limited to such a configuration, and the bolt 1 may be inserted into the fitting hole 41 of the second plate material 4, the height of the bolt 1 and the second plate material 4 may be determined, and then the rectangular column portion 12 may be fitted into the fitting hole 41 and the level adjustment hole 31 in that order.

[0037] Next, with reference to Fig. 4, another level adjustment mechanism according to one embodiment of the present invention will be described, focusing on the differences from the above-described level adjustment mechanism, and a description of equivalent parts will be omitted. For ease of reference, parts or portions equivalent to those shown in Fig. 2 and Fig. 3 are numbered by adding 100 to 300 and 1000 to 3000 to those in Fig. 2 and Fig. 3.

[0038] As shown in FIG. 4( a), the prismatic portion 112 has a regular pentagonal cross section, and the level adjustment hole 131 has a plurality of notches 1311 arranged vertically at a predetermined pitch. The notches 1311 fit into pairs of opposing corners of the prismatic portion 112, each of which is located on the same horizontal line. The upper end of the level adjustment hole 131 is notched to fit into all four corners of the prismatic portion 112, excluding one lower corner. The lower end (not shown) is notched to fit into all three corners of the prismatic portion 112, excluding the two upper corners. The level adjustment hole 131 has a triangular notched recess 1312 with two sides of different lengths between the upper and lower notched portions 1311. The innermost end of the notched recess 1312 is pointed, allowing the overlap of the prismatic portion 112 to be adjusted to the desired length.

[0039] As shown in FIG. 4(b), the rectangular column portion 212 has a regular hexagonal cross section, and the level adjustment hole 231 has a plurality of notches 2311 in the vertical direction at a predetermined pitch, into which corners located at both the upper and lower ends of each of a pair of laterally opposing face portions of the rectangular column portion 212 fit. The upper end of the level adjustment hole 231 is notched to fit five corners of the rectangular column portion 212 excluding one corner located on the lower side, and the lower end (not shown) is notched to fit five corners of the rectangular column portion 212 excluding one corner located on the upper side. The pitch H2311 between the upper and lower notches 2311 is the distance between the midpoints of the face portions in the vertical direction.

[0040] As shown in FIG. 4(c), the prismatic portion 312 has a cross section of an equilateral triangle, and the level adjustment hole 331 has a plurality of notches 3311 in the vertical direction at a predetermined pitch, into which a pair of adjacent corners of the prismatic portion 312 fit. The upper end of the level adjustment hole 331 is notched so that all corners of the prismatic portion 312 fit, and the lower end (not shown) is notched so that the pair of corners fit. The level adjustment hole 331 has a triangular notched recess 3312 with two sides of different lengths between the upper and lower notched portions 3311. The innermost end of the notched recess 3312 is pointed, so that the overlapping allowance of the prismatic portion 312 can be adjusted to a desired length.

[0041] Note that this embodiment is not limited to the above-described content, and includes the positions, shapes, and dimensions of all parts, the relationships between parts, the steps required for use, and the relationships between steps, as long as the same effects are obtained. [Explanation of symbols]

[0042] 1 volt 11 Head 12, 112, 212, 312 Square column 13 Threaded part 2 nuts 3 First plate material 31, 131, 231, 331 Level adjustment holes 311, 1311, 2311, 3311 Notch 312, 1312, 2312, 3312 Notched recess 32 First vertical plate 33 First horizontal plate part 4 Second plate material 41 Fitting hole (insertion hole) 42 Second vertical plate section 43 Second horizontal plate part P piping UU Bolt Q Anchor Bolt G ground

Claims

1. A bolt having a rectangular column portion with a cross section of at least a square at its base and a nut fastened to the bolt; a first plate member having a level adjustment hole into which the bolt passes and into which the rectangular column portion fits; a second plate member having an insertion hole through which the bolt passes; The level adjustment hole has a plurality of notches at a predetermined pitch in the height direction into which a pair of opposing corners of the rectangular column portion or corners located at both ends of each of a pair of opposing face portions fit. Level adjustment mechanism.

2. a bolt having a triangular cross-section formed at its base and a nut fastened to the bolt; a first plate member having a level adjustment hole into which the bolt passes and into which the rectangular column portion fits; a second plate member having an insertion hole through which the bolt passes; The level adjustment hole has a plurality of notches in the height direction at a predetermined pitch into which a pair of adjacent corners of the rectangular column portion fit. Level adjustment mechanism.

3. The insertion hole is a fitting hole into which the rectangular column portion fits.

3. The level adjustment mechanism according to claim 1 or 2.

4. The minimum horizontal width between the plurality of notches adjacent in the height direction in the level adjustment hole is greater than the diameter of the threaded portion of the bolt.

3. The level adjustment mechanism according to claim 1 or 2.

5. The pitch of the notches into which the pair of opposing corners fit is 3 to 10 mm.

3. The level adjustment mechanism according to claim 1 or 2.

6. A level adjustment method using the level adjustment mechanism according to claim 1 or 2, a step of overlapping the first plate material and the second plate material; inserting the bolt into the level adjustment hole and the insertion hole; a step of fitting the prismatic portion into the level adjustment hole; and fastening the bolt and the nut together. How to adjust the level.

7. A pipe support provided with the level adjustment mechanism according to claim 1 or 2, The first plate member has a first vertical plate portion in which the level adjustment hole is formed and a first horizontal plate portion that is continuous with and perpendicular to a lower end of the first vertical plate portion, The second plate member has a second side plate portion in which the insertion hole is formed, and a second horizontal plate portion that is continuous with and perpendicular to an upper end of the second side plate portion. Piping support.

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