Top surface level indicator

Abstract

The structure of the mounting bracket for the top surface level indicator will be simplified. [Solution] The top level indicator 200 has a main body 210 which is attached to a plate portion 112 having a through hole 112a of a mounting bracket 100 and has a shaft portion 211, a contact surface portion 212 with the plate portion 112, a folded portion 213, and an insertion portion 215 which is inserted into the through hole 112a, and an indicator member 220 which is slidable and fixed to the shaft portion 211, and on the side opposite to the folded portion 213 of the insertion portion 215, a constricted shape portion 215a is formed at the base into which the inner edge of the through hole 112a fits, and an inclined surface 215b is formed at the tip which is inclined in a direction approaching the folded portion 23.

Description

Technical Field

[0001] The present invention relates to a top-level display tool for displaying the top level when placing concrete to construct a floor slab.

Background Art

[0002] As a top-level display tool for displaying the top level, a large-diameter through hole provided in the upper plate portion of a mounting fitting attached to a reinforcing bar and a small-diameter through hole provided in the lower plate portion are used to insert a stepped portion of a round bar-shaped main body of a top pointer to erect the round bar-shaped main body, and a display member indicating the level of the top is fixed at a predetermined height position on the top pointer (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the configuration where the round bar-shaped main body of the top pointer is inserted into the large-diameter through hole in the upper plate portion and the small-diameter through hole in the lower plate portion of the mounting fitting as described above to be erected, it is necessary to form the upper plate portion and the lower plate portion on the mounting fitting, and the structure of the mounting fitting tends to become complicated.

[0005] The present invention has been made in view of the above points, and aims to make it possible to easily simplify the structure of the mounting fitting of the top-level display tool.

Means for Solving the Problems

[0006] To achieve the above object, The present invention A top surface level indicator that is attached to a mounting bracket attached to a reinforcing bar to indicate the top surface level, A shaft-shaped main body portion is attached to the plate portion in which the through hole is formed in the above mounting bracket, A display member is provided on the main body so as to be slidable and fixed, Equipped with, The main body described above is The mounting bracket has a contact surface portion which contacts the plate portion, The above contact surface portion has a folded portion that folds back at the edge of the plate portion of the mounting bracket and wraps around to the opposite side of the plate portion, An insertion portion that protrudes from the above contact surface and is inserted into the above through hole of the plate portion of the mounting bracket, A shaft portion is erected in the direction opposite to the insertion portion from the above contact surface portion, It is characterized by having the following features.

[0007] This allows the top level indicator to be fixed to the mounting bracket by inserting the insertion part into the through hole in the plate portion of the mounting bracket and bringing the contact surface portion into contact with the surface of the plate portion, thereby simplifying the structure of the mounting bracket. [Effects of the Invention]

[0008] In this invention, the structure of the mounting bracket for the top level indicator can be easily simplified. [Brief explanation of the drawing]

[0009] [Figure 1] Front view of the top surface level indicator 200 attached to the mounting bracket 100. [Figure 2] An enlarged cross-sectional view showing the insertion state of the insertion part 215 of the top surface level indicator 200. [Figure 3] An enlarged cross-sectional view showing the insertion process of the insertion part 215 of the top surface level indicator 200. [Figure 4] Plan view of the display component 220. [Figure 5] Figure 4 shows the end view taken along the VV arrow. [Figure 6] Front view of the top surface level adjustment tool 300. [Figure 7] Figure 6, end view taken along the line VII-VII. [Figure 8] Figure 7 shows the end view taken along the line VIII-VIII. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0011] The top level indicator 200 comprises, for example, as shown in Figure 1, a main body 210 erected on the plate portion 112 of a mounting bracket 100 attached to reinforcing bars 400 such as slab reinforcement, and a display member 220 fixed at a predetermined height position on the shaft portion 211 of the main body 210. More specifically, the height of the concrete to be poured can be managed by sliding the display member 220 on the shaft portion 211 of the main body 210 and fixing the flange portion 222 at a predetermined height position.

[0012] The mounting bracket 100 has, for example, an upper jaw portion 110 and a lower jaw portion 120 formed by bending a steel plate. A flange nut 130 is attached to an elongated hole 120a formed in the lower jaw portion 120, and a bolt 140 is inserted through a bolt hole formed in the upper jaw portion 110. By screwing these together, the reinforcing bar 400 is sandwiched between the protrusion 111 of the upper jaw portion 110 and the protrusion 121 of the lower jaw portion 120, thereby securing the bracket. The upper jaw portion 110 is provided with a plate portion 112 having a through hole 112a. Although not essential, a plate portion 113 perpendicular to the plate portion 112 may be provided in place of, or together with, the plate portion 112, so that the top level indicator 200 can also be attached when the mounting bracket 100 is fixed to the reinforcing bar 400 arranged vertically.

[0013] Here, the height position of the seating surface where the bolt head of the bolt 140 abuts in the upper jaw portion 110 is set lower than, for example, the plate portion 112, so that the upper surface of the bolt head and the plate portion 112 are substantially at the same height. As a result, it becomes possible to easily attach the bolt 140 in the vertical direction and tighten the bolt with an electric rotary tool from directly above without interfering with the reinforcing bar 400.

[0014] The long hole 120a of the lower jaw portion 120 is formed to have a width slightly wider than the two-sided width of the flange nut 130, so that the two-sided width portion of the flange nut 130 fits in and is prevented from rotating. Further, a wall portion 120b that rises by burring (flanging) is formed on the inner peripheral portion of the long hole 120a. The flange portion of the flange nut 130 is configured such that when the convex surface side abuts against the edge portion of the wall portion 120b, an appropriate fastening state can be easily obtained even when the upper jaw portion 110 and the lower jaw portion 120 form an angle in a wide range. Therefore, it is possible to easily attach the mounting bracket 100 to reinforcing bars 400 of various diameters.

[0015] The main body portion 210 of the top-end level indicator 200 erected on the plate portion 112 has a rod-shaped shaft portion 211, a contact surface portion 212 that abuts against the surface of the plate portion 112, a folded-back portion 213 where the contact surface portion 212 is folded back at the edge of the plate portion 112 of the mounting bracket 100 and turns into the opposite surface side of the plate portion 112, and an insertion portion 215 that is inserted into the through-hole 112a of the plate portion 112. Further, although not essential, a constricted portion 211b is formed near the base of the shaft portion 211. At the tip of the shaft portion 211, an inverted triangular head portion 216 that expands toward the tip is provided. The shape of the head portion 216 may be a shape such as a T-shaped that is easy to hook a finger and pull up. However, when it is an inverted triangular shape as described above, that is, when an inclination is provided on the lower side, even when an electric cord, a hose, etc. are caught on the head portion 216, the catch can be easily released, and it is possible to easily prevent the top-end level indicator 200 from being inadvertently detached.

[0016] As shown in FIG. 2, in the insertion portion 215 of the main body portion 210, a constricted shape portion 215a into which the inner peripheral edge of the through hole 112a of the plate portion 112 fits is formed at the base portion on the side opposite to the folded-back portion 213, and an inclined surface 215b that inclines in the direction approaching the folded-back portion 213 is formed at the tip portion. Further, although not essential, a groove portion 214 is formed on the side opposite to the contact surface with the mounting bracket 100 at the connection portion between the contact surface portion 212 and the folded-back portion 213.

[0017] As shown in FIG. 3, the main body portion 210 as described above is formed such that the tip portion of the folded-back portion 213 is brought into contact with the lower surface of the plate portion 112 and rotated as indicated by arrow A in the figure with that portion as a fulcrum. When the insertion portion 215 is inserted into the through hole 112a, the insertion portion 215 has a length below a predetermined value, and in addition, since the inclined surface 215b is formed, it is difficult to interfere with the inner peripheral edge of the through hole 112a. When the groove portion 214 is formed at the connection portion between the contact surface portion 212 and the folded-back portion 213, further, since bending is likely to occur in the vicinity of the groove portion 214, the insertion operation can be performed relatively easily.

[0018] Furthermore, when the insertion portion 215 is inserted until the contact surface portion 212 of the main body portion 210 contacts the plate portion 112, the tip of the folded portion 213 contacts the lower surface of the plate portion 112, and the inner periphery of the through hole 112a fits into the constricted portion 215a. As a result, even when an external force acts that would cause the shaft portion 211 to tip over, the insertion portion 215 is less likely to come out of the through hole 112a, preventing the top level indicator 200 from tipping over. Even if the insertion portion 215 does not have a constricted shape 215a, that is, if the outer shape of the insertion portion 215 is formed substantially uniformly in the longitudinal direction, if the insertion portion 215 has a length greater than a predetermined length, and the gap between the outer shape of the insertion portion 215 and the inner periphery of the through hole 112a is small enough or in a press-fit state, the effect of suppressing the tilting of the top level indicator 200 can be obtained by the contact between the outer shape of the insertion portion 215 and the inner periphery of the through hole 112a, and the contact between the contact surface portion 212 and the plate portion 112 of the mounting bracket 100. Furthermore, if a constricted portion 211b is formed near the base of the shaft portion 211, the tilting of the top level indicator 200 is also less likely to occur because that portion is more flexible.

[0019] Furthermore, even if a force is applied to the main body 210 in a direction that pulls it almost straight up, as long as that force is below a certain level, the folded portion 213 prevents the main body 210 from coming out of the through hole 112a of the mounting bracket 100.

[0020] On the other hand, if a force greater than a certain amount acts on the main body 210 in a direction that pulls it almost directly upward, the bending of the folded portion 213 and / or the force that causes the inner edge of the through hole 112a to shift relative to the slope of the constricted portion 215a will easily release the engagement of the folded portion 213 with the plate portion 112. Therefore, it is relatively easy to pull out the top level indicator 200 after the concrete has been poured.

[0021] As shown in Figure 4, the shaft portion 211 of the main body portion 210 is formed in a cross-sectional shape having a width across flats 211a. On the other hand, the display member 220 is formed so as to have a recess 221a on the inner circumference side of the partial cylindrical portion 221 corresponding to the width across flats 211a. The partial cylindrical portion 221 and the flange portion 222 are reinforced by a rib 223. The display member 220 described above can be fitted onto the shaft portion 211 of the main body portion 210 through the opening of the partial cylindrical portion 221 and rotated around the axis of the main body portion 210, thereby switching between a state in which it can slide in the axial direction and a state in which its position in the axial direction can be fixed. The shape of the recess 221a of the display member 220 corresponding to the width across flats 211a of the main body portion 210 may be formed along the entire length of the partial cylindrical portion 221, but it may also be formed as a claw portion 224 that is thinner than the entire length of the partial cylindrical portion 221, as shown in Figure 5, for example. In this case, it is easy to reduce the force required to rotate the display member 220 around the shaft portion 211 of the main body portion 210, and it is also easy to prevent the height position of the display member 220 from shifting by allowing the claw portion 224 to bite into the shaft portion 211 to some extent when it is fixed.

[0022] When adjusting the top level using the top level indicator 200 as described above, for example, a leveling rod is placed against the indicator member 220, and the laser beam of a laser surveying instrument is shone onto the leveling rod or the light-receiving part attached to the leveling rod. The indicator member 220 is then slid against the shaft 211 so that the lower surface of the flange portion 222 of the indicator member 220 (or the upper surface of the flange portion 222 if the indicator member 220 is mounted upside down compared to Figure 1) is at a predetermined height. After that, the flange portion 222 is rotated 90° around the axis of the shaft 211 to fix the height position, thereby providing a reference height for when pouring concrete.

[0023] Incidentally, in the adjustment work described above, if the difference between the height at which the laser beam is irradiated and the height at which the top level indicator 200 is installed is long, even if it is difficult to reach the indicator member 220 of the top level indicator 200 in a posture that allows for confirmation by visually observing the laser beam, the adjustment work can be easily performed by one person by using the top level adjustment tool 300 shown in Figure 6.

[0024] The top level adjustment tool 300 described above has a holding portion 310 for holding the display member 220 and a grip portion 320 connected by a shaft member 330, and the shaft member 330 is supported by a cylindrical body portion 340 so as to be rotatable and constrained in the axial direction. The body portion 340 may be provided with a measuring rod scale and / or a laser light receiving portion may be attached or made attachable. The measuring rod scale is not particularly limited and should be formed in such a way as to allow confirmation of the height position. The holding portion 310 is provided with side wall portions 311 that clamp the flange portion 222 of the display member 220 from both sides at intervals corresponding to the width dimension of the display member 220. In addition, upper and lower wall portions 312 are provided that clamp both sides of the flange portion 222 from above and below at intervals corresponding to the thickness of the flange portion 222 of the display member 220. As a result, by moving the holding portion 310 relative to the flange portion 222 in the direction indicated by arrow B in Figure 7, the display member 220 is held so as to be constrained in the rotational and axial directions. Therefore, by moving the holding portion 310 in the axial direction, the display member 220 can be slid along the main body portion 210. Furthermore, by rotating the holding portion 310 around the shaft member 330, the display member 220 can be switched between a slidable state and a fixed state relative to the main body portion 210.

[0025] Therefore, for example, one worker can easily check the laser beam while standing, adjust the display member 220 of the top level indicator 200 to a desired height position, and switch from a sliding state to a fixed state. [Explanation of Symbols]

[0026] 100 Mounting bracket 110 Maxillary region 111 Convex part 112 Board part 112a Through hole 113 Board part 120 Mandible 120a long hole 120b Wall section 121 Convex part 130 Flange Nut 140 volts 200 Top surface level indicator 210 Main body 211 Shaft 211a Width across flats 211b Constricted area 212 Contact surface part 213 Folding section 214 Groove 215 Insertion part 215a Constricted section 215b Slope 216 Head 220 Display component 221 Partial cylindrical section 221a Recess 222 Guard section 223 Rib 224 Nail part 300 Top surface level adjustment tool 310 Holding part 311 Side wall section 312 Upper and lower wall sections 320 Grip section 330 Shaft member 340 Torso 400 reinforcing bars

Claims

1. A top surface level indicator that is attached to a mounting bracket attached to a reinforcing bar to indicate the top surface level, A shaft-shaped main body portion is attached to the plate portion in which the through hole is formed in the above mounting bracket, A display member is provided on the main body so as to be slidable and fixed, Equipped with, The main body described above is The mounting bracket has a contact surface portion which contacts the plate portion, The above contact surface portion has a folded portion that folds back at the edge of the plate portion of the mounting bracket and wraps around to the opposite side of the plate portion, An insertion portion that protrudes from the above contact surface and is inserted into the above through hole of the plate portion of the mounting bracket, A shaft portion is erected in the direction opposite to the insertion portion from the above contact surface portion, A top surface level indicator characterized by having the following features.

2. A top surface level indicator according to claim 1, The insertion portion of the main body is characterized in that, on the side opposite to the folded portion, a constricted shape is formed at the base into which the inner edge of the through hole of the mounting bracket fits, and an inclined surface is formed at the tip that slopes toward the folded portion.

3. A top surface level indicator according to claim 1, The shaft portion of the main body described above is formed such that its cross-sectional shape has two widths. The above-mentioned display member is formed to have a recess on its inner circumference that corresponds to the above-mentioned two-sided width, The top surface level indicator is characterized in that the above-mentioned display member can be switched between a state in which it can slide in the axial direction and a state in which its position in the axial direction can be fixed by rotating the display member around the axis of the main body.

4. A top surface level indicator according to claim 1, A top surface level indicator characterized by having a constricted portion formed at the base of the shaft portion of the main body described above.

5. A top surface level indicator according to claim 1, The top level indicator is characterized in that the tip of the shaft portion of the main body is provided with an inverted triangular head that widens toward the tip.

6. A top surface level indicator according to claim 1, A top surface level indicator characterized in that a groove is formed on the side opposite to the contact surface with the mounting bracket at the connection point between the contact surface and the folded portion of the main body.

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