Measuring jig

Abstract

To provide a mold inspection jig capable of easily positioning a total station (TS) photoreceiver at an arbitrary part of a concrete mold.SOLUTION: A mold inspection jig 10 used when a total station (TS) photoreceiver 30 is installed to a mold 20 includes: a jig body 11 shaped into an almost cross in planer view, which has a holding part 112 for positioning a tip of the TS photoreceiver 30 at the center so as to hold it and which includes four leg parts 111 radially extending from the center; and four sandwiching parts 12 which are arranged around the holding part 112 in the jig body 11 and which can sandwich the mold 20 by respectively moving along longitudinal directions of the leg parts 111. Each of the sandwiching parts 12 maintains the same distance as a distance to the holding part 112 when sandwiching the mold 20.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a form inspection tool used when installing surveying tools in a concrete form. [Background technology]

[0002] As a surveying system that performs triangulation, for example, a surveying system using a total station (TS) is known, and this surveying system is also used for surveying foundation work (for example, Patent Document 1). A total station is a surveying instrument that measures angles and distances, and can measure position information by emitting a laser beam from the TS main unit and capturing this laser beam with a TS receiver. In an automatic tracking type TS, the position information of the TS receiver can also be displayed on the screen of a terminal (smartphone, etc.) that is wirelessly connected to the TS main unit. By following the guidance displayed on the terminal screen, workers can position piles, perform roping work, and check construction accuracy.

[0003] To check the construction accuracy of foundation work, a TS receiver is installed at the core of the foundation, and as shown in Figure 10, the length of the foundation, such as the side length and diagonal, the distance to the site boundary line, and the height of the foundation top are measured. Since the construction position cannot be corrected after the concrete is poured, it is particularly important to check the accuracy before pouring the concrete. For this reason, the TS receiver needs to be positioned relative to the core of the foundation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-73151 A Summary of the Invention [Problem to be solved by the invention]

[0005] When using a total station to check the construction accuracy of foundation work, the following issues arise:

[0006] (Issue 1) Generally, in the foundation construction stage before concrete is poured, a ruler is placed on top of the concrete formwork (hereinafter sometimes abbreviated as formwork) and the formwork and ruler are fixed together to suppress the movement of the formwork and ensure the accuracy of concrete construction. However, even if you try to place the TS receiver along the ruler, depending on the specifications of the foundation, there may be cases where the ruler is not located at the center position and the foundation is hollow, making it impossible to place the tip of the TS receiver on the center of the foundation / formwork and therefore impossible to measure the position.

[0007] (Task 2) When the above (Problem 1) occurs, it is possible to use a plate material called a "width stop" that clamps the top of the formwork as a jig and install the TS receiver on top of it. However, while this type of "width stop" can be used in general sections (Fig. 11(a)), its dimensions are insufficient for entrance and exit corners (Fig. 11(b)), T-shaped sections (Fig. 11(c)), and cross sections (Fig. 11(d)), and it cannot fit into the right-angled parts of the formwork. In other words, the TS receiver cannot be positioned at any point in the concrete formwork.

[0008] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a formwork inspection jig that can easily position a TS receiver at any location in a concrete formwork. [Means for solving the problem]

[0009] In order to solve the above problems, the formwork inspection jig disclosed herein is a formwork inspection jig used when installing a surveying tool against a concrete formwork, and comprises a jig body having a holding portion in the center for positioning and holding the tip of the surveying tool, and which is approximately cross-shaped in a plan view including four legs extending radially from the center, and four clamping portions are arranged around the holding portion on the jig body, and each of the clamping portions can clamp the concrete formwork by moving along the longitudinal direction of the legs, and each of the clamping portions is maintained at the same distance from the holding portion when clamping the concrete formwork.

[0010] According to the above configuration, the form inspection jig can be attached to the concrete form by clamping it with four clamping parts. Since the position of the clamping parts can be adjusted according to the size of the concrete form (frame width at the clamping part), the form inspection jig can be attached to any part of the concrete form. Furthermore, since the distance between each clamping part and the holding part is kept the same, the surveying tool (e.g., TS receiver) can be easily positioned relative to the concrete form.

[0011] In addition, in the above-mentioned formwork inspection jig, the clamping portion has a formwork side surface abutment portion that abuts against the side surface of the concrete formwork, and the formwork side surface abutment portion is freely rotatable around a rotation axis perpendicular to the longitudinal direction of the jig body, and the cross section perpendicular to the rotation axis can be configured to be approximately L-shaped.

[0012] According to the above configuration, by rotating the formwork side abutment portion having an approximately L-shaped cross section, it is possible to stably attach the jig to any location of the concrete formwork (general parts, entrance / exit corners, T-shaped parts, cross parts, etc.).

[0013] In addition, in the above-mentioned formwork inspection jig, each of the clamping parts is biased toward the holding part by a compression spring having the same natural length and spring constant, and when the clamping parts clamp the concrete formwork, the spring forces of the compression springs become equal, thereby maintaining the same distance from the holding part.

[0014] In addition, the formwork inspection jig can be provided with an interlocking section that moves the other three clamping sections in conjunction with each other when one of the clamping sections is moved, and the interlocking section can be configured to interlock the four clamping sections so that the distance between each clamping section and the holding section is maintained at the same distance.

[0015] In addition, in the above-mentioned formwork inspection jig, the interlocking portion includes three belt members connecting any two of the four clamping portions, and each of the clamping portions is connected to at least one of the three belt members, and each of the belt members can be configured to maintain a constant distance along a predetermined path between the two connected clamping portions.

[0016] In addition, in the above-mentioned formwork inspection jig, the interlocking portion can be configured to include a pinion gear journaled on the jig body, and a rack gear arranged along the leg portion, connected to each of the clamping portions, and meshing with the pinion gear.

[0017] Furthermore, in the above-mentioned form inspection jig, each of the clamping parts can be configured so that its position can be adjusted in a direction parallel to the rotation axis relative to the jig body.

[0018] According to the above configuration, the horizontality of the jig body can be adjusted by adjusting the height of the clamping portion. Effect of the Invention

[0019] The formwork inspection tool disclosed herein has an advantage that the position of the clamping parts can be adjusted according to the size of the concrete formwork, and the distance between each clamping part and the holding part is maintained at the same distance, making it easy to position a surveying tool (e.g., a TS receiver) relative to the concrete formwork. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a plan view showing a schematic configuration of a form inspection jig according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a rear view showing a schematic configuration of the formwork inspection jig. [Diagram 3] FIG. 2 is a cross-sectional view showing a schematic configuration of a formwork inspection jig. [Figure 4] 5 is a schematic cross-sectional view showing a state in which a set nut is fitted in a slit of a jig body. FIG. [Diagram 5]1 is a schematic cross-sectional view showing a state in which a formwork inspection jig is attached to a concrete formwork. FIG. [Figure 6] 1A to 1E are plan views each showing a schematic state in which a form inspection jig is attached to a form. [Figure 7] FIG. 2 is a schematic diagram showing a first configuration example of a centering mechanism in a form inspection jig. [Figure 8] FIG. 11 is a schematic diagram showing a second configuration example of a centering mechanism in a form inspection jig. [Figure 9] FIG. 11 is a schematic diagram showing a third configuration example of a centering mechanism in a form inspection jig. [Figure 10] FIG. 13 is an explanatory diagram showing an example of surveying points for checking the construction accuracy of foundation work. [Figure 11] 13(a) to 13(d) are plan views showing the possible arrangement of width stoppers relative to a formwork. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings. FIG. 1 is a plan view showing a schematic configuration of a formwork inspection jig 10 according to an embodiment of the present disclosure. FIG. 2 is a rear view showing a schematic configuration of the formwork inspection jig 10. FIG. 3 is a cross-sectional view (III-III cross section in FIGS. 1 and 2) showing a schematic configuration of the formwork inspection jig 10. The formwork inspection jig 10 is a jig used when installing a surveying tool on a formwork 20 (see FIG. 5), which is a concrete formwork, in triangulation surveying or the like. In this embodiment, a surveying system using a total station (TS) is exemplified, and the formwork inspection jig 10 is used to install a TS receiver 30 (see FIG. 5), which is a surveying tool. However, application of the present invention is not limited to a surveying system using a total station (TS). In the following description, the up-down direction means the direction in a state in which the formwork inspection jig 10 is attached to the formwork 20.

[0022] As shown in Figures 1 to 3, the formwork inspection jig 10 is configured with a jig body 11 that is approximately cross-shaped in a planar view, including four legs 111 extending radially from the center, and four clamping portions 12 that are attached to the jig body 11 so as to be able to slide relative to the jig body 11.

[0023] The jig body 11 has a holding portion 112 on its upper surface at the center in the longitudinal direction for positioning and holding the tip of the TS receiver 30. In this embodiment, the holding portion 112 is formed as a recess, and the tip of the TS receiver 30 can be positioned by fitting the pole tip of the TS receiver 30 into this recess.

[0024] Further, a slit 113 is formed in each leg 111 of the jig body 11. That is, four slits 113 are formed in the jig body 11 around the holding part 112. Each slit 113 is formed along the longitudinal direction of the leg 111, and passes through the jig body 11 in the vertical direction. The clamping parts 12 are slidably attached to the slits 113. The clamping parts 12 are slidably moved along the longitudinal direction of the leg 111 by being guided by the slits 113, and the four clamping parts 12 are arranged around the holding part 112, so that the formwork 20 can be clamped.

[0025] The clamping portion 12 has a core 121, a set nut 122, and a formwork side surface abutment portion 123.

[0026] The core 121 is a rod-shaped member whose longitudinal direction is the vertical direction, and includes, from the top, a knob 1211, a male threaded portion 1212, a formwork top surface abutment portion 1213, a shaft portion 1214, and a flange portion 1215. The knob 1211 is an operating knob portion that is held by a user when operating the clamping portion 12. A set nut 122 is screwed into the male threaded portion 1212. The formwork top surface abutment portion 1213 is used for positioning in the vertical direction when the formwork inspection jig 10 is attached to the formwork 20. The shaft portion 1214 serves as a rotation axis for the formwork side surface abutment portion 123. The flange portion 1215 prevents the formwork side surface abutment portion 123 from falling off the shaft portion 1214.

[0027] The set nut 122 is attached so as to be slidable along the slit 113, and its movement in the vertical direction relative to the slit 113 is restricted. As a specific example, as shown in FIG. 4, the slit 113 has a substantially cross-shaped cross section in a cross section perpendicular to the longitudinal direction of the jig body 11 (cross section IV-IV in FIGS. 1 and 2), and the set nut 122 is fitted into the wide portion of this cross-shaped cross section. This restricts the set nut 122 from moving in the vertical direction relative to the slit 113. The set nut 122 is a hexagonal nut, and the distance between two opposing sides of the hexagon is approximately equal in size to the wide portion of the slit 113. This prevents the set nut 122 from rotating around its axis within the slit 113.

[0028] The formwork side surface abutment part 123 is attached to the core 121 so as to be freely rotatable about the shaft part 1214 as a rotation axis. The formwork side surface abutment part 123 is formed in a substantially L-shape with a bending angle of 90° at the corner part in a plan view (i.e., when viewed from a direction parallel to the rotation axis), and the rotation axis of the formwork side surface abutment part 123 is provided at the corner part of the L shape. In addition, the distances from the corner parts of the L shape to both ends of the L shape are equal.

[0029] Fig. 5 is a schematic cross-sectional view showing a state in which the form inspection jig 10 is attached to a form 20. Note that Fig. 5 shows a cross section along the longitudinal direction of two legs 111 facing each other.

[0030] The formwork inspection jig 10 is attached so as to sandwich the formwork 20 between four clamping parts 12 (two of which are shown in FIG. 5). At this time, the formwork inspection jig 10 is positioned in the vertical direction by placing the formwork top surface abutting part 1213 on the top surface of the formwork 20. The formwork side surface abutting part 123 abuts against the side surface of the formwork 20. In the formwork inspection jig 10 attached to the formwork 20, the pole tip of the TS receiver 30 can be fitted into the holding part 112, which is a recess. By using the formwork inspection jig 10 in this manner, the TS receiver 30 is installed relative to the formwork 20. Note that a male thread may be formed at the pole tip of the TS receiver 30, and the holding part 112 may be formed as a female thread. In this case, the TS receiver 30 can be easily made upright relative to the main surface of the jig body 11 by screwing the pole tip of the TS receiver 30 to the holding part 112.

[0031] In addition, although details will be described later, the formwork inspection jig 10 includes a centering mechanism for maintaining the same distance between each of the clamping parts 12 and the holding part 112 when the clamping parts 12 clamp the formwork 20. Here, the distance between the clamping parts 12 and the holding part 112 is the distance L1 between the rotation axis of the clamping parts 12 and the central axis of the holding part 112. For example, with respect to the two clamping parts 12 shown in FIG. 5, the centering mechanism maintains the same distance between the distance L1 between one of the clamping parts 12 and the holding part 112 and the distance L1 between the other clamping part 12 and the holding part 112. Also, with respect to the remaining two clamping parts 12 not shown in FIG. 5, the distance L1 between the clamping parts 12 and the holding part 112 is maintained the same. This allows the formwork inspection jig 10 to easily center the TS receiver 30 with respect to the formwork 20.

[0032] Furthermore, the formwork inspection jig 10 can adjust the height or level of the jig body 11 by rotating the core 121 of the clamping portion 12 and changing the relative position between the male thread portion 1212 of the clamping portion 12 and the set nut 122. The level adjustment of the jig body 11 can be performed, for example, by placing a vial level 40 on the upper surface of the jig body 11 and checking the air bubble on the vial level 40.

[0033] The formwork inspection jig 10 of this embodiment can be attached by clamping the formwork 20 between four clamping parts 12, and the position of the clamping parts 12 can be adjusted according to the size of the formwork 20 (frame width at the clamping part). Therefore, the formwork inspection jig 10 can be attached to any part of the formwork 20 (general part, in-out corner, T-shaped part, cross part, etc.). In addition, in the clamping parts 12, the formwork side surface abutting part 123 is freely rotatable around the shaft part 1214, and the cross section perpendicular to the shaft part 1214 is substantially L-shaped. Then, by rotating the formwork side surface abutting part 123, the formwork inspection jig 10 can be stably attached to any part of the formwork 20.

[0034] 6(a) to (e) are plan views showing schematic views of the attachment of the formwork inspection jig 10 to the formwork 20. FIGS. 6(a) and 6(b) show the formwork inspection jig 10 attached to the general portion of the formwork 20. FIG. 6(c) shows the formwork inspection jig 10 attached to an entrance / exit corner of the formwork 20. FIG. 6(d) shows the formwork inspection jig 10 attached to a T-shaped portion of the formwork 20. FIG. 6(e) shows the formwork inspection jig 10 attached to a cross portion of the formwork 20. In FIGS. 6(a) to (e), the jig body 11 is shown by virtual lines so that the orientation of the formwork side surface abutment portion 123 of the formwork inspection jig 10 can be easily seen.

[0035] 6(a) to 6(e), in the form inspection jig 10 attached to the form 20, the clamping parts 12 are kept at the same distance from the holding part 112. This makes it possible to easily position the holding part 112 for installing the TS receiver 30 at the center of the form 20 in the width direction.

[0036] Next, a configuration example of the centering mechanism in the formwork inspection jig 10 will be described below.

[0037] (Centering mechanism configuration example 1) Fig. 7 is a schematic diagram showing a first configuration example of a centering mechanism in a form inspection jig 10. In the example shown in Fig. 7, the set nuts 122 in each of the clamping parts 12 are connected to each other by a plurality of belt members 13. More specifically, the form inspection jig 10 has three belt members 13A to 13C (collectively referred to as belt members 13 when no distinction is made) with set nuts 122 connected to both ends. Each set nut 122 is connected to at least one of the three belt members 13.

[0038] In the example of Fig. 7, one of the four set nuts 122 is set nut 122A, and the other three set nuts 122 are set nut 122B, set nut 122C, and set nut 122D in clockwise order from set nut 122A. Belt member 13A connects set nuts 122A and 122B. Belt member 13B connects set nuts 122A and 122C. Belt member 13C connects set nuts 122A and 122D.

[0039] Moreover, the formwork inspection jig 10 has a plurality of first cylindrical portions 114 (three in the example of FIG. 7) provided on the outer side (opposite side to the holding portion 112) in the longitudinal direction with respect to any one of the slits 113 in the jig body 11, and a second cylindrical portion 115 provided in the center of the jig body 11. The belt member 13 (belt member 13B in the example of FIG. 7) connecting the pre-loaded nuts 122 arranged in the two opposing slits 113 has a function of keeping the distance between the two clamping portions 12 constant along a predetermined path that goes around the outside of the first cylindrical portion 114. The belt member 13 (belt members 13A and 13C in the example of FIG. 7) connecting the pre-loaded nuts 122 arranged in the two orthogonal slits 113 has a function of keeping the distance between the two clamping portions 12 constant along a predetermined path that goes around the outside of the first cylindrical portion 114 and the second cylindrical portion 115.

[0040] The belt member 13 is made of a material that has high flexibility and low stretchability in the longitudinal direction. In addition, it is preferable that the belt member 13 does not bend or flex in the straight portion shown in Fig. 7. For this reason, the belt member 13 can be preferably a metal belt having a convex cross section, such as that used for a convex. In this configuration example 1, the belt member 13 corresponds to the interlocking portion described in the claims.

[0041] In the centering mechanism of Configuration Example 1, when one clamping portion 12 is moved along the longitudinal direction of slit 113, the other three clamping portions 12 also move via belt member 13. At this time, the four clamping portions 12 all move inward (toward holding portion 112) or outward (away from holding portion 112), and the movement distances are the same. That is, the centering mechanism makes it possible to always maintain the distance L1 between each of the clamping portions 12 and holding portion 112 at the same distance.

[0042] In the above-mentioned centering mechanism, it is preferable to dispose the belt member 13, the first cylindrical portion 114, and the second cylindrical portion 115 inside the jig body 11. In other words, it is preferable to form a space inside the jig body 11, and to house the belt member 13, the first cylindrical portion 114, and the second cylindrical portion 115 in this space.

[0043] In addition, in this configuration example 1, the arrangement of the three belt members 13 is not limited to the example in Fig. 7, and any other arrangement example may be used. For example, the three belt members 13 may be (a) a belt member 13 connecting the set nuts 122A and 122B, (b) a belt member 13 connecting the set nuts 122B and 122C, and (c) a belt member 13 connecting the set nuts 122C and 122D. Alternatively, the three belt members 13 may be (a) a belt member 13 connecting the set nuts 122A and 122C, (b) a belt member 13 connecting the set nuts 122B and 122D, and (c) a belt member 13 connecting the set nuts 122A and 122D.

[0044] Furthermore, when the paths of the three belt members 13 overlap in a plan view, they are disposed with the paths shifted in the up-down direction. In the example of Fig. 7, the paths of the belt member 13C overlap with those of both the belt members 13A and 13B, so the position of the belt member 13C in the up-down direction is shifted with respect to both the belt members 13A and 13B. Furthermore, the paths of the belt members 13A and 13B do not overlap with each other in a plan view, so they may be disposed at the same position in the up-down direction.

[0045] (Centering mechanism configuration example 2) Fig. 8 is a schematic diagram showing a second configuration example of the centering mechanism in the formwork inspection jig 10. In the example shown in Fig. 8, a compression spring 14 is disposed in a slit 113 on the outside of the preloaded nut 122 (the side opposite the holding portion 112) of the preloaded nut 122 in each of the clamping portions 12. As a result, each of the clamping portions 12 is biased toward the holding portion 112 by the compression spring 14. In this configuration example, the distances L2 between the outer ends of the respective slits 113 and the holding portion 112 are set to be equal to each other. Moreover, the two compression springs 14 are the same type of springs with equal natural lengths and spring constants.

[0046] In the centering mechanism of this configuration example 2, when the form inspection jig 10 is attached to the form 20, the spring forces generated in the four compression springs 14 become stable when they are equal. At this time, since the four compression springs 14 are the same type of spring, the spring lengths L3 of the compression springs 14 are equal to each other. As shown in Fig. 8, when all L2 are equal and all L3 are equal, it is possible to maintain the distance L1 between all clamping parts 12 and the holding parts 112 at the same distance.

[0047] (Centering mechanism configuration example 3) Fig. 9 is a schematic diagram showing a configuration example 3 of the centering mechanism in the form inspection jig 10. In the example shown in Fig. 9, a pinion gear 151 is provided at the center of the four slits 113, and a rack gear 152 is provided on each of the set nuts 122 of the clamping part 12, extending inward along the longitudinal direction of the slits 113 (i.e., arranged along the leg parts 111). The four rack gears 152 are provided symmetrically at 90° intervals around the pinion gear 151, and all of them mesh with the pinion gear 151. In this configuration example 3, the pinion gear 151 and the rack gear 152 correspond to the interlocking part recited in the claims.

[0048] In the centering mechanism of configuration example 3, when one clamping unit 12 is moved along the longitudinal direction of slit 113, the other three clamping units 12 also move via pinion gear 151 and rack gear 152. At this time, the four clamping units 12 all move inward (toward holding unit 112) or outward (away from holding unit 112), and the movement amounts are the same. That is, the centering mechanism makes it possible to always maintain the distance L1 between each of the clamping units 12 and holding unit 112 at the same distance.

[0049] In the centering mechanism, it is preferable to dispose the pinion gear 151 and the rack gear 152 inside the jig body 11. That is, it is preferable to form a space inside the jig body 11 and to house the pinion gear 151 and the rack gear 152 in this space. In addition, in the centering mechanism, the pinion gear 151 and the holding part 112 are arranged at positions that overlap each other in a plan view, so that the pinion gear 151 and the holding part 112 need to be configured so as not to interfere with each other in the vertical direction. For this reason, a convex part may be provided in the center of the upper surface of the jig body 11 (between the two slits 113), and the holding part 112 may be formed on the top surface of the convex part.

[0050] Furthermore, the four rack gears 152 are arranged with their paths vertically shifted if their paths overlap in a plan view. In the example of Fig. 10, the paths of two rack gears 152 arranged at 90° intervals from each other overlap, so their positions in the vertical direction are shifted. Also, the paths of two rack gears 152 arranged at 180° intervals from each other (opposite positions) do not overlap, so they may be arranged at the same positions in the vertical direction.

[0051] The embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present disclosure should not be interpreted solely by the above-described embodiments, but should be determined based on the claims.

[0052] The formwork inspection jig 10 of the present disclosure can be realized in various forms as described below.

[0053] (Appendix 1) A formwork inspection tool used when installing surveying tools on a concrete formwork, A jig body having a substantially cross shape in a plan view, the jig body having a holding portion at the center for positioning and holding the tip of the surveying tool and including four legs extending radially from the center; Four clamping parts are arranged around the holding part with respect to the jig body, and each of the clamping parts can clamp the concrete formwork by moving along the longitudinal direction of the leg part, A formwork inspection jig characterized in that each of the clamping parts is maintained at the same distance from the holding part when clamping the concrete formwork.

[0054] (Appendix 2) 2. A formwork inspection tool as described in claim 1, The clamping portion has a form side abutment portion that abuts against a side surface of the concrete formwork, A formwork inspection jig characterized in that the formwork side contact portion is freely rotatable around a rotation axis perpendicular to the longitudinal direction of the jig body, and the cross section perpendicular to the rotation axis is approximately L-shaped.

[0055] (Appendix 3) A formwork inspection tool according to claim 1 or 2, Each of the clamping parts is biased toward the holding part by a compression spring having the same natural length and spring constant, A formwork inspection jig characterized in that when the clamping portion clamps the concrete formwork, the spring forces of the compression springs become equal, thereby maintaining the same distance from the holding portion.

[0056] (Appendix 4) A formwork inspection tool according to claim 1 or 2, A linking unit is provided for linking and moving the other three clamping units when one of the clamping units is moved, A formwork inspection jig characterized in that the interlocking portion interlocks the four clamping portions so that the distance between each clamping portion and the holding portion is maintained at the same distance.

[0057] (Appendix 5) 5. A formwork inspection tool as described in appendix 4, The interlocking portion includes three belt members connecting any two of the four clamping portions, Each of the clamping portions is connected to at least one of the three belt members, A formwork inspection jig, characterized in that each of the belt members maintains a constant distance along a predetermined path between the two clamping portions to which it is connected.

[0058] (Appendix 6) 5. A formwork inspection tool as described in appendix 4, A formwork inspection jig characterized in that the interlocking portion includes a pinion gear journaled on the jig body, and a rack gear arranged along the leg portion, connected to each of the clamping portions, and meshing with the pinion gear.

[0059] (Appendix 7) A formwork inspection tool according to any one of appendices 1 to 6, A formwork inspection jig, characterized in that each of the clamping parts is capable of adjusting its position relative to the jig body in a direction parallel to the rotation axis. [Explanation of symbols]

[0060] 10 Formwork inspection fixture 11 Jig body 111 Legs 112 Holding part 113 Slit 114 First cylindrical part 115 Second cylindrical part 12 Clamping part 121 cores 1211 Knob 1212 Male thread 1213 Formwork top surface contact part 1214 Shaft (rotating shaft) 1215 Flange part 122 Preparation Nut 123 Formwork side abutment 13, 13A to 13C Belt member (interlocking part) 14 Compression spring 151 Pinion gear (interlocking part) 152 Rack gear (interlocking part) 20 Formwork (concrete formwork) 30 TS receiver (surveying tool) 40 Vial Level

Claims

1. A formwork inspection tool used when installing surveying tools on a concrete formwork, a jig body having a substantially cross shape in a plan view, the jig body having a holding portion at the center for positioning and holding the tip of the surveying tool and including four legs extending radially from the center; Four clamping parts are arranged around the holding part with respect to the jig body, and each of the clamping parts can clamp the concrete formwork by moving along the longitudinal direction of the leg part, A formwork inspection jig characterized in that each of the clamping parts is maintained at the same distance from the holding part when clamping the concrete formwork.

2. The formwork inspection tool according to claim 1, The clamping portion has a form side abutment portion that abuts against a side surface of the concrete formwork, A formwork inspection jig characterized in that the formwork side contact portion is freely rotatable around a rotation axis perpendicular to the longitudinal direction of the jig body, and the cross section perpendicular to the rotation axis is approximately L-shaped.

3. The formwork inspection jig according to claim 1 or 2, Each of the clamping parts is biased toward the holding part by a compression spring having the same natural length and spring constant, A formwork inspection jig characterized in that when the clamping portion clamps the concrete formwork, the spring forces of the compression springs become equal, thereby maintaining the same distance from the holding portion.

4. The formwork inspection jig according to claim 1 or 2, A linking unit is provided for linking and moving the other three clamping units when one of the clamping units is moved, A formwork inspection jig, characterized in that the interlocking portion interlocks the four clamping portions so that the distance between each clamping portion and the holding portion is maintained at the same distance.

5. The formwork inspection jig according to claim 4, The interlocking portion includes three belt members connecting any two of the four clamping portions, Each of the clamping portions is connected to at least one of the three belt members, A formwork inspection jig, characterized in that each of the belt members maintains a constant distance along a predetermined path between the two clamping portions to which it is connected.

6. The formwork inspection jig according to claim 4, A formwork inspection jig characterized in that the interlocking portion includes a pinion gear journaled on the jig body, and a rack gear arranged along the leg portion, connected to each of the clamping portions, and meshing with the pinion gear.

7. The formwork inspection jig according to claim 1 or 2, A formwork inspection jig, characterized in that each of the clamping parts is capable of adjusting its position relative to the jig body in a direction parallel to the rotation axis.

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