Detachable target jig for anchors

Abstract

To enable a detachable target jig for an anchor to be attached / detached to / from an anchor simply and quickly and to be reused, as a target used in photography and measurement processing for identifying a position of the anchor driven into a concrete structure.SOLUTION: A detachable target jig 1 for an anchor integrally comprises: jig body parts 1A, 1B each comprising a target mounting part 11 for detachably mounting a deflection-deformable target piece 2; and anchor clip parts 1A1, 1B1 that are detachably fitted to a shaft part 31 of an anchor 3 through elastic deformation. The target mounting part 11 has storage recess parts 1A2a, 1B2a formed by making some of the jig body parts 1A2, 1B2 thin, and flange parts 1A2b, 1B2b that narrow opening edges of the storage recess parts 1A2a, 1B2a. The deflected target piece 2 is detachably fitted into the target mounting part 11 by inserting it into the storage recess parts 1A2a, 1B2a through the inside of the flange parts 1A2b, 1B2b.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a target jig that can be attached to and detached from an anchor and is used for accurately measuring the position of an anchor disposed on a structure when constructing a concrete structure.

Background Art

[0002] When constructing concrete structures such as highways, railways, port facilities, bridges, and buildings, or performing construction for repair or seismic reinforcement work, anchors are used to attach other attachments to the main body concrete that serves as the base material. There are known pre-anchors that are attached to a predetermined position before placing the main body concrete and post-anchors that are drilled at a predetermined position and the anchor is driven in after the main body concrete has hardened. For example, when driving a post-anchor into a drilled hole in the main body concrete after it has hardened and fixing it with an epoxy resin or the like, and then attaching a bracket to the main body concrete via the post-anchor, conventionally, the tip positions of a number of anchors are traced onto a veneer board or the like for identification, the tip positions of the anchors are transferred from the veneer board to a film, and then the film is laid on the bracket and anchor holes are drilled at the tip positions of the anchors. The reason such work is necessary is that the anchors are not necessarily driven in perpendicular to the surface of the main body concrete, and even when the anchors are driven in at regular intervals, there is actually a variation in the intervals. However, this work usually took about 10 days, and shortening this period has been one of the factors contributing to the lengthening of the construction period.

[0003] In recent years, 3D digital cameras and computer programs such as CAD have come to be used to pinpoint the location of anchor holes, shortening the time required to drill anchor holes. For example, Patent Document 1 discloses a photometric mapping method in which measurement targets are attached to measurement points of an object to be measured, such as an anchor, photographic images including multiple measurement targets are taken, the coordinates of the measurement points are obtained based on the photographic images, geometric elements at the measurement points are obtained from the measurement targets in the photographic images, and all or part of the object to be measured is mapped so that it can be used with CAD based on the coordinates and geometric elements. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2015-75389 [Overview of the project] [Problems that the invention aims to solve]

[0005] Incidentally, in the photogrammetry mapping method described above, paragraph 0041 of the same document states, "Since the measurement target 200 is attached to the object to be measured, it is desirable that it be lightweight and small in size so that it does not peel off after being attached, and the back surface of the display surface (the surface on which the identification component 201 is displayed) may be equipped with an adhesive material such as a magnet." Thus, it is assumed that the target will be attached to a metal anchor with a magnet or the like. Other types of measurement targets are also commercially available, which have an adhesive sticker on the back of the display surface and are attached to the tip of an anchor, etc. These measurement targets require the work of attaching each one to the measurement point (the tip of the anchor, etc.) of the object to be measured, such as an anchor driven into the concrete structure (paragraph 0043 of the same document), and this attachment work currently takes a certain amount of time and effort. Furthermore, according to paragraph 0043 of the same document, it is necessary to prepare multiple types of measurement targets depending on the shape formed by multiple measurement points. For example, a measurement target for straight lines should be applied to measurement points that form straight lines, and a measurement target for arcs should be applied to measurement points that form arcs. In order to distinguish between them, it is also necessary to prepare in advance by applying colors or patterns to them.

[0006] This invention addresses these challenges and aims to shorten working time and, consequently, construction time by eliminating the need to attach targets to each anchor driven into the concrete structure. Instead, it provides a detachable target jig for anchors that is inexpensive and simple in structure, yet allows for accurate identification of the anchor's position by photograph, and can be reused repeatedly. [Means for solving the problem]

[0007] In other words, the detachable target jig for anchors according to the present invention is a target jig used to attach to and detach from an anchor protruding from a structural concrete structure, and comprises a jig body portion having a target mounting portion to which a flexible target piece used for identifying the position of the anchor by photographic and measurement processing can be detachably attached, and an anchor clip portion integrally provided in continuous with the jig body portion and detachably fitted onto the shaft portion of the anchor by elastic deformation, wherein the target mounting portion has a receiving recess formed by thinning a part of the jig body portion, and a flange portion on the surface of the jig body portion that closes part or all of the opening edge of the receiving recess, and the target piece is detachably fitted into the target mounting portion by inserting the flexible target piece into the receiving recess through the inside of the flange portion.

[0008] In the detachable target jig for anchors of the present invention (hereinafter sometimes simply referred to as "target jig"), the target piece can be pre-flexed and fitted into the target mounting portion of the jig body. Since the target piece is held in the receiving recess by the flange portion at the target mounting portion, the target piece will not fall off even when the target jig is attached to the anchor. With the target jig prepared in this way, the target can be accurately attached to the anchor, which is the object whose position is measured by photography, simply by fitting the anchor clip portion onto the shaft of the anchor protruding from the concrete structure. This significantly reduces the time and work required for target attachment, and greatly contributes to shortening the construction period and reducing costs of concrete structures. If the target jig of the present invention is sold with the target piece already fitted into the target mounting portion, the purchased target jig can be used directly at the construction site. Furthermore, after photography, the target jig can be removed by releasing the attachment of the anchor clip portion from the shaft of the anchor, and the target jig can be reused at another work site, thus reducing construction costs. Furthermore, by bending worn or deteriorated target pieces again to remove them from the target mounting section and fitting new target pieces into the target mounting section, the jig itself can be reused by simply replacing the target, which also contributes to cost reduction.

[0009] In the target jig of the present invention, the anchor clip portion is configured with a partially arc-shaped arm portion corresponding to the diameter of the anchor, and has inwardly protruding claw portions at both ends. This configuration allows for a simple design that maintains the fitted state of the anchor clip portion on the shaft portion of the anchor, while also enabling quick attachment and detachment. Since anchors with shaft portions of multiple diameters are sometimes used at construction sites, it is sufficient to prepare multiple types of target jigs, each with an arm portion that corresponds to a standard number of different shaft portion diameters for anchors.

[0010] Furthermore, if the target jig of the present invention is intended to be attached exclusively to the tip of an anchor, a connecting portion is formed near the front end of the anchor clip portion to which the jig body is positioned, and the jig body is configured so that the center of the target piece fitted into the target attachment portion coincides with the axis of the anchor.

[0011] On the other hand, if the target jig of the present invention is intended to be used exclusively for attachment to the base of an anchor protruding from the surface of the structural concrete, a connecting portion is formed around the anchor clip portion for arranging the jig body portion, and multiple target attachment portions are formed on the jig body portion such that the centers of the target pieces fitted into the target attachment portions are arranged substantially evenly.

[0012] Furthermore, by making the target mounting section a common size and configuration, it becomes possible to use only one type of target piece that fits into the target mounting section, thus further enhancing the cost reduction effect through the sharing of components. [Effects of the Invention]

[0013] According to the target jig of the present invention, if the target piece is pre-fitted into the target mounting portion of the jig body, the target can be easily attached to the anchor simply by fitting the anchor clip portion onto the anchor shaft. This allows for accurate photography of the target piece, reduces the time and effort required for target attachment, and shortens the duration of concrete construction work. Furthermore, once the photography for anchor position identification is complete, the target jig can be removed from the anchor and reused at the next work site. If the target piece is worn or deteriorated, only the target piece can be replaced, thus contributing to a reduction in construction costs. [Brief explanation of the drawing]

[0014] [Figure 1] A photographic diagram showing a model of a construction site where a target jig according to one embodiment of the present invention is used. [Figure 2]A side view showing the target jig according to the same embodiment attached to an anchor. [Figure 3] A diagram showing photographs of the actual two types of target jigs used in the same embodiment. [Figure 4] A front view showing the target piece and target jig in the same embodiment attached to the anchor. [Figure 5] External view of the target jig for the tip (excluding the target piece) in the same embodiment. [Figure 6] External view of the target jig for the root portion (excluding the target piece) in the same embodiment. [Figure 7] A schematic diagram showing how the target piece is attached to and detached from the target mounting part in the same embodiment. [Figure 8] A front view showing the target jig according to the same embodiment attached to an anchor. [Modes for carrying out the invention]

[0015] Hereinafter, an anchor detachable target jig 1 (hereinafter simply referred to as "target jig") according to one embodiment of the present invention will be described with reference to the drawings. As shown in Figure 2, the target jig 1 of this embodiment has two types: a target jig 1A for the tip portion that is attached to the tip portion 32 of the shaft portion 31 of the anchor (anchor bolt 3 in this embodiment), and a target jig 1B for the base portion that is attached to the base portion 33 of the shaft portion 31 of the anchor bolt 3 that protrudes from the surface 41 of the structural concrete 4. One target jig 1A for the tip portion and one target jig 1B for the base portion are attached to each anchor bolt 3. In this embodiment, a common target piece 2 is attached to the target mounting portion 11 of the target jig 1, and one target piece 2 is attached to the target jig 1A for the tip portion, and three target pieces 2 are attached to the target jig 1B for the base portion.

[0016] Figure 1 is a photograph of a model of a construction site for a concrete structure. In this figure, the model of the structural concrete 4 was created for testing the target jig 1 of this embodiment, so anchor bolts 3 are pre-embedded in the structural concrete 4 like pre-installed anchors, and the target jig 1B for the base is attached to the shaft portion 31 of the anchor bolts 3 in front of the surface 41 of the structural concrete 4. However, in an actual construction site, the structural concrete 4 will extend to the position where the grid-like reinforcing bars 42 assembled in front of the surface of the structural concrete 4 are embedded in concrete, so the target jig 1B for the base will be positioned near the surface 1 of the structural concrete 4, as shown in Figure 2. In this embodiment, after the concrete structure 4 has hardened, numerous anchor bolts 3 are driven in at predetermined intervals as post-installation anchors for attaching brackets (not shown). To accurately identify the position of each anchor bolt 3 and drill anchor holes in the brackets, the anchor bolts 3, which are the objects to be measured, are photographed with a 3D digital camera. The photographic data is then converted into coordinates, and the coordinate data is input into a CAD program to determine the position of the anchor holes relative to the brackets. For this purpose, each anchor bolt 3 is fitted with a target jig 1 of this embodiment (a target jig 1A for the tip and a target jig 1B for the base) with a target piece 2 attached, and the position of the target piece 2 in the photographic data is used for coordinate conversion. Figure 2 shows a side view of one anchor bolt 3 with the target jig 1 (a target jig 1A for the tip and a target jig 1B for the base) attached, and Figures 3 and 4 show actual photographs and front views of the two types of target jig 1.

[0017] The tip target jig 1A is integrally formed of a synthetic resin material. As shown in FIG. 5, it is composed of an anchor clip portion 1A1, a jig main body portion 1A2, and a connecting portion 1A3 that connects the anchor clip portion 1A1 and the jig main body portion 1A2. The anchor clip portion 1A1 is composed of an arm portion 1A1a formed in a thin-walled partial cylindrical shape and claw portions 1A1b formed at both ends of the arm portion 1A1a. The inner diameter of the arm portion 1A1a is set to be the same as the outer diameter of the shaft portion 31 of the anchor bolt 3. When attached to the tip portion 32 of the shaft portion 31, it fits in a range slightly larger than the radius of the shaft portion 31, and the pair of claw portions 1A1b prevent it from coming off. That is, the distance between the claw portions 1A1b is less than 180° around the center of the arm portion 1A1a. The claw portions 1A1b are protruding portions with acute angles formed to protrude inward at both ends of the arm portion 1A1a. The arm portion 1A1a is elastically deformed and expanded and then fitted to the tip portion 32 of the shaft portion 31 of the anchor bolt 3. When the arm portion 1A1a elastically returns, the pair of claw portions 1A1b abut against the outer periphery of the shaft portion 31 and catch on it.

[0018] The connecting portion 1A3 is a hanging piece that extends from the front end of the anchor clip portion 1A1 toward the center direction of the arm portion 1A1a, and the jig main body portion 1A2 is continuously formed at the lower end of this connecting portion 1A3.

[0019] The jig main body portion 1A2 is a disk-shaped portion that is continuous with the connecting portion 1A3, and its center coincides with the central axis of the arm portion 1A1a in the anchor clip portion 1A1. Further, in order to fit the target piece 2, a housing recess 1A2a is formed in the central portion of the jig main body portion 1A2 with a thinner front side and a circular depression. The center of the housing recess 1A2a coincides with the center of the jig main body portion 1A2. Further, on the front surface of the jig main body portion 1A2, a pair of flange portions 1A2b are formed so as to partially block the left and right of the opening peripheral edge of the housing recess 1A2a. The combination of the housing recess 1A2a and the pair of flange portions 1A2b constitutes the target mounting portion 11.

[0020] The base target jig 1B is also integrally formed from a synthetic resin material, and as shown in Figure 6, it consists of an anchor clip portion 1B1, a jig body portion 1B2, and a connecting portion 1B3 that connects the anchor clip portion 1B1 and the jig body portion 1B2. The structure of the anchor clip portion 1B1 is the same as that of the anchor clip portion 1A1 of the tip target jig 1A, and it has an arm portion 1B1a and a claw portion 1B1b. The connecting portion 1B3 is an upright piece that extends from the rear end of the anchor clip portion 1B1 toward the opposite center of the arm portion 1B1a, and the jig body portion 1B2 is continuously formed at the upper end of this connecting portion 1B3.

[0021] The jig body portion 1B2 is a partially arc-shaped plate with a portion of its lower end missing, and its center aligns with the central axis of the arm portion 1B1a of the anchor clip portion 1B1. At the upper end and both lower ends of the jig body portion 1B2, sets of receiving recesses 1B2a and a pair of left and right flange portions 1B2b are formed, similar to the jig body portion 1A2 of the target jig 1A for the tip portion, allowing the target piece 2 to be fitted into each receiving recess 1B2a. The three sets of receiving recesses 1B2a and the pair of left and right flange portions 1B2b are spaced approximately 120° apart with respect to the center of the jig body portion 1B2. The jig body portion 1B2 consists of a total of three target mounting portions 11 formed by these sets of receiving recesses 1B2a and the pair of flange portions 1B2b.

[0022] As shown in Figure 4, the target piece 2 is made of a flexible, deformable circular sheet made of synthetic resin or thick paper. The surface is black, with a small black center point 2a in the middle and a white circle 2b surrounding this center point 2a. Furthermore, four rectangular white marks 2c are drawn along the periphery at approximately 90° intervals. When attaching this target piece 2 to each target mounting part 11 of the target jig 1, as shown in Figure 7, it is brought close to the tip target jig 1A and the base target jig 1B, bent inward in the diametrical direction, passed through the left and right pairs of flanges 1A2b and 1B2b, and then inserted into the respective receiving recesses 1A2a and 1B2a. The elastic restoring force of the target jig 2 itself causes it to expand into a disc shape, allowing it to be fitted and attached to the respective receiving recesses 1A2a and 1B2a. To remove the target piece 2 from the respective receiving recesses 1A2a and 1B2a, the reverse procedure is followed.

[0023] In this way, the target jig 1A for the tip and the target jig 1B for the base are prepared with the target pieces 2 fitted into the respective receiving recesses 1A2a and 1B2a. As shown in Figures 1 and 2, anchor bolts 3 are embedded in the drilled positions on the surface 41 of the hardened structural concrete 4 and fixed with epoxy resin or the like, and the target jig 1 is attached to each anchor bolt 3. Specifically, for the target jig 1A for the tip, the arm portion 1A1a of the anchor clip portion 1A1 is fitted onto the tip portion 32 of the shaft portion 31 of the anchor bolt 3 by expanding it with elastic deformation, the claw portion 1A1b is hooked onto the shaft portion 31, and the back surface of the jig body portion 1A2 is positioned in contact with or near the tip of the shaft portion 31. The base target jig 1B is fitted onto the base portion 33 of the shaft portion 31 of the anchor bolt 3 by elastically deforming the arm portion 1B1a of the anchor clip portion 1B1, and hooking the claw portion 1B1b onto the shaft portion 31, so that the back surface of the jig body portion 1B2 is in contact with or near the surface 41 of the structural concrete 4. When this mounting state of the target jig 1 on the anchor bolt 3 is viewed from the front, as shown in Figure 8, the three target pieces 2 of the base target jig 1B are arranged at equal intervals on a circle that is approximately equidistant from the center point 2a of the target piece 2 of the tip target jig 1A. This front view is photographed with a 3D digital camera capable of acquiring depth information, and the positional relationship of the four target pieces 2 is determined by converting the photographic data into coordinates, including the inclination of the anchor bolt 3 with respect to the surface 41 of the structural concrete 4. By inputting the coordinate data into a CAD program, the position of the anchor hole relative to the bracket is determined. Then, based on the identified anchor hole location information, anchor holes are formed in the bracket. Once the shooting is complete, the target jig 1B for the tip and the target fixture 1B for the base can be removed from the anchor bolt 3 and reused at the next shooting location.In actual testing using the target jig 1 of this embodiment, it was found that the entire process, from attaching the target jig 1 to the anchor bolt 3, to taking photographs, taking measurements, and finally drilling anchor holes in the bracket, could be completed in two days. This clearly demonstrates that it can significantly contribute to shortening the construction period of concrete structures.

[0024] As described above, the target jig 1 of this embodiment is used together with the target piece 2, and by elastically deforming the anchor clip portions 1A1 and 1B1, it can be detachably fitted onto the shaft portion 31 of the anchor bolt 3 driven into the structural concrete. The target piece 2 is detachably fitted into the target mounting portion 11 provided on the jig body portions 1A2 and 1B2. This simplifies and speeds up the work of attaching the target (target piece 2) to the anchor bolt 3, and can greatly contribute to shortening the construction period and reducing costs of concrete structures. In particular, the target mounting section 11 is composed of thin-walled receiving recesses 1A2a and 1B2a formed in the jig body sections 1A2 and 1B2, and a pair of flange sections 1A2b and 1B2b that partially close the openings. The bent target piece 2 is inserted into the receiving recesses 1A2a and 1B2a from the inside of the flange sections 1A2b and 1B2b and fitted into place. This configuration makes it easy to attach and detach the target piece 2, and there is no risk of the target piece 2 falling off the target mounting section 11 during use. Furthermore, if the target piece 2 deteriorates or wears out, only the target piece 2 needs to be replaced while reusing the target jig 1, which contributes to cost reduction.

[0025] In particular, the anchor clips 1A1 and 1B1 are configured with arm portions 1A1a and 1B1a that form a partial arc shape corresponding to the diameter of the anchor bolt 3, and each end portion is equipped with a pair of claw portions 1A1b and 1B1b that protrude inward. This simple configuration allows for quick attachment and detachment of the anchor clips 1A1 and 1B1 to the shaft portion 31 of the anchor bolt 3, and ensures that the fitted state is maintained.

[0026] Furthermore, in this embodiment, the target jig 1 is provided in two types: a target jig 1A for the tip portion 32 of the anchor bolt 3 and a target jig 1B for the base portion 33. The anchor clip portions 1A1 and 1B1 and the structure of all target mounting portions 11 are common to both, thereby simplifying the design and reducing costs. In the target jig 1A for the tip portion, a connecting portion 1A3 is formed near the front end of the anchor clip portion 1A1, and the center of the target piece 2 fitted into the target mounting portion 11 is configured to coincide with the axis of the anchor bolt 3. In the target jig 1B for the base portion, a connecting portion 1B3 is formed around the anchor clip portion 1B1, and the centers of the target pieces 2 fitted into the three target mounting portions 11 are arranged approximately evenly. Due to this configuration, when the anchor bolt 3 is photographed with a 3D digital camera, a total of four target pieces 2 are captured from the front: one target piece 2 at the tip 32 and three target pieces 2 at the base 33. This allows for accurate coordinate mapping of the inclination of the anchor bolt 3 relative to the surface 41 of the structural concrete 4, enabling precise drilling of anchor holes in the bracket.

[0027] As described above, one embodiment of the present invention has been explained, but the present invention is not limited to the configuration of the above embodiment. In this embodiment, two types of target jigs 1 (1A, 1B) for the tip and base of one type of anchor bolt 3 have been described, but at construction sites, anchor bolts 3 with shafts of multiple thicknesses are used, and anchors other than anchor bolts 3 exist, so multiple types of target jigs having arms that correspond to standard anchors can be prepared. Furthermore, the target jig 1 of the present invention can be adapted not only to post-installed anchors but also to pre-installed anchors.

[0028] Furthermore, regarding the specific configuration of each part constituting the target jig 1 (1A, 1B), i.e., shape, structure, material, etc., various configurations other than those of the above embodiments can be adopted, as long as they are in line with the spirit of the present invention. [Explanation of Symbols]

[0029] 1. Detachable target fixture for anchors (target fixture) 11…Target mounting section 1A…Target jig for the tip 1B...Target jig for the root area 1A1, 1B1... Anchor clip section 1A1a, 1B1a...Arm 1A1b, 1B1b...Claw part 1A2, 1B2... Jig body 1A2a, 1B2a... Accommodation recesses 1A2b, 1B2b...Tsubabe 1A3, 1B3... Connection part 2…Target piece 3… Anchor (anchor bolt) 31... Shaft 32...Tip 33... Root part 4…Structural concrete 41…Surface

Claims

1. A target jig used for attaching to and detaching from anchors protruding from the structural concrete, The jig body includes a target mounting portion for detachably attaching a flexible target piece used to identify the position of the anchor by photographic and measurement processing, and an anchor clip portion that is integrally provided with the jig body and is detachably fitted onto the shaft portion of the anchor by elastic deformation. A detachable target jig for anchors is characterized in that the target mounting portion has a receiving recess formed by thinning a part of the jig body, and a flange portion on the surface of the jig body that closes part or all of the opening edge formed by the receiving recess, and the target piece is detachably fitted into the target mounting portion by inserting the bent target piece into the receiving recess through the inside of the flange portion.

2. The anchor detachable target jig according to claim 1, wherein the anchor clip portion is configured to have inwardly protruding claw portions at both ends of an arm portion that is partially arc-shaped corresponding to the diameter of the anchor.

3. A detachable target jig for an anchor according to claim 1 or 2, wherein a connecting portion is formed near the front end of the anchor clip portion for positioning the jig body portion, and the jig body portion is configured such that the center of the target piece fitted into the target mounting portion coincides with the axis of the anchor.

4. A detachable target jig for an anchor according to claim 1 or 2, wherein a connecting portion is formed around the anchor clip portion for positioning the jig body portion, and a plurality of target mounting portions are formed on the jig body portion such that the centers of the target pieces fitted into the target mounting portion are arranged substantially evenly.

5. The detachable target jig for anchors according to claim 1, wherein the target mounting portion has a common size and configuration.

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