Detachable target jig for anchor

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 to accurately measure the position of an anchor placed in a structure when constructing the concrete structure. [Background technology]

[0002] When constructing concrete structures such as highways, railways, port facilities, bridges, and buildings, or when carrying out repair or seismic reinforcement work, anchors are used to attach other attachments to the base concrete structure. Known types of anchors include pre-installed anchors that are installed in predetermined positions before the concrete structure is poured, and post-installed anchors that are drilled and installed in predetermined positions after the concrete structure has hardened. For example, when post-installed anchors are installed in drilled holes after the concrete structure has hardened and then fixed with epoxy resin or the like, and then brackets are attached to the concrete structure via the post-installed anchors, the conventional procedure involves tracing the tip positions of the numerous anchors onto plywood or the like, transferring the anchor tip positions from the plywood to a film, laying the film on the bracket, and drilling anchor holes at the anchor tip positions. The reason this work is necessary is that anchors are not necessarily driven perpendicular to the surface of the concrete structure, and even if anchors are driven in at regular intervals, there is actually variation in the spacing.This work normally took about 10 days, so shortening this period was one of the factors that lengthened the construction period.

[0003] In recent years, the use of 3D digital cameras and computer programs such as CAD has come to be used to identify anchor hole positions, shortening the time it takes to drill anchor holes.For example, Patent Document 1 discloses a photomeasurement and mapping method in which measurement targets are affixed to measurement points on an object to be measured, such as an anchor, a photographic image containing multiple measurement targets is taken, coordinates of the measurement points are obtained based on the photographic image, graphic elements at the measurement points are obtained from the measurement targets in the photographic image, and all or part of the object to be measured is mapped based on the coordinates and graphic elements so that it can be used in CAD. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2015-75389 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in the above-mentioned photometric mapping method, paragraph 0041 of the same document states, "Since the measurement target 200 is affixed to the measurement object, it is desirable that it be lightweight and small so that it will not fall off after affixing, and an adhesive such as a magnet may be provided on the backside of the display surface (the surface on which the identification point 201 is displayed)." As such, it is assumed that the measurement target will be affixed to a metal anchor with a magnet or the like. Other measurement targets are also commercially available, such as those with an adhesive sticker on the backside of the display surface that can be affixed to the tip of an anchor. These measurement targets require the work of affixing them one by one to the measurement points (e.g., the tip of an anchor) of the measurement object, such as anchors driven into the concrete structure (paragraph 0043 of the same document), and this affixing 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, such as applying a measurement target for a straight line to measurement points that form a straight line and applying a measurement target for an arc to measurement points that form an arc, and it is also necessary to make advance preparations such as adding colors or patterns to them in order to distinguish them.

[0006] The present invention has been made with an eye on such problems, and provides a detachable target jig for anchors that is inexpensive and simple in construction yet can accurately identify the position of the anchor by photographing it, and can be reused repeatedly, in order to eliminate the need to attach targets one by one to anchors driven into the concrete structure, and to shorten work time and ultimately the construction period by attaching a jig that already holds the target to the anchor. [Means for solving the problem]

[0007] In other words, the detachable target jig for anchors according to the present invention is a target jig that is detachably attached to an anchor that protrudes from a concrete structure, and comprises a jig main body portion equipped with a target mounting portion for detachably attaching a flexible target piece that is used to identify the position of the anchor through photography and measurement processing, and an anchor clip portion that is formed continuously and integrally with the jig main body portion and is detachably fitted to the shank of the anchor by elastic deformation.The target mounting portion is configured to have a accommodating recess formed by thinning a portion of the jig main body portion, and a flange portion that closes part or all of the opening edge of the accommodating recess on the surface of the jig main body portion, and is configured so that the target piece can be detachably fitted to the target mounting portion by inserting the deflected target piece through the inside of the flange portion into the accommodating recess.

[0008] In this type of detachable target jig for anchors (hereinafter sometimes simply referred to as the "target jig") of the present invention, the target pieces can be pre-flexed and fitted into the target mounting portion of the jig body. Because the target pieces are held in the accommodation recess by the flange portion of the target mounting portion, the target pieces will not fall off even when the target jig is attached to the anchor and in use. With this prepared target jig, the target can be accurately attached to the anchor, the position of which is measured by photography, simply by fitting the anchor clip portion to the shank of the anchor protruding from the concrete structure. This significantly reduces the time and effort required for target installation, significantly contributing to shortening the construction period and reducing costs for concrete structures. If the target jig of the present invention is sold with the target pieces fitted into the target mounting portion, the purchased target jig can be used at the construction site as is. Furthermore, after photography, the target jig can be reused at another work site by detaching the anchor clip portion from the shank of the anchor, thereby reducing construction costs. Furthermore, if the worn or deteriorated target piece is bent again and removed from the target mounting portion, and a new target piece is fitted into the target mounting portion, 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 to have claws that protrude inward at both ends of the arms that are partially arc-shaped corresponding to the diameter of the anchor, thereby enabling the anchor clip portion to be maintained in a fitted state with respect to the shank of the anchor with a simple configuration, while also allowing for quick attachment and detachment.Since anchors with shanks of multiple different thicknesses are sometimes used at construction sites, it is sufficient to prepare multiple types of target jigs with arms that correspond to anchors with standard shanks of multiple different thicknesses.

[0010] Furthermore, when the target jig of the present invention is intended exclusively for attachment to the tip of an anchor, a connection portion for positioning the jig main body portion can be formed near the front end of the anchor clip portion, and the jig main body portion can be 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 exclusively for attachment to the base portion of an anchor protruding from the surface of the concrete body, a connection portion for positioning the jig main body portion around the anchor clip portion can be formed, and multiple target attachment portions can be formed on the jig main body portion so that the centers of the target pieces fitted into the target attachment portions are approximately evenly positioned.

[0012] Furthermore, by making the target mounting parts a common size and configuration, the target pieces that are fitted into the target mounting parts can be of a single type, making the cost reduction effect even more effective by sharing components. [Effects of the Invention]

[0013] According to the target jig of the present invention, if the target pieces are prepared in advance by fitting them into the target mounting portion of the jig body, the target can be easily attached to the anchor by simply fitting the anchor clip portion to the shank of the anchor, and the target pieces can be accurately photographed, reducing the time and effort involved in target attachment work and shortening the concrete construction period. Furthermore, once the photographing to identify the anchor's position is completed, the target jig can be removed from the anchor and reused at the next work site, and if the target pieces become worn or deteriorated, they can be replaced alone, which also contributes to reducing construction costs. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a photographic representation of a model of a construction site where a target jig according to an embodiment of the present invention is used. [Figure 2]FIG. 10 is a side view showing a state in which the target jig according to the embodiment is attached to an anchor. [Figure 3] 3A and 3B are photographs showing two types of actual target jigs according to the embodiment. [Figure 4] FIG. 2 is a front view showing the target piece and the target jig attached to the anchor in the embodiment. [Figure 5] FIG. 2 is an external view of a tip portion target jig (excluding target pieces) in this embodiment. [Figure 6] FIG. 2 is an external view of a base portion target jig (excluding target pieces) in the same embodiment. [Figure 7] 5A and 5B are schematic diagrams showing how a target piece is attached to and detached from a target attachment portion in the embodiment. [Figure 8] FIG. 10 is a front view showing a state in which the target jig according to the embodiment is attached to an anchor. DETAILED DESCRIPTION OF THE INVENTION

[0015] A detachable target jig 1 for an anchor (hereinafter simply referred to as "target jig") according to one embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 2, there are two types of target jigs 1 in this embodiment: a tip target jig 1A attached to a tip portion 32 of a shank 31 of an anchor (an anchor bolt 3 in this embodiment), and a base target jig 1B attached to a base portion 33 of the shank 31 of the anchor bolt 3 protruding from the surface 41 of the concrete structure 4. One tip target jig 1A and one base target jig 1B are attached to one 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 tip target jig 1A, and three target pieces 2 are attached to the base target jig 1B.

[0016] 1 is a photograph of a model of a construction site where a concrete structure is being constructed. Since the figure shows a model of a concrete body 4 created for testing the target jig 1 of this embodiment, an anchor bolt 3 is embedded in the concrete body 4 in advance like a pre-attached anchor, and the base target jig 1B is shown attached to the shank 31 of the anchor bolt 3 in front of the surface 41 of the concrete body 4. However, at an actual construction site, the concrete body 4 will extend up to a position where lattice-shaped reinforcing bars 42 arranged in front of the surface of the concrete body 4 will be buried in concrete, so the base target jig 1B will be positioned near the surface 1 of the concrete body 4, as shown in FIG. In this embodiment, multiple anchor bolts 3 are driven into the hardened concrete structure 4 at predetermined intervals as post-installation anchors to attach brackets (not shown). To accurately identify the position of each anchor bolt 3 and drill anchor holes in the bracket, the anchor bolts 3, which are the measurement targets, are photographed with a 3D digital camera. The photographic data is converted into coordinates, and the coordinate data is entered into a CAD program to identify the anchor hole positions relative to the bracket. To achieve this, a target jig 1 (tip target jig 1A and base target jig 1B) with target pieces 2 attached is attached to each anchor bolt 3, and the positions of the target pieces 2 in the photographic data are used for coordinate conversion. Figure 2 shows a side view of a single anchor bolt 3 with the target jig 1 (tip target jig 1A and base target jig 1B) attached, and Figures 3 and 4 show actual photographs and front views of two types of target jigs 1.

[0017] The tip target jig 1A is integrally formed from a synthetic resin material and, as shown in FIG. 5, comprises an anchor clip portion 1A1, a jig body portion 1A2, and a connecting portion 1A3 connecting the anchor clip portion 1A1 and the jig body portion 1A2. The anchor clip portion 1A1 comprises a thin-walled arm portion 1A1a formed in a partially 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 the same diameter as the outer diameter of the shank portion 31 of the anchor bolt 3. When attached to the tip portion 32 of the shank portion 31, it fits over a range slightly larger than the radius of the shank portion 31, and the pair of claw portions 1A1b prevents it from coming loose. In other words, the claw portions 1A1b are spaced apart by a range less than 180° around the center of the arm portion 1A1a. The claws 1A1b are protruding portions at acute angles formed on both ends of the arm portion 1A1a so as to protrude inward. The arm portions 1A1a are elastically deformed and spread apart while being fitted onto the tip end 32 of the shank 31 of the anchor bolt 3, and when the arm portions 1A1a elastically return to their original position, the pair of claws 1A1b come into contact with and hook onto the outer periphery of the shank 31.

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

[0019] The jig body 1A2 is a disk-shaped portion connected to the connecting portion 1A3, and its center is aligned with the central axis of the arm portion 1A1a of the anchor clip portion 1A1. Furthermore, a mounting recess 1A2a is formed in the center of the jig body 1A2, with a thinner wall than the other portions and a circular recess on the front side to fit the target piece 2. The center of the mounting recess 1A2a is aligned with the center of the jig body 1A2. Furthermore, a pair of flanges 1A2b are formed on the front of the jig body 1A2 so as to partially close the left and right edges of the opening of the mounting recess 1A2a. The combination of the mounting recess 1A2a and the pair of flanges 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, is composed 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 anchor clip portion 1B1 has the same configuration as the anchor clip portion 1A1 of the tip target jig 1A, and is equipped with 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 anti-center direction of the arm portion 1B1a, and the jig body portion 1B2 is formed continuously with the upper end of this connecting portion 1B3.

[0021] The jig body 1B2 is a partially arcuate plate with a portion missing from its lower end, and its center is aligned with the central axis of the arm 1B1a of the anchor clip 1B1. Similar to the jig body 1A2 of the tip target jig 1A, three locations on the jig body 1B2—its upper and lower ends—are provided with a set of mounting recesses 1B2a and a pair of left and right flanges 1B2b, allowing a target piece 2 to be fitted into each mounting recess 1B2a. The three mounting recesses 1B2a and pairs of left and right flanges 1B2b are spaced apart at approximately 120° intervals from the center of the jig body 1B2. The jig body 1B2 includes three target mounting sections 11, each consisting of a mounting recess 1B2a and a pair of flanges 1B2b.

[0022] As shown in FIG. 4, the target piece 2 is made of a flexible circular sheet of synthetic resin, thick paper, or the like. Its surface is black, with a small black center point 2a and a white circle 2b surrounding the center point 2a. Four rectangular white marks 2c are also drawn at approximately 90° intervals along the periphery. To attach the target piece 2 to each target mounting portion 11 of the target jig 1, as shown in FIG. 7, the target piece 2 is brought close to the tip target jig 1A and the base target jig 1B, and bent radially inward to pass through the pair of left and right flanges 1A2b, 1B2b. The target piece 2 is then inserted into each of the mounting recesses 1A2a, 1B2a, where it is expanded into a disk shape by the elastic restoring force of the target jig 2 itself, allowing it to be fitted into the mounting recesses 1A2a, 1B2a. To remove the target piece 2 from each mounting recess 1A2a, 1B2a, the reverse procedure is followed.

[0023] In this way, the tip portion target jig 1A and the base portion target jig 1B are prepared with the target pieces 2 fitted into the respective accommodation recesses 1A2a, 1B2a. As shown in Figures 1 and 2, anchor bolts 3 are embedded in drilled positions on the surface 41 of hardened concrete body 4 and fixed with epoxy resin or the like, and the target jigs 1 are attached to each anchor bolt 3. Specifically, the tip portion target jig 1A is fitted onto the tip portion 32 of the shank 31 of the anchor bolt 3 while the arm portions 1A1a of the anchor clip portion 1A1 are elastically deformed to spread, and the claw portions 1A1b are hooked onto the shank 31, and the back surface of the jig body portion 1A2 is abutted against or positioned in the vicinity of the tip of the shank 31. The base target jig 1B is fitted to the base 33 of the shank 31 of the anchor bolt 3 by elastically expanding the arms 1B1a of the anchor clip portion 1B1, hooking the claws 1B1b onto the shank 31, and positioning the back surface of the jig body 1B2 in contact with or near the surface 41 of the concrete structure 4. When this target jig 1 is attached to the anchor bolt 3 from the front, as shown in Figure 8, the three target pieces 2 of the base target jig 1B are equally spaced on a circle 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 photographic data is converted into coordinates to determine the positional relationship of the four target pieces 2, including the inclination of the anchor bolt 3 with respect to the surface 41 of the concrete structure 4. The coordinate data is then input into a CAD program to determine the position of the anchor hole relative to the bracket. Then, anchor holes are formed in the bracket based on the identified anchor hole position information. Once the imaging is complete, the tip target jig 1B and base target jig 1B can be removed from the anchor bolt 3 and reused at the next imaging location.When a test was actually conducted using the target jig 1 of this embodiment, the entire process from attaching the target jig 1 to the anchor bolt 3, through photographing and measurement, to drilling anchor holes in the brackets could be completed in two days, making it clear that this method can greatly contribute to shortening the construction period for concrete structures.

[0024] As described above, the target jig 1 of this embodiment is used together with the target piece 2, and can be detachably fitted onto the shank 31 of the anchor bolt 3 driven into the concrete body by elastically deforming the anchor clip portions 1A1, 1B1, and the target piece 2 is detachably fitted into the target mounting portions 11 provided on the jig main body portions 1A2, 1B2. This simplifies and speeds up the work of mounting the target (target piece 2) onto the anchor bolt 3, and can greatly contribute to shortening the construction period and reducing costs of concrete structures. In particular, the target mounting portion 11 is composed of thin-walled accommodating recesses 1A2a, 1B2a formed in the jig main body portions 1A2, 1B2 and a pair of flange portions 1A2b, 1B2b that partially close the openings thereof, and the deflected target pieces 2 are inserted and fitted into the accommodating recesses 1A2a, 1B2a from the inside of the flange portions 1A2b, 1B2b, so that the target pieces 2 are easily attached and detached, and there is no risk of the target pieces 2 falling off from the target mounting portion 11 during use. Furthermore, if the target pieces 2 deteriorate or wear out, the target jig 1 can be reused and only the target pieces 2 can be replaced, which can also contribute to cost reduction.

[0025] In particular, anchor clip parts 1A1, 1B1 are configured with pairs of claw parts 1A1b, 1B1b that protrude inward from both ends of arm parts 1A1a, 1B1a that form a partial arc shape corresponding to the diameter of anchor bolt 3, so that with a simple configuration, it is possible to quickly attach and detach anchor clip parts 1A1, 1B1 to and from shank 31 of anchor bolt 3 and to maintain the fitted state.

[0026] In this embodiment, the target jig 1 is made up of two types: a tip target jig 1A dedicated to attachment to the tip 32 of the anchor bolt 3, and a base target jig 1B dedicated to attachment to the base 33. The anchor clip portions 1A1, 1B1 of both types and all of the target mounting portions 11 have a common structure, thereby simplifying the design and reducing costs. In the tip target jig 1A, a connecting portion 1A3 for arranging the jig main body 1A2 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 base target jig 1B, a connecting portion 1B3 for arranging the jig main body 1B2 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. Because of this configuration, when the anchor bolt 3 is photographed with a 3D digital camera, a total of four target pieces 2, one at the tip 32 and three at the base 33, are photographed from the front, which makes it possible to accurately coordinate the inclination of the anchor bolt 3 relative to the surface 41 of the concrete body 4 and accurately drill an anchor hole in the bracket.

[0027] As described above, one embodiment of the present invention has been described, 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) have been described, one for the tip portion and one for the base portion, which are applied to one type of anchor bolt 3 as an anchor. However, at a construction site, anchor bolts 3 having shanks of multiple thicknesses are used, and anchors other than anchor bolt 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 is not limited to post-installation anchors, and can also be used for pre-installation anchors.

[0028] Furthermore, the specific configuration of each part of the target jig 1 (1A, 1B), that is, the shape, structure, material, etc., can be variously different from the above embodiment as long as it is within the spirit of the present invention. [Explanation of symbols]

[0029] 1...Detachable target jig for anchor (target jig) 11...Target mounting part 1A...Tip target jig 1B...Target jig for base part 1A1, 1B1...Anchor clip part 1A1a, 1B1a...Arm part 1A1b, 1B1b...Claw part 1A2, 1B2...Jig body 1A2a, 1B2a...accommodating recess 1A2b, 1B2b...Tsubabe 1A3, 1B3...connection 2...Target fragment 3...Anchor (anchor bolt) 31...Shaft 32...Tip 33...Base 4...Concrete structure 41…Surface

Claims

1. A target jig that is detachably attached to an anchor protruding from a concrete structure, the jig body includes a target mounting portion for detachably mounting a flexible target piece used to identify the position of the anchor by photography and measurement processing; and an anchor clip portion that is provided integrally with and continuous to the jig body and is detachably fitted to the shank of the anchor by elastic deformation, A detachable target jig for anchors, characterized in that the target mounting portion has a storage recess formed by thinning a portion of the jig body, and a flange portion on the surface of the jig body that closes part or all of the opening edge of the storage recess, and the target piece in a deflected state is inserted into the storage recess through the inside of the flange, thereby detachably fitting the target piece into the target mounting portion.

2. 2. A detachable target jig for anchors as described in claim 1, wherein the anchor clip portion is configured with claw portions that protrude inward at both ends of an arm portion that is partially arc-shaped and corresponds to the diameter of the anchor.

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

4. 3. The detachable target jig for anchors according to claim 1, wherein a connection portion for positioning the jig main body portion is formed around the anchor clip portion, and a plurality of target mounting portions are formed on the jig main body portion so that the centers of the target pieces fitted into the target mounting portions are approximately evenly positioned.

5. 2. A detachable target jig for an anchor according to claim 1, wherein the target mounting portions have a common size and configuration.

Images