Bracket installation method and bracket installation system

Abstract

To provide a bracket installation method and a bracket installation system capable of grasping the position and shape of an anchor bolt even in a place where it is difficult to photograph images from a plurality of places or in a dark place.SOLUTION: A bracket installation method includes: a design drawing creation step; a 3D scanning step of performing three-dimensional measurement of an existing structural object including anchor bolts provided in the existing structural object; a drawing creation step of creating a bolt hole drawing reflecting positions and shapes of bolt holes of the anchor bolts based on the result of the three-dimensional measurement; a manufacturing drawing preparing step of preparing a bracket manufacturing drawing in which the position and shape of a bolt hole of an actual anchor bolt are displayed based on a bracket design drawing and a bolt hole drawing; a bracket preparing step of preparing a bracket based on the bracket manufacturing drawing; and a bracket mounting step of mounting the prepared bracket to an existing structure by using the anchor bolt.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a bracket installation method and a bracket installation system for installing brackets to secure earthquake-resistant reinforcement devices that are attached to existing structures in civil engineering and construction to reinforce the earthquake resistance of the existing structures. [Background technology]

[0002] As an example of reinforcing an existing structure, steel plates or reinforcing members made of steel plates may be attached to the wall surface of a bridge pier, a reinforced concrete structure, to enhance its seismic resistance. In this case, anchor bolts are attached to the wall surface of the bridge pier to be reinforced, and the anchor bolts are inserted into bolt holes in the reinforcing members, and the reinforcing members are attached to the wall surface using nuts or other fasteners. This reinforces the structure. In this case, the anchor bolts may be installed eccentrically or at an angle from the designed position. Therefore, the position and shape of the openings in the reinforcing members must be accurately measured and adjusted in advance on-site to determine the positions and inclination of the anchor bolts. Similar methods are often used to reinforce the seismic resistance of existing civil engineering and architectural structures.

[0003] A commonly known method for adjusting the position of an anchor bolt hole formed in a reinforcing member or the like is to place a roll of paper on which the design position of the opening in the reinforcing member is written to the tip of the installed anchor bolt, and then trace the position and inclination of the tip of the anchor bolt using India ink or the like. However, this method increases the labor hours of the measurement technician due to advance preparation and measurement work, and can cause problems such as errors due to variations in the skill of the measurement technician and the protrusion length of the anchor bolt.

[0004] To solve the above problems, Patent Document 1 discloses a method for determining the position of an anchor bolt, using image data to measure the position of the anchor bolt, including its inclination. Patent Document 1 includes a process for obtaining the positions of the tip and base of the protruding portion of the anchor bolt by 3D photogrammetry from at least two different sets of image data, and a process for superimposing the obtained positions of the tip and base of the anchor bolt on the shape of the wall surface as viewed from the front. In other words, Patent Document 1 is a technology for determining the position of an anchor bolt by converting two or more sets of photographs into 3D data. Thus, a technology has been proposed for efficiently and accurately measuring the position and inclination of an anchor bolt using IT technology such as 3D measurement. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7084891 Summary of the Invention [Problem to be solved by the invention]

[0006] However, Patent Document 1 requires the acquisition of at least two different sets of image data. Therefore, in places where it is difficult to capture images from multiple locations, such as narrow spaces, it is not possible to grasp the position and shape of the anchor bolt. Patent Document 1 also has the disadvantage of being unable to be used in dark places.

[0007] The present invention has been made to solve the above-mentioned problems, and provides a bracket installation method and bracket installation system that can grasp the position and shape of an anchor bolt even in places where it is difficult to take images from multiple locations or in dark places. [Means for solving the problem]

[0008] The bracket installation method according to the present invention includes a design drawing creation process of creating a bracket design drawing for a bracket to be fixed to an anchor bolt installed in an existing structure; a 3D scanning process of performing three-dimensional measurements of the existing structure, including the anchor bolts installed in the existing structure; a drawing creation process of creating a bolt hole drawing that reflects the positions and shapes of the bolt holes of the anchor bolts based on the results of the three-dimensional measurement; a production drawing creation process of creating a bracket production drawing that displays the actual positions and shapes of the bolt holes of the anchor bolts based on the bracket design drawing and the bolt hole drawing; a bracket creation process of creating the bracket based on the bracket production drawing; and a bracket attachment process of attaching the created bracket to the existing structure using the anchor bolts. [Effects of the Invention]

[0009] According to the present invention, in the 3D scanning process, three-dimensional measurements of the pier are performed, including the anchor bolts installed in the pier. In this way, there is no need to acquire at least two different sets of image data. Therefore, the position and shape of the anchor bolts can be grasped even in places where it is difficult to capture images from multiple locations. Furthermore, since the present invention performs measurements using a 3D scanner that uses, for example, a laser, measurements can be performed even in dark places. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a front view of a bracket and an earthquake-resistant reinforcement device according to the first embodiment. [Figure 2] 1 is a side view of a bracket and an earthquake-resistant reinforcement device according to the first embodiment. [Figure 3] 1 is a block diagram showing a bracket installation system according to a first embodiment. [Figure 4] 4 is a flowchart showing a bracket installation method according to the first embodiment. [Figure 5] FIG. 2 is a schematic diagram showing a bracket design drawing according to the first embodiment. [Figure 6]FIG. 2 is a schematic diagram showing a state in which feature points according to the first embodiment are added to a bridge pier. [Figure 7] FIG. 2 is a schematic diagram showing a three-dimensional measurement method according to the first embodiment. [Figure 8] FIG. 2 is a schematic diagram showing a three-dimensional point cloud model according to the first embodiment. [Figure 9] 4 is a schematic diagram showing a method of matching a bracket design drawing with a three-dimensional point cloud model according to the first embodiment. FIG. [Figure 10] FIG. 2 is a schematic diagram showing a bolt hole diagram according to the first embodiment. [Figure 11] FIG. 2 is a schematic diagram showing a bracket manufacturing drawing according to the first embodiment. [Figure 12] 4 is a schematic diagram showing a method for projecting a bracket production drawing according to the first embodiment. FIG. [Figure 13] FIG. 1 is a perspective view showing a bracket according to the first embodiment. [Figure 14] 1 is a schematic diagram showing a state in which a bracket according to the first embodiment is attached to a bridge pier. FIG. [Figure 15] FIG. 10 is a schematic diagram showing a three-dimensional measurement method according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below. Each figure is a schematic illustration, and the relative size and thickness of each member are not limited to the dimensions shown. Furthermore, the size relationships between each component member in the following drawings may differ from the actual ones.

[0012] Embodiment 1 The present invention relates to a bracket mounting technique for installing anchor bolts 4 in existing structures, such as civil engineering structures like bridges, tunnels, and water gates, and architectural structures like buildings and warehouses, and for fixing brackets 1 to these anchor bolts, and then using these brackets 1 to install accessories such as earthquake-resistant reinforcement devices 2, braces, and seismic isolation dampers. In this first embodiment, an example of earthquake-resistant reinforcement of a bridge pier 3 is shown as an example of the present invention.

[0013] FIG. 1 is a front view of a bracket 1 and an earthquake-resistant reinforcement device 2 according to the first embodiment, and FIG. 2 is a side view of the bracket 1 and the earthquake-resistant reinforcement device 2 according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1. As shown in FIGS. 1 and 2, the bracket 1 is attached to the pier surface 3a of the pier 3 and serves as a member for fixing the earthquake-resistant reinforcement device 2 attached to the pier 3. The bracket 1 has a base plate 1a, which is a steel plate attached to the pier surface 3a of the pier 3, and a bracket body 1b made of multiple steel plates extending perpendicular to the base plate 1a. The bracket 1 is attached to the pier surface 3a of the pier 3 using multiple anchor bolts 4 that are provided so as to partially protrude from the pier surface 3a of the pier 3. On the side of the bracket 1 where the pier 3 is located, bolt holes 5 are formed at positions corresponding to the anchor bolts 4. After the anchor bolts 4 are inserted into the bolt holes 5 of the bracket 1, the bracket 1 is attached to the pier surface 3a of the pier 3 using nuts 7.

[0014] The seismic reinforcement device 2 is placed on a bracket 1, with its bottom fixed to the bracket 1 by bolts. The top of the seismic reinforcement device 2 is fixed to the bridge girder using multiple anchor bolts 4 that protrude partially from the bottom surface of the bridge girder. The seismic reinforcement device 2 is also called a horizontal force distribution device or a displacement control device.

[0015] FIG. 3 is a block diagram showing a bracket installation system 100 according to the first embodiment. As shown in FIG. 3, a 3D scanner 10 is used as a measuring device. Feature points 11 are used during three-dimensional measurement using the 3D scanner 10. Three-dimensional measurement is performed using the 3D scanner 10, and a three-dimensional point cloud model 16 is created based on the results of the three-dimensional measurement. The three-dimensional point cloud model 16 and a bracket design drawing 15 are then transmitted to a processor 12 (a personal computer). The processor 12 then draws a diagram of the shape of the base plate 1a, creates a bolt hole diagram 17 for the anchor bolts 4, compares the bracket design drawing 15 with a plan view of the three-dimensional point cloud model 16, and creates a bracket manufacturing drawing 18. The projector 13 then projects the bracket manufacturing drawing 18 onto the pier 3. Finally, a bracket 1 is created based on the bracket manufacturing drawing 18, and the created bracket 1 is attached to the site where the pier 3 is located. The transmission of the three-dimensional point cloud model 16, the transmission of the bracket design drawing 15, and the transmission from the processor 12 to the projector 13 are all carried out online by a transmission device 14.

[0016] Fig. 4 is a flowchart showing a bracket installation method according to the first embodiment. Next, the bracket installation method will be described. As shown in Fig. 4, the bracket installation method is carried out through a plurality of steps. Note that the following description will be given on the assumption that anchor bolts 4 have already been installed in the pier 3.

[0017] (Step ST1, design drawing process) FIG. 5 is a schematic diagram showing a bracket design drawing 15 according to the first embodiment. As shown in step ST1 of FIG. 4, first, a bracket design drawing 15 of a bracket 1 for fixing an earthquake-resistant reinforcement device 2 to be attached to a pier 3 is created (design drawing creation process). As shown in FIG. 5, the bracket design drawing 15 is a drawing in which bolt holes 5 for anchor bolts 4 formed on the base plate 1a of the bracket 1 are provided. Coordinates A, B, C, and D are defined at the four corners of the base plate 1a. The bracket design drawing 15 is a CAD or BIM drawing.

[0018] (Step ST2, feature point assignment process) FIG. 6 is a schematic diagram showing a state in which feature points 11 according to the first embodiment are provided on a pier 3. As shown in step ST2 of FIG. 4, feature points 11 are provided at the coordinate positions of the four corners of the base plate 1a of the bracket 1 (feature point providing step). As shown in FIG. 6, coordinates A, B, C, and D are marked on the pier surface 3a of the pier 3, and target stickers representing feature points 11 are affixed to the coordinate positions A, B, C, and D. The feature points 11 are to be the coordinate positions when the bracket 1 is attached to the pier 3. Note that the feature points 11 are not limited to the four corners of the base plate 1a, and they may be affixed to positions off the base plate 1a as long as the position of the base plate 1a can be calculated. Furthermore, it is sufficient that at least two feature points 11 are provided. As shown in FIG. 6, the existing anchor bolts 4 may have an installation position error or be installed at an angle, and therefore may not overlap with the bolt holes 5 displayed on the bracket design drawing 15.

[0019] (Step ST3, 3D scanning process) Fig. 7 is a schematic diagram showing a 3D measurement method according to the first embodiment. As shown in step ST3 of Fig. 4, 3D measurement of the pier 3 is performed, including the anchor bolt 4 and feature points 11 provided on the pier 3 (3D scanning process). As shown in Fig. 7, the 3D measurement is performed using a handheld non-contact 3D scanner 10 that performs measurement without contacting the pier 3. Note that the 3D measurement may also be performed using a contact 3D scanner 10 that performs measurement by directly contacting the pier 3. The 3D measurement is performed by scrolling the entire periphery of the anchor bolt 4 of the pier 3 so that the feature points 11 are reflected in the image.

[0020] (Step ST4, model creation process) FIG. 8 is a schematic diagram illustrating a 3D point cloud model 16 according to the first embodiment. As shown in step ST4 of FIG. 4, the 3D point cloud model 16 is created using point cloud data obtained by 3D measurement (model creation process). Here, in the 3D measurement performed in step ST3, the 3D point cloud data is recorded in the 3D scanner 10, and the 3D point cloud model 16 is automatically calculated and created. The overall 3D data is created by analyzing and accurately combining the point cloud trends of the lap portions of the images scroll-captured by the 3D scan. As shown in FIG. 8, when the 3D point cloud model 16 is viewed obliquely, the positional error of the anchor bolt 4 and the inclination of the anchor bolt 4 are shown. Note that the positional error and the inclination of the anchor bolt 4 are caused by avoiding existing rebars or misalignment of the drilling position due to interference when the anchor bolt 4 is installed. Note that in FIG. 8, a tape measure 6 is provided to measure dimensions.

[0021] (Step ST5, matching process) FIG. 9 is a schematic diagram illustrating a method for comparing a bracket design drawing 15 and a three-dimensional point cloud model 16 according to the first embodiment. As shown in step ST5 of FIG. 4, the bracket design drawing 15 is compared with a plan view of the three-dimensional point cloud model 16 to determine whether the three-dimensional measurement is appropriate (matching step). As shown in FIG. 9, the created three-dimensional point cloud model 16 is verified by comparing it with the bracket design drawing 15 to determine whether it is an inaccurate model due to measurement or analysis errors. The lengths of the line segments connecting the coordinates A, B, C, and D are compared with the dimensions of the bracket design drawing 15. If the lengths are within the tolerance of 3 mm, the three-dimensional point cloud model 16 is determined to be valid (YES in step ST5 of FIG. 4). In this case, the process proceeds to step ST6. Note that in FIG. 9, the feature points 11 and bolt holes 5 in the bracket design drawing 15 are the feature points 11 and bolt holes 5 in the bracket design drawing 15. The feature points 11 in black are the feature points 11 in the three-dimensional point cloud model 16.

[0022] In contrast, the lengths of the line segments connecting the coordinates A, B, C, and D are compared with the dimensions of the bracket design drawing 15. If the lengths are outside the 3 mm tolerance range, the 3D point cloud model 16 is determined to be inappropriate (NO in step ST5 in FIG. 4). In this case, the process returns to step ST3 and the 3D measurement is performed again. Note that the data of the 3D point cloud model 16 may be corrected by computational processing so that the errors between the positions of the coordinates A, B, C, and D in the 3D point cloud model 16 and the coordinates in the bracket design drawing 15 fall within the tolerance range. At this time, the relationship between the position of the bolt hole 5 in the bracket design drawing 15 and the position of the anchor bolt 4 in the 3D point cloud model 16 is also taken into consideration in determining the validity of the model.

[0023] (Step ST6, bolt hole diagram creation process) FIG. 10 is a schematic diagram showing a bolt hole diagram 17 according to the first embodiment. As shown in step ST6 in FIG. 4, a bolt hole diagram 17 reflecting the position and shape of the bolt hole 5 of the anchor bolt 4 is created based on the results of the three-dimensional measurement (bolt hole diagram creation step). Specifically, if it is determined that the three-dimensional measurement is appropriate (YES in step ST5), the positions and shapes of the tip and base of the anchor bolt 4 in the three-dimensional point cloud model 16 are calculated, and a bolt hole diagram 17 reflecting the position and shape of the bolt hole 5 of the anchor bolt 4 is created. CAD data is created based on the mesh data of the three-dimensional point cloud model 16. The positions of the tip and base of the anchor bolt 4 are calculated from the CAD data, and the bolt hole diagram 17 is created as shown in FIG. 10. The bolt hole 5 is, for example, an enlarged hole or an elongated hole. An enlarged hole is used to encompass the base and tip of the anchor bolt 4 when there is not much deviation between the base and tip of the anchor bolt 4. The elongated hole is used to encompass the base and tip of the anchor bolt 4 when there is a significant misalignment between the base and tip. The hole has a clearance of, for example, 2 mm. In Figure 10, the bolt holes 5 are classified into the following patterns A, B, and C. Pattern A is a normal hole used when the base and tip of the anchor bolt 4 are in the same position. Pattern B is an enlarged hole used when there is a slight misalignment between the base and tip of the anchor bolt 4. Pattern C is an elongated hole used when there is a large misalignment between the base and tip of the anchor bolt 4.

[0024] (Step ST7, production drawing creation process) Fig. 11 is a schematic diagram showing a bracket production drawing 18 according to embodiment 1. As shown in step ST7 in Fig. 4, a bracket production drawing 18 displaying the positions and shapes of bolt holes 5 of actual anchor bolts 4 is created based on bracket design drawing 15 and bolt hole drawing 17 (production drawing creation process). As shown in Fig. 11, bracket production drawing 18 displays bolt holes 5 that reflect the positions and shapes of bolt holes 5 of actual anchor bolts 4 in relation to bracket design drawing 15.

[0025] (Step ST8, projection process) FIG. 12 is a schematic diagram showing a method for projecting a bracket production drawing 18 according to the first embodiment. As shown in step ST8 of FIG. 4, the bracket production drawing 18 is projected onto the pier 3, and the bracket production drawing 18 is corrected based on the projection results (projection process). As shown in FIG. 12, a projector 13, such as a projector, projects the bracket production drawing 18 onto the position on the pier 3 where the bracket 1 is to be attached. It is confirmed whether the existing anchor bolt 4 falls within the range of the bolt hole 5 displayed on the bracket production drawing 18. This significantly reduces the labor required compared to a method in which the bracket production drawing 18 is printed on paper and attached to the pier surface 3a. If the anchor bolt 4 falls within the range of the bolt hole 5 displayed on the bracket production drawing 18, the bracket production drawing 18 is used as is to create the bracket 1 without being corrected. If the anchor bolt 4 is outside the range of the bolt hole 5 displayed on the bracket production drawing 18, the bracket production drawing 18 is corrected, and the projection process is performed again.

[0026] (Step ST9, bracket creation process) Fig. 13 is a perspective view showing the bracket 1 according to embodiment 1. As shown in step ST9 of Fig. 4, the bracket 1 is produced based on the bracket production drawing 18 (bracket production step). As shown in Fig. 13, the produced bracket 1 has bolt holes 5 formed that reflect the positions and shapes of the actual anchor bolts 4.

[0027] (Step ST10, bracket installation process) 14 is a schematic diagram showing a state in which the bracket 1 according to the first embodiment is attached to the pier 3. As shown in step ST10 of FIG. 4, the created bracket 1 is fixed to the pier 3 using anchor bolts 4 (bracket attaching step). As shown in FIG. 14, the bolt holes 5 formed in the bracket 1 reflect the positions and shapes of the actual anchor bolts 4. Therefore, if the anchor bolts 4 do not pass through the bolt holes 5 of the bracket 1 on site, It can be attached to the pier 3 without any processing such as expanding the bolt hole 5.

[0028] (Step ST11, seismic reinforcement device installation process) As shown in step ST11 of Fig. 4, the earthquake-resistant reinforcement device 2 is attached to the top of the bracket 1. This reinforces the earthquake resistance of the pier 3 (earthquake-resistant reinforcement device attaching step).

[0029] According to the first embodiment, in the 3D scanning process, three-dimensional measurement of the pier 3 is performed, including the anchor bolts 4 installed in the pier 3. Conventionally, a technique for determining the position of the anchor bolts 4 by converting two or more sets of photographs into three-dimensional data is known. In this case, it is necessary to acquire at least two different sets of image data. Therefore, in a location where it is difficult to capture images from multiple locations, such as a narrow scaffold or a work platform, it is not possible to grasp the position and shape of the anchor bolts 4. Furthermore, in a dark location surrounded by the bridge deck and the piers, it is not possible to capture clear images, and the position and shape of the anchor bolts 4 cannot be grasped. In contrast, as described above, in the first embodiment, three-dimensional measurement of the pier 3 is performed, including the anchor bolts 4 installed in the pier 3, in the 3D scanning process. Therefore, it is not necessary to acquire at least two different sets of image data. Therefore, the position and shape of the anchor bolts 4 can be grasped even in a location where it is difficult to capture images from multiple locations or in a dark location where it is difficult to capture clear images. For example, using a handheld 3D scanner 10 in three-dimensional measurement makes it easier to capture images.

[0030] Furthermore, in the first embodiment, there is no need to manually place rolled paper, mark the position of the tip of the anchor bolt 4, and measure the marked position. This eliminates problems such as writing errors and manual reading errors. Furthermore, with conventional imaging technology, two-dimensional data is converted into three-dimensional data, which requires time for data processing. In contrast, in the first embodiment, the three-dimensional data itself can be obtained directly, so data processing does not require time.

[0031] The first embodiment uses three-dimensional point cloud data of the state of the anchor bolt 4 acquired by a 3D scanner 10. Therefore, the protrusion length, tilt state, base and tip positions, deformation and other abnormalities of the anchor bolt 4 can be confirmed as data, and appropriate as-built management can be performed. Furthermore, the preparation required for three-dimensional measurement is simply to set feature points 11 around the measurement target, so the hurdle for measurement preparation is low. Therefore, it is possible to shorten the construction period and save labor.

[0032] Furthermore, the bracket installation system 100 performs a step of creating a bolt hole diagram 17 that reflects the positions and shapes of the bolt holes 5 of the anchor bolts 4 provided in the pier 3, based on the results of the three-dimensional measurement by the 3D scanner 10. Then, the bracket installation system 100 performs a step of creating a bracket production drawing 18 that describes the positions and shapes of the bolt holes 5 of the actual anchor bolts 4, based on the bracket design drawing 15 and bolt hole diagram 17 of the bracket 1 that secures the seismic reinforcement device 2 to be attached to the pier 3. The bracket installation system 100 of the first embodiment is operated online, and therefore can create the bracket production drawing 18 in real time.

[0033] (Variation) FIG. 15 is a schematic diagram showing a 3D measurement method according to a modified example. In this modified example, the 3D scanning process involves 3D measurement of a pier 3, with the measurement ranges being a grid or lattice pattern, and overlapping portions of adjacent measurement ranges. The target of 3D measurement is the anchor bolt 4, and since measurement values ​​around the anchor bolt 4 are sufficient, there is little need to measure the entire surface of the pier 3 over a wide area. Therefore, a compact 3D scanner 10 with a narrow scanning range is used to scan a grid or lattice pattern area encompassing coordinates A and B and the anchor bolt 4, as shown in FIG. 15. In this case, at least two feature points 11 are sufficient. Note that when measuring a grid-shaped area, it is preferable that the field of view of the 3D scanner 10 be rectangular. This reduces the amount of data, shortening processing time and saving labor. Furthermore, the 3D scanner 10 can be made compact, making it easy to work in extremely small locations.

[0034] The above example shows the case of earthquake-resistant reinforcement of bridge piers 3, but the same method, system, and structural member configuration can also be applied to earthquake-resistant reinforcement of existing civil engineering and architectural structures.

[0035] The bracket installation method and bracket installation system 100 described above may also include the following combinations of features, which are described below. [Appendix 1] A design drawing process for creating a bracket design drawing for a bracket to be fixed to an anchor bolt installed in an existing structure; a 3D scanning process for performing three-dimensional measurement of the existing structure, including anchor bolts installed in the existing structure; a drawing creation step of creating a bolt hole diagram that reflects the positions and shapes of the bolt holes of the anchor bolts based on the results of the three-dimensional measurement; a production drawing creation process for creating a bracket production drawing, which indicates the positions and shapes of the bolt holes of the actual anchor bolts, based on the bracket design drawing and the bolt hole drawing; a bracket manufacturing process for manufacturing the bracket based on the bracket manufacturing drawing; a bracket attaching step of attaching the prepared bracket to the existing structure using the anchor bolt; A bracket installation method comprising: [Appendix 2] The method further includes a feature point assigning step of assigning at least two feature points that become coordinate positions when attaching the bracket to the existing structure, The 3D scanning process includes: A three-dimensional measurement of the existing structure is performed, including the anchor bolts and the characteristic points provided in the existing structure. Bracket installation method described in Appendix 1. [Appendix 3] a model creation process of creating a 3D point cloud model using point cloud data obtained by the 3D measurement; and a comparison step of comparing the bracket design drawing with a plan view of the three-dimensional point cloud model to determine whether the three-dimensional measurement is appropriate. The drawing creation step includes: If the three-dimensional measurement is determined to be appropriate, the positions and shapes of the tip and base of the anchor bolt in the three-dimensional point cloud model are calculated, and the bolt hole diagram that reflects the positions and shapes of the bolt holes of the anchor bolt is created. Bracket installation method described in Appendix 1 or 2. [Appendix 4] The method further includes a projection step of projecting the bracket manufacturing drawing onto the existing structure and correcting the bracket manufacturing drawing based on a projection result. A bracket installation method according to any one of appendices 1 to 3. [Appendix 5] The 3D scanning process includes: In the three-dimensional measurement of the existing structure, the measurement range is set in a grid or lattice pattern, and a part of the adjacent measurement range is overlapped. A bracket installation method according to any one of appendices 1 to 4. [Appendix 6] The 3D scanning process includes: A non-contact 3D scanner is used to measure the existing structure in three dimensions without contact. A bracket installation method according to any one of appendices 1 to 5. [Appendix 7] The 3D scanning process includes: A contact-type 3D scanner is used to directly contact the existing structure and perform 3D measurements. A bracket installation method according to any one of appendices 1 to 5. [Appendix 8] By running the program, A step of creating a bolt hole diagram that reflects the positions and shapes of bolt holes of anchor bolts provided in the existing structure based on the results of the three-dimensional measurement using the 3D scanner; A step of creating a bracket manufacturing drawing on which the positions and shapes of the bolt holes of the actual anchor bolts are described based on a bracket design drawing of a bracket for fixing an accessory to be attached to the existing structure and the bolt hole drawing; Bracket mounting system. [Explanation of symbols]

[0036] 1 Bracket, 1a Base plate, 1b Bracket body, 2 Earthquake-resistant reinforcement device, 3 Pier, 3a Pier surface, 4 Anchor bolt, 5 Bolt hole, 6 Tape measure, 7 Nut, 10 3D scanner, 11 Feature points, 12 Processor, 13 Projector, 14 Transmission device, 15 Bracket design drawing, 16 3D point cloud model, 17 Bolt hole drawing, 18 Bracket manufacturing drawing, 100 Bracket installation system.

Claims

1. A design drawing process for creating a bracket design drawing for a bracket to be fixed to an anchor bolt installed in an existing structure; a 3D scanning process for performing three-dimensional measurement of the existing structure, including anchor bolts provided in the existing structure; a drawing creation step of creating a bolt hole diagram that reflects the positions and shapes of the bolt holes of the anchor bolts based on the results of the three-dimensional measurement; a production drawing creation process for creating a bracket production drawing, which indicates the positions and shapes of the bolt holes of the actual anchor bolts, based on the bracket design drawing and the bolt hole drawing; a bracket manufacturing process for manufacturing the bracket based on the bracket manufacturing drawing; a bracket attaching step of attaching the prepared bracket to the existing structure using the anchor bolt; A bracket installation method comprising:

2. The method further includes a feature point assigning step of assigning at least two feature points that become coordinate positions when the bracket is attached to the existing structure, The 3D scanning process includes: A three-dimensional measurement of the existing structure is performed, including the anchor bolts and the characteristic points provided in the existing structure. The bracket installation method according to claim 1.

3. a model creation step of creating a three-dimensional point cloud model using point cloud data obtained by the three-dimensional measurement; a comparison step of comparing the bracket design drawing with a plan view of the three-dimensional point cloud model to determine whether the three-dimensional measurement is appropriate, The drawing creation step includes: If it is determined that the three-dimensional measurement is appropriate, the positions and shapes of the tip and base of the anchor bolt in the three-dimensional point cloud model are calculated, and the bolt hole diagram that reflects the positions and shapes of the bolt holes of the anchor bolt is created. The bracket installation method according to claim 1 or 2.

4. The method further includes a projection step of projecting the bracket manufacturing drawing onto the existing structure and correcting the bracket manufacturing drawing based on a projection result. The bracket installation method according to claim 1 or 2.

5. The 3D scanning process includes: In the three-dimensional measurement of the existing structure, the measurement range is set in a grid or lattice pattern, and a part of the adjacent measurement range is overlapped. The bracket installation method according to claim 1 or 2.

6. The 3D scanning process includes: A non-contact 3D scanner is used to measure the existing structure in three dimensions without contact. The bracket installation method according to claim 1 or 2.

7. The 3D scanning process includes: A contact-type 3D scanner is used to perform 3D measurements by directly contacting the existing structure. The bracket installation method according to claim 1 or 2.

8. By running the program, A step of creating a bolt hole diagram that reflects the positions and shapes of bolt holes of anchor bolts provided in the existing structure based on the results of the three-dimensional measurement by the 3D scanner; A step of creating a bracket manufacturing drawing on which the positions and shapes of the bolt holes of the actual anchor bolts are described based on a bracket design drawing of a bracket for fixing an accessory to be attached to the existing structure and the bolt hole drawing; Bracket mounting system.

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