Dimension measurement method, dimension measurement system, and construction preparation method

Abstract

The present invention makes it possible to measure a dimension of a portion without installing a scaffold even if the portion is at high elevation where the dimension cannot be visually measured unless a scaffold is installed. One embodiment of the present invention comprises: a first placement step for moving a first movable body (12) having a dimension portion with at least one dimension known in advance to place the first movable body (12) at a location in the vicinity of an object (80) to be measured; a second placement step for moving a second movable body (14) equipped with an imaging means (14A) to place the second movable body (14) in a photographable area in which a photograph of the object (80) to be measured can be taken; and an imaging step for taking a photograph at each of a first position and a second position different from the first position within the photographable area in which the second movable body (14) has been placed in the second placement step, the photograph including both the object (80) to be measured and the dimension portion as subjects.

Description

Dimension measurement method, dimension measurement system, and construction setup method

[0001] The present invention relates to a dimension measurement method, a dimension measurement system, and a construction setup method, and more particularly, to a dimension measurement method, a dimension measurement system, and a construction setup method using a mobile body. The mobile body in this application includes both those that are airborne and those that are not airborne. Airborne mobile bodies include multi-rotor unmanned aerial vehicles (hereinafter, generally referred to as "UAVs"), and UAVs include so-called drones. In this application, "airborne" means being able to move without coming into contact with the ground or objects on the ground.

[0002] In order to keep bridges in service safely, in addition to routine maintenance, it is necessary to appropriately repair, reinforce, or renew bridges depending on their damage status. Reinforcement design is required when reinforcing the structure to make it stronger than it was originally, and design is required when rebuilding or reinforcing the superstructure or replacing the bearings in the support sections. Repair design may also be required when repairing a damaged structure to restore it to its original state.

[0003] When carrying out these design tasks, it is important to accurately grasp the current state of the bridge, and in particular when rebuilding or reinforcing the superstructure or replacing the bearings of the bearings, it is important to accurately grasp the current dimensions of the bearings. Here, in this application, the bearings include not only the bearings themselves, but also the parts of the main girders and other members near the bearings, and the parts of the substructure (piers and abutments).

[0004] Conventionally, when measuring the current dimensions of a support part, measurements have been made by close visual inspection, and for piers above a certain height, it has become necessary to set up scaffolding. For example, paragraph 0004 of Patent Document 1 states that scaffolding is required for maintenance work on support parts, and similarly, currently, scaffolding must be set up when measuring the dimensions of a support part. Scaffolding is also required for transporting and installing replacement or installation components.

[0005] On the other hand, when replacing or reinforcing the superstructure or replacing the supports of the support sections, the design work cannot begin until the measurement results of the current dimensions of the support sections are obtained, as this requires the current dimensions of the supports and main girders that make up the support sections as a design premise.

[0006] For this reason, in the case of bridge construction where the current dimensions of the bearings are required as a premise for design, the flow from receiving an order for construction to carrying out the bridge construction is as follows, as shown in the flowchart in Figure 6: after receiving an order for construction (Step S101), consultations on scaffolding installation are held (Step S102), the scaffolding is installed (Step S103), the dimensions of the bearings are measured using the installed scaffolding (Step S104), after the measurement results of the current dimensions of the bearings are obtained, design work begins (Step S105), the design work is carried out (Step S106), and the bridge construction is carried out (Step S107). Therefore, currently, even if an order is received for construction, design work for rebuilding or reinforcing the superstructure or replacing the bearings of the bearings cannot begin for the two to three months required for Steps S102, S103, and S104, resulting in a waiting period of about two to three months after the construction order is received before design work can begin.

[0007] Patent No. 6344879

[0008] The present invention has been made in consideration of the above points, and an object of the present invention is to provide a dimension measurement method and dimension measurement system that can measure the dimensions of high-altitude locations, the dimensions of which cannot be measured visually without installing scaffolding, without installing scaffolding, and a construction setup method that uses the dimension measurement method.

[0009] The present invention is an invention that solves the above-mentioned problems, and provides the following dimension measurement method, dimension measurement system, and construction setup method.

[0010] That is, a first aspect of the dimension measurement method according to the present invention is a dimension measurement method for measuring the dimensions of a measurement object, comprising: a first placement step of moving a first movable body having a dimensional portion whose dimensions at least part of which are known in advance, and placing it at a location near the measurement object; a second placement step of moving a second movable body equipped with a photographing means, and placing it in a photographable area where photographs of the measurement object can be taken; and a photographing step of taking photographs that include the measurement object and the dimensional portion together as subjects at a first position and a second position different from the first position within the photographable area where the second movable body is placed in the second placement step.

[0011] Here, the "dimensional part" is a part whose dimensions are at least partially known in advance, which can be photographed, and which is visible from the outside.

[0012] Furthermore, in this application, the placement of a mobile body refers to the mobile body coming to rest at a predetermined position, and includes not only cases where the mobile body comes to rest at a predetermined position in contact with the ground or an object (for example, when a mobile body in flight lands on the ground or an object on the ground at a predetermined position (here, landing of a mobile body in flight refers to a state where the mobile body in flight is placed on the ground or an object on the ground)), but also cases where the mobile body comes to rest at a predetermined position while floating in the air (for example, when the mobile body comes to rest at a predetermined position while hovering in the air). Here, an object on the ground is typically a structure fixed to the ground, but is not limited to a structure as long as it has a certain size that allows the placed mobile body to come to rest in contact with the object and its position on the ground is stable.

[0013] Furthermore, the phrase "when it comes into contact with an object and comes to a stationary state at a predetermined position" in the previous paragraph is not limited to when it comes into contact with the upward-facing surface of the object and comes to a stationary state at a predetermined position (for example, when it is placed on the upward-facing surface of the object and comes to a stationary state at a predetermined position), but also includes when it comes into contact with the downward-facing surface of the object, a surface that extends in the vertical direction, an inclined surface, etc. Furthermore, "when it comes into contact with an object and comes to a stationary state at a predetermined position" also includes when it comes into contact with the object while floating in the air and comes to a stationary state at a predetermined position (for example, when it is floating in the air by hovering and is pressed against the wall of the object and comes to a stationary state at a predetermined position).

[0014] The contents described in the preceding two paragraphs shall also apply to the contents described in other aspects of the present application related to the first aspect of the dimension measurement method of the present invention, unless otherwise specified.

[0015] Furthermore, in the first aspect of the dimension measurement method according to the present invention, "disposing the first movable body at a point near the measurement object" means disposing the first movable body in a region near the measurement object so that the first aspect of the dimension measurement method according to the present invention can be implemented. Therefore, as long as the first aspect of the dimension measurement method according to the present invention can be implemented, disposing the first movable body at a certain distance from the measurement object also falls under the term "disposing the first movable body at a point near the measurement object" in the first aspect of the dimension measurement method according to the present invention. In this application, "nearby" in other aspects related to the first aspect of the dimension measurement method according to the present invention shall be interpreted in the same way unless otherwise specified.

[0016] A second aspect of the dimension measurement method according to the present invention is a dimension measurement method according to the first aspect, characterized in that the object to be measured is a support part of a bridge structure, and in the first placement step, the first movable body is placed at a point near the support part.

[0017] Here, "bearing part as a bridge structure" includes bearings installed on piers and abutments, as well as surrounding areas of the bearings (for example, parts of components such as main girders near the bearings and parts of the substructure (piers and abutments)).

[0018] A third aspect of the dimension measurement method according to the present invention is a dimension measurement method according to the first or second aspect, characterized in that the first movable body is equipped with a light source, and in the photographing process, photographing is performed using the light source.

[0019] A fourth aspect of the dimension measurement method according to the present invention is a dimension measurement method for measuring the dimensions of a measurement object, comprising: a first placement step of moving a first movable body having a dimension portion whose dimensions at least part of which are known in advance, and placing it at a location near the measurement object; a second placement step of moving a second movable body equipped with a photographing means, and placing it in a photographable area where photographs of the measurement object can be taken; and a photographing step of photographing the dimension portion and the measurement object as subjects at a first position and a second position different from the first position within the photographable area where the second movable body is placed in the second placement step, with the dimension portion and the measurement object as subjects in separate photographs, and photographing at each of the first position and the second position with an overlap rate that allows the photographs taken as separate photographs to be connected by splicing together the photographs of the measurement object and the dimension portion.

[0020] Here, in the fourth aspect of the dimension measurement method according to the present invention, "disposing the first movable body at a point near the measurement object" means disposing the first movable body in an area near the measurement object so that the fourth aspect of the dimension measurement method according to the present invention can be implemented. Therefore, as long as the fourth aspect of the dimension measurement method according to the present invention can be implemented, even if the first movable body is disposed at a certain distance from the measurement object, this also falls under the term "disposing the first movable body at a point near the measurement object" in the fourth aspect of the dimension measurement method according to the present invention. In this application, "nearby" in other aspects related to the fourth aspect of the dimension measurement method according to the present invention shall be interpreted in the same way unless otherwise specified.

[0021] A fifth aspect of the dimension measurement method according to the present invention is the dimension measurement method of the fourth aspect, characterized in that the overlap ratio is 80% or more.

[0022] A sixth aspect of the dimension measurement method according to the present invention is a dimension measurement method according to any one of the first to fifth aspects, characterized in that the photographs taken in the photographing process include three or more photographs taken from different points.

[0023] A seventh aspect of the dimension measurement method according to the present invention is a dimension measurement method according to any one of the first to sixth aspects, characterized in that it further comprises a three-dimensional model construction step of constructing a three-dimensional model of the measurement object using data of the photograph taken in the photographing step, and a dimension calculation step of calculating the dimensions of the measurement object based on the three-dimensional model constructed in the three-dimensional model construction step.

[0024] In this application, "constructing a three-dimensional model of the object to be measured" does not require actually creating a three-dimensional replica (copy) or actually displaying a three-dimensional image of the object to be measured on a display. If data on the position coordinates of each point on the outline of the object to be measured can be obtained by performing calculations such that the dimensions of the object to be measured satisfying the required accuracy, then "constructing a three-dimensional model of the object to be measured" is satisfied. Furthermore, if data on the position coordinates of each point on the outline of the object to be measured can be obtained by performing calculations such that the dimensions of the object to be measured satisfying the required accuracy, then "constructing a three-dimensional model of the object to be measured" is satisfied even if data on the position coordinates of each point on only part of the outline of the object to be measured, rather than the entire outline, is obtained.

[0025] An eighth aspect of the dimension measurement method of the present invention is a dimension measurement method according to any one of the first to seventh aspects, characterized in that, of the first movable body and the second movable body, at least the first movable body is capable of moving in the air, and in the first placement step, the first movable body is moved in the air and placed at a point near the object to be measured.

[0026] A ninth aspect of the dimension measurement method according to the present invention is a dimension measurement method according to the eighth aspect, characterized in that in the first placement step, the first movable body is moved through the air and landed at a point near the object to be measured.

[0027] A tenth aspect of the dimension measurement method according to the present invention is a dimension measurement method according to the eighth aspect, characterized in that the first movable body is provided with an attachment means capable of attaching to another object, and in the first placement step, the attachment means is attached to the other object and the first movable body is placed at a point near the object to be measured.

[0028] An eleventh aspect of the dimension measurement method according to the present invention is the dimension measurement method of the tenth aspect, characterized in that the attachment means is an attachment means using magnetic force.

[0029] A twelfth aspect of the dimension measurement method according to the present invention is the dimension measurement method of the tenth aspect, characterized in that the attachment means is attachment means using suction means.

[0030] A thirteenth aspect of the dimension measurement method according to the present invention is a dimension measurement method according to the eighth aspect, characterized in that in the first placement step, the first movable body is placed at a point near the object to be measured while being suspended in the air.

[0031] A first aspect of the construction setup method according to the present invention comprises a dimension measurement step of measuring dimensions of a high-altitude portion of a structure using a dimension measurement method according to any one of the first to thirteenth aspects, a design step of designing the structure based on the dimensions of the high-altitude portion measured in the dimension measurement step, and a scaffolding installation step of installing scaffolding for carrying out construction work, and is a construction setup method characterized in that the scaffolding installation step is carried out in parallel with the dimension measurement step and the design step.

[0032] Here, a high-altitude part of a structure refers to a part whose dimensions cannot be measured visually without some means of access, and specifically, for example, a support installed on the top of a bridge pier above a certain height.

[0033] A second aspect of the construction work setup method according to the present invention is the construction work setup method of the first aspect, characterized in that the structure is a bridge.

[0034] A third aspect of the construction setup method according to the present invention is the construction setup method of the second aspect, characterized in that the elevated portion whose dimensions are measured in the dimension measurement process is a bearing portion of the bridge.

[0035] A fourth aspect of the construction setup method according to the present invention comprises a dimension measurement step of measuring dimensions of a high-altitude portion of a structure using a dimension measurement method according to any one of the eighth to thirteenth aspects, a design step of designing the structure based on the dimensions of the high-altitude portion measured in the dimension measurement step, and a scaffolding installation step of installing scaffolding for carrying out construction work, and is a construction setup method characterized in that the scaffolding installation step is carried out in parallel with the dimension measurement step and the design step.

[0036] A first aspect of the dimension measurement system of the present invention is a dimension measurement system that measures the dimensions of a measurement object, comprising: a first movable body having a dimensional portion whose dimensions are at least partially known in advance; a second movable body equipped with a photographing means; and a control unit that controls the operation of the first movable body and the second movable body, wherein the control unit controls the movement of the first movable body so that the first movable body is positioned in the vicinity of the measurement object, and controls the movement and photographing operations of the second movable body so that photographs are taken at two or more different photographing positions so that at least two photographs include the dimensional portion together with the measurement object.

[0037] Here, in the first aspect of the dimension measurement system according to the present invention, the phrase "the first movable body is placed at a point near the measurement object" means that the first movable body is placed in a region near the measurement object so that the first aspect of the dimension measurement system according to the present invention can be implemented. Therefore, as long as the first aspect of the dimension measurement system according to the present invention can be implemented, even if the first movable body is placed at a certain distance from the measurement object, this is also included in the case of "placing the first movable body at a point near the measurement object" in the first aspect of the dimension measurement system according to the present invention. In this application, "nearby" in other aspects related to the first aspect of the dimension measurement system according to the present invention will be interpreted in the same way unless otherwise specified.

[0038] A second aspect of the dimension measurement system according to the present invention is a dimension measurement system according to the first aspect, characterized in that the dimension portion includes a plurality of dimension reference points that serve as references for dimension measurement, and the plurality of dimension reference points are arranged in a manner that allows them to be distinguished from one another, so that it is possible to determine at which location on the first movable body the dimension reference points shown in a photograph are arranged.

[0039] A third aspect of the dimension measurement system of the present invention is a dimension measurement system of the first or second aspect, characterized in that it further comprises a three-dimensional model construction unit that constructs a three-dimensional model of the measurement object using data about the photograph taken by the second movable body, and a dimension calculation unit that calculates the dimensions of the measurement object based on the three-dimensional model constructed by the three-dimensional model construction unit.

[0040] A fourth aspect of the dimension measurement system of the present invention is a dimension measurement system of any of the first to third aspects, characterized in that the object to be measured is a bearing part of a bridge, and the control unit controls the movement of the first movable body so that the first movable body is positioned at a point on the top of a pier of the bridge and near the bearing part.

[0041] A fifth aspect of the dimension measurement system of the present invention is a dimension measurement system of any of the first to fourth aspects, characterized in that, of the first movable body and the second movable body, at least the first movable body is capable of moving in the air, and the control unit controls the first movable body to move in the air and be positioned at a point near the object to be measured.

[0042] According to the present invention, it is possible to provide a dimension measurement method and dimension measurement system that can measure dimensions without installing scaffolding, even at high altitudes where dimensions cannot be measured visually without installing scaffolding, as well as a construction setup method that uses the dimension measurement method.

[0043] A block diagram showing the configuration of a dimension measurement system 10 according to a first embodiment of the present invention. A schematic diagram showing a situation in which an imaging UAV 14 is imaging a support section 80, which is the measurement target, in the first embodiment of the present invention. A front view of a dimension reference UAV 12 used in the first embodiment of the present invention. A top view of a dimension reference UAV 12 used in the first embodiment of the present invention. A flowchart showing the procedure of a dimension measurement method according to a first embodiment of the present invention. A flowchart showing the procedure of a construction setup method according to a first embodiment of the present invention. In the case of bridge construction, where the current dimensions of the support section are required as a premise for design, the conventional procedure from receiving an order for construction to carrying out bridge construction is shown. Schematic diagram showing an example of the implementation of the second embodiment of the present invention. Enlarged schematic diagram showing an example of the implementation of the second embodiment of the present invention (enlarged schematic diagram of a partial area of ​​FIG. 7). Schematic diagram showing an example of the implementation of the second embodiment of the present invention. Enlarged schematic diagram showing an example of the implementation of the second embodiment of the present invention (enlarged schematic diagram of a partial area of ​​FIG. 9). Enlarged schematic diagram showing an example of the implementation of the second embodiment of the present invention (enlarged schematic diagram showing a state in which a dimension reference UAV 26 is attached to the underside of the lower flange of the steel main girder 104 by the attachment means 24 and is stationary). Schematic diagram showing an example of the implementation of the third embodiment of the present invention.

[0044] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In describing the embodiments of the present invention, measuring the dimensions of a bridge support is taken into consideration, but the application of the dimensional measurement according to the present invention is not limited to bridge support parts, and the present invention can also be used to measure the dimensions of each part and each component of a bridge other than support parts. Furthermore, the application of the dimensional measurement according to the present invention is not limited to each part and each component of a bridge, and the present invention can be used to measure the dimensions of each part and each component of a wide range of objects, including structures in general.

[0045] (1) First embodiment (1-1) Embodiment of dimension measurement system Figure 1 is a block diagram showing the configuration of a dimension measurement system 10 according to the first embodiment of the present invention, Figure 2 is a schematic diagram showing a situation in which an imaging UAV 14 is photographing a support part 80, which is the object to be measured, in the first embodiment of the present invention, and Figures 3A and 3B are figures showing a dimension reference UAV 12 used in the first embodiment of the present invention, where Figure 3A is a front view of the dimension reference UAV 12 and Figure 3B is a top view of the dimension reference UAV 12.

[0046] The dimension measurement system 10 according to the first embodiment of the present invention is a dimension measurement system capable of remotely measuring the dimensions of a measurement object, and includes a dimension reference UAV 12, a photographing UAV 14, a computer 16, and a control unit 50. The control unit 50 is equipped with a communication unit 50A (see FIG. 2), and the dimension reference UAV 12 and the photographing UAV 14 are equipped with communication means (not shown) for communicating with the control unit 50. The control unit 50 communicates with the dimension reference UAV 12 and the photographing UAV 14 via electrical signals to control the flight operations of the dimension reference UAV 12 and the flight operations and photographing operations of the photographing UAV 14.

[0047] The role of the dimension reference UAV 12 is to provide a dimensional reference by appearing in the same photograph as the measurement object so that the dimensions of the measurement object can be calculated from the photograph. Therefore, the dimension reference UAV 12 is placed in a landed state at a location near the measurement object. In this first embodiment, the dimension reference UAV 12 flies in response to an instruction via an electrical signal from the control unit 50 and lands at a location on the top of the pier 102 of the bridge 100, near the measurement object, the support 80, and at a location that is likely to appear in the same photograph as the support 80.

[0048] As shown in Figures 3A and 3B, dimension reference points 12A are provided at multiple locations on the body of the dimension reference UAV 12, and multiple dimension reference points 12A are provided on the body of the dimension reference UAV 12. Although the dimension reference points 12A are depicted in the same manner in Figures 3A and 3B, the dimension reference points 12A provided at multiple locations are provided in a manner that allows them to be distinguished from each other, so that it is possible to determine which location on the body of the dimension reference UAV 12 the dimension reference point 12A shown in the photograph is located at. In addition, the distance between two dimension reference points 12A is accurately measured in advance, and a pair of two dimension reference points 12A constitutes a dimension reference portion that serves as a dimensional reference. Since the dimension reference UAV 12 has multiple dimension reference points 12A, it has at least one dimension reference portion. The control unit 50 adjusts the shooting position of the photographing UAV 14 and causes the photographing means 14A to take photographs at two or more different shooting positions so that at least two photographs are included in which the two dimensional reference points 12A (i.e., dimensional reference portions) are captured together with the support portion 80, which is the object to be measured.

[0049] The photographing UAV 14 is a UAV equipped with a photographing means 14A, and photographs the support portion 80, which is the measurement target. Furthermore, during the photographing, at least two photographs are taken from two or more different photographing positions, capturing both the support portion 80, which is the measurement target, and the dimensional reference portions (two dimensional reference points 12A) provided on the dimension reference UAV 12. Specifically, for example, a digital camera can be used as the photographing means 14A. The photographing UAV 14 can be repositioned as needed, allowing photographs to be taken at an appropriate photographing distance according to the camera's capabilities. Furthermore, the dimension reference UAV 12 is equipped with a light source (not shown), such as a constant light source or flash, which can be used as needed when taking photographs.

[0050] In this first embodiment, the photographing UAV 14 receives instructions via an electrical signal from the control unit 50 to fly, approach the support 80, the measurement target, and position itself in a photographable area where photographs of the support 80 can be taken. Then, upon further instructions via an electrical signal from the control unit 50, the photographing UAV 14 takes photographs of the measurement target, the support 80, using the onboard photographing means 14A. The photographs are taken from two or more different photographing positions within the photographable area so that at least two photographs include the two dimension reference points 12A (i.e., dimension reference portions) provided on the dimension reference UAV 12 together with the measurement target, the support 80. It is also preferable to take multiple photographs (three or more photographs) from multiple directions. By importing and analyzing the data of the multiple photographs taken from multiple directions into the computer 16, it is possible to correct for lens distortions of the photographing means 14A, improving the accuracy of the created three-dimensional model and the calculated dimensions of the support 80.

[0051] The photographic data taken by the photographic UAV 14 is stored in the built-in recording unit 14B. After the photographic UAV 14 is recovered, the photographic data stored in the recording unit 14B is imported into the analysis computer 16. Before the photographic UAV 14 is recovered, the photographic data may be imported into the analysis computer 16 wirelessly using a communication means (not shown) provided in the photographic UAV 14.

[0052] The computer 16 is a computer that analyzes the data of photographs taken by the photographing UAV 14, and has a three-dimensional model construction unit 16A and a dimension calculation unit 16B.

[0053] The 3D model construction unit 16A of the computer 16 uses the imported photographic data to calculate data on the position coordinates of each point on the outer shape of the measurement object (the support 80 in this first embodiment). The 3D model construction unit 16A references the distance data between the two dimension reference points 12A to calculate data on the position coordinates of each point on the outer shape of the measurement object, thereby linking the position coordinates of each point on the outer shape of the measurement object to the actual dimensions. Based on the position coordinates of each point on the outer shape of the measurement object calculated by the 3D model construction unit 16A, the outer shape of the measurement object can be reproduced, and the outer shape of the measurement object can also be displayed on a display, for example. However, since the purpose of the dimension measurement system 10 according to this first embodiment can be achieved as long as the dimensions of the necessary parts of the measurement object (the support 80 in this first embodiment) can be calculated with the necessary accuracy, the calculation process may be completed by calculating the position coordinates of the outer shape of a sufficient number of measurement objects to calculate the dimensions of the necessary parts of the measurement object with the necessary accuracy. In other words, it is not necessarily necessary to calculate the position coordinates of all points on the entire outer shape of the measurement object.

[0054] The dimension calculation unit 16B of the computer 16 calculates the dimensions of necessary parts of the measurement object based on the position coordinates of the outer shape of the measurement object (the support part 80 in this first embodiment) calculated by the three-dimensional model construction unit 16A, and stores the dimensions in a recording unit (not shown) of the computer 16. Furthermore, the calculation results of the dimensions may be configured to be displayed on a display (not shown).

[0055] In the first embodiment, the photographing UAV 14 approaches the bearing 80, which is the measurement target, and takes a photograph of the bearing 80 from a close position. Therefore, the photographed photograph data is highly accurate data about the outer shape of the bearing 80. The computer 16 analyzes this highly accurate data to calculate the dimensions of the bearing 80, so the dimensions of the bearing 80 calculated by the dimension measurement system 10 according to the first embodiment are highly accurate. Furthermore, as described above, by inputting data from numerous photographs taken from multiple directions into the computer 16 and analyzing them, it is possible to correct for lens distortions of the photographing means 14A, etc., thereby improving the accuracy of the created three-dimensional model and further improving the accuracy of the calculated dimensions of the bearing 80.

[0056] (1-2) Embodiments of the Dimension Measurement Method The dimension measurement method according to the first embodiment of the present invention is a dimension measurement method that can be suitably implemented using the dimension measurement system 10 described above. Hereinafter, the dimension measurement method according to the first embodiment of the present invention will be described with reference to the flowchart in Figure 4 (a flowchart showing the steps of the dimension measurement method according to the first embodiment of the present invention). Here, the description will be made with the case in mind where the dimension measurement is performed on a bearing portion 80 including a bearing installed on the top end of a pier 102 of a bridge 100.

[0057] (Step S1) A dimension reference UAV 12 equipped with dimension reference portions (at least two dimension reference points 12A) that serve as dimension references is flown and landed at a location near the measurement target (bearing 80). Specifically, the UAV is landed at a location on the top of the pier 102 of the bridge 100, near the measurement target bearing 80, and that is likely to appear in the same photograph as the bearing 80.

[0058] (Step S2) After the dimension reference UAV 12 is landed at a location near the object to be measured (support portion 80) in step S1, the photographing UAV 14 is flown close to the support portion 80 and placed in a photographable area where photographs of the support portion 80 can be taken.

[0059] (Step S3) In step S2, the photographing UAV 14 is placed in a photographable area where photographs of the measurement object (support portion 80) can be taken. The photographing UAV 14 then photographs the support portion 80 using the photographing means 14A. At this time, photographs are taken at two or more different photographing positions within the photographable area so that at least two photographs are included that capture both the support portion 80 and the dimension reference portion of the dimension reference UAV 12. Furthermore, numerous photographs (three or more photographs) are taken while changing the photographing position horizontally and vertically at an overlap ratio that allows the photographs to be stitched together. Specifically, for example, numerous photographs are taken at a certain height while changing the position horizontally around the measurement object (support portion 80) so that the overlap ratio is approximately 80% or more. Next, the position is changed vertically so that the overlap ratio is approximately 80% or more. At that height, numerous photographs are taken while changing the position horizontally around the support portion 80 so that the overlap ratio is approximately 80% or more. Specifically, for example, a large number of photographs are taken around the measurement object (support portion 80) while changing its position in the height direction within the same vertical plane so that the overlap ratio is about 80% or more, then the position is changed in the horizontal direction so that the overlap ratio is about 80% or more, and a large number of photographs are taken around the measurement object (support portion 80) while changing its position in the height direction within the same vertical plane including that position so that the overlap ratio is about 80% or more. Note that the purpose of this step S3 is to take enough photographs to calculate the dimensions of the necessary parts of the measurement object with the necessary accuracy, so it is sufficient to have the photographing UAV 14 take photographs so that this purpose can be achieved.

[0060] (Step S4) After the photographing in step S3 is completed, the photographing UAV 14 and the dimension reference UAV 12 are recovered.

[0061] (Step S5) The photographic data stored in the recording unit 14B of the recovered photographic UAV 14 is imported into the analysis computer 16. Note that the photographic data may be imported into the analysis computer 16 wirelessly using a communication means (not shown) provided in the photographic UAV 14. In this case, the photographic data taken at approximately the same time as the photographing in step S3 can be imported into the analysis computer 16.

[0062] (Step S6) Using the photographic data imported into the analysis computer 16, the three-dimensional model construction unit 16A of the computer 16 calculates data on the position coordinates of each point on the outline of the measurement object (the support portion 80). The three-dimensional model construction unit 16A refers to the distance data between the two dimension reference points 12A and calculates data on the position coordinates of each point on the outline of the support portion 80, thereby linking the position coordinates of each point on the outline of the support portion 80 to the actual dimensions.

[0063] (Step S7) Based on the position coordinates of the outer shape of the measurement object (support portion 80) calculated by the three-dimensional model construction portion 16A in step S6, the dimension calculation portion 16B of the computer 16 calculates the dimensions of necessary portions of the support portion 80 and stores them in a recording portion (not shown) of the computer 16. Furthermore, the calculation results of the dimensions may be displayed on a display (not shown).

[0064] (1-3) Embodiment of the Construction Setup Method The construction setup method according to the first embodiment of the present invention is a construction setup method that uses the dimension measurement method according to the first embodiment of the present invention described above. Here, the explanation will be given with reference to Figure 5 (a flowchart showing the steps of the construction setup method according to the first embodiment of the present invention), with the case of bridge construction being carried out in which the current dimensions of the bearing part 80, including the bearing installed on the top end of the pier 102 of the bridge 100, are required as a design premise.

[0065] Because the construction setup method according to the first embodiment of the present invention is a construction setup method that uses the dimension measurement method according to the first embodiment of the present invention described above, even in the case of bridge construction where the current dimensions of the bearing part 80 are required as a design premise, after receiving an order for construction (step S11), the work of measuring the dimensions of the bearing part 80 (step S14) begins without waiting for the installation of scaffolding that allows access to the bearing part 80 in the scaffolding installation process (scaffolding installation consultation (step S12) and scaffolding installation work (step S13)), and once the measurement work is completed, design work begins (step S15) and is carried out (step S16). The scaffolding installation process (steps S12, S13) proceeds in parallel with the dimension measurement work (step S14) and the design process (steps S15, S16). The scaffolding here is necessary for transporting and installing materials for carrying out the construction work, and in the construction planning method according to the first embodiment of the present invention, the waiting period during which design work cannot begin after the construction order is received (step S11) is about one month, which is the period required for measuring the dimensions of the support part 80 (step S14).

[0066] On the other hand, as described above in the section entitled "Background Art" with reference to the flowchart in Figure 6, in the past, in the case of bridge construction work in which the current dimensions of the bearing part 80 were required as a premise for design, after the construction order was received (step S101), it was necessary to install scaffolding (scaffolding that allows the dimensions of the bearing part 80 to be measured visually) that allows access to the bearing part 80 through a scaffolding installation process (scaffolding installation consultation (step S102) and scaffolding installation work (step S103)) before carrying out the work of measuring the dimensions of the bearing part 80 (step S104). As a result, there was a waiting period of about two to three months, which was the period required for the scaffolding installation process (scaffolding installation consultation (step S102) and scaffolding installation work (step S103)) and the work of measuring the dimensions (step S104), during which design work could not begin.

[0067] Therefore, in the case of bridge construction where the current dimensions of the support portion 80 are required as a design premise, by using the construction setup method according to the first embodiment of the present invention, the scaffolding installation process required for dimension measurement is unnecessary, and the waiting period from receipt of the construction order until the start of design work can be shortened by about 1 to 2 months compared to the conventional method. Furthermore, the period required for the scaffolding installation process (scaffolding installation consultation (step S12) and scaffolding installation work (step S13)) is usually 1 to 2 months, which is shorter than the period required for the design work (step S16). Therefore, in the conventional method, there is no waiting period for the scaffolding installation to be completed after the design work (step S16) is completed, and the period from receipt of the construction order to the completion of the bridge construction (step S17) can also be shortened by about 1 to 2 months compared to the conventional method.

[0068] (1-4) Supplementary Notes on the First Embodiment In the first embodiment described above, a pair of two dimension reference points 12A constitutes a dimension reference portion that serves as a dimension reference. However, the dimension reference portion is not limited to this configuration. For example, a long plate-shaped member (e.g., a plate-shaped member having a shape commonly used as a ruler) whose length has been measured in advance can also be used as the dimension reference portion. Furthermore, the length of the components themselves that constitute the UAV can be measured in advance and used as the dimension reference portion. Furthermore, the three-dimensional shape of the UAV body can be accurately determined by 3D scanning or the like, and this data can be used as the dimension reference portion. In this case, if a portion of the UAV body is captured in a photograph at a certain size or larger, the captured portion can be used as the dimension reference portion.

[0069] In addition, in the first embodiment described above, the principle is to photograph the support portion 80, which is the measurement object, and the dimensional reference portion (two dimensional reference points 12A) provided on the dimension reference UAV 12 so that they appear in the same photograph. However, depending on the situation at the site, it may be difficult to photograph the support portion 80 and the dimensional reference portion (two dimensional reference points 12A) so that they appear in the same photograph. In such a case, the support portion 80, which is the measurement object, and the dimensional reference portion (two dimensional reference points 12A) may be photographed separately, and the photographs of the support portion 80 and the dimensional reference portion taken separately may be photographed so that they can be connected by splicing them together at an overlap rate (specifically, for example, an overlap rate of about 80% or more). In other words, a photograph of the support portion 80 and a photograph of the dimensional reference portion, taken as separate photographs, can be stitched together with a photograph in between with an overlap rate of, for example, 80% or more, to form a single photograph, and the dimensions of the dimensional reference portion can be used as the basis for measuring the dimensions of the support portion 80.

[0070] Since radio waves from the Global Navigation Satellite System (GNSS) are blocked under the bridge girders, the UAV used in this first embodiment is preferably one that is autonomously navigable and equipped with SLAM (Simultaneous Localization and Mapping) functionality. Furthermore, since there are many protrusions near the support 80, the UAV used in this first embodiment is preferably one with a small body so that collision avoidance can be easily achieved.

[0071] (2) Second embodiment In the first embodiment, the dimension reference UAV 12 is landed on the top of the pier 102 of the bridge 100, but the dimension reference UAV 22 used in this second embodiment is equipped with an attachment means 24, and in this second embodiment, instead of landing the dimension reference UAV 22 on the top of the pier 102 (i.e., on the upward surface of the object), as shown in Figures 7 to 11, the dimension reference UAV 22 is attached to the underside of the steel main girder 104, which is the superstructure of the bridge 100 (i.e., the downward surface of the object), or the wall surface of the pier 102 (i.e., the surface extending vertically of the object), and is positioned at a point near the support portion 80, which is the object to be measured.

[0072] In the following description of the second embodiment, in principle, the differences from the first embodiment described in the previous paragraph and matters related to those differences will be explained, and for all other points, the explanation of the first embodiment will be substituted for the explanation of this second embodiment.

[0073] 8, 10, and 11, the dimension reference UAV 22 used in this second embodiment is equipped with aerial transportation means 22A, the dimension reference UAV 26 used in this second embodiment is equipped with aerial transportation means 26A, and further, the dimension reference UAVs 22, 26 are each equipped with attachment means 24. The dimension reference UAVs 22, 26 can be transported in the air, such as by flying, by the aerial transportation means 22A, 26A.

[0074] 7 is a schematic diagram showing an example of the implementation of the second embodiment, and shows a state in which the dimension reference UAV 22 is attached to the web side of the steel cross girder 106 connecting the steel main girders 104 by the attachment means 24 (see FIG. 8) and is in a stationary state, and the photographing UAV 14 is photographing the support portion 80, which is the measurement target. FIG. 8 is an enlarged schematic diagram (an enlarged schematic diagram of a portion of FIG. 7) showing an example of the implementation of the second embodiment, and shows a state in which the dimension reference UAV 22 is attached to the web side of the steel cross girder 106 by the attachment means 24 and is positioned.

[0075] As shown in Figures 7 and 8, when the dimension reference UAV 22 is attached to the web side of the steel cross beam 106 using an attachment means 24, the attachment means 24 can be, for example, a magnetic attachment means using the magnetic force of a magnet or a vacuum suction means using the adhesive force of vacuum suction.The dimension reference UAV 22 can be attached to the web side of the steel cross beam 106 using the adhesive force of the attachment means 24 (for example, the magnetic force of a magnet or the adhesive force of vacuum suction), and the dimension reference UAV 22 can be positioned in a stationary state at a point near the support portion 80, which is the object to be measured.

[0076] Figure 9 is a schematic diagram showing an example of the implementation status of this second embodiment, and shows a situation in which the dimension reference UAV 22 is attached to the side of the pier 102 by the attachment means 24 (see Figure 10) and is in a stationary state, and the photographing UAV 14 is photographing the support portion 80, which is the measurement target. Figure 10 is an enlarged schematic diagram (an enlarged schematic diagram of a portion of Figure 9) showing an example of the implementation status of this second embodiment, and shows a state in which the dimension reference UAV 22 is attached to the side of the pier 102 by the attachment means 24 and is positioned.

[0077] If the pier 102 is a steel pier, when attaching the dimension reference UAV 22 to the side of the pier 102 using an attachment means 24, the attachment means 24 can be, for example, a magnetic attachment means using the magnetic force of a magnet or a vacuum suction means using the suction force of vacuum suction, and the dimension reference UAV 22 can be attached to the side of the pier 102 using the attachment force of the attachment means 24 (for example, the magnetic force of a magnet or the suction force of vacuum suction), and the dimension reference UAV 22 can be placed in a stationary state at a point near the support part 80, which is the object to be measured.

[0078] If the pier 102 is a concrete pier, when attaching the dimension reference UAV 22 to the side of the pier 102 with the attachment means 24, it is not possible to use magnetic attachment means using the magnetic force of a magnet as the attachment means 24, so a vacuum suction means using the suction force of vacuum suction, for example, is used as the attachment means 24. Even if the pier 102 is a concrete pier, by using vacuum suction means as the attachment means 24, the dimension reference UAV 22 can be attached to the side of the pier 102 using the suction force of the vacuum suction means, and the dimension reference UAV 22 can be positioned in a stationary state at a point near the support part 80, which is the object to be measured.

[0079] When a vacuum suction means is used as the attachment means 24, the dimension reference UAV 22 can be attached to the side of the pier 102 using the attachment means 24, regardless of whether the pier 102 is a steel pier or a concrete pier, and the dimension reference UAV 22 can be positioned in a stationary state at a point near the support part 80, which is the object to be measured.

[0080] Figure 11 is an enlarged schematic diagram showing an example of the implementation status of this second embodiment, and is an enlarged schematic diagram showing the state in which a dimensional reference UAV 26 is attached to the underside of the lower flange of the steel main girder 104 using an attachment means 24 and is stationary.

[0081] As shown in Figure 11, when the dimension reference UAV 26 is attached to the underside of the lower flange of the steel main girder 104 using an attachment means 24, the attachment means 24 can be, for example, a magnetic attachment means using the magnetic force of a magnet or a vacuum suction means using the suction force of vacuum suction.The dimension reference UAV 26 can be attached to the underside of the lower flange of the steel main girder 104 using the attachment force of the attachment means 24 (for example, the magnetic force of a magnet or the suction force of vacuum suction), and the dimension reference UAV 26 can be positioned in a stationary state at a point near the support portion 80, which is the object to be measured.

[0082] In addition, in cases where the adhesive force provided by the attachment means 24 cannot be expected to be sufficient (for example, when the surface of the attachment point provided by the attachment means 24 is uneven), the buoyancy provided by the aerial movement means 22A, 26A may be used in combination to compensate for the lack of adhesive force provided by the attachment means 24.

[0083] (3) Third embodiment In the first embodiment, the dimension reference UAV 12 lands on the top of the pier 102 of the bridge 100, and in the second embodiment, the dimension reference UAVs 22, 26 are attached by attachment means 24 to the underside of the steel main girder 104, which is the superstructure of the bridge 100 (i.e., the downward-facing surface of the object), or the wall surface of the pier 102, which is the substructure of the bridge 100 (i.e., the surface extending vertically of the object), and the dimension reference UAVs 22, 26 are positioned at a point near the bearing part 80, which is the object to be measured. However, in the third embodiment, as shown in Figure 12, the dimension reference UAV 30 is placed at a point near the bearing part 80, which is the object to be measured, while being suspended in the air by hovering using an aerial moving means 30A.

[0084] In the following explanation of the third embodiment, in principle, differences from the first and second embodiments described in the previous paragraph and matters related to those differences will be explained, and for other points, the explanation of the third embodiment will be substituted by the explanation of the first or second embodiment.

[0085] Figure 12 is a schematic diagram showing an example of the implementation status of this third embodiment, in which the dimension reference UAV 30 is hovering in the air and placed in a stationary position near the support part 80, which is the object to be measured, and the photographing UAV 14 is photographing the support part 80, which is the object to be measured.

[0086] The dimensional reference UAV 30 used in this third embodiment has extremely excellent hovering performance using the aerial mobile means 30A, and as shown in Figure 12, it can be placed in a stationary state near the support part 80, which is the object to be measured, while floating in the air by hovering.

[0087] (4) Movement modes of movable bodies that can be employed in the present invention In the first to third embodiments described above, the dimension reference UAVs 12, 22, 26, 30 and the photographing UAV 14 move through the air, but in the present invention, the movement mode of movable bodies equipped with dimension reference parts that serve as dimensional references is not limited to movement through the air. For example, an autonomous vehicle or robot that can move along wall surfaces, etc., can be equipped with dimension reference parts and used in place of the dimension reference UAVs 12, 22, 26, 30. Furthermore, in the present invention, the movement mode of movable bodies equipped with photographing means is not limited to movement through the air. For example, an autonomous vehicle or robot that can move along wall surfaces, etc., can be equipped with photographing means and used in place of the photographing UAV 14.

[0088] (5) Application of the Present Invention to Structures Other Than Bridges The above description of the first to third embodiments focuses on measuring the dimensions of bridge supports, but the application of the dimensional measurement method of the present invention is not limited to bridge supports. The present invention can be used to measure the dimensions of each part and each component of an object, including a wide range of structures. It can also be used to measure the dimensions of each part and each component of not only land-based structures but also water-based structures. The present invention can also be used to measure the dimensions of each part and each component of an object before it is placed at a predetermined location. For example, it can be used to measure the dimensions of each part and each component of a structure in the process of being manufactured at a factory or a completed structure at a factory before it is placed at a predetermined location (specifically, for example, the structures discussed in Sections 5-1, 5-2, and 5-3 below before it is placed at a predetermined location).

[0089] Examples of structures installed in water areas to which the present invention can be applied for dimensional measurement include structures related to offshore wind power generation and marine structures with truss structures. The present invention can also be used to measure the dimensions of each part of these structures. Examples of these structures are specifically described in the following sections 5-1, 5-2, and 5-3.

[0090] 5-1) Structures Related to Bottom-Fixed Offshore Wind Power Generation Bottom-fixed offshore wind power generation refers to power generation using wind turbines in which a support structure fixed to the ground, such as the seabed, is exposed to hydrodynamic loads, or power generation using a system in which wind turbines and control / monitoring devices are directly installed in bodies of water such as the sea, lakes, or rivers. The present invention can be used to measure the dimensions of each part of a structure related to bottom-fixed offshore wind power generation (hereinafter sometimes referred to as a bottom-fixed offshore wind power generation structure). An example of a bottom-fixed offshore wind power generation structure is a bottom-fixed offshore wind power generation structure equipped with a jacket-type foundation structure with a truss structure.

[0091] 5-2) Structures related to floating offshore wind power generation Floating offshore wind power generation is power generation using wind turbines with floating structures supported by position-keeping equipment that are subjected to hydrodynamic loads, vertical holding forces due to the buoyancy of the structure, and horizontal forces induced by waves, currents, wind, etc. The present invention can be used to measure the dimensions of each part of structures related to floating offshore wind power generation.

[0092] Structures related to floating offshore wind power generation (hereinafter sometimes referred to as floating offshore wind power generation structures) include those with floats as foundation structures of pontoon (barge) type, semi-submersible type, spar type, and TLP type, but the present invention is applicable to floating offshore wind power generation structures with any type of float.

[0093] Floating offshore wind turbines with pontoon (barge) type floaters are primarily flat-bottomed hulls (called pontoons or barges) with wind turbines mounted on them. These structures are usually moored by catenary moorings, which increases the contact surface with the water surface, thereby increasing stability.

[0094] Semi-submersible floats are an improved version of the pontoon type, submerged to a predetermined draft. The float consists of a buoyancy section and a column section, submerged to avoid the effects of waves. The phase difference between the wave forces acting on each section is utilized to reduce vertical oscillation. Floating offshore wind turbine structures equipped with this type of float are comprised of an upper structure (deck) on which the wind turbine is mounted and a lower structure (legs). Depending on the lower structure, they are classified as footing or lower hull types. Footing types consist of three or four columns supported by braces. Lower hull types, on the other hand, have a ballast tank called the lower hull connected to the bottom of the column. The ballast tank is filled with water and semi-submerged, reducing the impact of waves.

[0095] A spar-type float is a type of float where most of the float is submerged by extending a cylindrical buoy-type float vertically. Buoyancy is anticipated by ensuring a sufficient draft, so the float is stabilized by lowering the center of gravity. An advanced version of the spar type is the Advanced Spar. While conventional spar-type floats require a draft of around 100m, the Advanced Spar type float has an operating draft of around 50m, allowing it to be installed in relatively shallow waters.

[0096] The TLP float is a semi-submerged float connected to the seabed by a tension mooring line, and is moored using the tension generated by forced buoyancy. It is equipped with a mechanism to suppress the heave, roll, and pitch motions of the float.

[0097] 5-3) Offshore Structures Having Truss Structures The present invention can be used to measure the dimensions of various parts of offshore structures having truss structures. A truss structure is a structure in which elongated members are connected in a triangular shape. A typical example of an offshore structure having a truss structure is a jacket-type pier, which is a structure in which a space truss assembled from steel pipes is placed over foundation piles. Furthermore, a typical example of a fixed-bottom offshore structure having a truss structure is an oil drilling rig or a fixed-bottom offshore wind power generation structure equipped with a jacket-type foundation structure as described in 5-1 above. Furthermore, a typical example of a floating offshore structure having a truss structure is an oil drilling rig or a floating offshore wind power generation structure equipped with a semi-submersible floater, among the floating offshore wind power generation structures described in 5-2 above.

[0098] The dimension measurement method, dimension measurement system, and construction setup method of the present invention are a dimension measurement method and dimension measurement system that can measure dimensions without installing scaffolding, even at high altitudes where dimensions cannot be measured visually without installing scaffolding, and a construction setup method that uses the dimension measurement method, and have industrial applicability.

[0099] DESCRIPTION OF SYMBOLS 10...Dimension measurement system 12, 22, 26, 30...Dimensional reference UAV 12A...Dimensional reference point 14...Photographing UAV 14A...Photographing means 14B...Recording unit 16...Computer 16A...3D model construction unit 16B...Dimension calculation unit 22A, 26A, 30A...Aerial moving means 24...Attachment means 50...Control unit 50A...Communication unit 80...Support unit 100...Bridge 102...Bridge pier 104...Steel main girder 106...Steel cross girder

Claims

1. A dimension measurement method for measuring the dimensions of a measurement object, comprising: a first placement step of moving a first movable body having a dimensional portion whose dimensions are at least partially known in advance, and placing it at a location near the measurement object; a second placement step of moving a second movable body equipped with a photographing means, and placing it in a photographable area where photographs of the measurement object can be taken; and a photographing step of taking photographs that include the measurement object and the dimensional portion together as subjects at a first position and a second position different from the first position within the photographable area where the second movable body is placed in the second placement step.

2. A dimension measurement method as described in claim 1, characterized in that the object to be measured is a support part of a bridge structure, and in the first placement step, the first movable body is placed at a point near the support part.

3. A dimension measurement method according to claim 1, characterized in that the first movable body is provided with a light source, and in the photographing step, photographing is performed using the light source.

4. A dimension measurement method for measuring the dimensions of a measurement object, comprising: a first placement step of moving a first movable body having a dimensional portion whose dimensions at least partially are known in advance, and placing it at a location near the measurement object; a second placement step of moving a second movable body equipped with a photographing means, and placing it in a photographable area where photographs of the measurement object can be taken; and a photographing step of taking separate photographs of the dimensional portion and the measurement object as subjects at a first position and a second position different from the first position within the photographable area where the second movable body is placed in the second placement step, and taking photographs at each of the first position and the second position with an overlap rate that allows the photographs of the measurement object and the photograph of the dimensional portion taken as separate photographs to be connected by splicing together the photographs.

5. A dimension measurement method according to claim 4, wherein the overlap ratio is 80% or more.

6. The dimension measurement method according to claim 1, wherein the photographs taken in the photographing step include three or more photographs taken from different points.

7. The dimension measurement method according to claim 1, further comprising: a three-dimensional model construction step of constructing a three-dimensional model of the object to be measured using data of the photograph taken in the photographing step; and a dimension calculation step of calculating the dimensions of the object to be measured based on the three-dimensional model constructed in the three-dimensional model construction step.

8. A dimension measurement method according to any one of claims 1 to 7, characterized in that of the first movable body and the second movable body, at least the first movable body is movable in the air, and in the first placement step, the first movable body is moved in the air and placed at a point near the object to be measured.

9. A dimension measurement method according to claim 8, wherein in the first placement step, the first movable body is moved through the air and landed at a location near the object to be measured.

10. A dimension measurement method as described in claim 8, characterized in that the first movable body is provided with an attachment means capable of attaching to another object, and in the first placement step, the attachment means is attached to the other object and the first movable body is placed at a point near the object to be measured.

11. A dimension measurement method according to claim 10, wherein the attachment means is an attachment means using magnetic force.

12. A dimension measurement method according to claim 10, wherein the adhesion means is an adhesion means using a suction means.

13. A dimension measurement method according to claim 8, wherein in the first placement step, the first movable body is placed at a point near the object to be measured while suspended in the air.

14. A construction planning method comprising: a dimension measurement process for measuring the dimensions of a high-altitude portion of a structure using a dimension measurement method according to any one of claims 1 to 7; a design process for designing the structure based on the dimensions of the high-altitude portion measured in the dimension measurement process; and a scaffolding installation process for installing scaffolding for carrying out construction work, characterized in that the scaffolding installation process is carried out in parallel with the dimension measurement process and the design process.

15. The construction planning method according to claim 14, wherein the structure is a bridge.

16. A construction setup method according to claim 15, wherein the elevated portion whose dimensions are measured in the dimension measurement step is a support portion of the bridge.

17. A construction planning method comprising: a dimension measurement process for measuring the dimensions of high-altitude parts of a structure using the dimension measurement method described in claim 8; a design process for designing the structure based on the dimensions of the high-altitude parts measured in the dimension measurement process; and a scaffolding installation process for installing scaffolding for carrying out construction work, characterized in that the scaffolding installation process is carried out in parallel with the dimension measurement process and the design process.

18. A dimension measurement system for measuring the dimensions of an object to be measured, comprising: a first movable body having a dimensional portion whose dimensions are at least partially known in advance; a second movable body equipped with a photographing means; and a control unit for controlling the operations of the first movable body and the second movable body, wherein the control unit controls the movement of the first movable body so that the first movable body is positioned near the object to be measured, and controls the movement and photographing operations of the second movable body so that photographs are taken at two or more different photographing positions so that at least two photographs include the dimensional portion together with the object to be measured.

19. The dimension measurement system described in claim 18, characterized in that the dimensional portion includes a plurality of dimension reference points that serve as references for dimension measurement, and the plurality of dimension reference points are arranged in a manner that allows them to be distinguished from one another, so that it is possible to determine at which location on the first movable body the dimension reference points shown in the photograph are located.

20. The dimension measurement system described in claim 18, further comprising: a three-dimensional model construction unit that constructs a three-dimensional model of the object to be measured using data about the photograph taken by the second movable body; and a dimension calculation unit that calculates the dimensions of the object to be measured based on the three-dimensional model constructed by the three-dimensional model construction unit.

21. A dimension measurement system as described in any one of claims 18 to 20, characterized in that the measurement object is a bridge support, and the control unit controls the movement of the first movable body so that the first movable body is positioned at a point on the top of a pier of the bridge and near the support.

22. A dimension measurement system as described in any one of claims 18 to 20, characterized in that of the first movable body and the second movable body, at least the first movable body is movable in the air, and the control unit controls the first movable body to move in the air and be positioned at a point near the object to be measured.

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