Shaft member provisional assembly system and shaft member provisional assembly method

Abstract

To solve the problem included in the prior art, that is, to provide a shaft member temporary assembly system and a shaft member temporary assembly method which can grasp various information for assembling shaft members in advance so that valuable existing shaft members can be effectively utilized.SOLUTION: A shaft member temporary assembly system of the present invention is the system that temporarily assembles a shaft member model by using CAD, and comprises center plane setting means, center line setting means, and shaft member group generating means. The center plane setting means is the means for setting a center plane onto the shaft member model through an operator operation. The center line setting means is the means for setting a center line of the shaft member model by two center planes crossing approximately vertically. The shaft member group generating means is the means for generating a shaft member group that the shaft member model, the center plane and the center line are grouped.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to the restoration of wooden cultural property structures and wooden historical structures (hereinafter collectively referred to as "cultural property wooden structures, etc."), and more specifically to a system that uses a 3D model of the shaft members to perform virtual mock-assembly on CAD, and a method of performing mock-assembly using this system. [Background technology]

[0002] Wooden buildings have been used in Japan since ancient times, and as a result, many wooden buildings, including cultural properties, remain to this day. However, the warm and humid weather conditions make wood susceptible to damage, and severe natural disasters such as earthquakes and typhoons occur frequently, making it a harsh environment for wooden buildings. In particular, because wooden buildings, including cultural properties, have existed for a long time, deterioration is often seen in the roofs, eaves, edges, and under the floors, and if this condition is left unattended, there is a risk that the entire building will be damaged. Therefore, regular repairs and restorations are carried out in order to preserve wooden buildings, including cultural properties, and pass them on to future generations.

[0003] Restoration of wooden cultural properties and other cultural assets differs from repairing regular wooden buildings in that it is necessary to thoroughly research existing materials before carrying out the work, and there are various constraints, such as reusing dismantled wood, reproducing architectural techniques, and making minimal changes to the overall design. For example, the core members that make up wooden cultural properties and other cultural assets, such as the pillars, beams, girders, ridgepole, rafters, purlins, and rafters, are in principle used as they are, and joint techniques such as mortise and tenon joints are also used in the restoration.

[0004] However, wooden buildings such as cultural properties often become uneven or tilted over time, and in these cases, the axis members also become twisted, distorted, or rotten. It is also not uncommon for the axis members to become deformed during storage when they are released from restraints or the load is removed through dismantling. Axes that have become defective in this way are usually reused after the problem areas are repaired or the deformation is corrected.

[0005] Usually, before full-scale "construction" takes place on-site, a "trial assembly" is carried out at a different location. This trial assembly is literally the work of temporarily (trially) assembling the shaft members, and is a kind of trial and error work in which defects in the shaft members are detected and repaired during assembly, and the arrangement of the shaft members (position, posture, etc.) is confirmed. During the trial assembly, decisions may be made, such as whether or not to cut existing shaft members or whether they can be repurposed. However, when making such decisions during the trial assembly, appropriate choices are not always made, and undesirable cases may arise, such as cutting existing shaft members that did not need to be cut, or giving up on using existing shaft members that could be repurposed.

[0006] Therefore, Patent Document 1 proposes a technique for reinforcing traditional wooden frameworks without demolishing existing buildings by eliminating the need for temporary assembly in order to avoid the drawbacks of temporary assembly described above. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2003-301516 A Summary of the Invention [Problem to be solved by the invention]

[0008] If the damage is not severe enough to require dismantling and restoration, the technology disclosed in Patent Document 1 can be used to reinforce wooden buildings such as cultural properties, but if not, temporary assembly is unavoidable. Therefore, the inventors of the present invention have devised a method of virtually performing temporary assembly by using CAD (Computer Aided Design). By assembling the shaft members on a computer in advance, it is possible to check the defects and arrangement of the shaft members in advance, and it is possible to consider in advance whether or not the existing shaft members should be cut or whether they can be repurposed, and it is possible to verify a method of effectively utilizing the valuable existing shaft members while leaving them as much as possible. In other words, it is possible to imagine in advance the parts that are likely to cause defects (are likely to cause interference) so that defects do not occur in the actual temporary assembly, and it is possible to consider in advance on a desk the most desirable combination of the infinite number of combinations of shaft member arrangements (mutual positions, angles, etc.). This makes it possible to compare and consider the case where the interfering parts are cut off and assembled as designed, and the case where they are separated without being cut off.

[0009] Also, when it is difficult to estimate the dimensions of a building due to decay of the foundations, old photographs, the techniques used at the time of construction, and popular designs may be used as reference, but whereas traditional mock-assemblies do not allow for many cases to be tried, virtual mock-assemblies using CAD make it possible to try a variety of cases. Similarly, the placement and scope of axis members may change depending on the point in the history of a wooden building such as a cultural property at which the specifications and shape of the restoration are set, but with virtual mock-assemblies using CAD, it is not difficult to try a variety of cases while setting the desired point in time.

[0010] However, as the inventors of the present invention continued their investigations, they found that there were some problems with the virtual mock-assembly method using CAD. For example, with a simple 3D model of the shaft members, it is extremely difficult to specify (drag) the model on the CAD, it is difficult to determine the reference point for alignment, and it is also difficult to determine the standard for fine-tuning the shaft members that have become twisted or distorted due to aging. Furthermore, because the 3D model of the shaft members is a hollow shape consisting only of the surface, it was found that there were problems such as the inability to check for physical interference, as the joints and connections can be assembled even though they do not fit together.

[0011] The object of the present invention is to solve the problems associated with the conventional technology, namely, to provide a shaft member provisional assembly system and a shaft member provisional assembly method that can grasp various information required for assembling a shaft member in advance so as to make effective use of valuable existing shaft members. [Means for solving the problem]

[0012] This invention was made based on an unprecedented idea, focusing on using CAD to temporarily assemble a three-dimensional model of the shaft member (hereinafter referred to as the "shaft member model") and setting a center plane and center line in the shaft member model.

[0013] The shaft member provisional assembly system of the present invention is a system for provisionally assembling a shaft member model using CAD, and is provided with a center plane setting means, a center line setting means, and a shaft member group generating means. The center plane setting means is a means for setting a center plane (a plane that divides the shaft member model in the axial direction) in the shaft member model by an operator's operation, and the center line setting means is a means for setting a center line of the shaft member model by two center planes that intersect approximately perpendicularly (including perpendicularly). The shaft member group generating means is a means for generating a shaft member group in which the shaft member model, the center plane, and the center line are grouped so that they move together on the CAD. The center plane is displayed transparently, and the shaft member model, the center plane, and the center line are each arranged on a different layer. Then, the center lines and center planes related to two or more shaft member groups are displayed and connected by the operator's operation, and the connection status can be visually confirmed by displaying the shaft member model.

[0014] The shaft member provisional assembly system of the present invention can also set a center plane so as to protrude in the axial and outer circumferential directions of the shaft member model, and can also set a center line so as to protrude beyond the outer edge of the center plane in the axial direction of the shaft member model.

[0015] The shaft member provisional assembly system of the present invention may further include a display color change means for changing the display color of the texture of the shaft member model by an operator's operation. In this case, two or more shaft member models to be joined are displayed in different colors and in three-dimensional (3D) cross sections, allowing visual confirmation of the interference state at the joint.

[0016] The shaft member provisional assembly system of the present invention may further include a reference plane setting means and a shaft member model arrangement means. The reference plane setting means is a means for setting a plane on which two or more shaft member models of the same type are arranged as a reference plane by an operator's operation, and the member model arrangement means is a means for arranging two or more shaft member models designated by the operator on the reference plane. The shaft member models arranged on the reference plane are moved on the reference plane by an operator's operation.

[0017] The shaft member provisional assembly method of the present invention is a method for provisionally assembling a shaft member model using the shaft member provisional assembly system of the present invention, and is a method including a shaft member model acquisition step, a shaft member group generation step, and a provisional assembly model formation step. In the shaft member model acquisition step, a shaft member model is acquired by measuring (scanning) each disassembled shaft member. In the shaft member group generation step, a central plane is set using a central plane setting means to generate a shaft member group, and in the provisional assembly model formation step, a provisional assembly model of the shaft member model is formed while connecting multiple shaft member models on CAD. In the shaft member model connection step, center lines and central planes related to two or more shaft member groups are displayed and connected, and then the connection status can be visually confirmed by displaying the shaft member model.

[0018] The shaft member provisional assembly method of the present invention may further include a model comparison step. In this model comparison step, a "design model" created based on existing design documents is compared with the "provisional assembly model" formed in the shaft member model formation step. In this case, in the model comparison step, when a difference occurs between the provisional assembly model and the design model, the position of the shaft member model is changed and connected to another shaft member model.

[0019] The shaft member provisional assembly method of the present invention can also be a method further comprising a framework model acquisition step and a model comparison step. In the framework model acquisition step, a "framework model" is obtained by 3D modeling the framework state of the shaft member by measuring the existing wooden building before demolition. In the model comparison step, the "temporary assembly model" formed in the shaft member model formation step is compared with the framework model acquired in the framework model acquisition step. In this case, in the model comparison step, when a difference occurs between the provisional assembly model and the framework model, the position of the shaft member model is changed and connected to another shaft member model. Effect of the Invention

[0020] The shaft member provisional assembling system and shaft member provisional assembling method of the present invention have the following advantages. (1) It is possible to predict in advance which parts are likely to cause problems (interference) so that problems do not occur during the actual mock assembly. (2) It is possible to study in advance at a desk the most desirable combination of the infinite number of possible shaft component arrangements (such as mutual positions and angles). (3) It will also be possible to compare what happens when the interfering parts are removed and assembled as designed with what happens when they are separated without being removed. (4) As a result of the above, valuable existing shaft components can be preserved and effectively utilized as much as possible. (5) The structure’s history allows for restoration and comparison at multiple points in time. (6) The shaft component model has a center plane, center line, etc. set, making it easy to handle on CAD. (7) By displaying the models of the shaft components to be joined in three-dimensional (3D) cross sections and in different colors, it is easy to visually confirm the interference conditions at joints that are not visible from the outside. (8) For example, by setting a plane on which rafters with the same slope are placed, the axis members can be placed without any inconsistencies, such as at the joints with the main building. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a block diagram showing the main configuration of a shaft member provisional assembly system according to the present invention. [Diagram 2] FIG. 2 is a flow chart showing the main process flow of the shaft member provisional assembly system. [Diagram 3] 1A is an image diagram capturing the shaft member model and the center plane and center line displayed on a display means, and FIG. 1B is a model diagram showing the shaft member, the center plane and the center line in schematic form. [Figure 4] (a) is a side view showing a schematic of the center plane protruding in the axial and outer circumferential directions of a columnar shaft member model, and (b) is a front view showing a schematic of the center plane protruding in the axial and outer circumferential directions of a columnar shaft member model. [Diagram 5]1(a) is a perspective view showing a traditional Japanese joint called "Koshikake Kamatsugi" before a shaft member model with a convex portion (male part) and a shaft member model with a concave portion (female part) are connected, and 1(b) is a perspective view showing a traditional Japanese joint called "Koshikake Kamatsugi" after a shaft member model with a convex portion and a shaft member model with a concave portion are connected. [Figure 6] (a) is a perspective view showing the schematic arrangement of the purlin (the component that supports the rafters) and the rafters, (b) is a perspective view showing the schematic arrangement of the reference plane that is adjusted to the slope of the rafters, and (c) is a perspective view showing the schematic arrangement of the purlin and the reference plane that is adjusted to the slope of the rafters. [Figure 7] FIG. 4 is a model diagram showing a schematic diagram of the provisional assembly model and the design model superimposed on the display means. [Figure 8] 1 is a flow chart showing main steps of a shaft member provisional assembly method according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] An embodiment of the shaft member provisional assembly system and shaft member provisional assembly method of the present invention will be described with reference to the drawings. The shaft member provisional assembly system and shaft member provisional assembly method of the present invention are particularly suitable for use with wooden structures such as cultural properties, but are not limited to this and can be used with any existing wooden structure. In addition, one of the features of the present invention is the virtual assembly of shaft members, but it can be applied to various types of "roof truss" that have been previously known, such as "Japanese huts" and "Western huts."

[0023] 1.Overview As mentioned above, conventional mock assembly involves dismantling an existing wooden building and attempting to actually assemble "axial members" such as pillars, beams, girders, ridgepole, rafters, purlins, and rafters, after making repairs as necessary. The present invention uses a 3D model (hereinafter referred to as the "axial member model") obtained by measuring (scanning) the dismantled axial members, and performs a virtual mock assembly on CAD (i.e., on a computer). For convenience, the assembly of the axial member model on CAD will be referred to as "virtual mock assembly" here to distinguish it from "temporary assembly" in which the axial members are actually assembled.

[0024] To obtain the individual shaft member models, a commercially available scanner (such as Artec's EVA-M 3D Scanner) can be used. Measurements using this scanner can obtain a point cloud (a group of three-dimensional coordinates) with color elements that represent at least the outer shape of the shaft member. Images (textures) may also be obtained using another optical sensor (such as a digital camera).

[0025] The shaft component model is made by scanning the shaft components after they have been disassembled, but it is also a good idea to scan the shaft components alone before they are completely disassembled (the so-called skeleton state). At this time, it is also a good idea to mark horizontal and vertical marks and attach numbering tags to each shaft component. This makes it possible to obtain a shaft component model that includes information such as horizontal and vertical marks and numbering tags. It is also a good idea to create a 3D model based on existing old documents and blueprints (hereinafter referred to as "existing design documents"). For the sake of convenience, here we will refer to the model obtained by provisionally assembling the shaft component model on CAD (i.e., virtual provisional assembly) as the "provisional assembly model", the model obtained by scanning the skeleton state as the "framework model", and the model created based on existing design documents as the "design model".

[0026] 2. Shaft component temporary assembly system The shaft member provisional assembly system of the present invention will be described in detail. The shaft member provisional assembly method of the present invention is a method for performing a virtual provisional assembly using the shaft member provisional assembly system of the present invention. Therefore, the shaft member provisional assembly system of the present invention will be described first, and then the shaft member provisional assembly method of the present invention will be described.

[0027] 1 is a block diagram showing the main configuration of a shaft member provisional assembly system 100 of the present invention. As shown in this figure, the shaft member provisional assembly system 100 of the present invention is configured to include a center plane setting means 101, a center line setting means 102, and a shaft member group generation means 103, and can also be configured to include a reference plane setting means 104, a shaft member model arrangement means 105, a provisional assembly model formation means 106, a model comparison means 107, a display color change means 108, a design model formation means 109, a framework model formation means 110, a display means 111, a shaft member model storage means 112, a shaft member group storage means 113, a provisional assembly model storage means 114, a design model storage means 115, a framework data storage means 116, and a framework model storage means 117.

[0028] Among the main elements constituting the shaft member provisional assembly system 100, the center plane setting means 101, center line setting means 102, shaft member group generating means 103, reference plane setting means 104, shaft member model arrangement means 105, provisional assembly model forming means 106, model matching means 107, display color changing means 108, design model forming means 109, and framework model forming means 110 can be manufactured as dedicated ones, or a general-purpose computer device and CAD can be used. Specifically, a CAD program causes a computer device to execute each process by the center plane setting means 101 to framework model forming means 110. The computer device is equipped with a processor such as a CPU, a memory such as a ROM or RAM, an input means such as a mouse or a keyboard, and a display, and can be configured by a personal computer (PC), a server, a tablet PC such as an iPad (registered trademark), a mobile terminal including a smartphone, or the like. When a computer device equipped with a display is used, the display may be used as the display means 111.

[0029] In addition, the shaft member model storage means 112, shaft member group storage means 113, temporary assembly model storage means 114, design model storage means 115, framework data storage means 116, and framework model storage means 117 can use a storage device of a general-purpose computer or can be constructed in a database server. When constructed in a database server, they can be placed in a local network (LAN: Local Area Network) or can be a cloud server that stores data via the Internet (i.e., wireless communication).

[0030] Next, the main process flow when using the shaft member provisional assembly system 100 of the present invention will be described with reference to Fig. 2. Fig. 2 is a flow diagram showing the main process flow of the shaft member provisional assembly system 100, with the central column showing the processes to be performed, the left column showing the input information required for those processes, and the right column showing the output information resulting from those processes.

[0031] As shown in Figure 2, first create a design model based on existing design documents. Then, scan the skeleton state before dismantling, and scan each axis component after dismantling. At this time, as mentioned above, it is a good idea to mark horizontal and vertical lines, and attach number tags to each axis component before scanning the skeleton state.

[0032] After each shaft member is disassembled, it is scanned and a shaft member model is generated based on the scanning results (hereinafter referred to as "shaft member data") (Step 101 in FIG. 2). Specifically, a surface model (e.g., TIN: Triangulated Irregular Network) representing the surface of the shaft member is generated based on the shaft member data, and an image (texture) is attached to this surface model. It is preferable that this shaft member model has a data structure that allows the texture to be displayed / hidden (ON / OFF) on CAD. The shaft member model generated here is stored in shaft member model storage means 112 (FIG. 1).

[0033] Once the shaft member model has been generated, the shaft member model is read out from the shaft member model storage means 112 (Fig. 1) and the outer peripheral surface of the shaft member is set (Step 102 in Fig. 2). Specifically, the operator operates the CAD to set each surface of the shaft member model as the outer peripheral surface. For example, for a cylindrical shaft member, six outer peripheral surfaces are set. In addition, once the shaft member model has been generated, the center plane of the shaft member model is also set (Step 103 in Fig. 2). Specifically, the operator uses the center plane setting means 101 (Fig. 1) built into the CAD to set the plane that bisects the shaft member model in the axial direction as the center plane.

[0034] 3 is a diagram showing a schematic diagram of a central plane SC set for a columnar shaft member model EL, where (a) is an image captured from the display on the display means 111 (e.g., a liquid crystal display), and (b) is a model diagram. As shown in this diagram, two central planes SC are set for one shaft member model EL, and these central planes SC are set to intersect approximately perpendicularly (including perpendicularly).

[0035] FIG. 4 is a diagram showing a schematic of the center plane SC protruding in the axial direction and the outer periphery direction of the columnar shaft member model EL, (a) is a side view, and (b) is a front view. Note that a "tenon" is shown in the center of FIG. 4(b). As shown in this figure, each center plane SC has a shape that protrudes in the axial direction and the outer periphery direction of the shaft member model EL, and the operator specifies the setting position of the center plane SC in the shaft member model by operating the CAD, and sets the center plane SC so that it protrudes in the axial direction and the outer periphery direction by a predetermined dimension (length). When the shaft member models EL are assembled, the shaft member models EL are complicatedly intertwined with each other, and it may be difficult to specify (drag) the target shaft member model EL to fine-tune the arrangement, for example. If the center plane SC protrudes in the axial direction and the outer periphery direction of the shaft member model EL, it is easy to drag the center plane SC instead of the shaft member model EL, and if the center plane SC and the shaft member model EL are configured to move together on the CAD as described later, the target shaft member model EL can also be moved by dragging the center plane SC. However, in order to prevent the shaft member model EL from being hidden by the center plane SC, the center plane SC is displayed as a transparent glass surface on the display means 111 (for example, a liquid crystal display).

[0036] When the center plane SC of the two faces intersecting approximately perpendicularly is set, the operator sets the center line SL for the shaft member model EL using the center line setting means 102 (FIG. 1) incorporated in the CAD (Step 104 in FIG. 2). This center line SL is an extension of the line segment where the center planes SC of the two faces intersect, as shown in FIG. 3 and FIG. 4, and is set so as to protrude in the axial direction of the shaft member model EL and to exceed the outer edge of the center plane SC. Then, when the center plane SC and center line SL of the two faces are set, the shaft member group generating means 103 (FIG. 1) generates a "shaft member group GR" in which the shaft member model EL, the center plane SC, and the center line SL are grouped (Step 105 in FIG. 2). The shaft member model EL, the center plane SC, and the center line SL that constitute this shaft member group GR move together on the CAD, that is, when the operator drags the center plane SC, the shaft member model EL and the center line SL also move in the same way. The shaft member group GR generated here is stored in the shaft member group storage means 113 (FIG. 1).

[0037] When shaft member groups GR are generated for all dismantled shaft members, the shaft member groups GR are arranged and connected while referring to the horizontal and vertical marks and numbering tags attached to the shaft members, or the framework model (scanning results in the skeleton state) and design drawings, in other words, a virtual temporary assembly is performed to complete the temporary assembly model (Step 107 in Fig. 2). Specifically, the operator arranges and connects the shaft member groups GR using the temporary assembly model forming means 106 (Fig. 1) incorporated in the CAD. At this time, when a convex portion is formed in one shaft member model EL1 (male part) to be connected and a concave portion is formed in the other shaft member model EL2 (female part) as shown in Fig. 5, the shaft member models EL1 and EL2 are connected so that the convex portion and the concave portion fit together.

[0038] When connecting two or more shaft member groups GR by an operator, it is recommended to connect them while only the center line SL (or the center plane SC and the center line SL) are displayed. When connecting shaft member models EL to each other while visually checking, it is not clear what the reference for connection is, but if the center lines SL are used, the reference for connection is clear and the operation is easy. If the shaft member models EL are displayed while the center lines SL are connected to each other, the connection state between the shaft member models EL (for example, the mating state of the convex and concave parts shown in FIG. 5) can be confirmed, and fine adjustments can be made as appropriate. For this reason, it is recommended to place the shaft member models EL, the center plane SC, and the center line SL on separate layers in the CAD. Note that when placing and connecting the shaft member groups GR, an image may be displayed as a texture on the surface of the shaft member model EL, or the texture may be hidden. Also, a single color may be applied as a texture to the surface of the shaft member model EL, or a pattern prepared in advance (such as a wood pattern) may be applied as a texture.

[0039] Some axial members, such as rafters placed on the main roof or joists placed on the beams, are placed on the same plane. In such cases, it is advisable to set in advance the plane on which the multiple axial members are placed (hereinafter referred to as the "reference plane PL") (Step 106 in Fig. 2). Specifically, the operator sets the reference plane PL using the reference plane setting means 104 (Fig. 1) built into the CAD. Note that multiple reference planes PL can be set at any position depending on the purpose.

[0040] FIG. 6 is a diagram for explaining the reference plane PL on which multiple rafters are arranged, in which (a) is a perspective view showing the arrangement relationship between the purlin and the rafters, (b) is a perspective view showing the arrangement relationship between the purlin and the reference plane PL. For convenience, FIG. 6 shows an example of a "hip-bend rafter" among "rafter trusses", but as described above, other assembly forms such as "Japanese-style hut" and "Western-style hut" can be similarly implemented. As shown in this figure, the reference plane PL is set to a plane on which multiple shaft member models EL (rafters in this case) of the same type are to be arranged. Furthermore, when the operator specifies the shaft member model EL (rafters in this case) to be arranged on the reference plane PL, the shaft member model EL can be made to be movable only on the reference plane PL. In this case, the operator uses the shaft member model arrangement means 105 (FIG. 1) built into the CAD to arrange the specified shaft member model EL on the reference plane PL.

[0041] In the case of Figure 6, even if multiple rafters are placed on the reference plane PL, some of the rafters may interfere with the purlin depending on the orientation (posture) of the purlin. In this case, the operator will suspect the twisting, tilt, or fall of the purlin material, as well as the connection angle at the joints of the purlin material, and will drag the center plane SC or center line SL of the purlin shaft member group GR to rotate the purlin shaft member model EL around its axis or adjust the horizontal and vertical tilt.

[0042] As mentioned above, when a convex part is formed on one shaft member model EL1 (male part) to be connected and a concave part is formed on the other shaft member model EL2 (female part) as shown in FIG. 5, the shaft member model EL1 and the shaft member model EL2 are connected so that the convex part and the concave part fit together. At this time, the operator connects them while checking that the convex part does not interfere with the concave part (Step 108 in FIG. 2). With real materials, if there is a snag during fitting, it is necessary to hammer it in or adjust it by cutting each time, so if the materials are joined as they are, it is not possible to accurately grasp the degree of the gaps in each part. In addition, it is not possible to see the internal gaps after joining. However, with a virtual model, by using the 3D cross section function (a function to display a cross section in 3D) provided by CAD, it is possible to numerically check the interference and separation inside the joint that cannot be seen from the outside of the shaft members after joining, and if there is interference or a gap larger than necessary, it is possible to consider cutting the minimum necessary amount before joining or using measures such as filling wood.

[0043] As shown in Fig. 5, in order to make it easier to check the numerical values ​​of interference and separation at joints and connections, it is advisable to display the two connected shaft member models EL (shaft member model EL1 and shaft member model EL2 in Fig. 5) with textures of different single colors. Specifically, the operator specifies the two shaft member models EL using the display color change means 108 (Fig. 1) built into the CAD, and textures of preset display colors (however different colors) are displayed for each. Then, by displaying the joined shaft member models in three-dimensional cross sections with different display colors, it becomes easy to visually check the interference conditions at joints and connections that cannot be seen from the outside.

[0044] When the temporary assembly model is completed by arranging and connecting each of the shaft member groups GR, that is, by performing a virtual temporary assembly, this temporary assembly model is stored in the temporary assembly model storage means 114 (FIG. 1). If a design model is being created, it is advisable to compare the temporary assembly model MT with the design model MS as shown in FIG. 7 (Step 109 in FIG. 2). The shaft member models EL (shaft member groups GR) of the temporary assembly model MT that differ from the design model MS are detected, and the arrangement of the shaft member models EL is fine-tuned so that they match the design model MS as much as possible. By displaying the design model MS and the temporary assembly model MT in an overlapping manner and comparing them, the relative positional relationship of each shaft member can be confirmed, and the suitability of the design, such as the optimal dimensions of the entire frame (such as the final girder length and height of the building), can be verified. Furthermore, damage to members, repair, and a policy for conversion can be considered. The design model MS is created by the operator operating the design model formation means 109 (FIG. 1) incorporated in the CAD, and the design model MS created here is stored in the design model storage means 115 (FIG. 1).

[0045] Similarly, when scanning the skeleton state before dismantling, it is advisable to compare the provisional assembly model MT with the framework model (Step 109 in FIG. 2). By displaying the framework model and the provisional assembly model MT in an overlapping manner and comparing them, it is possible to verify the deformation caused by the release of constraints on the shaft members after dismantling. In addition, since there are various dismantling and design processes in the actual restoration, it is not always possible to obtain all three models (provisional assembly model, design model, framework model), but it is possible to complement them if the design model MS and provisional assembly model MT are available. In addition, when forming the framework model, the results of scanning the skeleton state before dismantling (hereinafter referred to as "framework data") are read from the framework data storage means 116, and the operator operates the framework model formation means 110 (FIG. 1) incorporated in the CAD to create it. The framework model created here is then stored in the framework model storage means 117 (FIG. 1).

[0046] 3. Temporary assembly method for shaft components Next, the shaft member provisional assembly method of the present invention will be described with reference to Fig. 8. Note that the shaft member provisional assembly method of the present invention is a method of performing a virtual provisional assembly using the shaft member provisional assembly system 100 described up to this point, and therefore, we will avoid explanations that overlap with the contents explained in the shaft member provisional assembly system 100, and will only explain the contents unique to the shaft member provisional assembly method of the present invention. In other words, the contents not described here are the same as those explained in "2. Shaft member provisional assembly system".

[0047] Fig. 8 is a flow diagram showing the main steps of the shaft member temporary assembly method of the present invention. As shown in this figure, first, the structure is put into a skeleton state before being completely disassembled, and then the necessary horizontal and vertical marks are drawn (Step 201 in Fig. 8). Furthermore, in the skeleton state, scanning is performed to obtain skeleton data (Step 202 in Fig. 8), and a skeleton model is formed from this skeleton data using the skeleton model forming means 110 (Fig. 1) (Step 203 in Fig. 8).

[0048] When scanning is performed in a skeleton state, this skeleton state is disassembled to obtain individual shaft members (Step 204 in FIG. 8). Then, shaft member data is obtained by scanning these shaft members individually (Step 205 in FIG. 8), and a shaft member model is generated based on this shaft member data (Step 206 in FIG. 8). When the shaft member model is generated, the operator sets a center plane using the center plane setting means 101 (FIG. 1), the center line setting means 102 (FIG. 1) sets the center line SL, and the shaft member group generation means 103 (FIG. 1) generates a shaft member group GR (Step 207 in FIG. 8).

[0049] When shaft member groups GR are generated for all dismantled shaft members, the shaft member groups GR are arranged and connected while referring to the horizontal and vertical marks and numbering tags attached to the shaft members, or the framework model and design drawings, i.e., a virtual temporary assembly is performed (Step 208 in Fig. 8). At this time, the operator can use the reference plane setting means 104 (Fig. 1) and the shaft member model arrangement means 105 (Fig. 1) to set the reference plane PL and arrange the specified shaft member models EL on the reference plane PL. The operator can also use the display color changing means 108 (Fig. 1) to display the two connected shaft member models EL with different single-color textures, and visually check the interference status at the joints such as the convex and concave parts (Step 209 in Fig. 8).

[0050] Once the temporary assembly model MT has been provisionally completed by arranging and connecting each of the shaft member groups GR, the temporary assembly model MT is compared with the design model MS, and the temporary assembly model MT with the framework model (Step 210 in FIG. 8). Then, shaft member models EL (shaft member groups GR) of the temporary assembly model MT that differ from the design model MS and the framework model are detected, and the arrangement of the shaft member models EL is fine-tuned so that they match the design model MS and the framework model as closely as possible. This makes it possible to consider damage to members, and policies for repair and repurposing. By carrying out the series of steps described up to this point, the temporary assembly model MT is completed (Step 211 in FIG. 8), and this temporary assembly model MT is stored in the temporary assembly model storage means 114 (FIG. 1). [Industrial Applicability]

[0051] The shaft member provisional assembly system and shaft member provisional assembly method of the present invention can be used for wooden cultural property structures and historical wooden structures. Considering that the present invention can maintain cultural properties and the like in an appropriate state and pass them on to future generations, it can be said that the invention is not only applicable industrially but also has the potential to make a significant contribution to society. [Explanation of symbols]

[0052] 100 Shaft member provisional assembly system of the present invention 101 (shaft member provisional assembly system) center plane setting means 102 (shaft member provisional assembly system) center line setting means 103 (shaft member temporary assembly system) shaft member group generation means 104 (Shaft member provisional assembly system) Reference plane setting means 105 (shaft member temporary assembly system) shaft member model arrangement means 106 (shaft member temporary assembly system) temporary assembly model forming means 107 (Shaft member temporary assembly system) model verification means 108 (Shaft member temporary assembly system) display color change means 109 (Shaft member provisional assembly system) design model formation means 110 (shaft member temporary assembly system) frame model forming means 111 (Shaft member provisional assembly system) display means 112 (shaft member provisional assembly system) shaft member model storage means 113 (shaft member temporary assembly system) shaft member group storage means 114 (shaft member temporary assembly system) temporary assembly model storage means 115 (Shaft member provisional assembly system) design model storage means 116 (Shaft member temporary assembly system) frame data storage means 117 (Shaft member provisional assembly system) frame model storage means EL shaft member model GR Shaft member group MS Design Model MT mock-up model PL reference plane SC center plane SL center line

Claims

1. A system for performing a temporary assembly using a shaft member model, which is a three-dimensional model of a shaft member obtained by dismantling an existing wooden building, using CAD, a center plane setting means for setting a center plane that divides the shaft member model in an axial direction in accordance with an operator's operation; a center line setting means for setting a center line of the shaft member model by the two center planes intersecting perpendicularly or approximately perpendicularly; a shaft member group generating means for generating a shaft member group in which the shaft member model, the center surface and the center line are grouped so as to move together on a CAD system; The central surface is displayed in a transparent manner. the shaft member model, the center surface, and the center line are arranged on separate layers, The center lines and / or center planes relating to two or more of the shaft member groups are displayed and connected by an operator operation, and the shaft member model is displayed after the connection, so that the connection status can be visually confirmed. A shaft member provisional assembly system characterized by the above.

2. the center plane setting means sets the center plane so as to protrude in an axial direction and an outer circumferential direction of the shaft member model; the center line setting means sets the center line so as to protrude beyond an outer edge of a center surface in an axial direction of the shaft member model.

2. The shaft member provisional assembly system according to claim 1.

3. a display color changing means for changing a display color of the texture of the shaft member model by an operator operation, By displaying the two or more shaft member models to be joined in different colors and in three-dimensional cross sections, it is possible to visually confirm the interference state at the joint.

3. The shaft member provisional assembly system according to claim 1 or 2.

4. a reference plane setting means for setting, as a reference plane, a plane on which two or more of the same types of shaft member models are arranged, by an operator operation; and a shaft member model arrangement means for arranging two or more shaft member models designated by an operator on the reference plane, the shaft member model arranged on the reference plane is moved on the reference plane by an operator operation; 4. The shaft member provisional assembly system according to claim 1, wherein the shaft member provisional assembly system is a shaft member provisional assembly system.

5. A method for provisionally assembling a shaft member model using the shaft member provisional assembly system according to any one of claims 1 to 4, comprising: a shaft member model acquisition step of acquiring the shaft member model by measuring each disassembled shaft member; a shaft member group generating step of generating the shaft member group by setting the center plane using the center plane setting means; a temporary assembly model forming step of forming a temporary assembly model of the shaft member models while connecting the plurality of shaft member models on a CAD system, In the temporary assembly model forming step, the center lines and / or the center planes relating to two or more of the shaft member groups are displayed and connected, and after the connection, the shaft member model is displayed to visually confirm the connection status. A shaft member provisional assembly method comprising the steps of:

6. A model collation process is further provided in which a design model created based on existing design documents is compared with the temporary assembly model formed in the temporary assembly model forming process, When a difference occurs between the provisional assembly model and the design model in the model comparison step, the position of the shaft member model is changed and the shaft member model is connected to another shaft member model.

6. The shaft member provisional assembling method according to claim 5.

7. A framework model acquisition process for acquiring a framework model that is a three-dimensional model of the framework state of a shaft member by measuring an existing wooden structure before demolition; A model matching process is further provided in which the temporary assembly model formed in the temporary assembly model forming process is compared with the skeleton model acquired in the skeleton model acquiring process, When a difference occurs between the provisional assembly model and the framework model in the model matching step, the position of the shaft member model is changed and the shaft member model is connected to another shaft member model.

6. The shaft member provisional assembling method according to claim 5.

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