JP4136650B2 - How to create a sectional view of a building surface - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for creating a sectional view of a surface of a tangible cultural property such as a stone wall.
[0002]
[Prior art]
For tangible cultural properties such as stone walls, it is necessary to accurately grasp the construction position, state of construction, etc. assuming restoration work due to aging.For example, when taking stone walls as an example, patents are required prior to restoration. As described in Document 1, a surface layer cross-sectional view (construction control chart) showing the current state of the stone wall, the position of the tension used after the restoration and during the restoration work, etc. is created.
[0003]
Conventionally, the current situation figure in the above construction control chart is obtained by taking a stereo image of the entire surface of the stone wall and plotting the photographed image to obtain a surface layer cross-sectional shape at a pre-planned cross-section acquisition position (plan cross-section location). It was.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-160579
[Problems to be solved by the invention]
However, the conventional example described above has the following drawbacks. First, since the current sectional view is created by a stereo drawing method, there are many variations in accuracy among drawing operators, and drawing takes time.
[0006]
In the first place, the above construction control chart is created to confirm the surface position of the stone material that constitutes the surface of the stone wall, based on the dimension reference material (ditching) placed at the planned cross-section location. When it is necessary to change the position of the tension during the repair work due to the circumstances, it is very inefficient because it is necessary to perform the plotting work again to find the surface section of the new planned cross section. There is a problem that.
[0007]
Further, in general, coordinates are given to a photographed image or a surface layer sectional view obtained from these images on the assumption that there is a stationary edge where the position of the stone wall does not change with the passage of time. For this reason, if the fixed edge is damaged due to a disaster or the like after being repaired, it cannot be accurately repaired and has a problem as a material storage method.
[0008]
The present invention has been made to eliminate the above drawbacks, and has a high work efficiency and can be used to accurately restore and restore a building even if a disaster occurs. The purpose is to provide a drawing creation method.
[0009]
Another object of the present invention is to provide a method for creating a cross-sectional view of a surface of a stone wall, which can be used to create a tension drawing used for repairing the stone wall.
[0010]
According to the present invention, the object is
A method for creating a cross-sectional view of a building, wherein a surface cross-sectional view of the building is created by laser measurement of the surface of the building to be repaired ,
Prior to the laser measurement, by setting the reflection reference point 1 on the surface of the building to be repaired, the laser data indicating the reflection reference point 1 is used as a reference for the reflection reference point 1 installed on the building surface. Get a set of laser measurement data combined with public coordinates attached by point surveying ,
Next, there is provided a method for creating a surface layer cross-sectional view of a building that creates a surface layer cross-sectional view of a building by calculating a distribution on an arbitrary plane based on position information of each laser data in the laser measurement data group. Is achieved.
[0011]
In the present invention, surface measurements of the repaired buildings, obtained by laser measurement. The output value obtained by laser measurement is a set of point data (laser measurement data group) each having three-dimensional position information obtained from the time from irradiation with the laser beam to reflection from the object. Can be displayed on the three-dimensional coordinates to display surface data over the entire structure to be repaired.
[0012]
Further, since the acquired laser data is acquired by being combined with public coordinates, it indicates position information on the public coordinates. As a result, for example, even if the fixed edge due to a disaster or the ground is damaged, the accurate position at the time of construction can be surely known.
[0013]
In addition, since the measured values of the restoration target building surface are given as a laser measurement data group consisting of direct measured values, it is relatively easy to select a point on an arbitrarily set straight line. it can. Therefore, even if, for example, the position of the tightening is suddenly changed during repair work, the surface layer cross-sectional view can be obtained simply by specifying the straight line position, that is, the planned cross-section position. Is planned.
[0014]
The present invention stores the surface shape as laser data associated with public coordinates, and thus can be stored for a very long period of time, and is suitable for storing the shape of all tangible cultural properties. Application to stone walls where state reproduction is strongly required is useful.
[0015]
in this case,
After setting the mesh in the laser measurement data group,
Calculate the public coordinates of mesh grid 2,
After that, by instructing the vertical depression angle between the adjacent mesh grids 2 and the distance from the predetermined tension position of each mesh grid 2, it can be used as a tension chart at the time of repair work.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Fig. 1 shows the procedure for creating a string drawing used to repair a stone wall. In creating the drawing chart, first, the work reference point 3 is set, and a reference point survey based on public coordinates is performed (procedure 1). This working reference point 3 is installed to connect the reflection reference point 1 to public coordinates through a reflection reference point (measurement reference point 1) on the stone wall, which will be described later, and a public reference point in the vicinity of the stone wall. The public reference point is inspected, and the public coordinates are attached by, for example, traverse surveying from the public reference point.
[0017]
When the installation of the work reference point 3 and the attachment of the public coordinates are completed as described above, the reflection reference point 1 is then installed on the surface of the stone wall (procedure 2). The reflection reference point 1 is provided to position each point data to be described later in the public coordinate space by attaching public coordinates to a predetermined point on the stone wall. After installation, the reflection reference point 1 is reflected from the work reference point 3 to each reflection reference point. 1. Coordinate observation is performed and public coordinates are attached.
[0018]
When the application of the public coordinates to the reflection reference point 1 is completed, in step 3, laser survey using a three-dimensional laser scanner is performed. When acquiring data with a 3D laser scanner, the distance between the scanner body and the stone wall surface affects the data acquisition range and density. It is set in a place where it is possible and there are few obstacles such as trees. Laser surveying is performed by scanning the entire surface of the stone wall while gradually moving the scanning range with respect to the surface of the stone wall. If the height of the stone wall is high enough to cover from the upper end to the lower end with a single scanning, Scanned in multiple courses in the direction. In this case, in order to reduce the difference between the upper and lower courses of the angle at which the stone wall is looked up from the scanner, for example, the scanning in the upper course is preferably performed by mounting the scanner on an aerial work vehicle.
[0019]
If the surface of the stone wall is behind an obstacle such as a power pole and laser data cannot be acquired, the laser data hole acquired along the observation course is moved to a position where the scanner can be observed for supplementary measurement. Add as points and add to the acquired data via public coordinates.
[0020]
The survey result by laser survey is given as a point group (laser measurement data group) in which each point is associated with the distance from the scanner installation position to the stone wall surface. After evaluating each point of these laser data, each data is spatially combined, and all points are positioned in public coordinates. The coordinate-converted data is converted into CAD data to simplify data processing (procedure 4).
[0021]
As shown in FIG. 2 (b), the laser measurement data group is distributed in the form of dots on a thin paper-like surface to which the surface of the stone wall is transferred in the public coordinate space. A surface layer cross section at the planned cross section is created. The laser measurement data group also expresses the presence of recesses at the stone boundaries, but in order to avoid the complexity of illustration, these stone boundary recesses are not shown in FIG.
[0022]
The surface layer cross-sectional view first performs the necessary data processing on the above laser measurement data group, and draws the current state of the stone wall surface by obtaining the coordinates in the mesh grid 2, 2, ... of the mesh set on the surface of the stone wall Obtained as. The size of the mesh is set to, for example, about 1.8 m (1 interval) in consideration of the arrangement pitch of the tension. As described above, the laser measurement data group is a point group arranged in a dotted pattern on the surface corresponding to the surface of the stone wall, and the number of data belonging to a predetermined cross section having no thickness is relatively small. The sectional view assumes a plane having an appropriate thickness, and is subjected to statistical processing on laser data belonging to the plane to obtain measurement data at each position.
[0023]
As shown in FIG. 3, the surface layer cross-sectional view is configured to have a cross-section in the vertical direction (longitudinal cross-sectional view) and contour line data in the horizontal direction (transverse cross-sectional view). In FIG. 3, the upper part is a transverse sectional view and the lower part is a longitudinal sectional view, and the black circles in the figure indicate the mesh grid 2. In this case, the H ₀ line in the cross-sectional view is the basal plane (ground), H ₁ , H ₂ ... Are the contour lines at the heights H ₁ , H ₂ . It can be seen that it has a gently curved shape. The longitudinal section is expressed by connecting the mesh grids 2 and 2 with straight lines when the surface of the stone wall is cut by planes V ₁ , V ₂ ... Perpendicular to the longitudinal direction. It turns out that it is moving gradually in the direction away from the boundary between the basal plane and the stone wall.
[0024]
As mentioned above, the vertical and horizontal cross section obtained here is the shape of the stone wall that has changed over time, that is, the surface cross section showing the current state (procedure 5), and the shape after restoration based on this (the shape at the time of construction) Is determined (procedure 6).
[0025]
The longitudinal sectional view and the transverse sectional view in the surface layer sectional view are associated with each other, and when determining the shape after restoration, for example, the position shown in the longitudinal sectional view is changed to the position assumed at the time of construction. By doing so, it is verified whether the curved shape of the cross-sectional view at the contour position is broken, that is, the parallelism of the contour lines of the repair surface.
[0026]
When the surface layer cross section of the restoration surface is determined as described above (procedure 7), the position of the tightness required for the construction is determined, and the vertical and horizontal cross sections at the position of the tightness are cut out to create the exact drawing. The As shown in FIG. 3, the chartering chart includes a predetermined height from the reference altitude value, for example, the rising angle (θ) of the planned stone wall surface and the distance (L) from the stringer to the planned stone wall surface at every interval. It is done.
[0027]
The stone wall is repaired by once removing the stone material 4 of the stone wall and then setting up the tension on the basis of the above-mentioned drawing and checking the position of each stone material 4 to pile up the stone material 4 again.
[0028]
【The invention's effect】
As is clear from the above description, according to the present invention, a surface layer cross-sectional view of a building that is highly efficient in work and can be used to accurately repair and restore the building even if there is a disaster or the like is obtained. be able to.
[Brief description of the drawings]
FIG. 1 is a flowchart illustrating the present invention.
FIGS. 2A and 2B are diagrams showing a drawing of a stone wall restoration. FIG. 2A is a diagram showing a stone wall, and FIG. 2B is a diagram showing a state in which laser measurement data groups are arranged in a public coordinate space.
FIG. 3 is a diagram showing a stringer drawing for stone wall restoration.
[Explanation of symbols]
1 Measurement reference point 2 Mesh grid 3 Work reference point 4 Stone

Claims (3)

A method for creating a cross-sectional view of a building, wherein a surface cross-sectional view of the building is created by laser measurement of the surface of the building to be repaired ,
Prior to the laser measurement, by setting a reflection reference point on the surface of the building to be repaired, a reference point survey is performed on the reflection reference point set on the building surface via the laser data indicating the reflection reference point. get the laser measurement data group that is coupled to the attached public coordinates,
Next, a method for creating a surface layer cross-sectional view of a building that creates a surface layer cross-sectional view of a building by calculating a distribution on an arbitrary plane based on position information of each laser data in the laser measurement data group. A method for creating a cross-sectional view of a surface of a stone wall, in which the surface of the stone wall is cut by laser measurement and the surface of the stone wall is cut vertically and horizontally,
Prior to the laser measurement, by installing a reflection reference point on the surface of the stone wall, the public coordinates attached by the reference point survey to the reflection reference point installed on the surface of the stone wall via the laser data indicating the reflection reference point Get the laser measurement data group connected to
Then, the surface cross-sectional view of a stone wall to create a surface cross-sectional view of the stone surface in the vertical and horizontal directions by calculating the distribution on any plane based on the position information of the laser data for each in the laser measurement data group How to make. After setting a mesh in the laser measurement data group,
Calculate the public coordinates of the mesh grid,
3. A method for creating a cross-sectional view of a surface of a stone wall according to claim 2, wherein after that, a chord map in which the vertical depression angle between adjacent mesh grids and the distance from a predetermined chord position of each mesh grid is designated is created.

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