JPH0217049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for confirming the cutting position of a structure using radiographic transmission.

In structures such as concrete and wood, when a new opening is provided in a wall, for example, buried objects often exist within the wall.

Therefore, it is necessary to confirm the location of the buried objects using the design drawings of the structure, but in reality, the drawings may have been lost or the locations of the buried objects may not always match the drawings. In most cases, it is not.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for confirming the cutting position of a structure in the above-mentioned case, by which the state of the buried object can be confirmed by transmitting radiation and the cutting line can be finely adjusted.

Next, examples of the present invention will be described.

Here, in order to understand the principle of the present invention, we will explain the simplest construction, in which a vertical cutting line is cut into the target wall.

(b) Installation of marker strips, films, and radiation sources (1st to
(Figure 3) First, on one side of wall A, mark the cutting line 1 of the part to be cut, which is determined from a blueprint or the like.

At this time, the exact location of buried objects such as reinforcing bars has not been confirmed.

A marker band 2 having a constant width and made of a material such as lead whose radiation absorption rate is different from that of a structure such as a wall is placed on a marked cutting line 1.

This marker band 2 does not necessarily have to be a single continuous wire, and a method of arranging short pieces of lead or the like in a broken line shape on the cutting line 1 as shown in FIG. 5 is also conceivable.

At this time, the width of the marker band 2 is set to be approximately equal to the width of the cutting tool, that is, the thickness of a diamond cutter or the like.

On the other hand, on the back surface of the wall A, that is, on the side where the marker band 2 is not installed, a radiation sensing film, in this embodiment, an X-ray film 3 is arranged.

Further, a radiation source 4, for example, an X-ray source 4, is installed at a point on a plane extending perpendicularly to the surface of the wall A from the center line 11 of the cutting line 1, facing the cutting line 1.

(b) X-ray irradiation and judgment As shown in Figure 2, when there is a buried object B that falls along cutting line 1 in wall A and a buried object C that does not fall along cutting line 1, X-ray irradiation from X-ray source 4 When irradiated with , the image shown in FIG. 3 is obtained on the film 3.

That is, B' is an image of buried object B, 2' is an image of marker band 2, and C' is an image of buried object C.

Here, the fact that there is an overlapping part like 2' and B' means that part of the buried object B is overlapping the extension of cutting line 1, or even if it is not there, the distance between the two is quite close. means.

On the other hand, the fact that there is no overlap like C' and 2' not only means that cutting line 1 does not overlap buried object C, but also means that there is sufficient space between cutting line 1 and buried object C. means.

In this case, there is no problem in cutting along the marked cutting line 1.

On the other hand, when an overlapping portion occurs as described above, the cutting position must be moved, and the next lesson is how to set the movement width.

Here, the numerical value of this movement width can also be determined using a mathematical formula.

However, by considering the following, you can proceed with your work more efficiently.

In other words, the images of the marker zone and the buried object taken on the film 3 are the respective shadows magnified by the X-rays spread radially from the X-ray source 4.

Therefore, the width of the overlapped portion imaged on film 3
S' is always wider than the actual overlapping width S.

Therefore, if the cutting line 1 is moved by the width S' of the overlapping part on the film 3, it will have been moved somewhat more than necessary, but the cutting line 1 can be deflected from the buried object B by a sufficiently safe movement width. I can do it.

In other words, as shown in Fig. 4, the center line 11 of the new cutting line 1' is set at a position where the center line 11 of the initially set cutting line 1 is shifted by S' to the side opposite to the buried object B.
It is sufficient to set it to 1'.

(c) Cutting After setting the cutting line and marking as described above,
If it is cut, it can be cut without coming into contact with the buried objects B and C.

(d) Other examples In this example, as mentioned above, the simplest case was explained, in which a vertical cutting line is drawn in a wall where there is a vertically buried object, but horizontal cutting The same principle applies not only to cutting out wall A into a rectangular shape, but also to placing marker strips 2 at the corners of cutting line 1 as shown in Figure 5, which allows for vertical and horizontal burial. You can make fine adjustments to objects in the same way.

Since the present invention is as explained above, the following effects can be expected.

(b) Even in cases where the cutting work is at risk if only checking the buried object using blueprints, etc., or even if the drawings are lost, it is possible to know in advance the positional relationship between the buried object and the cutting line by illuminating the cutting line. This allows fine adjustment of the cutting line and allows cutting to be carried out with peace of mind.

(b) It is not worth using complicated mathematical formulas to determine the width of movement of the cutting position.

This is because the overlap width between the buried object imaged on the film and the cutting line is wider than the actual overlap width, so if the actual movement width is taken as the overlap width on the film, the object will move with sufficient margin. .

In other words, the overlap width between the buried object imaged on the film and the cutting line is definitely larger than the necessary minimum width that does not cause the cutting line to come into contact with the buried object, and is also the minimum necessary width.

(c) As a conventionally known method, there is a method in which measurement is performed using at least two X-ray sources.

However, in these known methods, since X-rays are irradiated from two or more locations, double or multiple images are irradiated on the projection view.

However, hospitals and office buildings in use, etc.
In a narrow field, it is extremely difficult to actually set up irradiation sources at two locations and perform measurements due to space constraints.

Analysis of the image doubly projected onto it requires a great deal of effort.

However, the present invention is configured so that all problems can be solved using radiation from one X-ray source.

As a result, the amount of equipment used is reduced and the space taken up is minimal.

As a result, it has become possible to work extremely efficiently even when working conditions are poor, such as when remodeling a building that is currently in use.

Furthermore, there are no double projected images in the film taken by the method of the present invention.

Therefore, it is extremely easy to measure and can be quickly processed in the field.

[Brief explanation of drawings]

Figure 1: Explanatory diagram of one embodiment of the present invention, parts 2 to 4
Figure: Explanatory diagram of radiation irradiation and images; FIG. 5: Explanatory diagram of other embodiments. 1: cutting line, 2: sign band, 2': sign band image,
3: film, 4: X-ray source, 11: cutting line center line, A: wall.

Claims (1)

[Scope of Claims] 1. Placing a marker strip with approximately the same width as the cutting blade on the cutting line of the structure, arranging a radiation-sensing film on the other side of the structure, and placing 1 marker strip on the surface on which the marker strip is placed. A method for confirming the cutting position of a structure, characterized by irradiating radiation from an X-ray source at the location and finely adjusting the cutting line by shifting the cutting line by the overlap width of the marker belt image and the buried object image projected on a film.