JPH1183412A - Position measuring device for h-sections and measuring method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately measure position and attitude of H-sections by a simple construction and method accurately in a short time and by a remote control, when a measuring object is a long object with almost the same cross section at each part such as a square pillar of H-sections, its entire size is already known and it is also known that its longitudinal direction is almost vertical. SOLUTION: Four detector rods 2a-2d are laid in parallel each other on the same flat plane, each rod 2a-2d is attached to a base pedestal retractably or slidably and four rods 2a-2d are simultaneously attached to it so as to freely rotate and move laterally, these four rods 2a-2d are abutted to two surfaces of flanges 1a, 1b and one surface of a web 1c, or to one surface of the flanges 1a, 1b and one surface of the web 1c, and the same surface where plural abutting points exist is calculated, so that based on this surface, position or attitude of a H-sections with an already-known shape is calculated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for measuring the position of an H-beam, for example, as a pile buried in the ground.

[0002]

2. Description of the Related Art For example, when a tunnel is excavated with a shield excavator, an H-beam as a pile buried in the ground may be hit. It needs to be cut and removed because it is an obstacle to

[0003] Prior to cutting and removing, it is necessary to accurately grasp the location and posture of the H-section steel. However, as a method of measuring the position and posture, a contact type is generally used. There are a device and a non-contact device, and it is conceivable to adopt a non-contact method for H-section steel buried underground.

[0004] The non-contact type measures the location and orientation of the H-beam, which is the object to be measured, based on data such as the reflection time through a laser beam, an ultrasonic wave, an electromagnetic wave or the like.

[0005] However, among these, the use of a laser beam, if dust, mist, muddy water, etc. are present in the use environment, hinders the progress due to the dust and the like, making it difficult to use. Further, those utilizing ultrasonic waves or electromagnetic waves have poor directivity, so that only an approximate position can be measured, and sufficient measurement accuracy cannot be obtained. For this reason, after the measurement by the non-contact type measuring device, the soil and the like in front of the H-section steel are temporarily removed, and then a more accurate position is measured by the contact type device.

Even in the case of a contact type measuring device, it is difficult to directly measure the position and posture of an H-shaped steel column or the like existing in the shield cross section by hand, and it is difficult to measure the position and posture from inside the shield machine. It will be measured remotely. Conventionally, there is a device as shown in FIGS. 13 to 15, which has a detection rod 7 which is slidable in the axial direction. 1 slide in the axial direction toward the direction of the steel frame, etc.
When the tip of the detection rod 7 comes into contact with the H-beam 1, the sliding distance is measured to calculate the distance to the end point, which is the contact point of the H-beam 1, and H is calculated based on the moving distance. Shaped steel 1
Is calculated.

[0007] When one measuring rod 7 is used in such a measuring device, the number of measuring points is one. On the other hand, when calculating the position and orientation of the H-section steel 1, it is necessary to collect the contact points at a plurality of locations. For this reason, conventionally, for example, as shown in FIG. The tip is rotated circumferentially with the portion as the center axis of rotation, and the angle of the detection rod 7 with respect to the H-shaped steel 1 is slightly changed, and the detection rod 7 is moved to the H-shaped steel 1 at each of these different angles. Move in the direction,
Calculate the moving distance.

Alternatively, as shown in FIG. 14, the entirety of one detecting rod 7 is linearly and slightly moved in the lateral direction with respect to the H-section steel 1 to change the position of the detecting rod 7, and the position of the Then, the tip of the detection rod 7 is moved toward the H-beam 1 to calculate the movement distance for each different position.

[0009] Alternatively, as shown in FIG.
Are arranged side by side in the form of a comb, and these detection rods 7 are simultaneously operated to calculate the moving distances of the detection rods 7 at a plurality of locations.

As described above, a plurality of contact points, that is, measurement points are obtained on the same plane as shown in FIG. 16, and these points are connected in a straight line to form a plurality of straight lines. Since it is obvious that the straight lines correspond to the flanges 1a, 1b or the web 1c of the H-section steel 1, from the relative positional relationship of the straight lines, which of the straight lines corresponds to the flanges 1a, 1b or the web 1c. The position and orientation of the H-beam 1 existing as an obstacle are calculated by estimating and applying the shape and size to the known H-beam 1.

In this case, there are three measurement points as shown in FIG.
When the two adjacent points are located on the flange 1a or 1b or on the web 1c, the attitude of the H-section steel 1 can be calculated, but it is difficult to measure the position accurately.

[0012]

When measuring with a measuring device having only one detecting rod 7 as shown in FIGS. 13 and 14, it is necessary to obtain a plurality of contact points as described above. By rotating the base end of the detection rod 7 by a certain angle and calculating the moving distance for each angle, or by linearly moving the detection rod 7 by a certain distance in the horizontal direction, and It is necessary to calculate the moving distance.

In this case, since the rotation angle and the linear movement distance of the base end of the detection rod 7 are not continuous, the measurement accuracy of the end and the joint of the H-section steel 1 to be measured deteriorates. There is a risk. To solve such inconvenience, the rotation angle and the linear movement distance may be changed in small increments. However, in this case, the measurement time is prolonged and the workability is not good.

Further, in a measuring device in which the detection rods 7 are arranged side by side in a comb shape as shown in FIG. 15, it is necessary to prepare a large number of detection rods 7, which increases the number of parts and complicates the structure. The measurement points and measurement intervals are fixed, and the degree of freedom of measurement may be rather narrowed.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art. The object to be measured is long, such as an H-section steel prism, and has the same cross-sectional shape at each part, the entire size is also known, and the longitudinal direction is substantially vertical. H-section position measurement device and measurement device that can measure the position and orientation of H-section steel by remote control in a short time and accurately with a simple structure and method in the case where it is known to be located at It is to provide a method.

[0016]

According to the present invention, in order to achieve the above object, as an apparatus, four detection rods are arranged in parallel on the same plane, and each rod can be extended and contracted or slidable back and forth.
The gist is that the detection rods are simultaneously attached to the base so as to be rotatable and laterally movable on the same plane.

As a method, first, four detection rods arranged in parallel on the same plane are simultaneously rotated and laterally moved on the same plane, and the tip positions of the respective detection rods are moved back and forth,
The tips of all four sensing rods are brought into contact with the surface in the longitudinal direction of the H-section steel having a known size and shape so that at least the tips of two adjacent sensing rods are in contact with the same surface. The gist is to calculate the position and orientation of the H-section steel from the contact position between the surface and the web 1 surface.

Second, four detection rods arranged in parallel on the same plane are simultaneously rotated and laterally moved on the same plane, and the front end positions of the respective detection rods are moved back and forth, so that at least two adjacent detection rods are moved. With the tips of the detection rods in contact with the same surface, the tips of all four detection rods are brought into contact with the surface in the longitudinal direction of the H-section steel of which size and shape are known, on the flange 1 surface and the web 1 surface. The gist is to calculate the position and orientation of the H-beam from the contact position in the above.

According to the first aspect of the present invention, all of the four detection rods simultaneously rotate on the same plane or move in a straight line, and the tip of each detection rod is the object to be measured. If the tip of the detection rod moves toward the H-section steel and further toward the H-section for each detection rod, the tip of the detection rod contacts the H-section steel at four points at the same time. Based on this, the position and orientation of the H-section are calculated.

In this case, the object to be measured is limited to H-section steels which are long, have the same cross-sectional shape at each part, have a known overall size, and are positioned substantially vertically in the longitudinal direction. It is possible to determine the position and posture of the H-beam by simply obtaining the contact point, so that only four detection rods are required, and the device can be a simple structure, and one detection rod can be measured. The operability is good because it is not necessary to rotate or move little by little at a predetermined angle and a predetermined distance with respect to the object.

According to the second aspect of the present invention, an H-section steel whose size and shape are known is 4 mm from the side in the longitudinal direction.
When the tips of the detection rods are moved and brought into contact, the contact surface is a maximum of three surfaces of two flanges and one web,
When the four detection rods are in contact with three surfaces, at least two adjacent points of the four contact points are in contact with the same surface. Since it is certain that the surface having the two contact points is a flange or a web, the size or the size is determined based on the positional relationship between the two contact points existing on the same surface and the other two contact points. Calculate the position and orientation of the H-section steel whose shape is known.

According to the third aspect of the present invention, an H-shaped steel having a known size and shape is positioned at a distance of 4 mm from the side in the longitudinal direction.
When the tips of the detection rods are moved and brought into contact with each other, depending on the angle of the detection rods with respect to the H-section steel, the contact surfaces of the four detection rods are two in total: one flange surface and one web surface. In this case, two or three sensing rods are in contact with the same surface, and since it is certain that this surface is a flange or a web, there are three points or The position and orientation of the H-section steel whose size and shape are known are calculated from the positional relationship between the two contact points and the other one or two contact points.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of an object position measuring apparatus of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a side view of the same, and the measuring apparatus of the present invention has four parallel detections on the same plane. The rods 2a, 2b, 2c, and 2d are configured as main constituent elements.
a, 2b, 2c, and 2d were attached to the moving devices 3a, 3b, 3c, and 3d so as to be slidable or extendable and contractible in the respective axial directions. As the moving device, a mechanism such as a cylinder, a gear, and a piston is appropriately adopted.

The moving devices 3a to 3d to which the detection rods 2a to 2d are mounted are mounted on a moving device 4 using a driving mechanism such as a motor. The moving device 4 has a moving base 4b slidably mounted on a long base 4a in the longitudinal direction of the base 4a, and is provided on the same surface of the upper surface of the moving base 4b.
a to 2d are juxtaposed at regular intervals in a state where the axial direction thereof coincides with the moving direction of the moving table 4b.

The installation interval of the detection rods 2a to 2d is set at one end because all four detection rods 2a to 2d need to contact the H-shaped steel to be measured as described later. The installation interval between the detection rod 2a located at the other end and the detection rod 2d located at the other end is 80% to 90% of the length of one side of the H-section steel.
% Is appropriate, and this length is, for example, when an H-section steel having a side length of 300 mm is set as an object to be measured, a detection rod positioned at one end is used. 2a
The installation interval of the detection rod 2d located at the other end is 240 to 27
It is about 0 mm.

The lower center of the base 4a of the moving device 4 is rotatably supported by a rotating device 5 using a driving mechanism such as a motor. The support shaft is oriented in the up-down direction of the base 4a, and the direction of rotation is adjusted by the moving device 4, the moving devices 3a to 3d, and the detection rods 2a to 2d supported by the turning device 5 as a whole. On the same plane.

Then, the rotating device 5 is movably supported by the moving device 6. The moving device 6 also has the same structure as the moving device 4, and has a movable base 6b slidably mounted on a long base 6a in the longitudinal direction of the base 6a. Is set perpendicular to the longitudinal direction of the H-section steel, and the moving table 6b is installed so as to move in the lateral direction with respect to the H-section steel.

In this state, the detection rods 2a to 2d can be moved laterally on the same plane by the moving device 6, can be rotated by the rotating device 5, can be moved back and forth by the moving device 4, and can be detected by the moving devices 3a to 3d. Each of the rods 2a to 2d is installed so as to be movable back and forth.

Although not shown, the moving devices 3a to 3a are connected to the output side of a control device such as a computer.
d, the driving units of the moving device 4, the rotating device 5, and the moving device 6 are connected, and the control device detects the moving distance of the detection rods 2a to 2d by the moving devices 3a to 3d and the moving devices 4, 6.
Storage means and detection rod 2 for H-section steel to be measured
Detection means for detecting the presence or absence of the contact of a to 2d, and calculation means for calculating the position of the H-section steel based on the data stored in the detection / storage means and the detection data from the detection means.

In this case, the moving devices 3a to 3d which can monitor the moving torque are used, and the output torque from the moving devices 3a to 3d is introduced to the detecting means for detecting the presence or absence of the contact of the detecting rods 2a to 2d of the control device. I do.

Next, a method for measuring the position and orientation of the H-section steel 1 which is the object to be measured by using such a measuring device will be described. The measurement object is, for example, an H-beam 1 used as a prism or the like, and the flanges 1a and 1b having two cross-sectional shapes.
It is assumed that it is a long object having the same length in each part composed of the web 1c on one side, the size is also known, and the longitudinal direction is located almost vertically.

FIG. 4 shows a first embodiment of the measuring method.
The tips of all the detection rods 2a to 2d are brought into contact with the surface in the longitudinal direction of the H-section steel 1 having a known size and shape, and the two flanges 1a and 1b and the one contact surface on the web 1c from the contact position. The position and orientation of the H-section steel 1 are calculated by moving the moving table 6b of the moving device 6 sideways along the base 6a, and further driving the rotating device 5 to move the moving device 4 to the moving device 6. , And moves the movable table 4b back and forth on the base 4a, and the four detection rods 2a to 2 arranged in parallel on the same plane on the movable table 4b.
2d is positioned obliquely in the longitudinal direction of the H-section steel 1.

As described above, when the H-shaped steel 1 is viewed from the oblique side in the longitudinal direction, that is, from the side of the four detection rods 2a to 2d, the number of faces of the H-shaped steel 1 viewed from this direction is two. When the end portions of the flanges 1a and 1b are removed from the shape of the H-section steel 1 composed of the flanges 1a and 1b and the web 1c of one surface, a total of three surfaces of two surfaces of the flanges 1a and 1b and one surface of the web 1c are provided. Is the largest.

In this state, when the moving devices 3a to 3d are driven to extend the tip ends of the detection rods 2a to 2d toward the H-section steel 1, four detection rods 2a to 3 for three surfaces are provided.
Since 2d exists, the four detection rods 2a to 2d contact two surfaces of the flanges 1a and 1b and one surface of the web 1c,
Further, a case is conceivable in which two adjacent detection rods always contact the same surface.

Since the same surface contacted by two adjacent detection rods is any one of the flanges 1a and 1b and the web 1c, this surface is determined by the relative relationship with the other two contact points. If specified, since the shape and size of the H-section steel 1 are known, the overall position and orientation can be determined.

Here, a method of specifying which of the flanges 1a, 1b and the web 1c the same surface where the two adjacent detection rods are in contact with will be described with reference to FIG. Four detection rods 2a to 2d are flanged 1a, 1b
The contact point when two surfaces of the web 1c and one surface of the web 1c contact each other is P
1, P2, P3, and P4, the controller detects only these four points P1, P2, P3, and P4, and at this stage, it is also clear at this stage which two of these points are located on the same plane. I haven't.

The four contact points P1, P2, P3, P4
Is based on the moving distances of the moving devices 4 and 6, the turning angle of the turning device 5, and the moving distances of the moving devices 3a to 3d.
Determined on coordinates.

Therefore, first, as shown in FIG.
Assuming that 3 is located on the same plane, a straight line L passing through points P2 and P3 is drawn. Assuming that this straight line L is one of the flanges 1a or 1b, the straight line L passes through the other points P1 and P4.
Either of the straight lines m1 and m4 parallel to the above becomes the other flange 1b or 1a. However, since the distance between the straight line L and the straight lines m1 and m4 is different from the distance between the flanges 1a and 1b of the H-section steel 1 of a known size, the straight line L cannot be one of the flanges 1a and 1b. And reach the conclusion.

Then, it can be determined that the straight line L is located on the surface of the web 1c, and by drawing straight lines n1 and n4 passing through the other points P1 and P4 respectively and orthogonal to the straight line L, this straight line n
1 and n4 can be determined to be located on the surfaces of the flanges 1a and 1b, respectively. Since the entire shape and size of the H-beam 1 are known, both the position and the posture of the H-beam 1 can be calculated.

FIG. 5B shows a case where the points P1 and P2 are located on the same plane. A straight line L4 passing through the point P4 and a straight line m4 passing through the point P4 in parallel with the straight line L passing through the points P1 and P2 are shown. , The straight line L passing through the points P1 and P2 is located on the flange 1a, the straight line m4 is located on the other flange 1b, and the straight line n3
Is located on the web 1c and the overall shape is H. However, since the size is different from the known shape, the points P1,
It can be determined that P2 cannot be located on the same plane.

Further, a point P3 parallel to the straight line L
, And the straight line n4 passing through the point P4 and orthogonal to the straight line L does not become a known H-section steel 1 having a known size and shape. Therefore, the points P1 and P2 must be located on the same plane. Can be determined to be impossible.

FIG. 5C shows a case where the points P3 and P4 are located on the same plane. A straight line L2 passing through the points P3 and P4 and a straight line n2 passing through the point P2 and a straight line L The straight line m1 passing through the point P1 in parallel with the straight line L allows the straight line L to be located at the flange 1a, the straight line n2 to be located at the web 1c, and the straight line m1 to be located at the flange 1b. , The size of which is different from the known one, and the detection rod 2b is a flange 1a where the straight line m1 is located.
, And such a thing cannot occur. Therefore, it can be determined that the points P3 and P4 cannot be located on the same plane.

From the above results, the contact points P1, P2, P3, and P4 are detected at the positions shown in the figure, and the four detection rods 2a to 2d are connected to the two surfaces of the flanges 1a and 1b and the web 1c.
In this case, the point P1 is located on the flange 1a, the points P2 and P3 are located on the web 1c, the point P4 is located on the flange 1b, and the H-section steel 1 shown in FIG. ) Can be determined to be in the position and posture as shown in FIG.

In the above example, the contact points P1, P2, P3, P
4 is a case where two points P2 and P3 are located on the web 1c, but as a case where four detection rods 2a to 2d are in contact with two surfaces of the flanges 1a and 1b and one surface of the web 1c. As shown in FIG. 6, points P1 and P2
a, the point P3 may come into contact with the web 1c, and the point P4 may come into contact with the flange 1b.
Which part of the H-section steel 1 is in contact with P2, P3, and P4 can be calculated by the same method as described above.

FIG. 7 shows a second embodiment of the measuring method.
The tips of all the detection rods are brought into contact with the surface in the longitudinal direction of the H-shaped steel whose size and shape are known, and the position of the H-shaped steel is determined based on the contact position on one of the flange 1 surface and the web 1 surface. The posture is calculated, and for the three faces of the H-section steel 1, 4
One of the detection rods 2a to 2d
This is the case where the surface contacts the web 1 surface.

In this case, since there are four detection rods 2a to 2d for two surfaces, there are two or three contact points on at least one surface. Therefore, if it is determined whether this surface is the flange 1a, 1b or the web 1c, the entire position and orientation can be calculated.

Therefore, for example, when the contact points P1, P2, P3, and P4 exist at the positions as shown in FIG. 7, to specify the position and the posture of the H-section steel 1 as shown in FIG. P
Assuming that P2, P3 and P4 are located on the same plane,
Draw a straight line L passing through the points.

Assuming that the straight line L is located on one of the flanges 1a, a straight line m that is parallel to the straight line L and passes through the remaining contact points P1 is drawn. This straight line m is located at the other flange 1b, but the straight line m is located at the contact points P2, P3, P4
Can not intersect with the detection rods 2b, 2c, 2d reaching the contact point P, the straight line m does not extend to a position facing the contact points P2, P3, P4.

When the parallel straight line L and the straight line m thus obtained are assumed to be the flanges 1a and 1b, such a shape is different from the known shape of the H-section steel 1. It can be determined that it cannot be located at 1b.

Next, assuming that the straight line L is located on the web 1c, a straight line n orthogonal to the straight line L and passing through another contact point P1
Is located on one of the flanges, and further, the intersection Q of the straight line L and the straight line n is obtained. From these data, the one flange 1a and the web 1c can be specified. If the shape is applied to this, the position of the other flange 1b can also be estimated, and the overall position and orientation of the H-beam 1 can be calculated.

As described above, the four detection rods 2a-
When 2d contacts one of the flange 1 surface and the web 1 surface, the entire position and posture of the H-beam 1 is calculated. As shown in FIG. 9, two detection rods 2a to 2d
Are in contact with the flange 1a and the web 1c, respectively, or as shown in FIG. 10, three detection rods 2a, 2b and 2c are in contact with one flange 1a and the remaining one detection rod 2d is in contact with the web 1c. In this case, the contact surface is calculated in the same manner as described above.

Incidentally, even if the contact surfaces are two as shown in FIGS. 11 (a) and 11 (b), two parallel flanges 1a and 1b are provided.
When the tips of the detection rods 2a to 2d come into contact with each other, the posture of the H-section steel 1 can be determined by the positions of the flanges 1a and 1b on the two surfaces, but the tips of the detection rods 2a to 2d are Since it is unknown which position is in contact, the exact position of the H-beam 1 cannot be determined. However, depending on the size of the H-section steel 1, the arrangement positions of the detection rods 2a to 2d, and the detection rods 2a to 2d cannot be orthogonal to the H-section steel 1, the position is set within a certain error range. It is possible to estimate.

As shown in FIGS. 12A, 12B and 12C,
When all the tips of the four detection rods 2a to 2d are in contact with the same surface, any one of the two surfaces of the flanges 1a and 1b of the H-section steel 1 and the one surface of the web 1c is used. Although the posture can be determined, it is impossible to determine whether the surface corresponds to the flange 1a, 1b or the web 1c, and the position of the entire H-section steel 1 cannot be determined. Therefore, when all the four points at the tips of the detection rods 2a to 2d are located on the same plane, it is impossible to determine the posture or the position of the H-beam 1.

In such a case, the direction of the detection rods 2a to 2d with respect to the H-section steel 1 is changed by driving the moving device 6 and the rotating device 5 so as to make contact with the three surfaces of the flanges 1a and 1b and the web 1c. The flange 1a (or 1b) is brought into contact with the two surfaces of the web 1c.

As described above, at least two contact points adjacent to each other on the same surface are discriminated, and one of the flanges 1a, 1b and the web 1c is specified based on this.
Further, based on this, the position and orientation of the H-beam 1 whose size and shape are known are determined.

The tips of the detection rods 2a to 2d may come into contact with the ends of the flanges 1a and 1b, but the area of this end face is small compared to the surface area of the flanges 1a and 1b and the web 1c. Yes, the possibility of contact is low, and even if the contact is made, the thickness of the flanges 1a and 1b is small, so even if it is determined that the contact is made with the surfaces of the flanges 1a and 1b, the measurement result is not significantly affected. Things.

[0057]

As described above, the measuring device of the present invention
All four detection rods are simultaneously rotated on the same plane,
Or, it moves in a straight line and moves the tip of each detection rod toward the H-shaped steel that is the object to be measured. It is possible to determine the position and orientation of the H-beam by simply obtaining the contact point.
Therefore, the number of the detection rods is only four, so that the apparatus can have a simple structure. It is necessary to rotate or move one detection rod little by little at a predetermined angle and a predetermined distance with respect to the object to be measured. There is no operability.

In the measuring method of the present invention, first, the tips of the four detection rods are moved from the side in the longitudinal direction with respect to the H-shaped steel having a known size and shape, and the two faces of the flange are moved. Only four detection rods are brought into contact with a total of three surfaces, ie, one surface of the web and one surface of the web, or two surfaces of one surface of the flange and one surface of the web. The position and orientation of the H-section steel whose size and shape are known can be easily calculated from the relative positional relationship with other contact points.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a measuring device of the present invention.

FIG. 2 is a front view showing an embodiment of the measuring device of the present invention.

FIG. 3 is a side view showing an embodiment of the measuring device of the present invention.

FIG. 4 is a plan view of a first example showing the first embodiment of the measuring method of the present invention.

FIG. 5 is an explanatory diagram of position and orientation calculation showing a first embodiment of the measurement method of the present invention.

FIG. 6 is a plan view of a second example showing the first embodiment of the measurement method of the present invention.

FIG. 7 is a plan view of a first example showing a second embodiment of the measurement method of the present invention.

FIG. 8 is an explanatory diagram of position and orientation calculation showing a second embodiment of the measurement method of the present invention.

FIG. 9 is a plan view of a second example showing the second embodiment of the measurement method of the present invention.

FIG. 10 shows a third embodiment of the measurement method according to the present invention.
It is a top view of an example.

FIG. 11 is a plan view of another example in which a detection rod is in contact with two parallel surfaces.

FIG. 12 is a plan view of an example in which a detection rod is in contact with one surface.

FIG. 13 is a plan view showing a first example of a conventional measuring device.

FIG. 14 is a plan view showing a second example of a conventional measuring device.

FIG. 15 is a plan view showing a third example of a conventional measuring device.

FIG. 16 is an explanatory diagram of a method of calculating a position and a posture of a measurement object from a contact point of a detection rod.

FIG. 17 is a plan view of a conventional measurement method.

[Explanation of symbols]

1 H-section steel 1a, 1b Flange 1c Web 2a, 2b, 2c
2d: Detection rod 3a, 3b, 3c, 3d: Moving device 4: Moving device 4a: Base 4b: Moving table 5: Rotating device 6: Moving device 6a: Base 6b: Moving table 7: Detection rod

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Kenji Shibata Kashima Construction Co., Ltd. Technical Research Institute 2-9-1-1 Tobita-Shi, Chofu-shi, Tokyo

Claims (3)

[Claims] 1. A base in which four detection rods are arranged in parallel on the same plane, and each rod can be extended and contracted or slidable back and forth, and the four detection rods can be simultaneously rotated and horizontally moved on the same plane. A position measuring device for an H-shaped steel, wherein the position measuring device is mounted on a steel plate. 2. The four detection rods arranged in parallel on the same plane are simultaneously rotated and laterally moved on the same plane, and the front end positions of the respective detection rods are moved back and forth to at least two adjacent detection rods. The tips of all four detection rods are brought into contact with the surface in the longitudinal direction of the H-section steel of which size and shape are known so that the tips of A position measurement method for an H-section steel, wherein the position and orientation of the H-section steel are calculated from the contact position. 3. The four detection rods arranged in parallel on the same plane are simultaneously rotated and laterally moved on the same plane, and the front end positions of the respective detection rods are moved back and forth, so that at least two adjacent detection rods are detected. The tips of all four detection rods are brought into contact with the surface in the longitudinal direction of the H-section steel of which size and shape are known so that the tips of A position measurement method for an H-section steel, wherein the position and orientation of the H-section steel are calculated from the contact position.