KR101086836B1 - Unit structure of pivot joint for measuring 3D displacement and apparatus measuring 3D displacement by it - Google Patents

Abstract

The present invention is a reference point of each joint of a plurality of unit joint structures while measuring the three-dimensional (3-Dimension) inclination angle and displacement of the three-axis, XYZ axis without rotating rotation of the two hollow pipe member P, Q The reference point (O) is always made and its purpose, and the assembly structure of the unit joint structure and the probe pipe is not only simple, but also the assembly structure of the main board within the probe pipe is easy to assemble and fix the operation There is another purpose in making this efficient.

The structure of the unit joint structure of the present invention and the three-dimensional displacement measuring apparatus using the same are orthogonal protrusions 14 and orthogonal insertion grooves 12 having a height h and orthogonal hollow pipe members P and Q, and Rotating member S, but the shape of the rotating member S is a cube shape having a length d of the corner, the through hole 22 in the center thereof, and the AA axis, orthogonal to the through hole 22, the bolt hole (26) ) Is formed, the upper surface of the orthogonal protrusion 14 of the hollow pipe member P and the upper surface of the rotating member S, and the lower surface of the orthogonal protrusion 14 of the hollow pipe member Q and the rotating member S The hollow pipe members P and Q and the rotating member S are coupled by the fixing bolts 16 in a state where the lower surfaces coincide with each other so that the rotation of the hollow pipe members P and Q members does not occur. 3D rotation of members P and Q This is a smoothly made configuration.

Since the hollow pipe members P and Q can be conical rotated only when the AA and BB axes are always perpendicular to each other, the hollow pipe members P and Q do not generate rotation rotation at all. The coordinate of the reference point of is maintained as the coordinates of the reference origin (O) not only enables three-dimensional measurement, but also has the effect of further improving the reliability and precision of the measured value.

Unit joint structure, P / Q member, rotating member, orthogonal insertion groove, orthogonal protrusion, outer inclined surface, probe pipe, main board fixture, acceleration sensor module

Description

 Unit structure of pivot joint for measuring 3D displacement and apparatus 3D displacement measuring device using it

The present invention relates to a unit joint structure for three-dimensional displacement measurement and a three-dimensional displacement measuring apparatus using the same. The two hollow pipe members P and Q are rotated without rotation rotation (Rotation), 3D (3D) 3-Dimension) It is possible to measure the angle of inclination and displacement while maintaining the coordinates of the reference origin (O) at each joint point of a plurality of unit joint structures to further improve the reliability and precision of the measured values of the three-dimensional measurement. It is.

It is possible to measure the displacement of the ground or structure in three dimensions by installing it at the construction site such as ground excavation or tunnel excavation.

It is a useful technique to grasp the displacement of the ground and structure during construction of excavation, tunnel construction, etc., and to predict the behavior state based on this.

In general, measurement in civil works is to induce economic and rational construction by securing the stability of construction through risk management and prediction in the construction stage and enabling optimal design through feedback of measurement information. After completion of construction, it is to suggest the standard of maintenance and safety management to ensure the stability of the structure.

Figure 1 shows the direction of X, Y, Z for three-dimensional measurement of the behavior of the excavated tunnel.

The plane displacement of X and Z is for the displacement of the hole in the tunnel, and the plane displacement of X and Y represents the displacement in the excavation direction.

The ground state of the front of the membrane is predicted based on the measured values measured in the behavior of the excavated tunnel. It goes without saying that the prediction by three-dimensional (3D) measurement is more precise than the prediction by two-dimensional measurement.

Of course, depending on the object to be measured may be possible with two-dimensional measurement.

This is a matter of choice, but it does not mean that there are three-dimensional measurement equipment for three-dimensional (3D) measurements. Even if they are expensive, they are not suitable for underground displacement measurements due to their high structure or complexity.

A displacement measurement method using an acceleration sensor that is commonly used will be described.

In general, several probes of length L are inserted into the ground for displacement measurement.

The length of L is L = 1-5m.

The probe and the probe are connected by a joint.

The inclination angle is represented by the angle formed by the probe. The acceleration sensor measures the tilt angle of the probe. The displacement amount δ due to the inclination angle is obtained by delta = Lsinθ (see Fig. 2A).

FIG. 2A is the inclination angle measured by FIG. 2B. Reference numeral 100 denotes a measuring sensor and reference numeral 102 denotes a communication cable.

Whether measuring in two dimensions or in three dimensions, measuring the tilt angle is the same.

Next, the prior art and its problems will be described.

Prior arts include Patent 10-0290644, Patent Registration 10-0567810, and BCS (Basset Convergency System).

Patent registration No. 10-0290644 is the same as BCS (Basset Convergency System) method.

However, Patent Registration No. 10-0290644 is a technology to extend the effective area of the tunnel by eliminating the bending joint which is a problem with the effective area of the tunnel of the BCS method.

Patent registration No. 10-0290644 relates to a "two-dimensional tunnel hole measurement sensor mechanism device".

As the name suggests, pitting is two-dimensional. In other words, it is a two-dimensional measurement technique measuring only the displacement (see Fig. 1) on the plane formed by X and Z. Likewise, the BCS method is a two-dimensional measurement.

Since the patent registration No. 10-0290644 and the BCS method only measure the displacement of the two-dimensional cross section, there is no measurement of the excavation direction (Y direction) in the prediction of the behavior state based on the two-dimensional measurement. There is a problem.

In other words, it is possible to measure the internal hole displacement of the tunnel circumferential surface, but it is impossible to measure the displacement in the tunnel longitudinal direction.

Patent registration No. 10-0567810, in order to find out before the excavation of the ground displacement occurring in the front unexcavated area in front of the tunnel excavation before drilling as shown in Fig. After the built-in horizontal inclined probe (Probe) (103) is pushed into the casing, the ground displacement is measured while pulling the probe at 1m intervals.

Reference numeral 102 denotes a communication cable.

Patent registration No. 10-0567810 is also a vertical and vertical displacement, referring to Figure 1 is a structure that can measure only the displacement on the two-dimensional plane formed by X, Z, it is impossible to measure the displacement in the tunnel excavation direction (Y direction). As such, since only two-dimensional measurement is possible without measuring displacement in the excavation direction (Y direction), there is a problem in that the prediction of the behavior state based on this is not accurate.

On the other hand, even in the two-dimensional measurement, the probe should not be rotated in the joint of the probe. This is because the reference point of each joint changes when the probe is rotated.

Rotation of the probe means that the probe itself is rotated about the central axis in the longitudinal direction. Since the reference point of each joint changes when the probe is rotated, the measured tilt angle becomes unreliable.

Here, the rotation of the probe and the rotation of the probe should be distinguished.

The probe should be rotated on the X, Y or X, Y and Z axes to measure the tilt angle by the rotation. If there is no rotation of the probe in this state, the reference point at each joint always remains the same as the probe origin O even if the number of joints is increased.

However, if the probe is rotated, the reference point of each joint is different and the reference point of each joint is different.

The rotation rotation of the probe and the rotation of the probe will be described in more detail with reference to FIG. 4.

As shown in Figs. 4A and 4B, the reference for each joint O1, O2, O3 in (a) is the reference origin (O). This is because the probe is not rotated at each joint.

However, the reference of each joint O1, O2, O3 in (b) is not the reference origin (O) but each. Since the probe is rotated in each joint, the reference points of O1, O2, and O3 are not reference reference points O, but O1, O2 and O3 are respective reference points.

In terms of rotation and rotation of the probe, the joints of Patent Registration No. 10-0290644 and BCS (Basset Convergency System) method and Patent Registration No. 10-0567810 have no probe rotation prevention structure. .

However, the rotation prevention structure of the probe is not a well known technique.

This is because the rotation prevention technique of the probe is an important research subject in the field of measurement technology.

The present invention enables the measurement of 3D (3-Dimension) inclination angle and displacement with respect to XYZ axis by two members, while the reference point of each joint of the plurality of unit joint structures is always the reference origin (O). The purpose is to further improve the reliability and precision of the measured tilt angle and displacement,

Another purpose is to allow two members to rotate freely on the A-A and B-B axes that are orthogonal to each other without rotation of the two members.

The bending angle with respect to the X, Y, and Z axes, which is composed of two members, is 90 degrees, and the plane of the X and Y axes can be rotated in a cone shape based on one axis (for example, the Z axis). The vertex angle of the top is another purpose, to make it at least 120 degrees,

The assembly structure of the unit joint structure and the probe pipe is not only simple, but also the fixing structure of the main board in the probe pipe is simple, so that the assembly and fixing work are easy and the work is efficient.

The unit joint structure is capable of measuring three-dimensional tilt angle and displacement together with the acceleration sensor, which enables real-time measurement, as well as the assembly connection with the pre-fabricated measuring device, and makes it a universal structure that is easy to assemble. have.

The structure of the unit joint structure for the three-dimensional displacement measurement of the present invention is as follows.

The orthogonal insertion groove portion 12 having the depth h and the orthogonal protrusion 14 having the height h are formed of the same type of hollow pipe member P and hollow pipe member Q, and the rotating member S The shape of the rotating member S is a cube shape having a length d of the corner, and a through hole 22 is formed at the center thereof, and a bolt hole 26 is formed at the AA axis and the BB axis perpendicular to the through hole 22. While the inclined surface 28 is formed at the upper and lower edges of the rotating member S, the hollow pipe members P and Q are provided with orthogonal insertion grooves 12 and orthogonal protrusions 14, respectively. d is 1/2 the size of h, and the upper surface of the orthogonal protrusion 14 of the hollow pipe member P and the upper surface of the rotating member S rotate, and the lower surface of the orthogonal protrusion 14 of the hollow pipe member Q rotate. Hollow pipe member with the lower surface of member S coinciding with each other P and Q and the rotation member S are coupled by the fixing bolt 16, so that the three-dimensional rotation of the hollow pipe members P and Q is smoothly performed without rotation of the hollow pipe members P and Q itself. A unit joint structure for three-dimensional displacement measurement.

In addition, the hollow pipe members P and Q 2 members in the state in which the orthogonal protrusion 14 of the hollow pipe P member is completely inserted into the orthogonal insertion groove portion 12 of the hollow pipe member Q by the AA axis and the BB axis. Is formed to form a 90 degree angle.

In addition, by forming the outer inclined surface 146 on the orthogonal protrusion 14 of the hollow pipe members P and Q, the size of the cone-shaped vertex angle beta that the rotation is achieved while smoothly rotating the hollow pipe members P and Q is achieved. It is the structure which made at least 120 degrees.

Probe pipe fixing bolt holes 18 and 18 are symmetrically formed in the hollow pipe members P and Q so as to be inserted and fixed with the probe pipe Seg.
Hereinafter, 'hollow pipe member P' and 'hollow pipe member Q' will be referred to as 'P member' and 'Q member', respectively, for convenience of description.

Next, an operation relationship in which the inclination angles θ _X , θ _Y , and θ _Z are measured with respect to three X, Y, and Z axes by two P and Q members will be described.

Here, the P member and the Q member are distinguished for convenience of description because they have the same shape or different assembly and operation relationship by the AA axis or the BB axis. In addition, according to the rotation of the P member, the position is divided into P ₁ , P ₂ , P ₃ but this is the same as the P member.

5 (a) and 5 (b) show an operation relationship in which the unit joint structure for three-dimensional displacement measurement of the present invention points in three X, Y, and Z axis directions by two P and Q members.

Fig. 5A is a state diagram showing a state where the Q member is positioned on the Z axis and the P ₁ member is positioned on the Y axis.

Of Figure 5 (b) is a state diagram is also the P ₁ position in the Y-axis member in the 5 (a) is shown a state where a P ₃ members in the X-axis.

The relationship where the position changed from the P ₁ member P ₂ member P ₃ member is explained as follows.

The P ₁ member is rotated about the BB axis to be positioned as an upright P ₂ member, and then the P ₂ member is rotated about the AA axis to place the P ₃ member on the X axis.

5 (a) and 5 (b) illustrate the relationship in which two P and Q members of the unit joint structure are located in three X, Y, and Z axis directions. In addition, in order to be able to measure three-dimensional displacement, there should be a description of the process of changing the position from P ₁ member to P ₂ member to P ₃ member.

This will be described with reference to FIG. 6.

Fig. 6 is a state diagram showing a state in which the P member makes a conical rotation by the A-A axis and the B-B axis that are orthogonal to each other while the Q member is located on the Z axis.

The coordinate of the reference point _O is called (X _O Y _O Z _O ), and the coordinate of the O ₁ point is called (X ₁ Y ₁ Z ₁ ).

P and Q members are rotated only in the A-A and B-B axes which are orthogonal to each other, so they rotate while forming a conical angle β. Since the P and Q members can be conical rotated only when the A-A and B-B axes are always orthogonal, the rotation of the P and Q members does not occur at all.

As such, since only the conical rotation exists in the P and Q members without the rotation, the reference origin O is maintained as it is at the O ₁ point.

No matter how many joints of the probe pipes connected by the unit joint structure of the present invention, as long as the AA and BB axes are orthogonal to each other, the P and Q members do not have rotation rotation, so the reference origin may be O) will remain the same.

In addition, the configuration for allowing the P and Q members to rotate smoothly while increasing the conical rotation angle β includes the height h of the orthogonal projection 14 (or the depth h of the orthogonal insertion groove 12) and the height of the rotation member S. FIG. The configuration of the relationship of d = h / 2, the upper surface of the orthogonal protrusion 14 of the P member and the upper surface of the rotating member S, and the lower surface of the orthogonal protrusion 14 of the Q member and the lower surface of the rotating member S In a state where the P member, the Q member, and the rotating member S are joined by the fixing bolts 16 in a state in which they coincide with each other, the configuration in which the inclined surface 28 is formed at the upper and lower edges of the rotating member S, and That is the configuration in which the outer inclined surface 146 is formed in the orthogonal protrusion 14 of the Q member.

Since the P and Q members of the unit joint structure of the present invention are rotated only in the AA and BB axes that are orthogonal to each other, the P and Q members do not generate rotation rotation at all, so that the coordinates of the reference point of each joint are the reference origin ( Since the coordinates of O) are maintained as it is, not only three-dimensional measurement is possible, but also the reliability and precision of the measured value are further improved.

The assembly structure between the unit joint structure and the probe pipe is not only simple, but the assembly structure of the main board is simple in the probe pipe, so the assembly and fixing work is easy and the work is efficient.

The unit joint structure is economical because it is possible to measure the 3D inclination and displacement along with the acceleration sensor, and at the same time, it is possible to measure the real time and to use the assembled connection with the pre-fabricated measuring device.

Referring to the configuration of the three-dimensional displacement measuring apparatus using a unit joint structure of the present invention.

P the orthogonal insertion groove portion 12 having the depth h and the orthogonal protrusion 14 having the height h are formed of the same shape P member and Q member and the rotating member S, and the rotating member S has a corner shape. It has a cube shape having a length d and a through hole 22 is formed at the center thereof, and a bolt hole 26 is formed at the AA axis and the BB axis perpendicular to the through hole 22, and the upper and lower parts of the rotating member S are formed. While the inclined surface 28 is formed at the corner, the P and Q members have a hollow pipe shape, and the orthogonal insertion groove 12 and the orthogonal protrusion 14 are formed, and the height d of the rotation member S is 1/2 the size of h. The upper surface of the orthogonal protrusion 14 of the P member and the upper surface of the rotating member S, and the lower surface of the orthogonal protrusion 14 of the Q member and the lower surface of the rotating member S rotate together with the P member and the Q member. The member S clamps the P and Q members of the unit joint structure joined by the fixing bolts 16. Assemble and connect with the lobe pipe (Seg-0), but the P and Q member fixing bolt holes 18 are formed in the probe pipe (Seg-0), and the acceleration sensor 452, The main board M having the measurement unit 45 composed of the A / D converter 453, the controller 454, and the interface 455 is fixed to the motherboard fixture 42 by a bolt 425b. The main board fixture 42 has a communication line entry hole 422 formed therein, and the communication line 44 penetrating the communication line entry hole 422 penetrates the through hole 22 of the rotation member S to be adjacent to the probe pipe Seg-. 1) is continuously connected to the communication line 44 of the motherboard (M) built in each other, and the reference origin (O) of each joint of the plurality of series connected probe pipe (Seg-1 ~ Seg-N) is maintained as it is It is a three-dimensional displacement measuring device using a unit joint structure characterized in that.

The main board fixture 42 is fixed to the probe pipe by the main board insertion groove 424 into which the main board M is inserted, a bolt hole 425c for fixing it, and a main board fixing bolt 34b. The bolt hole 34a and the communication line inlet hole 422 are formed.

The communication line 44 passing through the communication line inlet hole 422 is continuously connected to the communication line 44 of the main board M embedded in the adjacent probe pipe Seg through the through hole 22 of the rotating member S. Connected.

At this time, the length of the probe pipe (Seg) incorporating the 3-axis acceleration sensor serves to keep the measurement interval for measuring the displacement constant, and the length is appropriately between 0.3m and 2m, and if the length is longer Since it may cause deformation due to its own deflection, the length of the pipe should be used to increase the size of the metal pipe. The size of the probe pipe (Seg) should be a circular shape with a diameter of 2 ~ 5cm or a square shape. Use metal pipes.

The measurement board 45 is built in the main board (M). The acceleration sensor module, which is the measurement unit 45, is formed of an acceleration sensor 452, an A / D converter 453, a control unit 454, and an interface 455.

The data logger 46 is formed of an interface 462, a control unit 463, an input unit 464, a storage unit 465, and an output unit 466.

A process of assembling the probe pipe Seg in which the main board M is built into the unit joint structure 100 will be described below.

First, the main board M is inserted into the main board insertion groove 424 of the main board fixture 42 and fixed by the bolt 425b. Then, the main board M is inserted into the probe pipe Seg and the main board fixing bolt 34b. It is fixed with the probe pipe.

As described above, the P and Q members of the unit joint structure 100 are inserted into and fixed to two probe pipes Seg-1 and Seg-2 to which the main board M is fixed. The P and Q members and the probe pipe Seg-1 and Seg-2 are fixed by the main board fixing bolt 34b.

As shown in FIG. 8B, the communication line 44 of the probe pipe Seg-1 penetrates the through hole 22 of the rotating member S while passing through the communication line inlet 422 of the main board fixture 42. The communication line 44 of the main board M embedded in the pipe Seg-2 is continuously connected to each other.

Real-time measurement uses a wired or wireless communication system.

The measuring unit 45 is composed of an acceleration sensor 452, an A / D converter 453, a control unit 454, and an interface 455 as shown in FIG. 10A.

When the measurement unit 45 moves due to the displacement, the acceleration sensor 452 causes a change in the output voltage, and the A / D converter 453 converts it into a digital signal and transmits it to the control unit 454.

The controller 454 stores the data and transmits the same to the data logger 104 through the interface 116.

When the measurement is continuously performed in each measuring unit 45 to which the probe pipe Seg is connected, the data logger transmits all received information to the main terminal using wired / wireless communication.

The data logger 46 has a wired / wireless communication interface 462, a control unit 463, an input unit 464, a storage unit 465, and an output unit 46 as shown in FIG. 10B. The wireless communication interface 462 transmits and receives various information stored in the main terminal and the data logger 46, the storage unit 465 stores all the information measured from the measurement unit 45, and the input unit 464 is a user The controller 463 receives various commands from the controller, and the output unit 466 outputs the information of the input unit 464 and the measured information from the measurement unit 46. The control unit 463 uses the wired / wireless communication interface 462 and each unit. It serves to control.

The wire / wireless interface 462 not only transmits the displacement information request signal from the measurement unit 46 under the control of the controller 463, but also receives the displacement information from the measurement unit 46 and transmits the displacement information to the controller 463. Under the control of the controller 463, the displacement information is transmitted to the main stage.

That is, the data logger 46 directly transmits a control signal to the measuring unit 46 and collects displacement information, and then outputs the information through the output unit 466 as well as transmitting the information from the main terminal. do.

In addition, the controller also receives a control signal from the main terminal and receives and transmits the measured displacement.

That is, displacement information may be collected by automatically transmitting a signal to a measurement device according to a preset measurement timetable.

In the main terminal, a program for analyzing the measured data is interrogated, and various displacement information can be transmitted and received through wired / wireless communication with the data logger 46.

The three-dimensional displacement measuring apparatus using the unit joint structure of the present invention can measure any construction site. For example, as shown in Figure 9a, 9b, 9c, 10a, 10b, 10c it can be used in the trench site, slope, dam site, tunnel and the like. The inside of the measuring device is waterproof so that it can be installed underwater.

When the three-dimensional displacement measuring device using the unit joint structure of the present invention is carried out in the ground as shown in Figs. 11A, 11B, and 11C, the measuring device is drilled horizontally or vertically within about 10 cm in diameter and then placed inside the drilling hole. After inserting and cement grouting the space inside or filling with residue or sand, fix the measuring device and measure the ground displacement according to the construction in three dimensions.

In the case of the outside of the ground, no drilling work is required, and as shown in FIGS. 12A, 12B and 12C, the anchor bolt 125 or the lock bolt 125 or the like is used for the fixing hole 123 in the double bending joint. After a fixed installation in the position that needs to be measured, you can measure the three-dimensional displacement of the ground or structure.

1 is an example showing the X, Y, Z directions for measuring the behavior of the excavated tunnel in three dimensions

Figure 2a] displacement measurement by the acceleration sensor

2b] Conventional ground displacement measurement cross section

3 is a cross-sectional view of a prior tunnel tunnel displacement measurement

4 is a conceptual diagram showing a state in which the probe pipe joint is rotated without rotation rotation and a rotation state with rotation rotation.

5A and 5B are state diagrams showing a state in which two P and Q members of the unit joint structure of the present invention are positioned in the X, Y, and Z directions by the A-A and B-B axes that are orthogonal to each other.

6 is a conceptual view showing a P member rotating in a conical shape without rotation rotation in a state where the A-A axis and the B-B axis are always orthogonal to each other.

7A is a perspective view showing a state in which the unit joint structure and the probe pipes Seg-0 and Seg-1 of the present invention are assembled in series;

FIG. 7B is a perspective view of the probe pipe Seg-1 rotated in FIG. 7A

7C is a state diagram showing a state in which the probe pipe is continuously assembled with the unit joint structure of the present invention.

8A is an exploded perspective view of the unit joint structure and the probe pipes Seg-1 and Seg-2 of the present invention.

Fig. 8B is a cross-sectional view of the probe pipe in the state in which Fig. 8A is assembled.

9 is an exploded perspective view of the main board embedded in the probe pipe Seg and related thereto

10A is a block diagram of a measuring module according to the present invention

10B is a block diagram of a datalogger according to the present invention.

11A, 11B, and 11C are provided in the ground according to the present invention.

12A, 12B and 12C] Embodiments provided outside the ground according to the present invention

※ Brief Description of Drawings

1. Unit joint structure

100; Unit joint structure

end. P member; Q member;

12; Orthogonal insertion groove portion;

14; Orthogonal protrusions, 142; A-A axis point, 144; B-B axis point, 146; Outer Slope,

16; Fixing bolt

18; Probe Pipe Fixing Bolt Hole

I. Rotating member S;

22; Through Hole,

24; A-A Axes,

25; B-B axis point

28; incline

All. Probe pipe

Seg; Probe pipe

32a; P, Q member inserter, 32b; volt

34a; Motherboard Fixture Bolts

34b; Motherboard fixture bolts

la. Mainboard

M; Mainboard

42; Motherboard fixture, 422; Communication line entry hole, 424; Motherboard insertion groove, 425a; Motherboard bolt holes, 425b; Bolt, 425c; Bolt hole, 426; Fixing bolts,

44; Communication line

45; Measuring unit (acceleration sensor module), 452; Acceleration sensor, 453; A / D converter, 454; Control unit 455; interface

46; Data logger, 462; Interface, 463; Control unit 464; Input unit 465; Storage 466; Output,

Claims (6)

The orthogonal insertion groove 12 having a depth h and the orthogonal protrusion 14 having a height h are formed of hollow pipe members P and Q of the same shape and orthogonal to each other, and the rotation member S is formed. Is a cube shape having a length d of a corner, and a through hole 22 is formed at the center thereof, and a bolt hole 26 is formed at an AA axis and a BB axis perpendicular to the through hole 22, and the image of the rotating member S ㆍ An inclined surface 28 is formed at the lower edge, while the hollow pipe members P and Q are formed with orthogonal insertion grooves 12 and orthogonal protrusions 14, respectively, and the height d of the rotating member S is 1 of h. The upper surface of the orthogonal protrusion 14 of the hollow pipe member P and the upper surface of the rotating member S, and the lower surface of the orthogonal protrusion 14 of the hollow pipe member Q and the lower surface of the rotating member S The hollow pipe members P and Q and the rotating member S 3, characterized in that the three-dimensional rotation of the hollow pipe member P, Q is smoothly made without being coupled by the fixed bolt 16, without the rotation of the hollow pipe member P, Q itself Unit joint structure for dimensional displacement measurement The method of claim 1 The hollow pipe members P and Q 2 are formed in a state where the orthogonal protrusion 14 of the hollow pipe member P is completely inserted into the orthogonal insertion groove portion 12 of the hollow pipe member Q by the AA axis or the BB axis. Unit joint structure for three-dimensional displacement measurement, characterized in that the angle formed by 90 degrees The method according to claim 1 or 2 Three-dimensional displacement, characterized in that the outer inclined surface 146 is formed on the orthogonal protrusion 14 of the hollow pipe members P and Q so that the conical rotation angle of the hollow pipe members P and Q is rotated at least 120 degrees. Unit joint structure for measurement The method according to claim 1 or 2 Unit probes for three-dimensional displacement measurement, characterized in that two symmetrical probe pipe fixing bolt holes 18 are formed in the hollow pipe members P and Q, but coplanar with the AA axis (or BB axis). Structure The orthogonal insertion groove 12 having a depth h and the orthogonal protrusion 14 having a height h are formed of hollow pipe members P and Q of the same shape and orthogonal to each other, and the rotation member S is formed. Is a cube shape having a length d of a corner, and a through hole 22 is formed at the center thereof, and a bolt hole 26 is formed at an AA axis and a BB axis perpendicular to the through hole 22, and the image of the rotating member S ㆍ An inclined surface 28 is formed at the bottom edge, while the hollow pipe members P and Q have an orthogonal insertion groove portion 12 and an orthogonal protrusion 14 formed thereon, and the height d of the rotation member S is 1 / h. The upper surface of the orthogonal protrusion 14 of the hollow pipe member P member and the upper surface of the rotating member S are two sizes, and the lower surface of the orthogonal protrusion 14 of the hollow pipe member Q and the lower surface of the rotating member S The hollow pipe members P and Q and the rotating member S are fixed in a state where they coincide with each other. The hollow pipe members P and Q of the unit joint structure 100 coupled by the bolts 16 are assembled and connected with the probe pipe Seg-0, but the hollow pipe members are attached to the probe pipe Seg-0. P, Q member fixing bolt hole 18 is formed, the probe pipe (Seg-0) measuring section consisting of an acceleration sensor 452, A / D converter 453, control unit 454, interface 455 The main board M having a built-in 45 is fixed to the main board fixture 42 by bolts 425b, and the main board fixture 42 has a communication line entry hole 422 formed therein. The communication line 44 penetrating 422 is continuously connected to the communication line 44 of the main board M embedded in the adjacent probe pipe Seg-1 through the through hole 22 of the rotating member S. The unit joint sphere characterized in that the reference origin (O) of each joint of the plurality of serially connected probe pipes (Seg-1 to Seg-N) is maintained as it is. Three-dimensional displacement measuring apparatus using the body The method of claim 5 The hollow pipe members P and Q 2 are formed in a state where the orthogonal protrusion 14 of the hollow pipe member P is completely inserted into the orthogonal insertion groove portion 12 of the hollow pipe member Q by the AA axis or the BB axis. Three-dimensional displacement measuring device using a unit joint structure, characterized in that the angle formed by 90 degrees

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