JP2932594B2 - Structure reaction force management method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention manages a reaction force at each support point of a structure, and controls the reaction force of a structure that supports the structure in a posture of a stress-free natural body. Regarding management methods.

[Prior Art] The present applicant has previously provided a structural reaction force management method suitable for supporting a structure with a plurality of jacks (supporting devices) in a posture of a natural body in which a manufacturing error has appeared. I did
63-261120).

[Problems to be Solved by the Invention] An object of the present invention is to provide a reaction force management method for a structure that can start supporting the structure stably when the structure is supported by the support device. And

[Means for Solving the Problems] In order to achieve the above object, the present invention supports a structure with a plurality of support devices in order to inspect the shape of the structure separately. The structure is manufactured by adjusting the amount of upward projection of each support device so that the reaction force acting on the object becomes equal to the load theoretically acting on each support device by the weight distribution on the structure. In the method for managing the reaction force of a structure supported by the posture of the natural body in which the error of appears, in advance, the structure is supported at a predetermined height by another support, and then each supporting device is raised simultaneously. ,
When the upper end position of each support device reaches a certain distance from the structure, the ascent is temporarily stopped, and after all the support devices are stopped, all the support devices are simultaneously raised again, and the upper end of each support device is moved to the above-mentioned position. This is a method in which each supporting device supports the structure by being brought into contact with the structure.

In addition, the method of stopping the ascent when the upper end position of the structure and the upper end of the support device comes to a certain distance is attached to the upper end portion of the support device when the distance between the upper end position of the support device and the structure becomes constant. A signal is sent from the proximity switch to the system controller to stop the lifting of the supporting device.

[Operation] In the present invention, since the upper end of each support device comes into contact with the lower surface after being arranged at an equal distance from the lower surface of the structure, the upper end of each support device contacts the lower surface of the structure almost simultaneously. Come into contact. Therefore, the support of the structure can be started stably, and the structure can be supported by a simple control such as stopping the movement of each support device at the same time. The present invention utilizes the following basic principle.

For example, if a structure is floating in outer space,
Since the structure is not constrained at all by the surroundings, if the structure has a natural shape unique to the structure, that is, if there is a manufacturing error in the structure, the error appears. The present invention is to reproduce such a natural shape in a pseudo manner on the ground.

Assuming that the structure is manufactured without error and that the bottom surface is a perfect plane having no curvature or distortion, when the bottom surface of the structure is supported at a plurality of points, for example, at four points, the supporting reaction force at each support point is Theoretically from the position of each support point and the weight distribution of the structure. Then, when the structure is actually supported at the same support point positions and the same supporting reaction force as described above, the structure is not restricted by torsion or the like from the supporting reaction force and remains in its own unique form. Will be supported. However, on the ground, the gravity causes deflection between the support points, but this can be minimized by adjusting the number or position of the support points, or by using a rigid part in the structure as a support point. It is possible to feed back to the shape recognition of the structure by analyzing the deflection amount.

Based on this principle, even if there is a manufacturing error in the concept, if the structure is supported by the same support point position and support reaction force as described above, the structure is not restricted by twisting or the like from the support reaction force, Manufacturing errors appear, and the unique form of the device is reproduced. In the present specification, the reproduction of the unique form of the structure is hereinafter referred to as "unstressed natural body" as appropriate, assuming that stress such as torsion does not act on the structure due to the supporting reaction force.

By the way, when a structure is placed on a surface plate (a rigid body and the mounting surface is flat), the structure is in a state of being adjusted to the surface plate by its own weight. Due to stress, even if there is a manufacturing error, it does not appear on the outer shape. Therefore, when the structure is simply supported at a plurality of points, the structure is supported in a state where the structure is adapted to the respective support points similar to the case where the structure is mounted on the surface plate.

As described above, in the present invention, after each structure is supported by each support device so as to support the structure in a stress-free natural state, each support device is delicately expanded and contracted, and the structure is transferred from each support device to the structure. Adjust the acting reaction force.

Embodiment An embodiment of the present invention will be described below with reference to FIG.

In this embodiment, a long main bridge block W is used as a structure. Therefore, the main bridge block W of the long bridge is briefly described first.

This long bridge main tower block (hereinafter simply referred to as “block”
As shown in FIG. 1 or FIG. 3, W is one inner cell W1 having a square cross section and two outer cells having a convex surface.
The cells W2, W2 are assembled by bolting, and the cells W1, W2, W2 themselves are welded. The block W constitutes a long bridge main tower by being connected in plural with the Z-axis direction as the vertical direction,
The upper and lower surfaces of the block W that overlaps vertically serve as touch surfaces that abut against each other. This touch surface is formed by cutting with reference to the block core in the Z-axis direction of the block W, and the upper and lower touch surfaces are abutted to connect the block W in the vertical direction to form a final long bridge. It is designed to satisfy strict machining accuracy in the main tower.

Such a block W has the following special features.

The block W is slightly twisted and deformed by the influence of distortion during processing such as welding generated in the three cells W1, W2, and W2 themselves. Naturally, the twist of the block W due to those deformations is unique and cannot be calculated. Hereinafter, the twist is referred to as “manufacturing twist”.

When the block W is placed vertically as shown in FIG. 4A, that is, when the Z-axis direction of the block W is set as the vertical direction, the block W shrinks by a small amount Δl in the Z-axis direction. Not externally restrained. Therefore, the "manufacturing twist" appears as it is. However, in the figure, the block W is simplified as a rectangular parallelepiped.

When the block W is placed horizontally as shown in FIG. 4 (b), that is, when the Z-axis direction of the block W is set as the horizontal direction, the distance between the left and right support points as shown in the center line of FIG. Calculated deflection as a beam spanned over However, since the block W has many webs and flange materials that can resist as a support beam, when the block W is symmetrically supported at a plurality of points, the deflection as the beam is extremely small, and the "twist in manufacturing" In this case, it is negligible as compared with the above, and the influence on the processing accuracy is extremely reduced. In the following, the deflection is referred to as "beam deflection". Note that the block W is also simplified as a rectangular parallelepiped in FIG.

In the case of the present embodiment, such a block W is supported by an analyzer S shown in FIG. 1 in a posture of a stress-free natural body.

In this figure, reference numeral 1 denotes an NC table (mounting table), and 2 denotes a board (temporary support) that supports the block W on the NC table 1 in advance. The dimensions of the board 2 are set so that the block W is supported higher than the NC platen 1 than the axially-reduced length of the electro-hydraulic servo cylinder (support device) 3 which is reduced to a minimum.

The servo cylinder 3 supports the block W with a rod 3b that expands and contracts from a cylinder tube 3a. A servo driver (servo valve) 5 (described later) for controlling the expansion and contraction of the rod 3b detects a protrusion output of the rod 3b. And a stroke sensor for detecting the amount of protrusion of the rod 3b. The pressure sensor is
The minimum detectable pressure is 0.25 kg / cm ² , and the stroke sensor has a resolution of 0.05 mm. Servo cylinder 3 above
Are set at a plurality of positions (eight in this embodiment) at positions where the dimensions in the block W are specified and at which the “bending as a beam” is reduced, and are controlled by the system controller 4. I have.

The system controller 4 controls the servo cylinder 3 via the servo driver 5 as shown in FIG. 2, and is connected to a total of four three-dimensional coordinate measuring devices 6 provided around the NC surface plate 1. . The system controller 4 is operated by a structural analysis program 4a and a system controller program 4b.

The structural analysis program 4a calculates a load acting on each servo cylinder 3 by inputting drawing information and inputting the position of each servo cylinder 3 with respect to the block W.

The system control program 4b controls the servo cylinders 3 to support the blocks W in place of the boards 2 by extending the rods 3a of the servo cylinders 3, and controls the servo cylinders 3 to act on the blocks W from the servo cylinders 3. The protrusion amount of the rod 3a is delicately controlled so that the force matches the calculated load.

The three-dimensional coordinate measuring device 6 includes an electronic theodolite 6a and a data processing device 6b, and confirms the shape of the block W in three-dimensional coordinates.

Next, a method for managing the reaction force of the block W with the analyzer S configured as described above will be described with reference to FIG.

First, from the ideal shape and weight of the block W on the drawing (step S1) obtained from the drawing information, the theoretical load (support reaction force) acting on each servo cylinder 3, the support position by the servo cylinder 3, and Calculate the deflection due to the load distribution (corresponding to "the deflection as a beam") (Step
S2). Further, the calculation result is printed out (step S3). Then, the receiving position of the block W is determined on the NC surface plate 1 (step S4), and the servo cylinder 3 is installed at the position printed out in step S3,
The block W is set above (step S5).

After the servo cylinder 3 and the block W are installed as described above, the rod 3b of the servo cylinder 3 is raised. Thereafter, when the distance from the block W to the upper end position of each rod 3b becomes constant, a signal is sent from the proximity switch attached to the rod 3b to the system controller, and the ascent of the rod 3b of the servo cylinder 3 is temporarily stopped. When the distance between the upper ends of the rods 3b of all the servo cylinders 3 and the block W becomes constant, all the rods 3b are raised again. Then, the upper end of each rod 3b abuts on the block W almost simultaneously. For this reason, the block W is stably
Lifted from. At this time, the pressure of the pressure oil of each servo cylinder 3 is detected by a pressure sensor, and each servo cylinder 3
Then, the actual reaction force acting on the block W is obtained from the above, and these actual reaction forces are summed to obtain the actual weight of the block W (step 6). The actual weight of the block W is compared with the ideal weight of the block W obtained in the previous step S1, and the theoretical support reaction force calculated in the previous step S2 is corrected.
The target reaction force value is set (step S7). For example, the theoretical supporting reaction force is increased or decreased by an amount corresponding to the ratio between the actual weight of the former and the weight of the latter, and is set as the target reaction force value. Thereafter, each target reaction force value is compared with the actual reaction force by the pressure sensor of the servo cylinder 3 (step S8), and ideally they are made to coincide. That is, steps S6 and S7 are repeated until the condition of step S8 is satisfied, during which time the rod 3b of the servo cylinder 3 that does not reach the target reaction force value is gradually raised. The condition in step S8 is defined as the difference (R ₀ −) between the target reaction force value R ₀ of each servo cylinder 3 and the actual reaction force R ₁ actually acting on the block W from each servo cylinder 3.
R ₁ ) falls within the range of −2% to + 2% of the target reaction force value R ₀ . As described above, the definition of -2% to + 2% is that if the value exceeds this range, the accuracy of the touch surface above and below the block W is deviated according to the error of the reaction force, and as a result, the blocks W are stacked vertically. This is because the vertical accuracy of the main tower of the long bridge deteriorates. Then, when the condition of step S8 is satisfied and the process proceeds to step S9, in step S9, the servo cylinder 3 is detected by the stroke sensor.
The position of the lower surface of the block W with which the servo cylinder 3 comes into contact is confirmed by three-dimensional coordinates. Based on these coordinates, the shape of the lower surface of the block W is output to the display screen in step S10. Thereafter, four three-dimensional coordinate measuring instruments 6 provided around the NC table 1
To obtain the coordinates of the peripheral surface of the block W and input the coordinates to the system controller 1 (steps S11 and S1).
2). Then, the shape of the block W is recognized based on the coordinates obtained by the three-dimensional coordinate measuring device 6 (step S13), and the shape of the real block W and the shape of the design ideal block are output to the display screen (step S13). S14).

According to the method for managing the reaction force by the analyzing device S configured as described above, the upper end of each servo cylinder 3 is disposed equidistant from the lower surface of the block W and then abuts on the lower surface. Thus, the support of the block W can be started. Then, there is an advantage that the block W can be supported by simple control such as stopping the movement of each servo cylinder 3 at the same time.

[Effects of the Invention] As described above, since the upper end of each support device is disposed at substantially the same distance from the lower surface of the structure and then contacts the lower surface, the support of the structure is stably supported. You can start. In addition, there is an advantage that the structure can be supported by simple control such as stopping the movement of each support device at the same time.

[Brief description of the drawings]

1 to 5 are views showing an embodiment of the present invention. FIG. 1 is a perspective view showing a main tower block of a long bridge installed in an analyzer, and FIG. 2 is a system controller and its periphery. FIG. 3 is a perspective view of the main tower block of the long bridge, FIG. 4 (a) is a schematic perspective view of the main tower block installed vertically, and FIG. 3 (b) is a long bridge. Schematic perspective view when the main tower block is placed horizontally, FIG.
(C) is a flowchart showing the procedure of the reaction force management method. 1. NC surface plate (mounting table) 2. Wood block (temporary support), 3. Servo cylinder (supporting device), 3a cylinder tube, 3b rod, W. Structure (length) Ohashi main tower block).

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuto Takeuchi 3-1-1-15 Toyosu, Koto-ku, Tokyo Ishikawa Shima-Harima Heavy Industries Co., Ltd. Tokyo Second Factory (72) Inventor Masaaki Matsuba 3 Toyosu, Koto-ku, Tokyo No. 2-16, Ishikawa Shima-Harima Heavy Industries, Ltd.Toyosu General Office 4-19-30 Kitasuna, Koto-ku 4-chome, Kitasuna 4-chome No. 504 (58) Field surveyed (Int. Cl. ⁶ , DB name) E01D 21/00 E01D 19/02 G01M 19/00 E04H 12/08

Claims (1)

(57) [Claims] In order to inspect the shape of a structure separately, the structure is supported by a plurality of supporting devices, and the reaction force acting on the structure from each supporting device is determined by the weight distribution of the structure. To be equal to the load theoretically acting on the support device,
In the method for managing the reaction force of a structure that adjusts the amount of upward projection of each of the support devices to support the structure in a posture of a natural body in which a manufacturing error has appeared, in advance, the structure is temporarily supported by a temporary support. After supporting at a predetermined height, each supporting device is simultaneously raised, and when the upper end position of each supporting device is at a certain distance from the above structure, the lifting is temporarily stopped, and all the supporting devices are stopped. After doing
A method for managing a reaction force of a structure, wherein all the supporting devices are raised at the same time, and the upper end of each supporting device is brought into contact with the structure to support the structure with each supporting device.