JP2977428B2 - Buffer stopper between two structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a buffer stopper interposed between two structures, such as a chimney cylinder and a supporting tower in a steel chimney, or a boiler and a supporting frame in a steam generator. .

[0002]

2. Description of the Related Art FIG. 14 is a plan view showing the structure of a conventional general buffer stopper 1 interposed between two structures, ie, a cylindrical structure A and a support frame B. The shock-absorbing stopper 1 is provided with a rigid projection 2 provided on the supporting frame B side and protruding toward the cylindrical structure A, and a longitudinally fixedly provided on the outer ring frame 3 of the cylindrical structure A so as to sandwich the rigid projection 2. The cylindrical structure A and the supporting frame B are formed of a pair of groove-shaped rigid guide stoppers 4 so that the cylindrical structure A and the supporting frame B can move mutually in the vertical direction perpendicular to the plane of the drawing, and restrain the movement in the horizontal direction. They are connected to suppress individual free vibration and displacement.

[0003]

Conventionally, the above-described buffer stopper 1 is provided so as to oppose the transmission force based on the expected relative displacement by the rigidity resistance of the rigid projection 2 and the rigid guide stopper 4. I came.

However, when a large-scale transmission force Q actually generated during a large-scale earthquake or the like is encountered, the rigid projection 2 and the rigid guide stopper 4 are attached to a local portion such as a mounting portion as shown in FIG. It has been found that cracks and cuts occur due to stress concentration or strain concentration, and that it often hardly works effectively, and as a result, the cylindrical structure A and the support frame B are damaged. .

An object of the present invention is to provide a structure of a buffer stopper between structures capable of effectively acting in the event of a large-scale earthquake in response to this problem.

[0006]

In order to achieve this object, in the present invention, a buffer stopper interposed between two opposing structures is provided with the same buffer stopper.
A rigid plate is fixed to both end surfaces and one end or both ends of the metal tube portion are rigidly connected to and supported by the supporting portion of the one structure, and one end is rigidly connected to the other end or the middle of the metal tube portion. And a lever portion connected to the other structure so as to transmit the relative movement of the metal tube portion in the torsional direction to the other structure, and the relative displacement between the two structures. The torsional shear yield strength of the metal tube due to the time transmission force was set smaller than the yield strength of any other member such as the lever.

In addition, the outer peripheral portion of the metal tube near the rigid connection with the lever is rotatably supported in an eye ring fixed to the one structure so as to be capable of being twisted and deformed.

Further, the metal pipe portion has an internal restraint member capable of suppressing out-of-plane deformation of the wall surface of the pipe.

[0009]

According to the present invention, among the transmission forces generated in the buffer stopper based on the relative displacement between two opposing structures, the transmission forces other than torsion such as bending and shearing are:
The other connecting member supports and absorbs, and only the torsional moment is transmitted to the metal pipe portion, and the metal pipe portion generates a uniform shear stress over the entire pipe wall due to the torsion.

[0010] Therefore, local stress concentration leading to early fracture or the like is reduced. Furthermore, in the event of a large-scale earthquake, the metal pipe section twists faster than any of the other connecting members to reach the full-section shear yield point and plastic deformation occurs, and the transmission force is suppressed to less than the torsional yield strength. Is done. Due to the repetition of relative displacement during a large earthquake, etc., the entire metal pipe wall undergoes repeated plastic deformation, so that the vibration energy of the seismic force is absorbed by this relatively large and continuous torsional plastic work of the pipe wall. It acts as an effective damping device.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a horizontal sectional view of a structure to which a buffer stopper according to the present invention is applied. In the figure, the same parts as those in the related art are denoted by the same reference numerals as those in FIG. In FIG. 1, reference numeral 11 denotes a buffer stopper according to the present invention provided in a point-symmetrical arrangement between a ring frame 3 wound around the outer surface of a cylindrical structure A and a support frame B. The buffer stopper 11 includes a lever portion 12 having one end fixed to the ring frame 3 of the cylindrical structure A, and a guide stopper portion 13 fixedly disposed on the support frame B side so as to be engageable with the end of the lever portion 12.

FIGS. 2 and 3 are a plan view and a side view of the first embodiment of the present invention, in which one buffer stopper 11 in FIG. 1 is enlarged. In FIGS.
Reference numeral 2 denotes a metal pipe portion 16 having a high extensibility such as mild steel in which other rigid plates 16b and 16c are welded to upper and lower ends, and another metal pipe member 17a flange-connected to the upper rigid plate 16b of the metal tube portion 16. And a lever arm 17b which is welded at one end to the peripheral surface of the metal pipe member 17a and supported horizontally in a cantilever manner;
A base 1 comprising a shaft member 17c protruding and fixed downward to the tip of the lever arm 17b, and a lower rigid plate 16c of the metal tube 16 integrally connected to the ring frame 3 of the cylindrical structure A.
4 is fitted and supported in the fixed frame 15 on the other metal pipe member 17.
The upper and lower cylindrical portions a are rotatably supported by the eye rings 3 a fixed to the cylindrical structure A and the connection pieces 18. The eye ring 3a is provided on the cylindrical structure A in any form.

The upper rigid plate 16b of the vertical metal tube portion 16
Is mounted as a circular or flanged plate,
The lower rigid plate 16c is mounted as a square plate or a square ring plate.

The fixed frame 15 on the ring frame 3 and the base 14 is mounted in accordance with the shape of the lower rigid plate 16c.
Are fitted so as to be rigidly supported.

The guide stopper portion 13 is located at a position on the support frame B which allows the tip of the lever portion 12 to move by ± maximum horizontal displacement between the cylindrical structure A and the support frame B set in response to an earthquake vibration or the like. The shaft member 1 at the tip of the lever portion 12
7c is fixedly arranged as two symmetrical members so as to be able to contact and restrict from both sides.

That is, one set of buffer stoppers 11
One metal tube 16 and the other members 3, 3a, 13, 14, 15, 17a to 17 connected to this member 16
c and 18.

The transmission force Q based on the relative displacement between the cylindrical structure A and the supporting frame B generated between the guide stopper portion 13 and the shaft member 17c at the tip of the lever portion 12 in FIG.
It is supported by the pair of eye rings 3a via the lever arm 17b, and the bending moment corresponding to (Q × arm length) is transmitted to the metal pipe 16 as only the torsional moment T.

Further, in the buffer stopper 11, the shear yield strength due to the torsion of the metal tube portion 16 due to the transmission force Q generated in the buffer portion due to the relative displacement between the two structures A and B is used for the other connection. Members 3, 3a, 13, 14, 15,
The yield strength is set smaller than any of the yield strengths 17a to 17c and 18 so that the metal pipe 16 first reaches the yield point.

According to such a buffer stopper 11,
In FIG. 1, when a large relative transmission force in any direction is generated between the two structures A and B, each of the shock-absorbing stoppers 11 is provided between the lever 12 and the guide stopper 13 shown in FIG. The transmission force Q due to the relative displacement generates a lateral force Q and a torsional moment T obtained by multiplying the arm length by Q to the metal pipe member 17a, and the lateral force Q is transmitted to the eye ring 3a, and Only the torsional moment T is transmitted to the metal tube 16. As shown in FIG. 4, a shear stress τ in the torsion direction
Occur almost uniformly over the entire circumference and the entire height.

When the torsional moment T due to the transmission force Q generated by the relative displacement exceeds the shear yield point due to the torsion of the metal tube portion 16, the metal tube portion 16 first moves around the entire circumference and height in the buffer stopper 11. At the same time, shear yielding occurs almost simultaneously, without causing local strain concentration, plastic deformation occurs on the entire cross section on average, and the transmission force Q is continuously opposed.

FIG. 5 is a diagram showing the action of the metal tube 16 against the transmission force Q during plastic deformation, and the vertical axis T is the torsional moment of the metal tube 16 and is between the two structures A and B. Multiplied by the arm length to the transmission force Q, the horizontal axis δ is the amount of torsional distortion of the metal tube portion 16, and the spiral chain line in the figure is twisted based on the transmission force Q that is alternately repeated in the opposite direction. The tube portion 16 exhibits an opposing action due to plastic deformation.

The work (plastic work) due to the plastic deformation of the metal tube portion 16 absorbs seismic vibration energy and the like, so that the vibration response of the structures A and B is greatly reduced. That is, the vibration displacement is attenuated.

That is, with respect to the transmission force Q due to a large relative displacement between the two structures A and B generated during an earthquake vibration or the like, the relative displacement of the buffer stopper 11 without breaking due to local concentration of the load. In addition, it is possible to greatly reduce the response vibration between structures by utilizing the strength of the metal tube portion 16 in the sustained plastic deformation region, and to prevent damage and destruction of the structure body. Will be possible.

Further, by configuring the metal tube portion 16 in a unit in which a rigid plate is fixed to both ends, when the metal tube portion 16 has depleted the plastic deformation resistance, the metal tube portion 16 can be easily replaced in units of the metal tube portion 16. .

FIG. 6 shows a second embodiment of the present invention. This embodiment is different from the embodiment of FIG.
Is used instead of two metal pipes 16, 16 'which are rigidly connected in a two-stage stack. Lower rigid plate 16c of upper metal tube 16 and upper rigid plate 1 of lower metal tube 16 '
6b 'is mounted as a flange-like plate and fixed to each other by bolt-nut connection or welding, etc., and other portions may be the same as those in the embodiment of FIG.

According to this embodiment, the amount of plastic deformation after torsional shear yielding is increased by the length of the metal tubes 16 and 16 'in the upper and lower stages, and the torsional plastic deformation work can be increased.

FIG. 7 shows a third embodiment of the present invention. In this embodiment, three metal tubes 16, 16 ', 1 having different diameters are used.
6 ″ is kept inside and outside, and the upper and lower rigid plates 16 b, 16
c ′ are shared, and are arranged in three layers.
Is provided on the ring frame 3 on the structure A, and the outermost metal tube portion 16 "is connected to another metal tube member 17a in FIG. 1 by an upper rigid plate 16b" portion.

According to this type, it is possible to obtain a larger torsional plastic deformation work by the three metal pipe portions 16, 16 ', 16 "without increasing the overall height.

FIGS. 8 and 9 show still another embodiment of the present invention. In the embodiment shown in FIG. 8, two metal pipes 16 and 16 'having the same shape and the same plate thickness are connected to both end flanges of another metal pipe member 17a of the lever section 12, and both metal pipes 16 and 1 are connected.
The other end of 6 'is rigidly connected to the ring frame 3, 3' of the structure A, and the other metal tube member 17a is rotatably supported by the pair of eye rings 3a.

The shaft member 17c and the guide stopper 13 'shown by a dotted line in FIG. 8 are provided when the shaft member 17c protrudes vertically and symmetrically and the guide stoppers 13 and 13' are arranged vertically symmetrically. A modification is shown.

The embodiment shown in FIG. 9 is similar to the above-described two metal tube portions 1.
6, 16 'are formed as an integral tube, and a rigid reinforcing plate 20 is provided inside the center.
And this portion is replaced with another metal tube member 17a.

According to the form in which two symmetrically arranged metal tube portions 16, 16 'are provided as shown in FIGS. 8 and 9,
Since the torsional moment T (Q × arm length) due to the transmitted force Q can be shared by T / 2 by the two metal tube portions 16, 16 ', the cylindrical tube portions 16, 16' can be made compact. it can. In addition, since the torsional deformation occurs in a mutually balanced manner, it is possible to obtain a more uniform torsional plastic deformation work.

In the embodiment shown in FIGS. 8 and 9, the shaft member 17c comes in contact with the vertically symmetric guide stoppers 13 and 13 'as shown by the dotted line in FIG. When the transmission force Q is input on the central axis, the bending moment of the transmission force Q is not applied to the lever arm 17b.
The support of the part by the eye ring 3a can be omitted.

Next, FIG. 10 shows a wall surface 1 of a general cylindrical pipe which is generated when the above-mentioned metal pipe part 16 is subjected to large plastic deformation.
The state of the out-of-plane deformation 16f 'of 6f is shown. In each of the buffer stoppers having the above-described structure, when a transmission force other than the torsional moment T enters the metal pipe portion 16 due to a slight manufacturing error or the like, an out-of-plane deformation 16f 'as shown in the drawing is generated, and this out-of-plane deformation 16f' is generated. 16f 'may reduce the yield strength after torsion yielding of the metal tube portion 16.

FIGS. 11 to 13 show examples of the structure of the metal tube portion 16 for suppressing and preventing the out-of-plane deformation 16f 'occurring in the metal tube portion 16. FIG. 11 shows a case where an internal restraining body (insertion tube) 21 made of the same material as the metal tube portion 16 or another rigid material inserted and held in the metal tube portion 16 with a small gap therebetween is provided.

FIG. 12 shows an internal restraining member 21a made of mortar, concrete, sand, or the like filled or hardened into the metal tube portion 16 through a hole 22 formed in the center of the upper rigid plate 16b of the metal tube portion 16. Is the case.

FIG. 13 shows a case where the thickness of the metal tube 16 itself is reduced, and an internal restraining member 21b made of the same material as a reinforcing ring is provided on the inner peripheral surface of the metal tube 16 at a constant pitch. is there.

By providing the internal restraining members 21, 21a, 21b for preventing out-of-plane deformation as shown in FIGS. 11 to 13, the buffer stopper of each embodiment shown in FIGS. In addition, the vibration displacement can be attenuated against the transmission force between the structures with more stable elastic-plastic torsional deformation resistance.

The structure of the present invention is not limited to the above-described embodiments, and the shape and combination of each member may be changed in design as appropriate. Some of them can be freely applied in any vertical and horizontal directions and between any structures.

[0040]

As is apparent from the above description, the present invention relates to a buffer stopper interposed between two opposing structures. Or, at both ends, a metal tube portion rigidly connected to and supported by the support portion of the one structure, and one end is rigidly connected to the other end or the middle of the metal tube portion and extends to the other structure side to extend the other end. A lever portion connected to transmit the relative movement of the metal tube portion in the torsion direction to the other structure,
By setting the torsional shear yield strength of the metal pipe portion due to the transmission force at the time of relative displacement between the two structures to be smaller than the yield strength of any other member such as the lever portion, a large value occurs between the two structures. With respect to the transmission force of the relative displacement, it eliminates the local concentration of the load on each part of the buffer member, and utilizes the continuous elastic-plastic deformation work due to the twisting of the metal pipe member, and the buffer member can be driven by a large relative displacement So that
Reduces response vibration due to transmission force between structures, prevents damage and destruction of the structure body, and allows easy replacement of metal pipe members when torsional plastic deformation resistance is exhausted. I made it. In addition, the outer peripheral portion of the metal tube portion near the rigid connection point with the lever portion is rotatably supported by the one of the structures in a rotatable manner within the eye ring. An external force other than the torsion in the transmission force Q is prevented from being transmitted, and the accuracy of the torsional plastic deformation response of the metal tube is improved. In addition, the metal pipe portion,
By providing an internal restraint that suppresses out-of-plane deformation of the wall of the pipe, out-of-plane deformation that occurs in the metal pipe section is reliably prevented, and these effects are combined to increase the reliability of the device. And extremely useful.

[Brief description of the drawings]

FIG. 1 is a plan view of an application example of a buffer stopper according to the present invention to a structure.

FIG. 2 is an enlarged plan view of a portion II of FIG. 1 according to the first embodiment of the present invention.

FIG. 3 is a side view taken along the line III-III in FIG. 2;

FIG. 4 is an explanatory diagram of a torsional moment T and a shear stress τ applied to a metal cylindrical tube portion.

FIG. 5 is a diagram showing a state in which a metallic cylindrical tube responds to a transmitting force during plastic deformation.

FIG. 6 is a side view of a second embodiment of the present invention.

FIG. 7 is a side view of a third embodiment of the present invention.

FIG. 8 is a side view of a fourth embodiment of the present invention.

FIG. 9 is a side view of still another embodiment of the present invention.

FIG. 10 is an explanatory diagram of out-of-plane deformation occurring in a metal cylindrical tube portion.

FIG. 11 is a longitudinal sectional view of an embodiment of an out-of-plane deformation preventing portion of the present invention.

FIG. 12 is a longitudinal sectional view of another embodiment of the out-of-plane deformation preventing portion of the present invention.

FIG. 13 is a longitudinal sectional view of still another embodiment of the out-of-plane deformation preventing portion of the present invention.

FIG. 14 is a plan view showing a combination of a conventional rigid cushioning stopper and a structure.

FIG. 15 is an explanatory diagram of a transmission force and a stress of a conventional rigid cushioning stopper.

[Explanation of symbols]

Reference Signs List A cylindrical structure B support frame 3 ring frame 3a eye ring 11 buffer stopper 12 lever portion 13 guide stopper portion 14 base 15 fixed frame 16, 16 ', 16 "metal tube portion 16f wall surface 16f' out-of-plane deformation 6b, 16b ', 16b ″, 16c, 16c ′ Vertical rigid plate 17a Other metal pipe member 17b Lever arm 17c Shaft member 20 Rigid reinforcing plate 21, 21a, 21b Internal restraint 22 Hole Q Transmission force based on relative displacement T Torsional moment δ Torsion distortion τ shear stress

──────────────────────────────────────────────────続 き Continuing from the front page (72) Yoshihide Murase, Inventor 4-2-2 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory No.6-22 Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Tetsuhiko Aoki 2-23 Daishin Corp., 2-23, Meito-ku, Nagoya-shi 301 (58) Field surveyed (Int.Cl. ⁶ , DB name) E04H 9 / 02 E04H 12/28

Claims (3)

(57) [Claims] 1. A buffer stopper interposed between two opposing structures, the buffer stopper having rigid plates fixed to both end surfaces thereof and having one end or both end portions thereof attached to a support portion of the one structure. A metal pipe portion rigidly connected and supported, and one end rigidly connected to the other end or intermediate portion of the metal pipe portion, extending to the other structure side, and the other end torsion direction of the metal pipe portion with respect to the other structure. And a lever portion connected so that relative movement can be transmitted. The torsion shear yield strength of the metal tube portion due to the transmission force at the time of relative displacement between the two structures can be reduced by any of the other members such as the lever portion. A buffer stopper between two structures characterized by being set smaller than the proof stress. 2. An outer peripheral portion of the metal pipe portion near a rigid connection point with a lever portion is rotatably supported by an eye ring fixed to the one structure so as to be capable of torsional deformation. The buffer stopper between two structures according to claim 1. 3. The buffer stopper between two structures according to claim 1, wherein said metal tube portion has an internal restraint member for suppressing an out-of-plane deformation of a wall surface of the metal tube portion.