JPH01284671A - Vibration damping structure for temporary construction material - Google Patents

Abstract

PURPOSE:To prevent noise by outwardly inserting multiple ring bodies with a large loss due to internal friction and made of a raw material with durability at an interval in the middle of the periphery of a temporary construction material such as a single tube. CONSTITUTION:Multiple vibration damping rings 2 are outwardly inserted at the preset interval on the periphery of a tube body 1. The ring 2 is formed with a raw material such as urethane rubber having a high vibration attenuation factor and excellent durability, it is laterally movably fitted in slight contact with the outer periphery of the tube body 1. The shock sound generated when the tube bodies 1 collide with each other or with other members is reduced. The high-frequency sound of 1,000-8,000Hz is effectively reduced, the breakage or damage of a temporary construction material or the like can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a vibration damping structure for temporary construction materials having excellent vibration damping and sound absorbing properties.

<Prior art> High-pitched falling and collision sounds are generated at work sites when temporary materials are unloaded, assembled, and dismantled. Measures to counter the noise generated when handling temporary construction materials are becoming increasingly important.

It is known that this type of noise has a high frequency range of 1,00011z to 8,00011z, which is most irritating and unpleasant to human hearing, and reverberates over a wide area.

Therefore, proposals for noise reduction techniques for these temporary construction materials are currently in great demand.

<Problems to be Solved by the Present Invention> The above-described conventional noise countermeasures for temporary construction materials have the following problems.

(b) Due to noise pollution from temporary construction materials, construction time will be restricted and the construction period will be extended.

(b) For sites where silence is particularly important, soundproofing tents and sheets are placed around the site.

However, with this countermeasure, the soundproofing effect is low, and
Soundproofing takes time.

OBJECTS OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide the following soundproof structure for temporary construction materials.

(a) A damping structure made of temporary materials that has excellent soundproofing effects against high-frequency sounds.

(b) A damping structure made of temporary materials that can reduce manufacturing costs.

(c) A damping structure made of temporary materials that can shorten the construction period.

<Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

(a) Sound absorption principle When a shock is applied to a steel pipe, the vibration generated within the steel pipe is 5,
It propagates at a speed of 400 m/See and attenuates while repeating reflections at both ends of the steel pipe.

At this time, a standing wave with a specific frequency is generated due to the overlap of the traveling wave traveling from the impact point toward the end and the reflected wave from the end.

In particular, in the case of a rod such as a single tube, among the vibration properties,
It is known that a reference vibration with both ends free as shown in FIGS. 3 to 5 is exhibited.

According to the figure, it can be understood that peaks of amplitude are always formed at both ends of the single tube in any frequency range, and the positions of the peaks and nodes in the middle differ depending on the natural frequency of the single tube.

In view of the point 1, the present invention provides, in view of the point mentioned in 1,
A ring-shaped vibration damping ring having vibration damping properties is fixed to suppress high frequency vibrations.

(B) Vibration damping ring (Fig. 1.2) In this embodiment, a case where the temporary material is a pipe body 1 such as a single pipe will be explained.

A plurality of damping rings 2 are mounted on the circumferential surface of the tubular body 1 at predetermined intervals for the purpose of damping and buffering the tubular body 1 .

The damping ring 2 is attached to the tube body 1 as shown in an enlarged view in FIG.
The ring body has an inner diameter that allows for lateral movement while lightly abutting against the outer peripheral surface of the ring body, and is made of a material such as urethane rubber or Teflon that has a high vibration damping rate and excellent durability.

The cross-sectional shape of the damping ring 2 may be either circular or elliptical.

Further, the cross-sectional thickness of the vibration damping ring 2 is determined in consideration of strength against breakage and manufacturing cost, but is preferably about 5 mm to 7 mm.

Further, the installation interval of the damping rings 2 is, for example, 800 mm to 1
000 mm is desirable.

It goes without saying that the damping ring 2 can be applied not only to single pipes but also to temporary materials such as square pipes.

As described above, if a plurality of damping rings 2 are attached to the circumferential surface of the tube 1, impact noise will be suppressed when the tubes 1 collide with each other or with other members. occurrence is reduced.

The vibration damping performance will be described later.

Furthermore, since the damping ring 2 also has a buffering function, it alleviates damage to other members and damage to the tube body 1 itself.

When the installation position of the damping ring 2 overlaps with the clamp installation position, the damping ring 2 is moved laterally along the circumferential surface of the tube body 1 and installed.

[Vibration Damping Effect] −4= W was made with and without the vibration damping ring 2 mounted on the outside under the above conditions in the middle of the pipe body 1, and the sound reduction effects of both were compared.

The comparison results are shown in FIG.

In the figure, white circles indicate the tube body provided with the damping ring 2, and black circles indicate the sound reduction effect of the tube body provided with the damping ring 2.

From the same figure, the tube body 1 of the present invention provided with the damping ring 2 is 1
, 00011z to 8,000Hz can be more effectively reduced.

Effects of the Present Invention> Since the present invention is as explained above, the following effects can be obtained.

(a) By simply attaching damping rings at predetermined intervals along the circumferential surface of temporary materials, vibrations can be reduced from 1.00011z to 8.00z.
Since the 0Hz (b) vibration damping ring has both a vibration damping function and a shock buffering function, it can prevent breakage and damage to temporary construction materials and other members.

(c) Since the generation of noise can be suppressed even in quiet residential areas, there are no restrictions on work time, and it is possible to shorten the work period compared to conventional methods.

(2) Since the buffer ring is movable laterally on the circumferential surface of the temporary member, the mounting position can be changed freely as necessary.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the present invention, and is a vertical cross-sectional view of the tube body Fig. 2: The entire vibration damping ring is partially broken off Fig. 3 to 5 Fig. 2 Standard vibration of a rod whose both ends are free Figure 6: Explanatory diagram of comparison results of vibration damping effects with and without damping ring

Claims (1)

[Claims] (1) A vibration damping structure for temporary materials such as a single pipe, in which multiple ring bodies made of a durable material with high loss due to internal friction are sheathed at intervals along the circumference of the material.