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    • 4. 发明专利
    • SOUNDPROOF FLOOR
    • JPH01318657A
    • 1989-12-25
    • JP15172988
    • 1988-06-20
    • KAJIMA CORP
    • HOSONO TOSHIROTAKEI YOSHIKAZUABIKO AKIHISATANO MASANORI
    • E04F15/18E04F15/20
    • PURPOSE:To reduce harmful effect of vibration and radiant sound by placing a dynamic vibration absorber, composed of an added load and spring stands, to the upper floor side in a space beneath the upper floor supported above a floor slab, and by making the absorber coordinated to the natural frequency of the floor slab. CONSTITUTION:An upper floor 3 is laid above a floor slab 1 through vibration isolating rubber stands 5, joists 4a (for span) and joists 4b (for connection). A dynamic vibration absorber with a rigid added load 7, made from a concrete block or the like, supported by spring stands 8 and further supported by supporting instruments 11, is laid in a space beneath the floor. By such arrangement, adjustment coordinative to the natural frequency of the floor slab can be made and, because of this, radiant sound 10 produced by impulsive shaking force 9 can be reduced. Thereby, a soundproof floor structure that reduces vibration and radiant sound harmful to the residents of the upper and lower stories can be obtained.
    • 7. 发明专利
    • DAMPING APPARATUS OF BUBBLE BATHTUB
    • JPS6485651A
    • 1989-03-30
    • JP24496187
    • 1987-09-29
    • KAJIMA CORP
    • NOZAWA TADASHIOTOMO HISAYATANO MASANORISUZUKI TADAOTSUCHIYA HARUO
    • A47K3/16A61H23/00
    • PURPOSE:To keep sonically good living environment by reducing the noise and vibration generated from a bubble bathtub and to anchor said bathtub to a multiple dwelling house, by arranging the bubble bathtub on a damping stand having a heavy wt. and arranging said damping stand to a base through a damping member. CONSTITUTION:A damping stand 5 has damping effect as the wt. thereof is increased and has effect in an aspect reducing the up-and-down behavior of the upper peripheral part of the bathtub when the loads of water and a person are added. Therefore, a cross-sectional shape increasing the wt. of the stand as heavy as possible by making only the part directly above the arrangement place of vibrationproof rubber is employed and a pan-shaped box 9 made of stainless steel for rust inhibition is filled with concrete 10. The planar shape of the damping stand 5 is determined corresponding to the shape of a bathroom and is not especially restricted and the bathtub 7 is placed on the damping stand 5. The vibration proof rubbers 4 arranged at 6-8 places by calculating a center-of-gravity position on the basis of the shape of the damping stand 5 are made of rubber having high water resistance and said stand 5 is constituted by arranging ones having an almost S-shaped structure in order to reduce the shaking in a horizontal direction to make the spring constants equal in vertical and horizontal directions.