SU1203212A1 - Building structure - Google Patents

Description

The invention relates to the construction, in particular to the construction of interior walls or floors, to which sound insulation requirements are imposed.

The purpose of the invention is to increase sound insulation.

FIG. 1 shows the building structure, general view; in fig. 2 is a section A-A in FIG. one .

The building structure contains a concrete slab, made with sections 1 - 3 parallel to one of its sides, in this case parallel ends of the slab, which have increasing values of l lP concrete, where S is the modulus of elasticity, I is the density of concrete. In this case, the ratio -J- of the adjacent areas of the pl is not less than 1.1.

In the process of the proposed construction, under the action of a sound wave, flexural waves appear at each site of the plate.

The lengths of bending waves at each site, due to differences. The o / p of these plots are different from one another:

L.

21Th

E5

 one

) de - density, kg / m;

Eg is the modulus of elasticity, Pl; jU. - Poisson's ratio of concrete;

h is the plate thickness, m; f - sound frequency, Hz,

From this it follows that if at one of the plate sections the trace of the air sound wave coincides with the length of the flexural wave of the same frequency (and this is a necessary condition of spatial frequency resonance, as a result of which the sound rises), this coincidence is impossible in other areas. Thus, the spatial frequency resonance covers only one part of the plate, while its other parts make forced oscillations with a much smaller amplitude. As a result of this, the proposed design has a lower vibration velocity, averaged over the area of the panel, at each of its own frequency, compared to a uniform structure over the area. The consequence is a breakdown in airborne sound insulation.

The number of plate sections with different values, respectively, their width is chosen, based on the strength and rigidity conditions of the structure, as well as manufacturing technology. To obtain the effect, two plots in the slab are sufficient.

0 An increase in their number leads to an improvement in sound insulation.

The proposed construction can be made either in horizontal form or formwork, or in

5 vertical cassette or formwork. In the first case, the form is divided into compartments, for example, removable partitions, and in each compartment concrete is placed, which has

0 ratio fo / j.

When molding slabs in vertical cassettes or formwork, concrete with a low concentration of expanded clay can be used (ratio

5 of the bulk volume of the fine aggregate - quartz sand - to the sum of the bulk volumes of the small n large aggregate is equal to

N m + s

 0.65 0

five

0

five

0.75). This concrete noticeably changes its physico-mechanical properties depending on the magnitude of the pressure of the overlying layers and the intensity of vibro-compaction, which vary in height of the cassette. As a result, it is possible to produce a slab with an E5 ratio varying over its area.

 The study of expanded clay concrete panels (from concrete containing 70% of quartz sand in the amount of bulk volumes of fine and coarse aggregates), made in a cassette form, shows that in the upper

.- 1-132ompomp§ - o

  1720 kg / m -O -cPgl

in the middle part. - R 1770 kg / m

plate parts 8.98 ,. kg / m

and at the bottom

one§

50 18 OOMPa 9.95 MPa kg / m kg / m

Thus, the stove can be considered as consisting of three sections, with the ratio of adjacent areas being 1.1.

Full-scale tests of the interroom walls of panels 20 cm thick, of

claydite. having specified

f with

a change in the ratio — in height — indicates that the actual insulation index of airborne noise is 1 52.4 dB, which is 2 dB more than the value determined for the system from a uniform claydite-concrete panel with average actual values

C

Compiled by A. Maslov Editor N. Tupitsa Tehred O. Nets

8395/36 Circulation 695 Subscription

VNIRSHI State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, ul, Proektna, 4

values of density and modulus of elasticity (P 1770 kg / m, 59x10 ° Pa; thus, the use of a panel with varying area, from f ft ij.-

Wearing the Oetone allows the wall thickness to be reduced while ensuring the required sound attenuation (15 50 dB).

2 figg.

Proofreader T. Kolb

Claims (1)

CONSTRUCTION CONSTRUCTION, including a concrete slab, characterized in that, in order to improve sound insulation, the slab is made of at least two parallel sections of one of its equal sections, ^ δ / concrete of which differ by at least 1.1 times, where Eg is the modulus of elasticity, is the density of concrete. FIG. 1