WO2001049952A9

WO2001049952A9 - A sound-insulating partition wall

Info

Publication number: WO2001049952A9
Application number: PCT/SE2000/002699
Authority: WO
Inventors: Jan Stroemberg
Original assignee: Bpb Pcl; Jan Stroemberg
Priority date: 1999-12-30
Filing date: 2000-12-29
Publication date: 2002-09-06
Also published as: NO20006721D0; EP1242697A1; WO2001049952A1; SE9904864D0; AU2719901A; EP1113116A2; NO316327B1; EP1113116A3; NO20006721L

Abstract

A sound-insulating partition wall comprises vertical studs (2) at a distance of about 40-60 cm from each other, at least one wallboard (3), preferably a gypsum wallboard, attached at each side of the stud, and optionally mineral wool wholly or partly filling the cavity between the studs. Each stud of bent sheet steel has two parallel flanges (12, 13) and an intermediate web (14-18), being retracted at at least half the length between the flanges (12, 13) a distance that is between 1/3 and 2/3 of the width of the flanges.

Description

A SOUND-INSULATING PARTITION WALL

Technical Field

The present invention relates to a sound-insulating partition wall or interior wall in a building. Background of the Invention Partition walls are often composed of a framework provided at both sides with wallboards, preferably gypsym boards. It is well known that such walls may give a poor and unsatisfactory sound-insulation between neighboring rooms. Many methods of improving the sound-insulation for such walls have been tried, but very often the result is either not satisfactory in terms of the sound-insulation obtained or too expensive in view. of high cost for the involved materials and/or for the labour. The Invention A better result in terms of sound-insulation and cost is according to the invention attained by a partition wall, comprising vertical studs at a distance of about 40- 60 cm from each other, at least one wallboard, preferably a gypsum wallboard, attached at each side of the stud, and optionally mineral wool wholly or partly filling the cavity between the studs, wherein each stud of bent sheet steel has two parallel flanges and an intermediate web (14-18) , being retracted at at least half the length between the flanges (12, 13) a distance that is between 1/3 and 2/3 of the width of the flanges .

Other features of the wall of the invention appear from the other claims as well as the description below and the appended drawings . The Drawings The invention will be further described below reference being made to the accompanying drawings, in which Fig 1 is a perspective and partly broken-away illustration of a conventional wall construction,

Fig 2 is a cross section through a wall stud for use in a wall construction according to the invention, Fig 3 in a cross section shows two studs according to Fig 2 brought together,

Fig 4 shows a possible slot pattern in the web of the stud along the arrows IV-IV in Fig 2,

Fig 5 is an end view showing a number of studs according to Figs 2 and 3 packed for transport,

Fig 6 shows the movement pattern of a stud according to Fig 2 when exposed to a point load acting on a flange of the stud perpendicularly to a web thereof, and

Fig 7 shows an alternative to the wall stud shown in Fig 2.

Detailed Description of a Preferred Embodiment

A conventional partition wall or interior wall is shown in Fig 1. It consists of channels 1 of cold formed sheet steel for attachment to the floor and the ceiling in a building, substantially vertical studs 2, which also are made of cold formed sheet steel or the like and are attached between the channels 1, and at each side of the framework thus formed one or more wallboards 3 attached thereto, normally by screws. The wallboards 3 are often conventional gypsum boards. The cavity in the framework between the wallboards 3 can be wholly or partly filled with insulating material, such as mineral wool. In this case the studs 2 have a conventional C-profile.

The distance between consecutive studs 2 may normally be in the region of 400-600 mm. A conventional gypsum board may have a thickness of 10-18 mm.

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stiffness increase may be in the order of 18% and the strength increase in the order of 31% in terms of bending moment .

Fig 7 shows an alternative stud with the flanges oppositely directed. The pileability of studs as shown in Fig 7 is quite as good as for studs of Fig 2. Also in other respects the advantages for this alternative stud are the same as those for the stud of Fig 2.

Normally, an increased pliability and weakness of a stud can lead to an improved sound insulating capability of a wall construction, in which the stud is used. It is therefore a surprising effect of the stud as shown and described that its sound insulating capability in a wall construction is increased. Comparative laboratory measurements on partition walls as defined above were made according to ISO 140-3 and evaluated according to EN-ISO 717-1, resulting in so called R_w-values for the walls, indicative for their sound- insulating capabilities. A higher value (in dB) means a better sound-insulating.

All wall measurements were made with two standard gypsum boards, each with a thickness of 12.5 mm, on each side of a framework containing studs. Measurements were in all instances first made on a certain wall with a stud as shown and described and then with a conventional stud with so called C-profile.

A first measurement series was made with studs having a profile height of 70 mm and a second one with a profile height of 95 mm, in the latter case in certain instances with studs having perforated or slotted central web portions. Measurements were made without and with mineral wool insulation of different thicknesses (ranging from 30 mm to 95 mm) . The R_w-values with studs as shown and described herein ranged from 48 to 58 dB and with conventional studs from 42 to 54 dB . For comparable stud pairs the improvement in sound insulation ranged from 2 to 6 dB, with a mean value of 4.3 dB . A small additional improvement in this respect was attained with perforated or slotted web portions. A thicker mineral wool insulation improves the sound-insulation both for studs as shown and described herein and conventional studs with C-profiles.

Claims

1. A sound-insulating partition wall, comprising vertical studs (2) at a distance of about 40-60 cm from each other, at least one wallboard (3) , preferably a gypsum wallboard, attached at each side of the stud, and optionally mineral wool wholly or partly filling the cavity between the studs, wherein each stud of bent sheet steel has two parallel flanges (12, 13) and an intermediate web (14-18) , being retracted at at least half the length between the flanges (12, 13) a distance that is between 1/3 and 2/3 of the width of the flanges.

2. A wall according to claim 1, wherein the flanges (12, 13) extend in the same direction.

3. A wall according to claim 1, wherein the flanges are oppositely directed.

4. A wall according to claim 1, wherein the profile height or total web length of the stud (2) is 70- 150 mm and its flange width 30-60 mm.

5. A wall according to claim 1, wherein the central web portion (18) is perpendicular to the flanges (12, 13) and imaginary prolongation lines from said web portion cross the flanges within a few mm from its respective center points.

6. A wall according to claim 5, wherein the web portions (14, 15) at the flanges (12, 13) have a combined length which is less than the length of the central web portion (18) .

7. A wall according to any of the preceding claims, wherein the sheet steel thickness of the stud is maximum 0.5 m .

8. A wall according to any of the preceding claims, wherein the stud in a central web portion (18) is provided with slots (19), holes or perforations.

9. A stud for use in a wall according to any of the preceding claims .