RU2405082C1 - Method for making of noise screen - Google Patents

Abstract

FIELD: construction. ^ SUBSTANCE: invention is intended for making of noise screens, reflecting and suppressing acoustic waves of high capacity, which are generated along with passing of high speed train sets. Method for manufacturing of noise screen, including installation of support stands in the form of double tee on foundation, and a metal plate with thickness of at least 5 mm is welded to double tee along full length of stand. Then ""-shaped section bars are fixed by SFS self-tapping screws to plate through vibration damping gasket, joining them to form sections, noiseproof material is laid into sections, and perforated metal sheet is fixed to support stand and ""-shaped section bars, covering space from stand to stand. ^ EFFECT: screen may withstand high dynamic loads, preserving high noiseproof properties at the same time. ^ 1 cl, 5 dwg

Description

The present invention relates to devices for protection against noise, and specifically to methods for manufacturing such devices. The proposed method can be used in construction to ensure a normal acoustic regime in housing estates and forest park areas, along which there are highways and highways with heavy traffic.

A known method of manufacturing noise screens in the form of a concrete wall installed along the highways / US patent No. 5406039, 1995 /.

The method consists in manufacturing a continuous concrete base throughout the protected area, installing support racks on it at a strictly fixed distance from each other, having a double tee in cross section, and laying it with a crane into the space between the supporting racks of soundproof panels, which can be either sectional or whole.

This method is too time-consuming and not technologically advanced: it requires heavy-duty transport for delivery and a crane for installation, rigging; fixing concrete blocks is difficult; the screen itself is only a reflector of sound without damping; the accuracy of manufacturing concrete blocks with connecting protrusions is doubtful even in the factory, and this leads to inconsistency of the grooves during installation.

There is another method of manufacturing noise screens by installing vertical uprights on a support base and securing on them a frame frame from sections. Acoustic sound absorbing elements of various designs and materials are built into the section

/ patents RU No. 2176005, 2176006, 2001 /.

The specified method is also not technologically advanced, as it is based on manual assembly with careful adjustment of the components making up the screen. The design itself, made by this method, is not adapted to counter high-power acoustic waves generated during the passage of trains with high speed.

The closest analogue to our proposed method is a method of manufacturing a soundproofing device by manufacturing a support base and installing support posts on it, to which acoustic elements with soundproofing material are attached. The whole structure is closed from the outer and inner sides by screens in the form of plates of different heights, overlapping the attachment points of the acoustic elements to the stands / RU patent No. 2235823, 2003 /.

The method described in the prototype is implemented on a continuous tape support base and requires a strictly fixed distance between the racks when installing them, which, as noted above, is difficult in construction practice. Attaching the structural materials constituting the screen to the support legs in a variety of ways, for example, drilling bolt holes, is difficult and can lead to a weakening of the rack. The use of multi-sized internal and external screens in the device complicates the assembly of the structure and does not allow it to be protected from atmospheric precipitation, for example by installing a visor. The use of a vibration damping pad as a fastening material in the method cannot ensure the reliability of the device to counteract force effects from shock waves of passing trains.

The objective of the invention is to develop a method for the manufacture of acoustic noise screens with increased strength and good noise barrier properties, combined with simplicity and reliability in their manufacture.

The problem is solved as follows: make the support base in the form of a point foundation for each support stand. As foundations, fast-piling metal piles or pre-fabricated point concrete racks with a deepening of the amount of freezing of the soil are used. On the foundations with the help of a bolted connection, the racks are fixed in the form of I-beam columns with a support plate welded at the base, which is installed on the foundation. The plate is connected with a stand by a welded seam, and also for giving additional rigidity by welded reinforcing ribs. A plate with a thickness of at least 5 mm is welded along the entire length of the rack to the I-beam. On this plate through a suture seal, which is a vibration damping pad, set U-shaped profiles - (hereinafter cassettes) with special grooves for coupling to each other. The suture seal has the appearance of a rubber strip. At the joints between the cassettes, a suture sealant or sealing mastic is also used, which is applied during installation. This ensures soundproofing of the overall design. The cassettes are screwed to one another, with the seal tightly pressed between the cassettes. After sealing and attaching the cassette to the plate in an I-shaped rack, soundproofing material is inserted into the cassette, and then an external screen is installed from a profiled galvanized metal sheet with perforation. The sheet is coated with a polymer coating. In the longitudinal joint, the cassettes are screwed to one another with a gap of at least 500 mm. Then the joints are sealed with a seam seal, which gives an absolutely tight seam that does not allow noise. Fixture of cartridges to support racks is made with SFS self-tapping screws. The choice of precisely these self-tapping screws is caused by their highest technical and operational characteristics. The material from which the screws are made is stainless or carbon steel with a special anti-corrosion coating. When pulling the self-tapping screw to the supporting structures, the sealing washer does not scroll. In this case, the coating of the washer itself and the finishing layer of the outer panel lining under the washer are not damaged, respectively, corrosion is eliminated at the attachment points. Thus, when tightening the screws, there is an additional back-up of the outer panel lining in the installation area of the fasteners. This connection withstands a sufficient level of pressure of external forces on the cartridge, the lining does not deform, does not move along the screw shaft, and therefore there remains a reliable fit of the sealing washer to the surface of the cartridge. This provides reliable waterproofing in the area of the self-tapping screw throughout the entire life of the soundproof structure.

After installing the cassettes, sound-absorbing material (for example, mineral wool) is laid in them. On top, on the panel, with the filler laid in them, perforated metal sheets with a polymer coating are fixed. The sheets are installed on the side of the noise source cassettes and attached to both the panels and the support posts using self-drilling screws. Sheets perform several functions in addition to noise protection; they are an element that provides structural rigidity (they pull together all the panels together), they also have a decorative function - they can be painted in various colors, carry images of advertising materials.

To protect against atmospheric precipitation, the entire structure is closed with a visor from above.

The technical result from the use of the present invention is to simplify and reduce the cost of the manufacturing process of noise shields while increasing their reliability to the dynamic effects of air shock waves and the effectiveness of noise protection.

The invention is illustrated by an example of the manufacture of the screen and drawings illustrating this process.

In any known manner, point foundations are prepared for each support column of the installed device. Support racks are prepared from I-beams: a support plate is welded on the base, and a steel plate is welded along the entire length of the beam and on both sides for subsequent fastening of the elements of the inner screen to it (Fig. 2). Support posts are exposed, attaching them to the support base, and U-shaped profiles are fixed on them, laying the gasket. The number of cassettes forming the inner screen depends on the total height of the device, but not less than 3 meters (figure 2). In the formed parallelepipedal cavity lay soundproof material (figure 3). The entire surface from the side of the noise source is closed with a perforated and profiled sheet (Fig. 4). The upper part of the entire structure is protected by a visor, and the space between the support bases is covered with a protective plate (Fig. 5, the lower plate is not shown).

The technical result from the use of the present invention is to simplify and cheapen the manufacturing process of noise shields while increasing their reliability to the power effects of air shock waves and the effectiveness of noise protection.

Claims (1)

A method of manufacturing a noise shield, including installing on the foundation of the support posts in the form of an I-beam, to the jumper of which a metal plate of at least 5 mm thick is welded along the entire length of the rack, then U-shaped profiles are fixed with SFS self-tapping screws to the plate through the vibration damping gasket, connecting them together the formation of sections, the soundproofing material is laid in the sections and the perforated metal sheet is fixed to the support column and U-shaped profiles, blocking the space from the rack to the rack.

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