FI75208B - TAKBRUNN. - Google Patents

Description

! 75208

Roof well - Takbrunn

The invention relates to a roof well comprising a cylindrical trough with an axial downcomer formed at the bottom and an upper collar formed in the wall of the trough, an approximately L-shaped clamping ring of cross-section for attaching the roofing material on the collar, the perpendicular arms being connected by a screw or retaining connection with the wall of the trough, an annular inner part is arranged at the clamping ring, and a plurality of elements extending above the clamping ring are distributed on the circumference of the inner part.

CH patent publication 505 965 discloses a roof well of the above-mentioned type with a sand trap ring formed of an inner ring and an outer ring. Under the inner ring, pins are arranged by means of which the sand trap ring is mounted on top of the L-shaped clamping ring, while on the upper surface of the outer ring there are elements which are parts of a grid with a through-going upper strip. The openings in the outer ring of the sand trap ring are not sufficient to allow larger amounts of water to flow through it, so that for larger amounts of water, water flows over the sand trap ring. These elements also do not prevent eddy currents associated with larger amounts of water. In the case of eddy currents, air is entrained. In the known roof well, the water also falls unhindered into the downcomer, whereby larger amounts of water create a suction which also entrains the air into the water stream. Adapted air produces loud noises in the downcomer. Also, as the amount of water decreases, deafening noises can occur if, due to the water flowing down, a lot of air is suddenly drawn from the sand trap ring, which is no longer full of water.

The object of the invention is therefore to form a roof well of the same type in such a way that the formation of sounds even when large or small amounts of water flow is as small as 2 75208.

This object is solved by means of a roof well as shown in the characterizing part of claim 1.

When large amounts of water flow into such a roof well, the passage of air is significantly prevented. The water flow is forced into radial flows by means of radially arranged strips or cams, whereby the formation of vortices is prevented. At the same time, the parts in the water path reduce the kinetic energy in stages, namely first by means of a circumferential upper flange and then by a bottom part without holes. As water flows, a water curtain is constantly maintained between the top flange and the bottom part without holes, which is also maintained when small amounts of water flow. The intake air generated when the water flow subsides can then take water from this water curtain, which mixes with the air flow like a perlator and dampens the gurgling sounds.

Due to the non-vortex outflow of water, the cross-section of the downcomer also becomes better utilized than in the case of rotating water flow, which due to the centrifugal force accumulates mainly on the walls of the downcomer and entrains air in the central part.

Claim 2 discloses a preferred embodiment of such a manhole. In the roof well thus formed, the annular inner part is kept as a shoulder of the trough wall and between the vertical branch of the L-shaped clamping ring. This makes it possible to install or remove the annular inner part after the L-shaped clamping ring has been removed.

An embodiment of the invention will now be described with reference to the accompanying drawings, in which:

Fig. 1 shows a top view of a prefabricated roof well according to the invention, Fig. 2 shows a section taken along line II-II in pattern 1.

Figure 3 shows on a larger scale a partial section of Figure 2.

The roof well comprises a trough 10, an annular inner part 20 and a clamping ring 16. The above-mentioned parts are made of plastic.

Tray 10 is a circular cylinder. A protrusion is formed at its bottom, to which a downcomer 11 is axially connected. A shoulder 12a is formed at the height of the upper third of the trough wall. The diameter of the wall 12b above it is larger than the diameter of the lower part of the trough.

A partially conical, partially planar collar 13 begins at the trough wall 12b. The trough 10 is cast into a concrete roof after it is connected to a downcomer. The roofing material 14 is on the collar 13 and can also be pulled some distance down the wall 12b.

The clamping ring 16 secures the roofing material at the collar 13. The cross section of the tension ring has a horizontal branch 16a and a vertical branch 16b. A connection is made between the vertical branch 16b and the trough wall 12b with either threads or retaining members, which causes the roofing material 14 to be attached to the collar in a manner known per se. A sealing ring 17 is also arranged at the branch point of the fastening ring 16. The inner diameter of this seal is also approximately equal to the diameter of the trough wall below the shoulder 12a.

The inner part 20 consists of a base 25 with a hole 26 in the middle and several other holes 27. The base is extended outwards into a lower flange 21, which may be formed round or made intermittent. Attached from the top to the bottom is a cylindrical wall 22 75208 which extends upwards into an inwardly directed planar flange 23.

On top of the upper flange 23 there are a plurality of strips 24 arranged radially and extending upwards at least above the horizontal branch 16a of the clamping ring. In this application example, six such lists are arranged in each quarter.

As an alternative to the strips 24, as shown in Fig. 1, cylindrical cams 28 formed on the flange 23 can also be used. Another alternative is to form the cams 28 and the strips 24 alternately.

For manufacturing reasons, the base 25 with the lower flange member 21 and the associated cylindrical wall part form one shaped body, while the second shaped body consists of an upper flange 23 and radial strips 24. However, these shaped bodies are firmly connected to each other as a functioning roof well.

Elongated holes 27 are formed in the periphery of the base 25 and a plurality of holes 26 are formed in the central portion of the base. As the rain subsides, the flow of water is limited as a water curtain from the edge of the flange 23 to the bottom area 25a without holes. Only from there does the water enter the bottom of the trough through the holes. It has been found that the development of noise in this device is minimal even when the amount of water entering decreases as the rain subsides.

Claims (2)

A manhole comprising a cylindrical trough (10) having an axial downcomer (11) formed at the bottom and an upper collar (13) formed in the trough wall (12b) for attaching a roofing material (14) on top of the collar (13). an approximately L-shaped clamping ring (16) having perpendicular arms (16a, 16b) connected by a screw or retaining connection to the wall (12b) of the trough (10), an annular inner portion (20) and an inner portion (20) disposed at the clamping ring (16); ) a plurality of elements (24, 28) extending above the clamping ring (16) are distributed on the circumference, characterized in that radial strips (24) or cams (28) are arranged on the upper, inwardly extending flange (23) in the inner part (20), that the inner part (20) is provided with a multi-hole base (25), that the holes (27, 26) are arranged in the circumferential part of the base (25) and in the middle part of the base, and that there is a bottomless part (25a) between these two base parts , that the water flowing over the upper inwardly extending flange (23) hits the bottom part (25a) without holes. Roof well according to Claim 1, characterized in that an outwardly projecting flange (21) or a plurality of cams are formed in the lower part of the inner part (20), which rest on the wall (12a) of the trough (10) and are held in place by a clamping ring (16). ) vertical branch (16b).