FI70958B - LOCKRAM FOER BRUNNAR I ANSLUTNING TILL UNDERJORDISKA KANALER - Google Patents

Description

1 70958

The present invention relates to a cover frame for wells associated with underground ducts 5, which cover frame comprises an annular collar to be fitted to the surface of the coating layer surrounding the passage opening and a sheath-like skirt 10 integral with the collar to form a base extension to the foundation, wherein the collar has a substantially annular planar surface resting against the coating layer of the well and an annular recess radially inside it.

Such a cover frame is disclosed in Finnish Patent Application No. 811858. The purpose of the annular recess on the underside of the collar is to form an annular shoulder of the penetrating coating material which holds the collar horizontally in a firm grip with the coating layer.

20 This is also the case when the coating material is a fast-curing grade used in warm weather.

During cold weather, on the other hand, it is necessary to use a slower coating material for street and road repairs, which hardens only in two to three days. Achieving the desired result would require traffic being blocked at the repaired street section until the paving material has finally hardened, but this is very rarely possible. As a result, as the coating still hardens, as the vehicles drive over the cover 30, the coating is squeezed out from under the collar, forming a protrusion in front of the cover frame, and the wheels of the overdrive vehicles strike the cover frame more and more hard as a result of this protrusion. Before the coating material hardens, the cover frame often has time to settle so much, usually with a sa-35 club tilt, that a new repair must be carried out.

The object of the invention is to provide a new cover frame which eliminates the above-mentioned drawback.

2 70958

The cover frame according to the invention is characterized in that openings extending through the collar are formed in the annular recess, in order to substantially prevent the cover frame from sinking and tilting under the action of the overloading guides when the coating layer has not yet completely solidified.

The openings are preferably located at the inner edge of the annular recess; their number and shape may, of course, vary.

10 Naturally, some coating material is squeezed through the openings in the collar, but the amount is less than the amount of material previously squeezed under the edge of the collar.

More importantly, however, it is not possible to form a protrusion in front of the cover frame, from which the wheels 15 of the vehicles strike the cover, and as a result the total descent of the cover frame is decisively reduced. In addition, the openings reduce tilting and improve the final grip of the cover frame on the coating layer. The holes in the cover frame are also useful in that they can be used to check whether the installation work has been carried out correctly or not, i.e. whether there are incompletely coated areas under the collar.

The invention will now be described with reference to the accompanying drawing.

Figure 1 shows a vertical section of the cover frame and the concrete structure of the well installed on the street.

Figures 2 and 3 show the cover frame in a larger size in partial axial section and seen from above, respectively.

Figure 1 of the drawing shows a sewer inspection or rainwater well comprising a mainly concrete structure 1 and a cover frame 2 forming an extension above it. The concrete structure 1 consists of overlapping concrete rings 3. The cover frame 2 comprises 5. A collar is formed at the top of the cylindrical skirt 6. The cover frame is provided with a cover or lattice plate (not shown).

70958

The underside of the collar 4 of the cover frame forms a support surface consisting of a planar surface 7 and an annular recess 8 inside it.

The cover frame is arranged to be supported by the street paving layer, in this case the asphalt layer 10. For this purpose, a recess is provided in the asphalt layer for the collar, substantially corresponding to the height of the collar, so that the upper surface of the collar is at the level of the street surface. The outer diameter of the skirt 6 is further chosen to be slightly smaller than the inner diameter of the concrete ring 3 of the well, so that the skirt extends inside the concrete ring - if necessary so loosely that the cover frame can be tilted obliquely to the concrete ring.

In a situation where the asphalt layer 10 is not fully hardened but also under the stress of overrunning vehicles, the asphalt is not squeezed out of the edge of the collar 4 but rises into the openings 9. This is best ensured by placing the openings 9 in the inner edge of the recess 8. The shape, size and number of the openings 9 can, of course, vary in phase, essentially to obtain the result either with fewer larger openings or with several smaller ones.

Claims (2)

70958 A cover frame for underground duct wells, the cover frame (2) comprising an annular collar (4) to be fitted to the surface of the cover layer (10) surrounding the passage opening (5) and a sheath-like skirt (6) integral with the collar to form an extension above the well foundation without immediately resting on the foundation, the collar-10 having a substantially annular planar surface (7) resting against the well coating layer (10) and an annular recess (8) radially inside it, characterized in that the annular recess (8) is formed openings (9) extending through the collar, 15 to substantially prevent the cover frame from sinking and tilting under the influence of the load of the overrunning vehicles when the cover layer (10) has not yet completely solidified. Cover frame according to Claim 1, characterized in that the openings (9) passing through the collar (4) are formed on the inner edge of the annular recess (8). Tue