HUT76770A - Flaw cover, mainly for raceways and manholes - Google Patents

Abstract

The cover, situated inside a surrounding frame, consists of a number of identical rectangular members (3), each in the shape of a sheet metal tray containing a filling material (6, 10). Each tray has a trapezoid cross-section, so that its upper surface is greater than its lower one; it is made from stainless steel and is welded to adjacent members. The filling material (6) is of concrete, with a top covering (10) the same as that of the adjacent road surface.

Description

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Cable manhole covers are traditionally made of cast iron. Lids, especially larger ones, are quite heavy, so opening and closing the shaft is a laborious task. In addition, the production cost of the known cast iron covers and the shaft frames used with them is very high. Because manhole covers are available in a variety of sizes, different sized lids need to be manufactured and stocked, which is an additional cost.

It is an object of the present invention to overcome the above drawbacks of known manhole covers.

The problem is solved by a cover structure comprising a plurality of uniform rectangular topsheets adjacent to each other in the preamble, the topsheet comprising a tin plate, side plates and a liner surrounded by a tin plate and a side plate. Preferably, the two side panels of each topsheet are form-fitting to one of the sections of the shaft frame. The use of uniform covers requires only one cover to be kept in stock and the cost of manufacturing the cover is reduced as the number of pieces to be manufactured increases.

The trough plate of the cover structure of the present invention is preferably trapezoidal and has a wider side of the trapezoid.

It is also advantageous if the outside of the turret is very accurate, because on the one hand the joint joints can be small and on the other hand the covers are interchangeable. The exact outer dimension can be achieved by mechanically reworking the upper edge of the turtle plate.

In an embodiment of the cover structure according to the invention, the trough plate and the side plates are preferably made of stainless steel and welded together. The advantage of using stainless material is that after machining it is not necessary to apply a corrosion protection coating, which would otherwise reduce the dimensional accuracy.

In a further embodiment of the cover structure according to the invention, the side plates are in the form of a parallelogram. This shape allows the side panels to fit snugly into one of the shapes of the shaft frame.

It may also be advantageous if at least one of the side edges of the side plates is machined. This also serves the purpose of dimensional accuracy.

In a further embodiment of the lid structure according to the invention, the side plates extend downwardly over the trough plate. This is advantageous in that it limits the contact surface between the topsheet and the shaft frame only to a narrow strip, namely the bottom edge of the side panels.

Since additional support surfaces would only render the cover structure overly defined, it is preferred that the shaft frame is provided with cover support surfaces only on the sides at the side panels.

As mentioned above, the turtle and the side panels are filled with liners. It is advantageous for the linings

«- At least the lower thicker lining of 4 t is concrete because it increases the bending strength of the topsheet by absorbing the compressive load.

The invention will now be described in more detail with reference to the drawings. The attached drawings show

Figure 1 is a longitudinal sectional view of a cover structure according to the invention; the

Figure 2 is a sectional view taken along the line A-A in Figure 1; the

Figure 3 is a side view of the cover structure; the

Figure 4 is a top view of the cover structure; in the end it is

Figure 5 is a detail drawing of a smaller scale.

The lid of the cover structure shown in Figure 1 comprises at least two identical rectangular topsheets 3 arranged side by side in the longitudinal direction. Each topsheet 3 comprises a trapezoidal sheet 4 of stainless steel or aluminum alloy bent to a trapezoidal shape, and side panels 5 in the form of a parallelogram welded or screwed to the side of the sheet. As it is

Figure 1 shows the color of the side panels 5 on the right side with the turtle 4, while on the left and down the projections 4 over the plate 4. The upper edge 7 of the turntable 4 is ground or milled in a plane perpendicular to the upper plane to ensure an accurate outer dimension 8 (see Figure 5). The lower end edges of the side plates 5 are also machined to be exactly flat. In addition, even the left-hand edge of the side-plates can be machined. There are 9 flat irons in each of the four corners of the turtle plate 4 and the side plate plate 5 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Two of the flat irons 9 are even welded to each of the hoops 13, into which a lifting device can be inserted and by means of which they can be lifted out of the shaft frame by sliding the covers 3.

The turtle formed by the turtle plate 4 and the side plates 5 is filled with a liner 6, which is usually concrete, almost to the upper edge. The liner 6 absorbs the compressive forces and thus increases the bending strength of the topsheet 3. The liner 10 is the casing layer of the turtle and may be selected according to the type of pavement at the site where the shaft is installed.

When the manhole is covered, the topsheet 3 shown on the left side of Figure 1 is first inserted and slid into the inwardly sloping fitting 11 of the manhole frame, whereby the topsheet 3 is in a closed position. The second topsheet 3 is then inserted.

Accurate dimensional tolerance of the stainless steel structure allows for nearly gap-free installation, which prevents dirt or larger amounts of water from penetrating the shaft. Since the side panels 5 are perfectly flat on the shaft frame 1, vehicles passing through the cover can hardly cause vibration; less so because the abutment surface is only two narrow foreheads of the side plates 5. The exposed, visible steel surface on the top of the lid is extremely small, reducing the risk of slipping on it. By placing two, three or more topsheets 3 side by side, shafts of different lengths can be covered.

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By attaching the reinforcing bars 11, 12 forming the shaft frame 1 with concrete reinforcement, according to the embodiment shown in Figures 1 and 2, it is possible to concretize it into a concrete wreath 2. Thus, the shaft frames 1 can be pre-assembled with a narrow tolerance.

Since the trough plate 4 and the side plates 5 are made of stainless steel, it is not necessary to apply a corrosion protection coating after machining, which would impair the dimensional accuracy. By means of the parallelogram plates, the adjacent topsheets 3 engage in a form-fitting manner with one another and with the profile 11 of the shaft frame.

By placing different number of identical slabs side-by-side to cover wells of different lengths, on the one hand, storage costs are reduced and, on the other hand, larger slabs can be manufactured cheaper. The narrow, upright forehead edges of the side-plates 5 inhibit dirt, ice, etc. and since the tops of the topsheets 3 are flat against the shaft frame 1, they are time and abrasion resistant so that no vibration can occur.

By machining with machining, very narrow and narrow tolerances in mounting gaps can be maintained. Because the dimensions are very accurate, each cover is interchangeable.

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Claims

Claims (2)

A cover structure for covering a shaft, in particular a cable shaft, having a cover which can be inserted into a shaft frame (1), characterized in that the cover comprises a plurality of uniform rectangular cover plates (3) adjacent to each other; side panels (5) and linings (6) surrounded by a turtle formed by the turtle (4) and the side panels (5), 10); and the two side panels (5) of each topsheet (3) are preferably shaped to form one of the shapes (11) of the shaft frame (1). The roof structure according to claim 1, characterized in that the section of the trough plate (4) is trapezoidal and its upper side is wider than its lower side. Cover structure according to Claim 1 or 2, characterized in that the outer dimension (8) of the trough plate (4) is very accurate by mechanical machining of the upper edge (7) of the trough plate (4). 4. A roof structure according to any one of claims 1 to 3, characterized in that the trough plate (4) and the side plates (5) are made of stainless steel and are welded together. ·· · * «· · 5. Cover structure according to one of claims 1 to 3, characterized in that the side plates (5) have a parallelogram in side view. 6. Cover structure according to one of claims 1 to 3, characterized in that the side plates (5) are machined by cutting at least one of the lateral face edges. 7. Cover structure according to any one of claims 1 to 4, characterized in that the side plates (5) extend downwardly over the trough plate (4). 8. Cover structure according to any one of claims 1 to 4, characterized in that the shaft frame (1) is provided with surfaces supporting the cover plates (3) only on the sides at the side plates (5). 9. A roof structure according to any one of claims 1 to 6, characterized in that the liner (6) constituting at least the lower layer of the linings (6, 10) is concrete. The agent shall: Qss has Tibome 809 / CSA List of References Mine Frame Concrete Wreath Cover Plate Tinplate Side Plate Lining Top Edge External Dimension Flat Iron Lining Shape Hoop DISCLOSURE COPIES CE »* ·· ►« ·· 2/1 76770 ω < tendon Tiborné Csanak Attorney-at-Law S.BG & 4C Ifenze / TzakbadamÍTrocnhagia H 1062 Budapest, Andrássy út 113 Phone 34-24-950, Fax 34-24-323 ···· · * * ♦ · · · * · ······ ♦ «· · 2/2 PUBLICATIONS - '*