SCHACHT

Description

[0001] The invention relates to a shaft whose shaft walls consist of wall elements placed on top of one another, which are produced from plastic by injection molding, according to the preamble of claim 1.

[0002] Typically, two or three rows of wall elements are arranged one above the other, with different heights being available for the top wall element to ensure that the top of the shaft reaches as close as possible to the surrounding level. The upper end of the shaft walls formed in this way contains a steel frame, usually a circumferential rectangular profile, on which one or more shaft covers are arranged. These covers are enclosed by a flat steel bar attached to the outside of the steel frame.

[0003] The top edge of the flat steel and the top of the manhole cover(s) must be at the same height as the surrounding area when the shaft is completed, as such a shaft is usually accessible and traversable. To adjust the height of the upper end of the shaft, it is known that the steel frame can be supported on spindles, the length of which is adjusted so that the manhole cover(s) are exactly level with the surrounding area.

[0004] Since the manhole cover(s) can be subjected to great mechanical stress, the upper end of the manhole must be sufficiently stable.

[0005] DE 103 14 897 B3 and EP 1 587 199 A1 disclose systems for accommodating distribution devices for copper and / or fiber optic cables. These systems consist of several plastic shaft walls installed in the ground, the upper end of which has a steel frame on which one or more shaft covers are arranged. DE 20 2007 014 465 U also discloses an underground shaft in which the frame elements are assembled before the underground shaft is installed in the ground.

[0006] The present invention is based on the object of providing a shaft of the type mentioned above, in which, in the event of a height adjustment with the spindles extended, it is possible to verify whether the associated measures have been correctly implemented. In particular, it should be possible to verify whether all spindles are correctly extended and whether the thin mortar applied is sufficient to support the raised steel frame.

[0007] This object is achieved according to the invention by the features of patent claim 1.

[0008] Advantageous embodiments of the invention are characterized in the subclaims.

[0009] The invention provides that a head frame is fastened to the top side of the shaft walls, said head frame having a plate-shaped section resting on the shaft walls and a formwork section angled upwards in the installed position and arranged on the inside of the shaft walls in the installed position. The steel frame has a spindle at each corner area which can be extended to compensate for the height of the steel frame, so that the steel frame rests either directly on the head frame or on extended spindles and an underlaying mortar layer arranged on the head frame. Furthermore, the invention provides that in the area of ​​the spindles a recess is formed in the formwork section of the head frame, in which a viewing window is arranged which can be removed to enable the area of ​​the spindle to be visually inspected.

[0010] Through this recess, with the viewing window removed, it is possible to see from the inside of the shaft whether all spindles are correctly extended and whether the thin mortar applied reaches a sufficient height to underpin the steel frame and thus provide stable support.

[0011] It is preferred that the plate-shaped, removable viewing window has means on the edge, e.g. in the form of hooks, with which the viewing window can be attached to the edge of the window opening.

[0012] The viewing window can also be made of a transparent material so that it does not have to be removed for inspection.

[0013] The formwork section, which preferably adjoins the plate-shaped section at an angle of 90°, reliably prevents the thin mortar from partially running into the interior of the shaft.

[0014] According to a further proposal of the invention, a circumferential outer formwork can also be attached to the opposite side of the shaft wall with clips, which also prevents the mortar from running off there. This can reduce the installation costs of the shaft.

[0015] The head frame can be composed of several head frame sections that abut one another or interlock at the corners of the generally rectangular shaft. The individual head frame sections can have hooks on one side edge that are inserted into the corresponding shaft walls to initially position the head frame sections correctly on the shaft walls. On the opposite edge, the head frame sections can have locking lugs that engage in recesses in the shaft walls, thus immovably fixing the entire head frame to the top of the shaft walls.

[0016] The head frame can advantageously have a mount for a support plate in the area of ​​each viewing window, on which an extended spindle rests. The support plates can withstand the high contact pressure that can be caused by traffic loads on the manhole cover.

[0017] The head frame is preferably manufactured in one piece using a plastic injection molding process, preferably from PC. However, it is also within the scope of the invention for the plate-shaped section and the formwork section of the head frame to be assembled in a suitable manner as separately manufactured components.

[0018] Further details of the invention will become apparent from the following description of a preferred embodiment and from the drawings. These show: Figure 1: a perspective view of a complete shaft; Figure 2: two representations of the assembly of a head frame; Figure 3: a head frame part with hooks for positioning and locking lugs for fixing; Figure 4: the assembly of a viewing window; Figures 5A to 5D: a rear view, a side view, an end view and a perspective view of a viewing window; Figure 6: a sectional view of the upper end of a shaft with a viewing window; Figure 7: a schematic representation of the compensation at ambient level; Figure 8: the assembly of an external formwork at the upper edge of the shaft wall.

[0019] Figure 1 shows a perspective view of a shaft whose shaft walls consist of three stacked wall elements 1. The upper end of the shaft is formed by a head frame 2 and a steel frame 3 arranged above it, to which a circumferential flat steel 4 is attached, in which two shaft covers 5 are arranged flush.

[0020] Figure 2 Figure 1 shows a head frame 2, which is attached to the top of two wall elements 1 of different heights. The head frame 2 consists of four head frame sections 6, which are joined at the corners of the rectangular shaft. The head frame sections 6 consist of a substantially plate-shaped section 7, which is attached to the associated shaft wall, and a formwork section 8 angled upwards at a right angle, which faces the inside of the shaft. Recesses 9 are formed in the upper edge region of the formwork section 8, into which locking bolts of the shaft covers can engage. The recesses 9 can be releasably closed by means of attached closure plates (not shown).

[0021] In Figure 3A head frame part 6 is shown that can be attached to the top of a shaft wall without the aid of tools. For this purpose, the head frame part 6 is provided with hooks 11 and locking lugs 12. The hooks 11 form clamping means that are inserted into the shaft wall from the outside of the shaft in order to initially position the head frame part 6 correctly on the top of the shaft wall. The locking lugs 12 engage in recesses in the shaft wall on the inside of the shaft, whereby this locking mechanism fixes the head frame part 6 or the entire head frame 2 immovably to the shaft wall.

[0022] In the right end area of ​​the head frame part 6 or in the corner area of ​​the head frame 2, a recess 10 is formed in the formwork wall 8, into which a removable viewing window 13 can be inserted by sliding and locking. The viewing window is shown in several views in the Figures 5A to 5CAs shown. At a point aligned with the recess 10 for the viewing window 13, a recess 14 is formed in the plate-shaped section 7 of the head frame 2, into which a support plate 18 is inserted, on which a spindle described below rests for height compensation of the steel frame 3.

[0023] In Figure 4 The left-hand illustration shows the recess 10 in the formwork wall 8 without the viewing window 13. At the edge of the recess 10, means for receiving hooks 14a, which are formed at the edge of the viewing window 13, are indicated. The viewing window 13 is installed by sliding it in and locking it in place using the hooks 14a. The right-hand illustration shows... Figure 4 The viewing window 13 is shown in its installed state.

[0024] In Figure 5Details of the viewing window are shown, which contains a smooth closed surface 15, the edge of which is reinforced by a surrounding frame 16, on which hooks 14a projecting laterally beyond the surface 15 are formed.

[0025] Figure 6 shows a vertical section through the upper end of a shaft with the upper wall element 1. The head frame is attached to the upper side of the wall element 1 by the hooks 11 of the plate-shaped section 7 of the head frame 2 being clamped into the wall element 1. In the steel frame 3 there is an end cap with a spindle 17, which in the illustration of the Figure 6is extended downwards for height compensation and rests on a support plate 18 arranged in the recess 14. As a result, the steel frame 3 is raised to such an extent that the upper side of the manhole cover 5 arranged on the steel frame 3 and the upper edge of the steel plate 4 surrounding the cover 5 are level with the surrounding level.

[0026] The resulting gap between the lower edge of the steel frame 3 and the plate-shaped section 7 of the head frame 2 must be filled with mortar.

[0027] Figure 6 also shows a viewing window 13 in the head frame part 6, which is offset by 90° and is removed in order to be able to check the area of ​​the spindle offset by 90°. The schematic diagram of the Figure 7shows the view of a spindle 17 released by removing a viewing window. The compensation to the surrounding level is indicated by two arrows H, whereby this space is filled with mortar.

[0028] In Figure 8 A circumferential outer formwork 19 is shown, which complements the inner formwork wall 8 so that no mortar can escape on either side. The outer formwork 19 is assembled by plugging together the individual sheet metal parts and by securing the entire outer formwork with so-called Christmas tree clips at the upper end of the wall element 1.

Claims

1. A shaft, which is composed of a plurality of shaft walls (1) consisting of plastic material, the upper end of which has a steel frame (3), arranged on which are one or more shaft covers (5), characterised in that fastened on the upper side of the shaft walls (1) there is a head frame (2), that the head frame (2) includes a region (7), which rests on the shaft walls (1), and a casing section (8), which is bent upwardly, in the installed position, which is arranged, in the installed position, on the inner side of the shaft walls (1), that the steel frame (3) includes a respective spindle (17) at each corner region, which is extendable for height adjustment of the steel frame (3) so that the steel frame (3) rests either directly on the head frame (2) or on extended spindles (17) and on a supporting layer of mortar arranged on the head frame (2), and that formed at each corner region there is a respective opening (10) in the casing section (8) of the head frame (2), arranged in which there is a viewing window (13), which is preferably removable, in order to be able visually to monitor the correct performance of the installation of the steel frame (3).

2. A shaft as claimed in Claim 1, characterised in that the viewing windows (13) include means (14a) for sliding into and locking in the associated openings (10).

3. A shaft as claimed in one of Claims 1 or 2, characterised in that in the region of the viewing windows (13) the head frame (2) has a respective mounting (14) for a support plate (18), on which an extended spindle (17) bears.

4. A shaft as claimed in one of Claims 1 to 3, characterised in that the head frame (2) is composed of a plurality of head frame portions (6).

5. A shaft as claimed in one of Claims 1 to 4, characterised in that a peripheral outer casing (19) is mountable externally on the shaft wall (1) with clips.

6. A shaft as claimed in one of Claims 1 to 5, characterised in that the plate-shaped section (7) and the casing section (8) of the head frame (2) are manufactured integrally in a plastic injection moulding process.