SCHACHT

Description

[0001] The invention relates to a shaft whose shaft walls consist of superimposed wall elements produced by injection molding. Usually, two or three rows of wall elements are arranged one above the other, with the upper end of the shaft walls thus formed comprising a steel frame made of a circumferential rectangular profile, on which one or more shaft covers are arranged, which are surrounded by a flat steel bar attached to the outside of the steel frame. A shaft of this type is described, for example, in DE 103 14 897 B3 or EP 1 587 199 A1. The upper edge of the flat steel bar and the upper side of the shaft cover(s) must be at the same height as the area surrounding the shaft. For this purpose, it is known that the steel frame can be supported on spindles whose length is adjusted so that the shaft cover(s) are at ambient level.

[0002] Since the manhole cover(s) may be exposed to high mechanical loads from motor vehicle traffic depending on the installation location, the upper end of the manhole must be sufficiently stable.

[0003] The object of the present invention is to provide a shaft in which the upper closure can be installed quickly and easily.

[0004] This object is achieved according to the invention by the features of patent claim 1.

[0005] Advantageous embodiments of the invention are characterized in the subclaims.

[0006] The invention provides that a head frame rests on the upper side of the shaft walls, which is fixed to the shaft walls by clamping means and / or locking means, and that the steel frame rests either directly on the head frame or on an underlaying mortar layer arranged on the head frame. With this design, the head frame can be easily installed without the aid of tools, while still ensuring that the head frame is held immovably on the shaft walls under all loads. The steel frame rests either on the head frame or on an underlaying mortar layer arranged on the head frame when the steel frame is raised with the aid of extended spindles.

[0007] The head frame is preferably made of plastic, preferably PC, using the injection molding process.

[0008] Furthermore, the head frame is designed to be composed of several head frame sections. Since the shaft has a rectangular shape, the head frame consists of four head frame sections that abut each other at the corners of the shaft or interlock after the head frame sections are attached to the shaft walls.

[0009] For this purpose, it is particularly advantageously proposed that the head frame parts have hooks on a lateral edge section, preferably on the outer edge section, as clamping means, which are inserted into the shaft walls to position the head frame on the shaft walls. The hooks can be formed integrally with the head frame parts or can be non-positively attached to the head frame parts in any suitable manner. The head frame parts positioned in this way are assembled at the corners to form a closed head frame.

[0010] According to another proposal, the head frame parts have locking lugs on the opposite side edges that snap into recesses in the shaft walls to fix the head frame to the shaft walls.

[0011] The tool-free fastening of the head frame to the top of the shaft walls can be carried out quickly and easily, even by an inexperienced fitter.

[0012] According to a further proposal of the invention, the head frame consists of a plate-shaped section that rests on the shaft walls and a formwork section that is angled upwards in the installed position and is arranged on the inside of the shaft walls. The formwork section expediently adjoins the plate-shaped section at a right angle. This design ensures that only a small amount of grouting mortar is required to underline the steel frame, which stands on extended spindles, because the thin-bodied mortar applied to the head frame cannot flow to the inside of the shaft. This advantageous effect can be further increased by attaching a formwork wall to the outside of the shaft wall, according to a further proposal. This formwork wall can be attached to the shaft wall with clips, so that the outer formwork can be removed again after grouting has been completed.

[0013] At the upper edge of the formwork section of the head frame, cutouts are conveniently provided for the insertion of locking bolts of the cover(s) to secure the cover's installation position. These cutouts can be covered by sliding closure plates, which prevent unwanted leakage of grout from the cutouts.

[0014] It is also proposed that the head frame preferably has a recess at each corner area for receiving a support plate, and that the spindles are arranged at corresponding points in the steel frame, which spindles can be extended to the surrounding level in order to compensate for the height of the steel frame and are supported on the support plates.

[0015] Further details of the invention will become apparent from the following description of a preferred embodiment and from the drawings. 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 closure plates; Figures 5A to 5D: hooks for positioning the head frame in a perspective view and during fastening of the head frame; Figures 6A and 6B: vertical section through the head frame with a locking lug before and after fastening of the head frame; Figure 7: a sectional view of the upper end of a shaft; Figures 8A and 8B: the assembly of the end caps and an enlarged view of one of them; Figure 9: the attachment of an external formwork to the upper edge of the shaft wall.

[0016] Figure 1shows 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.

[0017] Figure 2shows the complete 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 parts 6, which are joined at the corners of the rectangular shaft. The head frame parts 6 consist of a substantially plate-shaped section 7, which rests on the associated shaft wall, and a formwork section 8, which is angled upwards at a right angle and faces the inside of the shaft. In the upper edge area of the formwork sections 8, recesses 9 are formed, into which locking bolts (not shown) of the shaft cover can enter. The recesses 9 can be releasably closed by plugged-on closure plates 10, which in Figure 4 are shown.

[0018] 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, whereby this locking of the head frame part 6 or the entire head frame 2 is immovably fixed to the shaft wall.

[0019] Figure 5 A shows a perspective view of a hook 11. The Figures 5 C and 5 D show the insertion of the head frame part 6 provided with the hook 11 under the upper wall of the wall element 1 for positioning the head frame part 6 on the shaft wall. Figure 5B shows the position of two hooks 11 on the shaft wall 1.

[0020] Figure 6 shows a locking lug 12 on the underside of the head frame part 6 at its inner edge area. When the locking lug 12 is engaged in a corresponding recess in the top side of the wall element 1, the head frame part 6 or the entire assembled head frame 2 is immovably fixed to the top side of the wall element 1.

[0021] Figure 7 is a vertical section through the upper end section of the shaft. An end cap 13 is inserted into the steel frame 3 at each corner. This end cap contains a downwardly extending spindle 14, which rests on a support plate 15 when the spindle 14 is extended downwards to achieve height compensation ( Figures 8A and 8B). In order to ensure the required stability of the steel frame 3, which stands on four spindles, the steel frame must be lined with a flowable mortar that fills the entire free space beneath the steel frame 3. The inner formwork section 8 prevents the liquid mortar from running into the interior of the shaft. To prevent this from happening on the outside of the shaft as well, a circumferential outer shell 16 is attached to the outside of the wall element 1 with clips 17, as shown in Figure 9 shows.

Claims

1. A rectangular shaft, which is composed of a plurality of shaft walls (1) consisting of plastic material, wherein resting on the upper side of the shaft walls there is a head frame and the upper end of the shaft has a steel frame, on which one or more shaft covers can be arranged, characterised in that the head frame (2) is composed of a plurality of head frame portions (6), that the steel frame rests either directly on the head frame or on a supporting mortar layer arranged on the head frame and that the head frame is fixed in position on the shaft walls by clamping means and / or locking means.

2. A shaft as claimed in Claim 1, characterised in that the head frame portions (6) have hooks (11) on a lateral edge section, which are pushed into the shaft walls (1) in order to position the head frame portions (6) on the shaft walls (1).

3. A shaft as claimed in one of Claims 1 or 2, characterised in that the head frame portions (6) have locking lugs (12) on the opposing lateral edge, which lock into openings in the shaft walls (1) in order to fix the head frame (2) in position.

4. A shaft as claimed in one of Claims 1 to 3, characterised in that the head frame (2) includes a plate-shaped section (7), which rests on the shaft walls (1), and a casing section (8) angled upwardly in the installed position, which is arranged on the inner side of the shaft walls (1) in the installed position.

5. A shaft as claimed in one of Claims 1 to 4, characterised in that the head frame (2) includes a mounting (18) for a support plate (15), preferably at each corner region, and that arranged in the steel frame (4) at appropriate positions there are spindles (14), which are extendible for adjusting the height of the steel frame (4) and are supported on the support plates.

6. A shaft as claimed in one of Claims 4 or 5, characterised in that formed at the upper edge of the casing section (8) of the head frame (2) there are notches (9), which are covered by detachably pushed on closure plates (10).

7. A shaft as claimed in one of Claims 1 to 6, characterised in that a peripheral outer casing (6) may be attached to the shaft wall (1) with clips (17).