EP0941389A1

EP0941389A1 - Shaft bottom

Info

Publication number: EP0941389A1
Application number: EP97945659A
Authority: EP
Inventors: Andreas Posch
Original assignee: Ing Julius Posch GmbH
Current assignee: Ing Julius Posch GmbH
Priority date: 1996-11-29
Filing date: 1997-11-28
Publication date: 1999-09-15
Also published as: HRP970643A2; HRP970643B1; AU5109898A; WO1998023820A1; DE19781344D2

Abstract

A shaft bottom (20) with a sole plate (2) and a casing (3) has a channel connecting an inlet opening (5) with an outlet opening (6). The channel (9) is formed of a cavity (21) which broadens conically towards the top and is arranged concentrically to the axis (11) of the shaft bottom (20), and of two slit-like recesses (22) which lead radially outwards from the cavity (21) to the inlet opening (5) and outlet opening (6). For the production of such shaft bottoms (20), a mould is proposed which has a substantially cylindrical casing (132) and a mould core (131). The mould core (131) has a truncated cone shaped section (134) which tapers to the top in the position of use, the top end (133) of which is hemispherical. In order to form the channel (9) in the shaft bottom (20), two channel moulded pieces (135) are arranged on the mould core (131). The channel moulded pieces (135) have sleeve-shaped inserts (119).

Description

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The invention relates to a manhole base made of concrete or similar material, with a jacket, at least two openings provided in the jacket and with a channel connecting the openings, formed by recesses in the base plate, the upwardly facing surface of the base plate one to the axis of the manhole base Has concentric, substantially conical recess.

Manhole bases are components of manholes that are structures for an underground drainage channel or an underground sewage pipe. Shafts serve in particular for ventilation, control, maintenance and cleaning and, if necessary, the inclusion of systems for lifting sewage, for merging, as well as for changing the direction, inclination and cross-section of channels. The manholes are assembled from ring-shaped prefabricated parts (of concrete or the like) with sleeves, the bottom part of a manhole being a manhole bottom with a floor. The manhole bases consist of a bottom plate (floor), a flume, and an inlet opening and an outlet opening at the ends of the same. The channel has a slope from the inlet to the outlet to prevent water standing in the channel in the lower part of the shaft, even when there is little water. There are manhole bases with a straight channel and manhole bases in which the inlet and outlet are not diametrically opposed to one another, so that an angled or curved channel results. Flumes that connect the inlet opening with the outlet opening in the lower parts of the shaft are usually subsequently made in a lower part of the shaft that is finished up to the flume, i.e. a component with a flat bottom plate. Not only is this a significant amount of work, it also results in a disadvantageous, non-monolithic

Execution of the manhole base.

A lower part of the shaft of the type mentioned at the outset is known from FR-2 623 536 A. In the lower part of the shaft according to FR-2 623 536 A, the surface of the floor facing upwards is of the lower part of the manhole recessed conically. The channel forming recesses are provided in the bottom, which lead to the openings in the wall of the manhole base. In the construction according to FR-2 623 536 A, the conical recess is not part of the channel, since this is formed exclusively by the recesses leading to the openings. This results in disadvantageous edges in the region of the channel - this also applies to the lower shaft part, which can be produced with a shape according to US Pat. No. 5,413,307 A.

The invention has for its object to provide a manhole base available, which can be manufactured in one operation and which has a favorable formation of the channel between the inlet opening and outlet opening, even if they are not diametrically opposed to each other with respect to the axis of the manhole base.

According to the invention, this object is achieved in a manhole base of the type mentioned at the outset in that the conical recess in the manhole bottom part, together with the recesses emanating from it and leading to the openings in the casing of the manhole bottom part, forms the channel of the manhole bottom part and that the lower end of the conical recess lies at the same height as the deepest point of the recesses leading to the openings in the casing of the manhole base.

In the configuration of the manhole base according to the invention, the conical recess forms, since it extends to the deepest point of the recesses, which leads to the inlet opening and to the

Lead drain opening, together with these the channel is sufficient so that, unlike in the prior art, there are no disadvantageous edges which hinder the flow of liquids through the lower part of the manhole. Nevertheless, the manhole base according to the invention can be made in one piece from concrete or the like. are produced and the subsequent concreting of the channel customary in the prior art is eliminated.

In one embodiment, the lower part of the manhole according to the invention is characterized in that the recess at its deep most section is flattened. Alternatively and preferably, it can be provided in the lower part of the manhole according to the invention that the recess is curved at its deepest section. In addition to this preferred embodiment, an embodiment is also conceivable in which it is provided that the recess is tapered at its deepest section.

If the recess is curved at its deepest section, it is preferred within the scope of the invention that the radius of curvature of the deepest section of the recess is the same size as the radius of the inner end of the opening. This avoids disadvantageous changes in cross-sectional shape and size in the channel.

It is usually provided in the lower part of the shaft according to the invention that the recesses leading to the openings run radially with respect to the central axis of the lower part of the shaft.

The manhole base according to the invention is particularly easy to manufacture if it is provided that the recesses leading to the openings are channel-like or groove-like, upwardly open depressions. The same advantage is offered by an embodiment of the lower part of the shaft according to the invention, in which it is provided that the recesses leading from the cutout to the openings are delimited in their upper region by two parallel, flat surfaces.

There are various possibilities for the design of the recesses leading to the openings in the casing of the manhole base. It can be provided that the recesses leading from the recess to the openings are flattened in their lower section. Alternatively, it can be provided that the recesses leading from the cutout to the openings have a pointed section in their lower section.

However, it is preferably provided within the scope of the invention that the recesses leading from the cutout to the openings in have a circular cross-sectional shape in their lower portion. This embodiment offers in particular if it is additionally provided that the radius of the circular cross-sectional shape of the recesses leading from the cutout to the openings has a radius which is the same size as the radius of the inner end of the openings the advantage that of that through the recesses formed channels to the openings in the jacket there is a smooth transition without disturbing edges.

In one embodiment of the lower part of the shaft according to the invention it can be provided that the inner surface of the recess merges via a shoulder into a surface leading to the free upper edge of the lower part of the shaft. It is preferred that the shoulder sloping towards the axis of the lower shaft part. Furthermore, it can be provided that the surface that leads to the free, upper edge of the lower shaft part is a truncated cone surface that widens conically upwards. These embodiments have the advantage that water penetrating into the shaft does not remain on the upward-facing surfaces of the lower part of the shaft, but rather flows down into its channel.

The invention further relates to a mold for the manufacture of manhole bases made of concrete or similar material in the top-bottom position with a molded jacket and a molded core, a channel shaped body arranged on the molded core for the formation of a channel and with socket shaped inserts for the molding of at least one inlet opening and at least one drain opening in the wall of the manhole base, which are arranged on the channel body on its surfaces facing away from the mandrel, the mandrel for forming the bottom of the manhole base to be produced having a hemispherical or spherical-spherical region, and wherein the channel shape - Body has two side wall parts that lead to the mandrel, and which are connected in the use position by a wall part above.

Molds are used for the manufacture of manhole bases, which contain a molded jacket and a Men, cylindrical mold core, with socket inserts to form the inlet and the outlet are arranged between the mold core and the mold jacket. Furthermore, a support ring is provided in order to produce a stepped formation on the free edge, which is the upper edge in the position of use of the lower shaft part, via which the lower shaft part can be connected to the shaft ring lying thereon.

In the case of these molds, the cavity between the mold jacket and the mold core is poured out with wet or earth-moist concrete and, if necessary, shaken. After the concrete has hardened, the form is removed and the flume is concreted in by hand after the raw manhole base has been turned over.

It has also been proposed to fasten a channel shaped body on a shortened cylindrical mandrel on the flat cover surface thereof and to provide a second channel shaped body rotatably. By rotating the second channel shaped body, manhole bases can also be produced that do not have diametrically opposed inlets and outlets. A disadvantage of this known embodiment (manufacturer H. Niemeyer Söhne GmbH & Co. KG in Hörstel (FRG)) is that manhole bases made with this known shape in the area of the cylindrical support for the movable channel shaped body have to be subsequently filled with concrete, for which purpose a channel must be formed and concreted.

A form of the type mentioned above for the manufacture of manhole bases is known from US Pat. No. 5,413,307. In US Pat. No. 5,413,307 A, the mandrel has an upper end which is curved approximately in the shape of a spherical cap, but is otherwise formed in the shape of a cylinder jacket. Furthermore, in the form according to US Pat. No. 5,413,307 A, a single continuous shaped body is provided for the channel, which is arranged exclusively in the region of the curved end of the mandrel. Since the channel body in US-5 413 307 A is welded to the mandrel, there is no possibility in US-5 413 307 A to use one and the same mandrel for straight as well as for angled or curved channels. For this are special mold cores required.

The invention is also based on the object of providing a mold which, when used, does not require subsequent concreting of the channel in the manhole bases and the replacement of the channel body required in the prior art can be avoided as far as possible.

This object is achieved according to the invention in the case of a shape of the type mentioned above in that the mandrel has a frustoconical-shaped area which, in the position of use of the shape, adjoins the hemispherical or spherical cap-shaped area at the bottom and widens towards the bottom the channel shaped body for forming the channel consists of at least two channel shaped bodies which rest with their side wall parts both on the hemispherical or spherical cap-shaped area and on the truncated cone-shaped area of the mandrel, and that the top generators of the channel shaped body in the area of use in the shape of the shape are arranged in the position of use at the upper end of the hemispherical or spherical cap-shaped region of the mandrel.

The invention provides a form for producing manhole bases in which the channel does not have to be concreted afterwards.

In one embodiment of the invention it is provided that an essentially cylindrical section of the mandrel connects to the larger diameter end of the mandrel, an annular connecting part arranged between the mandrel and the essentially cylindrical section being inclined to the axis of the mandrel.

With this embodiment, a manhole bottom part can be produced, the upper end of which, in the position of use, is shaped particularly favorably for connecting further manhole parts, for example manhole rings.

According to a proposal of the invention it can be provided that the socket mold inserts are movable, in particular pivotable, with respect to the shaped channel bodies. With this embodiment of the mold according to the invention, the socket mold inserts can be aligned in a favorable or required position.

The exchange of the socket mold inserts is particularly simple if, according to a proposal of the invention, the socket mold inserts are detachably fastened to the channel shaped bodies. It is preferred if the socket mold inserts are fastened to the channel shaped bodies by a plug connection.

If, according to a proposal of the invention, it is provided that the side wall parts of the channel body run parallel to one another and that the wall part connecting the side wall parts is curved, this results in a particularly streamlined shape of the channel.

In one embodiment of the invention it is provided that the

Channel shaped body in top view, i.e. seen in the position of use of the form from above, are curved. With this embodiment, manhole bases can be produced whose channels are not straight but curved.

If the channel is to be formed straight in the lower part of the manhole made according to the invention, an embodiment is preferred in which it is provided that the channel body in plan view, i.e. seen in the position of use of the form from above, are straight.

A preferred embodiment of the shape according to the invention is characterized in that the position of the channel body can be changed relative to one another. With this embodiment, manhole bases can be produced in which the inlet opening of the outlet opening is arranged either diametrically or non-diametrically opposite one another. In this embodiment, it is preferred that one channel body is fixed and the other channel body is movably arranged. In a further development of this embodiment, according to a Impact of the invention may be provided that the movable channel shaped body abuts and is guided on the annular intermediate part connecting the conical section of the mandrel with the substantially cylindrical section thereof. The setting of the movable channel shaped body in the desired position is particularly easy if it is provided according to the invention that a curved slot is provided in the intermediate part, which is penetrated by retaining screws for the movable channel shaped body. In order to prevent undesired leakage of material from which the manhole base with the shape according to the invention is produced through the curved slot, it can be provided according to a proposal of the invention that abrasive plates with a partial circular ring shape are arranged on the side of the channel shaped body, which are arranged on the ring surface Cover areas of the slot not covered by the channel body.

In one embodiment of the mold according to the invention it is provided that the end walls of the channel body facing away from the mold core are aligned parallel to the axis of the mold core. This opens up the possibility in a simple manner of producing manhole bases, the side walls of which are aligned parallel to the axis of the manhole base in the region of the channel form bodies.

The adaptation of the shape according to the invention to different manhole bases is particularly simple if it is provided that the mandrel is divided at least once. It is preferred if the upper hemispherical or dome-shaped section on the lower frustoconical section of the mandrel is arranged interchangeably and / or rotatably. In this embodiment of the form according to the invention, it is preferred that at least one channel shaped body is attached to the upper part of the shaped core and is adjustable, in particular pivotable, with the latter relative to the other channel shaped body. In this way, the position of the channel shaped bodies relative to one another can be set particularly easily.

In order to secure the position of the channel shaped bodies relative to one another in the position once selected, the Invention may be provided that a clamping device is provided for fixing the upper portion of the mandrel at the lower portion thereof. It is preferred that the clamping device, a clamping screw, a clamping cylinder, an electromagnetic tension anchor or the like. is. There is also the possibility within the scope of the invention that motor drives are provided for the relative rotation of the sections of the mandrel. It is preferred that the motor drive is a rack and pinion drive, a pressure medium motor, or the like. is.

With the mold according to the invention, it is advantageous if the mold core is divided twice. This extends the options for adapting the shape to the design of the manhole base.

If the mandrel of the mold according to the invention is subdivided at least once, it is preferred within the scope of the invention that the lower part of the conical section of the mandrel is connected to the substantially cylindrical section, that one channel channel body at the central section and the other at the upper section the channel body is arranged.

In the form according to the invention, the channel shaped bodies can be fastened to the mandrel by plug connections or by welded connections. The former variant is preferred if the channel bodies are to be exchangeable.

If manhole bases which have more than one inlet opening or outlet opening are to be produced with the mold according to the invention, it is provided according to a proposal of the invention that more than two, preferably three channel shaped bodies are arranged on the mold core.

If, according to a further proposal of the invention, it is provided that the upper end faces of the channel body facing the bottom of the manhole base to be produced are inclined to the axis of the mandrel in accordance with the slope of the channel in the manhole base to be produced, the required slope of the channel is reached without reworking.

In order to be able to adapt the position of the socket-shaped inserts to the circumstances, it is provided according to a proposal of the invention that the surfaces of the channel-shaped elements facing the socket-shaped inserts are spherical or spherical cap-shaped and that the connecting pieces of the socket-shaped inserts are designed to be opposite, so that the sleeve inserts are movable in the manner of a ball joint in relation to the shaped channel bodies.

Further details and advantages of the invention will become apparent from the following description with reference to exemplary embodiments of manhole bases shown in the drawings and molds for producing manhole bases according to the invention.

It shows:

1 shows a known lower part of the shaft in axial section;

Figure 2 shows the lower shaft section in section along line II-II in Fig. 1.

3 shows an axial section of a known manhole lower part with a diametrically opposite inlet opening and outlet opening;

Fig. 4 shows the lower shaft part of Fig. 3 in section along the line

IV-IV in Fig. 3;

FIG. 5 the lower part of the manhole of FIG. 3 with the channel concreted in;

6 shows a first embodiment of a shaft lower part according to the invention in axial section, the left half of FIG. 6 a section perpendicular to the axis of the inlet or outlet opening and the right half of FIG. 6 a section parallel to the axis of the closed - or drain opening shows; 7 shows a section along the line VII-VII from FIG. 6 with inlet and outlet openings with different nominal widths;

8 and 9 a second embodiment of a manhole base according to the invention in views corresponding to those of FIGS. 6 and 7;

10 and 11 a third embodiment of a manhole base according to the invention in views corresponding to those of FIGS. 6 and 7;

12 shows a known mold for producing manhole bases;

13 shows a known form for producing manhole bases, with a socket insert;

14 to 16 in different views a known mold core for molds for producing manhole bases (company Niemeyer);

17 schematically shows a first embodiment of a mold according to the invention;

18 the mold core in the form of FIG. 17 in plan view,

19 shows a section along the line XIX-XIX in FIG. 18;

20 shows a channel shaped body with a removable socket insert;

21 shows a mold core of a mold according to the invention in another embodiment;

22 shows a further embodiment of a mold core of a mold according to the invention;

23 shows another embodiment of a mold core of a mold according to the invention; 24 shows the mandrel from FIG. 23 in a top view;

Figure 25 shows a detail of the mandrel of Figures 23 and 24;

26 shows an embodiment of a mold according to the invention;

27 shows an embodiment of a mold according to the invention;

28 shows a top view of a mold core of a mold according to the invention;

29 shows the mandrel from FIG. 27 in an exploded view;

30 shows another embodiment of a mold core,

FIG. 31 is a largely schematic top view of a mold core of a mold according to the invention;

32 is an exploded view of a mold core of a mold according to the invention;

33 is a side view of a shape according to the invention with a channel body with a socket shape insert; and

34 is a plan view of FIG. 33.

The known lower shaft part 1 shown in FIGS. 1 and 2 consists of a base plate 2 and a jacket 3. In the jacket 3, in the embodiment shown in FIGS. 1 and 2, an inlet opening 5 and an outlet opening 6 are provided diametrically opposite one another . A channel 9 is provided between the inlet opening 5 and the outlet opening 6, the bottom of which has a (slight) slope from the inlet opening 5 to the outlet opening 6 when the bottom part 1 of the shaft 1 is set up on a horizontal base with its base plate 2.

3 to 5 show a known lower shaft part 1, in which the inlet opening 5 and outlet opening 6 are arranged offset from one another, that is to say relative to one another with respect to the axis 11 of the lower shaft part 1 are not opposite. 3 and 4 show the manhole base 1 without the channel 9 produced by subsequent concreting. This is shown in FIG. 5 as a curved channel 9.

The jacket 3 of the known lower shaft part 1 has on its upper, free edge a training 10 corresponding to the spigot end of the sleeve of shaft rings and, in the exemplary embodiment shown, is of simple design so that a shaft ring formed with a corresponding counter step is secured against slipping on the side Manhole base 1 can be placed.

A shaft lower part 20 according to the invention shown in FIGS. 6 and 7 consists of a sole plate 2 and a casing 3, on the upper free edge of which the stepped formation 10 is provided, 3 openings 5 and 6 being provided in the casing are. Furthermore, the manhole base 20 according to the invention has a channel 9 leading from the inlet opening 5 to the outlet opening 6. According to the invention, this channel 9 has the special features described below.

The channel 9 is composed of a conical, widening upwards, e.g. conical or frustoconical recess 21, which is arranged concentrically to the axis 11 of the manhole base 20, and from two of this recess 21, leading to the inlet opening 5 and to the outlet opening 6 in the jacket 3 of the manhole base 2, for example channel-like or groove-like recesses 22 together. The lateral surface of the conical recess 21 simultaneously forms the inner surface 23 of the jacket 3 of the manhole base 20. The lower end of the conical recess 21 is at the same height as the deepest point (generatrix) 24 of the channel 9 and is rounded in the exemplary embodiment shown.

The upper edge of the recess 21 merges with an inclined surface 25, which slopes radially inwards, ie towards the axis 11 of the lower shaft part 20, into the upwardly widening surface 26 of the jacket 3, which leads to the free, upper one Edge of the lower shaft part 20 leads.

The recesses 22 lead to the inlet opening 5 and the outlet opening 6 from the central, conical recess 21, which is concentric to the axis 11 and which can also be pointed or flattened at its lower end. The recesses 22 run radially with respect to the axis 11 of the lower shaft part 20 Outwardly extending recesses 22 are composed of a lower section 30 (sole) bent in the exemplary embodiment shown and a section 31 which is open at the top and is delimited by two mutually parallel walls 32.

The manhole bottom part 20 according to the invention is a one-piece component that can be produced in a single work step, for example made of concrete, the channels 9 of which come from a central, conical recess 21 and from the recesses 22 leading away from this to the inlet opening 5 and the outlet opening 6 put together.

The special shape of the recess 21 and the recesses 22 results in a favorable shape of the channel 9, in which, due to the inclined inner surface 23, undesirable water accumulations such as occur on the surfaces next to the channel 9 in the known manhole rings 1 (see FIGS. 1 and 2) can occur, are avoided. Also is prevented by the shape of the channel 1 that 9 solids and the like in the lower shaft part 20 according to the invention in the region of the channel. get caught and lead to constipation.

The lower section 30 of the channel 9 merges smoothly into the inner end of the inlet opening 5 and outlet opening 6, as shown in FIG. 6 in its right half. The radius of the curvature of the inner surface in the lower region 30 of the channel 9 also corresponds to the radius of the inlet opening 5 and the outlet opening 6. The radius of the deepest section 30 of the recess 21, which is curved in the form of a dome, is also formed with this radius.

8, 9 and FIGS. 10, 11 show further exemplary embodiments of manhole bases 20 according to the invention, the differ from the exemplary embodiment shown in FIGS. 6 and 7 primarily by different angles of inclination of the inner surface 23 of the conical recess 21.

It can be seen that the design of a manhole base 20 according to the invention allows different embodiments, embodiments with an offset inlet opening 5 and outlet opening 6 are also conceivable, in which case the central or symmetry planes of the recesses 22 of the channel 9 are at an angle to one another, i.e. do not start from diametrically opposite points of the conical, central recess 21.

The construction according to the invention is also suitable for manhole bases 20 with more than two openings in the casing.

The special design of the channel 9 not only ensures favorable flow conditions for liquids through the lower shaft part 20, even if solids are carried along with the liquid (waste water), but also opens up the possibility of removing the lower shaft part 20 including its channel 9 Concrete or the like Produce material in a single operation.

A known form shown in FIGS. 12 and 13 for producing manhole bases 1 has a form jacket 111, a cylindrical form core 112 with wall 113 and cover 114. In the cover 114 of the form core 112, a ventilation device 115 can be provided to facilitate the demolding work. Turning pins 116 are fastened to the shaped jacket 111, so that the shape can be rotated about the axis 117 defined by the turning pins (lower shaft parts are concreted in the top-bottom position, that is, in such a way that the base plate 2 points upward). To form the step on the free edge of the wall 3 of the lower shaft part 1, a washer 118 is provided.

The socket mold inserts 119 are arranged with the aid of holding strips 120 at the points at which the inlet opening 5 and the outlet opening 6 are to lie in the finished lower part 1 of the manhole. Shaft lower parts 1 produced with the molds shown in FIGS. 12 and 13 do not yet have a channel 9 which has to be produced subsequently. For this purpose, the channel 9 must be shuttered and concreted. This is not only time-consuming, but also results in a non-monolithic design of the lower shaft part 1.

14 to 16 show a known mandrel 112, which is designed as a cylinder jacket with a lid. A channel body 121 is permanently welded to the cover of the mandrel 112. A second channel shaped body 122 is fastened to a cylindrical channel shaped body support 123 which is rotatably mounted on the cover of the shaped core 112. After loosening the tensioning screw, the channel body 124 attached to the cylindrical support 123 can be adjusted so that straight and angled channel 9 can be produced with the aid of the known mandrel 112 (manufacturer: Niemeyer Sons & Co. KG). However, it is also necessary in this embodiment to subsequently concrete the space initially taken up by the cylindrical channel body support 123, for which purpose a channel must be formed and filled with concrete. This saves no working time and creates a non-one-piece (monolithic) manhole base 1.

A mold 130 shown in FIG. 17 with a mold core 131 has a mold jacket 132, at the lower end of which the support ring 118 for the formation of the step is arranged on the free edge of the wall of the manhole base. Provided within the mold jacket 132 is the mold core 131, which tapers conically upwards and in the exemplary embodiment shown ends in a spherical cap-shaped upper end 133. The upper end 133 of the mandrel 131 can also be hemispherical. On the section 134 of the mold core 131, two channel mold bodies 135 are arranged which carry socket mold inserts 119 pointing outwards. The transition between the conical section 134 of the mandrel 131 and the lower substantially cylindrical or (as shown) conical part 136 is formed by an annular intermediate part 137 which is inclined to the axis 138 of the mold 130, so that in the finished, by means of Form 130 manufactured Lower shaft part gives a shoulder, the surface of which falls from the outside inwards downwards, so that water flowing down from above can flow into the center of the lower shaft part 1.

FIG. 18 shows a top view of the mandrel 130 with its conical section 134 and the two channel moldings 135 with the socket mold inserts 119. The shape of the channel mold body 135 can be seen from the sectional view of FIG. 19.

The channel shaped bodies 135 can, as indicated in FIG. 17, be formed inclined at their upper portion to the axis 138 by the topmost generator in the position of use being inclined to the axis 138. The channel defined by it has a slope from the inlet opening to the outlet opening.

If the channel shaped bodies 135 are removably arranged on the mold core 131, they can be replaced by differently shaped channel shaped bodies 135, so that manhole bases with different channel diameters or shapes can be produced.

In one embodiment, more than two channel form bodies 135 can be arranged on the mold core 131 if a manhole lower part with an inlet opening and two or three outlet openings is to be produced.

In the embodiment shown in FIG. 20, the socket mold inserts 119 are removably arranged on the channel mold body 135. In this case, a plug-in connection 140 is preferred which allows the mandrel 131 and the channel shaped bodies 135 to be pulled out of the manhole base as soon as possible after the production process, the socket body 119 remaining in the still bottom part of the manhole and serving as a support. This mode of operation and embodiment is particularly preferred when manhole bases are made of earth-moist concrete.

The mold core 131 can have a vent valve, in particular in its upper end, in order to close the formwork removal process facilitate.

FIG. 21 shows an embodiment of a mold core 131 according to the invention, which has a conical section 134 that has been divided once. The arrangement is such that one of the channel body 135 is attached to the lower portion 141 adjacent to the part 136, whereas the second channel body 135 is attached to the upper, rotatable portion 142. In this way, the angle between the channel shaped bodies 135 can be changed if manhole bases are to be produced in which the inlet opening is not diametrically opposite the outlet opening.

22 shows a preferred embodiment of the design of the mandrel 131 shown in FIG. 21. In the embodiment of a mandrel 131 according to the invention shown in FIGS. 21 and 22, the mandrel 131 consists of two parts, an upper part 142 and a lower part 141, the plates 144, 145, which are provided in the region of the division plane 143, abut one another. The parts 141 and 142 of the mold core 131 can be rotated relative to one another about an axis 146 which runs perpendicularly from top to bottom through the mold core 131. For this purpose, a screw nut 147 is provided on the plate 145 of the upper part 142. A screw bolt is inserted through a central hole in the base plate of the mandrel 131 and is screwed into the nut 147. When the screw bolt is tightened, the upper part 142 and lower part 141 of the mandrel 131 from FIGS. 21 and 22 are fixed to one another, so that a once-set relative position of the two channel shaped bodies 135 is fixed. After loosening the screw bolt, the upper part 142 and lower part 141 and thus the channel shaped body 135 fastened to it can be rotated relative to one another, so that the shaped core 131 can also be used for the production of lower shaft parts with a diametrically opposed inlet opening and outlet opening.

23 to 25 show in different views and in detail a further embodiment of a mandrel 131 according to the invention, which is subdivided once. It can be seen from the illustration in FIG. 23 that above the Cut 136 of the mandrel 131, a frustoconical section as the lower part 141 of the mandrel 131 and above this a spherical segment-shaped section as the upper part 142 of the mandrel 131 is arranged. 23, the channel body 35 on the right in FIG. 23 is rigidly connected to the lower part 141 of the mandrel 131 via a connecting piece 150. The flute shaped body 135 on the left in FIG. 23 is connected to the rotatable upper part 142 of the shaped core 131 and is guided so as to rest on the connecting part 137.

As the detail of FIG. 25 and the top view of FIG. 24 show, an arcuate slot 151 is provided in the intermediate part 137 of the mandrel 131, through which screw bolts are inserted, which are screwed into nuts 152 which are attached to a base plate 153 of the channel shaped body 135 are attached. In order to cover the sections of the arcuate slot 151 lying laterally next to the lower end of the channel shaped body 135, a curved grinding plate 154 is connected to the channel shaped body 135, which rests on the intermediate part 137, protrudes on both sides from the lower end of the channel shaped body 135 and ( 24) covers the areas of the slot 51 which are not below the channel shaped body 135, so that concrete cannot escape there.

In the embodiment shown in FIGS. 17 to 19, nuts 156 are fastened to the inside of substantially vertical walls 155 of the channel shaped body, into which nuts 156 can be fastened for fastening socket shape inserts 119 for forming the inlet and outlet openings.

FIG. 26 again shows a once-divided mold core 131 and its assignment to the mold jacket 132, a socket mold insert 119 being fastened to the channel mold body 135.

The division of the mandrel 131 into at least two parts

(Lower part, upper part) allows differently shaped upper parts to be placed on one and the same lower part in order to meet the respective existing requirements for the shape of the manhole lower part to be produced. Fig. 27 shows an embodiment of the mandrel 131 according to the invention, in which it is divided twice. With the aid of a central clamping screw 160, the parts (lower part 141, middle part 161, upper part 142) of the mold core 131 can be fixed to one another after they and the channel mold bodies 135 carried by them have been adjusted into the corresponding position (see FIG. 28). In the exemplary embodiment shown in FIG. 27, the one left channel shaped body 135 is connected to the upper part 142 of the mold core 131 and the right channel shaped body 135 in FIG. 27 is connected to the central part 161 of the mold core 131 by a welded connection.

FIG. 29 shows the individual parts of the mandrel shown in FIG. 27 in an exploded view.

In principle, it is also possible to subdivide the mandrel according to the invention more than twice, as shown in FIG. 30. The lower part 141 is not rigidly connected to the part 136 of the mandrel 131.

30 also shows that pneumatic or hydraulic clamping devices 170 can also be provided for locking the individual parts 136, 141, 161, 142 of the mandrel 131 to one another. In the exemplary embodiment shown, a pressure medium cylinder 171 is provided, the piston rod 172 of which is tensioned after the desired relative position of the channel body 135 relative to one another, so that the individual parts of the mold core 131 are fixed to one another in a non-rotatable manner.

Instead of the pressure medium (pneumatic) cylinder for fixing rotatable mold core parts to one another, a tensioning device 170 actuated by an electromagnet can also be provided.

The adjustment of the individual parts of a subdivided mold core 131 does not have to be done by hand; electromotive drives (pinion-rack drives 174, as indicated in FIG. 31 on the left or pneumatic or hydraulic cylinders 175, as indicated in FIG. 31 on the right) can also be used. be provided. If motor drives are provided for rotating the parts of mold cores 131, a control can be provided which drives move the channel mold bodies 135 into the respectively required position in accordance with a predetermined relative position between the inlet opening and the outlet opening.

The channel shaped bodies 135 can be curved (in plan view) if a curved channel formation is desired, as is shown in FIG. 5.

If the mold core 131 according to the invention is subdivided at least once, it is possible to use parts without a channel mold body 135 instead of the parts equipped with channel moldings 135 if this is necessary because of the manhole base to be produced. In particular, this can be provided, for example, in the embodiment of FIG. 30, where all three parts 141, 161, 142 of the mandrel

131 can be provided with channel shaped bodies 135 or only two or only one of them with channel shaped bodies 135.

A hemispherical or dome-shaped shape can be selected for the free ends of the channel body 135, on which the socket mold inserts 119 or the socket bodies attached to the socket mold inserts 119 are provided, so that if the socket connection pieces are shaped in opposite directions, a mobility corresponding to a ball joint is provided Sleeve form inserts 119 is given to the channel body 135. In this case, the lateral closure to the molded jacket has proven itself

132 out through appropriately adapted mirrors made of sheet metal, wood or the like. train. This makes it possible to adjust the socket mold inserts 119 (by a few degrees) relative to the channel shaped bodies 135.

An exemplary embodiment of sleeve form inserts 119 movably attached to channel shaped bodies 135 is shown in FIGS. 33 and 34. In the exemplary embodiment shown in FIGS. 33 and 34, dome-shaped holding plates 190 are fastened to the externally facing surfaces of the channel shaped bodies 135 via tubular intermediate pieces. A nut screw 192 is inserted through a hole in the middle of the holding plates 190. The Socket mold inserts 119 have a dome-shaped counterplate 193 on their end facing the channel shaped bodies 135 or the holding plates 190 attached to them, which is congruently curved to the holding plate 190. In the middle of the counter plate 193 of the socket mold insert 119, a hole 194 is provided through which the bolt of the nut screw 192 engages with play on all sides.

After loosening the nut of the nut screw 192, the socket mold insert 119 can be pivoted in any direction within the limits predetermined by the size of the opening 194 relative to the channel mold body 135. As soon as the socket mold insert 119 has assumed the desired position, the nut of the nut screw 192 is tightened and presses the counterplate 193 of the socket mold insert 119 against the holding plate 190 via the washer 195, so that the socket mold insert 119 is securely fixed.

The channel body 135 can be welded, screwed or fastened to a conical or hemispherical mandrel 131 or to parts thereof or fastened by means of a plug connection. An example of a releasable connection of channel shaped bodies to a mold core 131 or parts 141, 161, 142 of the same is shown in FIG. 32. There is a guide shoe 180 attached to the parts 142 and 161 of the mold core 131, which leaves two lateral grooves 181 free, into which projections 182 engage the edge of the channel mold inserts 135 resting on the mold core 131, so that these can be fixed by sliding them on.

An embodiment of a manhole base according to the invention can be described as follows:

A manhole base 20 with a base plate 2 and a jacket 3 has a channel 9 connecting an inlet opening 5 with an outlet opening 6. The channel 9 is composed of a recess 21 which is arranged concentrically with the axis 11 of the manhole bottom part 20 and widens conically upwards and two of these groove-like recesses 22 leading radially outward to the inlet opening 5 and the outlet opening 6 men.

For the manufacture of such manhole bases 20, a form is proposed which has an essentially cylindrical casing 132 and a form core 131. The mandrel 131 has a frustoconical portion 134 tapering upward in the position of use, the upper end 133 of which is hemispherical. To form the channel 9 in the lower shaft part 20, two channel bodies 135 are provided on the mold core 131. The channel form bodies 135 carry socket form inserts 119.

Claims

Claims:

1. lower shaft part (20) with a base plate (2), a jacket (3), at least two openings (5, 6) provided in the jacket (3) and with one of the openings (5, 6) connecting one another with recesses (22 ) in the bottom plate (2) formed channels (9), wherein the upward-facing surface of the bottom plate (2) has a substantially conical recess (21) concentric to the axis (11) of the lower shaft part (20), characterized in that the conical recess (21) of the manhole base (20) together with the recesses (22) extending from it and leading to the openings (5, 6) in the casing (3) of the manhole bottom part (20) the channel (9) of the manhole bottom part (20 ) and that the lower end (24) of the conical recess (21) is at the same height as the deepest point (24) of the openings (5, 6) in the casing (3) of the manhole base

(20) leading recesses (22).

2. Manhole base according to claim 1, characterized in that the recess (21) is flattened at its deepest section.

3. Manhole base according to claim 1, characterized in that the recess (21) is curved at its deepest section (30).

4. Manhole base according to claim 1, characterized in that the recess (21) is tapered at its deepest section.

5. Manhole base according to claim 3, characterized in that the radius of curvature of the deepest section (30) of the recess (21) is the same size as the radius of the inner end of the opening (5, 6).

6. Manhole base according to one of claims 1 to 5, characterized in that the recesses (22) leading to the openings (5, 6) with respect to the central axis (11) of the lower shaft part (20) run radially.

7. Manhole base according to one of claims 1 to 6, characterized in that the recesses (22) leading to the openings (5, 6) are groove-like or groove-like, upwardly open depressions.

8. Manhole base according to one of claims 1 to 7, characterized in that the recesses (22) leading from the recess (21) to the openings (5, 6) in their upper region (31) of two mutually parallel, flat surfaces ( 32) are limited.

9. Lower shaft part according to one of claims 1 to 8, characterized in that the recesses (22) leading from the recess (21) to the openings (5, 6) are flattened in their lower section.

10. Manhole base according to one of claims 1 to 8, characterized in that the recesses (22) leading from the recess (21) to the openings (5, 6) are tapered in their lower section.

11. Manhole base according to one of claims 1 to 8, characterized in that the recesses (22) leading from the recess (21) to the openings (5, 6) have a circular cross-sectional shape in their lower section (30).

12. Manhole base according to claim 11, characterized in that the radius of the circular cross-sectional shape in the lower region (30) of the recesses (22) leading from the recess (21) to the openings (5, 6) has a radius which is the same size like the radius of the inner end of the openings (5, 6).

13. Manhole base according to one of claims 1 to 12, characterized in that the inner surface (23) of the recess (21) via a shoulder (25) into a surface leading to the free, upper edge of the manhole base (20). before (26) passes.

14. Lower shaft part according to claim 13, characterized in that the shoulder (25) to the axis (11) of the lower shaft part (20) is formed sloping.

15. Manhole base according to claim 13 or 14, characterized in that the surface (26) leading to the free upper edge of the manhole bottom part (20) is an upwardly flared conical surface.

16. mold (130) for producing manhole bases (20) in the top-top position, in particular for producing manhole bases according to one of claims 1 to 15, with a mold jacket (132) and a mold core (131), one on the mold core ( 131) arranged channel form body (135) for the formation of the channel (9) and with socket form inserts (119) for the formation of at least one inlet opening and at least one outlet opening in the wall (3) of the manhole base (120), which are connected to the channel form body (135 ) are arranged on the surfaces (155) facing away from the mold core (131), the mold core (131) for forming the bottom (2) of the manhole bottom part (120) to be produced having a hemispherical or spherical cap region (133), and wherein the channel shaped body (135) has two side wall parts which lead to the mold core (131) and which are connected in the position of use by a wall part at the top, characterized in that the mold core (131) e In the position of use of the form (130) adjoining the hemispherical or spherical cap-shaped region (133) below, the frustoconical region (134), which widens towards the bottom, has that the channel shaped body for forming the channel (9) from at least two There are channel shaped bodies (135) which rest with their side wall parts both on the hemispherical or spherical cap-shaped region (133) and on the frustoconical region (134) of the mandrel (131), and that the top generators of the mold (130) in the position of use Channel shaped body (135) in the area of the the position of use at the upper end of the hemispherical or spherical cap-shaped region (133) of the mold core (131) are arranged.

17. Mold according to claim 16, characterized in that a cylindrical or conical section (136) of the mold core (131) adjoins the larger-diameter end of the mold core (131), one between the mold core (131) and the section (136 ) arranged annular connecting part (137) is formed inclined to the axis (138) of the mandrel (131).

18. Mold according to claim 16, characterized in that the sleeve mold inserts (119) relative to the channel shaped bodies (135) are movable, in particular pivotable.

19. Mold according to claim 16 or 18, characterized in that the sleeve mold inserts (119) on the channel shaped bodies (135) are releasably attached.

20. Mold according to claim 19, characterized in that the sleeve mold inserts (119) on the channel shaped bodies (135) are fastened by a plug connection (140).

21. Mold according to one of claims 16 to 20, characterized in that the side wall parts of the channel body (135) run parallel to each other and that the wall part connecting the side wall parts is bent.

22. Mold according to one of claims 16 to 21, characterized in that the channel body (135) in plan view, i.e. are curved when viewed from above in the position of use of the mold (130).

23. Mold according to one of claims 16 to 22, characterized in that the channel body (135) in plan view, ie in the position of use of the mold (130) are straight as seen from above.

24. Form according to one of claims 16 to 23, characterized in that the position of the channel shaped body (135) is mutually variable.

25. Form according to claim 24, characterized in that a channel body (135) is stationary and the other channel body (135) is movably arranged.

26. Form according to claim 25, characterized in that the movable channel body (135) on the conical

Section (134) of the mandrel (131) with the section

(136) the same connecting annular intermediate part

(137) rests and is guided.

27. A mold according to claim 26, characterized in that a curved slot (151) is provided in the intermediate part (137), which is penetrated by retaining screws for the movable channel shaped body (135).

28. Form according to claim 27, characterized in that the side of the channel shaped body (135) on the annular surface (137) lying abrasive plates (154) are arranged with a circular ring shape, which cover areas of the slot (151) not covered by the channel shaped body (135).

29. Mold according to one of claims 16 to 28, characterized in that the end walls (155) facing away from the mold core (131) of the channel mold body (135) are aligned parallel to the axis (146) of the mold core (131).

30. Mold according to one of claims 16 to 29, characterized in that the mandrel (131) is divided at least once.

31. Mold according to claim 30, characterized in that the upper hemispherical or spherical section (142) on the lower frustoconical section (141) of the mandrel (131) is arranged interchangeably and / or rotatably.

32. Mold according to claim 31, characterized in that at least one channel body (135) is attached to the upper part (142) of the mandrel (131) and is adjustable, in particular pivotable, with the other channel body (135).

33. Mold according to claim 31 or 32, characterized in that a clamping device (160, 170) is provided for fixing the upper section (142) of the mold core (131) at the lower section (141) thereof.

34. Mold according to claim 33, characterized in that the clamping device is a clamping screw (160), a clamping cylinder (171), an electromagnetic tension anchor or the like.

35. Mold according to one of claims 30 to 34, characterized in that motor drives (174, 175) are provided for the relative rotation of the sections (142, 141, 161) of the mold core (131).

36. Mold according to claim 35, characterized in that the motor drive is a rack and pinion drive (174), a pressure medium motor (175), or the like. is.

37. Mold according to one of claims 30 to 36, characterized in that the mandrel (131) is divided twice.

38. Mold according to one of claims 30 to 37, characterized in that the lower part (141) of the conical section (134) of the mandrel (131) is connected to the section (136), that at the central section (161) one of the channel body (135) and the other section of the channel body (135) is arranged on the upper section (142).

39. Mold according to one of claims 16 to 38, characterized in that the channel body (135) on the mold core (131) are fastened by plug connections (180).

40. Mold according to one of claims 16 to 38, characterized in that the channel shaped body (135) on the mold core (131) are fastened by a welded connection.

41. Mold according to one of claims 16 to 40, characterized in that more than two, preferably three channel-shaped bodies (135) are arranged on the mold core (131).

42. Mold according to one of claims 16 to 41, characterized in that the upper end faces of the bottom part (120) of the manhole bottom (120) to be produced facing the channel body (135) to the axis (138) of the mandrel

(131) are inclined according to the slope of the channel (9) in the manhole base (120) to be manufactured.

43. Mold according to one of claims 18 to 42, characterized in that the surfaces (155) of the channel form inserts (135) facing the socket form inserts (135) are spherical or spherical cap-shaped and in that the connecting pieces of the socket form inserts (119) are constructed in opposite directions. so that the sleeve inserts (119) are movable in the manner of a ball-and-socket joint with respect to the shaped channel bodies (135).