EP1741532B1 - Method for manufacturing a manhole - Google Patents

Description

The invention relates to a method for producing a manhole base made of concrete with individually designable channel using a mold with a mold core surrounded by a mold core, on which at least one channel of the manhole bottom predetermining reusable moldings is placed on the preferably a demolding aid forming separating medium is applied, a concrete mixture filled into the mold and the manhole base thus produced is removed from the mold after at least partial consolidation.

A corresponding method is the DE-A-103 17 321 refer to. The molded body, which may be composed of individual segments, consists in particular of a rigid foam plastic, which is removed from the finished manhole base as is knocked out. If the individual segments or the shaped body have a rough surface, a cut film or a liquid or pasty substance can be applied to this, which facilitates demolding. Independently of this, the molded body or its segments are arranged directly on the preferably roof-shaped inclined outside of the bottom of the mold core and releasably connected, for example by means of screws.

Disadvantage of the known method is that the removal of the molding often leads to problems. It should also be noted that, depending on the one of the material of the non-reusable shaped body and on the other hand of the applied concrete mass, a partial compression of the shaped body takes place, so that a reworking of the channel after demolding of the manhole base is required.

From the AT-U-001 821 is known a mold for the manufacture of manhole bases. In this case, the mandrel has a tapering towards the bottom of the manhole base to be produced shape, wherein at least two Gerinneformkörper are provided adjacent to the outer surface of the mandrel.

The EP-B-0 755 760 relates to a method for producing a manhole base made of concrete, according to the preamble of claim 1 and an apparatus for forming sewer manholes, wherein the manhole and flumes form a monolith. To form the channel, several molds forming a mold are arranged on the mold core, via which the gradient of the channel is predetermined.

For the production of sewer manholes prefabricated shaft bottoms can be used, which can be used in existing Schalumgssysteme. The shaft bottoms are made separately from the manholes, so that a storage is required to produce manholes with individual course and inclination of the channel or the berm (see prospectus PRECO, ZNL PV Holding AG, D-31600 Uchte). In this case, the shaft bottom shaft inside of polyurethane and has on the back a Splitting with this protruding reinforcement.

Of the US-A-5,383,311 is to take a lining for a concrete shaft, which is initially manufactured independently as a self-supporting component. Then, for the production of the concrete shaft between the liner and the shell of a mold concrete is filled.

A plastic molding as a lining or cover element is the DE-A-28 55 201 refer to.

After US-B-6,223,475 A concrete shaft is provided with a lining which is produced separately from the concrete shaft.

A concrete shaft will after the US-A-5,271,193 provided on the inside with a fiberglass-containing layer to allow protection against liquid or corrosive gases.

Of the US-A-3,340,126 a plastic-lined tank can be seen.

To rehabilitate a shaft is after the DE-B-103 15 560 in this a tube introduced, which is rolled out within the shaft.

The present invention has for its object to provide a method of the type mentioned in such a way that can be made on site shaft floors with customizable gutter and Bermenverlauf, with rework after removal from the mold or other work on the manhole base, as far as its berm and flume affected are not required.

The object is achieved essentially by the fact that on the reusable molding a bottom of the manhole base forming in the form of hardening soil layer is applied to the directly or indirectly, the concrete mixture is poured into the mold. Indirectly means that on the soil layer before its curing, a connection to the concrete enabling compound layer is applied.

In particular, a Bermendeckel and one or more of the channel predetermining mold elements are arranged on the mandrel, wherein the Bermendeckel forms with the or the mold elements, the shaped body.

Notwithstanding the prior art, reusable moldings are used to form the berm and the channel so that less storage is required. At the same time there is the advantage that the moldings can be made extremely stable, so that the risk that a deformation occurs during the filling of the concrete is excluded. It is furthermore of particular advantage that the shaped body comprises a reusable Bermendeckel, so that regardless of the design of the surface of the mandrel desired inclinations of the berm are easily produced.

Due to the fact that the soil layer does not have to carry any supporting effect in comparison to layers with prefabricated soils, it is possible to dispense with additional reinforcing measures during casting.

After demolding of the manhole base no further processing is required in the region of the bottom of the manhole base, so that it is particularly excluded that damage to the channel takes place, a disadvantage that is given when knocking out the shaped body according to the generic state of the art. At the same time, the berm and the channel may consist of a material that is designed for the use of manhole base, so z. B. is chemically resistant or resistant to service water.

Compared to the prefabricated shaft bottoms there is the advantage that directly on site using a modular design, a composition of the moldings and thus an individual design of the manhole base can be done so that cost savings are given. It is also unnecessary to transport prefabricated shaft bottoms to the production locations of the manhole bases.

In a further development of the invention, it is provided that a plastic material for forming the bottom layer is applied to the shaped body as is sprayed on. This results, as mentioned, in the advantage that an individual design of the manhole base takes place in dependence on the use of the manhole base, that is to say a design takes place on the liquid flowing through the manhole base. In particular, however, polyurethane can be used as the plastic material.

In order to achieve a good connection between the concrete to be bonded and the bottom layer, it is further provided that before filling the concrete in the connecting layer z. B. in the form of a Besplittung or sanding and / or in the soil layer is introduced in sections in this extending reinforcement. This can be one or more iron wires such as spirals.

If a connecting layer, which is intended to ensure a good bond between the soil layer and the concrete, is not provided, then the reinforcement is based solely on the soil layer.

Since the reusable molded body is of high stability, that is, the bottom layer does not have to perform self-supporting function in producing the manhole base, as is the case with the prefabricated manhole bottoms separately manufactured according to the prior art and to be transported to the manufacturing location of the manhole base, the bottom layer can be formed relatively thin.

In this case, the invention provides, in particular, for the bottom layer to be applied with a thickness d of 1 mm ≦ d ≦ 10 mm, in particular 2 mm ≦ d ≦ 8 mm.

As the release agent itself, a silicone material can be used, which can also be brushed or sprayed onto the molding. The use of films or other suitable materials is also possible. However, if the bottom layer itself ensures that a problem-free demolding of Schachtunteils is possible, can be dispensed with the release agent.

Further details, advantages and features of the invention will become apparent not only from the claims to be taken in these features - alone and / or in combination - but also from the following description of a drawing to be taken preferred embodiment,

Fig. 1:

einen Schnitt durch eine Form zur Herstellung eines Schachtunterteils mit eingefülltem Beton und

Fig.2:

einen Ausschnitt der Anordnung gemäß Fig. 1.

Show it:

Fig. 1:

a section through a mold for producing a manhole base with filled concrete and

Figure 2:

a section of the arrangement according to Fig. 1 ,

In the Fig. 1 a mold 10 for producing a sewer manhole base is shown. The mold 10 consists in a known manner from a mold shell 12, which surrounds a mandrel 14. Height-adjustable inserts 16 may be provided in the floor area in order to make the upper edge of the manhole base part to the desired extent.

The mold jacket 12 may consist of steel or fiberglass reinforced UP in the usual way. The same applies to the mold core 14th

In order to design a manhole base on site individually with respect to the berm and the channel, the invention provides that on the mandrel 14, a reusable molded body 18 is arranged, which may be made of plastic or metal, for example. The molded body 18 comprises a Bermendeckel 20 and Course and geometry of the channel or the vorgebendes essay chute 22. In this case, the Bermendeckel 20 and the attachment chute 22 may be separate components or integrally formed.

From the ends of the attachment chute 22 go socket connections 24, which are individually interpretable in their dimensions and depending on the use of manhole base to be produced. Muff connectors 24 and attachment chute 22 may also be composable components.

After arranging the one-part or multi-part molded body 20, a separating layer 26 is preferably applied to it. This is in particular a substance based on silicone. The release layer 26 may be brushed or sprayed on. The use of release liners is also possible.

Then, a bottom layer 28 is applied, the material is designed for the application of the manhole base. In particular, the bottom layer 28 is made of plastic, preferably polyurethane is mentioned. The bottom layer 28 is preferably sprayed on.

Prior to curing the bottom layer 28, it may be split or sanded to form a tie layer 30 which ensures good bonding to the concrete 32 to be poured into the mold 10. In addition, a reinforcement 34 may preferably be introduced in the form of iron spirals, which extends in regions both in the bottom layer 28 and the Besetzung or Besandung. Subsequently, the concrete 32 is filled in the mold 10.

After the necessary setting of the concrete 32 then takes a demolding, wherein the shaped body 20 can be easily removed from the manhole base, to then be used for the production of another manhole base again.

The layers 26, 28 30 should preferably have the following thicknesses or consist of the following materials: Separation layer 26: 0.01 mm to 1.0 mm Silicone-containing release material, release wax, release oils, release film Soil layer 28: 1-10 mm, preferably 2 to 8 mm Polyurethane, glass fiber reinforced unsaturated polyester resins (GS-UP) or other thermosets Connection layer 30: 1 mm to 6 mm preferably formed by splitting or Besandung.

As a material for the molding, in particular steel or plastic come into question. In this case, there is also the possibility that the molded body is composed of individual parts, wherein plug-in, screw or magnetic connections are preferred to call to connect the parts.

With regard to the reinforcement, it should be noted that its thickness or its diameter should be at least 3.8 mm.

Claims (10)

1. Method for making a manhole bottom section of concrete with individually designable channel using a mold (10) with a mold core (14) surrounded by a mold shell (12), on which core is arranged at least one reusable mold body (18) predetermining the channel of the manhole bottom, on which mold body is preferably applied a separation medium (26) forming a mold removal aid, where a concrete mixture is being poured into the mold and the manhole bottom section thus made is removed from the mold after at least partial solidification,
   wherein
   a bottom layer (28) forming a bottom of the manhole bottom section and setting inside the mold is deposited onto the reusable mold body (18), onto which bottom layer the concrete mixture is poured indirectly or directly into the mold.
2. Method according to Claim 1,
   wherein
   a connecting layer (30) permitting a connection to the concrete (32) is deposited onto the bottom layer (28) before it sets.
3. Method according to Claim 2,
   wherein
   a gravel or sand layer is used as the connecting layer (30).
4. Method according to at least one of the preceding claims,
   wherein
   a berm cover (20) is arranged on the mold core (14) and on said berm cover one or more mold elements (22) predetermining the channel are arranged, where the berm cover with the mold element(s) form the mold body (18), where preferably the berm cover and the mold element(s) are designed integrally and in particular a mold body of plastic or metal such as steel is used.
5. Method according to at least one of the preceding claims,
   wherein
   a plastic material is deposited onto the mold body to form the bottom layer, where in particular the plastic material is sprayed into the mold body.
6. Method according to at least one of the preceding claims,
   wherein
   polyurethane is used as the plastic material.
7. Method according to at least one of the preceding claims,
   wherein
   a multi-part body is used as the mold body (18), the parts of which are connected by plug, bolted or magnetic connection.
8. Method according to at least one of the preceding claims,
   wherein
   before pouring of the concrete mixture into the connecting layer (30) such as gravel or sand and/or into the bottom layer (28), a reinforcement extending in sections inside said connecting or said bottom layer is emplaced, where one or more iron wires such as coils are preferably used for the reinforcement.
9. Method according to at least one of the preceding claims,
   wherein
   the bottom layer (28) is deposited with a thickness d of 1 mm ≤ d ≤ 10 mm, in particular 2 mm ≤ 8 mm.
10. Method according to at least one of the preceding claims,
    wherein
    a silicone material is used as the separation medium.

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