DE2952540A1 - Lined concrete pipe prodn. method - delivers hardening material between lining and pipe before latter has set - Google Patents

Abstract

The method produces a concrete pipe with corrosion-resistant lining. A thin-walled tube forming the lining and of corrosion- resistant material such as PVC is inserted in the concrete pipe and the intervening space filled with hardening material such as cement. This material is delivered into the intervening annular space at a moment when the concrete of the pipe has not yet set. It can be injected under pressure, and while the concrete pipe is still enclosed in shuttering, the tube being stiffened by an internal core. The inner pipe surface can be roughened before insertion of the material.

Description

Method for manufacturing a concrete pipe with corrosion

Resistant Lining The invention relates to a method for the production of a concrete pipe with a corrosion-resistant lining according to the preamble of claim 1.

To improve the resistance of concrete pipes to aggressive Various solutions have become known to media, such pipes with a corrosion-resistant To provide lining. In particular, a pipe composite body is made of an outer Pipe made of steel or cast iron, one attached to its outside with a force fit Provided with cams, organic polymeric inner layer and an intermediate layer from one that is flowable at the time of introduction, but later becomes rigid Materials, preferably cement mortar, known (DE-OS 26 05 422). With this pipe composite body should the cams of the inner layer not only anchor themselves in the intermediate layer, but also serve to center the inner layer with respect to the outer tubular body.

Furthermore, a concrete pipe is known in which the lining is made of a thin-walled inner tube made of plastic, e.g.

PVC, and the annulus between the inner pipe and the concrete pipe is foamed with polyurethane foam (DE-GM 78 15 282). Because the Polyurethane foam used as a bonding agent during hardening on the one hand with the Concrete pipe and on the other hand connects to the inner pipe made of plastic, should in the final state a monolithic round body is created. Apart from the foaming Such an annular space is technically difficult with the available pipes is, satisfies the connection between polyurethane foam in this known pipe and concrete pipe not.

The invention is accordingly based on the object, taking into account the material properties of a concrete pipe are technically and functionally flawless as well as economically producible pipe composite bodies.

According to the invention this object is achieved by the features of the characterizing part Part of claim 1 solved.

Advantageous further developments result from the subclaims.

The advantage of the method according to the invention is in addition to the use uniform materials for the actual pipe body seen above all in that after filling the annulus with cement mortar at a time takes place, to which the outer concrete pipe has not yet set, the filler material intimately connects with the fresh concrete, so that a monolithic concrete cross-section arises.

It is advantageous if the inner surface of the freshly stripped concrete pipe is roughened, so that the filling material is even easier in the capillary openings the fresh concrete can penetrate. When filling the annulus under pressure happens, for example by way of injection, take the fresh concrete surrounding External formwork of the concrete pipe and a core supporting the lining pipe the counterpressure on.

The preferred material for filling the annular space is cement mortar used, its injection into narrow spaces on the one hand common in construction and is accordingly controllable and which is already special due to the same structure connects well with the immediately demoulded fresh concrete of a stiff consistency. It can but also a plastic mortar or plastic alone can be used, which, especially when it is introduced under pressure, on the roughened inner surface of the concrete pipe penetrates into the capillary openings of the earth-moist fresh concrete and also creates a good bond.

The invention is illustrated below with reference to one in the drawing Embodiment explained in more detail.

It shows Fig. 1 a partial cross section and Fig. 2 a Partial longitudinal section along the line II-II in Fig. 1 through a manufactured according to the invention Composite pipe.

In the one in FIGS. 1 and 2 in a partial cross-section or partial longitudinal section The state shown is the freshly made concrete pipe 1 is still inside of the outer formwork 2. This is a condition that occurs in the case of concrete with a stiff consistency is referred to as "immediate switch". The inner surface 3 of the concrete pipe 1 can be roughened be.

Inside the concrete pipe 1 there is a small distance therefrom an inner pipe 4 forming the lining, e.g.

made of PVC supported by a core of which only the one on the pipe 4 adjacent inner formwork 5 is shown. The inner tube 4 is on its inside provided with ribs 6, which have interruptions 7 (Fig. 2) at certain intervals, for better penetration of the filling material into all cavities of the annular space between the concrete pipe 1 and the inner pipe 4 to enable.

In the annular space between the inner surface of the concrete pipe 1 and the outer surface of the inner pipe 4 is now as early as possible at which the fresh concrete the concrete pipe 1 is solidified so far that it is stable without internal formwork, but has not yet set, a filler material 8 is introduced. Appropriately cement mortar is used for this, which is introduced under pressure, i.e. injected will. The process of injecting annular spaces is in prestressed concrete construction, e.g. in Injecting tendon channels, known. The injection mortar penetrates into the Capillaries of the still fresh concrete pipe 1, creating a particularly intimate connection and a homogeneous load-bearing behavior is achieved.

Instead of pure cement mortar, a plastic mortar, even pure plastic can be used, e.g. a plastic foam that is foamed in the annular space.

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Claims (4)

Method of making a concrete pipe with corrosion-resistant Lining patent claims Q) proceed to manufacture a concrete pipe with corrosion-resistant Lining in which a thin-walled lining is inserted into the concrete pipe Pipe made of corrosion-resistant material, e.g. PVC, set and the remaining one Annular space with hardening material, mainly Cement mortar, filled in is, characterized in that the hardening material in the annular space to one Time is introduced at which the fresh concrete of the concrete pipe has not yet set Has. 2. The method according to claim 1, characterized in that the hardening Material is pressed in (injected) under pressure. 3. The method according to claim 2, characterized in that the pressing takes place at a time when the concrete pipe is still surrounded by formwork on the outside and the pipe forming the lining is internally stiffened by a formwork core is. 4. The method according to any one of claims 1 to 3, characterized in that that the inner surface of the concrete pipe before the introduction of the hardening material is roughened.