METHOD FOR PRODUCING CONCRETE PIPES

Abstract

A method for producing concrete pipes in a vertical casting mould comprising a moulding space (4) between a core (2) and a mantle (3) divided lengthwise and comprising mould sleeves (5, 9) which terminate the moulding space (4) at the bottom and at the top is described, wherein pourable concrete is poured into the moulding space (4) and the pipe body (7) is demoulded after setting of the concrete by opening the mantle (3). In order to be able to cast high-quality concrete pipes, it is proposed that the pourable concrete is poured into the moulding space (4) in a predetermined quantity when the upper mould sleeve (9) is removed and that the upper mould sleeve (9) forming a closed ring is pressed in a shaping manner into the end face of the pipe body (7) only after a setting time for a predefined setting volume of the cast pipe body (7) between the core (2) and the mantle (3).

Claims

1. A method for producing concrete pipes in a vertical casting mould, said method comprising: providing a core and a mantle that is divided lengthwise, said core and mantle defining a moulding space therebetween, and mould sleeves that terminate the moulding space at a bottom and a top thereof; pouring pourable concrete into the moulding space so as to form a pipe body; demoulding the pipe body after setting of the concrete by opening the mantle; and wherein the pourable concrete is poured into the moulding space in a predetermined quantity with the upper mould sleeve is removed; and pressing the upper mould sleeve forming a closed ring in a shaping manner into an end face of the pipe body only after a setting time for a predefined setting volume of the cast pipe body between the core and the mantle.

2. The method according to claim 1, wherein the upper mould sleeve is pressed into the pipe body between the core and the mantle and turned about an axis thereof.

3. A method for producing concrete pipes in a vertical casting mould, said method comprising: providing a core surrounded by a mantle, said mantle being divided lengthwise thereof, said core and mantle defining a moulding space therebetween, and said mantle having mould sleeves that define top and bottom terminal ends of the moulding space, the upper mould sleeve forming a closed ring; pouring a predetermined quantity of pourable concrete into the moulding space with the upper mould sleeve removed so as to form a pipe body; after a setting time for a predefined setting volume of a cast pipe body formed between the core and the mantle is elapsed after said pouring, shaping an end face of the cast pipe body by pressing the upper mould sleeve into the end face of the cast pipe body; and demoulding the pipe body after setting of the concrete by opening the mantle.

4. The method according to claim 3, wherein the upper mould sleeve is pressed into the pipe body between the core and the mantle and turned about an axis thereof.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0008] The method according to the invention is explained in detail with reference to the drawings. In the figures:

[0009] FIG. 1 shows a casting mould for carrying out a method of production according to the invention for concrete pipes in an axial section with an upper mould sleeve raised from the moulding space directly after filling with pourable concrete,

[0010] FIG. 2 shows the moulding space between core and mantle of the casting mould in sections in the region of the upper mould sleeve after the setting process of the pipe body made of pourable concrete in a larger scale and

[0011] FIG. 3 shows a view corresponding to FIG. 2 of the casting mould after the shaping pressing of the upper mould sleeve into the pipe body.

DESCRIPTION OF THE PREFERRED EMBODIMENT

[0012] As can be deduced in particular from FIG. 1, a casting mould for carrying out the wet concrete casting method according to the invention to produce a concrete pipe has a base 1 with a core 2 and a mantle 3 between which and the core 2 an annular moulding space 4 is formed. At the bottom this moulding space 4 is terminated by a mould sleeve 5 which rests on the base 1 and combined with the mantle 3 provides for the formation of an extended sleeve 6 at the lower end of the pipe body 7 made of concrete. A separate upper mould sleeve 9 in the form of a closed ring which is inserted coaxially to the casting mould between the core 2 and the mantle 3 under pressure into the annular space 4 and preferably can be rotated about its axis is used to form a recessed coupling attachment 8 which is complementary to the sleeve 6, and which can be seen from FIG. 3 at the opposite end of the pipe body 7.

[0013] For demoulding a concrete pipe which has been produced, usually both the core 2 and also the mantle 3 are divided lengthwise. Whilst the mantle 3 must be withdrawn radially outwards from the concrete pipe to be demoulded, the core is to be drawn radially inwards to release the pipe body 7. This is achieved in a manner known per se whereby the longitudinal edges of the divided circumferential wall of the core 2 which run parallel to one another at a distance in the circumferential direction in the usage position of the core are pulled towards one another. In the case of a conical core configuration, a division of the core which is otherwise required can also be omitted. The longitudinal edges of the divided mantle 3 which abut against one another in the usage position of the mantle 3 are accordingly pulled apart. In the case of a one-piece design, the mantle 3 is thus widened whilst in the case of a two-part design the two mantle halves are pulled apart.

[0014] In order to produce a concrete pipe, pourable concrete is poured in a predefined quantity matched to the pipe to be produced into the moulding space 4 between the core 2 and the mantle of the casting mould when the upper mould sleeve 9 is raised usually from above according to FIG. 1. In special cases however a pressing of the pourable concrete through a mantle opening into the moulding space 4 is possible. Before the upper mould sleeve 9 is pressed into the pipe body 7 onto pourable concrete to form a coupling attachment 8, a setting of the pipe body 7 is awaited. During this setting time the filling level of the moulding space 4 according to FIG. 2 drops from an initial level 10 indicated by a dot-dash line to a level 11 accompanied by compaction of the concrete. In order to shorten the setting time, the mantle and/or the core can be provided with a shaking drive.

[0015] The air bubbles enclosed in the pourable concrete can escape upwards from the moulding space 4 during this setting time so that during the subsequent pressing of the upper mould sleeve into the pourable concrete between the core 2 and the mantle 3 the coupling attachment 8 is formed free from pores with smooth wall surfaces. Care should merely be taken to ensure that the air collecting above the pipe body 7 during insertion of the upper mould sleeve 9 into the moulding space 4 can escape from the mould sleeve 9 which is ensured by the necessary guide gap between the upper mould sleeve 9 and the core 2.

[0016] After a setting of the concrete necessary for demoulding, the pipe body 7 can be demoulded by opening the mantle 3 and pulling it apart radially outwards and pulling the core 2 radially in. The upper mould sleeve 9 can remain on the pipe body 7 during the demoulding but can also be removed beforehand.