DE1625975A1 - Cement pipe - Google Patents

Description

.PATENTANWÄLTE 1705 "- I -6571

DIPL-ING. E. SPLANEMANN 16259 ^ S dipl- inq. J. JUDGE

8 MONKS 2 '2 HAMBURQ 36

Theatinerstraße 33/34 Neuer Wall 10 Telegram addr .: Imrenllut MOndien Telegram addr. · Invenllus Himburg Telephone C0811I 216 * 07 Telephone: (0 * 11) 347900

Munich, October 24, 1967

John Davron Limited
Maudling Works, Naas, County
Kildare, Ireland

Patent application

Cement pipes

The invention relates to cement pipes

Are cement pipes used where a significant load can be placed on them, such as when they are in are embedded in the ground to a considerable depth, they may be compressed, as a result of which breaks occur on the top and bottom and occasionally in between.

It is the main object of the invention to provide a pipe made entirely of cement which reinforces a pipe Has resistance to forces that could cause the pipe to be compressed

According to the present invention, a whole consisting of cement pipe is provided which has an inner ο concrete upper surface and * oo is characterized by an outer layer which _ω reinforced by a non-oxidizable fibrous material! Comprised Donerdezement
- «*
ο

w When used in this description, the term ** ·

n> druak alumina cement cement ©, which contain more than 25 percent by weight alumina (Al ₂ O-). In particular, it is

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among those used in connection with this invention Cements include high alumina cements of not less than 32 weight percent alumina, for example the alumina cement used can be based on bauxite.

The calcium aluminate cement is preferably made of glass fibers or alternatively reinforced with synthetic resin fibers or asbestos fibers.

The present invention also includes a method for Production of a pipe made entirely of cement, which includes the following steps! Forming separate lengths of a concrete pipe, after setting, pushing it forward these pipe lengths along a central dome on a circumferential head for wrapping the pipe with a non oxidizable fibrous material over, application of the non-oxidizable fibrous material to the outer concrete surface these lengths of pipe in an alumina cement broth and effect the adherence of the alumina cement reinforced by this fibrous material to this outer concrete surface.

For a better understanding of the invention, it will now be explained in more detail with reference to a preferred embodiment shown in the drawing «

It shows

Pig. 1 a pipe made entirely of cement with a

outer layer made of reinforced by a non-oxidizable fibrous material. High alumina cement,

FIG. 2 is a side view of a device for producing the pipe construction shown in FIG.

Fig. 3 is a partial front view of the device of Fig. 2 to show the drive mechanism and

Fig. 4 is another partial front view of the device

009833/0542 BADORLGiNAL

after Pig · 2, which the circulating Eopf to the Applying the fibrous material to Sas Concrete pipe shows »

In Pig «1 a © r ZsieJammg, a Z eisest is made entirely Tube according to the present invention is generally denoted by 1.

Messs Soar includes © in as basic body di enemies Β © ϊ © εγ @ Μγ 2 $ w © lek @ s of the Sote durohetrömeadea material eis © isner © Bot © a © berflaoiie presents «. Me outer Otoerfl & © & © d gnasirohre © 2 forms- a® feiaJere SeMoht 3? t? ol © to.® Glass fibers T @ rsti, rkt @ ii high alumina cement

Dsa ijmer © © ter Bet @ ngrumSr @ Mr 2 ama Betoa example white on its basis v @ a det, and b @ i dex ¹ Heratellraag of the gsmg aue cement "existing drilling 1 the BstoBg ^ iaMrohr 2 is molded and © ine the Slaefibres ant3ä & lte © io! Eo & erdssementbrtihe is on the tied AusS @ nfMehe S © a B®tongff «adr © hree S amfgebraeirfe» -

Bie glass fibers can be used in the fora

apinstes can be applied, or alternatively a open fiberglass weaving mat can be used

The calcium aluminate cement containing the glass fibers binds to the Outer surface of the concrete base pipe 2 and connects with this.

The alumina cement used to form the outer layer 3 can have one of the following compositions}

SiO ₂ Al ₂ O ₃ CaO Fe ₂ O ₃ FeO TiOg MgO SO ₃

6.9 * 39.956 41.2 * 3.3 * 7 * 1.7 * 0.2 * trace 5.3 * 38.9 * 36.8 * 11.2 * 5.9 * 1.7 * 0.2 * trace

The thickness of the outer layer 3 can be any, for example

0 09833/0542 BAß

wise, si can be 1.6 to 6.3 am or even more, depending on the thickness of the glass fibers used The application of the outer chick * 3 is either caused by * that the (rias fibers before winding on the outer Layer the Seton base pipe 2 by an alumina cement brick leads) or by applying the high alumina cement broth this outer layer at the same time as the winding of the Glass fibers on the concrete base pipe 2

The concrete base pipe 2 is advantageous after setting of the concrete is moved along the length of a stationary dome and past a circumferential head »through which the Piberglas roving spun or the open fiberglass woven mat β (open weave fiberglass mat) wound onto the outer surface of the cement base pipe is · This is how the manufacturing process of the pipe made entirely of cement as an essentially continuous process

Figures 2 to 4- show a device for producing a pipe according to the invention * The concrete base pipe is supported by means of end plates 5 on a mandrel 4 and moved past a rotating head 6, which carries a number of separate reels 7 _v each of which is a fiberglass * Spun roving 8 is wrapped around the outer surface of the tube 2

Wrapping the fiberglass ^ roving 8 around the concrete * base tube 2 is supported by adjustable web guides 9

controlled ₉ which also serve to apply the alumina cement broth to the web «

Tanks 10 fttr of the alumina cement broth are on each side of the rotating head 6 and rings 11 for opening take the broth continuously pass through the respective Tanks 10 and convey the broth to the pin guides 9 » where the cement broth is applied to the fiberglass web 8

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when they move over the web guides 9 «

Figure 3 shows a conventional drive mechanism for the rotary drive of the rotating head © shown in Figures 2 and 4

The device shown in Figures 2 to 4 »in which the head 6 rotates and the tube 2 does not turn off · » leads, allows the process for the production of the pipe according to the invention as a continuous process by ·· feed · For the individual production of short pipe lengths, the pipe 2 is preferably rotated and the rings 11 for conveying the cement broth are then placed directly on the pipe 2 rotated and the alumina cement broth is transferred directly to the pipe, where the fiberglass sliver 8 is inserted into the Cement broth is wrapped "

It is preferably provided that glass fibers are used in the outer layer 3, but neither can others oxidizable fibers of suitable tensile strength are used, for example synthetic resin fibers such as nylon, Terylene or Polypropylene «

The all-cement pipe described above has greater strength than conventional simple ones Concrete pipes · The application of the outer layer 3 does not impair the strength of the concrete base pipe 2 and creates In addition, a protective cover surrounding it, which prevents deformation of the concrete base pipe 2 »

In addition, pipes according to the invention are inexpensive to manufacture and the increased strength is achieved without a substantial increase of the pipe weight. Furthermore, the use of non-Oxyäerbarem barrel material in the outer layer 3 sure that no spanking of the pipe strength can occur if the pipe is in contact with moisture and / or Air is used. - 6 -

^009833/0542

Claims (1)

The patient relaxes s 1, Pipe made entirely of cement with an inner bed surface, characterized by an outer one Layer (3) "which comprises alumina cement reinforced by a non-oxidizable fiber material (8)" ro 2ο pipe according to claim 1, characterized in, that the calcium aluminate cement is reinforced with glass fibers 3o pipe according to claim 1, characterized in that that the alumina cement is reinforced by synthetic resin fibers 4-ο Method of manufacturing a pipe made entirely of cement according to one of the preceding Claims, characterized by the following steps: forming separate lengths of a concrete pipe (2), after setting Advancing these pipe lengths along a central dome (4) on a rotating head (6) for wrapping the pipe with a non-oxidizable fibrous material (8), applying the non-oxidizable fibrous material to the outer concrete surface of these lengths of pipe in a slurry of alumina cement and causing it to adhere fibrous material reinforced alumina cements on this outer concrete surface 009833/0542