DE102006009640B4 - Supply line shielding element for thermal and electrical insulation of buried utility lines - Google Patents

Abstract

Supply line shielding element (1) for the thermal and electrical insulation of intersecting or close to each other buried supply lines, in particular gas and power lines, which is designed to form a positive connection with an adjacent shielding element (11) and in the laying position with the adjacent shielding element ( 11) forms a form-fitting locking device, characterized in that it has a spring-shaped extension (3) on one end region (8) for engaging in a groove-shaped recess (14) of the adjacent shielding element and a groove-shaped recess (4) on its other end region (2) ) for engaging a spring-shaped extension (13) arranged in the end region (18) of a further shielding element (11), that the one end region (8) has a projection (7) which runs essentially parallel to the surface normal of the shielding wall and the other end region (2 ) one with Vo rsprung of the adjacent shielding element (11) has corresponding recess (5) and that the projection (7) is formed on the spring-shaped extension (3) and has a different thickness compared to the spring-shaped extension (3), which with the projection of the further shielding element (11) corresponding recess (5) is formed on the groove-shaped recess (4).

Description

The invention relates to a supply line shielding element for the thermal and electrical insulation of intersecting or close-lying buried supply lines, in particular gas and power lines.

Technological background

The operational safety of gas pipelines and power cables installed in the ground requires minimum distances to be observed in the intersections and approximations of systems of different supply carriers in accordance with the relevant directives. This is to ensure that, for example, a ground fault of a power cable and an associated temperature development can not lead to damage or even explosion of the nearby running gas line. In particular, due to the large number of already laid in the public street space of the municipal utilities, the observance of such minimum distances is practically no longer possible.

State of the art

From the DE 70 05 191 U1 is a plastic cover for laid in the ground cable of the type mentioned above.

The cover is placed under bilateral support in the ground on the cable and has at one end at least approximately in the hood vertex an upstanding locking projection and at the other end also at least approximately in the hood vertex on a passage through which the locking projection of a next cover when plugging them is plugged , The Arretierungsvorsprung can be formed after the described in that document prior art as a round pin with a thickened end which can be snapped through the associated passage opening of the following cover hood. With the help of the passage opening and the locking projection, the successive covers can be interconnected by appropriate overlapping at the ends, so that a displacement of the covers in the longitudinal direction is avoided.

From the DE 94 04 719 U1 is a shielding element for the thermal and electrical insulation of buried supply lines known. This is typically made of a composite material with plastic and a pulp acting as an amplifier. It has a high thermal capacity and forms approximately in the case of a ground fault of the power cable as it were a protective shield, so that a running in the immediate vicinity gas line of a direct heat load is not exposed and damage is excluded. In addition, the material has a high insulation resistance, which in turn causes a favorable shielding of cathodically protected pipelines. These known shielding can be formed either plate-shaped or half-shell-shaped.

In accordance with the nature or extent of a region to be shielded around the intersecting or closely spaced supply lines, it is often necessary to arrange a plurality of the previously known shielding elements in an overlapping manner in order to achieve a required shielding over the entire area to be shielded. In particular, during or after the Einsanden or compaction of the soil, however, it may under certain circumstances come to an uncontrolled formation of gaps between the individual shielding in the shock or overlap region of the juxtaposed shielding.

Such a formation of gaps is particularly disadvantageous, because in the region of such gaps thermal and / or electrical insulation can no longer be effectively guaranteed, so that in principle there is a risk that it will damage the cable in a cable grounding and associated high heat development Gas line, such as a gas-PEHD tube comes. Such critical shifts individual shielding may also arise in the context of inspection work on the shielded supply lines or work in the immediate surrounding soil.

The EP 0 455 021 A2 discloses a pipe coupling according to the embodiment of 1 consists of an insulated tube, which is connectable by means of a simple socket connection with another tube. On the outside of an insulation is provided, each having a stop bead.

The AT 374 576 B discloses a segment for a can be connected from one another and relatively unwound segments existing insulating jacket for pipes, said inner and outer surfaces of the segment are formed as a rotational body with curved generatrix and in particular barrel-shaped.

The US Pat. No. 3,095,337 discloses a part-cylindrical insulating sleeve which can frictionally engage at its ends in an adjacent element.

The US 1 002 932 A also discloses frictional interlocking tubular sheaths.

From the DE 201 21 552 U1 is a pipe sleeve assembly of two sleeve half-shells known, the force and form-fitting a cable channel pipe or the like surrounds sealing.

The DE 94 04 719 U1 discloses a shielding element for thermal and electrical insulation.

problem

Based on this, the present invention seeks to improve a Versorgungsleitungsabschirmelement of the type mentioned in that a gap formation between adjacent abovementioned shielding is prevented. Furthermore, the invention has for its object to facilitate a simpler mounting or routing and a simpler fixing of successively arranged shielding elements.

Invention and advantageous effects

To achieve the object, a supply line shielding element according to claim 1 is provided.

The inventive form-locking connection of adjacent or successively arranged in laying shielding effectively prevents the above-mentioned columns may arise in the joint area of adjacent shielding. By the shielding elements are positively connected to one another in a Verstellstellung shielding the supply lines, even when Einsand or compaction of the soil or during revision work in the field of shielded supply lines ensures that the shielding remain arranged even under the influence of external forces in their laying position. In this respect, a secure fixation and easier installation of individual shielding elements for realizing a shield with variable length can be effectively achieved with the help of the shielding elements according to the invention.

It is provided that the shielding element forms a positive displacement safety in laying position with the respective adjacent shielding. As a result, a displacement or rotation of adjacent shielding elements is prevented transversely to the laying direction effectively. Overall, an effective composite of the individual components is achieved by the positive connection of the shielding on the one hand and by the displacement protection on the other hand, without, for example, in the case of a ground fault or other loads occurring to a gap.

The extension for forming the positive connection is formed spring-shaped, while the recess is formed as a spring corresponding groove. In principle, this tongue and groove arrangement can be designed as desired with regard to the geometry of the shielding elements to form the positive locking.

The anti-displacement or anti-rotation device is formed by one of the two end regions additionally having at least one protrusion extending substantially parallel to the surface normal of the shielding wall, while the other end region has at least one recess corresponding to the protrusion. The protrusion and the corresponding recess are cylindrical, for example, and typically have a profile or diameter that deviates significantly from the profile of the extension or engagement.

For example, if the recess and the extension are formed as interlocking profile elements, the positive connection is usually given only in one direction. With the aid of the additional projection and the corresponding recess, it is now possible to achieve a fixation of connected shielding elements with respect to both directions, that is to say both in the longitudinal and in the transverse direction of the shielding elements.

The projection is formed on the extension and has a different thickness compared to the extension. Accordingly, the projection corresponding to the recess is formed on the recess. The different geometry of the projection and of the projection, for example, a lateral displacement or rotation of the shielding elements in successively arranged and interconnected shielding effectively prevented. This allows a much safer fixation of individual shielding during installation and ensures that, for example, when compacting the soil after installation of the shielding they remain rigidly interconnected.

According to one embodiment of the invention, the shielding element can be positively connected to an end region in a partially overlapping laying position with a second shielding element. The positive connection is formed within the overlapping region of both shielding elements. Typically, the adjacent shielding elements overlap in their end region. This means that in their relocation adjacent shielding mostly overlapping and behind each other, ie pointing in substantially the same direction, positively connected and can be arranged.

According to the invention, the shielding element has at one of its end regions an extension for engagement in a depression of the respective, adjacent shielding element. The geometries or profiles of the extension and the recess are in this case matched to one another such that they are suitable for forming a positive connection between the two elements.

In principle, in particular when laying two shielding elements, it is sufficient that the one shielding element has only one extension and the other shielding element has a single corresponding depression. The facing away from each other in Verlegestellung end portions of the two shielding elements can be designed arbitrarily.

The shielding element has an extension at each end region and at its other end region an engagement or depression corresponding to the extension.

Thus, the shielding element can be connected in an advantageous manner with both its ends overlapping and form-fitting with adjacent shielding elements. As a result, in particular a modular structure of a shield consisting of several shielding or shielding is given. In this case, all interconnectable shielding can be made identical, which is particularly advantageous for a space-saving and effective storage.

Due to the fact that the shielding element is formed with both of its end regions to form a positive connection with adjacent shielding elements, in principle arbitrarily long shields of buried supply lines can be realized without any need for material processing such as trimming. In particular, by the production of shielding elements of different lengths, it is in principle possible to implement by an appropriate combination almost any arbitrarily long or short shielding entirely without material processing.

According to a further embodiment of the invention, the end region of the shielding element having the depression is set back relative to an inner wall of the shielding element in order to form a flush transition between adjacent shielding elements. This ensures that the voltage applied to the supply lines in the assembled state of the inner walls of the shielding in the transition region of adjacent shielding as continuously as possible without offset. That is, the inner wall of a shielding produced by a plurality of interconnected shielding elements lies as evenly as possible on the supply line to be shielded and in particular in the transition region of the shielding elements.

By such a uniform concern ensures that a pressure acting on the shielding by compaction of the soil pressure is transmitted evenly to the adjacent supply lines to a local or punctual loading of the shield, which sometimes leads to a gap formation between the shielding elements or even damage to the Supply line could lead to prevent.

The direction of the recess and of the extension at the opposite end regions of the shielding element is formed substantially parallel to the surface normal of the shielding wall of the shielding element. For example, if adjacent and interconnected shielding elements are arranged horizontally one behind the other, the extension and the recess are substantially vertically aligned. Located in the mounting position of the extension in the recess of an adjacent shielding, it is effectively achieved by the positive engagement thus formed that the adjacent and interconnected shielding in the horizontal plane are fixed relative to each other. An automatic release of the positive connection by a possible vertical movement of one of the shielding is prevented under normal circumstances by the resting of the shield on the supply line to be shielded.

According to a preferred embodiment of the invention, the projection and the corresponding recess are conical. This has the advantage that the joining of the shielding elements is facilitated during installation on the one hand. On the other hand, thereby an improved positive engagement is achieved.

According to a further embodiment of the invention, the extension and the recess are also conical, whereby the assembly of the shielding elements during installation is further simplified and the positive engagement formed thereby is further improved.

According to one embodiment of the invention, the shielding on the inside spacers for a spaced abutment of the shielding on the supply line. By means of this Spacer and the resulting cavity between the inner wall of the shielding and the supply line, an additional thermal insulation is achieved.

The spacers are preferably at least partially made of an elastic insulating material, such as sponge rubber, to ensure an adaptation to the geometry and the respective installation conditions of the supply lines and thus to prevent the risk of damage to the supply lines.

According to a further embodiment of the invention, the shielding element is plate-shaped. Such plate-shaped shielding are preferably for shielding supply lines with particularly large diameters advantageous because here the plate is independent of the respective nominal diameter of the supply line.

According to a further embodiment of the invention, the shielding element is formed substantially in the form of a half shell. This is particularly advantageous with smaller diameters of the supply lines, which are typically used in the area of house connections.

According to a further embodiment of the invention, in particular in the case of plate-shaped or half-shell-shaped shielding elements, the spacers are formed in the form of webs optionally glued to the shielding wall of the shielding element.

In particular, in the case of half-shell-shaped shielding elements, provision is made for the extension and, in a corresponding manner, also for the depression to be arranged around the half-shell-shaped shielding element. An overlapping arrangement in this context means that the extension or the engagement are aligned radially arranged around the curvature of the half-shell.

According to a further embodiment of the invention, the shielding element consists of a composite material with plastic and acting as an amplifier fiber material.

This material of the shielding element has a required high thermal capacity and forms in the case of a ground fault of a power cable as it were a protective shield, so that can effectively prevent a shielded gas line is exposed to direct heat stress, which could lead to damage. In addition, the shielding element of the invention provides electrical insulation, so that direct short-circuit currents between the power cable and metallic supply lines are largely avoided in a ground fault of the power cable. In addition, a high insulation resistance of the material used causes a favorable shielding of cathodically protected pipelines.

According to a further embodiment, it is provided that the plastic contains unsaturated polyester resins, in particular epoxy resins. The intrinsic properties of these unsaturated polyester resins, such as adhesion, chemical resistance, hydrolysis resistance and low thermal conductivity, are particularly advantageous in the case of the shielding element according to the invention.

To increase the strength and rigidity of the shielding element, it is further provided according to the invention that the plastic is reinforced with glass fibers as fiber material.

For fiber reinforcement, the glass fibers may according to a further embodiment of the invention in the form of formed by stitch formation, such as glass fabrics, glass knitted fabrics and knitted fabrics.

According to a further advantageous embodiment of the invention, the shielding element is made of a laminate with glass-fiber mats and unsaturated polyester resins, in particular epoxy resins as a binder. Such hard mats have an extremely high strength and can be produced in any size, so that the shielding elements according to the invention can be installed easily even at short distances in the crossing area or in approximations of underground power lines.

Furthermore, the material used of the shielding according to another embodiment of the invention may include a flame retardant to reduce the risk of fire at a ground fault of the power cable to a minimum.

According to a particular embodiment of the invention, a magnetic shield embedded in the composite material of the shielding element can be provided in order to prevent negative influence by the induction currents emanating from the power cable on metallic supply lines.

Further advantages and possible applications of the present invention will become apparent from the following description of an embodiment with reference to the drawings.

Show it:

1 an interior perspective view of a possible embodiment of a half-shell-shaped shielding element,

2 an external perspective view of 1 illustrated half-shell-shaped shielding element,

3 an internal perspective view of two form-fitting interconnected half-shell-shaped shielding and

4 one in the 3 shown elements corresponding perspective exterior view.

1 shows the perspective interior view of a shielding 1 which is in his in 1 rear end area 2 a depression 4 which is to receive one in the right end area 8th lying extension 3 is trained. You can see the inner wall, in the middle as well as at the right end 8th two spacers 6 . 9 for a spaced system of the shielding 1 has to be shielded on the supply line. The thereby inevitably formed, possibly filled with air cavity between the inner wall of the shielding 1 and the supply line to be shielded is particularly advantageous for the thermal insulation of the supply line.

The rear end area 2 that the depression 4 has, is withdrawn or reset relative to the inner wall. The offset caused by this reset corresponds approximately to the wall thickness of the shielding element 1 , so that in the formation of a positive connection, the inner walls of adjacent abutting shielding flush with each other, ie as flat as possible and without heels, adjacent to each other.

The form-fitting extension 3 and the corresponding recess 4 are substantially parallel to the surface normal of the wall of the shielding 1 formed so that the positive engagement is given in the plane of the shielding wall.

Furthermore, the recess has 4 a recess 5 on which to record a 2 shown projection 7 is suitable, the on the extension 3 at the upper end of an adjacent shielding element 1 is arranged.

The recess 5 and the depression 4 have as well as the corresponding projection 7 and the extension 3 different geometries, or different thicknesses, which effectively prevents each other in the assembled position positively connected shielding against each other are displaced or rotated. By means of the projection 7 and the recess 5 Thus, a mutual fixation of adjacent shielding 1 reached with respect to the directions defined by the wall.

2 shows an external perspective view of the in 1 Shielding element shown 1 , Here it can be clearly seen that the extension 3 a lead 7 having, for engaging in the recess 5 the depression 4 is trained. Compared to 1 is the shielding element 1 in 2 rotated, because of the. With respect to the inner wall retracted end 2 is herein as the rear end portion of the shielding 1 shown.

The in 2 represented projection 7 is as an integral part of the extension 3 shown. That means the lead 7 no further than the extension 3 from the wall of the shielding element 1 stands out, but that the lead 7 only a local, cylindrical or conical extension of the extension 3 represents. The lead 7 and the corresponding recess 5 can also reverse in the depression 4 or on the extension 3 be arranged. head Start 7 and recess 5 fulfill the purpose, the overlapping profile-like course of the extension 3 or the depression 4 to interrupt, thus a mutual rotation of connected shielding 1 in assembly position to prevent.

3 shows an interior perspective view of two mutually positively connected shielding 1 and 11 , The reference numerals of the additional shielding element 11 correspond to the same features of the shielding 1 , The reference signs of corresponding features differ by the number 10 ,

The positive connection, by the extension 13 the shielding element 11 and the depression 4 the shielding element 1 is formed, can be clearly seen. The spring-shaped extensions 3 . 13 as well as the groove-shaped depressions 4 . 14 have a slightly conical profile, as their side surfaces are slightly oblique. This conical profile has over an exactly perpendicular extension or vertically extending recess has the advantage that a simpler laying allows and a better positive engagement is effected.

Further, based 3 clearly seen that in the joint area between the two shielding elements 1 and 11 the inner wall is almost flush. This is achieved in that the shielding 1 . 11 in their end areas 2 . 12 have a larger radius and thus retreated respect. Its inner wall and therefore despite an overlapping arrangement of adjacent shielding 1 . 11 allow a nearly flat, continuous inside wall shielding. In this way it is ensured that the shielding 1 . 11 by means of their spacers 9 . 6 . 19 . 16 evenly spaced in plant to be shielded supply lines can be arranged.

In particular, characterized in that adjacent shielding 1 . 11 have an identical geometry, it is especially possible to realize a modular and thus flexible, easy and secure fixable shield of any length. In addition, the identical design of all shielding for a space-saving stacking and easy storage is suitable.

4 shows an external perspective view of the two in 3 illustrated form-fitting interconnected shielding 1 and 11 , The through the two shielding elements 1 and 11 formed arrangement is compared to the representation in 3 about a horizontally through the overlap region extending axis of rotation rotated by 180 °, so that the extension 3 together with the lead 7 the shielding element 1 now shown at the top of the picture.

LIST OF REFERENCE NUMBERS

1

shielding

2

end

3

extension

4

deepening

5

recess

6

spacer

7

head Start

8th

end

9

spacer

11

shielding

12

end

13

extension

14

deepening

15

recess

16

spacer

17

head Start

18

end

19

 spacer

Claims (18)

Supply line shielding element ( 1 ) for the thermal and electrical insulation of intersecting or close-lying buried supply lines, in particular of gas and power lines, for forming a positive connection with an adjacent shielding element (US Pat. 11 ) is formed and in laying with the respective adjacent shielding ( 11 ) forms a positive displacement safety device, characterized in that it has at its one end region ( 8th ) a spring-shaped extension ( 3 ) for engaging in a groove-shaped recess ( 14 ) of the adjacent shielding element and at its other end region ( 2 ) a groove-shaped depression ( 4 ) for engaging one in the end area ( 18 ) of a further shielding element ( 11 ) arranged spring-shaped extension ( 13 ), that the one end region ( 8th ) extending substantially parallel to the surface normal of the shielding wall projection ( 7 ) and the other end area ( 2 ) one with the projection of the adjacent shielding element ( 11 ) corresponding recess ( 5 ) and that the projection ( 7 ) on the spring-shaped extension ( 3 ) is formed and a compared to the spring-shaped extension ( 3 ) has different thickness, wherein the with the projection of the further shielding element ( 11 ) corresponding recess ( 5 ) at the groove-shaped depression ( 4 ) is trained. Supply line screening element according to claim 1, characterized in that it is provided with an end region ( 2 . 8th ) in a partially overlapping lay-up with the adjacent shielding element ( 11 ) is connectable. Supply line shielding element according to one of claims 1 or 2, characterized in that to form a flush transition between adjacent shielding elements ( 1 . 11 ) the depression ( 4 . 14 ) end region ( 2 . 12 ) with respect to an inner wall of the shielding element ( 1 . 11 ) is withdrawn. Versorgungsleitungsabschirmelement according to one or more of claims 1 to 3, characterized in that the groove-shaped depression ( 4 . 14 ) and the spring-shaped extension ( 3 . 13 ) substantially parallel to the surface normal of the shielding wall of the shielding element ( 1 . 11 ) are formed. Supply line screening element according to one of claims 1 to 4, characterized in that the projection ( 7 ) and the recess ( 5 . 15 ) are conical. Versorgungsleitungsabschirmelement according to one or more of claims 1 to 5, characterized in that the spring-shaped extension ( 3 . 13 ) and the groove-shaped depression ( 4 . 14 ) are conical. Supply line shielding element according to one or more of the preceding claims, characterized in that it has inside spacers ( 6 . 16 . 9 . 19 ) for a spaced system of the shielding ( 1 . 11 ) on the supply line. Supply line screening element according to claim 7, characterized in that the spacers ( 6 . 16 . 9 . 19 ) consist of an elastic insulating material, such as sponge rubber. Supply line screening element according to claim 7 or 8, characterized in that the spacers ( 6 . 16 . 9 . 19 ) in the form of, possibly to the shielding wall of the shielding ( 1 . 11 ) glued, webs are formed. Versorgungsleitungsabschirmelement according to one or more of the preceding claims, characterized in that it is plate-shaped. Versorgungsleitungsabschirmelement according to one or more of claims 1 to 9, characterized in that it is half-shell-shaped. Versorgungsleitungsabschirmelement according to claim 11, characterized in that the spring-shaped extension ( 3 . 13 ) and the groove-shaped depression ( 4 . 14 ) on the other side around the half-shell-shaped shielding element ( 1 . 11 ) are arranged. Versorgungsleitungsabschirmelement according to one or more of the preceding claims, characterized in that it consists of a composite material with plastic and acting as an amplifier fiber material. Supply line screening element according to claim 13, characterized in that the plastic contains unsaturated polyester resins, in particular epoxy resins. Supply line shielding element according to claim 13 or 14, characterized in that the fiber material contains glass fibers which are in the form of mesh-formed fabrics. Versorgungsleitungsabschirmelement according to one or more of claims 13 to 15, characterized in that it consists of a laminate with glass fiber mats and unsaturated polyester resins, in particular epoxy resins, as a binder. Versorgungsleitungsabschirmelement according to one or more of claims 13 to 16, characterized in that it contains a flame retardant. Versorgungsleitungsabschirmelement according to one or more of claims 13 to 17, characterized in that an embedded in the composite magnetic shield is provided.

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