Sewer pipe inspection and / or sewer pipe rehabilitation device with a push rod

Abstract

Sewer pipe inspection and / or sewer pipe rehabilitation device (100) with a push rod (10) and a sewer pipe inspection and / or sewer pipe rehabilitation unit (20) arranged at one end of the push rod (10), characterized by the fact that the sliding rod (10) is made of an elastomer (12) having a coating (14), wherein the coating (14) results in a coefficient of static friction µ in relation to pipes made of plastic, cast iron, concrete, stoneware or stainless steel H ) of 0.1 ≤ µ H < 0.4

Description

[0001] The invention relates to a sewer pipe inspection and / or sewer pipe rehabilitation device with a push rod and a sewer pipe inspection and / or sewer pipe rehabilitation unit arranged at one end of the push rod.

[0002] Such sewer pipe inspection and / or sewer pipe rehabilitation devices have been known for a long time, e.g., from DE 84 14 724 U1, DE 10 2016 109 844 A1, and DE 10 2009 017 829 B4. For advancing the sewer pipe inspection and / or rehabilitation unit, for example, a camera and / or a milling cutter, these devices have a push rod with suitable torsional stability and tensile strength. Furthermore, the rigid push rods preferably have a low specific weight and are, in particular, low-friction, abrasion-resistant, and chemically resistant.

[0003] At the same time, the push rod of such sewer pipe inspection and / or sewer pipe rehabilitation devices also acts as a protective cover for lines running in the push rod, e.g. electrical lines, optical lines or fluid lines for supplying a flushing fluid to the sewer pipe inspection and / or sewer pipe rehabilitation unit.

[0004] A polyamide hose or polyamide tube is often used as a push rod for sewer pipe cameras, as it is low in specific weight, abrasion-resistant, smooth-running and chemically resistant.

[0005] For house connection milling machines, however, polyamide hoses are not very suitable, as a polyamide hose accommodating all the lines necessary for the milling machine's operation would have to have a large diameter compared to push camera systems. This would make the push rod very rigid and difficult to bend. Furthermore, the unfavorable ratio of the polyamide hose's diameter to the required bending radius of the push rod increases the risk of kinking.

[0006] As an alternative to polyamide hoses, polyurethane hoses are used in sewer pipe rehabilitation devices with a milling machine, but these have lower abrasion resistance and higher friction compared to polyamide.

[0007] Other materials that influence the abrasion and sliding ability of push rods are synthetic fiber pipe liners installed in sewer pipes, such as those known from DE 102013 113 788 A1.

[0008] The object of the invention is therefore to create a sewer pipe inspection and / or sewer pipe rehabilitation device with a push rod that is also able to bend well even with larger diameters, such as those required for milling robots.

[0009] This problem is solved according to the invention by the sewer pipe inspection and / or sewer pipe rehabilitation device with the features of claim 1. The dependent claims describe advantageous embodiments of the invention.

[0010] The basic idea of ​​the invention is that a push rod is obtained from a material that is not very suitable for a sewer pipe inspection and / or sewer pipe rehabilitation device by coating it with a tribologically advantageous material, which meets the requirements with regard to abrasion resistance, low coefficient of friction with the pipe wall, high torsional stiffness, high torsional strength, flexural stiffness adapted to the respective application, low specific weight, chemical resistance and sufficient tensile strength.

[0011] The coating not only ensures a low coefficient of friction but also increases the bending and torsional stiffness of the sliding rod. The coating can be formed, for example, by wrapping the sliding rod with a film or by extrusion.

[0012] The coating thickness is chosen so that it will not wear away completely within the expected lifespan of the push rod. At the same time, care must be taken to ensure that no cracks form in the coating when the push rod is bent due to an excessively thick coating layer.

[0013] According to the invention, a sewer pipe inspection and / or sewer pipe rehabilitation device is provided with a push rod and a sewer pipe inspection and / or sewer pipe rehabilitation unit arranged at one end of the push rod, wherein the push rod is made of an elastomer having a coating, the coating having a coefficient of static friction µ resulting with respect to pipes made of plastic, cast iron, concrete, stoneware or stainless steel. H ) of 0.1 ≤ µ H < 0.4

[0014] The elastomer is particularly preferably an ethylene propylene diene monomer (EPDM) rubber. Most preferably, the elastomer comprises fibers embedded within it that increase the tensile strength of the sliding rod. These fibers can be, for example, aramid fibers or fibers made of an ultra-high molar polyethylene (UHMW-PE).

[0015] The outer coating of the sliding rod can, for example, consist of an ultra-high molar polyethylene (UHMW-PE).

[0016] Alternatively, the coating can also consist of PA11, PA12 or PA1010.

[0017] In another preferred embodiment, the push rod is designed as a hose. Alternatively, the outer coating can also be extruded onto the lines connected to the sewer pipe inspection and / or sewer pipe rehabilitation unit, so that the coated lines themselves constitute the push rod. In particular, an elastomer layer and then a sliding layer can also be extruded onto these lines.

[0018] However, if the push rod is designed as a hose, a coating covering the inner hose surface with a coefficient of static friction µ is particularly important. H ) of 0.1 ≤ µ H < 0.4 is specified in relation to pipes made of plastic, cast iron, concrete, stoneware or stainless steel.

[0019] The coating covering the inner hose surface is particularly preferred, made of PA11, PA12, or PA1010, or of an ultra-high molar mass polyethylene (UHMW-PE), so that lines communicating with the sewer pipe inspection and / or sewer pipe rehabilitation unit can be easily inserted into the hose over distances of 40 m or more. The inner line can be electrical, optical, or fluid-carrying, or a bundle of such lines.

[0020] To achieve a predetermined bending stiffness, a bending-stiff rod, preferably a fiberglass rod, can be provided, arranged in the lumen of the tube and passing through the tube.

[0021] The invention is particularly suitable for sewer pipe rehabilitation units equipped with a milling machine.

[0022] Tests have shown that sliding rods designed according to the invention have a coefficient of static friction between 0.1 and 0.4 with respect to the materials commonly used for sewer pipes, i.e. plastic, cast iron, cement or stainless steel.

[0023] PU hoses with a low-friction impregnation, on the other hand, have a comparatively higher coefficient of friction between 0.4 and 1.5.

[0024] Even a 0.4 mm thick UHMW-PE coating, as applied in the test, significantly increases bending and torsional stiffness. No measurable abrasion was detected in an abrasion test with 380,000 cycles. The same test on a PU hose resulted in a material loss of 0.9 mm after only 160,000 cycles.

[0025] The invention will be explained in more detail below with reference to a particularly preferred embodiment illustrated in the accompanying drawings. The drawings show: Fig. 1 a schematic side view of a sewer pipe inspection and / or sewer pipe rehabilitation device according to the invention; and Fig. 2 a cross-section through the push rod of the sewer pipe inspection and / or sewer pipe rehabilitation device Fig. 1.

[0026] Fig. Figure 1 shows a schematic side view of a sewer pipe inspection and / or sewer pipe rehabilitation device 100 with a push rod 10 and a sewer pipe inspection and / or sewer pipe rehabilitation unit 20 arranged at one end of the push rod 10. The sewer pipe inspection and / or sewer pipe rehabilitation unit 20 may include a camera and / or a milling cutter and / or a flushing nozzle, or be configured as such.

[0027] The push rod 10 is - like Fig.Figure 2 shows a schematic cross-section – designed as a hollow body and accommodating at least one conduit 30 inside. The conduit 30 can be an electrical conduit, an optical conduit, a fluid conduit, or a bundle of electrical and / or optical and / or fluid-carrying conduits, which is communicatively connected to the sewer pipe inspection and / or sewer pipe rehabilitation unit 20.

[0028] The sliding rod 10 is, in particular, a hose 12 formed from an elastomer with a coating 14 covering the outer surface of the hose made of ultra-high molar mass polyethylene (UHMW-PE). The elastomer is, for example, an ethylene propylene diene monomer rubber (EPDM) in which aramid fibers are embedded to improve the tensile strength of the hose 12.

[0029] The inner hose surface is also lined with a coating 16 made of ultra-high molar mass polyethylene (UHMW-PE), and, as shown, the outer surface of the line 30 inside the hose 12 also has a coating made of ultra-high molar mass polyethylene (UHMW-PE).

[0030] Line 30 may also contain a rigid fiberglass rod that provides additional flexural strength to the hose.

Claims

[1] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) with a push rod (10) and a sewer pipe inspection and / or sewer pipe rehabilitation unit (20) arranged at one end of the push rod (10), characterized by , that the sliding rod (10) is made of an elastomer (12) having a coating (14), wherein the coating (14) results in a coefficient of static friction µ in relation to pipes made of plastic, cast iron, concrete, stoneware or stainless steel H ) of 0.1 ≤ µ H < 0.4 [2] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) according to claim 1, characterized by , that the elastomer (12) is an ethylene propylene diene rubber (EPDM). [3] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) according to any one of the preceding claims, characterized by, that the elastomer (12) has fibers embedded in the elastomer (12) that increase the tensile strength of the push rod (10). [4] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) according to claim 3, characterized by that the fibers are aramid fibers or fibers made of ultra-high molar mass polyethylene (UHMW-PE). [5] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) according to any one of the preceding claims, characterized by , that the coating (14) consists of an ultra-high molar mass polyethylene (UHMW-PE). [6] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) according to any one of claims 1 to 4, characterized by , that the coating (14) consists of PA11, PA12 or PA1010. [7] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) according to any one of the preceding claims, characterized by , that the push rod (10) is designed as a hose. [8] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) according to claim 7, characterized by a coating (16) covering the inner hose surface with a coefficient of static friction (µ H ) of 0.1 < - µ H < 0.4 in relation to plastic pipes. [9] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) according to claim 8, characterized by , that the coating (16) covering the inner hose surface consists of PA11, PA12 or PA1010 or of an ultra-high molar mass polyethylene (UHMW-PE). [10] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) according to any one of claims 7 to 9, characterized by at least one line (30) connected to the sewer pipe inspection and / or sewer pipe rehabilitation unit (20) and received by the hose (12) with an outer surface coating made of ultra-high molar mass polyethylene (UHMW-PE). [11] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) according to any one of claims 7 to 10, characterized by a rigid rod arranged in the lumen of the tube (12) and passing through the tube (12). [12] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) according to claim 11, characterized by that the rigid rod is a fiberglass rod. [13] Sewer pipe inspection and / or sewer pipe rehabilitation device (100) according to any one of the preceding claims, characterized by , that the sewer pipe rehabilitation unit (20) is a milling machine.

Images