NO319539B1 - Fixed Point Hardware - Google Patents

Description

State of the art

For the distribution of flowing media, for example cold water or hot water, previously only metal pipes, particularly steel or copper, were available. Metal pipes are exposed to significant external and internal corrosion. In the interior of the pipe, a coating soon forms which gradually reduces the flow cross-section. In addition to this, metal pipes are heavy, labor-intensive to install and are overall cost-intensive.

The aforementioned disadvantages of metal pipes led to the development of plastic pipes and finally to composite pipes with an inner layer as well as an outer sheath of plastic. If plastics only transport cold media, for example cold water, the pipes are unlikely to be exposed to temperature fluctuations and no problems arise due to thermal length expansion. Hot water pipes, on the other hand, are mostly exposed to significant temperature fluctuations. The linear expansion coefficient for pure synthetic pipes and for composite pipes is several times greater than for steel pipes and therefore seems very disruptive. In the case of long pipe sections, clear loops occur due to the considerable thermal expansion. Such deformations have an adverse effect on the tightness of the fittings or fitting connections arranged in the pipe. Especially in the case of a bundle of pipes, a lack of stabilizing measures would create a very messy impression of the piping.

In order to prevent a risk of tightness and the piping giving a messy impression, anchoring of the pipe between fixed points is used. Fixed points are stable holding devices for the pipe in building parts, for example walls or roofs. A fixed point is designed to be significantly more massive and solid than just a pipe suspension because the fixed point has to absorb significant axial forces that arise from thermal expansion of the pipe.

In the figures IA to ID, as usual, to form a fixed point in a cable string, a fitting or a special fixed point sleeve is surrounded by a fixed clamp which is connected to a spacer and this is, on the other hand, fixed in a base plate which is anchored in the building part. Such embodiments are described, for example, in the company publications "JRG Sanipex® - Systembeschrieb", page 34f, issue 6.98: "JRG Sanipex® MT - Die Neuheit an der ISH '99 Frankfurt"; both from J.+R. Gunzenhauser AG, CH-4450 Sissach; "+GF+INSTAFLEX® - Technisches Handbuch", pages 10.14 to 10.17 by Georg Fischer Rohrleitungssysteme AG, CH-8201 Schaffhausen.

These previously known fixed point fittings do indeed produce the desired stabilization for the installed pipeline, but it is however a disadvantage that the fixed points can only be placed in places where there is already an accessible fitting within the cable string. If such a fitting is not located near a suitable building part, a separate fixed point sleeve must be fitted. This means additional material consumption and further assembly work, as well as two additional sealing points.

Purpose of the invention

Due to the aforementioned disadvantages, the purpose of the invention is to produce a fixed point fitting which can be installed in any position along the pipe outside a fitting or an additionally placed fixed point sleeve. The fixed point fitting must be suitable both for all-plastic materials and for composite pipes with an outer plastic jacket. With this fixed-point fitting, a stabilization effect must be achieved, as well as a dampening of the flow noise in the building, which is not inferior to the usual fixed-point fittings. Furthermore, the fixed point fitting must be able to be serially produced cost-effectively and it must be easy to assemble.

The field of application of the invention

The present invention relates to a fixed point fitting which is to form a fixed point on a line of pipes for flowing media and can be used, for example, in a supply network for hot water or home heating. The outer casing of the pipe consists of plastic and in particular it is a composite pipe.

GB 2 288 205 describes a pipe fitting by means of which a floating module for underwater oil and gas extraction is non-sliply attached to tubular risers. The outer sheath of the riser cable consists of plastic. The pipe fitting can be used within a defined size range for different wire diameters by means of an encircling elastic compression band, and remains securely fixed to the wire with shrinking and growing wire diameters, where the dimensional change occurs due to thermal expansion and alternating pressure conditions. The pipe fitting consists of at least two clamping elements arranged radially on a pipe, which have radial gaps between them. The width of the radial slots always adjusts according to the extensive wire diameter. By tightening the compression bands that surround the pipe fitting, the radial gaps are reduced. On the inside, the pipe fitting has a clamping zone formed by a thread contour. The pipe fitting's clamping zone bites into the outer plastic jacket of the riser when clamped. On the pipe fitting, a floating module in seawater attacks generated buoyancy forces in the axial direction of the riser. Above the pipe fitting, these buoyancy forces from the floating module are directed to the riser for support.

Overview of the invention

The fixed point fitting is used to form a fixed point on a pipeline for flowing media. At least the outer casing of the pipe consists of synthetic material, the pipe being particularly a composite pipe.

The fixed point fitting is an injection-moulded plastic part, and assembled from two half-shells which directly span the pipe, and which, when clamped together, penetrate into the outer jacket. The half-shells on one side are releasably or inseparably connected to each other by means of a hinge and on the other side are clamped together by means of clamping elements to a closed fixed point fitting. The clamping elements are formed by screws and complementary internal threaded holes. The screws have a seat in one half-shell and the internal threaded bores for engagement with the screw's threaded shaft are located in the other half-shell. The internal diameter of the joined half-shells is smaller than the external diameter of the pipe. The clamping zone is advantageously designed for absorption of axial forces that arise due to thermal expansion.

The features below are aimed at details of special embodiments of the fixed point fitting. The clamping zone has a profiling of fully or partially circumferential raised ribs with a sawtooth-shaped cross-section. In addition, the fixed point fitting has an axially limited space for a normal pipe holder which can be provided with a sound-absorbing insert and a sleeve piece for connection with a spacer bar. The distance rod is attached to a base plate which is fixed to a building part. The space for the pipe holder is formed by a radially circumferential groove or band found in the shell part.

The raised ribs are arranged on the cross-sectional plane of the tension elements for the shell parts. To absorb the alternating axial tensile and compressive forces, it is an advantage that the raised ribs with sawtooth-shaped cross-sections have an extension that alternates in the axial direction.

The hinge that connects the two half-shells to each other is, for example, a film hinge. Alternatively, the hinge can consist of a pin bearing and a pin which is inserted into this and which at the same time forms the hinge pin. Finally, the hinge can be of traditional construction with a separate connecting pin as axis. The screws stick through through-holes which have a constriction to prevent the screws from falling out.

Brief description of the drawings

Here shows:

Execution example

With reference to the attached drawings, a detailed description of a preferred embodiment of the fixed point fitting according to the invention takes place in the following. Finally, possible modifications are discussed.

For the complete further description, the following provision applies. If, for reasons of clarity of the drawings, reference numbers are used which are not mentioned in the immediately associated description text, reference is made to the description of these in the preceding or subsequent description of the figures. For reasons of clarity, the repeated description of components in the additional figures is mostly avoided if it is not unambiguously clear from the drawing that it is about "repetitive components".

Figures 2A to 2D

The fixed point fitting 2 is intended for a pipe 1 which either consists entirely of plastic or is a composite pipe which is externally coated with plastic. In all cases, the outer casing 10 of the pipe 1 must consist of plastic. In the standard version, the fixed point fitting 2 has a shell-shaped semi-circular upper part 20 and a semi-circular lower part 21 which is shell-shaped and complements the upper part where the parts are connected to each other by means of a hinge 22 and can be clamped against the pipe 1 by means of clamping elements 23,24. In the simplest version, the clamping elements 23,24 are formed by screws 23 and complementary

internal thread 24, the heads 230 of the screws 23 being supported on the free ends

flange noses 200 on the upper part 20 and the threaded shafts 231 of the screws 23 protrude through the flange noses 200 in the direction of the flange noses 210 on the lower part 21 where the internal threads 24 are arranged. The hinge 22 makes it possible to open the upper and lower parts 20,21, and makes it possible to place the open fixed point fitting 2 on the pipe 1. In the screwed state, the fixed point fitting 2 encloses the pipe 1 radially firmly.

The upper and lower parts 20, 21 have on the outer flanks two radially encircling, raised and parallel legs 201,202; 211,212 between which there is a recessed reshaped groove 203, 213. The individual legs 201,202; 211, 212, as well as the grooves 203,213 on the upper and lower parts 20,21 fit together in a complete circle. At the first ends of the legs 201, 202; 211,212 there are hinge elements 220, 221 which are complementary to each other and engage each other while at the other ends of the legs 201, 202; 211,212 there are two flange noses 200 on the upper part 20 and two complementary flange noses 210 on the lower part. In each of the flange noses 200 on the upper part 20, there is a through bore 204 for the passage of the threaded shafts 231 on the screws 23. In each of the flange noses 210 on the lower part 21, there is an internal thread 24 which engages with the threaded shafts 231 on the screws 23.

Inside the upper and lower parts 20, 21, a clamping zone 205, 215 is arranged which preferably has a profile. It is advantageous for the profiling to consist of radial fully or partially circumferential raised ribs with a sawtooth-shaped cross-section. It is particularly advantageous if one arranges the profiling 205, 215 only under the legs 201, 202; 211,212 since by clamping the fixed point fitting 2, it is achieved that the clamping zones 205,215 with the profiling engage more deeply in the outer plastic jacket 10 on the pipe 1. It would also be advantageous to design the sawtooth-shaped profiling aligned axially diametrically. That is, the tooth tips on the grooves under the interlocking legs 201,211 resp. 202, 212 are aligned alternately as groups or all the tooth tips are alternately aligned. In the event of pressure or tension in the tube 1, the serrated profiling that penetrates the outer casing 10 thus conforms to the pressure or tension movement.

Figures 3A to 3E

In this series of figures, the upper part 20 is shown in a synthetically optimized design. The rib structure 206 on the upper side of the leg 201, 202 enables faster and more thorough cooling of the injection molded part in the mold and thus faster production times. In addition to this, a reduced material consumption is also achieved. The through bores 204 for the screws 23 have at their outlet a narrowing 207 whereby the inserted screws 23 are secured against being lost. The hinge element 220 on the upper part 20 has an upper, open longitudinal part which is to be hooked into the complementary bearing element 221 on the lower part 21.

Figures 4A to 4E

In this series of figures, the lower part 21 is likewise of a design which is synthetically optimized with the rib structure 216 on the upper side of the leg 211,212, which offers the previously mentioned advantages.

The internal threaded bore 24 for engagement with the screws 23 has a funnel shape 240 at its inlet, so that during installation the tip of the screws 23 is guided into the internally threaded bore 24. The hinge element 221 on the lower part 21 in the form of a bearing part can be hooked from above into tabs in the upper part 20 of the hinge part 220.

Figures 5A to 5D

This series of figures shows the fixed point fitting 2 which is assembled from upper and lower parts 20, 21 in the closed state seen in different directions. The hinge elements 220,221 engage each other and the flange noses 200,210 on the legs 201, 202; 211,212 of the upper and lower parts 20,21 come into contact with each other, so that the screws 23 can be screwed into the internal thread 24 through the bores 204. Hinge 220 which is formed by the hinge elements 220,221 makes it possible to swing up the fixed point fitting 2 about the hinge axis, in the hinge 220, however, the upper and lower parts 20, 21 are held together against tension.

Figures 6A to 7

In the grooves 203,213 which lie between the legs 201,202; 211, 212 and merge into each other, a normal pipe holder 3 is inserted with a sleeve piece 30 for attaching a spacer rod 4. The spacer rod 4 extends to a base plate 5 which is attached to a suitable building part. It is common for a sound-absorbing insert 6 to be arranged under the pipe holder 3, which in the fixed point fitting 2 according to the invention will lie in the grooves 203,213.

Possible constructive modifications of the fixed point fitting must be mentioned:

Instead of an upper part 20 and a lower part 21, the fixed point fitting 2 could also

consist of several parts that together form a shell.

An advantageous embodiment lies in the fact that the fixed point fitting 2 is designed quasi-partly, but

foldable and that the opening is made possible with a film hinge.

Instead of a fixed point fitting 2 consisting of legs 201,202; 211,212 and the intermediate grooves 203,213, it will also be possible to make the fixed point fitting 2 of two separate rings with the inner clamping zones 205,215 which are placed in place on the pipe 1 at a distance from each other and in the distance between them the pipe holder 3 is then inserted with the possibly inserted soundproofing layer 6.

In conclusion, one could put on just such a ring with the internal clamping zone 205, 215 on the pipe 1 and the pipe holder 3, possibly with the embedded noise protection layer 6 in place and hold the ring motionless axially. For axial fixation of the pipe holder 3, a band found on the shell parts 20, 21 could also be used.

Claims (7)

1. Fixed point fitting (2) for forming a fixed point on a pipeline (1) for flowing media, where: a) the outer jacket (10) of the pipe (1) consists of plastic, and the pipe (1) in particular is a composite pipe, b) the fixed point fitting (2) is an injection-molded plastic part and assembled from two half-shells (20, 21) which directly span the pipe (1), and which, when clamped together, penetrate into the outer jacket (10), c) the half-shells (20,21) on one side is releasably or inextricably connected to each other by means of a hinge (22; 220, 221) and on the other side is clamped together by means of clamping elements (23, 24) to a closed fixed point fitting (2), d) the clamping elements (23,24) are formed by screws (23) and complementary internal threaded bores (24), e) the screws have a seat in a half-shell (20) and the internal threaded bores (24) for engagement with the threaded shaft (231) of the screw (23) are located in the other half-shell (21), characterized in that f) the internal diameter of the joined half-shells (20,21) is smaller than the external diameter of the tube (1), and g) the clamping zone (205,215) is intended for absorption of axial forces arising due to thermal expansion. 2. Fixed point fitting (2) as specified in claim 1, characterized in that the clamping zone (205,215) exhibits a profiling of fully or partially circumferential raised ribs with a sawtooth cross-section. 3. Fixed point fitting (2) as specified in claim 1 or 2, characterized in that a) it has an external axially limited recess (203, 213) for a regular pipe holder (3) which, together with a noise-protective insert (6) and a sleeve piece (30) ) can be connected with a distance rod (4) and b) the distance rod (4) is attached to a base plate (5) which is fixed on a building part. 4. Fixed point fitting (1) as specified in claim 3, characterized in that the recess for the pipe holder (3) is formed by a) a radially circumferential groove (203,213), or b) a band found on the shell part (20,21). 5. Fixed point fitting (2) as stated in claim 2, characterized in that a) the raised ribs are arranged on the cross-sectional plane of the tension elements (23, 24) for the shell parts; b) and the raised ribs with a saw-edge shaped cross-section can be oriented axially in alternating directions. 6. Fixed point fitting as specified in claim 1, characterized in that the hinge (22): a) is a film hinge that connects both half-shells (20, 21) to each other or b) consists of a pin plate (220) and a pin (221) that can be inserted in the pin plate and at the same time forms the hinge axis, or c) has a separate connecting pin as axis. 7. Fixed point fitting (2) as stated in claim 1, characterized in that the screws (23) protrude through through-holes (204) which, to secure the screws (23) against falling out, have a constriction (207).