WO2018004349A1

WO2018004349A1 - Devices and method for connecting pipes, and application thereof

Info

Publication number: WO2018004349A1
Application number: PCT/NO2016/050148
Authority: WO
Inventors: Rune LANGHELLE
Original assignee: Odin Connect As
Priority date: 2016-06-30
Filing date: 2016-06-30
Publication date: 2018-01-04

Abstract

A clamping body for the fastening of a pipe end is described, where the clamping body can be reset from a fitting position at the circumference surface of the pipe end to a fastening grip into the pipe surface, and the clamping body is characterised by a combined unit of a support ring (52) to be threaded onto a pipe end and a number of angled clamping bodies (50) to be pushed in between the underside of the support ring (52) and the pipe surface, and the underside of the clamping body (50) is comprised of a first surface (57) set up to lie against the pipe surface during the fitting of the clamping body and a second surface (58) which, in a resetting of the clamping body, is set up to form an engagement with the pipe surface for said fastening grip. Also described is a method, a construction and an application of the clamping body.

Description

DEVICES AND METHOD FOR CONNECTING PIPES,

AND APPLICATION THEREOF. The present invention relates to a clamping body for the fastening to a pipe end, where the clamping body is reset from a fitting position at the circumference surface of the pipe end to a using position where the clamping body forms a fastening engagement to the surface of the pipe by axially directed tightening of a tightening means against the rear side of the clamping body, as can be seen in the introduction of claim 1 .

The invention has particular relevance to a clamping body that is fastened to a pipe end, said pipe end is intended to be connected with an adjoining pipe end, a blinding plug, a flange or an entrance to a valve unit, by axially directed tightening of the tightening body against the rear side of the clamping body during the connecting operation. A blinding plug is intended to block the pipe end and can be comprised of a plate form which said pipe end shall be pressed against with the help of the invention, while a flange or T-connection normally comprises a pipe stub with approximately the same diameter as the pipe end.

The present invention also relates to a method and a construction for the connecting of two pipes, end-to-end, or the connecting of a pipe end to another flange/valve/ blinding plug (sealing), where the clamping body at each pipe end is reset from a fitting position to a using position where the clamping body forms a fastening engagement in the surface of respective pipes - near the pipe end - by axially directed tightening of tightening bodies against the rear side of the clamping bodies, as can be seen in the introductions of claims 9 and 1 5, respectively.

Consequently, the invention is mainly for the connection of pipes, i.e. two pipes that are placed end-to-end, or when required for another connection/flange and this without there being a need to weld or glue them together. In particular, it relates to coupling of metal pipes/flanges, but it can also be used on pipes of all kinds of materials, such as plastic pipes. Furthermore, a preferred application of the above mentioned clamping body is described. When two pipes shall be connected together in that adjoining pipe ends are set against each other end-to-end, it must be in such a way that there are no leaks in the joint, such as liquid or gas which a pipeline will later carry does not leak out through the joint.

Today, there are so called cold weld-free solutions known for the connecting of pipes, without the use of heat (welding/soldering), and as a rule a flange is used. The methods that dominate the market are based on the pipes being processed and pre- treated to fasten the pipes together with the help of a flange, i.e. one flange on each pipe end, and the pipe ends are then placed against each other with a gasket placed in between. A number of axially directed threaded bolts that are guided through two ring-formed flanges that are arranged on either side of the connection, and by tightening of the nuts on the bolts, the pipe ends are screwed towards each other so that the gasket completely closes the existing gap between the pipes and provides a good seal. However, this leads to a need to use complex machinery, often large and heavy machines, for the connection to keep its position on the pipes.

It is an object of the invention to be able to couple together pipes and pipes/ flanges/ valves without the need for any pre-treatment of the pipe surfaces.

Prior art.

Several of such joints are already known, where one uses seals of an elastic material such as plastic or rubber that are squeezed together around the joint between the pipes with the help of conical pipe casings that are screwed together.

Of the previously known devices, reference is made to the British patent GB-502.386 and the Chinese Utility Model patent CN-2303989.

Said British patent GB-502.386 describes a construction to seal the gap between two pipe sections that are placed against each other, end-to-end, to be used to carry a fluid, gas/liquid through the pipes.

A short casing is threaded over so that it covers and surrounds the gap between the pipe ends, whereupon a casing previously threaded onto each respective pipe end is now brought forward to lie adjoining each end of the casing that covers the joint. When two ring-formed flanges 4 that comprise correspondingly formed conical insides are screwed towards each other and together, the flange cone will force the gaskets together so that they are deformed and generate a grip against the pipe surface at their ends which thereby is held tightly together.

The Chinese Utility Model patent CN-2303989 suggests joining together the pipe ends with the help of radially running screw bolts 7 and 3, respectively, and two facing ring flanges 6 and 3, which are guided towards each other and over a loose casing 8 that is placed enveloping the pipe ends. The flanges are screwed together with axially running bolts 1 and the pipe ends are held together against each other with help from the radial screw bolts through the flanges.

Also known is a series of variants of such basic principles as wedge formed gaskets and casings to generate sealing couplings.

Common for these known solutions is that the casing-formed gasket element that lies innermost covers the gap between the pipes and that there is no separate gasket between the pipe ends that shall lie end-to-end. Furthermore, each end of the gasket casing is cut at an angle to be squeezed together between correspondingly angled cut elements (ring-formed flanges) that are threaded in, in advance, onto the pipes and that are now guided back in over the gasket casing and squeeze this together by the tightening of, for example, axially running bolts.

The disadvantages of these known solutions are consequently that there is either a need for machines for the pre-treatment of the pipes, or that they cannot get a sufficiently good grip on the pipe to handle demanding tasks (vibrations/ pressure).

Of other known solutions, the following patents shall be mentioned:

-US-2006012172 where a fastening on each pipe end must be screwed down with several bolts, thereafter the pipes are screwed together with bolts. The connecting unit is comprised of a number of elements flipped from a first position to a second position, in said second position a gripping edge engages with the outer surface of the pipe.

-EP-0859088 shows a solution where four spikes are forced into a pipe inside a hollow space, no lever/ dolly.

-US-2006244260 where many spikes are screwed into the pipe surface.

-DE-32 24 25 where the clamping body is rotated into the surface. -JP-10153286 where a spike is rotated into a pipe.

-US-2010090460 where a spike is forced into a pipe in that two plates are forced against each other.

-GB-191319666 where a gripping thread is forced into the pipe.

Further references are given to US 2012274063, GB-596.397, FR 1 188921 and EP-0191660, as:

-US-2012/274063 D2 shows a pipe connection where a number of cam-formed segments are flipped so that they engage with the pipe surface with the help of gripping surfaces.

-GB-596.397 shows a pipe connection where a segmented ring is made to engage with a pipe surface by tightening two flanges axially towards each other.

-FR-1 .188.921 shows a flange connection where the two flanges lie against a bead in the pipe, and where the two flanges are placed some distance away from their respective pipe ends so that the pipe ends are brought into direct contact with each other when the connection is tightened.

-EP-0191660 describes a flange connection where the flanges constitute a number of segments rotary fastened to the outer diameter of the connection.

None of these use a moment arm or lever principle in the same way as the present invention does and none use a ring as a support body to ensure a dolly effect to achieve momentum to force the clamping elements into the pipe surfaces.

Objects of the invention.

It is an object of the invention to provide a new construction for the fastening to a pipe end and which shall be used to couple together two pipes, end-to-end, or pipe and flange / valve without there being a need to weld, arrange collars or treat the pipe in advance. It shall also work with different pipe sizes (diameters and wall thicknesses) and at several different pressures in the fluids (gas - liquids) that the connected pipes are intended to carry.

One objects with the present invention to provide a solution where each pipe end comprises its own connecting body and which does not cover the gap between the pipe ends when these are joined together, end-to-end. Furthermore, it is an object of the invention, to provide a construction where each clamping body is only for the joining together of the pipe ends, while a ring gasket carries out the sealing function between the pipe ends. Furthermore, it is an object of the invention, in that the body that provides the sealing between the pipe ends with a plane end surface, is a flexible gasket ring or other gasket with its circumference dimensions adjusted to the diameter and wall thickness of the pipe.

The present invention.

The clamping body according to the invention is characterised by

- a combined unit of a support ring to thread in over a pipe end and a number of angled clamping bodies to be guided in between the underside of the support ring and the pipe surface, and

the underside of the clamping body comprises a first surface set up to bear against the pipe surface during the fitting of the clamping body and a second surface which, at a resetting of the clamping body, is set up to engage with the pipe surface for said fastening grip.

According to a preferred embodiment, the first and second surfaces are mutually angled, as the second surface is comprised of a number of sharp-edged ridges, cams or spikes set up to grip into the pipe surface.

According to a yet another preferred embodiment, the clamping body is set up to be pushed in under the support ring with the first surface without the sharp-edged spikes facing the pipe surface, and in a rotation of the clamping body by a tightening process, the second surface is flipped over with its sharp-edged ridges, cams or spikes so that these penetrate into the pipe surface.

According to yet another preferred embodiment, the support ring is placed radially immediately under a flange which, during the connecting process, is displaced axially to set up said fastening engagement.

According to yet another preferred embodiment, the underside of the clamping body is comprised of a rounded seat for positioning against the support ring.

According to yet another preferred embodiment, the clamping body has a mainly L- shaped cross section with a short leg and a long leg, as a transition in the underside between the leg parts forms a rounded seat for the support ring. It is preferred that the underside of the first and second surface parts of the clamping body are gently arched in the direction of the circumference when fitted with an arch shape corresponding to the pipe surface they shall bear against, or the clamping body defines a rounded transition between said surface parts so that the rotation can take place without too much resistance.

Particularly preferred is that the number of flippable clamping bodies is equal to the number of axial clamping bolts, as each clamping body is placed squeezed in between two adjacent bolts or two or more clamping bodies are squeezed in between two adjacent bolts.

The method according to the invention is characterised in that

- a support ring is threaded in over each pipe end, a distance inside the pipe end

- a number of angled clamping bodies are guided in from the pipe end

between

the underside of each support ring and the pipe surface, as the clamping bodies are arranged mutually spaced apart around the circumference of the pipe end so that the support ring is positioned in each underside of the clamping body, and

- by axial tightening of the tightening bodies, the clamping bodies are pivoted such that a surface part in the underside of each clamping body is forced into a fastening grip against the pipe surface.

According to a preferred embodiment, each clamping body/connection piece is clamped in under the support ring which thereby holds the whole assembly in place at the pipe end.

According to a preferred embodiment, an angled clamping body with an arch shape or L-form is used and defines a seat in its underside for the positioning of the support ring.

According to yet another preferred embodiment, the underside of the applied clamping body defines two mutually angled bottom surfaces, a first bottom surface which is even and smooth and which, during the pushing in under the support ring, glides against the pipe surface and an adjoining second bottom surface which is comprised of a number of cams or spikes, and in a rotation of the clamping body the cams/spikes penetrate into the pipe surface to provide for the fastening grip. It is preferred that each support ring is placed on a pipe end radially, immediately under a respective flange and they are squeezed in by the clamping bodies, flanges and bolt heads to form a stable assembly.

Furthermore, it is preferred to use a tightening casing with an inwardly facing flange and internal threads, and, in a screwing together with a corresponding opposite casing with inwardly facing flange and external threads, flip over the clamping bodies on each pipe end to form an engagement with the pipe surface as a consequence that the flanges lie against the rear side of the clamping bodies and lead to these being flipped downwards into a fastening grip.

When such a pipe end shall be squeezed against a blocking plate, for example, in a blinding plug, via an intermediate gasket ring (1 1 ), the blinding plug can be comprised of external threads adjusted to the internal threads in the casing that is used for the connection operation.

The construction according to the invention is characterised by

- a combined unit of a support ring to be threaded in over a pipe end and a number of angled clamping bodies to be guided in between the underside of each support ring and the pipe surface, and

the underside of each clamping body comprises a first surface set up to lie against the pipe surface during the fitting of the clamping body and a second surface set up to make an engagement with the pipe surface for said fastening grip.

The first and second surfaces are preferably mutually angled, as the second surface is comprised of a number of sharp-edged ridges, cams or spikes set up to grip into the pipe surface. It is particularly preferred that the clamping body is set up to be pushed in under the support ring with the first surface without the sharp-edged spikes facing the pipe surface, and in a pivoting by the tightening of the clamping body, the second surface with the sharp-edged ridges, cams or spikes is flipped over so that these penetrate into the pipe surface.

According to yet another preferred embodiment, the support ring, at each end, is placed radially immediately under respective flanges and is squeezed in by/between clamping bodies, flange(s) and bolt heads, something which means that one has a stable assembly.

The underside of the clamping body preferably is comprised of a rounded seat for the positioning against the support ring.

Furthermore, each clamping body has a mainly L-formed cross section with one short leg and one long leg, as the transition in the underside between the leg parts forms a rounded seat for the support ring. Furthermore, the underside of the clamping body of the first and second surface parts, respectively, is gently arched (in the direction of the circumference when fitted) with an arch shape corresponding to the pipe surface it shall lie against, or the clamping body defines a rounded transition between said surface parts so that the rotation can occur without too much resistance. Furthermore, the number of flippable clamping bodies is equal to the number of axial clamping bolts, as each clamping body is placed squeezed in between two adjacent bolts.

Application of a clamping body according to the invention for the connection of a pipe end to an adjoining pipe end comprising a pipe stub in connection with a blinding plug, a flange or entrance to a valve unit, as the blinding plug can be comprised of a plate form against which said pipe end shall be forced, while a flange or T- connection comprises a pipe stub of an approximately same diameter as the pipe.

Figures to describe the invention.

The invention shall now be described in more detail in the following with reference to the enclosed figures, in which:

Figure 1 shows a longitudinally running section of two pipes, 10,20 that shall be coupled together by means of the inventive construction, where the connecting unit is in its initial position before it is brought to make an engagement into the pipe surface and thereby fasten them to the pipe.

Figure 2 shows a cross section of the construction. Figure 3 shows an enlarged section from figure 1 , and shows it in its initial position. Figure 4 shows the situation where the connecting units on the two adjoining pipes are guided towards each other and thereby brought into engagement with the pipe surface and fasten them to the pipe. Figure 5 shows an enlarged section from figure 4. Each part in the connecting unit is now flipped over and the spike(s) are forced into the pipe surface.

Figures 6a, 6b and 6c show different perspectives of an alternative and preferred L-formed clamping body which is used in accordance with the invention, and show in particular the two surfaces which in turn shall lie against the pipe surface. The figures also indicate the placing of the holding ring 52.

Detailed description of preferred embodiments of the invention.

The figures show two pipes to be interconnected together and details of the construction of the clamping bodies that are used for this purpose. Reference is given to the figures 1 -6.

According to a first aspect, the invention relates to a clamping body for the fastening to a pipe end that shall be connected further to an adjoining pipe end, a blinding plug, a flange or a valve unit.

Figure 1 shows a longitudinally running section of two pipes 10 and 20 that are placed end-to-end with an intermediate gasket 1 1 that shall seal against leaks. A locking unit of a number of clamping bodies 50 according to the invention is placed onto respective pipe ends around the pipe circumference, as each clamping body 50 is supported/held in place and is carried by a support ring 52. A ring-formed flange 30,31 is placed on the rear side of each of them and comprises borings for the insertion of longitudinally running threaded bolts 34 with bolt head 35 and associated nuts 40 and washers 41 , to screw and tighten the clamping bodies 50 so that they each flip over and form a fastening grip with the pipe surface. Instead of the construction where the locking units are screwed together and are activated by flanges that are brought together by screwing in of a number of axial bolts 34, one can use threaded casings that are comprised of inwardly facing flanges and which are screwed together over the end pieces and thereby provide force to the levers and flip the clamping bodies over to make an engagement with the pipe surface as a consequence of the flanges lying against the rear side of the clamping bodies and resulting in these being flipped downwards. According to an example, such a casing is used when a pipe end with the inventive clamping body shall be fastened in towards a blinding plug which is comprised of a protruding short end part of the same diameter as the pipe end that shall be joined together end-to-end. Such blinding plugs end parts can be comprised of an outer threaded part onto which the casing can be screwed in, as the casing is, in advance, threaded onto the pipe before the clamping body is fitted, to be guided forwards so that the inwardly facing pipe flange lies against the rear side of a ring-formed flange or directly against the rear side of the clamping body around the circumference. This technique can also be used when a pipe end shall be joined together with a pipeline system via a T-connection stub that is placed with its end towards the pipe end.

In the following, the connecting together of two pipe ends shall be described, where the locking unit is comprised of a number of clamping bodies 50 that are supported by the support ring 52 as such a unit 50/52 is threaded onto each pipe end. In particular, reference is given to figure 6a that shows a clamping body 50 seen at an angle from below.

Each clamping body 50 has a mainly L-formed cross section, see figures 3, 5, and 6, with one short leg 54 and a long leg 56 (or has a cleaner hook form as figure 6 shows). The transition between these two leg parts 54,56, i.e. in the underside, is formed with a rounded seat 53 for the support ring 52. The underside is defined by two surface parts, the first 57 and second surface part 58, respectively, that are angled with respect to each other and furthermore they are gently arched (in the direction of the circumference when fitted) corresponding to the pipe surface 20 they shall lie against. Instead of a marked clean angle between the surfaces 57,58 of the clamping body, they can be a rounded transition as the figure shows that the assembly can happen without too much resistance. When a clamping body is fitted, it will be standing straight up from the pipe surface, as the short leg lies in parallel with the pipe axis, while the second (long) leg extends radially outwards

approximately perpendicular to the pipe surface adjoining the pipe end. Then, the underside 57 of the short leg lies against the pipe surface.

The one first surface 57 is the surface with which the connecting piece 50 initially lies against the pipe surface with, during the insertion under the support ring 52. The second surface 58 is the surface with which the clamping body is reset to be forced against the pipe surface with. This surface 58 comprises a downwardly directed spike 59 or a set of spikes, pointed sharp-edged ridges, or cams (or a rough surface) and which, in the flipping of the body 50, shall be forced into the pipe surface. The flipping takes place in that the bending part 56 is subjected to a force with the direction shown by the arrow P as shown in figure 6a.

This construction of the support ring 52 and a number of connecting pieces 50 can be fitted onto a pipe end as follows: A support ring 52 is threaded onto the pipe 10 and a number of connecting pieces 50 are inserted under the ring 52 and the pipe surface, as the thickness of the leg 54 of the connecting piece 50 is adjusted to the distance between the inside of the ring and the pipe surface. Ring-formed flanges or ferrules 30 and 31 , respectively, one on either side, are threaded onto the top part 32a and 34a, respectively, resting against the outside of (figures 3 and 5) and the flipping starts when these ferrules 30,31 are moved towards each other with the through-running threaded bolts 34 that screw together the ferrules. The ferrules and how they are assembled are well known technology.

The number of clamping bodies can be the same as, or different to, the number of clamping bolts, as according to a preferred embodiment each clamping body is placed squeezed in between two adjacent bolts. Alternatively, two or more clamping bodies 50 can be fitted to the support ring 30 between two adjacent axial tightening bodies in the form of bolts 34.

The example in the figures shows that ten connecting pieces are placed around the pipe circumference and ten clamping bodies, where each clamping body/connecting piece 50 is squeezed in under the support ring 52 which thereby holds the whole assembly in place at the pipe end. The two clamping bodies 50 are preferably placed at each pipe end so that the two long leg parts 56 face (tilt) radially outwards and away from each other. When the assembly is screwed together, the two coupling pieces 50 are forced towards each other and the surface 58 is flipped over and is pressed down onto the pipe surface, and the spike(s) 59 are forced down into the surface. This functions according to a moment arm or lever principle which is obtained by the elements having a crowbar-like shape which concentrates the force that is generated by tightening the bolts 34 that run axially through the flange 30,31 and thereby force the "crowbar" element down where the protrusion/spike/cam 59 cuts into the steel of the pipe surface. As can be seen, the support rings 52, at each end, are placed radially immediately under respective flanges 30,31 , something which means that one has a stable assembly, as the support ring 52 holds the clamping bodies 50 together.

Furthermore, the bolts 34 run a long way down into the gap which is between two adjoining clamping bodies 50, so that the opposite flange sides lie against separate longer arms 56 of the clamping body 50. When the nut 40 is tightened, a force is set up against the upwardly extending longer leg parts 56 of the clamping bodies, as shown by the arrow P in figure 6a. As a consequence of each clamping body having an angled seat surface 57-58, it will be flipped from its fitting position (figures 1 -2-3) to its fastening position (figures 4-5). In the fastening position, the spike(s) 59 are forced into the pipe surface and ensure that the connection piece sit firmly on the pipe end. It is advantageous if the metal of the clamping body, and thereby the spike 36, is harder than the metal of the pipe 10,20, as it can easily be forced in.

According to an alternative, the pipes can be made from plastic and the connection pieces made of metal, and the flange can also be fitted against another type of flange with the same number of bolts.

This provides a solid grip of the steel in the pipe that holds the lever flange securely locked at the pipe ends. A leakproof pipe is ensured by a gasket 1 1 being placed between the plane pipe ends 10,20. This can be held in place by a seal carrier or in any other way.

The gasket can be comprised of different materials depending on the type of medium that goes through the pipe. The gasket can be comprised of metal and / or another material. Often used is a combination of metal and another gasket, for example, steel and Viton. The invention is consequently characterised in that energy collects at one point with the help of the ring 52 that runs around the pipe and enables counter forces so that a lever principle/ moment arm is set up. This ring 52 around the pipe, and also its fitting of a number of clamping bodies around the pipe circumference, and the resulting moment arm/ level principle during the tightening of the bolts 34 are what distinguishes from other known and similar solutions.

Claims

P A T E N T C L A I M S.

1 . Clamping body for the fastening to a pipe end where the clamping body can be reset from a fitting position at the circumference surface of the pipe end to a fastening grip into the pipe surface, characterised by

- a combined unit of a support ring (52) to be threaded onto a pipe end and a number of angled clamping bodies (50) to be guided in between the underside of the support ring (52) and the pipe surface, and

the underside of the clamping body (50) is comprised of a first surface (57) set up to lie against the pipe surface during the fitting of the clamping body and a second surface (58) which, by a resetting of the clamping body, is set up to form an engagement with the pipe surface for said fastening grip.

2. Clamping body according to claim 1 , characterised in that the first (57) and second (58) surfaces are mutually angled, as the second surface (58) is comprised of a number of sharp-edged ridges, cams or spikes (59) set up to grip into the pipe surface.

3. Clamping body according to claimsl -2, characterised in that the clamping body (50) is set up to be pushed in under the support ring (52) with the first surface

(57) without the sharp-edged spikes facing the pipe surface and, in a pivoting movement of the clamping body (50) by a tightening operation, the second surface

(58) with the sharp-edged ridges, cams or spikes is flipped over so that these penetrate into the pipe surface.

4. Clamping body according to one of the preceding claims, characterised in that the support ring (52) is placed radially immediately under a flange (30,31 ) which, during the fitting, is displaced axially to set up said fastening grip.

5. Clamping body according to one of the preceding claims, characterised in that the underside of the clamping body is comprised of a rounded seat (53) for positioning against the support ring (52).

6. Clamping body according to one of the preceding claims, characterised in that the clamping body (50) has mainly an L-formed cross section with one short leg (54) and one long leg (56), as a transition in the underside between the leg parts (54,56) forms a rounded seat (53) for the support ring (52).

7. Clamping body according to one of the preceding claims, characterised in that the underside of the clamping body of the first and second surface parts (57,58) , respectively, is gently arched in the direction of the circumference when formed with an arch shape corresponding to the pipe surface it shall lie against, or the clamping body (50) defines a rounded transition between said surface parts so that the pivoting can take place without much resistance.

8. Clamping body according to one of the preceding claims, characterised in that the number of flippable clamping bodies (50) is equal to the number of clamping bolts (34), as each clamping body is placed squeezed in between two adjacent bolts (34) or two or more clamping bodies are squeezed in between two adjacent bolts.

9. Method for the connecting together of two pipes (10,20) end-to-end, where the clamping body, as given in claims 1 -8, is placed on each pipe end and is reset from a fitting position to a using position where the clamping body forms a fastening grip in the surface of respective pipes by axially directed tightening of tightening bodies (30,31 ) against the rear side of the clamping bodies (50), characterised in that

-a support ring (52) is threaded in over each pipe end some distance inside the pipe end,

-a number of angled clamping bodies (50) are guided in from the pipe end between the underside of each support ring (52) and the pipe surface as the clamping bodies are arranged mutually spaced apart around the circumference of the pipe end, so that the support ring (52) is positioned in each underside of the clamping body (53), and

-by axial tightening of the tightening bodies (30,31 ) the clamping bodies (50) are pivoted so that a surface part (58) in the underside of each clamping body (50) is forced into a fastening grip against the pipe surface.

10. Method according to claim 9, characterised in that each clamping body/ connecting piece (50) is squeezed in under the support ring (52) which thereby holds the whole assembly in place at the pipe end.

1 1 . Method according to claims 9-10, characterised in that an angled clamping body (50) is used with an arch form or L-form that defines a seat (53) in its underside for the positioning of the support ring.

12. Method according to one of the claims 9-1 1 , characterised in that the underside of the clamping body (50) used defines two mutually angled bottom surfaces (57,58), a first bottom surface (57) which is even and smooth and which, during the pushing in under the support ring (52), glides against the pipe surface, and an adjoining second bottom surface (58) which is comprised of a number of cams or spikes (59), and by a rotation of the clamping body (50), the cams/spikes penetrate into the pipe surface to form a fastening grip.

13. Method according to one of the claims 9-12, characterised in that each support ring (52) at a pipe end is placed radially immediately under a respective flange (30,31 ) and it is squeezed in by the clamping bodies (50), flanges (30) and bolt heads (35,40) to form a stable assembly.

14. Method according to claim 9, characterised in that a tightening casing with an inwardly turning flange and internal threads is used and by a screwing together with a corresponding, opposite casing with an inwardly turning flange and external threads, flips the clamping bodies at each pipe end over to form the engagement grip with the pipe surface as a consequence of the flanges lying against the rear side of the clamping bodies and leads to these being flipped down into a fastening grip.

15. Construction for the connection of two pipes (10,20) end-to-end, or pipe against flange, blinding plug or valve, where the clamping body on each pipe end is set up to be reset from a fitting position to a using position where each clamping body forms a fastening grip in the circumference surface of the respective

pipes/flanges by the tightening of tightening bodies (30,31 ) against the rear side of the clamping bodies (50), characterised by

- a combined unit of a support ring (52) to be threaded in over a pipe end and a number of angled clamping bodies (50) to be guided in between the underside of each support ring (52) and the pipe surface, and

each underside of the clamping body is comprised of a first surface (57) set up to lie against the pipe surface during the fitting of the clamping body and a second surface (58) set up to form an engagement with the pipe surface for said fastening grip.

16. Construction according to claim 15, characterised in that the first (57) and second (58) surfaces are mutually angled, as the second surface (58) is comprised of a number of sharp-edged ridges, cams or spikes (59) set up to grip into the pipe surface.

17. Construction according to claims 15-16, characterised in that the clamping body (50) is set up to be pushed in under the support ring (52) with the first surface (57) without sharp-edged spikes facing the pipe surface, and, by a rotary movement of the clamping body (59) by a tightening process, the second surface (58) with the sharp-edged ridges, cams or spikes is flipped over so that these penetrate into the pipe surface.

18. Construction according to one of the claims 15-17, characterised in that the support rings (52) at each end are placed radially immediately under respective flanges (30,31 ) and are squeezed in by/between clamping bodies (50), flange(s) (30) and bolt heads (35,40), something which means one will have a stable assembly.

19. Construction according to one of the claims 15-18, characterised in that the underside of the clamping body (50) is comprised of a rounded seat (53) for the positioning against the support ring (52).

20. Construction according to one of the claims 15-19, characterised in that each clamping body (50) has mainly an L-formed cross section (figures 3, 5 and 9), with a short leg (54) and a long leg (56), as a transition in the bottom side between the leg parts (54,56) forms a rounded seat (53) for the support ring (52).

21 . Construction according to one of the claims 15-20, characterised in that the underside of the clamping body of the first and second surface parts (57,58), respectively, is gently arched (in the direction of the circumference when fitted) with an arch shape corresponding to the pipe surface the surface parts shall lie against, or the clamping body (50) defines a rounded transition between said surface parts (figure 3) so that the rotation can take place without much resistance.

22. Construction according to one of the claims 15-21 , characterised in that the number of flippable clamping bodies (50) is equal to the number of clamping bolts (34) as each clamping body is placed squeezed in between two adjacent bolts.

23. Application of a clamping body for the connection of a pipe end with an adjoining pipe end, such as comprising a pipe stub in connection with a blinding plug, a flange or a pipe-formed entrance to a valve unit, as a blinding plug can be comprised of a plate form against which said pipe end shall be forced, while a flange or T-connection is comprised of a pipe stub with the approximately same diameter as the pipe.