DE10120840C1 - System for welding reinforced concrete pipe sections, for a buried pipeline, has a welding ring inserted into an open ring zone and/or ring groove at the end side to give an easy and rapid bonding action - Google Patents

Abstract

The system to bond pipe sections together, and especially reinforced concrete pipes, uses a pipe (1) with an inliner (3) which is shorter than the mantle (2). An open ring zone (16) at the end side is left free at both ends of the pipe. The mantle has an open interior ring groove (4) at the end side of the pipe. A welding ring (5) has an axial length which is at least twice the axial width of the ring zone and/or the groove, to be laid in the ring zone and/or ring groove of two pipes to be bonded together, and the welding ring is welded to the pipe sections with the inliner after the insertion of a metal ring (9).

Description

Field of the Invention

The invention relates to a method for connecting Pipe elements, especially of reinforced concrete jacking tubes, which have a jacket and a weldable Have inliners, the tubular elements in axial Direction are lined up and with the Inli ver connected pipe elements together be welded.

The invention further relates to a ver bundle of such tubular elements.

State of the art

A method of the type mentioned is from Practice when laying reinforced concrete jacking pipes known. Here, the pipe elements are either in Tunneling laid underground or individually in one Digging or sunk a pit. The pipe elements typically consist of a concrete jacket and egg a tubular steel liner. After assembling the pipe elements and welding the inliners together the inliner guarantees closing pipe elements the tightness of the composite, especially when high internal pressures.  

The pipe elements of a tunnel in the desired one Depth underground horizontally or obliquely propelled. This is at one end of the pre driven pipe always put a new pipe element and with the already advanced and ver bound pipe elements connected.

When laying in a trench or pit become the pipe elements in the trench or the pit lowered, lined up and connected together the. The connection can be started immediately of each pipe element or even the formation of one (Loose) composite of pipe elements strung together ten.

In any case, the pipe elements before Ver welding the inliners aligned to each other and if necessary be calibrated, the radial offset of two to connecting pipe elements significantly smaller than that Wall thickness of the inliner must be otherwise, otherwise other inliners to be connected are not reliable and can be welded together in a pressure-stable manner. The same applies to an axial tilt, wel che must be small, so that not between each other subsequent inliners sometimes a disturbingly wide A welding gap is created.

The exact alignment and, if necessary, calibration is independent depending on the laying method, complex, lengthy and cumbersome. This applies in particular if the Space in the tunnel is limited and thus the movement freedom of movement of those responsible for the alignment  Worker is restricted anyway. Because the jacking technology especially in densely populated and ver congested areas, such as the inner city ten, is used, for reasons of a minor Influencing the tunnel as far as possible be narrow and the construction work carried out quickly become.

Technical problem of the invention

The invention is based on the technical problem a method for connecting pipe elements, esp particular of reinforced concrete jacking pipes, to be specified at which the effort of aligning individual Rohrele ment is reduced to each other and by means of which thus in a simple, fast and inexpensive way a composite of tubular elements, i. e. a pipeline, can be manufactured to meet all requirements obviously compressive strength is sufficient.

Basics of the invention

He teaches how to solve this technical problem finding that pipe elements are used, at wel Chen the inliner in the axial direction of a Rohrelemen tes shorter than the coat and egg at both ends Nes tubular element one end of the tubular element leaves open annulus and where the coat inside a first face of the tubular element has an open first annular groove that a weld-in ring, whose axial extension is at least twice that  axial extension of the annulus and / or the ring is in the annular spaces and / or the annular grooves two pipe elements to be connected are inserted, and that the welding ring with the inliners of the connecting pipe elements is welded. The one direction of the (first) ring groove allowed in the jacket it, a weld-in ring that is knife and possibly wall thickness from the inliner speaks, radially and also axially offset or tilted insert into a tubular element.

The invention is based on the knowledge that through as it were, the interposition of a welding ring the tolerances between two inliners to be connected the axial displacement or the tilt doubled can be and consequently to the alignment of the raw rele to each other lower requirements len are. This will reduce the effort involved in laying or stringing the pipe elements together considerably reduced and still a high security at the Welding and consequently the compressive strength hold. The double compared to the prior art In contrast, the effort of welding is negligible.

Another major advantage is that the one Ver welding ring with the inliners using butt seams can and should be welded when it comes to welding Lich the resilience and pressure resistance special Claims are made. Less resilient fillet welds, as known from (direct) connecting inliners, can be completely avoided if required Lich.  

Another advantage is that the pipes no longer face-to-face with each other must lie. Rather, one can face the concrete elasticity more elastic spacer between two Pipe elements are installed. This spacer is then able to make flaws in the surface of the individual NEN end faces of the concrete jacket, for example position-related defects or manipulation bridging outbreaks and when driving the force nevertheless essentially flat and strong to transfer conclusively, without it to tilt the Pipe elements come together and damage to the inliner arise during tunneling.

The invention finally teaches a composite of it Pipe elements according to the invention, with more than two Pipe elements with the inventive method are connected.  

Preferred embodiments

With regard to the tubular elements, it is preferred that the jacket made of non-metallic material, preferably two made of concrete, and the weldable metal liner, preferably made of steel.

With regard to the method, it is preferred if between pipe elements to be connected before Ver welding the welding ring with the inliners Spacer ring is placed coaxially to the pipe elements, whose outside diameter is less than or equal to the outside diameter of the pipe elements and its inside diameter larger than the inside diameter of the man means in the area of the annulus. By means of this Spacer ring, which made of a material with against is formed over concrete of higher elasticity at for example wood or plastic, pipe elements be joined together without manipulation Outbreaks in the end-face concrete, for example through Anecken or the like, fear to be brewed chen. In addition, the spacer bridges any Defects in the concrete in the face of the jacket and ensures an equal in the case of tunneling moderate power transmission. The thickness of the spacer ring in the axial direction when dimensioning the axial extension of the weld ring self ver to be taken into account constantly.

Essentially, the dimensioning applies the relationship l = 2r + d - 2 s, where l is the axial extension of the welding ring, r the axial Extension of the annulus and / or the first  Ring groove, d the axial thickness of the spacer ring and s the width of the welding gap between the welding ring and are inliners. s can be used with suitable customary Welding preparation can also be 0. d can be 0 if no spacer ring is used.

At the ends of the tubular elements, a ring can be inserted into the be inserted first annular groove, the dimensions of which Do not exceed the dimensions of the first ring groove. This ring can be made of rigid foam, in particular special styrofoam, be formed and is therefore light manually editable. This allows the area of first ring groove for offset or tilting for one Adjust the insertion and fixation of the welding ring, by cutting hard foam away at suitable points is, so that the welding ring in the ge wanted exact alignment for the mutual Welding comes to rest. Because the rigid foam itself can be easily edited, the effort compared to classic calibration only very low. The lead Hard foam also fills most of the free remaining part of the first annular groove, so that at a possible backfilling of remaining void clear, for example with flowable sealing compounds, little material is needed.

It is further preferred if tubular elements are used det, which in the jacket one to the first ring groove subsequent second ring groove open on the face point, and in which the second ring groove the inliner partially engages, and that before welding of the weld ring with the inliner from a metal ring a material with high thermal conductivity, such as copper  or copper alloys that contact the inliner rend engages and which in part of the first Ring groove protrudes into the second ring groove becomes. This metal ring works with the Ver welding the inliner with the welding ring as Weld pool.

The pipe elements can be attached to the end of the inliner specialist weld preparations.

The welding ring can be open in a cross joint. This allows, for example, the welding ring to be transported through a tubular element. in the The individual then becomes the welding ring outside of a tubular element pulled together radially, by one or more pipe elements in the longitudinal direction extending the pipe elements and in a predetermined annulus and / or vorbe agreed first ring groove expanded. Then the Cross joint, optionally with a welding preparation see before or after welding the weld ring in turn welded to the inliners.

The welding ring can be at least two in front of each other preferably opposite and radial Have bores, preferably threaded bores. These are used to fill sealing material in ver permanent voids and their ventilation. hereby following the welding of the weld ring this on the outer circumference against corrosive media sealed. The same applies to the area of Welds. For this, after welding the Welding ring with the inliners and possibly the  Cross impact through a hole below, preferred via a screwed-in threaded connector, one Filled sealing compound and an outside of the one sweat ring remaining cavity over the counter Overlying side or bore vented and thereby practically completely filled with sealing compound. The Drilling is preferably done after backfilling welded. Bitumi comes as a sealing compound, for example Nose 2-component sealant in question.

In an even higher offset version In the invention, a welding ring is used, which consists of several ring segments, preferably 2 to 10, most preferably 2 to 5, is formed. The Ring segments are then against each other in the axial direction which then into the annulus and / or the first Ring groove inserted and with each other and with the Inli welded. The allowable offset multiplied then according to the number of ring segments. The reduced effort for alignment is included of course the increased welding effort counter attribute.

In the following, the invention is based on only Figures showing exemplary embodiments he closer purifies. Show it:

Fig. 1 is an exploded view in the area of two pipe elements to be connected, and

Fig. 2 shows a cross section through interconnected tubular elements in the region of the connection.

The schematically illustrated in FIGS. 1 and 2 have to be connected pipe elements 1 in the exporting approximately example mm an outer diameter of 1520. It consists of a concrete jacket with a thickness of 150 mm and a steel inliner with a thickness of 12 mm, whereby the ends of the steel inliners are provided with weld seam preparations in accordance with DIN 2559 Form 22 . At each end of a tubular element 1 , an open first annular groove 4 is set up, which has a depth of 60 mm and a width of 20 mm. A ring 7 made of rigid foam with an inner diameter of 1220 mm and an outer diameter of 1240 mm and a width of 60 mm can be inserted therein, which then ends flush with a pipe element end. In a second annular groove 8 , which has a depth of 2 mm and a width of 1.5 mm, is a metal ring 9 made of copper, with an inner diameter of 1220 mm, and an outer diameter 1222 mm and a width of 3 mm as a weld pool fuse inserted. For this purpose, the ring 7 must be compressible in this area. The ring 7 introduced after the assembly of the metal ring 9 holds the metal ring 9 in its position.

Before laying, the pipe elements 1 are prepared by inserting the metal ring 9 and the ring 7 . The thus prepared pipe elements are then aligned with each other and brought together, with a spacer ring made of wood, with an inner diameter of 1245 mm, and an outer diameter of 1500 mm and a width of 10 mm, placed coaxially to the tubular elements between the end faces , Then the ring 7 (or both rings 7 of the two tubular elements 1 ) is machined so that a welding ring 5 can be inserted, aligned and fixed with the proviso that problem-free welding with the inliners 3 is possible.

Then a welding ring 5 with an outer diameter of 1220 mm, a material thickness of 12 mm and a width of 130 mm, which is open in the transverse joint and provided with weld preparation according to DIN 2559 Form 22 in the area of all points to be welded, radially contracted and through a tube element 1 is placed in the area between the opposing strin surfaces. There the welding ring is expanded again and comes to rest in the prepared position and orientation. Then the welding ring 5 is welded to the inliners 3 and the cross joint according to DVGW worksheet G 462.

The weld-in ring has two opposite M8 threaded bores 13 in the middle of the jacket surface. One of the threaded holes 13 is in the welded-in state facing the floor ("6 o'clock" position) and the other threaded bore 13 is in the "12 o'clock" position. Through the Ge directed to the ground bore 13 a bituminous 2-component mass is poured through a screwed filler neck and the cavity through the opposite threaded bore 13 vented. If the bituminous 2-component compound emerges from the opposite threaded hole 13 , the cavity is filled and after cleaning the threaded holes 13 , they are welded.

Various variants are possible in the context of the method according to the invention. Thus, the welding ring 5 may, for example, into one end of th already Verleg or pre exaggerated composite of Rohrele elements are inserted 1, wherein the welding ring 5 may comprise a transverse joint 11, but not necessarily must. It is understood that the end may be previously equipped with a metal ring 9 and / or ring 7 in the manner described above. Then a correspondingly prepared end of a pipe element 1 to be attached can be put over the protruding part of a welding ring 5, as it were, with the interposition of a spacer ring 6 . The welds can all be done after attaching. It is also possible to add the welding ring 5 before the welding to first at one end and then to weld the other end after the welding. Otherwise, the above explanations apply analogously.

An assembly kit according to the invention can be seen in particular from the illustration in FIG. 1.

Claims (9)

1. A method for connecting pipe elements ( 1 ), which have a jacket ( 2 ) and a weldable in liner ( 3 ), the pipe elements ( 1 ) being lined up in the axial direction and where the inliners ( 3 ) are lined up with pipe elements ( 1 ) are welded together, characterized in that
that pipe elements ( 1 ) are used, in which the inliner ( 3 ) in the axial direction of a Rohrele element ( 1 ) is shorter than the jacket ( 2 ) and at both ends of a pipe element ( 1 ) one end of the tubular element ( 1 ) open Leaves the annular space ( 16 ) free and in which the casing ( 2 ) has a first annular groove ( 4 ) which is open on the inside of the tubular element ( 1 ),
that a welding ring ( 5 ), the axial extent of which at least twice the axial extent of the annular space ( 16 ) and / or the annular groove ( 4 ) be in the annular spaces ( 16 ) and / or the annular grooves ( 4 ) two to be connected Pipe elements ( 1 ) is inserted, and
that the welding ring ( 5 ) is welded to the inliners ( 3 ) of the pipe elements ( 1 ) to be connected. 2. The method according to claim 1, characterized in that between the pipe elements to be connected ( 1 ) before welding the welding ring ( 5 ) with the inliners ( 3 ), a spacer ring ( 6 ) is placed coaxially to the tubular elements ( 1 ), the outside diameter of which is less than or equal to the outside diameter of the tubular elements ( 1 ) and its inside diameter is larger than the inside diameter of the jacket ( 2 ) in the region of the annular space ( 16 ). 3. The method according to any one of claims 1 or 2, characterized in that at the ends of the tube elements ( 1 ) a ring ( 7 ) is inserted into the first annular groove ( 4 ), the dimensions of which correspond to the dimensions of the first annular groove ( 4 ) do not exceed. 4. The method according to any one of claims 1 to 3, characterized in that tubular elements ( 1 ) are used who, which in the jacket ( 2 ) to the first annular groove ( 4 ) adjoining second open end groove ( 8 ), and in which the second annular groove ( 8 ) partially engages under the inliner ( 3 ), and that before welding the weld-in ring ( 5 ) to the inliner ( 3 ), a metal ring ( 9 ) which engages under the inliner ( 3 ) and which engages in a part of the first ring groove ( 4 ) protrudes into the second ring groove ( 8 ). 5. The method according to any one of claims 1 to 4, characterized in that tubular elements ( 1 ) are used which are provided at the end of the inliner ( 3 ) with weld preparations ( 10 ). 6. The method according to any one of claims 1 to 5, characterized in that a welding ring ( 5 ) is used, which is open in a transverse joint ( 11 ), that the welding ring ( 5 ) is pulled together radially, by one or more tubular elements ( 1 ) in Rich direction of the longitudinal extension of the tubular elements ( 1 ) and expanded in a predetermined annular space ( 16 ) and / or a predetermined first annular groove ( 4 ), and that the transverse joint ( 11 ), optionally provided with a welding preparation, before or after welding the welding ring ( 5 ) to the inliners ( 3 ). 7. The method according to any one of claims 1 to 6, characterized in that a welding ring is used, which at least two mutually preferably opposed and radially extending bores (13), preferably threaded bores (13), that after welding the Einschweißrings (5 ) with the inliners ( 3 ) and, if necessary, the transverse joint ( 11 ) through an underlying hole ( 13 ), preferably via a screwed-in threaded connector, a sealant is filled and a cavity ( 14 ) is vented via the opposite side and therefore practically completely with Sealant is filled, and that optionally the bores ( 13 ) are welded shut after filling. 8. The method according to any one of claims 1 to 7, characterized in that a welding ring ( 5 ) is used, which is formed from several ring segments, preferably 2 to 10, most preferably 2 to 5, and that the ring segments in the axial direction are then inserted into the annular space ( 16 ) and / or the first annular groove and welded to one another and to the inliners ( 3 ). 9. Composite of tubular elements 1 , wherein more than two tubular elements ( 1 ) are connected to one another by a method according to one of claims 1 to 8.