FI12152U1 - Branched pipe relining - Google Patents

Abstract

A tube sock for repairing a branched tube, the tube sock comprising: (a) a first portion (41) of a generally cylindrical main tube (1) formed of one or more pieces by joining the pieces together by one or more longitudinal seams (43); (b) a second portion (42) of a generally cylindrical tube (1) extending from the main pipeline (1) formed of one or more pieces by joining the pieces together by one or more longitudinal seams (44) and communicating with the first tube (1); with the part (41) such that the fluid can flow between the first part (41) and the second part (42), characterized in that the first part (41) and the second part (42) are connected only to the first part (41) and the second part (42). ) with longitudinal seams (43, 44). In addition, protection requirements 2-5.

Description

HAAROITUSSUKKA

Background of the Invention

The invention relates to a sock for use in pipe tubing. In particular, the invention relates to a branching piece for use in pipe branches.

It is generally known to repair damaged pipes by twisting. In this case, a tube sock is introduced into the inner part of the tube, which typically comprises a fabric material impregnated with a curable resin impregnated against the inner wall of the tube and a plastic film thereon. Often, the fabric material is sandwiched between two plastic films, with one plastic film settling against the inner surface of the repairable tube and the other forming a new inner surface of the repaired tube.

The tube curing resin is cured, for example, by setting the tube temperature so that curing occurs. At the same time, the sock is pressed firmly against the pipe wall so that the corrected pipe has a sufficiently large internal diameter. After curing, the sock forms a rigid structure against the tube wall. In this way, the sock forms a new tube based on the original tube inside the original tube structure.

Branched piping is a problem when piping. Tube branching is discussed, inter alia, in WO-A-95/08737. In the method described, a sock with an opening at the crotch is inserted into the main pipeline. A second sock is placed in the connecting tube, which is joined to the opening in the main tube sock, and the socks are sealed together so that a collar is formed at the connection point inside the socket in the main tube. The socks sewn together are stretched and cured at the same time.

US-A-2011/0290359 (Figure 3) describes how to insert a Y or T branch into a branch of a pipe.

After the branching piece, a second sock is introduced into the tube and attached to the branching piece. The publication does not give details of the structure of the branching piece.

Brief Description of the Invention

The present invention comprises a tube sock for repairing a branched tube, the tube sock comprising: (a) a first portion (41) of a generally cylindrical main tube (1) formed of one or more pieces by joining the pieces together by one or more longitudinal seams (43); (b) a second portion (42) of a generally cylindrical tube (1) extending from the main pipeline (1) formed of one or more pieces by joining the pieces together by one or more longitudinal seams (44) and communicating with the first tube (1); with the part (41) so that the fluid can flow between the first (41) and the second (42) parts, and wherein the parts (41,42) are connected to each other only by longitudinal seams (43) with respect to the first (41) and second part (42). , 44).

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 shows a branched tube.

Figure 2 shows how the sock is formed from a single rectangular piece.

Figure 3 shows a cross-section of a tube sock.

Figure 4 shows a tube sock in accordance with the invention formed of three pieces by seaming the pieces together with four seams. Figure 5 shows a branch of the pipe where the branched pipe joins the frame pipe through an intermediate part.

Figure 6 shows a tube sock in accordance with the invention in which the seams are covered with tape.

DETAILED DESCRIPTION OF THE INVENTION

The tube sock according to the invention consists of two parts which are joined together seamlessly or only by longitudinal seams, each of which sits in its own pipeline. Each part is generally cylindrical in shape.

The sock consists of a fabric or felt-like layer and a plastic film. When installing the sock in the tube, the felt layer is positioned against the inner surface of the tube and the plastic film forms a new inner surface of the tube. The felt layer is mixed with an epoxy resin, which is allowed to cure when the sock is placed inside the tube. The cured sock then forms a new tube inside the tube to be repaired. As is known in the art, the epoxy resin can be cured by heating the tube to a temperature where the epoxy resin cures or by keeping the tube at a temperature where the epoxy resin cures.

The sock may have two layers, with the plastic film on one side of the felt layer. It is also possible to make a sock in three or more layers. In this case, the plastic film may be on both sides of the felt layer.

The sock is made of one or more generally rectangular pieces. When the sock is made of a single piece, the edges of the piece are turned opposite to form a cylindrical jacket. The edges are sewn together by, for example, sewing, gluing or welding to form a sock. When forming a seam, it is preferable that the edges face each other. In this case, the sock is of uniform thickness throughout its circumference. In addition, if the edges overlap, there is a risk that moisture may accumulate between the surfaces.

As described above, the sock according to the invention consists of two parts joined together only by longitudinal seams. This means that there is no seam at the junction of the parts that will rotate either part of the sock circumferentially. This will allow the sock to fit better at the joint. The sock also fits better against the tube wall. In this case, the remanufactured tube is very similar to the shape of the original tube and a sufficient cross-sectional area is obtained inside the tube. There is no additional flow resistance in the tube so renewed and the risk of leakage is low.

Particularly preferably, the tube sock is made of three pieces so that the pieces are joined to each other by four longitudinal seams. It has been found that in this case the sock fits better into complicated tubular shapes, such as the tube shown in Figure 5. Such a sock retains its shape well in complex tubular structures and sits flat against the tube wall. For example, a three-seam sock made from two pieces works well at a simple crotch. However, for example, in the tube of FIG. 5 with two corners, the sock with three seams does not fit well against the surface of the tube. This makes the sock with four seams easier to install and saves installation time. This will make installation cheaper.

Preferably, the seams are protected with waterproof tape. This will reduce the risk of leakage.

The tube sock of the invention may be applied using, for example, the method described in WO-A-95/08737, Figure 1. The method involves inserting the sock into a robot, preferably equipped with a camera. The robot inserts the sock in such a way that the part of the sock that fits into the crotch of the sock is at the junction. Once in place, the sock is pressurized to press against the inside wall of the tube. The epoxy resin impregnated into the sock is then cured to form a new tube inside the original tube.

Fig. 1 shows a branched pipe where the branch pipe (2) differs from the frame pipe (1) at the branch point (3).

Figure 2 shows a conventional method for making a tube sock from a single rectangular piece. Paragraph 11, a second edge (11a) is turned to the second edge (11b) against the direction of the arrow shown. The edges (11a) and (11b) are placed opposite or partially overlapping and the seam is formed at the junction as described above.

Fig. 3 is a cross-sectional view of a tube sock in which the seam (12) is formed by aligning the edges (11a) and (11b). In this case, the sock is tightly engaged against the inner surface of the tube. The sock also has the same thickness across the entire pipe circumference.

Fig. 4 shows a tube sock in accordance with the invention, comprising a part (41) which fits in the frame tube (1) and a part (42) which fits in the branch tube (2). The tube sock (41.42) is made of three pieces. One of the pieces forms the right-hand half (45) of the part (41) which fits into the frame tube (1). One of the pieces forms a portion (41) of the housing tube (1) extending up to the fork (40) of the left half (46) and the lower half (47) of the portion (42) of the branch tube (2). The third body forms the upper half (48) of the portion (42) of the branch tube (2) and the left half (49) of the portion (41) of the branch tube (1) forward of the branch (40). The portions are seamed by four longitudinal seams, one of which (43) is formed on a portion (41) of the body tube (1) and the other (44) of a portion (42) of the branch tube (2). One of each of the seams (43, 44) remains behind the pattern and thus does not appear in the figure. In this way the seams (43,42) of the sock parts (41,42) are positioned longitudinally in each part of the sock (41,42), and none of the seams (43,44) rotates the part (42) or the tube (1) part (41) circumferentially.

Fig. 5 shows a tubular structure in which the branch tube (2) is connected to the main tube (1) via an intermediate part (52). The intermediate part (52) forms an angle α with the frame pipe (1) and an angle (α + 90 °) with the branch pipe (2). Attaching such a tubular structure is particularly challenging as the sock may become entangled at the corners and not properly seated against the tubing. Wrinkles are formed at the corners, which dampen the filing fluid, creating a risk of flooding to the environment. This causes the sock to pile up and its structure to be irregular at the corners. Due to wrinkles, the remanufactured pipe may also remain weak near the corners and thus increase the risk of leakage.

Fig. 6 shows a tube sock comprising a part (41) which fits in the frame tube (1) and a part (42) which fits in the branch tube (2). The sock is made by seaming the parts with four longitudinal seams, two of which are visible (43, 44) and the other two are positioned on opposite sides of them and thus do not appear in the figure. The seams are taped with waterproof tape (65, 66) to eliminate leaks.

It has been found that the tubular sock of Figures 4 and 6 fits well in tubular structures of various shapes and is particularly advantageous in the structures of Fig. 5. In this case, the sock does not tighten or wrinkle at the corners, but rests freely against the inner surface of the tube in all parts of the tube (1, 2, 52). This results in a uniform sock thickness and a consistent piping system. This will minimize the risk of leakage.

Claims (5)

PROTECTION REQUIREMENTS 1. Rörfoder för renovering av ett förgrenat rör, whistling rörfoder omfattar: (a) en allmänt cylindrisk första del (41) som röder sig i en ududrörslinje (1) och som har utformats av et eller flera stycken genom att foga stopkena med en eller flera längsgående fogar (43); (b) en allmänt cylindrisk andra del (42) som litter sig i en rörlinje (2) som förgrenar sig från interesudrörs linjen (1) och som harformat av etler flera stycken genom att to ihop styckena med en eller flera längsgående fogar ( (44) och som på så provision står i förbindelse med den första delen (41), som röder sig i interesudrörs linjen (1), att vätskeflöde möjliggörs mellan den första (41) och den andra (42) delen, vännetecknat av att den första (41) och den andra (42) delen har fogats ihop endast med fogar (43, 44) längsgående i förhållande till den första (41) och den andra (42) delen. A tube sock for repairing a branched tube, the tube sock comprising: (a) a first portion (41) of a generally cylindrical main tube (1) formed of one or more pieces by joining the pieces together by one or more longitudinal seams (43); (b) a second portion (42) of a generally cylindrical main pipeline (1) formed by one or more longitudinal seams (44) disposed on one or more longitudinal seams (44) and communicating with the first pipeline (1) disposed on the main pipeline (1). with the part (41) such that the liquid can flow between the first (41) and the second (42) part, characterized in that the first (41) and the second (42) part are only interconnected to the first (41) and second part (42). ) with longitudinal seams (43.44). Rörfoder enligt krav 1, kännetecknat av att de stycken som bildar den första (41) och den andra (42) delen har fogats ihop med fyra längsgående fogar (43, 44). Pipe sock according to claim 1, characterized in that the pieces forming the first (41) and the second part (42) are joined by four longitudinal seams (43, 44). 3. Rörfoder enligt krav 2, kännetecknat av att fogarna (43, 44) harildats genom att på så setting förbinda och foga ihop styckets eller styckenas två kanter att kanterna sert motigand. Pipe sock according to claim 2, characterized in that the seams (43, 44) are formed by joining and seaming the two edges of the piece or pieces together so that the edges are facing each other. 4. Rörfoder enligt något av kraven 1-3, kännetecknat av att fogarna har lambs med vattentät tejp (65, 66). Pipe sock according to one of claims 1 to 3, characterized in that the seams are taped with waterproof tape (65, 66). Pipe sock according to one of claims 1 to 4, characterized in that the longitudinal seams (43, 44) are formed by sewing, welding, or gluing. SKYDDSKRAV 5. Rörfoder enligt något av kraven 1-4, kännetecknat av att de längsgående fogarna (43, 44) harildats genom att sy, svetsa eller Limma.