Method and device for producing a pipe lining priority claim

Abstract

The invention concerns a device and a method for producing a pipe lining in a pipe by introduction of a hardenable mass, wherein the mass is pumped through an outlet into an annular gap, which is formed by the pipe wall and the device arranged in the pipe. The device has a former, which is guided within the pipe in a predetermined spacing from the pipe wall along the pipe axis, so that the annular gap between the pipe wall and the former has a predetermined cross-section.

Claims

1. Method for manufacturing a pipe lining in a pipe by introducing a hardenable mass (22), characterized in that the hardenable mass (22) is pumped through at least one outlet (17) into an annular gap (8), which is formed by the pipe wall (4) and a former (2) that is spaced apart therefrom, wherein the former (2) is moved along its longitudinal axis (1) with its first end (10) ahead along the pipe wall (4).

2. Method according to claim 1, characterized in that the former (2) in a first radius (5) about the longitudinal axis (1) has a forming surface (3), which is smaller than a second radius (6), in which the pipe wall (4) is arranged and in that the former (2) is spaced apart from the pipe wall (4) by a wall (11), which is arranged at its first end (10) with a sealing edge (7), which is abutting slidably in the second radius (6) against the pipe wall (4), wherein the wall (11) and the sealing edge (7) close the annular gap (8) at the first end (10).

3. Method according to claim 1, characterized in that the former (2) is spaced apart from the pipe wall (4) by at least one spacer (9), which protrudes over the former (2) up into the second radius.

4. Method according to claim 1, characterized in that the hardenable mass (22) hardens during the movement of the former (2) until reaching the second end (15) of the former (2) opposite the first end (10) up to an inherent stability, which closes the annular gap (8) at the second end (15) and without the former (2) maintains the cross-section of the annular gap (8).

5. Method according to claim 1, characterized in that the hardenable mass (22) has a content of inert filler of at least 30% by volume in relation to the reactive constituents.

6. Method according to claim 1, characterized in that the hardenable mass (22) is produced by supplying the constituents without starter and the starter by separate delivery pipes (19a, 19b) to a mixer (18), to which a feed line (12) connected with the at least one outlet (17) is connected.

7. Method according to claim 1, characterized in that the pressure of the hardenable mass (22) is determined by means of a pressure sensor (P) and the supply of the hardenable mass (22) into the annular gap (8) is controlled in order to reach a predetermined minimum pressure in the annular gap.

8. Method according to claim 1, characterized in that before the introduction of the hardenable mass (22) into the pipe, a hose sleeve (20) is inserted into the pipe and the annular gap (8) is formed between the hose sleeve (20) and the former (2).

9. Method according to claim 1, characterized in that the pipe only from one end is accessible by the former (2) and, prior to the introduction of the hardenable mass (22), the former (2) is inserted through this end over the length into the pipe, over which the pipe lining is produced.

10. Device for use in a method for producing a pipe lining in a pipe by introduction of a hardenable mass (22), characterized by a former (2), which in a first radius (5) about its longitudinal axis (1) has a forming surface (3) and at its first end (10) has a wall (11) with a sealing edge (7), which is arranged in a second radius (6) to the longitudinal axis (1), which is larger than the first radius (5), with at least one outlet (17) discharging at the first end (10) for feeding the hardenable mass to the forming surface (3).

11. Device according to claim 10, characterized in that the forming surface (3) is cylindrical.

12. Device according to claim 10, characterized in that the former (2) has at least one spacer (9), which in an unloaded state protrudes from the former (2) up to 20% over the second radius and in a loaded state protrudes over the former (2) up into the second radius (6).

13. Device according to claim 10, characterized in that a feed line (12) is connected to the outlet (17), which feed line is connected to a mixer (18), to which separate delivery pipes (19a, 19b) are connected for a starter of the mass (22) and for the constituents of the mass (22) without the starter.

14. Device according to claim 10, characterized by a pressure sensor, which is configured to measure the pressure at the first end (10) of the former (2) and/or at a feed line (12) connected to the outlet (17), wherein the device is configured to pump the hardenable mass (22) through the outlet (17) until a predefined minimum pressure is reached.

Description

[0035] The invention will now be described more precisely with reference to the figures, which show schematically in

[0036] FIG. 1 two embodiments of the device,

[0037] FIG. 2 first embodiment of the method and

[0038] FIG. 3 a second embodiment of the method.

[0039] In the figures, the same reference numerals designate elements having the same function. FIG. 1 shows different variants of the device in a section along the longitudinal axis 1 of the pipe and of the coaxially arranged device on both sides of the longitudinal axis 1. The former 2 is formed cylindrical, respectively, and generally has a forming surface 3, which corresponds to the shape of the pipe wall 4 with a spacing. This spacing is the spacing between the first radius 5, in which the forming surface 3 is arranged, from the second radius 6, in which the sealing edge 7 is arranged. The second radius 6 is, at least while carrying out the method, equal to the inner radius of the pipe wall 4. For pipes with a round internal cross-section, the forming surface 3 is preferably cylindrical. The former 2 resp. its forming surface 3 is circumferentially closed, so that, in the method, an annular gap 8 is formed between the pipe wall 4 arranged in the second radius 6 and the forming surface 3 arranged in the first radius 5. At least one spacer 9, which preferably extends up into the second radius 6, protrudes over the forming surface 3. During the movement along the longitudinal axis 1, the sealing edge 7 and the at least one spacer 9 hold the former 2 in an approximately constant spacing from the pipe wall 4, so that the hardenable mass pumped into the annular gap 8 is formed into the cross-section of this annular gap 8 and hardens therein. Preferably, at least three spacers 9 are arranged in a distributed manner around the circumference of the former 2 resp. the forming surface 3. At the first end 10, the device has a wall 11a, which extends from the former 2 up to the sealing edge 7 in order to close the annular gap 8 at the first end 10. For pumping of hardenable mass onto or on the forming surface 3 resp. into the annular gap 8, the device has at least one feed line 12, which discharges on the forming surface 3 and/or on the wall 11a. While carrying out the method, the device is moved along its longitudinal axis 1 with the first end 10 ahead along the longitudinal axis 1 of the pipe wall 4 resp. of the former 2 (direction of movement 13). For this movement, the device has e.g. a traction means 14.

[0040] The wall 11a can be inclined with increasing radius against the second end 15 opposite the first end 10, so that by pumping hardenable mass into the annular gap 8 the wall 11a and thus the sealing edge 7 can be loaded against the pipe wall 4. The annular gap 8 is open at the second end 15, so that the hardenable mass is left behind by the device while moving the device with the first end 10 ahead. The hardenable mass is adjusted in such a manner that, up to the time, when it exits the device at its second end, it has a strength, which is sufficient for its inherent stability. Preferably, the hardenable mass is still sufficiently flowable when flowing around the spacer 9 to then subsequently merge resp. form a continuous phase, which is in particular circumferentially closed resp. water-proof. In general, the wall 11 resp. the sealing edge 7 arranged thereon is arranged in the second radius 6. The forming surface 3 of the former 2 is arranged in the first radius, which is smaller than the second radius, in which the sealing edge 7 is arranged, e.g. when it abuts against the pipe wall 4, in particular against the pipe wall 4 and is slidable along the pipe wall. Preferably, the spacers 9 extend up into the second radius. The pipe wall 4 has a radius, which is equal to the second radius 6.

[0041] An exemplary mass consists of the reactive resin with 100 parts by weight reactive Bisphenol A/F diluted epoxy resin (laminating resin, available as Epikure 240), 100 parts by weight of silica, 5 parts by weight of hydrophobic pyrogenic silicic acid (available as Aerosil R202, Evonik GmbH), 1 part by weight of titanium dioxide (available as Kronos 2056, Kronos Titan GmbH), which is mixed in the mixer with the hardener composition of 12.8 parts by weight of 3,6-diazaoctane-1,8-diamine, 5.1 parts by weight of epoxy resin (available as Epikote 828LVEL, Momentive Specialty Chemicals Inc.), 3 parts by weight nonylphenol, 12.8 parts by weight of silica sand F32 (available from Quarzwerke) and 0.77 part by weight of pyrogenic silicic acid, post-processed with polydimethyl siloxane (available as Aerosil 202, Evonik GmbH).

[0042] The shown embodiment of the device has a pressure sensor P, which registers the pressure that is exerted adjacent to the former by the hardenable mass. The measurement signal of the pressure sensor P, which is preferably displayed outside the pipe for an operator, serves to monitor the sufficient pumping of hardenable mass into the annular gap, resp. displays the escape of hardenable mass through holes in the pipe wall by dropping pressure. Preferably, the measurement signal of the pressure sensor is used to control the pumping of the hardenable mass resp. of its constituents in order to maintain a predetermined pressure of the hardenable mass at least at the first end.

[0043] FIG. 1 in the lower portion shows a variant of the device, in which the wall 11b arranged at the first end 10 extends radially from the former 2 and the feed line 12 discharges into this wall 11b. The spacer 9 is fitted with a travelling wheel 16 leading to reduction of the friction of the spacer 9 along the pipe wall 4.

[0044] Generally, the traction means 14 is formed by the at least one feed line 12, such as is shown in lower FIG. 1.

[0045] A ring disk 21 surrounds the former 2 and is slidable along the forming surface 3, preferably frictionally engaged. The ring disk 21 extends into the second radius 6 over the forming surface 3, so that the ring disk can abut on the pipe wall 4 and covers the cross-section of the annular gap 8 towards the second end 15 of the former 2. Upon filling the annular gap 8 by pumping hardenable mass into it, the ring disk 21 is pushed along the former 2 over its second end 15, wherein the ring disk 21 can adhere to the hardenable mass.

[0046] FIG. 2 shows the device and the method in a variant, in which the at least one feed line 12 discharges into an annular outlet 17, the wall of which forms the sealing edge 7. As shown, the pressure sensor P can be connected to the feed line in the area of the outlet 17.

[0047] Ahead of the feed line 12 a mixer 18 is arranged, to which, in turn, delivery pipes 19 are connected for the constituents of the hardenable mass, e.g. a first delivery pipe 19a for the hardenable mass, which, however, contains no starter, as well as a second delivery pipe 19b for the starter. By means of the mixer 18, which is fed with the components for the hardenable mass via the delivery pipes 19a, 19b, the components are mixed and thereby the hardening reaction is started. In this manner, a rapidly hardening mass can be produced and conducted through the feed line 12 with a short residence time into the annular gap 8, in which during the movement of the former 2 along the pipe wall 4 the mass achieves inherent stability when the second end 15 of the former 2 is moved over it.

[0048] The pressure sensor P can generally be connected to the at least one feed line, e.g. on the delivery pipe 19a for hardenable mass, which contains no starter, before or after the addition of a starter, e.g. before or after a mixer.

[0049] To reduce the adherence of the hardenable mass on the device, their surfaces, which come into contact with the hardenable mass, in particular the forming surface 3 and the wall 11, are coated with a separating agent, e.g. wax, in particular solid paraffin, or polytetrafluorethylene (Teflon).

[0050] FIG. 3 shows the method in the second embodiment, wherein prior to producing the pipe lining from a hardenable mass 22, a hose sleeve 20 is arranged against the pipe wall 4. The hose sleeve 20 can abut on the pipe wall 4 or be arranged to it with a spacing. The hose sleeve 20 can be pulled into the pipe or put in outside-inward, wherein the hose sleeve 20 is impinged on the inner side with pressure, e.g. air pressure, and put over in the pipe to be lined. When the hose sleeve 20 is present in the pipe, the pipe lining is produced in the hose sleeve 20 as described for the first embodiment, so that the hose sleeve is arranged between the pipe lining and the pipe wall 4. Therein, the hose sleeve 20 is pressed against the pipe wall 4 by the device, in particular by the sealing edge 7 and the spacers 9 resp. by the hardenable mass pumped into the annular gap 8. This embodiment has the advantage of covering breakthroughs of the pipe wall 4 by means of the hose sleeve 20, so that the hardenable mass to a lesser extent flows out from the annular gap 8 into breakthroughs of the pipe wall 4.

[0051] FIGS. 2 and 3 show a support 23 arranged within of the former, which support supports the former 2 against the first radius 5. Such a support, which can be preferably arranged in the axial area of the former between the spacer 9 and the second end 15 of the former 2, is optionally formed spring-loaded.

TABLE-US-00001 List of reference numerals: 1 longitudinal axis 2 former 3 forming surface 4 pipe wall 5 first radius 6 second radius 7 sealing edge 8 annular gap 9 spacer 10 first end 11, 11a, 11b wall 12 feed line 13 direction of movement 14 traction means 15 second end 16 travelling wheel 17 outlet 18 mixer 19, 19a, 19b delivery pipe 20 hose sleeve 21 ring disk 22 hardenable mass 23 support P pressure sensor