EP0292765A1 - Méthode pour souder des membranes imperméables dans des murs enterrés - Google Patents

Méthode pour souder des membranes imperméables dans des murs enterrés Download PDF

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Publication number
EP0292765A1
EP0292765A1 EP88107391A EP88107391A EP0292765A1 EP 0292765 A1 EP0292765 A1 EP 0292765A1 EP 88107391 A EP88107391 A EP 88107391A EP 88107391 A EP88107391 A EP 88107391A EP 0292765 A1 EP0292765 A1 EP 0292765A1
Authority
EP
European Patent Office
Prior art keywords
housing
sealing
welding
hoses
earth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88107391A
Other languages
German (de)
English (en)
Other versions
EP0292765B1 (fr
Inventor
Aloys Schlütter
Klaus Kaewert
Christian Witolla
Bernd Kopp
Hans-Jürgen Rösler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Naue Fasertechnik GmbH and Co KG
Original Assignee
Huels Troisdorf AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19873717999 external-priority patent/DE3717999A1/de
Application filed by Huels Troisdorf AG filed Critical Huels Troisdorf AG
Priority to AT88107391T priority Critical patent/ATE94240T1/de
Publication of EP0292765A1 publication Critical patent/EP0292765A1/fr
Application granted granted Critical
Publication of EP0292765B1 publication Critical patent/EP0292765B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
    • E02D19/185—Joints between sheets constituting the sealing aprons
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material

Definitions

  • the invention relates to a method for welding sealing sheets in diaphragm walls with bentonite fillings or the like.
  • Diaphragm walls are of great importance for the sealing of water-bearing containers or the sealing of water-bearing layers.
  • Diaphragm walls are created by excavating earth slits while filling them with supporting materials such as bentonite.
  • the bentonite can also be a solidifying agent, e.g. B. cement can be added.
  • Such diaphragm walls offer a certain degree of sealing.
  • the diaphragm walls are provided with sealing sheets.
  • the waterproofing membranes are lowered into the bentonite sludge. This poses the problem of connecting the sealing sheets at their edges.
  • a variety of proposals have been made in the past for joining the web edges.
  • the edge of the long waterproofing membranes should be connected to each other by overlapping seams or web seams using tried and tested welding equipment and technology.
  • the housing parts have seals in the area of contact with the sealing membrane and are pumped empty, so that the overlapping membrane edges are easily accessible for cleaning and welding.
  • the application of the housing including flushing and emptying had been regarded as so complex that the application only seemed to be restricted to extremely long sealing sheets.
  • the invention has for its object to conventionally weld narrow sealing sheets in earth slots.
  • the housing spanning the overlap region on both sides of the webs is also achieved on webs which are lowered in the longitudinal direction. So these are (narrow) tracks with a width that corresponds to the length of one piece of earth slots that could previously be made.
  • the invention also includes narrow narrower webs.
  • the housing spanning the overlap area is subjected to a vacuum after positioning.
  • the vacuum is created by suction pumps with the appropriate suction power.
  • the negative pressure causes the housing to lie against the webs and the ambient pressure supports the closing process of the housing and the seal.
  • devices are used for welding according to the invention, which clamp the web edges between them, so that the welding device is guided on the web edges or the welding device fixes the web edges in the intended welding position.
  • welding devices with forward run and reverse run are ver turns, the device after pumping empty the housing spanning the overlap area and flushing the welding surfaces is placed on top and runs down. The welding process then only starts with the reverse run from below.
  • the device commercially available for ultrasonic testing has very small dimensions, so that together with the o.
  • the welding machine has a space requirement of no more than 200 mm x 200 mm for the housing. As a result, the housing can be used in earth slots without an earth slot widening at the housing location.
  • the housing at the same time forms a bulkhead that closes the earth slot in the vertical and / or is composed of individual sections in the vertical and / or is provided as a centritriding of the housing parts and / or with a guide for the web edges and / or forms part of the lowering device for the webs.
  • Earth slots are made in sections. Each section has a max. Length from 5 to 6 m.
  • the max. Length depends on the chosen support medium. I.e. with an increasing proportion of bentonite in the bentonite suspension, the max. Length of the diaphragm wall section. On the other hand, it worsens with increasing Bentonite portion the handling of the bentonite suspension. Both the amount of bentonite suspension is extremely difficult, as well as pumping it and lowering the waterproofing membrane with the necessary equipment.
  • each diaphragm wall section finished with sealing sheets is first solidified before the diaphragm wall section adjoining it is started.
  • the overlap area of the sealing sheets must be excluded from the consolidation, since otherwise the sealing sheets can no longer be connected.
  • bulkheads are used for this. The bulkheads are drawn in in a vertical direction so that they close off the earth slot area at the edge of the sheet against the other earth slot filled with bentonite suspension. This can be used in different ways.
  • the bulkheads are formed by at least two hoses, one of which is arranged on each side of the track.
  • the tubes are located - seen in the horizontal - at one end of the preferably two-part housing.
  • a hose is then provided on each half of the housing.
  • the hoses are pumped up, this can be done relatively quickly with water.
  • the hoses block the earth slot due to a correspondingly large hose diameter, on the one hand enclosing the sealing membrane between them and on the other hand being supported on the surrounding soil.
  • the hoses unfold the surprising and very advantageous effect of securing the housing parts against buoyancy when the housing is pumped empty.
  • the membrane edges are accessible for a rinsing process or for the intended welding process.
  • the above Supporting the hoses in the earth slot necessitates hose diameters, which in total exceed the earth slot width.
  • the sum is preferably at least 10% larger than the earth slot width.
  • Rubber is a suitable material for the hoses. When the pressure hoses are relieved of pressure, the rubber easily detaches from the bentonite, which has solidified in the meantime. It is preferably provided that the hoses are attached in such a way that they protect the housing from the bentonite provided with solidifying agent.
  • the housing should be composed of individual sections.
  • the sections are connected by screws or quick-release fasteners.
  • the hoses then consist of individual sections which are coupled together.
  • the hoses are located at the sections and become assembled together with the sections. Screw connections or quick-release fasteners serve as coupling pieces for the hoses.
  • at least one of the hose sections protrudes relative to the associated housing section at the connection point between two housing sections, so that the hoses can slip into one another at the connection point and can cover the connection point or the coupling piece. This is facilitated by a coupling piece, the outside diameter of which is smaller than the inside diameter of the hose. To completely cover the coupling piece, the protruding excess length of the hose section is at least equal to the length of the coupling piece.
  • connection of the housing parts is preferably effected by the liquid pressure of the bentonite suspension column. According to the invention, this can be achieved in such a way that after the housing has been introduced into the earth slot, the upper housing sections are pressed against one another and bentonite suspension is pumped out from above. Even with a slight difference in the height of the suspension level in the housing compared to the surrounding bentonite suspension level, the surrounding bentonite suspension develops so much contact pressure that the housing parts continue to contact one another like a zipper, starting from the top edge downwards. This process allows the bentonite suspension to flow in relatively slowly through open gaps, unlike water.
  • the height difference required for the closing movement between the bentonite suspension levels in the housing and outside the housing can be easily produced using commercially available pumps.
  • 0.3 m may already be sufficient.
  • the pump required to generate the height difference should not be immersed more than 1 m in the bentonite suspension in the housing.
  • the closing movement of the housing can also be supported by electromagnets or can be carried out using the electromagnets alone.
  • electromagnets there are electromagnets in the side cheeks of the housings, which seal the sealing sheets between them. It is advantageous if the electromagnets reach up to the sealing membrane. Then the force required to attract the opposite housing part is smaller due to the smaller gap width than with a magnet arrangement on the side cheek on the side facing away from the sealing membrane.
  • the electromagnets can be arranged in a pump shape in a uniform distribution along the length of the side cheeks of the housing. A linear or rod-shaped magnet arrangement can also be considered.
  • the electromagnets individually or in succession. I.e. As soon as the gap between the side cheeks of the housing that forms the sealing surfaces is closed on a magnet, the power supply to this magnet is either completely switched off or throttled and at the same time the next magnet is activated, in which there is still a gap between the sealing surfaces of the side cheeks.
  • the magnets are individually provided with a power supply.
  • the sealing surfaces are designed so wide that the sealing surfaces come into contact with one another despite the shift in position.
  • the sealing surfaces can also be narrow.
  • a centering of the housing parts is then additionally provided in order to ensure that the housing parts are placed precisely against one another. The centering can be achieved, for example, by a clever shaping of the side cheeks. Such a shape is created with bead-shaped deformation in the area of the side cheeks. The bead-shaped deformation causes the housing parts to self-center. When placed against one another, the housing half is then guided with a bulge in a corresponding recess in the other housing half.
  • the webs are e.g. B. welded.
  • the housing parts can form part of the device provided for lowering the sealing sheets.
  • the housing parts then preferably form the side bolsters of the lowering device.
  • the housing parts are forcibly positioned together with the sealing sheets. I.e. the housing parts are inserted together with the waterproofing membrane. This is done by pulling the waterproofing membrane from a roll that is set up next to the earth slot and with the help of a crane that lowers the lowering device into the bentonite suspension.
  • the lowering device is assembled in sections. After the section of the lowering device forming the lower part has been immersed in the bentonite suspension, the subsequent section is assembled with the housing sections forming the side cheeks of the device. Then lowering continues until this section of the lowering device is also immersed in the bentonite suspension. The immersion is followed by the assembly of the next section of the lowering device and its immersion. This continues until the lowering device has reached the bottom of the earth slot.
  • the earth slot is finished with a length corresponding to the length of the waterproofing membrane and the waterproofing membranes are laid parallel to the earth slot so that they overlap at the edges.
  • the sealing sheets are then welded together outside the earth slot.
  • Test seams can be welded easily. Test seams are parallel weld seams in the overlap area of the webs. There is a channel between the parallel weld seams, which shows that the weld seams are tight by holding a pressurized air. A normal air pressure is 2 bar.
  • the sealing tarpaulin thus created is moved into the earth slot transversely to the longitudinal direction of the individual sealing sheets. This happens in sections Welding a new waterproofing membrane.
  • the resulting seal When lowering, the resulting seal is resiliently switched on the edge facing away from the earth slot. This ensures that the seal does not sink into the earth slot in an unforeseen manner.
  • the weld seam is placed at a slight distance from the edge of each sealing membrane. 20 mm free edge strips of a waterproofing membrane can be sufficient for a bracket.
  • the ends of the plastic seal are welded to one another in such a way that the ends are exposed, possibly cleaned and then welded to one another with conventional welding equipment to produce a standing seam or an overlap seam.
  • Overlap seams are an advantage.
  • the handling according to the invention is for long seals, for. B. 60 m long seals or much longer seals is an advantage.
  • a crossmember is attached to the lower edge of the seal in a manner known per se.
  • the traverse can be in one piece, can also be composed of several elements.
  • the modular design is advantageous if there are different diaphragm wall lengths.
  • the crosshead is so heavy that a lowering of the plastic seal in the bentonite is guaranteed.
  • the traverse with at least two traction means for. B. ropes or chains, which can be moved independently and together. This allows the lowering movement of the crossbeam to be controlled.
  • a control in the longitudinal direction of the plastic seal or in the longitudinal direction of the earth slot is preferably additionally provided.
  • This control option consists of diagonally acting traction devices. With these diagonally acting traction devices, optionally again ropes or chains, any deviation of the vertical sealing membrane edge from the predetermined edge position can be prevented.
  • the web ends are received by a housing when lowering.
  • the housing is filled with bentonite.
  • the slot in the housing that surrounds the plastic seal is closed.
  • the application of hydraulic fluid is of particular advantage. Only a little pressure is required. The pressure applied to the top of the housing or the pressure applied to the hose continues as a pressure difference down to the bottom. The same contact conditions arise everywhere, unlike when air pressure is applied.
  • the housing can be removed after welding. However, the housing can also remain as an inspection shaft.
  • a welding platform is provided for carrying out the diaphragm wall sealing according to the invention, on which the welding of the sealing sheets laid parallel to the diaphragm wall takes place.
  • the welding platform ensures that the sealing sheets do not become dirty at the welding points.
  • Tie rods and pliers are used to capture the web edges outside the earth slot.
  • the welding platform preferably has recesses for the tie rods, so that the devices used for welding the sealing sheets do not find any resistance on the protruding tie rods.
  • the main advantages of the invention are: - Welding processes outside the earth slot - Ability to test the welds outside the earth slot - considerable savings in working hours. While the experts for the laying of the waterproofing membranes have to be present during the pulling-in of the waterproofing membranes in their longitudinal direction - i.e. when creating a diaphragm wall in sections - for the entire duration of the manufacture of the diaphragm wall and the sealing, the presence of the laying experts in the method according to the invention can be a fraction of that Limit time, ie no installation specialist is required for the waterproofing membrane during the creation of the earth slot. - The laying method according to the invention also enables the use of pre-welded sealing sheets.
  • FIG. 1 denotes an earth slot 400 mm wide.
  • the earth slot 1 is 30 m deep.
  • the earth slit 1 has been produced while backfilling with bentonite sludge.
  • sealing sheets 2 and 3 After completion of the earth slot 1 1 sealing sheets 2 and 3 have been lowered into the earth slot. The sealing sheets 2 and 3 have been lowered so that they overlap one another at the edge.
  • housing halves 4 and 5 are provided which span the overlap area.
  • the housing halves 4 and 5 have seals 6 at the point of contact with the sealing sheets 2 and 3.
  • the housing halves 4 and 5 consist of U-shaped steel profiles, which together form a cavity of 200 mm x 200 mm.
  • the cavity is sufficient to insert a suction line into the housing and to generate a sudden vacuum in the interior of the housing while applying high suction power.
  • the excess pressure that arises outside the housing interior causes the housing halves to be placed against the sealing sheets 2 and 3.
  • the housing interior can be pumped empty.
  • the waterproofing membranes in the overlap area are rinsed with water, the rinsing water is pumped out and a conventional welding device with forward and reverse running is attached from above.
  • the welding device first moves to the bottom of the slot. There the welding device is given contact to retract a heating wedge. You can also choose to weld with hot air.
  • the welding process starts with reverse running at the same time. Then the overlap area is closed from bottom to top. At the same time, the weld seam is checked with ultrasound. This is done using a test head attached to the welding device. The test head is located behind the welding device in the welding direction.
  • Hoses 6 and 7 are mounted on the side walls 14.
  • the hoses 6 and 7 are made of rubber-coated fabric.
  • the tubes 6 and 7 can, for. B. with terminal strips on the side walls 14.
  • the tubes 6 and 7 are clamped between the terminal strips and the side walls 14.
  • the clamping strips allow the use of cuts which are only formed during assembly on the side cheeks 14 by folding and clamping into tubes.
  • the diameter of the hoses 6 and 7 is such that the sum of the diameters is 1.5 times and the distance between the earth slot walls 1.
  • the tubes 6 and 7 are closed at the base 15. This can be done by clamping.
  • a clamping of the tubes 6 and 7 is also provided at the upper end.
  • a valve for filling hoses 6 and 7 with hydraulic fluid is also integrated in the clamp. When the hydraulic fluid is pumped in, the hoses 6 and 7 bulge, press against the earth slot walls 1 and clamp the sealing membrane 5 and the side walls 14 of the housing halves 9 and 10 between them.
  • the hoses 6 and 7 overlap with respect to the housing halves 9 and 10 or the side cheeks 14, so that the space 2 of the earth slot is sealed off with respect to the housing halves 9 and 10 and the overlap region 15.
  • bentonite suspension was also filled into the earth slot.
  • the bentonite suspension has been mixed with cement, so that one in area 2 of the earth slot Consolidation occurs.
  • the earth slot is made in sections.
  • the earth slot was excavated to a length, the boundary of which is shown in dash-dot lines at 17 in FIG. This boundary lies in the earth slot area 3.
  • the sealing membrane 105 has been introduced.
  • the housing halves 9 and 10 with the hoses 6 and 7 have been lowered on both sides of the sealing membrane 105.
  • a retarder is injected into the bentonite suspension, which is located in the area of the earth slot from the hoses 6 and 7 to the boundary 17. The retarder prevents the bentonite suspension from solidifying.
  • the interior of the housing 9, 10 is pumped empty.
  • a submersible pump is suitable for this, which is placed on the suspension level in the housing and dips into the bentonite suspension with its suction pipe and has only a short suction path for the bentonite suspension. The pump then presses the bentonite suspension through a pipe into a collecting container.
  • pumping out the housing 9, 10 after reaching a height difference of 0.4 m between the suspension level inside the housing and outside the housing 9, 10 causes the housing halves 9 and 10 to be pressed against one another by the suspension pressure.
  • the housing halves 9 and 10 close the sealing sheets 104 and 105 sealing between them.
  • the sealing membrane 4 has been lowered into the earth slot after the completion of the earth slot section for the area 3 before the start of the pumping process.
  • the sealing strips 104 and 105 advantageously also form seals for the housing 9 and 10.
  • the housing 9 and 10 is closed at the base 12.
  • the housing halves 9 and 10 are provided with a base plate.
  • the overlapping web edges are rinsed with water.
  • the water is pumped out by the pump that is still on the base of the housing.
  • a welding device is then attached to the top of the sealing sheets 104 and 105, which surrounds the overlapping sheet edges with guide rollers and is first moved to the foot of the housing by a drive roller before the welding process is started.
  • the device then welds the overlapping web edges together on their way back upwards.
  • Commercially available welding devices are suitable for this welding process, as are customary for overlapping seams on sealing baskets on roofs.
  • the housing 9, 10 is again flooded with suspension, the hoses 6 and 7 are relieved.
  • the housing halves 9 and 10 can be pulled out of the earth slot again after the relief.
  • Figure 3 shows a housing for earth slots with special depth.
  • the housing consists of sections 20 which are provided with collars 21 at their contact points and are screwed together there.
  • quick fasteners e.g. B. with clamping levers can be used.
  • FIGS. 4 and 5 show housing sections 25 with side cheeks 26.
  • the side cheeks 26 are provided with bores for magnets 27.
  • the magnets are arranged evenly distributed over the length of the side cheeks 26.
  • the magnets 27 can be supplied with current via lines 28.
  • the magnets 26 can be controlled individually. This serves to support the closing movement of the housing halves in a further exemplary embodiment of the invention.
  • the magnets 27 arranged on the housing section 25 attract the opposite housing section made of steel.
  • FIG. 6 shows, in a further exemplary embodiment, self-centering housing halves 30 and 31.
  • the housing halves 30 and 31 have side cheeks 32 and 33.
  • the side cheeks 32 are provided with bead-shaped bulges 34, the side cheeks 33 with inward bulges 35.
  • the bulges 34 and 35 are shaped in such a way that that they close together.
  • the sealing clamped between the housing halves 30 and 31 in the exemplary embodiment according to FIG. 6 tracks are labeled 36 and 37.
  • the advantage of the bulges 34 and inward bulges 35 lies in the centering or guiding of the housing halves 30 and 31 when the housing is closed.
  • FIG. 7 shows an exemplary embodiment of the invention with a sealing membrane 40 and housing halves 41 which are provided with side cheeks 42, the sealing membrane 40 being provided with a welded-on web 43.
  • the web 43 slides in a groove 44 in the side cheek 42.
  • the web has a height of 10 mm in the exemplary embodiment.
  • the groove 44 is created by bending the side cheek 42 or by a suitable welded construction.
  • the web 43 and the groove 44 form a guide for the web 40.
  • FIG. 8 shows an earth slot with slot walls 50 and 51.
  • the bentonite suspension has already been solidified by admixed cement. While in area 53 the solidified bentonite suspension has not yet solidified.
  • hoses have been used to delimit the regions 52 and 53. The hoses are shown in dash-dot lines in FIG. 8 and designated 54.
  • the tubes 54 are fastened to the housing halves 55 and 56, which in addition to the side cheeks 57 also have guides 58.
  • the guides 58 are each formed by a side wall and a web 59 and bends 60 at the end of the web 59 or at the end of the associated side wall 57.
  • This part of the lowering device is designated by 62 and is provided on the side of the sealing sheet with a sheet-shaped or 63-shaped support 63 for the sealing sheet.
  • the edition is shown in Figure 9. It can also be seen from FIG. 9 that the device for lowering the sealing membrane has a clamping bar 64 at the foot. The terminal block 64 is actuated electromechanically and clamps the lower edge of the sealing sheet to be drawn in.
  • the part 62 consists of a lattice construction, which is optionally stiffened by diagonally extending struts.
  • the earth slot in area 52 has been completed with a sealing sheet 65.
  • the housing halves 55 and 56 are open, so that the sealing sheet designated 66 can be lowered with the lowering device.
  • the head 61 slides in the guide 58, while the support 63 with the clamping device 64 is threaded with the sealing membrane between the two housing halves 55 and 56.
  • the sealing membrane 66 reaches its predetermined position. This can cause a shift in the housing half 55 can be prevented by the tubes 54.
  • the lowering process with part 62 also lowers the housing half 55 for the next overlap area.
  • the housing half 55 for the next overlap area is screwed or clamped to the part 62 in a manner not shown.
  • the interior of the housing 55, 56 is pumped empty and the sealing webs 65 and 66 are welded in their overlap area as in the exemplary embodiment according to FIGS. 1 and 2. Then the housing 55, 56 is flooded with bentonite suspension and the part 62 with the housing half 55 of the just welded overlap area is pulled out of the earth slot, while the housing half 55 remains in the earth slot for the overlap area to be subsequently welded by loosening the previously provided screw connection or clamping connection. In contrast, the housing 55 of the just welded overlap area is screwed or clamped to the part 62 for extraction.
  • the housing half 56 opposite the housing half 55 is pulled out either together with the part 62 and the housing half 55 or separately.
  • the sealing sheet 66 When the sealing sheet 66 is introduced, the sealing sheet 66 is pulled from a roller which has been set up on the side 67 of the earth slot.
  • the membrane roll is arranged on the side 68.
  • Part 62 is used again, but in a position pivoted by 180 degrees, which is denoted by dashed lines in FIG.
  • the housing parts 170 and 171 are lowered into the earth slot before the sealing sheets are lowered. I.e. the sealing sheets are then drawn in between the housing parts 170 and 171.
  • the prerequisite is that the housing parts release a sufficient gap.
  • the gap width must be at least equal to the thickness of the waterproofing membrane.
  • the gap width is preferably substantially larger.
  • the housing parts 170 and 171 are held at the bottom by bolts 176.
  • the bolts give the housing parts 170 and 171 sufficient play and are loosened before the housing parts 170 and 171 are pulled out after the overlapping web edges have been welded together.
  • the housing parts 170 and 171 are composed of folded profiles 172 and 173 and floor plates 174 and 175.
  • FIG. 13 shows an earth slot 201 which with the help of an excavator over its entire length, for. B. 60 m has been created.
  • bentonite sludge was filled in at the same time.
  • the bentonite mud secures the earth slot against the breaking out of soil.
  • a welding platform 202 has been arranged on one side of the earth slot.
  • the welding platform 202 extends along the earth slot 201.
  • the sealing sheets designated 103 and 104 are laid parallel to the earth slot 201 and welded to one another in the overlap region 115.
  • a test seam is used here.
  • the test seam consists of two parallel welded seams.
  • the distance between the weld seams is 10 mm in the exemplary embodiment.
  • the channel formed in this way is pressurized with compressed air after the creation of a weld. This happens with the channel ends locked. If there is no pressure drop, the weld seam can be assumed to be sufficiently tight.
  • the test pressure is 2 bar in the exemplary embodiment
  • the plastic seal created by welding the sealing sheets 103 and 104 is lowered into the bentonite slurry denoted by 7 with one end to which a cross member 206 is attached.
  • the Traversw 206 which is composed of individual steel girders, is held at intervals by pulling cables 208 by construction cranes or suitable trestles and winches.
  • the construction cranes or trestles and winches have separately controllable drives, so that a desired inclination position of the traverse 206 or horizontal position can be maintained when lowering.
  • two pull cables 209 prevent the seal from evading in the longitudinal direction of the earth slot 201.
  • the pull cables 209 engage the cross member 206 in the end region and run diagonally or obliquely to the earth slot and to one another in a crosswise manner.
  • Two suitable winches interact with the pulling ropes 209.
  • the desired position of the traverse or the lower sealing edge or the lateral sealing edges can be checked with rods which are inserted into one another as the lowering movement progresses, so that as the lowering movement progresses they indicate the position of the traverse 206 with their part protruding from the earth slot and the bentonite sludge.
  • These linkages can also be used to release the cross-member from the lower edge of the seal after the seal has been successfully lowered so that the cross-member 206 can be recovered.
  • the traverse 206 optionally has a clamping device for the lower sealing edge.
  • a lost traverse 206 is also optionally used, i. H. After successful lowering, the traverse 206 remains in the earth slot 201.
  • the edge of the finished seal facing away from the earth slot 201 is held by pliers 210 and tie rods 211.
  • the pliers 210 grip on a free web edge 212 protruding in the exemplary embodiment when the overlap seam is created.
  • the web edge has a width of 30 mm in the exemplary embodiment.
  • the welding platform 202 is provided with recesses for the tie rods 211.
  • the sealing sheets laid on the welding platform 202 can also lie smoothly in the area of the tie rods and do not form an obstacle for the welding devices.
  • a web edge is always held by pliers 210.
  • the webs 103 and 104 have been welded to a further web 13 in the form described above, the free edge of the web 13 is gripped by pliers 210 shown in broken lines before the pliers 210 comprising the web edge 212 are released will.
  • the various tie rods 211 are operated via suitable winches 214.
  • a contaminated soil region 216 is to be encapsulated with the seal designated 215 in FIG.
  • the earth slot 201 extends beyond the contaminated area 216 into a water-impermeable layer of earth.
  • the projection 217 of the earth slot 201 is 2 m. Such a supernatant ensures that contaminated water does not penetrate through the bentonite layer and under the lower edge of the seal 215.
  • FIG. 16 shows the connection of two mutually abutting earth slots 220 and 221.
  • a housing 222 composed of sections is provided in the ground.
  • the housing 222 has openings 223 and 224 to the earth slots 220 and 221, which allow the seal 215 to be inserted easily. If both earth slots 220 and 221 are provided with a seal 215, the openings 223 and 224 are closed. This is done with the help of hoses 225 and 226. A hose is provided at each opening.
  • the hose is attached to the lower end of the lower section of the housing 222 and is closed there at the bottom. With the progressive lowering movement of the housing sections, the hose is pulled downward.
  • the hoses 225 and 226 are pressurized with pressurized water.
  • a liquid pressure of 1 bar is sufficient, which causes the hoses 225 and 226 to bulge.
  • the seals 215 are pressed against abutments 227 and 228, so that a seal is formed at the openings 223 and 224.
  • the fluid pressure of 1 bar applied above acts as a pressure difference to the ambient pressure even at the lowest housing section.
  • the housing 222 After sealing, the housing 222 is emptied with a pump, not shown. Then the ends projecting into the housing 222 can be cleaned and z. B. are connected to each other with an overlap seam. After the welding thus provided, the housing 222 can be filled with bentonite again and removed after opening the openings 223 and 224.

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EP88107391A 1987-05-29 1988-05-07 Méthode pour souder des membranes imperméables dans des murs enterrés Expired - Lifetime EP0292765B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88107391T ATE94240T1 (de) 1987-05-29 1988-05-07 Verfahren zum verschweissen von abdichtungsbahnen in schlitzwaenden.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19873717999 DE3717999A1 (de) 1987-05-29 1987-05-29 Verfahren zum verschweissen von abdichtungsbahnen in schlitzwaenden
DE3717999 1987-05-29
DE19873720670 DE3720670A1 (de) 1987-05-29 1987-06-23 Verfahren und vorrichtung zum ueberlappenden schweissen von abdichtungsbahnen in erdschlitzen
DE3720670 1987-06-23

Publications (2)

Publication Number Publication Date
EP0292765A1 true EP0292765A1 (fr) 1988-11-30
EP0292765B1 EP0292765B1 (fr) 1993-09-08

Family

ID=25856103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88107391A Expired - Lifetime EP0292765B1 (fr) 1987-05-29 1988-05-07 Méthode pour souder des membranes imperméables dans des murs enterrés

Country Status (4)

Country Link
US (1) US4900195A (fr)
EP (1) EP0292765B1 (fr)
JP (1) JPS646417A (fr)
DE (2) DE3720670A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990014214A2 (fr) * 1989-05-24 1990-11-29 Sarna Kunststoff Ag Boitier de protection
EP0416199A1 (fr) * 1989-09-07 1991-03-13 Hüls Troisdorf Aktiengesellschaft Procédé pour la fabrication d'un espace creux

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3825728A1 (de) * 1988-07-28 1990-02-01 Bauer Spezialtiefbau Verfahren zum entleeren einer fuehrung fuer eine membran und vorrichtung zur durchfuehrung des verfahrens
GB2258486A (en) * 1991-06-27 1993-02-10 Keller Ltd A panel for a subsurface barrier screen
DE4213585A1 (de) * 1992-04-24 1993-10-28 Siemens Ag Überwachungseinrichtung für eine Mülldeponie und Verfahren zur Leckageortung
NL1015163C2 (nl) * 2000-05-12 2001-11-15 Hollandsche Betongroep Nv Werkwijze voor het aanbrengen van een scherm in de grond.
CN109252532B (zh) * 2018-08-09 2021-08-31 贾秀堃 一种地下连续墙端头用可伸缩封头箱
CN110424433A (zh) * 2019-07-12 2019-11-08 广州穗岩土木科技股份有限公司 一种地下连续墙接头柔性止水带安装装置及方法

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DE1060329B (de) * 1957-08-09 1959-06-25 Lippeverband Verfahren und Vorrichtung zum Einbau von Dichtungsbahnen oder nicht rammfesten Dichtungsplatten als Abdichtungsschuerzen od. dgl. in den Untergrund oder in Daemme
DE3428297A1 (de) * 1984-08-01 1986-02-27 Ed. Züblin AG, 7000 Stuttgart Verfahren zur verbindung von membranen in schlitzwaenden und vorrichtungen zur durchfuehrung des verfahrens
DE3444690A1 (de) * 1984-12-07 1986-06-12 Ed. Züblin AG, 7000 Stuttgart Verfahren und vorrichtung zum einbringen von paneelen in schlitzwaende

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US4100391A (en) * 1976-09-13 1978-07-11 Progressive Machinery Corporation Portable seam welder
JPS53142286A (en) * 1977-05-18 1978-12-11 Toshiba Corp Automatic ultrasonic inspector
US4696607A (en) * 1980-07-30 1987-09-29 Finic, B.V. Slurry trench method and apparatus for constructing underground walls
NL191153C (nl) * 1981-09-15 1995-02-16 Stevin Volker Beton Water Werkwijze voor het vervaardigen van een de stroming van grondwater beperkend scherm in de grond alsmede vel en lans voor toepassing bij deze werkwijze.
JPS5960257A (ja) * 1982-09-29 1984-04-06 Hitachi Ltd 配管検査用の無軌道式配管走査装置
US4519729A (en) * 1983-05-10 1985-05-28 Schlegel Corporation Segmented membrane barrier
NL8301918A (nl) * 1983-05-31 1984-12-17 Nico Gerhard Cortlever Damwand vormende een waterdicht scherm in de grond en werkwijze voor het aanbrengen daarvan.
DE3424821A1 (de) * 1984-07-06 1986-01-16 Niederberg-Chemie GmbH, 4133 Neukirchen-Vluyn Erdschlitze
DE3540270A1 (de) * 1985-11-13 1987-05-14 Wayss & Freytag Ag Verfahren zur herstellung einer dichtwand und vorrichtung zur durchfuehrung des verfahrens
DE3712722A1 (de) * 1987-04-15 1988-11-10 Niederberg Chemie Herstellung einer schlitzwandabdichtung

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
DE1060329B (de) * 1957-08-09 1959-06-25 Lippeverband Verfahren und Vorrichtung zum Einbau von Dichtungsbahnen oder nicht rammfesten Dichtungsplatten als Abdichtungsschuerzen od. dgl. in den Untergrund oder in Daemme
DE3428297A1 (de) * 1984-08-01 1986-02-27 Ed. Züblin AG, 7000 Stuttgart Verfahren zur verbindung von membranen in schlitzwaenden und vorrichtungen zur durchfuehrung des verfahrens
DE3444690A1 (de) * 1984-12-07 1986-06-12 Ed. Züblin AG, 7000 Stuttgart Verfahren und vorrichtung zum einbringen von paneelen in schlitzwaende

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990014214A2 (fr) * 1989-05-24 1990-11-29 Sarna Kunststoff Ag Boitier de protection
WO1990014214A3 (fr) * 1989-05-24 1990-12-27 Sarna Kunststoff Ag Boitier de protection
EP0416199A1 (fr) * 1989-09-07 1991-03-13 Hüls Troisdorf Aktiengesellschaft Procédé pour la fabrication d'un espace creux

Also Published As

Publication number Publication date
DE3720670A1 (de) 1989-01-12
JPS646417A (en) 1989-01-11
US4900195A (en) 1990-02-13
EP0292765B1 (fr) 1993-09-08
DE3883845D1 (de) 1993-10-14

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