EP0725195B1 - Process for erecting concrete walls by means of braced shutterings - Google Patents

Abstract

The tensioning anchors hold the shuttering plates at a spacing, corresp. to the required wall thickness. After concrete casting, the anchors are removed. There are tubes, serving to the anchor expansion, remaining in the concrete wall for sealing the expansion points, after filling with cast material. Prior to filling of the tubes, via their apertures, into the cavities between the tube outside and the adjacent concrete wall material is injected required casting material.

Description

The invention relates to a method for establishing a Concrete wall using braced formwork according to the preamble of claim 1.

The generic method is used to establish Concrete walls. The formwork panels with a corresponding to the thickness of the concrete wall to be erected Distance arranged parallel to each other. For the Positional fixation and bracing of the formwork panels tension anchors are used, whereby as Formwork spacers and counter anchor elements pipes, so-called Pipe spreaders are used by the tension anchors be enforced and become so-called cone-shaped Dents on the inside of the formwork panels support. The bracing of the formwork panels against each other with outside the formwork on the Ends of the tension anchors screw-on screw elements, such as for example, large wing screws. The Formwork arrangement prepared in this way will then be on site poured with concrete.

After the concrete has hardened, the formwork panels removed by first screwing on the Unscrewed anchor ends and then the anchor are pulled out of the pipes or pipe spreaders. To the formwork is folded down from the concrete wall the conical dents removed from the pipe ends, while the pipe spreads as lost parts within the Concrete wall remain, which is therefore due to the tube spreads left multiple times is perforated. These wall passages are with Potting material, for example with special Swelling grout, backfilled. The backfilling takes place conventionally in that the pipe struts on one End is closed with a lid while from the the other side of the pipe with a filling syringe is introduced. The end cover has a perforation so that displaced air can escape can. After potting the wall passages is the Concrete wall completed, assuming that the Concrete wall not only in the undisturbed wall area, but also is watertight even in the disturbed pipe spreader area.

From US-A-3 064 707, in particular Fign. 1 to 4 are T-shaped Pipes consisting of a larger pipe section Diameter and a smaller in diameter Pipe section, which is larger with the pipe section Diameter is known.

The present invention is based on the object Method of erecting concrete walls using To create formwork of the type mentioned at the outset which the pipe spreaders or with potting material pressing sealing devices are simply pressed can.

These tasks are solved by a procedure with the characteristics of Claim 1. Advantageous further developments of the invention are characterized in the dependent claims.

With the method according to the invention, several Pipe spreaders at the same time or one pipe spreaders and one on known sealing device with potting material be pressed. You only have to do this at a single point the potting material are introduced, which is the Pressing with potting material considerably simplified and is inexpensive to carry out.

A preferred device for performing the The method according to the invention comprises one in the pipe strut insertable injection device in the manner of a so-called. Packers, who has an injection tube, the jacket with Injection openings or injection nozzles is provided. The Injection tube is sealed on both sides. The radial one sealing and tensioning of the packer on both sides Creation of a sealed injection area in the Pipe spreader is e.g. with rubber cuffs on the Injection tube.

The potting material is supplied to the packer via lines from a Storage container fed under pressure, being basically the same potting material is used that for subsequent potting of the pipe interior is used. Swelling grout is usually a mixture of Portland cement, finely graded quartz sand and reactive chemical additives that have the desired swelling effect provide.

A sealing device is described, for example, in EP-A1 0 418 699. It is a Passage as an injection route for a sealing medium forming body in the joint area on the concrete surface of the a concreting section, from which after the second concreting section during an injection of the Sealant in the body of this in defects of the Concrete in the joint area between the two concreting jobs exit. The bodies are channel-like structures, as in EP-A1-0 418 699, or porous Hoses according to CH-A-600 077, according to DE-U-83 35 231 Can have support bodies in the form of a helical spring, or according to DE-U-86 08 396 a sealing device in Form of an injection hose can be the one hand the disadvantage of positioning the hose by am Fix the lugs provided on the hose body and on the other hand a predetermined breaking point in the longitudinal direction of the hose-like Identify body through which the sealing medium in the Concrete should leak. The sealing medium is usually direct pressed into the beginning or end of the hose. The beginning and end of the hose must follow Conclusion of the concrete measures in the joint area from the outside be freely accessible. In this case, the concrete formwork Have recesses for the hose ends, their assembly the formwork difficult. In EP-A1-0 418 699 is proposed in this context, that in this Document described channel after hardening and Stripping the second concreting section with a Drill a hole in the hardened concrete and through the Drill the sealant inside the Press sealing device. After another Proposal should be at the locations where the hole to be brought down, the channel with a larger one Be hollow, so that the bringing down drilling easier and hitting the canal safer can be done. According to the present invention Method for loading such sealing devices simplified with sealing material in that the pipe spreads already on the concrete wall be used. It is therefore no longer necessary Drilling concrete from the outside or special facilities create the end or the beginning of a Injection hose or injection channel to the outside to be led.

Fig. 1

einen Querschnitt durch einen Verschalungsaufbau zur Errichtung einer Betonwand unter Verwendung einer Rohrspreize, die an ein Injektionssystem angeschlossen ist;

Fig. 2

eine perspektivische Darstellung einer Ausführungsform der Rohrspreize;

Fig. 3

einen Querschnitt durch die mit dem Verschalungsaufbau nach Fig. 1 errichtete Betonwand nach Abschlagen der Verschalung;

Fig. 4

einen Querschnitt durch eine Betonwand im Spannstellenbereich nach Abschlagen der Verschalung, mit einem in der Rohrspreize angeordneten Packer zum Zuführen von Vergußmaterial;

Fig. 5

eine bevorzugte Ausführungsform eines verwendeten Injektionspackers zum Zuführen von Vergußmaterial in die Rohrspreize.

The invention is explained in more detail below with the aid of the drawings. Show it:

Fig. 1

a cross section through a formwork structure for erecting a concrete wall using a pipe spreader that is connected to an injection system;

Fig. 2

a perspective view of an embodiment of the pipe spreader;

Fig. 3

a cross section through the concrete wall erected with the formwork structure of Figure 1 after knocking off the formwork.

Fig. 4

a cross section through a concrete wall in the tensioning area after knocking off the formwork, with a packer arranged in the pipe spreader for feeding potting material;

Fig. 5

a preferred embodiment of an injection packer used for feeding potting material into the pipe spreader.

Fig. 1 shows the section of a formwork Erection of a concrete wall before filling Liquid concrete. The formwork has two Formwork panels 1 and 2 with anchors are equipped and kept at the same distance from each other become. The anchorages each have a tension anchor 3, e.g. in the form of an end with one Threaded steel rod, on. Between Formwork panels 1 and 2 is a tensioning tube or a pipe spreader 40 arranged with the on the inner surfaces of the formwork panels 1 and 2 adjacent, in the Openings of the pipe spreader 40 seated conical dimples 5 and 5a is equipped. The dents 5, 5a with a Full face on the inner surfaces of the Formwork panels 1 and 2 are supported, extend with the other ends into the pipe spreader 40 and have through bores that extend from the tension anchor 3 be penetrated, which also the pipe braces 40 and one hole each in the formwork panels 1, 2 enforced. The anchor is braced with Wing screws 6 and 7, which on the end on the Anchor 3 provided threads are screwed on and over large washers 8 and 9 on the Act shuttering panels 1 and 2.

The formwork so tensioned is conventionally used Poured liquid concrete. After the concrete has hardened the shuttering plates 1 and 2 knocked off, before the tension anchor 3 together with the tension screws 6, 7 and the washers 8, 9 is removed. Thereupon the dents 5 and 5a pulled out of the concrete wall 20; the pipes 40a remain as lost parts within the concrete wall 20. The finished concrete wall 20 is in the area lost pipe spreader 40 shown in Fig. 3.

The pipe wall of the clamping point pipe or the pipe strut 40 is in particular in its longitudinal center area with a Multitude of passes e.g. in the form of holes 11 breached. The holes 11 are with a cuff 12 covered that on the longitudinal center region of the tube 40a is raised and has a length that ensures that all passages 11 are closed. Due to the Using the sleeve 12, the pipe spreader 40 install and use in a conventional manner because the Cuff penetration of liquid concrete into the Passages 11 reliably prevented.

Fig. 2 shows a pipe spreader 40. Die The use of this pipe spreader 40 according to the invention is in 1 and 3.

There is a radial on the pipe spreader 40 or on the pipe 40a protruding pipe socket 41 attached, the smaller one Diameter than the tube 40a, fixed with this is connected and flows into this.

As a spacer for the two formwork panels 1 and 2 at a certain point is that in FIG. 2 shown pipe spreader 40 installed with nozzle 41, wherein the pipe 40a via dents 5 and 5a on the inside of the Formwork panels 1 and 2 is supported. As Clamping means serve the tension anchor 3, the wing screws 6, 7 and the washers 8 and 9. On the down from Pipe stub 41 projecting from pipe 40a is a hose 42 attached to an injection channel 43 one per se sealing device 43a known from EP-A1-0 418 699 is connected, which is U-shaped in cross section is parallel to the formwork panels 1 and 2 e.g. extends in its entire length and with its Sidewalls on a concrete plate 44 stands up. Instead of of the channel 43 can also be other known per se Injection routes in the same way with the pipe socket 41 be associated.

In Fig. 3 the concrete wall 20 is shown, which after Filling concrete into the casing shown in Fig. 1, after the concrete has hardened and after the Formwork panels 1 and 2 have emerged after previously the tension anchor 3 together with the tension screws 6, 7 and washers 8 and 9 and dents 5 and 5a have been removed. As lost parts remain in the concrete wall 20 an upper pipe 40a, the lower pipe 40a, the connecting hose 42 and the injection channel 43.

Before filling the passages into the concrete wall 20, the through which pipes 40a are formed, with concrete for example by means of an injection packer sealing medium via slots or openings 11 in the tubes 40a in Cavities and cracks introduced outside the tubes 40a.

According to the invention is due to the transmission link of the pipe 40a with the injection channel 43 via the Pipe socket 41 and the connecting hose 42 a Sealing imperfections in the concrete in the joint area 45 between the bottom surface of the wall 20 and the surface of the Concrete slab 44 reached by using sealing medium or Potting material that is introduced into the pipe 40a over the pipe socket 41 and the connecting hose 42 in the Injection channel 43, which is completely under pressure standing potting material or sealing medium is filled, that over the free longitudinal edges of the channel 43 in the Joint area 45 and possibly in cracks or cavities can emerge between the concrete wall 20 and the Outside area of the injection channel 43 are present.

For introducing the sealing medium or the potting material is removed after dismantling the formwork and exposing the lost pipe 40a into pipe 40a Injection device in the manner of a packer 10 introduced (Fig.4). The injection device has a tube 13, breakthroughs in the pipe jacket in the form of e.g. Holes 15 are introduced and the outer diameter is smaller than the inner diameter of the lost pipe 40a so that an annular cylindrical space 13a between the Packer tube 13 and the lost tube 40a is formed. The packer 10 is with its tube 13 in the Cuff area of the pipe spreader 40 introduced. The end of the packer tube 13 is through circular disks 13b completed, the diameter of the inner diameter of the lost pipe 40a corresponds. Outside on the disks 13b are e.g. cylindrical sealing plug 16 from one elastic material attached. One sealing plug 16 has a central passage with a Passage in the adjacent disk 13b is aligned, whereby a hose 14 at the passage of the sealing plug 16 connected. The two sealing plugs 16 are in radial direction for bracing against the inner wall of the Expandable tube 40a. The sealing plugs are for this purpose 16, for example, formed like a balloon, wherein them a hose, not shown, compressed air can be supplied so that the sealing balloon in clamped in the radial direction against the inner wall of the tube becomes. Alternatively, the two sealing plugs 16 be cylindrical sealing washers, which by means of an axial acting compression device are acted upon, the compressed in the axial direction Sealing material in the radial direction evades and so that it is braced against the inner wall of the tube 40a. In any case, the compressed sealing plug 16 an end sealing of the pipe braces 40 is achieved.

Potting material is pressurized via the hose line 14 fed into the tube 13. Passed through the holes 15 Potting material for the pipe socket 41 of the pipe struts 40.

Following this process step, the packer 10 after relaxing the sealing plug 16 from the tube 40a pulled, and the pipe interior is conventionally e.g. with a known injection packer, with Potting material filled so that the concrete wall in the area the pipe spreader 40 is completely sealed.

The cuff 12 expediently has at least one Valve slot 12a, preferably a plurality of valve slots 12a on, which are preferably not arranged above a hole 11 be (Fig. 2). A plurality of slots 12a are preferred along an axially parallel generatrix of the sleeve 12, extending in the longitudinal direction, introduced in series. If - as shown - several holes 11 e.g. along a longitudinal line of the tube 40a arranged in series then the slots 12a are on another offset longitudinal jacket line in the cuff 12 arranged, the slots 12a also preferably not lie on the same circumferential line as openings 11, but preferably exactly between two neighboring ones Circumferential lines of the holes 11, the slots 12a are also arranged distributed on a circumferential line.

5 shows a further embodiment of a packer 50 for use in pipe spreaders, from which the pipe spreader 40 is shown in the the front part of the packer 50 is inserted and the in a concrete wall 20 sits (not shown).

The packer 50 has a nozzle tube 51, which is approximately extends over two thirds of the packer 50 and at the ends Has externally threaded sections 52 and 52a, of which the nozzle-side threaded portion 52 approximately over one Third of the nozzle tube 51 extends. A Nozzle head screw 53 has a through hole 54 same diameter as the inside diameter of the Rohres 51. A coaxial to the through hole 54 Blind hole 53a in the nozzle head screw 53 is with provided with an internal thread with which the screw 53 the end of the threaded section 52 is screwed on. Between the annular bottom of the blind hole 53 and an annular end face of the threaded portion 52 a sealing ring 52b is used. The location of the screw 53 on the threaded portion 52 is by a lock nut 57th secured with their internal thread on the Nozzle tube thread section 52 sits and with one Face the adjacent face of the Nozzle head screw 53 applied.

The nozzle head screw 53 also has one piece smaller diameter cylindrical socket 53b, the is provided with an external thread 53c. On the thread 53c is a valve coupling 55 with an internal thread screwed on with the outside at its free end a profile contour 56 is provided for the connection of a Hose coupling, not shown. The sealing seat of the Coupling 55 on thread 53c is through a Teflon tape ensures that that engages with each other stationary threads. In the interior 58 of the clutch 55 is a conical coil spring 59 coaxial to the longitudinal center of the nozzle tube 51 is arranged. The spring 59 is supported its larger diameter end on an annular disc 60, into an annular groove in the inner wall of the coupling 55 is inserted; the smaller diameter other end of the Spring 59 biases a ball 61 which as a valve the input of the clutch 55 below Spring preload closes.

There is also a cylindrical on the thread 52 Clamping nut 62, one end face 63 of which Front face of a cladding tube 64 abuts. Against the other annular end face 64a of the cladding tube 64 borders a first tensioning hose 65, which consists of an elastic Material, e.g. is made of plastic and the on the Outer lateral surface of the nozzle tube 51 is seated. A second same tensioning hose 66 sits at an axial distance from first tension hose 65 also on the nozzle tube 51 in front the thread 52a. Between the two hoses 65 and 66 is a further cladding tube section 67 on the nozzle tube 51 arranged the distance between the two tubes 65 and 66 sets and holes 68 in the jacket, which expediently aligned with holes 69 in the nozzle tube 51 are arranged.

On the thread 52a of the nozzle tube 51 is one cylindrical cap 70 screwed with her annular end edge 71 against that edge adjacent annular end edge of the second Tension hose 66 butts and the passage 51a of the Nozzle tube 51 closes.

The injection packer 50 is the same except for the parts Cladding tube section 67, second tensioning hose 66 and flap 70 a known for filling pipe spreaders used injection packer. It is axial with its spaced tension hoses 65 and 66 within the Pipe spreader 40 arranged.

The outer diameter of the cladding tube section 67 is smaller than the inside diameter of the pipe struts 40, so that a annular cylindrical space 72 is formed, the is sealed by the tensioning hoses 65 and 66 Tensioning hoses 65 and 66 are made by moving the Thicken the clamping nut 62 in the axial direction themselves in the radial direction and are against the inner wall the pipe strut 40 pressed. With this rotation the Clamping nut 62 forms the cap 70 a counter bearing for the Movement of the cladding tubes 64 and 67 as well as the tensioning hoses 65, 66. The translational movement of the filling tubes 64 and 67 on the nozzle tube 51 causes the compression of the two Tensioning hoses 65, 66, which also include the intermediate space 72 seals. Potting material is on the valve coupling 55 fed into the injection packer 50 under pressure; the Potting material passes through passages 54 and 51a and holes 69 and 68 in space 72.

It is within the scope of the invention as in the claims described, a known, no holes tube spreader to be equipped with a nozzle 41 and a sealing device, e.g. 43, in the joint area between two successively created To supply concrete bodies with sealant as described, for which the injection packer 50 described is particularly good suitable is. Introducing the sealant into the Pipe spreader 40 without holes with nozzle 41 can also with conventional injection packers in a conventional manner respectively.

It is also within the scope of the invention as in the Claims described, pipe spreader 40, a nozzle 41 have to be used in one operation with in one injection spreader used several neighboring pipe spreads 40 to decay simultaneously, the spigot of the adjacent pipe spreader 40 over Connect hoses and / or pipes and the dent openings of the adjacent pipe spreaders 40 are blocked. At the same time it can also corresponding connection a sealing device 43rd be included.

Claims (7)

1. Method for the construction of a concrete wall using shuttering, in which shuttering panels (1, 2) are braced parallel to one another a distance apart corresponding to the thickness of the concrete wall to be built, by means of screw-ties (3) comprising tubular spacers (40), such that after the space between the shuttering panels has been filled with the wet concrete and the concrete has set, the screw-ties (3) are removed and the shuttering panels (1, 2) are knocked off and the tubular spacers (40) remaining in the concrete wall are then filled with a cast material to seal the bracing points,
   characterised in that
   the tubular spacers (40) are connected each to at least one other tubular spacer (40) and/or to a sealing device (43a) known in its own right via a tube (41, 42) connected to an opening in the sleeve of the tubular spacers, so that when the tubular spacers (40) are filled, the cast material is pressed via the tube (41, 42) into the other tubular spacer (40) and/or into the sealing device (43a).
2. Method according to Claim 1,
   characterised in that
   the concrete wall is constructed over a concrete foundation, for example a concrete raft, the sealing device (43a) known in its own right is arranged in the area adjacent to where the concrete wall joins the concrete foundation, for example with an injection channel open towards the concrete foundation, and once the concrete wall has been put up, cast material is pressed via a hose (42) or tube into any hollow spaces and/or cracks between the concrete wall and the concrete foundation and the injection channel and the concrete wall.
3. Method according to Claim 1 and/or Claim 2,
   characterised in that
   a tubular spacer (40) is used, such that to the said tubular spacer (40) is attached a tubular connector (41) extending sideways therefrom and which communicates with the inside thereof, to enable connection to at least one further tubular spacer (40) and/or to an injection channel of a sealing device (43a).
4. Method according to Claim 3,
   characterised in that
   a tubular spacer (40) is used, on which the tubular connector (41) is formed and extends radially from the tubular spacer (40), the said connector having a smaller diameter than the tubular spacer (40), being connected solidly thereto, and opening into the inside thereof.
5. Method according to Claim 3 and/or Claim 4,
   characterised in that
   a tubular spacer (40) is used which, in its sleeve (18), has at least one hole (11).
6. Method according to one or more of Claims 1 to 5,
   characterised in that
   a device is used which consists of a tubular spacer (40) and an injection packer (50) that can be inserted into the tubular spacer (40), the said packer comprising a central nozzle tube (51) provided with holes (69) in its sleeve and an enclosing pipe section (67) with holes (68) and having bracing tubes (65, 66) arranged on either side of the said enclosing pipe section and a nozzle head closure cap (70) at the end.
7. Method according to Claim 6,
   characterised in that
   an injection packer (50) is used, in which a casing tube (64) is positioned around and can move over the nozzle tube (51), the said tube (64) comprising holes (69) opposite the injection holes (68), a connection end for a casting material feed hose and an end closed off by the cap(70), such that the bracing tubes (65, 66) are formed as rings positioned around the nozzle tube adjacent to the central enclosing pipe section (67), the movable casing tube (64) is located between the ring (65) on the connection side and the connection end of the nozzle tube (51), one end of the tube (64) being acted upon by a clamping screw (62) that engages in threaded connection with an outer thread (52) of the nozzle tube (51), and such that the cap (70) located in a fixed position over the end of the nozzle tube acts as the abutment for the clamping screw (62).

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