EP0009607B1 - Closure for a pre-stress channel of a pre-stressed concrete element - Google Patents

Closure for a pre-stress channel of a pre-stressed concrete element Download PDF

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Publication number
EP0009607B1
EP0009607B1 EP79103113A EP79103113A EP0009607B1 EP 0009607 B1 EP0009607 B1 EP 0009607B1 EP 79103113 A EP79103113 A EP 79103113A EP 79103113 A EP79103113 A EP 79103113A EP 0009607 B1 EP0009607 B1 EP 0009607B1
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EP
European Patent Office
Prior art keywords
closure
porous
sleeve
injection
closure part
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EP79103113A
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German (de)
French (fr)
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EP0009607A1 (en
Inventor
Klemens Dr. Finsterwalder
Oswald Dipl.-Ing. Nützel
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Nutzel Oswald Dipl-Ing
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Nutzel Oswald Dipl-Ing
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Priority to AT79103113T priority Critical patent/ATE265T1/en
Publication of EP0009607A1 publication Critical patent/EP0009607A1/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/10—Ducts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing

Definitions

  • the invention relates to a closure for ventilation openings of a prestressing channel in a prestressed concrete body or a press room, into which material to be injected, for example cement or grout, is introduced under pressure via an injection opening.
  • the work on the injection and on the ventilation side of the tensioning channel must be monitored by one worker.
  • the worker at the ventilation point observes the consistency of the emerging cement mortar and closes the connection when he believes the mortar has the correct consistency.
  • the injection pump generally delivers a uniform consistency of cement mortar; however, the mortar is often of uneven quality due to air and water residues in the span channel.
  • the quality of the injection depends very much on the care and training of the personnel.
  • the quality control of the pressing is only carried out on a large part of the tendons, so that considerable experience is required.
  • Amounts of water and dilution of the mortar - mainly due to rain and condensation water in the clamping channels, but also mixing water from the surrounding concrete, which penetrates the cladding pipes through leaks - are often not recognized.
  • the result is an incomplete covering of the tendon with cement mortar.
  • a complete covering of the tendon with cement mortar is absolutely necessary due to the associated corrosion protection. If there is a lack of care, part of the material to be injected can leak again, and this not only because of the pressure, but also in the case of inclined tendons.
  • this first method is extremely labor-intensive and personnel-intensive, since one man is required for the work and the monitoring on the ventilation side as well as on the injection side and any intermediate vents that may be present.
  • This second method is also very time-consuming and therefore labor-intensive and requires relatively high investment costs. Similar problems exist when injecting material to be injected into other press rooms, for example in the manufacture of rock anchors. The quality of the injection and the rock anchor also depends on the consistency of the grouted cement mortar.
  • the invention has for its object to fill a clamping channel or generally a press room to be filled with injection material and then to be able to close it in such a way that a reproducibly good, seamless connection between prestressing steel and cladding tube and air and water-free filling of the press room can be achieved without high personnel and material costs Injectable material of perfect consistency is possible.
  • closure has a closure part covering the vent opening made of porous material, the pores of which are selected such that air and low-viscosity substances are let through, but injection material from the desired consistency is not let through.
  • the porous closure part is, for example, a semipermeable membrane or a fine-mesh network or tissue or a part made of open-cell Plastic.
  • the pores or meshes of the closure part have a diameter between 50 and 500 micrometers; For conventional cement or grout for prestressed concrete bodies, a diameter of typically 150 to 180 micrometers is recommended. These values can of course be changed depending on the consistency of the material to be injected.
  • a closure according to the invention preferably has a sleeve which can be screwed onto the thread of the vent connections on whose one free open side is closed off by the porous closure part, for example a fine-mesh network.
  • the net is either placed around the sleeve and fastened here accordingly, or e.g. attached to a ring which is pushed into the sleeve and abuts an inwardly bent end collar of the sleeve.
  • the closure part can be a plastic plug inserted into the sleeve and bearing against the inwardly bent collar of the sleeve.
  • the invention is based on the knowledge that a porous closure part, such as a semipermeable membrane, a fine-meshed net or a.
  • Plastic plug made of open-cell plastic can be designed so that it is permeable to air, water and cement or grout with too high a water content, but impermeable to cement mortar with the right water content.
  • a clamping channel closed with a closure according to the invention accordingly has practically only one injection opening for the material to be injected, which has a desired and desired consistency or viscosity or viscosity, but no outflow opening; for all other media occurring in the tensioning channel, however, the tensioning channel is freely accessible.
  • the pressing of such a tensioning channel takes place as follows: The cement mortar is pressed into the tensioning channel from the injection opening. Air and water escape through the porous closure part of the closure, as does cement mortar with an excessively high water content that is not planned. If the tensioning channel is filled with cement mortar with a consistent consistency, the pores of the closure part close automatically. The pressure rises until the injection pump is switched off or switches off automatically at an adjustable maximum pressure. The clamping channel on the injection side is closed with a slide, whereby the pressure in the clamping channel is maintained even when the cement mortar hardens. The pump injection port can then be removed.
  • a tendon consists of a prestressing steel 1, end anchors 2, a cladding tube 3, an injection connection 4 and a ventilation connection 5.
  • the prestressing channel is formed by the piping.
  • the tensioning channel is shown shortly before the injection process.
  • cement mortar is injected through an injection connection 8 into the tensioning channel between the cladding tube and the tensioning device steel 1 pressed.
  • Any dirt residues and water that may be present are displaced by the cement mortar and removed from the tensioning channel by the fine-mesh network 6.
  • Excess water and cement mortar of unsuitable consistency also penetrate the network 6, which, however, is impermeable to cement mortar of the correct consistency.
  • the network 6 automatically closes the tensioning channel, as a result of which the pressure in it increases until the inflow of cement mortar through the compression hose 7 when a predetermined limit pressure is reached is switched off. Then the injection port is closed by a slide 9 and then the compression hose 7 is removed. The cement mortar pressed into the clamping channel can now harden while still under the injection pressure.
  • Figure 2 shows the clamping channel pressed with cement mortar 10, which is now closed to the outside.
  • Figure 3 shows schematically the formation of a closure; this consists of a sleeve 13, which is screwed onto the end of the vent connection 5, and of a fine-meshed mesh or fabric 11, which is firmly connected to the sleeve and which, when injected, stretches to the spherical shape shown.
  • the closure also consists of a sleeve 14 screwed onto the vent connection and a porous plastic plug 12 which is either inserted into the vent connection and held by a rear collar 14 'of the sleeve or is pressed between the collar and the connection end.
  • FIG. 5 shows an automatic closure for a tensioning channel that is easy and inexpensive to produce; the closure in turn has a sleeve 14 which is plugged or screwed onto the vent connection and has an inwardly bent collar 14 '.
  • An annular sealing ring 11 ' is inserted into the sleeve, to which a fine-mesh network 11 covering the free opening of the ring is connected.
  • closures such as cuff closures
  • a fine-mesh net is placed around a vent connection that is only open at the side or directly around the cladding tube and fastened there.
  • closure according to the invention can also be used for quality control of the injection material used.
  • the filling of the tensioning channel can be checked by inspecting the porous closure part.
  • the required properties of cement and grout for prestressed concrete elements are defined by standards; it is also specified that when the clamping bodies are pressed, samples of the respective cement mortar are taken from the sampling container at certain time intervals and are checked for their compressive strength after hardening.
  • the consistency of the removed cement mortar should be the same as that of the cement mortar pressed into the clamping channel or press chamber.
  • the sampling container is only filled when the uniform consistency of the cement mortar emerging from the clamping channel or press chamber is determined by visual inspection. After removal, the clamping channel or press chamber is closed as usual.
  • This sampling can be significantly simplified by a modified sampling container 15.
  • the container 15 has a filling opening 16 and an outlet opening 17.
  • the filler opening 16 is designed so that it extends onto the ventilation opening 5 e.g. of the tensioning channel, similar to the closure described above, can be attached or screwed, while the outlet opening 17 is closed with one of the closures V described above - for example with a net closure 11.
  • the clamping channel or press chamber is filled with cement mortar as described, 15 injection material is also pressed into the sampling container. First air, water and too thin cement mortar escape through the closure, which only automatically closes the container when the cement mortar has the correct consistency. In this way, the clamping channel or pressing chamber and sampling container are filled with cement mortar of the same consistency, so that the quality of the cement mortar in the sampling container corresponds to that in the clamping channel or pressing chamber. After hardening, the sampling container is removed from the ventilation opening of the clamping channel and the strength of the cement mortar can be checked as usual.
  • Such a sampling container can of course also be used to check the cement mortar, which is directly delivered by the injection pump, so that it can be easily checked whether the mortar has already reached the desired consistency.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Lining And Supports For Tunnels (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

1. Closure for ventilation openings (5, 5') of a cable duct in a prestressed concrete member or of a pressing chamber, into which injection material (10), for example cement or intrusion mortar, is moved under pressure through an injection opening (4), characterized in that the closure (V) includes a closure part (6, 11, 12) of porous material, which covers the ventilation opening and the pores of which are chosen such that air and thin-liquid materials can pass therethrough, but injection material (10) of the thinnest desired consistency cannot pass through.

Description

Die Erfindung bezieht sich auf einen Verschluß für Entlüftungsöffnungen eines Spannkanales in einem Spannbetonkörper bzw. eines Preßraumes, in den über eine Injizieröffnung Injuziergut, zum Beispiel Zement- bzw. Einpreßmörtel unter Druck eingebracht wird.The invention relates to a closure for ventilation openings of a prestressing channel in a prestressed concrete body or a press room, into which material to be injected, for example cement or grout, is introduced under pressure via an injection opening.

In Spannbetonkörpern wird bei gespanntem Zustand der Spannglieder bzw. Spannstähle in die sie aufnehmenden Hüllrohre Zementmörtel eingepreßt, um den Hohlraum zwischen Spannstahl und Hüllrohr, d.h. den Spannkanal auszufüllen und zwischen Spannstahl und Hüllrohr einen lückenlosen Verbund herzustellen. Dieses Einpressen von Zementmörtel in den Spannkanal wird heute nach zwei Verfahren durchgeführt : `

  • a) Der Spannkanal hat an beiden Enden eine Öffnung. Das Injizieren erfolgt durch Durchpressen von Zementmörtel von einer Öffnung zur anderen. Nach dem Injizieren werden beide Öffnungen zum Beispiel durch Schieber verschlossen, die auf die Öffnungen aufgesetzt bzw. aufgeschraubt sind.
  • b) Der Spannkanal ist an einem Ende geöffnet, am gegenüberliegenden Ende geschlossen. Hierbei wird vor oder zu Beginn des Einpressens des Injiziergutes in den Hüllrohren ein Unterdruck erzeugt ; erst danach wird der Hohlraum durch Zementmörtel mit anschließendem Nachpressen mit Überdruck aufgefüllt ; vgl. DE-C-1684437.
In prestressed concrete bodies, when the tendons or prestressing steel are tensioned, cement mortar is pressed into the cladding tubes receiving them in order to fill the cavity between prestressing steel and cladding tube, ie to fill the prestressing channel and to create a seamless bond between prestressing steel and cladding tube. This pressing of cement mortar into the prestressing channel is carried out today using two methods: `
  • a) The tension channel has an opening at both ends. The injection is carried out by pressing cement mortar from one opening to the other. After the injection, both openings are closed, for example, by sliders which are placed or screwed onto the openings.
  • b) The tensioning channel is open at one end and closed at the opposite end. In this case, a negative pressure is generated in the cladding tubes before or at the beginning of the injection of the injection material; only then is the cavity filled up with cement mortar and then pressed with overpressure; see. DE-C-1684437.

Beide untera) und b) genannten Verfahren haben typische, durch die Art des Verfahrens bedingte Nachteile, die bei bestimmten mehr oder weniger oft auftretenden Randbedingungen zu unvollständigem Ausfüllen der Hohlräume führen können.Both of the methods mentioned under a) and b) have typical disadvantages due to the nature of the method, which can lead to incomplete filling of the cavities under certain more or less often occurring boundary conditions.

Beim ersten Verfahren nach Punkt a) müssen die Arbeiten an der Injizier- und an der Entlüftungsseite des Spannkanales jeweils von einem Arbeiter überwacht werden. Der Arbeiter an der Entlüftungsstelle beobachtet die Konsistenz des austretenden Zementmörtels und verschließt den Anschluß dann, wenn der Mörtel seiner Meinung nach die richtige Konsistenz hat. Zwar wird von der Injizierpumpe im allgemeinen Zementmörtel gleichmäßiger Konsistenz geliefert ; jedoch ist der Mörtel durch Luft und Wasserrückstände im Spannkanal anfangs oft von ungleichmäßiger Qualität. Damit hängt aber die Güte der Injektion sehr stark von der Sorgfalt und Schulung des Personals ab. Die Gütekontrolle der Verpressung wird bei einem großen Teil der Spannglieder nur nach Augenschein durchgeführt, so daß hierzu erhebliche Erfahrung notwendig ist. Wasserbeimengen und Verdünnung des Mörtels - hauptsächlich durch in den Spannkanälen stehendes Regen- und Kondenswasser, aber auch Anmachwasser des umgebenden Betons, das durch undichte Stellen in die Hüllrohre eindringt - werden oft nich erkannt. Eine unvollständige Umhüllung des Spanngliedes mit Zementmörtel ist die Folge. Eine lückenlose Umhüllung des Spanngliedes mit Zementmörtel ist jedoch wegen des damit verbundenen Korrosionsschutzes unbedingt notwendig. Bei mangelnder Sorgfalt kann auch ein Teil des Injiziergutes, und dies wegen des Preßdruckes nicht nur bei schräg liegenden Spanngliedern, wieder auslaufen.In the first procedure according to point a), the work on the injection and on the ventilation side of the tensioning channel must be monitored by one worker. The worker at the ventilation point observes the consistency of the emerging cement mortar and closes the connection when he believes the mortar has the correct consistency. The injection pump generally delivers a uniform consistency of cement mortar; however, the mortar is often of uneven quality due to air and water residues in the span channel. However, the quality of the injection depends very much on the care and training of the personnel. The quality control of the pressing is only carried out on a large part of the tendons, so that considerable experience is required. Amounts of water and dilution of the mortar - mainly due to rain and condensation water in the clamping channels, but also mixing water from the surrounding concrete, which penetrates the cladding pipes through leaks - are often not recognized. The result is an incomplete covering of the tendon with cement mortar. A complete covering of the tendon with cement mortar is absolutely necessary due to the associated corrosion protection. If there is a lack of care, part of the material to be injected can leak again, and this not only because of the pressure, but also in the case of inclined tendons.

Darüber hinaus ist dieses erste Verfahren überaus arbeits- und personalaufwendig, da für die Arbeiten und die Überwachung an der Entlüftungsseite wie an der Injizierseite und an eventuell vorhandenen Zwischenentlüftungen jeweils ein Mann benötigt wird.In addition, this first method is extremely labor-intensive and personnel-intensive, since one man is required for the work and the monitoring on the ventilation side as well as on the injection side and any intermediate vents that may be present.

Beim zweiten Verfahren nach Abschnitt b) können im Spannkanal Lufteinschlüsse verblei- .ben, da eine hundertprozentige Evakuierung nicht möglich ist und der Spannkanal in der Regel nicht absolut luftdicht ist. Wenn Wasser im Spannkanal ist, was häufig der Fall ist, da die Spannkanäle vor der Injizierung oft längere Zeit offen stehen und sich daher in ihnen Regen- und Kondenswasser oder bei undichten Hüllrohren auch Anmachwasser des Betons sammeln, kann dieses Wasser durch Evakuierung nicht entfernt werden. Es ist darüber hinaus auch meist nicht zu erkennen, ob Wasser im Spannkanal ist. Wird eine « Vakuum-Injektion » unter diesen Umständen durchgeführt, so ist ein Teil des Spanngliedes mit Sicherheit nicht mit Mörtel umhüllt. Beide genannten Nachteile verhindern ein lückenloses Ausfüllen des Ringraumes zwischen Spannstahl und Hüllrohr, so daß Korrosion eintreten kann.In the second method according to section b), air pockets can remain in the clamping channel, since 100% evacuation is not possible and the clamping channel is generally not absolutely airtight. If there is water in the tensioning channel, which is often the case, since the tensioning channels are often open for a long time before the injection and rain and condensation water or, in the case of leaking cladding pipes, also mixing water of the concrete collect in them, this water cannot be removed by evacuation . In addition, it is usually not possible to tell whether there is water in the tension channel. If a «vacuum injection» is carried out under these circumstances, part of the tendon is certainly not covered with mortar. Both disadvantages mentioned prevent a gap-free filling of the annular space between prestressing steel and cladding tube, so that corrosion can occur.

Dieses zweite Verfahren ist zudem sehr zeit-und damit arbeitsaufwendig und erfordert verhältnismäßig hohe Investitionskosten. Ähnliche Probleme sind beim Einpressen von Injiziergut in andere Preßräume vorhanden, so zum Beispiel bei der Herstellung von Felsankern. Die Güte der Injektion und des Felsankers hängt hier ebenso von der Konsistenz des eingepreßten Zementmörtels ab.This second method is also very time-consuming and therefore labor-intensive and requires relatively high investment costs. Similar problems exist when injecting material to be injected into other press rooms, for example in the manufacture of rock anchors. The quality of the injection and the rock anchor also depends on the consistency of the grouted cement mortar.

Der Erfindung liegt die Aufgabe zugrunde, einen Spannkanal bzw. allgemein einen mit Injiziergut auszufüllenden Preßraum so ausfüllen und danach verschließen zu können, daß ohne hohen Personal- und Materialaufwand ein reproduzierbar guter lückenloser Verbund zwischen Spannstahl und Hüllrohr und einluft- und wassernestfreies Ausfüllen des Preßraumes mit Injiziergut einwandfreier Konsistenz möglich ist.The invention has for its object to fill a clamping channel or generally a press room to be filled with injection material and then to be able to close it in such a way that a reproducibly good, seamless connection between prestressing steel and cladding tube and air and water-free filling of the press room can be achieved without high personnel and material costs Injectable material of perfect consistency is possible.

Diese Aufgabe ist gemäß der Erfindung dadurch gelöst, daß der Verschluß ein die Entlüftungsöffnung überdeckendes Verschlußteil aus porösem Material aufweist, dessen Poren so gewählt sind, daß Luft und dünnflüssige Stoffe hindurchgelassen, Injiziergut ab der gewünschten Konsistenz jedoch nicht hindurchgelassen werden.This object is achieved according to the invention in that the closure has a closure part covering the vent opening made of porous material, the pores of which are selected such that air and low-viscosity substances are let through, but injection material from the desired consistency is not let through.

Das poröse Verschlußteil ist zum Beispiel eine semipermeable Membran bzw. ein feinmaschiges Netz bzw. Gewebe oder ein Teil aus offenzelligem Kunststoff. Die Poren bzw. Maschen des Verschlußteiles weisen einen Durchmesser zwischen 50 und 500 Mikrömetern auf ; für üblichen Zement- bzw. Einpreßmörtel für Spannbetonkörper wird ein Durchmesser von typisch 150 bis 180 Mikrometern empfohlen. Diese Werte können selbstverständlich abhängig von der Konsistenz des Injiziergutes verändert werden.The porous closure part is, for example, a semipermeable membrane or a fine-mesh network or tissue or a part made of open-cell Plastic. The pores or meshes of the closure part have a diameter between 50 and 500 micrometers; For conventional cement or grout for prestressed concrete bodies, a diameter of typically 150 to 180 micrometers is recommended. These values can of course be changed depending on the consistency of the material to be injected.

Da die meisten Spannkanäle bereits einen Entlüftungsanschluß mit Gewinde aufweisen, auf den normalerweise die oben erwähnten Schieber oder Stöpsel zum Verschließen der Injizier- bzw. Entlüftungsöffnungen auf- bzw. eingeschraubt werden, weist ein Verschluß gemäß der Erfindung bevorzugt eine auf das Gewinde der Entlüftungsanschlüsse schraubbare Hülse auf, deren eine freie offene Seite durch das poröse Verschlußteil, zum Beispiel ein feinmaschiges Netz, abgeschlossen ist. Das Netz ist entweder um die Hülse gelegt und hier entsprechend befestigt, oder z.B. an einem Ring befestigt, der in die Hülse geschoben und an einem nach innen gebogenen Endkragen der Hülse anliegt. Ebenso kann das Verschlußteil ein in die Hülse eingesetzter und an den nach innen gebogenen Kragen der Hülse anleigender Kunststoffpfropfen sein.Since most of the tensioning channels already have a threaded vent connection onto which the above-mentioned sliders or plugs for closing the injection or vent openings are screwed or screwed, a closure according to the invention preferably has a sleeve which can be screwed onto the thread of the vent connections on whose one free open side is closed off by the porous closure part, for example a fine-mesh network. The net is either placed around the sleeve and fastened here accordingly, or e.g. attached to a ring which is pushed into the sleeve and abuts an inwardly bent end collar of the sleeve. Likewise, the closure part can be a plastic plug inserted into the sleeve and bearing against the inwardly bent collar of the sleeve.

Wird ein Spannkanal mit einem Verschluß gemäß der Erfindung abgeschlossen, so werden die bei den obigen Verfahren a) und b) auftretenden Nachteile vermieden.If a tensioning channel is closed with a closure according to the invention, the disadvantages occurring in the above methods a) and b) are avoided.

Die Erfindung baut auf der Erkenntnis auf, daß ein poröses Verschlußteil, wie eine semipermeable Membran, ein feinmaschiges Netz oder ein . Kunststoffpfropfen aus offenzelligem Kunststoff, so konstruiert werden kann, daß es durchlässig ist für Luft, Wasser und Zement- bzw. Einpreßmörtel mit zu hohem Wassergehalt, undurchlässig jedoch für Zementmörtel mit richtigem Wassergehalt. Ein mit einem Verschluß gemäß der Erfindung verschlossener Spannkanal weist demnach praktisch für das Injiziergut planmäßiger und gewünschter Konsistenz bzw. Zähigkeit oder Viskosität nur eine Injizieröffnung, jedoch keine Ausflußöffnung auf ; für alle anderen im Spannkanal vorkommenden Medien ist der Spannkanal jedoch frei durchgängig.The invention is based on the knowledge that a porous closure part, such as a semipermeable membrane, a fine-meshed net or a. Plastic plug made of open-cell plastic, can be designed so that it is permeable to air, water and cement or grout with too high a water content, but impermeable to cement mortar with the right water content. A clamping channel closed with a closure according to the invention accordingly has practically only one injection opening for the material to be injected, which has a desired and desired consistency or viscosity or viscosity, but no outflow opening; for all other media occurring in the tensioning channel, however, the tensioning channel is freely accessible.

Das Verpressen eines solchen Spannkanales läuft wie folgt ab : Der Zementmörtel wird von der Injizieröffnung aus in den Spannkanal eingepreßt. Luft und Wasser entweichen durch das poröse Verschlußteil des Verschlusses, ebenso Zementmörtel mit nicht planmäßigem zu hohen Wassergehalt. Ist der Spannkanal mit Zementmörtel planmäßiger Konsistenz gefüllt, verschließen sich die Poren des Verschlußteiles automatisch. Der Druck steigt an, bis die Injizierpumpe abgeschaltet wird oder sich bei einem einstellbaren Höchstdruck automatisch abschaltet. Mit einem Schieber wird der Spannkanal an der Injizierseite geschlossen, wobei der Druck im Spannkanal auch bei der Erhärtung des Zementmörtels erhalten bleibt. Der Injizieranschluß der Pumpe kann dann abgenommen werden.The pressing of such a tensioning channel takes place as follows: The cement mortar is pressed into the tensioning channel from the injection opening. Air and water escape through the porous closure part of the closure, as does cement mortar with an excessively high water content that is not planned. If the tensioning channel is filled with cement mortar with a consistent consistency, the pores of the closure part close automatically. The pressure rises until the injection pump is switched off or switches off automatically at an adjustable maximum pressure. The clamping channel on the injection side is closed with a slide, whereby the pressure in the clamping channel is maintained even when the cement mortar hardens. The pump injection port can then be removed.

Die Erläuterungen gelten sinngemäß selbstverständlich auch für andere Preßräume als Spannkanäle, so zum Beispiel für die oben erwähnten Felsanker.Of course, the explanations also apply analogously to press rooms other than clamping channels, for example to the rock anchors mentioned above.

Die Vorteile des erwähnten Verfahrens bestehen also darin :

  • - im Spannkanal verbleibt keine Luft ;
  • - im Spannkanal verbleibt kein Wasser ;
  • - der Spannkanal ist nur mit Zementmörtel planmäßiger Konsistenz gefüllt, da Luft, Wasser und zu dünnflüssiger Zementmörtel herausgedrückt werden ;
  • - der Spannkanal wird noch unter Druck stehend verschlossen und die Erhärtung des Zementmörtels erfolgt ebenfalls unter Druck ;
  • - ein - unbeabsichtigtes - Auslaufen des Injiziergutes ist nicht möglich ;
  • - die Arbeiten können sehr arbeitssparend durchgeführt werden, da der Verpreßvorgang weitgehend unabhängig von der Sorgfalt des Personals ist ;
  • - die Gütekontrolle der Injekton ist einfach durch Inaugenscheinnahme der Entlüftungsöffnungen bzw. der Außenflächen des porösen Verschlußteiles des porösen Verschlusses durchzuführen ;
  • - die Investitionskosten sind niedrig.
The advantages of the mentioned method are:
  • - no air remains in the tensioning channel;
  • - no water remains in the tension channel;
  • - The clamping channel is only filled with cement mortar according to plan, as air, water and too thin cement mortar are pressed out;
  • - The clamping channel is closed while still under pressure and the cement mortar also hardens under pressure;
  • - an - unintentional - leakage of the injection material is not possible;
  • - The work can be carried out in a very labor-saving manner, since the pressing process is largely independent of the care taken by the staff;
  • - The quality control of the injectors can be carried out simply by inspecting the ventilation openings or the outer surfaces of the porous closure part of the porous closure;
  • - the investment costs are low.

Die Erfindung ist in mehreren Ausführungsbeispielen anhand der Zeichnung näher erläutert. In dieser stellen dar:

  • Figur 1 einen Querschnitt durch einen Spannkanal, der mit einem Verschluß gemäß der Erfindung abgeschlossen ist, vor dem Einpressen von Zementmörtel ;
  • Figur 2 einen Querschnitt durch den mit Zementmörtel gefüllten und abgesperrten Spannkanal gemäß Figur 1 ;
  • Figur 3 schematisch die Ausbildung eines Verschlusses gemäß der Erfindung ;
  • Figur 4 eine weitere Ausführungsform eines Verschlusses gemäß der Erfindung ;
  • Figur 5 eine dritte Ausführungsform eines Verschlusses gemäß der Erfindung ;
  • Figur 6 schematisch einen Querschnitt durch einen Probeentnahmebehälter für Zementmörtel, der mit einem Verschluß gemäß der Erfindung abgeschlossen ist ;
  • Figur 7 einem Schnitt durch den Probeentnahmebehälter längs der Linie VII-VII.
The invention is explained in more detail in several exemplary embodiments with reference to the drawing. In this represent:
  • 1 shows a cross section through a clamping channel, which is completed with a closure according to the invention, before cement mortar is pressed in;
  • FIG. 2 shows a cross section through the clamping channel according to FIG. 1 filled and sealed with cement mortar;
  • Figure 3 shows schematically the formation of a closure according to the invention;
  • Figure 4 shows a further embodiment of a closure according to the invention;
  • Figure 5 shows a third embodiment of a closure according to the invention;
  • Figure 6 schematically shows a cross section through a sampling container for cement mortar, which is closed with a closure according to the invention;
  • Figure 7 shows a section through the sampling container along the line VII-VII.

Ein Spannglied besteht aus einem Spannstahl 1, Endverankerungen 2, einem Hüllrohr 3, einem Injizieranschluß 4 und einem Entlüftungsanschluß 5. Durch die Verrohrung wird der Spannkanal gebildet. Bei längeren Spanngliedern sind hier nur angedeutete Zwischenentlüftungsöffnungen 5' vorgesehen. Die Entlüftungsanschlüsse 5 bzw: 5' sind durch jeweils einen Verschluß V mit einem Verschlußteil 6 aus einem porösen Material, in diesem Falle eine semipermeable Membran bzw. ein feinmaschiges Netz bzw. Gewebe abgeschlossen.A tendon consists of a prestressing steel 1, end anchors 2, a cladding tube 3, an injection connection 4 and a ventilation connection 5. The prestressing channel is formed by the piping. In the case of longer tendons, only indicated intermediate ventilation openings 5 'are provided here. The vent connections 5 and 5 'are each closed by a closure V with a closure part 6 made of a porous material, in this case a semipermeable membrane or a fine-meshed network or fabric.

In Figur 1 ist der Spannkanal kurz vor dem Injiziervorgang dargestellt. Über einen vom hier nicht gezeigten Injiziergerät bzw. der Injizierpumpe kommenden Verpreßschlauch 7 wird Zementmörtel durch einen lnjizieranschluß8 in den Spannkanal zwischen Hüllrohr und Spannstahl 1 eingepreßt. Eventuell vorhandene Schmutzreste und Wasser werden durch den Zementmörtel verdrängt und durch das feinmaschige Netz 6 aus dem Spannkanal entfernt. Überschußwasser und Zementmörtel nicht geeigneter Konsistenz durchdringen ebenfalls das Netz 6, das jedoch undurchlässig ist für Zementmörtel der richtigen Konsistenz. Die Folge ist, daß in dem Augenblick, in dem der Spannkanal vollständig mit Zementmörtel richtiger Konsistenz gefüllt ist, das Netz 6 automatisch den Spannkanal verschließt, wodurch der Druck in diesem ansteigt, bis bei Erreichen eines vorgegebenen Grenzdruckes der Zufluß von Zementmörtel durch den Verpreßschlauch 7 abgeschaltet wird. Dann wird der Injizieranschluß durch einen Schieber 9 geschlossen und danach der Verpreßschlauch 7 abgenommen. Der in den Spannkanäl eingepreßte Zementmörtel kann nun, noch unter dem Injizierdruck stehend, erhärten.In Figure 1, the tensioning channel is shown shortly before the injection process. Via an injection hose 7 coming from the injection device or the injection pump (not shown here), cement mortar is injected through an injection connection 8 into the tensioning channel between the cladding tube and the tensioning device steel 1 pressed. Any dirt residues and water that may be present are displaced by the cement mortar and removed from the tensioning channel by the fine-mesh network 6. Excess water and cement mortar of unsuitable consistency also penetrate the network 6, which, however, is impermeable to cement mortar of the correct consistency. The result is that, at the moment when the tensioning channel is completely filled with cement mortar of the correct consistency, the network 6 automatically closes the tensioning channel, as a result of which the pressure in it increases until the inflow of cement mortar through the compression hose 7 when a predetermined limit pressure is reached is switched off. Then the injection port is closed by a slide 9 and then the compression hose 7 is removed. The cement mortar pressed into the clamping channel can now harden while still under the injection pressure.

Figur 2 zeigt den mit Zementmörtel 10 verpreßten Spannkanal, der jetzt nach außen hin verschlossen ist.Figure 2 shows the clamping channel pressed with cement mortar 10, which is now closed to the outside.

Figur 3 zeigt schematisch die Ausbildung eines Verschlusses ; dieser besteht aus einer Hülse 13, die auf das Ende des Entlüftungsanschlusses 5 geschraubt ist, und aus einem mit der Hülse fest verbundenen feinmaschigen Netz bzw. Gewebe 11, das sich bei der Injizierung auf die gezeigte Kugetform spannt.Figure 3 shows schematically the formation of a closure; this consists of a sleeve 13, which is screwed onto the end of the vent connection 5, and of a fine-meshed mesh or fabric 11, which is firmly connected to the sleeve and which, when injected, stretches to the spherical shape shown.

Bei der in Figur4 gezeigten Ausführungsform besteht der Verschluß ebenfalls aus einer auf den Entlüftungsanschluß geschraubten Hülse 14 sowie einem porösen Kunststoffpfropfen 12, der entweder in den Entlüftungsanschluß gesteckt und von einem hinteren Kragen 14' der Hülse gehalten oder zwischen Kragen und Anschlußende eingepreßt ist.In the embodiment shown in Figure 4, the closure also consists of a sleeve 14 screwed onto the vent connection and a porous plastic plug 12 which is either inserted into the vent connection and held by a rear collar 14 'of the sleeve or is pressed between the collar and the connection end.

In Figur 5 ist ein leicht und billig herzustellender automatischer Verschluß für einen Spannkanal dargestellt ; der Verschluß weist wiederum eine auf den Entlüftungsanschluß gesteckte bzw. geschraubte Hülse 14 mit einem nach innen gebogenen Kragen 14' auf. In die Hülse ist ein kreisringförmiger Dichtring 11' eingesetzt, mit dem ein die freie Öffnung des Ringes überdeckendes feinmaschiges Netz 11 verbunden ist. Wenn der Verschluß auf den Entlüftungsanschluß geschraubt ist, wird der Ring 11' zwischen Kragen 14' und dem Ende des Entlüftungsanschlusses eingepreßt.FIG. 5 shows an automatic closure for a tensioning channel that is easy and inexpensive to produce; the closure in turn has a sleeve 14 which is plugged or screwed onto the vent connection and has an inwardly bent collar 14 '. An annular sealing ring 11 'is inserted into the sleeve, to which a fine-mesh network 11 covering the free opening of the ring is connected. When the closure is screwed onto the vent connection, the ring 11 'is pressed between the collar 14' and the end of the vent connection.

Neben den beschriebenen hülsenförmigen Verschlüssen sind selbstverständlich auch andere Verschlußarten, wie Manschettenverschlüsse, möglich, indem etwa ein feinmaschiges Netz um einen nur seitlich offenen Entlüftungsanschluß oder direkt um das Hüllrohr gelegt und dort befestigt ist.In addition to the sleeve-shaped closures described, other types of closures, such as cuff closures, are of course also possible, in that, for example, a fine-mesh net is placed around a vent connection that is only open at the side or directly around the cladding tube and fastened there.

Neben den geschilderten Anwendungen zum Verschluß von Spannkanälen und sonstigen Pre-Sräumen im Spannbetonbau oder dgl. kann der Verschluß gemäß der Erfindung jedoch noch für die Gütekontrolle des verwendeten Injiziergutes verwendet werden.In addition to the described applications for the closure of tensioning channels and other pre-spaces in prestressed concrete construction or the like. However, the closure according to the invention can also be used for quality control of the injection material used.

Die Kontrolle der Verfüllung des Spannkanals kann durch Inaugenscheinnahme des porösen Verschlußteiles erfolgen.The filling of the tensioning channel can be checked by inspecting the porous closure part.

Bekanntlich sind die erforderlichen Eigenschaften von Zement- und Einpreßmörtel für Spannbetonelemente durch Normen festgelegt; außerdem ist festgelegt, daß beim Verpressen von Spannkörpern in bestimmten Zeitabständen Proben des jeweiligen Zementmörtels in Probeentnahmebehälter entnommen und nach dem Erhärten auf die Druckfestigkeit geprüft werden.As is known, the required properties of cement and grout for prestressed concrete elements are defined by standards; it is also specified that when the clamping bodies are pressed, samples of the respective cement mortar are taken from the sampling container at certain time intervals and are checked for their compressive strength after hardening.

Hierbei sollte die Konsistenz des entnommenen Zementmörtels gleich derjenigen des in den Spannkanal bzw. Preßraum eingepreßten Zementmörtels sein. Hierzu wird der Probeentnahmebehälter erst gefüllt, wenn durch Augenscheinnahme des aus dem Spannkanal bzw. Preßraum austretenden Zementmörtels dessen gleichmäßige Konsistenz festgestellt wird. Nach der Entnahme wird der Spannkanal bzw. Preßraum wie üblich verschlossen.Here, the consistency of the removed cement mortar should be the same as that of the cement mortar pressed into the clamping channel or press chamber. For this purpose, the sampling container is only filled when the uniform consistency of the cement mortar emerging from the clamping channel or press chamber is determined by visual inspection. After removal, the clamping channel or press chamber is closed as usual.

Diese Probeentnahme kann durch einen modifizierten Probeentnahmebehälter 15 wesentlich vereinfacht werden. Der Behälter 15 weist hierzu eine Einfüllöffnung 16 und eine Auslaßöffnung 17 auf. Die Einfüllöffnung 16 ist so ausgebildet, daß sie auf die Entlüftungsöffnung 5 z.B. des Spannkanales ähnlich wie der oben beschriebene Verschluß aufgesetzt bzw. geschraubt werden kann, während die Auslaßöffnung 17 mit einem der oben beschriebenen Verschlüsse V - etwa mit einem Netzverschluß 11 - abgeschlossen ist.This sampling can be significantly simplified by a modified sampling container 15. For this purpose, the container 15 has a filling opening 16 and an outlet opening 17. The filler opening 16 is designed so that it extends onto the ventilation opening 5 e.g. of the tensioning channel, similar to the closure described above, can be attached or screwed, while the outlet opening 17 is closed with one of the closures V described above - for example with a net closure 11.

Wird der Spannkanal bzw. Preßraum wie beschrieben mit Zementmörtel gefüllt, wird auch in den Probeentnahmebehälter 15 Injiziergut gepreßt. Zunächst entweichen dabei Luft, Wasser und zu dünnflüssiger Zementmörtel durch den Verschluß, der erst dann automatisch den Behälter verschließt, wenn der Zementmörtel die richtige Konsistenz aufweist. Auf diese Weise sind Spannkanal bzw. Preßraum und Probeentnahmebehälter mit Zementmörtel gleicher Konsistenz gefüllt, so daß die Güte des Zementmörtels im Probeentnahmebehälter derjenigen im Spannkanal bzw. Preßraum entspricht. Nach dem Erhärten wird der Probeentnahmebehälter von der Entlüftungsöffnung des Spannkanals abgenommen und der Zementmörtel kann wie üblich auf seine Festigkeit überprüft werden.If the clamping channel or press chamber is filled with cement mortar as described, 15 injection material is also pressed into the sampling container. First air, water and too thin cement mortar escape through the closure, which only automatically closes the container when the cement mortar has the correct consistency. In this way, the clamping channel or pressing chamber and sampling container are filled with cement mortar of the same consistency, so that the quality of the cement mortar in the sampling container corresponds to that in the clamping channel or pressing chamber. After hardening, the sampling container is removed from the ventilation opening of the clamping channel and the strength of the cement mortar can be checked as usual.

Ein derartiger Probeentnahmebehälter kann selbstverständlich auch zur Überprüfung des Zementmörtels verwendet werden, der direkt etwa von der Injizierpumpe abgegeben wird, so daß einfach geprüft werden kann, ob der Mörtel bereits die gewünschte Konsistenz erreicht hat.Such a sampling container can of course also be used to check the cement mortar, which is directly delivered by the injection pump, so that it can be easily checked whether the mortar has already reached the desired consistency.

Claims (10)

1. Closure for ventilation openings (5, 5') of a cable duct in a prestressed concrete member or of a pressing chamber, into which injection material (10), for example cement or intrusion mortar, is moved under pressure through an injection opening (4), characterised in that the closure (V) includes a closure part (6, 11, 12) of porous material, which covers the ventilation opening and the pores of which are chosen such that air and thin-liquid materials can pass therethrough, but injection material (10) of the thinnest desired consistency cannot pass through.
2. A closure according to Claim 1, characterised in that the porous closure part is a semipermeable membrane in the form of a fine- mesh screen or net fabric (6, 11).
3. A closure according to Claim 1, characterised in that the porous part is made of open-cell foam.
4. A closure of any of Claim 1 through 3, characterised in that the pores or meshes of the porous closure part (6, 11, 12) have a diameter of between 50 to 500 micrometers.
5. A closure according to Claim 4, characterised in that the diameter of the pores or meshes of the porous closure part (6, 11, 12) is approximate- ly 150 to 180 micrometers.
6. A closure of any of Claim 1 through 5, characterised in that the closure (V) has a sleeve (13, 14) which can be placed or screwed onto the ventilation connection (5, 5'), and which is closed off on its one side through the porous closure part (6, 11, 12).
7. A closure according to Claim 6, characterised in that the closure part in the form of a fine- mesh screen (6, 11) is placed over the one open end of the sleeve (13) and is fixed to the sleeve.
8. A closure according to Claim 6, characterised in that the closure part in the form of a fine- mesh screen (11) is fixed to a circular ring (11') movable into the sleeve and which rests against an inwardly bent end flange (14') of the sleeve.
9. A closure according to Claim 6, characterised in that the closure part is a plastic plug (12) of an open-cell plastic, which is inserted into the sleeve (14) or the ventilation connection (5) and rests on an inwardly bent end flange (14').
10. A closure especially of one of Claims 1 through 9, characterised in that, for examing the injection material, the closure (V) having the porous closure part (11) is used with a sample remov- ing container (15) for the injection material wherein the sample removing container has an inlet (16) to be placed or screwed onto the ventilation opening (5) of the cable duct or pressing chamber, for receiving the injection material and a ventilation connection (17) closed off with the closure (V).
EP79103113A 1978-09-05 1979-08-24 Closure for a pre-stress channel of a pre-stressed concrete element Expired EP0009607B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79103113T ATE265T1 (en) 1978-09-05 1979-08-24 CLOSURE FOR A TENSION CHANNEL OF A PREPRESSED CONCRETE BODY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2838638 1978-09-05
DE2838638A DE2838638C2 (en) 1978-09-05 1978-09-05 Closure for a clamping channel of a prestressed concrete body

Publications (2)

Publication Number Publication Date
EP0009607A1 EP0009607A1 (en) 1980-04-16
EP0009607B1 true EP0009607B1 (en) 1981-09-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP79103113A Expired EP0009607B1 (en) 1978-09-05 1979-08-24 Closure for a pre-stress channel of a pre-stressed concrete element

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EP (1) EP0009607B1 (en)
AT (1) ATE265T1 (en)
DE (1) DE2838638C2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2151533A (en) * 1983-12-16 1985-07-24 Natenco Automation & Robotics Pressing products from water- solid mixtures
WO2024086859A1 (en) * 2022-10-19 2024-04-25 Wekaba Engineering (Pty) Ltd A sealing system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2210226C3 (en) * 1972-03-03 1981-01-15 Ernst Wilhelm 5894 Halver Steinhauer Method for completely filling a cavity in a concrete structure and devices for carrying out the method

Also Published As

Publication number Publication date
DE2838638C2 (en) 1980-07-03
EP0009607A1 (en) 1980-04-16
DE2838638B1 (en) 1979-10-18
ATE265T1 (en) 1981-10-15

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