EP0726375A1 - Modular pump with controlled injection - Google Patents

Modular pump with controlled injection Download PDF

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Publication number
EP0726375A1
EP0726375A1 EP96400253A EP96400253A EP0726375A1 EP 0726375 A1 EP0726375 A1 EP 0726375A1 EP 96400253 A EP96400253 A EP 96400253A EP 96400253 A EP96400253 A EP 96400253A EP 0726375 A1 EP0726375 A1 EP 0726375A1
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EP
European Patent Office
Prior art keywords
mixture
pump according
modular pump
conduits
closing
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Granted
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EP96400253A
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German (de)
French (fr)
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EP0726375B1 (en
Inventor
Michel Lava
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Its-Injections Et Travaux Speciaux
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Individual
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    • 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
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0203—Arrangements for filling cracks or cavities in building constructions
    • 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
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0203—Arrangements for filling cracks or cavities in building constructions
    • E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F04B13/02—Pumps specially modified to deliver fixed or variable measured quantities of two or more fluids at the same time

Definitions

  • the invention relates to a modular pump for controlled injection of clogging products in local areas of structures with water tightness defects, or in media to be stabilized.
  • the injected product is generally a mixture of several chemical constituents, in relative volumes which may be different. This mixture is injected by the pump, depending on the field of use, into non-tight expansion joints, into cracks in concrete structures such as tunnels, underground galleries, dams, cofferdams etc., or to stabilize soils.
  • Concrete structures subjected to water pressure or buried, often contain leaks such as cracks, resumption of pouring, non-tight expansion joints, coating defects of metallic building elements , porosities, nests of gravel, etc., at the level of which sealing is not ensured and where water leaks occur.
  • the pump according to the invention is also provided for injecting hydrogonflating soil stabilization products.
  • the proportions of the chemical components entering the mixture to be injected are very variable.
  • the pump is modular.
  • the two-component modular pump as shown diagrammatically in FIG. 1 comprises a carriage 1 for moving and guiding plungers 2 and 3 in cylinders 4 and 5 each provided with a special seal 6 with very low coefficient friction, excluding contact between the plunger and the cable gland.
  • the carriage 1 consists of a rigid metal plate provided with bearings 7 in which slide two guide rods in rectified treated steel, the mechanical strength of which depends on the injection pressure. These rods are fixed at their end to the frame 10 of the pump. Stops 11 and 12 limit the stroke C of the carriage 1.
  • the front and rear end positions of the carriage are controlled by electrical limit switches.
  • the carriage is moved by a displacement means which can be either a hydraulic cylinder and its control unit, or an electric cylinder, or an electromechanical means, for example with cam, crank rod, toggle lever etc., fixed on the frame 10 of the pump.
  • the plungers 2 and 3 are rigidly and precisely fixed on the carriage, parallel to the guide rods 8 and 9.
  • the cylinders 4 and 5 of the plungers are rigidly fixed on the frame 10.
  • the outlet of each cylinder 4 and 5 comprises a duct 15, 16 a non-return valve 17, 18 with its positive control means 19, 20, for closing the suction duct 21, 22, corresponding containers 23, 24 of components of the mixture to be injected.
  • the discharge conduits 25, 26 are each equipped with a non-return valve provided with a positive operating means 29, 30.
  • the positive operating means of each of the non-return valves is either hydraulic or electric, or electromechanical, or pneumatic. These positive commands permanently ensure the precision and reliability of the volumetric metering of each of the components entering the mixture.
  • each pump includes means for controlling the injection pressure, controlling the flow rate of each injection cylinder, controlling the quality of the mixture, even with more than two components, regardless of the deviation from viscosity of said components of the mixture. These characteristics ensure maximum quality of injection of the sealing mixture.
  • the mixing takes place in a collecting part 35 to which the discharge conduits 36, 37 are connected.
  • the collecting piece 35 is provided with an adjustable thermostatically controlled heating means for controlling the setting time, and with a closing tap.
  • a quick connector 38 is provided to connect to the outlet of the collecting piece 35, this connector is mounted on a flexible hydraulic hose 39 at very high pressure, at the other end of which is mounted, also with a quick connector, a nozzle injection provided with an expandable seal 40 of known type expanding in an access hole drilled in the crack or in the access to the area to be sealed.
  • the remote control is carried out by means of a not shown console, connected by an electric cable to the various organs of the pump to be controlled and / or controlled. This pump works as follows: Several holes are drilled at different places in the crack to be filled. Then introduced and blocked an injection nozzle with its seal 40 in each of these holes.
  • the pump When the pressurized sealant begins to drool at the edge of the slot, the pump is stopped instantly by ceasing to press the control button.
  • the quick coupling engaged in the nozzle is disconnected and immediately connected to the second nozzle, the injection cycles of the mixture are thus restarted on each of the following nozzles which are left in their hole.
  • FIG. 2 presents a diagram on which two separate pumps 50 and 51 are assembled. They each have their own carriage and a single plunger 54 and 55 with its cylinder 56, 57.
  • the piston 55 has been shown larger than the piston 54 so as to deliver a larger volume in the case where the percentage of the two products entering the mixture is different.
  • the pump according to the invention is modular in the sense that the pistons and their cylinder are assembled as a function of the flow rates requested according to the type of mixture used for a given site.
  • the two single piston pumps are assembled by flanges 60 for fixing arranged between their respective frames.
  • the mixture comprises three components
  • three custom-made monopiston pumps are assembled, as shown diagrammatically in FIG. 2, by means of flanges 60 fixed between their frames, at the volume and flow rate corresponding to each of the components of said mixture, said flow rates being adjusted, to each pump, by means of electronic variation of the speed of movement of the corresponding carriage.
  • the diameter of the plungers is adapted to the corresponding flow rate of each pump.
  • injecting a water-swelling product is exemplary.
  • the percentage of each of the components of the water-swelling mixes is very variable. This application requires the custom assembly of a pump according to the volumes to be distributed for each of the components. The flow will be essential compared to the pressure which will be less.
  • FIGS. 3 and 4 show an exemplary embodiment of a pump for injecting sealants according to the invention, in elevation section passing through the actuating cylinder D of the carriage 1, FIG. 3 (top view), and in section in elevation ( Figure 4) by one of the carriage guide rods, by one of the metering pistons 2, 3 and by one of the discharge valves.
  • the same reference numbers as in the diagram in Figure 1 were used. It can be seen that the guidance of the carriage 1 on the rectified cylindrical rods 8, 9 does not risk causing stress on the metering pistons 2, 3.
  • the suction check valves 17, 18 are each returned to the closure by an oversized spring to obtain a good seal. They are opened positively by the rod 62 of a hydraulic cylinder 63.
  • the non-return valves 27, 28 for delivery are closed by a spring. It is also possible to pilot this valve positively as mentioned in the description of FIG. 1.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Catching Or Destruction (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Coating Apparatus (AREA)
  • Nozzles (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Special Spraying Apparatus (AREA)

Abstract

The pump includes a carriage (1) movable along a frame (10). The carriage provides linear displacement and guidance of pistons (2,3) in cylinders (4, 5) each equipped with a seal (6). A duct (15, 16) is provided at the outlet of each cylinder with a non-return valve (17, 18) for closing the suction pipe (21, 22) of a container (23, 24) filled-up with a filling-up mixture. Return pipes (25, 26) are equipped with non-return valves (27, 28) and positive controls (29, 30). The pipes lead into a collector (35) with a rapid connector (38) to a flexible hydraulic hose (39). The carriage may be moved using an electric or electro-mechanic driving system.

Description

L'invention concerne une pompe modulaire d'injection contrôlée, de produits de colmatage, dans des zones locales d'ouvrages présentant des défauts d'étanchéité à l'eau, ou dans des milieux à stabiliser. Le produit injecté est généralement un mélange de plusieurs constituants chimiques, dans des volumes relatifs pouvant être différents. Ce mélange est injecté par la pompe, selon le domaine d'utilisation, dans des joints de dilatation non étanches, dans des fissures d'ouvrages en béton tels que tunnels, galeries souterraines, barrages, batardeaux etc., ou pour stabiliser des sols.The invention relates to a modular pump for controlled injection of clogging products in local areas of structures with water tightness defects, or in media to be stabilized. The injected product is generally a mixture of several chemical constituents, in relative volumes which may be different. This mixture is injected by the pump, depending on the field of use, into non-tight expansion joints, into cracks in concrete structures such as tunnels, underground galleries, dams, cofferdams etc., or to stabilize soils.

Les ouvrages en béton, soumis à une pression d'eau ou enterrés, comportent souvent des défauts d'étanchéité tels que des fissures, des reprises de coulée, des joints de dilatation non étanches, des défauts d'enrobage d'éléments métalliques de construction, des porosités, des nids de gravier, etc., au niveau desquels l'étanchéité n'est pas assurée et où se produisent des fuites d'eau.Concrete structures, subjected to water pressure or buried, often contain leaks such as cracks, resumption of pouring, non-tight expansion joints, coating defects of metallic building elements , porosities, nests of gravel, etc., at the level of which sealing is not ensured and where water leaks occur.

Pour assurer l'étanchéité de ces zones locales défectueuses, particulièrement lorsque les fuites liquides sont soumises à une pression et/ou ont un débit élevé, il n'est pas possible d'utiliser du ciment ou du béton pour obturer les zones de fuites. Le temps de prise en masse du béton ou du ciment est trop long pour permettre l'obturation de telles fuites. Dans le cas ou malgré tout on obtiendrait un colmatage des fuites avec ces matériaux, ce colmatage serait rigide et se casserait rapidement par suite des mouvements de sol, des dilatations ou contractions dues aux différences de températures.To seal these defective local areas, particularly when liquid leaks are subjected to pressure and / or have a high flow rate, it is not possible to use cement or concrete to seal the leak areas. The setting time of concrete or cement is too long to allow the sealing of such leaks. In the case where, despite everything, a leakage plugging with these materials is obtained, this plugging would be rigid and would break quickly due to ground movements, expansions or contractions due to temperature differences.

Il est connu d'employer deux produits chimiques, mélangés au moment de l'utilisation, pour obtenir une résine élastique injectée avec une machine hydraulique légère et robuste comme décrite dans le brevet FR 2 553 304, pouvant être commandée à distance. Cette machine est actuellement la plus évoluée parmi les matériels actuellement utilisés pour effectuer ce genre d'opérations de colmatage.
Elle se compose d'un groupe hydraulique électrique actionnant un vérin à double effet relié à deux pistons logés dans deux cylindres, dont les sorties, reliées par des conduits séparés, raccordés respectivement à des conteneurs de deux produits chimiques à mélanger au moment de l'injection dans les fissures des ouvrages en béton. Cette disposition permet d'avoir des temps de prise très court.It is known to use two chemicals, mixed at the time of use, to obtain an elastic resin injected with a light and robust hydraulic machine as described in patent FR 2,553,304, which can be controlled remotely. This machine is currently the most advanced among the materials currently used to perform this type of clogging operation.
It consists of an electric hydraulic group actuating a double-acting cylinder connected to two pistons housed in two cylinders, the outputs of which, connected by separate conduits, connected respectively to containers of two chemicals to be mixed at the time of injection into cracks in concrete structures. This arrangement allows very short setting times.

Les machines réalisées conformément à ce brevet présentent les importants défauts suivants:

  • 1) La conception de la commande des vérins d'injection engendre une différence de pression entre les deux pistons. La barre de poussée des deux tiges de piston des vérins se met de travers et occasionne le coincement desdites tiges, ainsi que des efforts radiaux anormaux sur lesdites tiges de piston de refoulement des produits chimiques à mélanger.
  • 2) Le frottement de la tige de guidage du piston des vérins d'injection augmente dans le presse-étoupe. Il en résulte un broutement dans le déplacement de la tige des vérins qui s'use rapidement, détériore son état de surface et réduit la durée de vie du joint d'étanchéité.
  • 3) Le joint d'étanchéité des pistons se détériore également et cause une fuite non détectable du produit injecté. Cette fuite fait varier les proportions entre les deux produits à mélanger et affecte la qualité du mélange et par suite celle de l'étanchéité recherchée par le colmatage dans le béton.
  • 4) Lorsque l'on aspire le produit à injecter, le clapet 37 s'ouvre, mais son ressort de fermeture et/ou le poids qui plaquait la bille contre son siège, créent une perte de charge qui affecte encore le dosage du mélange. Si le ressort de fermeture est trop faible, la perte de charge est faible, mais il referme mal le clapet. Si le ressort est trop fort, le clapet se ferme bien, mais provoque une perte de charge à l'aspiration et une cavitation.
  • 5) L'impossibilité de modifier le dosage volumique de chacun des deux produits l'un par rapport à l'autre.
The machines produced in accordance with this patent have the following major defects:
  • 1) The design of the injection cylinder control generates a pressure difference between the two pistons. The push bar of the two piston rods of the cylinders is skewed and causes the jamming of said rods, as well as abnormal radial forces on said piston rods for discharging the chemicals to be mixed.
  • 2) The friction of the piston guide rod of the injection cylinders increases in the stuffing box. This results in chatter in the movement of the cylinder rod which wears out quickly, deteriorates its surface condition and reduces the life of the seal.
  • 3) The piston seal also deteriorates and causes an undetectable leak of the injected product. This leak varies the proportions between the two products to be mixed and affects the quality of the mixture and consequently that of the seal sought by clogging in the concrete.
  • 4) When the product to be injected is sucked in, the valve 37 opens, but its closing spring and / or the weight which pressed the ball against its seat, create a pressure drop which again affects the dosage of the mixture. If the closing spring is too weak, the pressure drop is low, but it does not close the valve properly. If the spring is too strong, the valve closes well, but causes a loss of suction pressure and cavitation.
  • 5) The impossibility of modifying the volume dosage of each of the two products in relation to each other.

Ces inconvénients mécaniques ne permettent pas de garantir la qualité de l'étanchéité du colmatage effectué avec cette machine à cause de l'absence de maîtrise des conditions de dosage volumique des deux produits constituant le mélange à injecter. La recherche de qualité des travaux est de plus en plus demandée. Les produits entrant dans la composition des mélanges de résines élastiques évoluent continuellement. Pour obtenir de bons résultats dans le temps, il est impératif de bien respecter les dosages volumiques de chacun des produits du mélange à injecter dans les fissures pour obtenir un produit de colmatage homogène et de caractéristiques constantes. Ces dosages peuvent être différents d'un mélange à l'autre selon la nature des constituants entrant dans le mélange. Il est donc important de pouvoir faire varier le réglage du volume de chacun des produits pour constituer le mélange spécifique que l'on veut obtenir. Dans certains cas on peut avoir à constituer un mélange à trois composants, voire davantage. Il n'est pas possible de préparer des mélanges à l'avance, car ceux-ci doivent être à prise très rapide pour pouvoir arrêter immédiatement de très gros débits de fuite. Ils ne peuvent donc être effectués qu'au moment de l'injection.These mechanical drawbacks do not make it possible to guarantee the quality of the sealing of the clogging carried out with this machine because of the lack of control of the volume metering conditions of the two products constituting the mixture to be injected. The search for quality work is increasingly demanded. The products used in the composition of mixtures of elastic resins are constantly evolving. To obtain good results over time, it is imperative to respect the volume dosages of each of the products of the mixture to be injected into the cracks in order to obtain a homogeneous sealing product with constant characteristics. These dosages can be different from one mixture to another depending on the nature of the constituents entering the mixture. It is therefore important to be able to vary the volume setting of each of the products to constitute the specific mixture that one wants to obtain. In some cases it may be necessary to constitute a mixture with three components, or even more. It is not possible to prepare mixtures in advance, as these must be set very quickly to be able to immediately stop very large leak rates. They can therefore only be carried out at the time of injection.

La présente invention a pour objet de résoudre complètement les inconvénients exposés ci-dessus et d'apporter des possibilités nouvelles aux opérateurs ayant à intervenir sur ce type de chantiers. La continuité de la qualité des étanchéités obtenues avec la pompe selon l'invention est assurée par la résolution des problèmes suivants:

  • injection d'un mélange bi ou tri composant, à temps de prise très court, sans aucune préparation, dès la première seconde de mise en oeuvre;
  • contrôle de la pression d'injection;
  • contrôle très précis du débit volumétrique de chaque cylindre d'injection assurant la qualité du mélange, même à plus de deux composants, quelle que soit l'écart de viscosité des composants du mélange;
  • guidage du chariot sans déformation élastique pour travailler à haute pression (300 à 400 bars ou plus si c'est nécessaire) sans provoquer de contraintes sur les plongeurs assurant le dosage.
  • Contrôle des positions d'ouverture et de fermeture des clapets d'aspiration et de refoulement de chacun des composants entrant dans le mélange à injecter.
The object of the present invention is to completely resolve the drawbacks set out above and to provide new possibilities for operators having to work on this type of site. The continuity of the quality of the seals obtained with the pump according to the invention is ensured by solving the following problems:
  • injection of a two- or three-component mixture, with very short setting time, without any preparation, from the first second of implementation;
  • injection pressure control;
  • very precise control of the volumetric flow rate of each injection cylinder ensuring the quality of the mixture, even with more than two components, whatever the difference in viscosity of the components of the mixture;
  • guide the carriage without elastic deformation to work at high pressure (300 to 400 bar or more if necessary) without causing stress on the plungers ensuring the metering.
  • Control of the opening and closing positions of the suction and discharge valves of each of the components entering the mixture to be injected.

La pompe selon l'invention est également prévue pour injecter des produits hydrogonflants de stabilisation des sols. Dans ce cas, les proportions des composants chimiques entrant dans le mélange à injecter sont très variables. La pompe est constituée de façon modulaire..The pump according to the invention is also provided for injecting hydrogonflating soil stabilization products. In this case, the proportions of the chemical components entering the mixture to be injected are very variable. The pump is modular.

L'invention est décrite en détail dans le texte qui suit, en référence aux dessins annexés, donnés à titre non limitatif et montrant:

  • figure 1, un schéma d'une pompe modulaire selon l'invention, d'injection bi-composants à volume identique;
  • figure 2, un schéma d'une pompe modulaire selon l'invention, d'injection bi-composants à volume différents;
  • figure 3 et 4 un exemple de réalisation de pompe modulaire selon la figure 1.
The invention is described in detail in the following text, with reference to the accompanying drawings, given without limitation and showing:
  • Figure 1, a diagram of a modular pump according to the invention, two-component injection at identical volume;
  • FIG. 2, a diagram of a modular pump according to the invention, of two-component injection at different volumes;
  • FIGS. 3 and 4 an exemplary embodiment of a modular pump according to FIG. 1.

La pompe modulaire bi-composants telle que montrée schématiquement sur la figure 1 comporte un chariot 1 de déplacement et de guidage de pistons plongeurs 2 et 3 dans des cylindres 4 et 5 munis chacun d'un joint 6 d'étanchéité spécial à très bas coefficient de frottement, excluant les contacts entre le plongeur et le presse-étoupe.
Le chariot 1 est constitué d'une plaque métallique rigide munie de paliers 7 dans lesquels coulissent deux tiges de guidage en acier traité rectifié, dont la résistance mécanique est fonction de la pression d'injection. Ces tiges sont fixées à leur extrémité sur le bâti 10 de la pompe.
Des butées 11 et 12 limitent la course C du chariot 1. Les fins de course avant et arrière du chariot sont contrôlées par des capteurs électriques de fin de course. Le chariot est mû par un moyen de déplacement qui peut être soit un vérin hydraulique et sa centrale de commande, soit un vérin électrique, soit un moyen électromécanique, par exemple à came, à bielle manivelle, à genouillère etc., fixé sur le bâti 10 de la pompe.The two-component modular pump as shown diagrammatically in FIG. 1 comprises a carriage 1 for moving and guiding plungers 2 and 3 in cylinders 4 and 5 each provided with a special seal 6 with very low coefficient friction, excluding contact between the plunger and the cable gland.
The carriage 1 consists of a rigid metal plate provided with bearings 7 in which slide two guide rods in rectified treated steel, the mechanical strength of which depends on the injection pressure. These rods are fixed at their end to the frame 10 of the pump.
Stops 11 and 12 limit the stroke C of the carriage 1. The front and rear end positions of the carriage are controlled by electrical limit switches. The carriage is moved by a displacement means which can be either a hydraulic cylinder and its control unit, or an electric cylinder, or an electromechanical means, for example with cam, crank rod, toggle lever etc., fixed on the frame 10 of the pump.

Les pistons plongeurs 2 et 3 sont fixés rigidement et avec précision sur le chariot, parallèlement aux tiges de guidage 8 et 9. Les cylindres 4 et 5 des pistons plongeurs sont fixés rigidement sur le bâti 10. La sortie de chaque cylindre 4 et 5 comporte un conduit 15, 16 un clapet anti-retour 17, 18 avec son moyen de commande positive 19, 20, pour fermer le conduit d'aspiration 21, 22, des conteneurs 23, 24 correspondants de composants du mélange à injecter. Les conduits de refoulement 25, 26 sont équipés chacun d'un clapet anti-retour muni d'un moyen de manoeuvre positive 29, 30. Le moyen de manoeuvre positif de chacun des clapets anti-retour est, soit hydrauliques, soit électrique, soit électromécaniques, soit pneumatiques. Ces commandes positives permettent d'assurer en permanence la précision et la fiabilité du dosage volumétrique de chacun des composants entrant dans le mélange. Le fait qu'il n'y ait pas de contact entre les pistons plongeurs 2 et 3 et leur presse-étoupe, grâce aux joints spéciaux d'étanchéité 6 à très bas coefficient de frottement et que le guidage des chariots soit très précis et robuste, sans flexion, confère à la pompe selon l'invention, une grande précision des dosages et une grande longévité. De plus, chaque pompe comporte des moyens de contrôle de la pression d'injection, de contrôle du débit de chaque cylindre d'injection, de contrôle de la qualité du mélange, même à plus de deux composants, quelle que soit l'écart de viscosité desdits composants du mélange.
Ces caractéristiques permettent d'assurer une qualité maximale d'injection du mélange de colmatage. Le mélange s'effectue dans une pièce collectrice 35 à laquelle les conduits de refoulement 36, 37 sont connectés. La pièce collectrice 35 est munie d'un moyen de chauffage thermostaté réglable pour contrôler le temps de prise, et d'un robinet de fermeture. Un raccord rapide 38 est prévu pour se connecter à la sortie de la pièce collectrice 35, ce raccord est monté sur un tuyau hydraulique souple 39 à très haute pression, à l'autre extrémité duquel est montée, également avec un raccord rapide, une buse d'injection munie d'un joint expansible 40 de type connu s'expansant dans un trou d'accès percé dans la fissure ou dans l'accès à la zone à colmater. La commande à distance est effectuée au moyen d'un pupitre non représenté, relié par un câble électrique aux différents organes de la pompe à contrôler et/ou commander. Cette pompe fonctionne de la façon suivante: On perce plusieurs trous en différents endroits de la fissure à colmater.
On introduit et bloque ensuite une buse d'injection avec son joint 40 dans chacun de ces trous. On connecte ensuite le raccord rapide d'extrémité du tuyau hydraulique souple 39 sur une premiere buse et à partir du pupitre de commande de la pompe, on appuie sur le bouton de commande du moyen de déplacement D (vérin électrique ou autre) en commandant, d'abord en continu, puis au coup par coup, une succession de cycles aller-retour des pistons doseurs qui aspirent chacun une dose de produit dans leur conteneur respectif 23, 24, les clapets 17, 18 étant ouverts, puis refoulent le produit en fermant les clapets 17, 18 et ouvrant les clapets 27, 28. Le produit refoulé dans chacun des conduits 36, 37 va se mélanger dans la pièce collectrice 35, puis le mélange ainsi constitué au dernier moment, est introduit dans la fissure au travers du tube 39 et de la buse portant le joint 40. Lorsque le produit de colmatage sous pression commence à baver au bord de la fente, on arrête la pompe instantanément en cessant d'appuyer sur le bouton de commande. On déconnecte le raccord rapide engagé dans la buse et on le connecte aussitôt sur la seconde buse, on recommence ainsi les cycles d'injection du mélange sur chacune des buses suivantes qui sont abandonnées dans leur trou.The plungers 2 and 3 are rigidly and precisely fixed on the carriage, parallel to the guide rods 8 and 9. The cylinders 4 and 5 of the plungers are rigidly fixed on the frame 10. The outlet of each cylinder 4 and 5 comprises a duct 15, 16 a non-return valve 17, 18 with its positive control means 19, 20, for closing the suction duct 21, 22, corresponding containers 23, 24 of components of the mixture to be injected. The discharge conduits 25, 26 are each equipped with a non-return valve provided with a positive operating means 29, 30. The positive operating means of each of the non-return valves is either hydraulic or electric, or electromechanical, or pneumatic. These positive commands permanently ensure the precision and reliability of the volumetric metering of each of the components entering the mixture. The fact that there is no contact between the plungers 2 and 3 and their cable gland, thanks to the special seals 6 with very low coefficient of friction and that the guidance of the carriages is very precise and robust , without bending, gives the pump according to the invention, great metering precision and a long service life. In addition, each pump includes means for controlling the injection pressure, controlling the flow rate of each injection cylinder, controlling the quality of the mixture, even with more than two components, regardless of the deviation from viscosity of said components of the mixture.
These characteristics ensure maximum quality of injection of the sealing mixture. The mixing takes place in a collecting part 35 to which the discharge conduits 36, 37 are connected. The collecting piece 35 is provided with an adjustable thermostatically controlled heating means for controlling the setting time, and with a closing tap. A quick connector 38 is provided to connect to the outlet of the collecting piece 35, this connector is mounted on a flexible hydraulic hose 39 at very high pressure, at the other end of which is mounted, also with a quick connector, a nozzle injection provided with an expandable seal 40 of known type expanding in an access hole drilled in the crack or in the access to the area to be sealed. The remote control is carried out by means of a not shown console, connected by an electric cable to the various organs of the pump to be controlled and / or controlled. This pump works as follows: Several holes are drilled at different places in the crack to be filled.
Then introduced and blocked an injection nozzle with its seal 40 in each of these holes. Then connect the quick connector at the end of the flexible hydraulic hose 39 to a first nozzle and from the pump control panel, press the control button for the displacement means D (electric actuator or other) while commanding, first continuously, then piecemeal, a succession of round-trip cycles of the metering pistons which each suck up a dose of product in their respective container 23, 24, the valves 17, 18 being open, then discharge the product in closing the valves 17, 18 and opening the valves 27, 28. The product discharged into each of the conduits 36, 37 will mix in the collecting piece 35, then the mixture thus formed at the last moment, is introduced into the crack through the tube 39 and the nozzle carrying the seal 40. When the pressurized sealant begins to drool at the edge of the slot, the pump is stopped instantly by ceasing to press the control button. The quick coupling engaged in the nozzle is disconnected and immediately connected to the second nozzle, the injection cycles of the mixture are thus restarted on each of the following nozzles which are left in their hole.

La figure 2 présente un schéma sur lequel deux pompes 50 et 51 séparées, sont assemblées. Elles ont chacune leur propre chariot et un seul piston-plongeur 54 et 55 avec son cylindre 56, 57.
Le piston 55 a été représenté plus gros que le piston 54 de façon à débiter un volume plus important dans le cas ou le pourcentage des deux produits entrant dans le mélange est différent. La pompe selon l'invention est modulaire en ce sens que les pistons et leur cylindre sont assemblés en fonction des débits demandés suivant le type de mélange utilisé pour un chantier donné. Les deux pompes monopiston sont assemblées par de brides 60 de fixation disposées entre leur bâti respectifs.FIG. 2 presents a diagram on which two separate pumps 50 and 51 are assembled. They each have their own carriage and a single plunger 54 and 55 with its cylinder 56, 57.
The piston 55 has been shown larger than the piston 54 so as to deliver a larger volume in the case where the percentage of the two products entering the mixture is different. The pump according to the invention is modular in the sense that the pistons and their cylinder are assembled as a function of the flow rates requested according to the type of mixture used for a given site. The two single piston pumps are assembled by flanges 60 for fixing arranged between their respective frames.

Si le mélange comporte trois composants, on assemble, comme montré schématiquement figure 2, trois pompes monopiston sur mesure, au moyen de brides 60 fixées entre leurs bâti, au volume et débit correspondant à chacun des composants dudit mélange, lesdits débits étant ajustés, pour chaque pompe, par un moyen de variation électronique de la vitesse de déplacement du chariot correspondant. Le diamètre des pistons-plongeurs est adapté au débit correspondant de chaque pompe.
Le cas des pompes de stabilisation des sols, injectant un produit hydrogonflant est exemplaire. Le pourcentage de chacun des composants des mélanges hydrogonflants est très variable. Cette application nécessite l'assemblage sur mesure d'une pompe en fonction des volumes à distribuer pour chacun des composants.
Le débit sera primordial par rapport à la pression qui sera moindre.If the mixture comprises three components, three custom-made monopiston pumps are assembled, as shown diagrammatically in FIG. 2, by means of flanges 60 fixed between their frames, at the volume and flow rate corresponding to each of the components of said mixture, said flow rates being adjusted, to each pump, by means of electronic variation of the speed of movement of the corresponding carriage. The diameter of the plungers is adapted to the corresponding flow rate of each pump.
The case of soil stabilization pumps, injecting a water-swelling product is exemplary. The percentage of each of the components of the water-swelling mixes is very variable. This application requires the custom assembly of a pump according to the volumes to be distributed for each of the components.
The flow will be essential compared to the pressure which will be less.

Les figures 3 et 4 montrent un exemple de réalisation d'une pompe d'injection de produits de colmatage selon l'invention, en coupe en élévation passant par le vérin D de manoeuvre du chariot 1, figure 3 (vue de dessus), et en coupe en élévation (figure 4) par une des tiges de guidage du chariot, par un des pistons-doseurs 2, 3 et par un des clapets de refoulement. Les mêmes numéros de repères que sur le schéma de la figure 1 ont été utilisés. On voit que le guidage du chariot 1 sur les tiges cylindriques rectifiées 8, 9, ne risque pas de provoquer de contraintes sur les pistons-doseurs 2, 3.
Les clapets anti-retour d'aspiration 17, 18 sont rappelés chacun à la fermeture par un ressort surdimensionné pour obtenir une bonne étanchéité. Ils sont ouverts positivement par la tige 62 d'un vérin hydraulique 63. Les clapets anti-retour 27, 28 de refoulement sont fermés par un ressort. On peut également piloter positivement ce clapet comme mentionné dans la description de la figure 1.FIGS. 3 and 4 show an exemplary embodiment of a pump for injecting sealants according to the invention, in elevation section passing through the actuating cylinder D of the carriage 1, FIG. 3 (top view), and in section in elevation (Figure 4) by one of the carriage guide rods, by one of the metering pistons 2, 3 and by one of the discharge valves. The same reference numbers as in the diagram in Figure 1 were used. It can be seen that the guidance of the carriage 1 on the rectified cylindrical rods 8, 9 does not risk causing stress on the metering pistons 2, 3.
The suction check valves 17, 18 are each returned to the closure by an oversized spring to obtain a good seal. They are opened positively by the rod 62 of a hydraulic cylinder 63. The non-return valves 27, 28 for delivery are closed by a spring. It is also possible to pilot this valve positively as mentioned in the description of FIG. 1.

Claims (20)

Pompe modulaire d'injection contrôlée, d'un produit de colmatage formé par un mélange de deux produits chimiques appropriés, dans des fissures ou solutions de continuité existantes ou se produisant notamment dans des parois d'ouvrages en béton, soumis en permanence à des pressions hydrauliques, ladite pompe comportant un groupe hydraulique moteur relié par des conduits séparés, eux-mêmes raccordés à des conteneurs des différents produits, à un système tubulaire d'injection apte à être inséré de façon amovible ou non, dans les fissures des ouvrages en béton et dans lequel le mélange approprié s'effectue au moment du refoulement des deux constituants dans le système tubulaire sous la commande hydraulique du groupe moteur commandant un premier vérin à double effet poussant en palonnier, une barre déplaçant le piston de deux vérins dont les sorties de refoulement débouchent dans deux conduits souples (15, 16) reliés à deux conteneurs (23, 24) desdits produits et raccordés au système tubulaire d'injection. Des clapets anti-retour (17, 18-27, 28) sont montés respectivement dans lesdits conduits de liaison des conteneurs aux conduits souples partant des cylindres des pistons, ainsi que dans lesdits conduits souples, caractérisé en ce que ladite pompe modulaire comporte un chariot (1) de déplacement linéaire et de guidage de pistons plongeurs (2 et 3) dans des cylindres (4 et 5) munis chacun d'un joint (6) d'étanchéité spécial à très bas coefficient de frottement, excluant les contacts entre le plongeur et le presse-étoupe, en ce que ledit chariot comporte un moyen (D) de déplacement linéaire, fixé sur le bâti (10), en ce que les clapets anti-retour (17, 18) des conduits (15, 16) placé à la sortie de chaque cylindre (4 et 5), sont munis chacun d'un moyen de commande positive (19, 20), pour fermer le conduit d'aspiration (21, 22) du conteneur (23, 24) de composant du mélange à injecter, en ce que les clapets anti-retour (27, 28) équipant les conduits de refoulement (25, 26), sont munis chacun d'un moyen de commande positive (29, 30), en ce que la pompe comporte en outre des moyens de contrôle du débit de chaque cylindre d'injection, de contrôle de la qualité du mélange, même à plus de deux composants, quelle que soit l'écart de viscosité des composants du mélange.Modular pump for controlled injection, of a clogging product formed by a mixture of two appropriate chemicals, in cracks or solutions of continuity existing or occurring in particular in walls of concrete structures, permanently subjected to pressures hydraulic, said pump comprising a hydraulic power unit connected by separate conduits, themselves connected to containers of the various products, with a tubular injection system capable of being inserted in a removable manner or not, in the cracks of the concrete structures and in which the appropriate mixing takes place at the time of the delivery of the two constituents into the tubular system under the hydraulic control of the engine group controlling a first double-acting cylinder pushing in rudder, a bar moving the piston of two cylinders whose outputs of delivery lead into two flexible conduits (15, 16) connected to two containers (23, 24) of said products its and connected to the tubular injection system. Non-return valves (17, 18-27, 28) are mounted respectively in said container connecting conduits to the flexible conduits starting from the cylinders of the pistons, as well as in said flexible conduits, characterized in that said modular pump comprises a carriage (1) for linear movement and for guiding plungers (2 and 3) in cylinders (4 and 5) each provided with a special seal (6) with very low coefficient of friction, excluding contacts between the plunger and the cable gland, in that said carriage comprises a means (D) of linear displacement, fixed on the frame (10), in that the non-return valves (17, 18) of the conduits (15, 16) placed at the outlet of each cylinder (4 and 5), are each provided with a positive control means (19, 20), for closing the suction duct (21, 22) of the container (23, 24) of component of the mixture to be injected, in that the non-return valves (27, 28) equipping the discharge conduits (25, 26), are each provided with a positive control means (29, 30), in that the pump also comprises means for controlling the flow rate of each injection cylinder, for controlling the quality of the mixture, even at more than two components, regardless of the viscosity difference of the components of the mixture. Pompe modulaire selon la revendication 1, caractérisée en ce que le chariot (1) est constitué d'une plaque métallique rigide munie de paliers (7) dans lesquels coulissent deux tiges de guidage (8, 9) en acier traité rectifié, fixées à leur extrémité sur un bâti (10).Modular pump according to claim 1, characterized in that the carriage (1) consists of a rigid metal plate provided with bearings (7) in which two guide rods (8, 9) of rectified treated steel slide, fixed to their end on a frame (10). Pompe modulaire selon les revendications 1 et 2, caractérisée en ce que le moyen (D) de déplacement du chariot guidé (1) est un vérin hydraulique à double effet.Modular pump according to claims 1 and 2, characterized in that the means (D) for moving the guided carriage (1) is a double-acting hydraulic cylinder. Pompe modulaire selon les revendications 1 et 2, caractérisée en ce que le moyen (D) de déplacement du chariot guidé (1) est un vérin pneumatique.Modular pump according to Claims 1 and 2, characterized in that the means (D) for moving the guided carriage (1) is a pneumatic cylinder. Pompe modulaire selon les revendications 1 et 2, caractérisée en ce que le moyen (D) de déplacement du chariot guidé (1) est un vérin électrique.Modular pump according to claims 1 and 2, characterized in that the means (D) for moving the guided carriage (1) is an electric actuator. Pompe modulaire selon les revendications 1 et 2, caractérisée en ce que le moyen de déplacement du chariot (1) est électromécanique.Modular pump according to claims 1 and 2, characterized in that the means for moving the carriage (1) is electromechanical. Pompe modulaire selon la revendication 1, comportant des clapets (17, 18 - 27, 28) d'ouverture et de fermeture des conduits d'aspiration et des conduits de refoulement des constituants du mélange à injecter, caractérisée en ce que ces clapets sont commandés chacun par un moyen de déplacement apte à assurer positivement la course juste nécessaire d'ouverture et de fermeture.Modular pump according to claim 1, comprising valves (17, 18 - 27, 28) for opening and closing the suction conduits and discharge conduits of the constituents of the mixture to be injected, characterized in that these valves are controlled each by a displacement means capable of ensuring positively the just necessary opening and closing stroke. Pompe modulaire selon les revendications 1, et 7, comportant des clapets (17, 18 - 27, 28) d'ouverture et de fermeture des conduits d'aspiration et de refoulement des constituants du mélange à injecter, caractérisée en ce que ces clapets sont du type à glace genre tiroir.Modular pump according to Claims 1 and 7, comprising valves (17, 18 - 27, 28) for opening and closing the suction and discharge conduits of the constituents of the mixture to be injected, characterized in that these valves are drawer type ice cream. Pompe modulaire selon les revendications 1 et 7, comportant des clapets (17, 18 - 27, 28) d'ouverture et de fermeture des conduits d'aspiration et de refoulement des constituants du mélange à injecter, caractérisée en ce que ces clapets sont du type rotatif à glace.Modular pump according to claims 1 and 7, comprising valves (17, 18 - 27, 28) for opening and closing the suction and delivery conduits of the constituents of the mixture to be injected, characterized in that these valves are rotary type ice. Pompe modulaire selon les revendications 1 et 7, comportant des clapets (17, 18 - 27, 28) d'ouverture et de fermeture des conduits d'aspiration et de refoulement des constituants du mélange à injecter, caractérisée en ce que ces clapets sont du type rotatif à tiroir.Modular pump according to Claims 1 and 7, comprising valves (17, 18 - 27, 28) for opening and closing the suction and delivery conduits of the constituents of the mixture to be injected, characterized in that these valves are rotary type with drawer. Pompe modulaire selon les revendications 1 et 7, caractérisée en ce que le moyen (19, 20 - 29, 30) de manoeuvre positive du moyen (17, 18 - 27, 28) d'ouverture et de fermeture des conduits d'aspiration et de refoulement des constituants du mélange à injecter, est hydraulique.Modular pump according to claims 1 and 7, characterized in that the means (19, 20 - 29, 30) for positive actuation of the means (17, 18 - 27, 28) for opening and closing the suction conduits and delivery of the constituents of the mixture to be injected, is hydraulic. Pompe modulaire selon l'une quelconque des revendications 7 à 10, caractérisée en ce que le moyen (19, 20, 29, 30) de manoeuvre positive du clapet (17, 18 - 27, 28) d'ouverture et de fermeture des conduits d'aspiration et de refoulement des constituants du mélange à injecter, est électromécanique.Modular pump according to any one of Claims 7 to 10, characterized in that the means (19, 20, 29, 30) for positive actuation of the valve (17, 18 - 27, 28) for opening and closing the conduits of suction and delivery of the constituents of the mixture to be injected, is electromechanical. Pompe modulaire selon l'une quelconque des revendications 7 à 10 caractérisée en ce que le moyen (19, 20, 29, 30) de manoeuvre positive du clapet (17, 18 - 27, 28) d'ouverture et de fermeture des conduits d'aspiration et de refoulement des constituants du mélange à injecter, est électrique.Modular pump according to any one of Claims 7 to 10, characterized in that the means (19, 20, 29, 30) for positive actuation of the valve (17, 18 - 27, 28) for opening and closing the conduits d he suction and discharge of the constituents of the mixture to be injected is electric. Pompe modulaire selon l'une quelconque des revendications 7 à 10, caractérisée en ce que le moyen (19, 20, 29, 30) de manoeuvre positive du moyen (17, 18 - 27, 28) d'ouverture et de fermeture des conduits d'aspiration et de refoulement des constituants du mélange à injecter, est pneumatique.Modular pump according to any one of Claims 7 to 10, characterized in that the means (19, 20, 29, 30) for positive actuation of the means (17, 18 - 27, 28) for opening and closing the conduits of suction and delivery of the constituents of the mixture to be injected, is pneumatic. Pompe modulaire selon l'une quelconque des revendications 1 à 14, caractérisée en ce que le déplacement de chacun des pistons plongeurs (54 et 55) est engendré par des chariots (54, 55), en ce que le moyen de commande de déplacement de chacun de ces deux chariots, est équipé de son propre moyen de réglage électronique de variation de vitesses de déplacement des plongeurs (54, 55) pour modifier les dosages de produits constituant le mélange de colmatage.Modular pump according to any one of Claims 1 to 14, characterized in that the displacement of each of the plungers (54 and 55) is generated by carriages (54, 55), in that the displacement control means of each of these two carriages is equipped with its own electronic adjustment means for varying the displacement speeds of the plungers (54, 55) to modify the dosages of products constituting the clogging mixture. Pompe modulaire selon les revendications 1 et 2, comportant une pièce collectrice (35) à laquelle des conduits de refoulement (36, 37) sont connectés, caractérisée en ce que ladite pièce collectrice (35) est munie d'un moyen de chauffage thermostaté et réglable pour contrôler le temps de prise.Modular pump according to claims 1 and 2, comprising a manifold (35) to which discharge conduits (36, 37) are connected, characterized in that said manifold (35) is provided with a thermostatically controlled heating means and adjustable to control setting time. Pompe modulaire selon l'une quelconque des revendications 1 et 7 à 10, caractérisée en ce que les moyens (19, 20, 29, 30) de manoeuvre des clapets d'ouverture et de fermeture positive (17, 18 - 27, 28) d'aspiration et de refoulement comportent chacun un moyen électronique de contrôle de bon positionnement d'ouverture et de fermeture.Modular pump according to any one of claims 1 and 7 to 10, characterized in that the means (19, 20, 29, 30) for operating the positive opening and closing valves (17, 18 - 27, 28) suction and discharge each include an electronic means for controlling the correct opening and closing positioning. Pompe modulaire selon l'une quelconque des revendications précédentes dans laquelle, pour l'injection d'un mélange comportant trois composants ou plus, la pompe modulaire comporte autant de cylindres d'injection que de composants à mélanger, caractérisée en ce qu'elle est constituée par l'assemblage, par leur bâti respectif de pompes mono-piston, au volume et débit correspondant à chacun des composants dudit mélange, lesdits débits étant ajustés pour chaque pompe par un moyen de variation électronique de la vitesse de déplacement du chariot (1) correspondant à chacun des pistons (54, 55).Modular pump according to any one of the preceding claims, in which, for the injection of a mixture comprising three or more components, the modular pump comprises as many injection cylinders as there are components to be mixed, characterized in that it is constituted by the assembly, by their respective frame of single-piston pumps, at the volume and flow rate corresponding to each of the components of said mixture, said flow rates being adjusted for each pump by means of electronic variation of the speed of movement of the carriage (1 ) corresponding to each of the pistons (54, 55). Pompe modulaire selon les revendications 1 et 2, caractérisée en ce que le chariot (1) est équipé de moyens de guidage sans déformation élastique pour travailler à haute pression sans provoquer de contraintes sur les plongeurs assurant le dosage du mélange à injecter.Modular pump according to claims 1 and 2, characterized in that the carriage (1) is equipped with guide means without elastic deformation to work at high pressure without causing stress on the plungers ensuring the metering of the mixture to be injected. Pompe modulaire selon les revendications 1, 2 et 16, caractérisée en ce qu'elle comporte un raccord rapide (38) se connectant à la sortie de la pièce collectrice (35), monté sur un tuyau hydraulique souple (39) à très haute pression, à l'autre extrémité duquel est monté un joint expansible (40).Modular pump according to claims 1, 2 and 16, characterized in that it comprises a quick coupling (38) connecting to the outlet of the collecting part (35), mounted on a flexible hydraulic hose (39) at very high pressure , at the other end of which is mounted an expandable seal (40).
EP96400253A 1995-02-09 1996-02-07 Modular pump with controlled injection Expired - Lifetime EP0726375B1 (en)

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FR9501493 1995-02-09
FR9501493A FR2730527B1 (en) 1995-02-09 1995-02-09 MODULAR PUMP FOR CONTROLLED INJECTION OF CLOGGING PRODUCTS IN LOCAL WORK AREAS WITH WATERTIGHT DEFECTS

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US4056258A (en) * 1975-01-15 1977-11-01 Centro Nazionale Delle Richerche Actuating device with electronic control for injectors of liquid mixers
DE2743452A1 (en) * 1976-09-28 1978-03-30 Liquid Controls Ltd DRIVE DEVICE FOR AT LEAST TWO PUMPS
DE2938840A1 (en) * 1979-09-26 1981-06-04 Schumacher, Ludger, 4354 Datteln Underground pump for impregnating minerals with polyurethane - two cylinders metering and feeding to mixer operate together
FR2553304A1 (en) * 1983-10-13 1985-04-19 Gosselin Claude Machine serving to inject an elastic plugging substance into cracks of structures having watertightness defects
WO1985003555A1 (en) * 1984-02-13 1985-08-15 Hans Jo^/Rgensen & So^/N, Entrepreno^/Rer A/S Apparatus for use in the injection or application of a filling, binding or coating composition consisting of two components
DE3523484A1 (en) * 1985-07-01 1987-01-08 Guenter Reschke High-pressure press for injecting liquid plastics in the construction field
DE3624976A1 (en) * 1986-07-24 1988-02-04 Sinsch Joachim Device for metering and transporting liquid and pasty media
DE3740857A1 (en) * 1987-12-02 1989-06-15 Siemens Ag Device for the automatic dosing and mixing of reactive resin components

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2838984A1 (en) 2002-04-25 2003-10-31 Guy Bonniot Device allowing making of sealing mixture from two products comprises base with slide and lever rotating about axis perpendicular to sliding direction, two pumps with control rods connected to lever, and inlets and discharge outlets

Also Published As

Publication number Publication date
PT726375E (en) 2002-10-31
FR2730527A1 (en) 1996-08-14
DK0726375T3 (en) 2002-09-09
ATE217933T1 (en) 2002-06-15
DE69621267T2 (en) 2003-03-27
EP0726375B1 (en) 2002-05-22
ES2177740T3 (en) 2002-12-16
DE69621267D1 (en) 2002-06-27
FR2730527B1 (en) 1997-04-30

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