摘要:
Le transporteur-malaxeur comporte un moteur (2) entraînant un compresseur d'air (3) et par l'intermédiaire d'un réducteur (4), le rotor (5) d'un malaxeur (6), le compresseur étant branché sur la cuve (8) dudit malaxeur et en aval de celle-ci, sur une tuyauterie (12) de transport du matériau raccordée à la sortie (11) de cette cuve. Selon l'invention, il comporte également au moins un organe de cadencement (28) mû par le rotor (5) et intervenant sur la distribution du matériau (16) à la tuyauterie (12) et/ou sur la distribution d'air comprimé (17) à ladite tuyauterie. Le procédé consiste à cadencer le transport dans la tuyauterie en alimentant celle-ci de façon périodique en air comprimé et/ou en matériau de façon à maîtriser l'écoulement dans la tuyauterie en formant des tronçons de matériau sensiblement homogènes séparés par des tampons d'air comprimé.
摘要:
A waterborne facility on a body of water includes a primary spoolable pipe and a pump. The end of the primary spoolable pipe may be guided from the waterborne facility to a location proximate to a selected site. The pump may be used to discharge a flowable material through the primary spoolable pipe. The waterborne facility may include a ready-mix concrete preparation system. However, the waterborne facility may deliver any flowable material to a selected site, which may be a land surface, underground, on a water surface, or underwater. Illustrative flowable materials include seawater, grout, cement, and sediment/mud.
摘要:
Disclosed are formulations adapted to form a foamed cementitious composition, the foamed cementitious composition itself, a method of forming a hydraulic binder foam, and a method of conveying and applying the resulting foam to a substrate. A pumpable cementitious slurry is formed, the slurry is mixed with a gas such as air, and is subjected to mechanically created turbulence to generate gas bubbles and create a foam, which preferably is stabilized by a foam stabilizing agent such as polyvinyl alcohol present in the slurry. The foam is then conveyed to a nozzle or other suitable dispense point from which it is applied, for example sprayed, preferably uniformly, onto a substrate to be coated. Prior to dispensing, a set accelerator is preferably injected, which causes the foam to gel, which in turn improves the hangability of the product on a substrate. The spray material adheres to the substrate and hardens to form an insulative coating on the substrate. Also disclosed are dry compositions comprising a hydratable cementitious binder, a mechanical foam stabilizing agent, and optionally a fibrous component, set retarder and air entraining agent, said composition providing, on the addition of water, gas and mechanical turbulence, a settable foam which is capable of spray application to a steel structural member and which, after spray application, is adherent to the member in the foamed state and after setting. The foam after setting, forms a fire and heat protective adherent coating on the member.
摘要:
The device comprises a portable container (1) with a support handle (2) and with a lower oblique cone (101), equipped with a discharge nozzle (3) of suitable section. The pasty product is put in said container and is delivered from the nozzle of said cone by means of a compressed-air ejector (206-13) which is controlled by a valve means (4) which is preferably located on said handle (2).
摘要:
The invention relates to a method for coating a support (2) using a lightweight insulating concrete (3), said method comprising operations consisting in: preparing the concrete (3) by mixing pre-determined ratios of at least one fibrous aggregate, a binder and water; pouring the concrete (3) thus prepared into a drum (6) equipped with at least one outlet hole; continuously circulating the wet concrete (3) through the drum (6) as far as the hole or each outlet hole; sucking the wet concrete (3) through a supply pipe (45A, 45B) that connects the outlet hole of the tank (6) to a spray nozzle (40), by means of a venturi that forms part of the spray nozzle (40) and is supplied with compressed air; and spraying the wet concrete (3) that has been sucked through the pipe onto the support (2) using the spray nozzle (40).
摘要:
Mixing apparatus comprising a batch mixing vessel (45) with an inlet (40) to receive constituent material, an agitation assembly for mixing the constituents and an outlet to convey batches of the mixed is provided. The apparatus includes means (120) for pressurizing the vessel to assist in evacuation of the mix, and a conduit (210) through which the mix is conveyed. A single pneumatic source is used both to pressurize the mixing vessel and to drive a jet pump (62) comprising the batch loading means. During the mixing cycle, the compressor used to discharge the finished mix is generally idle. It has been discovered, that this compressor can be used during these periods to drive a jet pump to load the mixing vessel. Therefore, manual loading is avoided and can be achieved such that the mixing cycle time is not interrupted.
摘要:
A spray operation method for monolithic refractories, which comprises forcibly sending to an application field by a force feed pump (1) and a force feed piping (2a,2b) a self flowable mixed batch prepared by mixing, together with water, a powder composition for monolithic refractories comprising refractory aggregates, a refractory powder and a small amount of a dispersant; injecting into the mixed batch, compressed air and a required amount of a rapid setting agent respectively from a compressed air injection inlet (10) and a rapid setting agent injection inlet (11) provided at a downstream portion or downstream portions of the force feed piping (2a,2b); sending the mixed batch together with the compressed air by a nozzle piping (3) to a spray nozzle (4) attached to the forward end of the nozzle piping (3); and spraying the mixed batch from the spray nozzle (4) to an application site.
摘要:
Um die Aufprallgeschwindigkeit der Betonmasse auf eine Wand (48) zu reduzieren, ist im Förderschlauch (12,12') eine für Druckluft bestimmte, ins Freie gerichtete Abzweigung (40) von der Spritzdüse (10) entfernt angeordnet. Diese Abzweigung weist zur Einstellung der abzuleitenden Druckluftmenge ein Ventil (42) auf. Durch die Ableitung wird der Rückprall von Betonmasse von der Wand (48) erheblich vermindert. Das Betongemisch wird vorerst auf eine konstante Feuchtigkeit vorbefeuchtet, bevor es in den Spritzweg (12, 12') gelangt und an der Spritzdüse (10) wird ihm eine konstante Restwassermenge hinzugefügt. Dieses Verfahren ergibt einen stets gleichbleibenden Wassergehalt und ermöglicht, da im Förderweg (12, 12') nur vorbefeuchtet, einen geringeren Druck der Förderluft.