WO2000032372A1 - Procede et appareil d'un systeme de pompe et de melange de beton sur rail - Google Patents

Procede et appareil d'un systeme de pompe et de melange de beton sur rail Download PDF

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Publication number
WO2000032372A1
WO2000032372A1 PCT/US1999/028291 US9928291W WO0032372A1 WO 2000032372 A1 WO2000032372 A1 WO 2000032372A1 US 9928291 W US9928291 W US 9928291W WO 0032372 A1 WO0032372 A1 WO 0032372A1
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WO
WIPO (PCT)
Prior art keywords
mixture
car
concrete
cement
mixing
Prior art date
Application number
PCT/US1999/028291
Other languages
English (en)
Other versions
WO2000032372A8 (fr
Inventor
Edwin Desteiguer Snead
Original Assignee
Edwin Desteiguer Snead
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Edwin Desteiguer Snead filed Critical Edwin Desteiguer Snead
Priority to AU21602/00A priority Critical patent/AU2160200A/en
Publication of WO2000032372A1 publication Critical patent/WO2000032372A1/fr
Publication of WO2000032372A8 publication Critical patent/WO2000032372A8/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04—Supplying or proportioning the ingredients
    • B28C7/06—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/16—Discharge means, e.g. with intermediate storage of fresh concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C9/00—General arrangement or layout of plant
    • B28C9/04—General arrangement or layout of plant the plant being mobile, e.g. mounted on a carriage or a set of carriages
    • B28C9/0472—General arrangement or layout of plant the plant being mobile, e.g. mounted on a carriage or a set of carriages provided with two or more carriages for storing the ingredients or for the mixing device, e.g. transportable on rails

Definitions

  • the present invention relates generally to a binder or adhesive material transportation system, and, more particularly, to a rail-mounted concrete mixer and pump system.
  • the train In addition to the greater amount of material that a train can carry over a dump truck in a single load, the train also has the advantage of being less subject to inclement weather conditions, that generally impede transportation by roadway. For example, rain and snow generally slow and may sometimes completely halt transportation by roadway due to unsafe driving conditions. However, since a train runs on a track, it is much less prone to the slick driving conditions often encountered via road transportation. Accordingly, rail transportation is typically more reliable than road transportation during poor weather conditions. Moreover, in many cases, access to remote locations is limited by the lack of adequate roads to the job site, thus necessitating rail travel for materials.
  • the present invention is directed to overcoming, or at least reducing the effects of, one or more of the problems set forth above.
  • the invention is a rail-mounted car for mixing and pumping binder or adhesive materials comprising a hopper to receive a cement mixture including aggregate; a screw conveyor connected to the hopper and adapted to mix the cement mixture received from the hopper with water to produce concrete; an articulated boom; and a pump adapted to pump the concrete through the boom.
  • the invention is a method for transporting binder or adhesive materials by a rail-mounted train comprising: mixing sand and gravel; heating the mixture inside a drier; weighing the mixture; adding cement to the mixture; and restricting moisture from contaminating the mixture.
  • a cement and aggregate mixture is processed prior to mixing with water to reduce its moisture content.
  • the mixture is transported in a rain-proof container car, such as a hopper car, to the desired site.
  • FIG. 1 depicts a concrete mixing and pumping system in accordance with one embodiment of the present invention
  • FIG. 2 shows the detail of a hopper car, which forms a part of the system in FIG. 1 ;
  • FIG. 3 shows a cross-sectional view of the hopper car of FIG. 2;
  • FIG. 4 depicts the detail of a material transfer car that forms a part of the system of FIG. l;
  • FIG. 5 shows a side view of the mixer car, which forms part of the system in FIG. 1 ;
  • FIG. 6 illustrates a process for producing cement at a hot mix plant in accordance with one embodiment of the present invention
  • FIG. 7 illustrates one variant of the embodiment in FIG. 6 as may be implemented with the system of FIGS. 1-5;
  • FIG. 8 illustrates a second variant of the embodiment in FIG. 6 as may be implemented with the system of FIGS. 1-5.
  • the invention in a first aspect is a rail-mounted car 115 for mixing and pumping binder or adhesive materials generally comprising: a hopper 135 to receive a cement mixture 106 including aggregate; a screw conveyor 140 connected to the hopper 135 and adapted to mix the cement mixture 106 received from the hopper 135 with water to produce concrete; an articulated boom 150; and a pump 145 adapted to pump the concrete through the boom.
  • the articulated boom 150 is hydraulically powered, electrically powered, or pneumatically powered.
  • the cement mixture is dehydrated prior to mixing with water or remains hydrated. In this context, hydrated simply means that the powdered cement or cement mixture has not been dried to remove moisture accumulating therein through routine environmental exposure.
  • the rail-mounted car 115 may also be employed in various alternative embodiments as part of a rail-mounted binder or adhesive material mixing and pumping system such as the system 100 shown in FIG. 1.
  • the system 100 in the particular embodiment of FIG. 1 , comprises a hopper car 105; a material transfer car 120 adapted to transfer a cement mixture 106 from the hopper car 105 to a mixer car 115.
  • the mixer car 115 as discussed above, includes a hopper 135; a screw conveyor 140 connected to the hopper 135 and adapted to mix the cement mixture 106 with water to produce concrete; an articulated boom 150; and a pump 145 adapted to pump the concrete through a pipe supported by the boom.
  • a method for transporting binder or adhesive materials, and, more particularly, cement mixtures by a rail-mounted train comprises: mixing sand and gravel as shown in box 505, drying the mixture as shown in box 510, weighing the mixture as shown in box 515; adding cement to the mixture as shown in box 520; and restricting moisture from contaminating the mixture as shown in box 525.
  • the method 500 may include any one or more of loading the mixture into the hopper car, sealing the hopper to restrict moisture contamination, and transporting the mixture in the hopper car.
  • the hopper car may be coupled to a material transfer car which is further coupled to a mixer car.
  • the system 100 is part of a rail-mounted train powered by a conventional locomotive engine (not shown), and includes a plurality of hopper cars 105 for transporting bulk materials.
  • the number of hopper cars 105 coupled to the train could vary depending on the amount of material that is to be transported by the train 100, as well as the capability of the engine to haul the particular number of hopper cars 105 at full payload.
  • the hopper cars 105 each include a coupler 205 on their front and back end to couple the hopper cars 105 to adjacent cars.
  • the coupler 205 on the front end of the first hopper car 105 serves to couple the hopper cars 105 of the train 100 to the engine.
  • each hopper car 105 includes two hoppers 210 for carrying the material that is transported by the train 100.
  • each hopper car 105 may be configured to have any desired number of hoppers 210, and need not be limited to two hoppers 210.
  • the bulk materials carried by the hoppers 210 is a mixture of cement with sand and gravel in one embodiment.
  • binder or adhesive materials e.g., masonry cement, oil well cement, gypsum plasters, lime mortars, calcium aluminate cement, trief cement, supersulfated cement
  • the cement mixture 106 is processed at a hot mix plant (not shown) prior to loading in the hoppers 210. It will be appreciated that in other embodiments of the present invention, the cement mixture 106 can be processed on the train 100 or at a remote site prior to mixing with water. The process by which the cement mixture 106 is prepared at the hot mix plant is explained below.
  • the hoppers 210 When viewed from the top, the hoppers 210 are rectangular in shape, and include planar end walls 215 and planar side walls 220.
  • the walls 215, 220 of the hopper 210 are inclined at shallow angles to the vertical (i.e., sloped) to effect a complete discharge of the bulk material contained therein by gravity action.
  • the hoppers 210 are supported by a pair of side sills 225 that extend the length of the hopper car 105, and by vertical posts 230, which bear on longitudinal stringers 235 that are secured to the side walls 220.
  • the hopper cars 105 include covers 110 (as shown in
  • the covers 110 are attached to the hoppers 210 via hinges (not shown), and are hinged along one of the top edges of the side walls 220. In this particular embodiment, the covers 110 will open and close the top portion of the hoppers 210 in a "clamshell" fashion. That is, when loading the hoppers 210 with the cement mixture 106, the cover 110 is raised to provide access to the hopper 210 on one end, and subsequently lowered to completely seal the hopper 210 and protect its contents from the environment.
  • the covers 110 could be configured so as to be completely removable from the top portion of the hoppers 210 for loading the cement mixture 106 into the hopper 210, and then placed atop the hopper 210 and affixed thereto via any one of several types of commercially available fasteners.
  • FIG. 3 a cross-sectional view of the hopper car 105 is shown.
  • the bottom portion of the hopper 210 includes a "clamshell" gate 305, which consists of a pair of coacting gate members 310 pivotally mounted for movement between a closed position (as illustrated in FIG. 3) and an open position.
  • the gate members 310 pivot between the open and closed positions via a pair of pivot points 315.
  • a pair of hydraulic cylinders 320 power the gate members 310 into the open and closed positions.
  • Each hydraulic cylinder 320 is coupled between the outer edge of the gate members 310 and the side walls 220 of the hopper 210.
  • the hydraulic cylinders 320 are double-acting cylinders controlled by suitable four-way control valves.
  • the control valves may be manual valves mounted on the car structure, to enable an operator to move along side the train 100 and open the gates 305 for the several hoppers 210 in a sequential manner.
  • the conveyor 325 is an endless belt conveyor consisting of an upper supply run 330 and a lower return run 340.
  • the return run 340 of the conveyor 325 in accordance with one embodiment, is supported in a plane disposed as close as possible to the upper surface of a wheel axle 345, which couples two rail wheels 350 to the hopper car 105.
  • the return run 340 of the conveyor 325 could be supported by a set of return idlers (not shown).
  • the upper supply run 330 of the conveyor 325 is supported by troughing idlers 355.
  • the troughing idlers 355 are supported in a catenary fashion by chains 360.
  • the chains 360 are supported by a set of brackets 365 secured to the side sills 225 of the hopper car 105.
  • the train conveyor 325 traverses the entire length of the hopper car portion of the train 100.
  • the hopper cars 105 are suitably provided with support structures (not shown) for supporting the conveyor 325 between the hopper cars 105.
  • the clamshell gates 305 of each of the hoppers 210 are opened, and the cement mixture 106 pours out of the bottom of the hoppers 210 onto the conveyor 325.
  • the conveyor 325 then facilitates moving the cement mixture 106 to one end of the train 100.
  • the train 100 includes a mixer car 115 coupled to one end thereof.
  • the cement mixture 106 from the hopper cars 105 is transferred to the mixer car 115 via the train conveyor 325.
  • the hoppers 210 may be emptied in sequence beginning with the hopper 210 of the hopper car 105 nearest (or adjacent to) the mixer car 115.
  • the material transfer car 120 includes an elevated conveyor track 405, which elevates the conveyed material from the conveyor 325 from the hopper cars 105 for discharge onto a transfer conveyor 410.
  • the elevated conveyor track 405 is supported by a support frame structure 415 for maintaining the elevated conveyor track 405 at a predetermined angle relative to the surface of the material transfer car 120.
  • the transfer conveyor 410 is an endless belt conveyor, which is mounted on the backend portion of the material transfer car 120.
  • the forward end of the transfer conveyor 410 is supported by a post 420, which lies under the rearward portion of the elevated conveyor track 405.
  • the middle portion of the transfer conveyor 410 is supported by a hydraulic lift cylinder 425, which raises and lowers the transfer conveyor 410 to a suitable height for transferring the bulk material (i.e., the cement mixture) to the mixer car 115.
  • the transfer conveyor 410 is provided with a hydraulically powered device (not shown) for rotating the transfer conveyor 410 relative to the axis of the post 420.
  • the discharge end of the transfer conveyor 410 can be positioned where desired (e.g., off to the side of the material transfer car 120) in order to discharge material from the transfer conveyor 410 onto another transport vehicle (not shown), for example. In the illustrated embodiment, however, the cement mixture 106 is transferred from the transfer conveyor 410 directly to the mixer car 115.
  • the material transfer car 120 may be provided with a power generating apparatus for operating the belt conveyor system (i.e., the train conveyor 325, elevated conveyor track 405, and transfer conveyor 410).
  • the belt conveyor system which consists of the aforementioned conveyors, is driven by electric motors (not shown), and the power for the electric motors may be generated by an electric generator 430, driven by an internal combustion engine 435, such as a diesel engine, for example.
  • the electric generator 430 may also provide power for auxiliary apparatus, such as the mixer car 115, which may be used in conjunction with the material transfer car 120.
  • high pressure hydraulic fluid for the operation of the hydraulic cylinders 320 on the hopper car 105, to operate the "clamshell" gate 305 of the hopper 210 may be supplied from the material transfer car 120, which would include a suitable electric motor driven hydraulic pump (not shown).
  • the mixer car 115 includes a hopper 135, which receives the cement mixture 106 from the transfer conveyor 410 of the material transfer car 120.
  • the water supplied to the hopper 135 and screw conveyor 140 could come from a "water car” (not shown) that is coupled to the other end of the train 100. That is, the end of the train 100 proximate to the locomotive engine. Alternatively, the water may be supplied locally from the point where the concrete is laid.
  • the mixer car 115 is further provided with a concrete pump 145, which receives the concrete via the concrete mixing screw conveyor 140, and forces the concrete through a powered articulated boom 150.
  • the boom 150 is extendible and retractable, and rotates about its base, permitting a greater range of mobility and distance for laying the concrete proximate to the train 100.
  • the boom 150 is powered by hydraulics. In other embodiments, the boom 150 can be electrically or pneumatically powered.
  • Cement processing typically consists of quarrying and crushing the rock, grinding the proportioned materials to high fineness, subjecting the raw mix to pyroprocessing in a kiln, and grinding the resulting clinker to a fine powder.
  • a fuller discussion of cement processing such as generally comprises the state of the art can be found in KIRK-OT ⁇ MER, ENCYCLOPEDIA OF CHEMICAL TECHNOLOGY (3d ed. 1979). However, aggregates combined with the cement to form concrete, such as sand and gravel, are not included in cement processing.
  • a process 500 is shown for preparing the cement to be carried on the train 100.
  • the process 500 commences at step 505 where sand and gravel are mixed.
  • the mixture is then run through a drier at step 510.
  • the drier raises the temperature of the sand and gravel to approximately 250 degrees Fahrenheit in one embodiment. By heating the sand and gravel to approximately 250 degrees Fahrenheit, the resulting moisture content of the sand and gravel is approximately less than one percent.
  • the sand and gravel mixture is weighed.
  • the mixture is combined with dry cement in the proper proportions for an eight cubic yard batch in accordance with one embodiment.
  • moisture is restricted from contacting the 8-yard batches of the cement mixture.
  • the train 100 could carry the cement and the sand and gravel mixture separately. That is, the cement could be carried by its own designated hopper cars 105 and the sand and gravel mixture could be carried in their own separate hopper cars 105.
  • the hoppers 210 of the train 100 are loaded with the cement mixture 106 after the mixture is processed by the hot mix plant.
  • covers 110 are placed atop the hoppers 210 to restrict moisture from contacting the cement mixture 106 during transport to a desired location.
  • the train 100 transports the cement mixture 106 to a location where it is desired to lay concrete.
  • the hoppers 210 of the hopper cars 105 are sequentially emptied.
  • the car closest to and/or adjacent to the mixer car 115 is emptied first.
  • the hoppers 210 could be emptied either manually or automatically. That is, in one embodiment, a control panel (not shown) could be used such that a crew member could manually discharge the contents of each hopper 210. Alternatively, such discharge could be performed automatically by causing the "clamshell" gates 305 of each hopper 210 to open sequentially for a predetermined time period to allow the contents of the hopper 210 to fully discharge.
  • the train conveyor 325 transports the cement mixture 106 to the material transfer car 120.
  • the material transfer car 120 receives the cement mixture 106 from the train conveyor 325 on the elevated conveyor track 405, which transfers the cement mixture 106 to the transfer conveyor 410.
  • the transfer conveyor then elevates the cement mixture 106 for transfer to the mixer car 115.
  • the mixer car 115 receives the cement mixture 106 in the hopper 135, which transfers the cement mixture 106 to the concrete mixing screw conveyor 140.
  • the concrete mixing screw conveyor mixes the cement mixture 106 with water and transfers the mixed concrete to the concrete pump 145.
  • the water could be supplied to the concrete mixing screw 140 from a "water car" (not shown) on the other end of the train 100.
  • the concrete pump 145 then forces the concrete through an articulated boom for laying the concrete at the desired location.
  • the system 100 of FIGS. 1-5 may be employed to perform one variant embodiment of the method 500 in FIG. 6 as set forth in FIG. 7.
  • FIG. 7 a method 600 for transporting binder or adhesive materials, and, more particularly, cement mixtures by a rail- mounted train is shown.
  • the method 600 begins with mixing sand and gravel as shown in box 605; continues with drying the mixture as shown in box 610; weighing the mixture as shown in box 615; adding cement to the mixture as shown in box 620; loading the mixture into a hopper car as shown in box 625; and transporting the loaded cars as shown in box 630.
  • the hopper may be sealed to restrict moisture contamination or may be coupled to a material transfer car which may be coupled to a mixer car.
  • the system 100 of FIGS. 1-5 may also be employed to perform a second variant embodiment of the method 500 in FIG. 6 as set forth in FIG. 8.
  • the method 700 begins by mixing sand and gravel as shown in box 705; and then continues by drying the mixture as shown in box 710; weighing the mixture as shown in box 715; adding cement to the mixture as shown in box 720; loading the mixture into a hopper car as shown in box 725; transferring the mixture from the hopper car to a mixer car as shown in box 730; mixing the mixture with water to produce concrete as shown in box 735; and pumping the concrete through an articulated boom as shown in box 740.
  • the method 700 may also be performed with the articulated boom affixed to the mixer car and may include sealing the hopper car to restrict moisture contamination.
  • a method and apparatus for a rail-mounted binder or adhesive material mixer and pump system provides, in its various embodiments, a method and apparatus for a rail-mounted binder or adhesive material mixer and pump system.
  • a method is provided for transporting and mixing binder or adhesive materials by a rail-mounted train.
  • a cement and aggregate mixture is processed prior to mixing with water to reduce its moisture content.
  • the mixture is transported in a rain-proof hopper car to the desired site.
  • a rail-mounted mixer car for mixing and pumping binder or adhesive materials includes a powered articulated boom. The boom permits a greater range of mobility and distance for pumping the binder or adhesive material proximate to the mixer car.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

L'invention concerne un procédé et un appareil permettant de transporter, de mélanger et de pomper un matériau liant ou adhésif au moyen d'un train ferroviaire. Un véhicule ferroviaire (100) comprend une trémie (135) destinée à recevoir un mélange cémenteux comprenant du granulat. Une vis hélicoïdale, reliée à la trémie, est conçue pour mélanger, avec de l'eau, le mélange cémenteux provenant de la trémie pour produire le béton. L'invention concerne également une flèche articulée (150) et une pompe (145), cette dernière étant conçue pour pomper le béton à travers ladite flèche. Le matériau liant ou adhésif comprenant le mélange de sable et de gravier est transporté par un train ferroviaire. Le mélange est chauffé à l'intérieur d'un séchoir (510) et pesé. On ajoute du ciment au mélange (520). On traite le mélange ciment gravier avant de le mélanger avec de l'eau afin d'en réduire la teneur en humidité. Le mélange peut être transporté dans un wagon-conteneur imperméable à la pluie jusqu'au site désiré via un wagon-trémie (105) muni d'un mécanisme de décharge par le bas afin de limiter la contamination du mélange par l'humidité.
PCT/US1999/028291 1998-11-30 1999-11-30 Procede et appareil d'un systeme de pompe et de melange de beton sur rail WO2000032372A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU21602/00A AU2160200A (en) 1998-11-30 1999-11-30 Method and apparatus for a rail-mounted concrete mixer and pump system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11029398P 1998-11-30 1998-11-30
US60/110,293 1998-11-30

Publications (2)

Publication Number Publication Date
WO2000032372A1 true WO2000032372A1 (fr) 2000-06-08
WO2000032372A8 WO2000032372A8 (fr) 2001-02-22

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WO (1) WO2000032372A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005092584A1 (fr) * 2004-03-26 2005-10-06 Putzmeister Aktiengesellschaft Installation et procede pour produire des elements prefabriques en beton
GB2503005A (en) * 2012-06-13 2013-12-18 Nurock Mixers Ltd Mobile mixing apparatus
WO2014040833A3 (fr) * 2012-09-14 2014-06-26 Lintec Gmbh & Co. Kg Dispositif modulaire de refoulement de béton
US8979578B2 (en) 2007-03-14 2015-03-17 Adc Gmbh Electrical connector with relative movement of mid sections of contacts inhibited by frictional engagement with a recess
CN106994743A (zh) * 2017-05-04 2017-08-01 中铁五局集团有限公司 一种高铁无砟道床混凝土施工面线间有轨运输装置和方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111702953B (zh) * 2020-05-22 2022-02-11 桐乡市振大水泥股份有限公司 一种抗裂改性水泥生产设备

Citations (5)

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Publication number Priority date Publication date Assignee Title
US3122890A (en) * 1959-10-27 1964-03-03 Maxwell F Kemper Apparatus for lining tunnels with concrete
US4795264A (en) * 1986-11-29 1989-01-03 Messrs. Stetter GmbH Arrangement for concrete production in tunnels
US4872760A (en) * 1987-02-25 1989-10-10 Vladimirsky Politekhnichesky Institut Glavnoe Territorialone Upravlenie Po Stroitelstvu Vo Method and apparatus for processing a mix, preferably concrete mix
US5044819A (en) * 1990-02-12 1991-09-03 Scanroad, Inc. Monitored paving system
US5624183A (en) * 1993-03-29 1997-04-29 Schuff; David A. Apparatus for metering and mixing aggregate and cement

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122890A (en) * 1959-10-27 1964-03-03 Maxwell F Kemper Apparatus for lining tunnels with concrete
US4795264A (en) * 1986-11-29 1989-01-03 Messrs. Stetter GmbH Arrangement for concrete production in tunnels
US4872760A (en) * 1987-02-25 1989-10-10 Vladimirsky Politekhnichesky Institut Glavnoe Territorialone Upravlenie Po Stroitelstvu Vo Method and apparatus for processing a mix, preferably concrete mix
US5044819A (en) * 1990-02-12 1991-09-03 Scanroad, Inc. Monitored paving system
US5624183A (en) * 1993-03-29 1997-04-29 Schuff; David A. Apparatus for metering and mixing aggregate and cement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005092584A1 (fr) * 2004-03-26 2005-10-06 Putzmeister Aktiengesellschaft Installation et procede pour produire des elements prefabriques en beton
US8979578B2 (en) 2007-03-14 2015-03-17 Adc Gmbh Electrical connector with relative movement of mid sections of contacts inhibited by frictional engagement with a recess
GB2503005A (en) * 2012-06-13 2013-12-18 Nurock Mixers Ltd Mobile mixing apparatus
WO2014040833A3 (fr) * 2012-09-14 2014-06-26 Lintec Gmbh & Co. Kg Dispositif modulaire de refoulement de béton
CN106994743A (zh) * 2017-05-04 2017-08-01 中铁五局集团有限公司 一种高铁无砟道床混凝土施工面线间有轨运输装置和方法

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WO2000032372A8 (fr) 2001-02-22

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