US3781154A - Device for forming shear keyways on sides of extruded slabs and the like - Google Patents

Device for forming shear keyways on sides of extruded slabs and the like Download PDF

Info

Publication number
US3781154A
US3781154A US00265150A US3781154DA US3781154A US 3781154 A US3781154 A US 3781154A US 00265150 A US00265150 A US 00265150A US 3781154D A US3781154D A US 3781154DA US 3781154 A US3781154 A US 3781154A
Authority
US
United States
Prior art keywords
belt
slab
projections
frame
pulleys
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US00265150A
Other languages
English (en)
Inventor
D Herbert
E Martens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DIONIAN INDUSTRIES Ltd
Original Assignee
Spiroll Corp Ltd
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 Spiroll Corp Ltd filed Critical Spiroll Corp Ltd
Application granted granted Critical
Publication of US3781154A publication Critical patent/US3781154A/en
Assigned to DIONIAN INDUSTRIES LTD reassignment DIONIAN INDUSTRIES LTD CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE OCT. 24, 1978. Assignors: SPIROLL CORPORATION LTD.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/22—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded by screw or worm
    • B28B3/228—Slipform casting extruder, e.g. self-propelled extruder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
    • B28B1/084—Producing shaped prefabricated articles from the material by vibrating or jolting the vibrating moulds or cores being moved horizontally for making strands of moulded articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/08—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads
    • B28B11/0863—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads for profiling, e.g. making grooves

Definitions

  • ABSTRACT An endless belt with projections on the outer surface is mounted on the side plates of a concrete slab making machine so that as the slab is formed, horizontal shear keyways are formed in the sides of the slab. When adjacent slabs are grouted, the keyways and the grout form horizontal shear key assemblies which prevent horizontal and vertical movement from occurring from between slabs.
  • Such slabs can be manufactured by a variety of machines but preferably they are extruded behind a machine which moves along a pair of rails, the slab being formed upon a bed with the machine being moved along the rails by the extruding process.
  • Such slabs are normally formed with a plurality of longitudinally extending apertures therethrough and, when manufactured, longitudinally extending grooves are formed in the sides of the slab which act as vertical shear keyways.
  • the space between adjacent slabs and the longitudinal keyways are filled with a grout which prevents vertical movement occurring between adjacent slabs.
  • the present invention overcomes these disadvantages by providing shear keyways in the sides of the slabs as they are being formed by the machine which, when grouted, prevent horizontal movement from oc curring between adjacent slabs.
  • Another object of the invention is to provide a device of the character herewithin described which is driven by the relative movement between the machine and the slab being formed.
  • the device can be power driven.
  • a yet further object of the invention is to provide a device of the character herewithin described which includes means to adjust the angle of inclination to the vertical of the keyway forming projections.
  • a further object of the invention in conjunction with the last mentioned object is to provide a device of the character herewithin described in which the angle of inclination of the inner run of the belt can be adjusted relative to the longitudinal axis of the machine so that the best angle of entry of the projections can be set.
  • Still another object of the invention is to provide a device of the character herewithin described which is easily fitted to existing slabmaking machines.
  • Another object of the invention is to provide a device of the character herewithin described which is simple in construction, economical in manufacture and otherwise well suited to the purpose for which it is designed.
  • the present invention consists of the inventive concept which is comprised, embodied, embraced, or included in the means, method, process, product, construction, composition, arrangement of parts, or new use of any of the foregoing, herein exemplified in one or more specific embodiments of such concept, reference being had to the accompanying drawings in which:
  • FIG. 1 is an isometric, partially schematic view of the device attached to a concrete slab forming machine.
  • FIG. 2 is an enlarged isometric view of the device attached to the side plate of the machine with the machine removed for clarity and showing a portion of the slab formed with the shear keyways formed thereon.
  • FIG. 3 is a sectional view of two adjacent slabs showing the relationship of the shear keyways.
  • FIG. 4 is a top plan view of the device shown in relation to one of the forming augers of the machine and showing an alternative shape of the belt used in forming the shear keyways.
  • FIG. 5 is an isometric view of the preferred embodiment of the belt.
  • FIG. 6 is a cross sectional view along the line 6-6 of FIG. 4.
  • FIG. 7 is a side elevation of one of the belt pulleys showing means to drive the belt.
  • FIG. 8 is a cross sectional view of one embodiment of the belt.
  • FIG. 9 is a cross sectional view of a second embodiment of the belt.
  • FIG. 10 is a cross sectional view of a third embodiment of the belt.
  • FIG. 111 is a schematic front elevation of a portion of the belt showing various shapes of shear keyway forming projections.
  • FIG. 1 will show a concrete slab forming machine collectively designated 10 and including a pair of spaced and parallel rails I 1 upon which the machine is mounted by means of wheels 12.
  • a hopper I3 is provided within which concrete is placed and it is compacted within a packing chamber generally in the area indicated by reference character 14. It is extruded rearwardly upon a pallet (not illustrated) and the machine moves in the direction of arrow 15 being pushed along by the concrete slabs to being formed by the machine.
  • a machine is exemplified in U. S. Pat. No. 3,284,867.
  • the device collectively designated 17 is situated upon each side of the machine (only one being shown in the drawings) upon side plates 11% of the packing or compaction chamber situated in the area 14.
  • the side plate 18 is provided with a longitudinally extending aperture 19 and an angulated bracket 20 is secured to one end of the side plate and to the frame of the machine (not illustrated).
  • the device 17 includes a frame generally indicated by 21 which includes a pair of spaced and parallel horizontally disposed plates 22 (see FIG. 6), an outer longitudinally extending belt guide 23 and an inner combination attaching plate and belt guide 24 all of which may be welded together or otherwise secured.
  • Trailing and leading belt guide means 25 are provided and take the form of forks 26 having a central tongue 27 extending therefrom.
  • the forks 26 are provided with pulleys 27 journalled upon spindles 2%, ball races 29 mounting the pulleys for rotation in a horizontal plane.
  • the tongue 27 slides between the aforementioned upper and lower plates 22 and bolts 30 normally clamp the tongues between the plates 22 as clearly shown in FIG. 2.
  • an adjusting bolt 31 screw threadably engages the rear end of the tongue and reacts between a cross bar 32 spanning the inner and outer guides 23 and 24, so that rotation of this adjusting bolt, once the clamp bolts 30 have been slackened, moves the forks inwardly or outwardly relative to one another.
  • These bolts act as belt adjustors to adjust the tension in the belt collectively designated 33 and which engages around the pulleys 27.
  • the device is attached to the side plates 18 over the longitudinal apertures 19, by means of a plurality of screw threaded bolts 34 screw threadably engaging the side plates.
  • FIG. 2 shows the uppermost of these bolts whereas FIG. 6 shows the upper and lower bolts.
  • FIG. 6 shows the bolts adjusted to adjust the angle of the device vertically with the underside being closer to the side plate than the upper side thereof.
  • FIG. 4 shows the bolts and studs have been used to adjust the longitudinal axis 36 of the devicerelative to the longitudinal axis 37 of the machine, it being understood that the auger 38 lies parallel to the longitudinal axis of the machine.
  • the belt 33 has been adjusted so that the leading end 39 of the inner run 33A is substantially flush with the inner surface 40 of the side plate and the trailing end 41 of the inner run 33A projects inwardly of the inner surface of the side plate, the reasons for which will hereinafter become apparent.
  • the outer surface of the belt is provided with a plurality of shear keyway forming projections 41 which may take various shapes and configurations as shown in the drawings.
  • the upper sides 42 slope downwardly and outwardly from the main web 43 of the belt and the lower sides 44 slope upwardly and outwardly relative thereto but not to the same degree.
  • the leading side surface 45 may be substantially at right angles to the web 43 but the trailing side surface 46 slopes slightly inwardly from the web towards the outer vertical face 47 of the projections.
  • the angle of inclination is set by the set screws 35 and the attaching bolts 34 so that the device is situated, for example, as shown in FIGS. 4 and 6.
  • the machine moves in the direction of arrow and the projections on the inner run 33A of the belt form the shear keys 48 in the sides 49 of the slab as clearly shown in FIGS. 2 and 3.
  • the tapered auger 38 compresses the concrete in the area 50 between the auger and the side plate 40 and the engagement of the projections with this concrete as it is being formed, rotates the belt around the pulleys in the direction of arrow 51 thus gradually forming the shear keyways to the maximum depth at the trailing end 40 of the belt.
  • the configuration described relative to the belt shown in FIG. 5 facilitates the clean withdrawal of the projections from the finished keyways 48 as the belt moves around the trailing pulley specifically designated 27A.
  • the angle of inclination of the device when viewed in plan as in FIG. 4 gradually forms the keyways and in conjunction with the concrete being compressed, also assists in compressing the areas surrounding the shear keyways 48.
  • the angle of inclination illustrated in FIG. 6 enables the device to form keyways 48 having a base deeper than the upper side as shown in FIG. 3.
  • keyways 48 Formed conventionally by the concrete slab forming machine, is the longitudinally extending shear keyway 52 and this is situated above the keyways 48. These keyways 48 extend from the adjacent the lower boundary of the keyway 52 to the underside of the slab or may terminate spaced from the underside as illustrated in FIG. 2.
  • FIG. 4 shows a belt having the projections 41A in the form of counter curves with the side profile being similar to that illustrated in FIG. 8.
  • the profile can be as illustrated in FIGS. 9 or 10.
  • FIG. 11 shows a variety of different shape projections it being understood, of course, that the preferred shape only would be used on a belt.
  • Reference character 418 shows a foursided triangular projection.
  • 41C illustrates a square projection.
  • 41D illustrates a truncated foursided cone shaped projection.
  • 41E illustrates a semispherical projection.
  • 41F illustrates a truncated conical projection and
  • 41 G illustrates a rectangular shaped projection.
  • other shapes may be used as desired.
  • FIG. 7 shows one method of providing this power.
  • An hydraulic motor 55 is connected to a source of hydraulic pressure (not illustrated) and is connected to the spindle 28 of one of the pulleys 27. This rotates the pulley at the same time rotating the belt but, of course it will be appreciated that it is absolutely essential that the linear speed of the inner run of the belt be exactly the same as the linear speed of the relative movement between the machine and the slab and in this connection a conventional slip clutch assembly shown schematically in FIG. 7 by reference character 56, may be provided.
  • the angle of inclination both vertically and horizontally of the device relative to the machine may be adjusted to give the best formation of the shear keys 48 and the clean withdrawal of the projections therefrom at the trailing end of the device.
  • the auger assembly includes a tapered auger shaft 38A increasing in diameter from the leading end 388 towards the trailing end 38C.
  • the auger flight 38D has a constant diameter so that the depth of the auger flight relative to the tapered shaft 38A gradually decreases from a maximum at the leading end 3813 to zero at the trailing end 38C.
  • a trowelling mandrel 38E is formed beyond the termination of the auger flight 38D by an extension of the full diameter portion of the shaft 38A.
  • leading end 39B of the belt preferably should be located adjacent to the second spiral 38F of the tapered auger flight 38D so that the shear keyways 48 commence to be formed as the con crete reaches the critical stage of compaction.
  • the concrete starts to compact at the end 38B of the auger flight and reaches full compaction at the opposite end 38C.
  • the shear keyways are gradually formed as the concrete reaches its maximum compaction due to the funnelling or throating relationship between the tapered auger and the inner run of the belt. This means that as the projections on the inner run reach the trailing end of the inner run, the shear keyways 48 are fully formed in fully compressed or compacted concrete and they then withdraw cleanly from the keyways as this portion of the belt moves around the trailing pulley 27.
  • FIG. 6 will show that longitudinally extending recesses 23' and 24 are formed on the outer surfaces of the outer and inner side plates 23 and 24 respectively, to receive and guide the web 43 of the belt 33 and to support same vertically.
  • a concrete slab forming machine which includes a packing chamber having a pair of opposed longitudinally apertured side plates; a horizontal shear keyway forming device, means for mounting said device one upon each side plate at said longitudinal apertures, said device including a frame, belt guide means at each end of said frame and an endless belt extending around said belt guide means whereby the inner run of the belt engages through said aperture in the side plate and engages the side of the concrete slab being formed by the machine, and a plurality of outwardly extending shear keyway forming projections on the outer surface of said belt.
  • said belt guide means takes the form of a pair of pulleys journalled for rotation one at each end of said frame and in a horizontal plane.
  • the device according to claim l which includes front and rear side guide means for said belt on said frame and being situated longitudinally between said belt guide means.
  • said means mounting said device upon said side plate includes further means to adjust the angle of inclination of the inner run of said belt from the vertical and said further means also adjusting the angle of inclination of the inner run of said belt relative to the longitudinal axis of the machine thereby controlling the degree of penetration of the projections into the side of the concrete slab.
  • said means mounting said device upon said side plate includes further means to adjust the angle of inclination of the inner run of said belt from the vertical and said further means also adjusting the angle of inclination of the inner run of said belt relative to the longitudinal axis of the machine thereby controlling the degree of penetration of the projections into the side of the concrete slab.
  • said means mounting said device upon said side plate includes further means to adjust the angle of inclination of the inner run of said belt from the vertical and said further means also adjusting the angle of inclination of the inner run of said belt relative to the longitudinal axis of the machine thereby controlling the degree of penetration of the projections into the side of the concrete slab.
  • the device according to claim 2 which includes means to adjust the tension in said belt, said means including a slide plate for mounting each of said pulleys in said frame, and a screw threaded adjusting bolt reacting between said frame and said slide plates for moving same endwise relative to said frame and clamp bolt means for clamping said slide plates onto said frame when adjusted.
  • the device according to claim 4 which includes means to adjust the tension in said belt, said means including a slide plate for mounting each of said pulleys in said frame, and a screw threaded adjusting bolt reacting between said frame and said slide plates for moving same enwise relative to said frame and clamp bolt means for clamping said slide plates onto said frame when adjusted.
  • the device according to claim 6 which includes means to adjust the tension in said belt, said means including a slide plate for mounting each of said pulleys in said frame, and a screw threaded adjusting bolt reacting between said frame and said slide plates for moving same endwise relative to said frame and clamp bolt means for clamping said slide plates onto said frame when adjusted.
  • the device according to claim 10 which includes means to adjust the tension in said belt, said means including a slide plate for mounting each of said pulleys in said frame, and a screw threaded adjusting bolt reacting between said frame and said slide plates for moving same endwise relative to said frame and clamp bolt means for clamping said slide plates onto said frame when adjusted.
  • the device according to claim 2 which includes means to drive said belt, said last means including a source of power operatively connected to one of said pulleys and slip clutch means between said source of power and said pulley whereby the linear speeds of said slab being formed and said belt are the same.
  • the device according to claim 4 which includes means to drive said belt, said last means including a source of power operatively connected to one of said pulleys and slip clutch means between said source of power and said pulley whereby the linear speeds of said slab being formed and said belt are the same.
  • the device according to claim 6 which includes means to drive said belt, said last means including a source of power operatively connected to one of said pulleys and slip clutch means between said source of power and said pulley whereby the linear speeds of said slab being formed and said belt are the same.
  • the device according to claim 10 which includes means to drive said belt, said last means including a source of power operatively connected to one of said pulleys and slip clutch means between said source of power and said pulley whereby the linear speeds of said slab being formed and said belt are the same.
  • the device according to claim 17 which includes means to drive said belt, said last means including a source of power operatively connected to one of said pulleys and slip clutch means between said source of power and said pulley whereby the linear speeds of said slab being formed and said belt are the same.
  • the device according to claim 18 which includes means to drive said belt, said last means including a source of power operatively connected to one of said pulleys and slip clutch means between said source of power and said pulley whereby the linear speeds of said slab being formed and said belt are the same.
  • a concrete slab forming machine comprising in combination with a source of power, a hopper, a packing chamber having a pair of opposed longitudinally apertured side plates, and at least one auger assembly extending therein, said auger assembly including a shaft portion and an auger flight extending therearound, said shaft portion increasing in diameter from the leading end to the trailing end, the outer diameter of said auger flight remaining constant whereby the depth of said auger flight gradually diminishes from a maximum at said leading end to zero at the trailing end, a horizontal shear keyway forming device, means for mounting said device one upon each side plate at said longitudinal apertures, said device including a frame, belt guide means at each end of said frame and an endless belt extending around said belt guide means whereby the inner run of the belt engages through said aperture in the side plate and engages the side of the concrete slab being formed by the machine, and a plurality of outwardly extending shear keyway forming projections on the outer surface of said belt.
  • said means mounting said device upon said side plate includes further means to adjust the angle of inclination of the inner run of said belt from the vertical and said further means also adjusting the angle of inclination of the inner run of said belt relative to the longitudinal axis of the machine thereby controlling the degree of penetration of the projections into the side of the concrete slab.
  • the device according to claim 29 which includes means to adjust the tension in said belt, said means including a slide plate for mounting each of said pulleys in said frame, and a screw threaded adjusting bolt reacting between said frame and said slide plates for moving same endwise relative to said frame and clamp bolt means for clamping said slide plates onto said frame when adjusted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
US00265150A 1971-07-02 1972-06-22 Device for forming shear keyways on sides of extruded slabs and the like Expired - Lifetime US3781154A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3122171A GB1387826A (en) 1971-07-02 1971-07-02 Device for forming shear keyways on sides of extruded slabs and the like

Publications (1)

Publication Number Publication Date
US3781154A true US3781154A (en) 1973-12-25

Family

ID=10319847

Family Applications (1)

Application Number Title Priority Date Filing Date
US00265150A Expired - Lifetime US3781154A (en) 1971-07-02 1972-06-22 Device for forming shear keyways on sides of extruded slabs and the like

Country Status (21)

Country Link
US (1) US3781154A (de)
AT (1) AT318459B (de)
AU (1) AU473875B2 (de)
BE (1) BE785651A (de)
BR (1) BR7204315D0 (de)
CA (1) CA958193A (de)
CH (1) CH557225A (de)
CS (1) CS164780B2 (de)
DD (1) DD97379A5 (de)
DE (1) DE2232305C3 (de)
DK (1) DK133087C (de)
ES (1) ES407033A1 (de)
FR (1) FR2145206A5 (de)
GB (1) GB1387826A (de)
IE (1) IE36648B1 (de)
IT (1) IT962375B (de)
NL (1) NL7209071A (de)
NO (1) NO134688C (de)
PL (1) PL84827B1 (de)
SE (1) SE378375B (de)
ZA (1) ZA724367B (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022556A (en) * 1975-04-30 1977-05-10 The George Hyman Construction Company Concrete slab extruder having a free flight auger
US4125348A (en) * 1976-07-09 1978-11-14 Spiroll Corporation Ltd. Slip former with keyway forming assemblies
US4133619A (en) * 1976-09-10 1979-01-09 The Flexicore Co., Inc. Extrusion casting apparatus
US4419066A (en) * 1980-10-28 1983-12-06 Biomass Development S.A. Machine for continuously densifying ligno-cellulosic or like materials
US4600549A (en) * 1984-04-23 1986-07-15 Kimberly-Clark Corporation Method and device for producing endless synchronous belt with modifed teeth
US4773838A (en) * 1986-04-07 1988-09-27 Kt-Suunnittelu Oy Slipforming extruder for casting concrete slabs
US4778371A (en) * 1986-01-17 1988-10-18 Kt-Suunnittelu Oy Apparatus for forming frogs in the sides of a concrete element
US4968236A (en) * 1989-07-06 1990-11-06 Ultra Span - A Division Of Alphair Ventilating Systems Inc. Auxiliary auger assembly for hollow core slab production
US5173309A (en) * 1990-08-21 1992-12-22 Belarde John F Apparatus for forming concrete barriers
US5533888A (en) * 1990-08-21 1996-07-09 Belarde; John F. Apparatus for forming concrete barriers
GB2433912A (en) * 2005-09-28 2007-07-11 Laing O Rourke Plc A concrete keyway former
CN103909558A (zh) * 2014-04-24 2014-07-09 河南省四达仙龙实业有限公司 一种水泥楼板成型机的补水机构
CN105693162A (zh) * 2016-01-21 2016-06-22 正太集团有限公司 半干性砼及用于预制按长截取空心楼板的方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1195098B (it) * 1986-07-11 1988-10-12 Russo A & C Sas Impianto per la produzione su pista di pannelli alveolari in cemento armato precompresso o parzialmente precompresso o con armatura lenta estesa alle superfici inferiore e superiore ed alle costole e prodotto derivato
FI101208B1 (fi) * 1992-10-05 1998-05-15 Addtek Res & Dev Oy Ab Menetelmä betonituotteiden valamiseksi
FI109284B (fi) * 1996-12-04 2002-06-28 Partek Concrete Dev Oy Ab Menetelmä ja laitteisto betonituotteiden valamiseksi
US6923630B2 (en) * 2001-07-30 2005-08-02 Slipstone, Inc. Apparatus and method for impressing patterns in a slip-formed concrete wall

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022556A (en) * 1975-04-30 1977-05-10 The George Hyman Construction Company Concrete slab extruder having a free flight auger
US4125348A (en) * 1976-07-09 1978-11-14 Spiroll Corporation Ltd. Slip former with keyway forming assemblies
US4133619A (en) * 1976-09-10 1979-01-09 The Flexicore Co., Inc. Extrusion casting apparatus
US4419066A (en) * 1980-10-28 1983-12-06 Biomass Development S.A. Machine for continuously densifying ligno-cellulosic or like materials
US4600549A (en) * 1984-04-23 1986-07-15 Kimberly-Clark Corporation Method and device for producing endless synchronous belt with modifed teeth
US4778371A (en) * 1986-01-17 1988-10-18 Kt-Suunnittelu Oy Apparatus for forming frogs in the sides of a concrete element
US4773838A (en) * 1986-04-07 1988-09-27 Kt-Suunnittelu Oy Slipforming extruder for casting concrete slabs
US4968236A (en) * 1989-07-06 1990-11-06 Ultra Span - A Division Of Alphair Ventilating Systems Inc. Auxiliary auger assembly for hollow core slab production
US5173309A (en) * 1990-08-21 1992-12-22 Belarde John F Apparatus for forming concrete barriers
US5290492A (en) * 1990-08-21 1994-03-01 Belarde John F Method for forming concrete barriers
US5533888A (en) * 1990-08-21 1996-07-09 Belarde; John F. Apparatus for forming concrete barriers
US5616291A (en) * 1990-08-21 1997-04-01 John-Wayne Construction Company, Inc. Method for forming concrete barriers
GB2433912A (en) * 2005-09-28 2007-07-11 Laing O Rourke Plc A concrete keyway former
GB2433912B (en) * 2005-09-28 2010-12-22 Laing O Rourke Plc A keyway former
CN103909558A (zh) * 2014-04-24 2014-07-09 河南省四达仙龙实业有限公司 一种水泥楼板成型机的补水机构
CN105693162A (zh) * 2016-01-21 2016-06-22 正太集团有限公司 半干性砼及用于预制按长截取空心楼板的方法

Also Published As

Publication number Publication date
DE2232305B2 (de) 1974-02-14
BR7204315D0 (pt) 1973-07-03
NO134688C (de) 1976-12-01
CA958193A (en) 1974-11-26
AU4405672A (en) 1974-01-03
IE36648B1 (en) 1977-01-19
BE785651A (fr) 1972-10-16
DE2232305A1 (de) 1973-01-18
DK133087C (da) 1976-08-23
IT962375B (it) 1973-12-20
CH557225A (de) 1974-12-31
AT318459B (de) 1974-10-25
ZA724367B (en) 1973-03-28
NO134688B (de) 1976-08-23
NL7209071A (de) 1973-01-04
CS164780B2 (de) 1975-11-28
IE36648L (en) 1973-01-02
AU473875B2 (en) 1976-07-08
ES407033A1 (es) 1975-11-01
SE378375B (de) 1975-09-01
PL84827B1 (de) 1976-04-30
DE2232305C3 (de) 1974-09-12
DK133087B (da) 1976-03-22
GB1387826A (en) 1975-03-19
FR2145206A5 (de) 1973-02-16
DD97379A5 (de) 1973-05-05

Similar Documents

Publication Publication Date Title
US3781154A (en) Device for forming shear keyways on sides of extruded slabs and the like
US3775529A (en) Method of surface finishing cast concrete panels
US8268019B2 (en) Method for making capacitor element
DE69430443T2 (de) Verfahren und vorrichtung zum herstellen von betongegenständen
US3877860A (en) Extrusion machine for making articles of cement-like material
US3608012A (en) Method for the manufacture of elongated objects of concrete
CA1059735A (en) Horizontal shear keyway forming assembly for slab forming machines
DE3805720A1 (de) Verfahren zum herstellen von betonteilen und einrichtung zur durchfuehrung des verfahrens
EP1838507B1 (de) Verfahren und vorrichtung zum herstellen von hohlbausteinen
CN117802838A (zh) 一种铁路枕木铺设机
US3807184A (en) Method and means for producing pile or like structural columns in situ
DK158073B (da) Apparat til strengpresning af langstrakte betonemner
DE2054168C3 (de) Vorrichtung zur Herstellung von aus Marmorbruch und Polyesterharz bestehenden Blöcken durch Mischen und Rütteln dieser Stoffe unter Unterdruck
DE3912728C1 (de)
EP2718071B1 (de) Steinformmaschine und verfahren zur höhenverstellung einer steinformmaschine
DE2343471C2 (de) Verfahren und Einrichtung zum Herstellen von langen Spannbetonelementen
DE2059760C2 (de) Gleitfertiger zum Herstellen von Formkörpern aus Beton oder ähnlichem Material
DE3718281C2 (de)
FI93326C (fi) Laite ontelobetonilaattojen muodostamiseksi
US1616816A (en) Packer head eor pipe-molding machines
DE2349132C3 (de) Vorrichtung zum Verdichten von Frischbeton
EP1308254B1 (de) Formgebungseinrichtung zur Herstellung von Rohren aus Betongemenge
DE2201233A1 (de) Einrichtung zur herstellung grossflaechiger bauteile aus erhaertendem werkstoff
DE2455962C3 (de) Vorrichtung zum Verdichten oder Verformen von schüttbarem Material in Formkästen, insbesondere zum Verdichten von Frischbeton
DE2349132B2 (de) Vorrichtung zum verdichten von frischbeton

Legal Events

Date Code Title Description
AS Assignment

Owner name: DIONIAN INDUSTRIES LTD

Free format text: CHANGE OF NAME;ASSIGNOR:SPIROLL CORPORATION LTD.;REEL/FRAME:003984/0161

Effective date: 19781129