OA11711A - Void formers and a cover for void formers. - Google Patents

Void formers and a cover for void formers. Download PDF

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Publication number
OA11711A
OA11711A OA1200100039A OA1200100039A OA11711A OA 11711 A OA11711 A OA 11711A OA 1200100039 A OA1200100039 A OA 1200100039A OA 1200100039 A OA1200100039 A OA 1200100039A OA 11711 A OA11711 A OA 11711A
Authority
OA
OAPI
Prior art keywords
casting
void
spacer
aid
structural element
Prior art date
Application number
OA1200100039A
Inventor
Harm Benjamin Steyn
Original Assignee
Harm Benjamin Steyn
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 Harm Benjamin Steyn filed Critical Harm Benjamin Steyn
Publication of OA11711A publication Critical patent/OA11711A/en

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Classifications

    • 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
    • E04G9/00—Forming or shuttering elements for general use
    • E04G9/08—Forming boards or similar elements, which are collapsible, foldable, or able to be rolled up
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/17—Floor structures partly formed in situ
    • E04B5/18—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly cast between filling members
    • E04B5/21—Cross-ribbed floors
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/30—Columns; Pillars; Struts
    • E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
    • 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
    • E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
    • E04G15/06—Forms or shutterings for making openings, cavities, slits, or channels for cavities or channels in walls of floors, e.g. for making chimneys
    • E04G15/061—Non-reusable forms
    • 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
    • E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
    • E04G15/06—Forms or shutterings for making openings, cavities, slits, or channels for cavities or channels in walls of floors, e.g. for making chimneys
    • E04G15/063—Re-usable forms
    • 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
    • E04G9/00—Forming or shuttering elements for general use
    • E04G9/02—Forming boards or similar elements
    • E04G9/021—Forming boards or similar elements the form surface being of cardboard
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
    • E02D31/14—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against frost heaves in soil

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Lining And Supports For Tunnels (AREA)

Abstract

The invention provides a void former (10) having a spacer region (16) for spacing adjacent void formers to form channels between them. The invention further provides a spacer accessory for a void former, the accessory having a spacer region for spacing adjacent void formers to form channels between them. Yet further, the invention provides a water tolerant void former for use in contact with water containing settable compositions. The invention also provides a cover for a void former, which cover may include the spacer region and may be water tolerant, permitting reuse of the void formers with which it is used. Finally, the invention provides methods of using the void former, accessory and cover in the construction of a settable composition slab.

Description

VOID FORMERS AND A COVER FOR VOID FORMERS
Technical Field of the Invention 5 This invention relates to the construction industry. In particular, the inventionrelates to the construction of slabs cast from a settable composition.
Background to the Invention 10 The applicant is aware that presently void formers, in the form of a cardboardbox, with or without a wax coating, are used in the construction of foundationsof buildings. For the rest, the building industry use wooden and/or Steelshuttering to form voids and or réceptacles for casting a settable compositionon or in to form a slab having a desired configuration. 15
The applicant believes that the above prior art methods hâve many drawbacks, amongst which are included; the single use aspect of the cardboardvoid formers, the cost and effort required to put up wooden and Steelshuttering, and the difficulty in achieving unifomn spacing of shuttering and/or 20 void formers to define the beams of a slab. Other problems include, forexample, the difficulty in forming void formers for long span constructionssuch as bridges and the effort and cost required to provide a framework forcasting columns and pillars and/or the base portions for columns and pillars.
One typical construction method uses Steel void formers configured to definea grid of channels into which a settable composition may be cast and overwhich further settable composition is cast to form a slab having a reducedweight, and thus using less settable composition. One problem with such a 5 construction method is that the Steel void formers need to be positioned on aSteel construction to form a platform and define the channels, and once theslab has set, these must be removed, which procedure has labourimplications. The problem of removing the void formers from the set slab maybe mitigated by the pre-coating of the settable composition facing side of the 10 void formers with a releasing composition, such as an oil.
Summary of the Invention
Thus, according to a first aspect of the invention, there is provided a void 15 former having a chamber defined by one or more sidewall and at least onespacer extending laterally from the chamber for spacing the chamber of thevoid former from adjacent objects.
Typically the spacer spaces the chambers of adjacent void formers from each 20 other thereby to provide a sériés of channels for casting a settablecomposition into when forming a slab and/or beams for a slab.
The spacer may comprise one or more flap portion extendable outwardly fromthe chamber of the void former. 25 2 1 1 7 « '
The dimensions of the spacer may be selected to, in use, provide a channelwidth of suitable dimensions for the slab being cast.
The void former may be provided with a reinforcing insert to reinforce the void5 former against compression.
The reinforcing insert may be an egg-crating type insert comprising acardboard, wood, plastics or other suitable rigid material grid. îo The invention extends to a spacer accessory for a void former configured to be used with a void former.
The spacer accessory may be in the form of a collar having laterally extendingspacer portions provided thereon, the collar being sized and dimensioned 15 complementarily to the void former size and dimensions.
The invention extends further to a method of spacing void formers using aspacer as set out above, the method comprising the arranging of void formerswith the spacers in close proximity or in contact with an adjacent void former 20 or object.
According to a second aspect of the invention, there is provided a removablecover for a void former having a chamber, the cover being adapted to from abarrier between the void former and a settable composition to be cast over the 25 void former. 3
Ί -T - f / / 1 β
The cover may be in the form of a hood sized and dimensioned complementarily to the void former to be covered.
The cover may be sized and dimensioned such that a single cover covers a5 plurality of void formers.
The cover may be made of a material substantially impervious to the settablecomposition. 10 The cover may be made of a material substantially impervious to water.
The cover may hâve one or more spacer régions for spacing the chambers ofadjacent void formers to, in use, form a channel between void formers. 15 The spacer régions may be peripherally located on the cover.
Where the cover is sized and dimensioned to cover a plurality of void formers,the one or more spacer régions may located internally on the cover, forexample, by stiffened zones on a sheet. 20
The peripheral région of the cover may be sized and dimensioned to cover aspacer of the void former. 4
Z ;; Π 7 1 <
» I
Typically the cover is made from a water tolérant material, such as waxcoated cardboard, plastic, masonite, plastics sheeting, plastic coatedcardboard, laminates, treated wood, or the like. 5 The cover may be reusable or single use.
The spacer régions may be in the form of flaps extending laterally from the cover. îo According to a third aspect of the invention, there is provided a void formerhaving a chamber defined by side walls and at least one end wall, wherein atleast the end wall is provided with a suitable rigid water tolérant surface.
The end wall may be made entirely of a plastics material, masonite, wood, or 15 any suitable sufficiently rigid water tolérant material, or it may be a layered orlaminated material including a plastics, masonite, wood, or any suitablesufficiently rigid water tolérant material layer.
The void former chamber may be open at one end. Typically, the void former 20 chamber has a retaining formation provided on the open end for retaining areinforcing insert in the void former chamber.
Typically, the sidewalls are also made of the same material as the end wall. 1 * • * î f î '
The void former may be provided with a spacer extending laterally from thechamber for spacing the chamber of the void former from adjacent objects,substantially as described above. 5 The void former may be substantially parallelipipedal, typically havingrectangular and/or trapézoïdal sides.
In a useful embodiment, the sidewalls of the void former are trapézoïdal andthe or each end wall is rectangular. 10
The invention extends to a re-usable void former which can be recovered from a construction and re-used.
The void former may hâve a second end wall adapted to, in use, permit15 heaving soils to expand into the void former.
Typically, the second wall is adapted to use in heaving soil conditions byproviding it with an apertured zone, a weakened zone and/or a waterweakenable zone through which soil may expand into the void former. 6
According to a further aspect of the invention there is provided a method of constructing a settable composition slab, the method including the steps of: supporting void formers in a desired configuration such that the voidformers define a plurality of channels for receiving a settable 5 composition; covering the void formers with void former covers or hoods;casting a settable composition into at least the channels;removing the void formers once the settable composition has set; andoptionally, removing the void former covers or hoods. 10
The casting step may include casting the settable composition over the voidformers to form a slab having projecting beam portions, coffer fashion.
The removed void former covers or hoods may be reused or disposed of. 15
According to a further aspect of the invention, there is provided a void formerfor use in the construction of long span slabs, the void former being elongateand having a polygonal cross-sectional profile. 20 Typically the void former is octagonal in cross-section.
The octagonal cross-section may be obtained by two trapézoïdal box void formers sandwiching a rectangular box void former. A reinforcing grid may be provided in the void former. 7
According to yet a further aspect of the invention, there is provided a frame or réceptacle for use in casting a column from a settable composition.
The frame or réceptacle may be in the form of a cardboard box having one or5 more cardboard layers to provide sufficient rigidity.
Typically, the frame or réceptacle is used in casting a column base portion.
The invention extends to a method of casting a column from a settable10 composition, the method including the steps of: placing a frame or réceptacle made from a lightweight material such ascardboard, plastics, masonite, or laminate, on a previously excavatedand cast foot portion; 15 - optionally, inserting Steel reinforcing éléments into the frame or réceptacle; and casting a settable composition into the réceptacle.
The method may include the prior step of assembling the frame or réceptacle20 from a sheet of the lightweight material.
The frame or réceptacle may be left in situ and, for example, decorated, or it may be removed from the set settable composition. 8
Description of the Drawings
The invention will now be described, by way of non-limiting example only, withréférencé to the accompanying diagrammatic drawings. 5
In the drawings,
Figure 1 shows, in three dimensional schematic représentation, a void former,broadly in accordance with the invention; 10 Figure 2 shows, in three dimensional schematic représentation, a reinforcinginsert for a void former, broadly in accordance with the invention;
Figure 3 shows, in three dimensional schematic représentation, a top andbottom for a void former, broadly in accordance with the invention;
Figure 4 shows, in three dimensional schematic représentation, a spacer 15 accessory for use with a void former;
Figure 5 shows, in three dimensional schematic représentation, anotherembodiment of a void former in accordance with the invention;
Figure 6 shows, in three dimensional schematic représentation, a reinforcinginsert for the void former of Figure 5; 20 Figure 7 shows, in three dimensional schematic représentation, a trapézoïdalvoid former;
Figure 8 shows, in three dimensional schematic représentation, a reinforcinginsert for the trapézoïdal void former of Figure 7;
Figure 9 shows, in three dimensional schematic représentation, a cover or 25 hood for the trapézoïdal void former of Figures 7 and 8; 9
Figure 10 shows, in three dimensional schematic représentation, a plurality ofcovered void formers as shown in Figures 7 to 9, configured to form channelsfor receiving a settable composition in the construction of a slab;
Figure 11 shows, in three dimensional schematic représentation, a polygonal5 elongate void former for use in construction long span slabs;
Figure 12 shows, in three dimensional schematic représentation, a reinforcinginsert for the void former of Figure 1.1 ; and
Figure 13 shows, in three dimensional schematic représentation, a frame orréceptacle for casting a column or pillar. 10
Figures 1 shows one embodiment of a void former 10, having a chamberHdefined by four sidewalls 12, 13, 14, 15, and spacer 16 extending laterallyfrom the sidewalls 12, 13, 14, 15 for spacing the chamber 11 of the voidformer 10 from adjacent objects (not shown). 15
In use (see Figure 10 for a similar arrangement of a different embodiment ofvoid former 10), the spacer 16 spaces the chambers 11 of adjacent voidformers 10 from each other thereby to provide a sériés of channels for castinga settable composition into when formihg a slab and/or beams for a slab. 20
The spacer 16 comprises four flap portions .18, 19, 20, 21 extendableoutwardly from the chamber 11 of the void former 10.
The dimensions of the spacer may be selected to, in use, provide a channel25 width of suitable dimensions for the slab being cast. 10
I 1
In Figures 2 and 3 is shown a void former 10 provided with a reinforcinginsert, in the form of a so called egg-crate or grid 22 to reinforce the voidformer 10 against compression. The egg-crating 22 comprising a cardboard 5 (or wood, plastics or other suitable rigid material) grid.
Figure 4 shows a spacer accessory 30 for a void former configured to be usedwith a conventional void former as shown in Figures 2 and 3. îo The spacer accessory 30 is in the form of an angle section of cardboard (orplastics coated cardboard) having a laterally extending spacer portion 32provided thereon, the spacer accessory 30 being sized and dimensionedcomplementarily to the void former size and dimensions with which it is to be used. 15
An alternative embodiment of the void former 10 is shown in Figures 5 and 6in which a void former 40 is assembled from an outer channel portion 42having spacer portions or flaps 44, 46. An oppositely directed inner channelportion 48 co-operates with the outer channel portion 42 to form a chamber 49 20 of the void former 40. A reinforcing inner part 47 is receivable within thechamber 49 of the void former 40 to inhibit compression of the void former 40 in use. il
Figure 10 shows a method of spacing void formers 10 (or similar) using aspacer accessory 30 or a void former having a spacer 16, as set out above,the method comprising the arranging of void formers 10 with the spacers 16 inclose proximity or in contact with an adjacent void former 10 or object. 5
Figure 7 shows a void former 50, the sidewalls 52,53,54,55 of which aretrapézoïdal and the end wall 56 is rectangular define a chamber 57. The endwall 56 and sidewalls 52, 53, 54, 55 being made from plastic i.e. providing asuitable rigid water tolérant surface 10
Thus void former 50 can be recovered from a construction and re-used.
Figure 9 shows a removable cover or hood 60 for a void former 50 having achamber 57, the cover or hood 60 being sized and dimensioned 15 complementarily to a void former chamber 57 to be covered and, in thisembodiment, having a peripheral région 62 for spacing the chambers 57 ofadjacent void formers to, in use, form channels 66 between the void formers 50. 20 Typically the cover is made from a water tolérant material, such as waxcoated cardboard, plastic, masonite, plastics sheeting, orthe.like and may be removed for re-use.
Figure 10 illustrâtes a number of void formers 50 covered with a number of 25 covers 60 to provide a template for a slab (not shown). 12
Figures 11 and 12 show a void former 70 for use in the construction of longspan slabs, the void former 70 being elongate and having a octagonal(polygonal) cross-sectional profile. 5
The octagonal cross-section may be obtained by two trapézoïdal void formers50 sandwiching a rectangular box void former 10 between them. A reinforcinggrid 72 is provided in the void former 70. This type of octagonal void former70 can be used in the place of currently used round cylindrical void formers îo which are cumbersome and expensive.
Figure 13 shows a frame 80 or réceptacle for use in casting a column (notshown) from a settable composition. 15 The frame 80 is in the form of a cardboard box having two cardboard layers82, 84 to provide sufficient rigidity.
Typically, the frame or réceptacle is used in casting a column base portion. 20 The frame 80 is assembled from a sheet 86 of corrugated cardboard. 13

Claims (10)

Claims:
1. A structural element casting aid for use in the building industry for casting ofstructural éléments from a settable composition, said casting aid being in the form of a 5 void former having a chamber defined by one or more sidewall and an end wall which inuse faces upwards as well as at least one spacer extending laterally from the walls ofthe chamber for spacing the chamber of the void former from adjacent objects, the oneor more sidewall and end wall of the chamber being configured to support the load of thesettable composition cast onto the chamber over the void formed beneath it while the 10 settable composition sets, wherein, in use, when the spacer is contiguous with adjacentvoid formers the spacer spaces the chambers of the adjacent void formers from eachother thereby to provide a sériés of channels of required width for casting a settablecomposition for forming a slab having intégral beams or for forming beams forsupporting a slab. 15
2. A structural element casting aid as claimed in claim 1, wherein the spacercomprises one or more flap portion extendable outwardly from the chamber of the voidformer. 20
3. A structural element casting aid as claimed in claim 1, for use in the construction of long span slabs, said casting aid being elongate and having a polygonal cross-sectional profile.
I<f- 25 4.
A spacer accessory for a structural element casting aid having a chamberdefined by one or more sidewall and an end wall, said accessory being useable with acasting aid not having a suitable intégral spacer for spacing the chamber from adjacentcasting aid chambers for defining channels of required width for casting a settable5 composition for forming a slab having intégral beams or for forming beams forsupporting a slab, wherein, in usé, when the spacer accessory is used with the castingaid, the spacer accessory spaces the chambers of adjacent casting aids from each otherthereby to provide a sériés of channels of required width for casting a settablecomposition for forming a slab having intégral beams or for forming beams for10 supporting a slab, the spacer including one or more spacer portion locatable adjacent toand extendable outwardly from the casting aid sidewall.
5. A spacer accessory as claimed in claim 4, wherein the spacer accessory is in theform of a collar locatable over the casting aid and in contact with at least a portion of the 15 one or more sidewall thereof and having laterally extending flap portions providedthereon, the collar being sized and dimensioned complementarily to the casting aid sizeand dimensions.
6. A removable cover for a structural element casting aid having a chamber defined20 by one or more sidewall and an end wall, the cover being made of a water tolérantmaterial which inhibits rétention of the cover by a settable composition to be cast oversaid casting aid thereby to permit removal of said casting aid when the settablecomposition has set thereby leaving a structural element having voids thereincorresponding to said casting aid and permitting reuse of said casting aid, wherein the 25 cover is in the form of a hood sized and dimensioned complementarily to at least aportion of one or more casting aid to be covered and having a surface which is to be in 15- 11 1 ι i f contact with the settable composition of a water tolérant material which inhibits rétention of the cover by the settable composition when set.
7. A removable cover as claimed in claim 6, having one or more spacer régions for5 spacing adjacent casting aids to, in use, form a channel therebetween for the casting of the settable composition in the channel to form a structural element of substantiallyuniform dimensions in the channel.
8. A moisture tolérant structural element casting aid having one or more sidewalls, 10 a first end wall and a second end wall which in use faces downwards, in which the second wall is adapted to use in heaving soit conditions by providing it with an aperturedzone, a weakened zone and/or a water weakenable zone through which heaving soilexpands into said casting aid while having retaining means for retaining a reinforcinginsert in the chamber. 15
9. A method of constructing a settable composition structural element, the methodincluding the steps of: supporting structural element casting aids in a desired configuration such thatsaid casting aids define a plurality of channels for receiving a settable 20 composition; covering said casting aids with covers or hoods; casting a settable composition into at least the channels; and removing the void formers once the settable composition h as set thereby to provide a structural element having a plurality of voids corresponding to the void 25 formers which hâve been removed. 16 10
10. A method of constructing a foundation slab for a building without diggingtrenches by using structural element casting aids having a chamber defined byone or more sidewall and an end wall, the method including providing said casting aids with one or more spacers; arranging said casting aids on the ground, with the end wall being upwardlydirected so that the sidewalls and end wall bear the load of a settablecomposition cast thereon, in rows forming a grid with the spacers of adjacentcasting aids being contiguous to obtain a sériés of intersecting channels ofsubstantially regular width defined by the spacers between the rows of saidcasting aids so that uniform beams are castable into the channels; andcasting a settable composition into at least the channels to form the beams of the foundation slab. 17
OA1200100039A 1998-08-20 1999-08-19 Void formers and a cover for void formers. OA11711A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA987522 1998-08-20

Publications (1)

Publication Number Publication Date
OA11711A true OA11711A (en) 2005-01-26

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ID=25587224

Family Applications (1)

Application Number Title Priority Date Filing Date
OA1200100039A OA11711A (en) 1998-08-20 1999-08-19 Void formers and a cover for void formers.

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CN (1) CN1312878A (en)
AP (1) AP2001002061A0 (en)
AU (1) AU5929599A (en)
BR (1) BR9913059A (en)
OA (1) OA11711A (en)
WO (1) WO2000011281A1 (en)

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CN1904264B (en) * 2003-10-01 2010-04-21 邱则有 Mould shell construction unit
CN101187233B (en) * 2003-10-21 2013-01-02 湖南邱则有专利战略策划有限公司 In situ casting concrete hollow building board
CN101220638B (en) * 2003-10-21 2011-10-05 湖南邱则有专利战略策划有限公司 Cast-in-situ concrete hollow slab
CN101187232B (en) * 2003-10-21 2013-01-02 湖南邱则有专利战略策划有限公司 In situ casting concrete hollow building board
CN1800545B (en) * 2004-12-31 2010-05-05 邱则有 Reinforced bar concrete hollow slab
CZ297936B6 (en) * 2005-02-22 2007-05-02 Jasan@Petr Floor construction and process for making the same
JP6378563B2 (en) * 2014-07-10 2018-08-22 フジモリ産業株式会社 Void material for concrete
US11649649B2 (en) * 2019-01-11 2023-05-16 American Forming Products Llc Concrete form apparatus and method of using
CN112227598A (en) * 2020-08-24 2021-01-15 江苏东尚住宅工业有限公司 Prefabricated slab with built-in cavity and manufacturing method
CN112160480A (en) * 2020-09-22 2021-01-01 湖南弘久建材科技有限公司 Assembly type combined box mold # -shaped hollow floor structure and construction method thereof
DE102021121580A1 (en) * 2021-08-19 2023-02-23 richter & heß VERPACKUNGS-SERVICE GmbH shaping system

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Also Published As

Publication number Publication date
BR9913059A (en) 2001-05-08
CN1312878A (en) 2001-09-12
AU5929599A (en) 2000-03-14
AP2001002061A0 (en) 2001-03-31
WO2000011281A1 (en) 2000-03-02

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