Patent Application
20050005556
The present invention relates to an improved composite building block and a method of construction using such building blocks using a selected blend of ingredients forming a mortar matrix and an insulating element. More particularly, the present invention relates to an insulting element for use in the construction of a composite building block and in wall constructions using such building blocks. More particularly the present invention provides a building block and a wall constructed from such blocks having superior waterproofing, thermal and insulating properties due to the use of the insulating element.
There are in existence a wide variety of building blocks each tailored to suit an individual application.
Numerous construction materials have been provided in the prior art. For example, U.S. Pat. No. 5,230,195 to Sease; U.S. Pat. No. 5,365,714 to Potvin; U.S. Pat. No. 5,471,808 to DePieri et al. and U.S. Pat. No. 5,505,034 to Dueck all are illustrative of such prior art and are incorporated by reference herein. While these units may be suitable for the particular purpose to which they address, they would not be as suitable for the purposes of the present invention to be described herein below.
U.S. Pat. No. 5,230,195 discloses an insulating molded plastic building unit comprising a rectangular parallelepiped without a rear wall. One or more alignment bosses extending upwardly and outwardly from an upper wall of the building unit are equidistantly spaced from a front face and a side face thereof to cooperatively align with alignment sockets of automatically space superimposed building units. Each building unit has vertical and diagonal webs for structural reinforcement thereof. Cavities within each building unit can be filled with insulating material to enhance the insulating characteristics thereof. A plurality of the building units are laid in courses with joints formed therebetween with waterproof adhesive.
U.S. Pat. No. 5,365,714 discloses a wall for a rampart or building, consisting of a plurality of building blocks, each comprising slightly compacted sawdust or wood chips glued with resin. The building blocks are interconnected by a number of assembling pins and by recesses integral to the respective blocks, so as to frictionally engage into one another. There are also provided full length projections and corresponding grooves of the respective blocks for the same purposes. The structure is remarkable by the quality of the joints and by the ease and quickness of its assembly or disassembly.
Another building block is disclosed in U.S. Pat. No. 5,471,808. The building block has a hollow body with lateral surfaces which bear a decorative finish, a flat upper surface having studs protruding therefrom, and a bottom opening defining seats for accommodating the upwardly protruding studs of an underlying block. A frog is formed in the flat upper surface for permitting the introduction of an adhesive medium between adjacent blocks. The block can be provided with a framework having an upper frame and legs for interposition between adjacent blocks.
U.S. Pat. No. 5,505,034 discloses a block for forming a retaining wall comprising a generally parallelepiped body with front, rear, top, bottom and side surfaces and a central internal cavity with internal walls. Integrally formed protruding knobs are formed on the bottom surface adjacent the front surface and are positioned for protruding into the central cavity of at least one other block in a wall formed from the blocks.
None of the above examples of the prior art disclose a building block manufactured in accordance with the method to be described herein and which have improved insulating properties.
The present invention provides an alternative to the known building blocks and particularly lightweight blocks having improved insulating and moisture resistance properties. In its broadest form the present invention comprises:
In another broad form the present invention comprises:
In another broad form the present invention comprises:
In another broad form the present invention comprises:
In another broad form the present invention comprises:
In another broad form the present invention comprises:
In another broad form the present invention comprises a method of construction of a block wall having an insulating layer; wherein the method comprise the steps of:
In another broad form the present invention comprises:
In another broad form of a method aspect the present invention comprises:
According to one embodiment, the method comprises the additional step before placing said polystyrene element in said mould of providing means on the mould to allow the element to key into said matrix. Preferably the mould comprises walls defining an internal space but without a base or lid so that a through passage is provided. Preferably, the moulds are four sided but it will be appreciated that composite blocks of alternative shapes and configurations may be formed by alternative mould shapes.
According to a preferred embodiment, the polystyrene element is generally elongate but includes on at least one surface, projections which “key” into the cementitious matrix to ensure that the insert always retains its predetermined disposition and unwanted movement is prevented.
In another broad form of the method aspect the present invention comprises:
According to a preferred embodiment, the flowable material is a foaming polyurethane or styrene or like product. The foaming product is preferably low density and fully penetrates the cavity formed between said blocks to form an insulating layer imparting to the building block superior insulating properties and a barrier to moisture. Preferably two opposing bricks are placed with keys facing each other set to a predetermined width.
The present invention will now be described in more detail according to a preferred but non limiting embodiment and with reference to the accompanying illustrations wherein;
Preferably, element 1 comprises a prismic body made from a material having high insulating properties and is insertable adjacent or in at least one said building blocks to thereby provide a thermal and water barrier to at least one face of each said building blocks. In a preferred embodiment, Element 1 is a generally elongate and approximates the length of a brick which with it will be used. For the purpose of integral engagement of element 1 and an adjacent brick or block, element 1 may according to one embodiment, typically comprise a generally elongate body 2 comprising a top 3 side walls 4 and 5, end walls 6 and 7 and bottom 8. Wall 4 includes dovetail formations 9, 10 and 11 and wall 5 includes formations 12, 13 and 14. Each formation provides a keying in profile for mutual engagement between element 1 and a block not shown. Formations 9-14 allow element 1 to embed in a cementitious matrix formed for construction of a construction block with which element 1 is suitable for use. Element 1 may be of definite length as shown in
Formations 9-14 are preferably angled at approximately 75 degrees but it will be appreciated that this and other dimensions of the formations may be varied according to prescription.
The formations are a predetermined width, depth and shape so as to maximise the keying or binding effect between element 1 and it's adjacent construction block without encroaching too deeply into the body 2 of element 1. Each key formation 9-14 may be spaced apart so that each is offset to its counter part on an opposite wall. Element 1 of
According to one embodiment, element 70 preferably protrudes past a block end forming tongue 76 but leaves a concave 75 at its opposite end. The tongue and groove arrangement creates a continuous unbroken styrene section from block to block so as not to compromise the R value in perpendicular joints. The tongue and groove arrangement ensures that each block is perfectly aligned with it's neighbouring blocks, thus reducing the risk of human error in laying the blocks. The tongue and groove also ensures the perpendicular joints are of equal width and reduces the possibility of air flow and water penetration through the perpendicular joints as a result of poor brick laying.
According to a preferred embodiment blocks referred to throughout this specification are preferably made from a cementitious matrix which includes cellulose or timber aggregate. However, it will be appreciated that other matrix mixes may be used according to requirements.
The polystyrene elements described herein are adapted for integral attachment with at least one said building blocks such that a composite building element comprising polystyrene element and at least one said blocks is formed.
According to one method aspect, construction of a block wall having an insulating layer; comprises the following steps. First a mould is prepared for forming building blocks. A cementitious matrix is mixed for formation of the blocks.
At least one element having insulating properties is placed in the mould., whereupon a cement slurry is poured into the mould such that the matrix engages mould surfaces and at least one surface of the element. The matrix is allowed to dry/set for a predetermined period of time whereupon the at least one block and at least one element is separated from said mould. A structure such as a wall is then constructed using the composite blocks formed from the integrally attached block and insulating element. The so formed structure has increased insulating (and waterproofing) properties by virtue of the at least one element.
According to one embodiment, the method comprises the additional step before placing the polystyrene insert in said mould of providing means on the mould to allow the element to key into the matrix. Preferably the mould comprises walls defining an internal space but without a base or lid so that a through passage is provided. Preferably, the moulds are four sided but it will be appreciated that composite blocks of alternative shapes and configurations may be formed by alternative mould shapes.
In another embodiment, there is provided a method of preparation of a structure formed from clay fired building blocks prepared in a mould. A finished block includes surface formations therein on at least one surface, such that at least two blocks are placed so that the formations on at least one surface of the two blocks are in spaced apart but in opposing relationship to form a cavity therebetween. The cavity between at least two blocks with a flowable material capable of filling the cavity. Preferably the flowable material is a foaming polyurethane or styrene or like product. The foaming product is preferably low density and fully penetrates the cavity formed between said blocks to form an insulating layer imparting to the building block superior insulating properties and a barrier to moisture.
Preferably each block is single skin and load bearing so as to reduce the cost and increase the speed of building and to increase the R value (insulation). A styrene insert of approximately 40 mm width will increase the R value of a standard 200 mm wide block made from a timber aggregate from 0.92R to 2.25R.
The polystyrene insert elements reduces all water and moisture penetration through the block wall. They also improve the ease, speed and accuracy of block laying (especially when using a matrix including timber for the construction blocks), eliminate the need for control or expansion joints and increase bond strength between blocks. The insert elements also contribute to an increase in overall stability of a block wall during earth tremor or quake and decrease the chance of cracking due to movement in the footing or slab. Further, the blocks may be nailed with all size nails and screws without the need for pre-drilling or wall plugs.
The styrene elements are preferably disposed midway of the width formed by two opposing blocks for the following reasons:
This composite including block and styrene insert will dramatically improve all cement stabilised blocks and fired clay blocks such as:
Blocks manufactured from a cementitious matrix which includes timber derivatives adds to the overall R (thermal rating) value yet has better thermal mass than other products such as foam concrete (aerated concrete). It is light weight yet strong material. This means that the thickness of the Timbercrete section on either side of the styrene insulating element can be wider than conventional bricks or blocks. As a result there is a greater surface face area which means greater bond wrench strength. Also, the overall load bearing capacity of a wall constructed from the blocks is increased. Due to the lighter density and greater surface area of timber based aggregate blocks compared to solid concrete products, are lighter and stronger are non-combustible and have low conductivity, offering a better fire rating than most.
The composite according to the invention including the integral insulating element is non brittle and has elastic memory and thus is less likely to crack when subject to bending pressures. Tests show that a 150 mm long×5 mm wide nail can be hammered directly into the corner of a block without splitting or cracking the block. In the same way any size or shape self tapping screw will enter without the need for pre-drilling or wall plugs.
The blocks may be provided in a variety of shapes and colours offering originality and creativity. According to a method aspect the moulds used in the construction of the blocks may be provided in different shapes and sizes. Setting time is longer than the known method of timber aggregate block construction and a reduced slump parameter is preferred. Regardless of what masonry product is used the viscosity of the matrix is critical to an effective product. The matrix material used must be viscous enough to flow into all formations or wedge shaped keys of the insert elements described above thereby creating a sound bond between styrene insert and its adjacent masonry block. Care must be taken to remove the mould only after prescribed setting times.
Blocks according to the invention have mortar joints which are much thinner (preferably 5 mm) than traditional brick work which is normally 10 to 15 mm thick.
Block corners on the ends and top (one or more sides) may be completed with a pronounced chamfer approximately 20 mm diameter. The chamfer on the corners and edge of the block is preferably rounded. The top and two ends of block face may have a smooth convex shape creating a three sided convex frame with a split face half oval centre.
When the moulds are removed lifting it in its entirety (without dissembling), a small slump occurs. The slump need only be 1.5-2 mm. The wet blocks subsequently rest against each other in some places. The two blocks will join at random places and when separated random patterns occur.
The composite block including the insulating element is non brittle and has a limited elastic memory with a thin flexible mortar having a strong binding quality, will produce a wall that has many unique qualities. There is a reduced need for control and expansion joints and reduction in the risk of cracking from movement of footings or slabs.
Other insert element with insulating properties can be substituted for polystyrene such as polyurethane, foamed rubber, foamed concrete, vermiculite glued so as to make a board, fly ash also glued together and other low density mineral products. Organic inserts could include glued low density sawdust so as to make a board. In similar fashion the use of straw or other grass like materials. Also rice husks glued together into a board or matted insert could be used as a substitute for a polyurethane insulating element. All such products have been considered but H grade or VH grade extruded styrene is the preferred choice for the following reasons. H grade or VH grade styrene is stronger than most other suggested alternatives. H grade or VH grade styrene has a higher R value per centimeter than the other comparable materials. The cost and ease with which extruded styrene is produced makes it commercially viable.
The styrene insert may vary in thickness to satisfy the particular R value that is needed to meet the required standard that varying climatic conditions and government regulations require. The styrene insert may be offset to one side or the other however a centrally located insert is preferred. Cavity blocks may be constructed but the solid light weight block is preferred because of its greater surface face area for load bearing and bond wrench capabilities. Also, with cavity blocks load bearing requirements often dictate the need to fill the cavity with concrete. This significantly increases the overall costs.
A mould with alternative mould formations may be used for the production of alternative radii blocks according to an alternative embodiment. Thus, depending upon the radius size of the insert selected, this will produce blocks having a rock face with a predetermined radius and therefore a predetermined finish.
Block arrangement 95 comprising a first block 96 and opposing block 97 defining a space 98 therebetween. Space 98 receives and retains therein an element 99 which fills space 98. Element 99 may be disposed is in a manner which allows formation of a female gender recess 100 and male profile part 101 which both facilitate opposite gender engagement with end to end opposing blocks (not shown).
Since element 99 is totally solid, this will facilitate a higher R value in the region of 2.35 depending upon the thickness of blocks 96 and 97.
It will be appreciated by persons skilled in the art that numerous variations and modifications may be made to the invention as broadly described herein without departing from the overall spirit and scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2003901351 | Mar 2003 | AU | national |
