ZA200109140B - Retaining wall system with interlocked wall-building units. - Google Patents

Description

26-03-2001 CA 000000370 + ; - .

A1is0, it is known to build retaining waiis with biocks of various kinds. Such blocks, in the prior art, generally need to be made with interfitting parts or be affixed by concrete or the like in order to make a secure stable retaining wall.

Japanese Abstract JP-A-06-322730 published November 22, 1994 shows the use of a disc-like solid with a projection on both sides to prevent slippage between bags of ready-mix concrete in a retaining wall. However, such device can prevent slippage only between two vertically-adjacent bags. Japanese abstract JP-A-59- 048525 published March 19, 1984 shows the use of sand and soil bags provided integrally on the ends of water-permeable sheets which extend into fill in back of a vertical bank.

Summary of Invention

The invention provides a permanent retaining wall struc- ture in which the wall-building units, such as sand/soil bags, used to make the face of the structure are attached to wall-building units in adjacent courses, and preferably to geogrid sheets. The attachment is 7 done by means of a plate having projections on both sides thereof which protrude into the wall-building units in adjacent courses, and which also protrude through the holes in the geogrid sheets, stabilizing the retaining wall structure and backfill.

In one embodiment of the invention, the wall-building units are bags of sand, soil or similar fill materiai. In this specifica- tion, "“sand/soil bag" means a bag filied with any suitable fili material,

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26-03-2001 CA 000000370 ‘ - J inciuding sand, soii, mixtures thereof and inciuding fili mixed with seeds for grass or other plants. In another embodiment, the wall- building units are units that harden, or that can be made to harden, after they are placed in the wall and interconnected together by means of the attachment devices of the invention. Examples are freshly- formed bricks of clay or similar material prior to their hardening; or bags of cement or a mixture of cement and aggregate that can be made to harden by wetting them and allowing them to cure after they are set in place. Such wall-building units are collectively referred to as "hardenable building units" in this specification. Thus "wall-building units" can be either "sand/soil bags" or "hardenable building units," the distinction being that the former have fill that remains friable after the wall is made and the latter harden or cure after the wall is con- structed, forming rigid units.

The invention provides a retaining wall structure compris- ing a first plurality of wall-building units positioned adjacent to one another forming a first, horizontally-extending course; a second plurality of wall-building units positioned adjacent to one another CT above the first course forming a second course; and interconnecting members placed between the first and second courses attaching them together. The interconnecting members comprise a plate having an upper side and a lower side, a first set of projections on the lower side and a second set of projections on the upper side, the projections being capable of protruding into a wail-building unit. The interconnecting members are positioned between the wali-building units of the first and second courses so that the first set of projections protrudes into a unit

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26-03-2001 CA 000000370 - a. in the lower course and the second set of projections protrudes into a unit in the upper course. The interconnecting members may also be placed on the ground or on a footing, under the base course of wall- building units.

The retaining wall structure. can optionally comprise a sheet of geogrid extending from between adjacent courses into backfill behind the retaining wall. The geogrid sheet is positioned so that projections of the interconnecting member protrude through holes in the sheet.

The invention also provides an interconnecting member for attaching a first horizontally-extending course of wall-building units to a second horizontally-extending course positioned vertically adjacent to the first course. The member comprises a plate having an upper and lower side with a set of projections on each side capable of pro- truding into a wall-building unit. The projections can also serve the function of providing attachment means for a sheet of geogrid, but preferably, the interconnecting member includes a set of geogrid- BN holding members on the upper side of the plate that are shaped and adapted specifically to protrude through holes in a sheet of geogrid.

There may be retaining caps affixed to the geogrid-holding members for retaining a sheet of geogrid thereon. The interconnecting member may also have a flange around the base of each projection on the upper side of the piate, having a lip for sealing against a wall-building unit.

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26-03-2001 CA 000000370 = 5.

The retaining wall siructiire can also optionally include cover plates to improve the durability and appearance of the wall.

The invention also provides a method of constructing a retaining wall structure having a plurality of courses of wall-building units. The method comprises the steps of placing a first plurality of wall-building units adjacent to one another to form a first, horizontal- ly-extending course; placing interconnecting members on the first course, the interconnecting members having a first set of projections on their lower side and a second set of projections on their upper side, such that the projections in the first set protrude into wall-building units in the first course of wall-building units; and placing a plurality : of wall-building units adjacent to one another to form a second course above the first course, such that the projections of the second set protrude into wall-building units of the second course. The method of constructing a retaining wall can include the step of placing a sheet of geogrid extending from between the courses of wall-building units into the backfill, with projections of the interconnecting member protruding through holes in the geogrid to anchor it in place. cE

Brief Description of Drawings

Fig. 1 is a cross-sectional end view of a retaining wall structure according to one embodiment of the invention;

Fig. 2 is a perspective view of cne embodiment of an interconnecting member;

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26-03-2001 CA 000000370 rig. 3 is a cross-sectional view on the iine 3 - 3 of Fig. 2;

Fig. 4 is a perspective view of a course of sand/soil bags with interconnecting members positioned thereon;

Fig. 5 is a cross-sectional view through adjacent, intercon- nected sand/soil bag courses;

Figs. 6(a) to (e) illustrate steps in a method of construct- ing a retaining wall structure;

Fig. 7 - 10 are perspective views of alternate embodiments of the interconnecting member;

Figs. 11(a) to (c) are perspective views of the cover plate assembly and the parts thereof;

Fig. 12 is a perspective view of a wall with the cover plate assemblies affixed thereto; CT

Fig. 13 is a perspective view of a further embodiment of the interconnecting member;

Fig. 14 is a cross-sectional view on the line 14 - 14 of

Fig. 13, and including an attached sheet of geogrid; :

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Fig. 15 is a perspeciive view of a further emvodiment of the interconnecting member;

Fig. 16 is a cross-sectional view on the line 16 - 16 of

Fig. 15, and including an attached sheet of geogrid,

Fig. 17 is a perspective view of a further embodiment of the interconnecting member;

Fig. 18 is cross-sectional view on the line 18 - 18 of Fig. 17, and including an attached sheet of geogrid,; g Fig. 19 is a perspective view of the further embodiment of the interconnecting member,

Fig. 20 is a cross-sectional view on the line 20 - 20 of

Fig. 19, and including an attached sheet of geogrid,

Fig. 21 is a perspective view of a further embodiment of the interconnecting member,

Fig. 22 is a cross-sectional view on the line 22 - 22 of

Fig. 21, and including an attached sheet of geogrid;

Fig. 23 is a perspective view of the further embodiment of the interconnecting member,

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Fig. 24 is a cross-sectionai view on the iine 24 - 24 of

Fig. 23, and including an attached sheet of geogrid;

Fig. 25 is a perspective view of a further embodiment of the interconnecting member;

Fig. 26 is a cross-sectional view on the line 26 - 26 of

Fig. 25, and including an attached sheet of geogrid,

Fig. 27 is a perspective view of a further embodiment of the interconnecting member;

Fig. 28 is a cross-sectional view on the line 28 - 28 of

Fig. 27, and including attached sheet of geogrid,

Fig. 29 is a perspective view of a further embodiment of the interconnecting member;

Fig. 30 is a cross-sectional view on the line 30 - 30 of "

Fig. 29, and including an attached sheet of geogrid; and

Figs. 31 - 33 are perspective views of three further embodiments of the interconnecting member.

Description

Referring to Fig. 1, retaining wall structure 10, con- structed on ground 12, comprises a plurality of horizontaily-laid

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26-03-2001 CA 000000370 courses of sand/soii bags i4, the courses being arranged verticaiiy in a wall structure. The face of the wall may be sloped, rather than vertical, if so preferred for a particular application. The bags 14 are preferably made of a geotextile material which is durable and of a weave which permits water to flow in and through the bag, and seed- lings to grow out, while retaining fine soil particles within the bags.

The material of the bags 14 should not be biodegradable, for durability of the wall.

Backfill 16 is compacted behind and supported by sand/soil bags 14. Geogrid sheets 18 extend horizontally back into the backfill from between courses of sand/soil bags 14, affixed thereto as described hereunder. Interconnecting members 26 are placed between the adjacent courses of sand/soil bags 14.

Referring to Figs. 2 and 3, interconnecting member 26 comprises a plate 22, generally rectangular and planar in a preferred embodiment, with a plurality of projections 24 extending vertically from both sides of the plate 22. Projections 24 are sufficiently strong i and pointed to protrude into sand/soil bags 14. Interconnecting mem- ber 26 is preferably made of plastic or aluminum or other non-corros- ive metal or material.

Referring to Figs. 4 and 5, interconnecting members 26 are used in the construction of a retaining wail structure 10 by placing them on top of sand/soil bags 14 in a course so that projections 24 on the lower side protrude into the bags. A second course of bags is

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26-03-2001 CA 000000370 piaced on top of the first course and of interconnecting members 26.

The projections on the upper side of member 26 protrude into the bags in the second course, and the weight of those sand/soil bags presses the interconnecting members so that the projections on their lower side protrude fully into the bags in the first course. The projections 24 can be configured to fully penetrate the bags or, preferably, to simply indent them. In either case, the projections are considered to "pro- trude” into the bags.

The interconnecting members 26 are also used to anchor geogrid sheets to the sandbags. Geogrid sheets 18 are known and commercially available plastic mesh products commonly used for soil reinforcement. Referring to Fig. 5, geogrid sheet 18 has a plurality of holes 28 therein. The sheet 18 is affixed to the face of the wall by placing the edge of the sheet over interconnecting members 26 atop a course of sandbags 14 so that the projections 24 on the upper side of the interconnecting member and adjacent its back edge protrude through holes 28 in the geogrid. When the next upper course of bags 14 is put on top, projections 24 on the upper side of the interconnect- oT ing member, extending through the geogrid sheet, protrude into the underside of the bags in said upper course.

Instead of being placed over an interconnecting member 26, the geogrid sheet can be placed directly on top of a course of sand/soil bags and the interconnecting members placed over it, with the projections 24 on the lower side of the member 26 protruding down through holes 28 in the geogrid sheet and into the bags. In

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26-03-2001 CA 000000370 other words, ihe geogrid can be placed under the interconnecting member instead of over it.

Geogrid sheets are installed at selected levels during the construction of the wall, for example on top of every third course of bags, or as required for a particular application.

Fig. 6 illustrates the steps in a preferred method of con- structing a retaining wall structure according to the invention. Refer- ring to Fig. 6(a), a trough 30 is dug in ground 12, with the base of the trough being suitably prepared with a levelling pad or a concrete footing in order to support the wall. Such preparation is conventional in the building of retaining walls. A first course of sand/soil bags 14 is laid in trough 30 (Fig. 6(b)). A row of interconnecting members 26 is placed on top of bags 14 in the first course (Fig. 6(c)). Next, a further course of bags 14 is laid, and backfill 16 is placed and com- pacted in back of the sand/soil bags. A row of interconnecting mem- bers 26 is laid on it and then a further course of bags 14 (Fig. 6(d)).

Then, a row of interconnecting members 26 is placed along the upper- : most course of bags 14 and a sheet of geogrid 18 is placed on it, extending back along the surface of the backfill 16 (Fig. 6(e)). The construction of the wall is continued in the same manner, until a retaining wall of the required height is completed, as shown in Fig. 1.

In some applications, it is desirable to place interconnect- ing members 26 on the ground under the base course of bags 14.

Here, a row of interconnecting members 26 is placed on the levelling

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26-03-2001 . CA 000000370 pad or concrete footing and the first or base course of bags 14 is placed on it. The wall is then further constructed as described above.

This reduces movement or slippage of the base course of bags and assists in their being properly positioned.

According to one embodiment of the invention, bags 14 include seeds of grass or other ground covers mixed in their fill :

After the retaining wall is built, the bags are watered, naturally or artificially, and the ground cover plants grow out of the bags, provid- ing a green foliage face on the retaining wall.

According to another embodiment of the invention, the : | bags do not include seeds but are instead made in shapes which, in a completed wall, will form an attractive wall face. For example, the face side of the bags can be rectangular, square or hexagonal, to permit the construction of a wall face with any of various interlocking patterns. The bags can also be of transparent material, such as plastic, and in such case the fill can be decoratively colored. For example, the fill can be green-colored gravel. ;

Figs. 7 - 10 illustrate alternative embodiments of the inter- connecting member. In these embodiments, the interconnecting member has different shapes to permit optimal interlocking of bags of various shapes and in various arrangements. Rounded or shapeless bags may have gaps between adjacent bags in a course such that an interconnecting member extending across such bags is not fully sup- ported across such gap by the lower bags. Iu such cases it is prefer-

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26-03-2001 : - CA 000000370 i 13 - able to use an interconnecting member with a Cui-out in the unsup- ported area, so that an upper bag does not press down on an unsup- ported part of the interconnecting member. In Fig. 7, interconnecting member 126 comprises plate 122 with projections 24 on both sides thereof. The plate 122 is generally C-shaped with a space or cut-out 123 between the arms of the C. The interconnecting member 126 is positioned between courses of sand/soil bags such that the space 123 is above the gap between adjacent bags in the lower course. A portion of the bag in the upper course extends through the space 123 and rests directly on the lower bags. Also, the design of Fig. 7 permits a reduction in the amount of plastic or other material required for the member and is accordingly less costly. A similar design is shown in

Fig. 10, in which interconnecting member 226, having projections 24 on both sides thereof, is in the form of a generally trapezoidal frame with a cut-out 52 in the middle thereof. As with the embodiment of

Fig. 7, this interconnecting member permits part of the upper bag to rest directly on the lower bags while still interlocking bags in adjacent courses together. The narrower side of the trapezoidal frame is intended to be positioned rearward, with the geogrid attaching only to h said narrower side. Again, such design effects a cost savings with regard to the amount of material required to make the interconnecting member.

Two further alternate configurations are shown in Fig. 8 and Fig. 9. In Fig. 8, interconnecting member 326 is a piate that is hemi-cylindrical in shape. In Fig. 9, interconnecting member 426 is a plate that is L-shaped. Both these forms of interconnecting members

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26-03-2001 CA 000000370 are adapted for use in interiocking sand/soii bags of the appropriate . shapes. For example, the plate of Fig. 9 can be used where the bags 14 have a face or cross-section that is hexagonal. The plate of Fig. 8 can be used where the cross-section of the bags is round. The shaping of the plate, as in Figs. 8 and 9, to fit shaped bags ensures secure contact between the plate and the bags. It will be apparent that the interconnecting member can be configured as required to interlock sand/soil bags of any desired shape.

In another embodiment of the invention, the wall-building units are hardenable building units. For example, the hardenable building units can be freshly-formed bricks of clay, concrete or similar material used prior to their hardening; or they can be bags of cement or a mixture of cement and aggregate that can be made to harden by wetting them and allowing them to cure after they are set in place; or any similar material that is sufficiently soft to be penetrated by the projections of the interconnecting members but which hardens (for ~ example by drying out, as in the case of a clay or concrete brick) or that can be made to harden (for example by wetting and then allowing a to cure, as in the case of a bag of cement or cement and aggregate) after it is set in place. The hardenable building units must be firm enough at the time of use to retain their form and to be stackable, i.e. capable of being stacked without collapsing or breaking. In the case of freshly-formed clay or concrete blocks, such blocks should be semi- hardened. A retaining wall made in accordance with this embodiment of the invention, using hardenable building units, is made in the same : manner as described above for retaining walls where the wali-building

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26-03-2001 CA 000000370 ] S15 - units are sand/soil bags. Here, the method of making a retaining wall includes the additional step of allowing, or causing, the hardenable building units to harden. For example, where the hardenable building unit is a clay brick, it is used in the construction of the retaining wall when it is still soft enough to be easily penetrated by the projections 24 of plate 122. As the wall is built, the clay bricks gradually cure and harden. Where the hardenable building unit is a bag of cement, or cement and aggregate, it is used in the same manner as the sand/soil bags as described above to construct the retaining wall; then, the bags are wetted and allowed to cure, causing the cement or cement and aggregate in each bag to harden. As described above in respect of the construction of walls made from sand/soil bags, a row of interconnect- ing members 26 can also be used under the base course of hardenable ‘building units.

Figs. 13 and 14 illustrate a further embodiment of the interconnecting member. Interconnecting member 60 comprises a plate 62, generally rectangular and planar in a preferred embodiment, with a plurality of projections 64 extending perpendicularly from both i sides of the plate. A set of geogrid-holding members 66 extends perpendicularly from the upper side of the plate along an edge thereof.

Unlike the embodiment of Fig. 2, in which projections 24 serve both to attach the geogrid and to protrude into the wall-building units, geogrid-holding members 66 of interconnecting member 60 are specifically shaped to provide a very secure means of attachment to the geogrid. Geogrid-holding members 66 have relatively steep, almost vertical walls, and are sized and arrayed in a row along the edge of

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26-03-2001 CA 000000370 the piate to fit snugly into adjacent hoies along the edge of ihe sheet of geogrid. Cap 67, which can be made of rubber or similar material, fits snugly over the top end of a member 66 and can optionally and preferably be put in place on one or more of members 66 after the geogrid 18 is fitted over the members 66 in order to better secure the attachment of the geogrid to the interconnecting member. The outer diameter of the cap 67 is larger than the diameter of the holes in the geogrid, thus restraining the geogrid from slipping up and off the members 66. The geogrid sheet 18 fits and is held on the member 66 between the plate 62 and the lower edge of the cap 67.

Projections 64 are preferably formed in plate 62 by . pressing and molding the plate, resulting in a corresponding depression 68 in the opposite side of the plate. However, the projections can also be solid, as in the embodiment of Fig. 2.

As shown in Figs. 13 and 14, a protruding ring or flange 70 is provided around the base of each projection 64 on the upper side of plate 62. The flange has an upper end or lip 72. Flange 70 has i particular application when the interconnecting member is used in a wall in which the wall-building units are sand/soil bags. Here, there is a possibility that some of the projections 64 may puncture the bag placed on top of the interconnecting member, causing a leakage of sand from the bag. The function of flange 70 is to reduce such leak- age by pressing against the bag and forming a seai around the projec- tion 64 sufficient to reduce or stop the leakage of sand or soil from the hole. Optionaliy, and as iliustrated in Figs. 13 and 14, a flange 70

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26-03-2001 | CA 000000370 may aiso be provided on ihe lower side of the plate 62 tc reduce leakage from a bag underneath plate 62 that is punctured by a projec- tion 64 on the underside of plate 62.

The interconnecting member 60 can be configured so that, in use, the geogrid-hoiding members 66 are covered by the sand/soil bags that are above them. In this case, the distance between the row of members 66 and the row of projections 64 that is nearest to it is relatively small, so that the sand/soil bag on top of the interconnecting member 60 covers both the projections 64 and the geogrid-holding members 66. Alternatively, the interconnecting member 60 can be configured so that, in use, the geogrid-holding members 66 are not - covered by the sand/soil bags that are above them. In this case the distance between the row of members 66 and the row of projections 64 that is closest to it is relatively large, so the section of the plate 62 bearing members 66 extends beyond sand/soil bags and is not covered by them. In this case, holes (not illustrated in the drawings) can be provided in plate 62 in the region between the row of geogrid-holding members 66 and the nearest row of projections 64 to facilitate water drainage through the retaining wall, and also to economize on material, i.e. to permit cheaper fabrication of the interconnecting members. It will be understood that these features, though described in relation to the embodiment of Figs. 13 and 14, can equally be applied to the embodiments illustrated in Figs. 15-16, 17 - 18, 19 - 20, 21 -22,23 - 24, 25-26, 27 - 28 and 29 - 30.

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26-03-2001 CA 000000370 i - 18 -

Figs. 15 and 16 show an alternative embodiment of the interconnecting members of Figs. 13 and 14. The structure of inter- connecting member 80 is the same as that of interconnecting member 60 shown in Fig. 14 except for the lip of the flange. Interconnecting member 80 has a flange 74 with a lip having two concentric ridges 76 with a concentric depression 78 therebetween. Both ridges 76 press against a sand/soil bag placed on top of the interconnecting member : 72, forming, in effect, a double seal. The concentric ridges 76 on a lip may be the same height or different heights. In the latter case, the outer ridge 76 is preferably somewhat higher than the inner ridge, as illustrated in Figs. 15 and 16, the object being to achieve the most effective seal possible around a projection 64 against a sand/soil bag punctured thereby. As for the embodiment of Figs. 13 - 14, the flange 70 and ridges 74 may be on the upper side only of the interconnecting member or, optionally, on both the upper and lower sides.

It will be apparent that the geogrid-holding members 66 of the interconnecting member 60, 80 is a feature that can also be incor- porated into the structure of the embodiments of the interconnecting § member shown in Figs. 2, 7 and 10; it is not limited to use in inter- connecting members having flanges as depicted in Figs. 13 - 16. Nor is the feature of flanges limited to interconnecting members having geogrid-holding members 66; either feature can be included in an interconnecting member with or without including the other.

Figs. 17 and 18 illustrate a further embodiment of the interconnecting member, indicated by reference numeral 90, which is

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26-03-2001 CA 000000370 substantially the same as the embodiment of Figs. 13 and 14 except : that the feature of sealing flanges around the projections 64 is not included.

Figs. 19 - 30 illustrate embodiments of the interconnecting member in which the geogrid-holding members are configured in other forms for effective attachment to a sheet of geogrid.

Referring first to Figs. 19 - 24, geogrid-holding member 94 is generally L-shaped, having a first, upright part 96 that projects upward from the plate 62, and a second, horizontal part 98 extending from the upright part towards the projection 64. When a sheet of geogrid 18 is fitted over retaining members 94, by inserting part 98 into a hole in the geogrid and pulling the geogrid down onto the upright part 96, the horizontal part 98 restrains the sheet from slipping off the retaining members 94.

Figs. 19 and 20 illustrate an embodiment of the intercon- necting member, indicated by reference numeral 95, having geogrid- - holding members 94. The structure of the remainder of the intercon- necting member 95 is the same as the embodiment illustrated in Figs. 13 - 14.

Figs. 21 and 22 illustrate a further embodiment of the interconnecting member, indicated by reference numeral 100, having geogrid retaining members 94. The structure of the remainder of the

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26-03-2001 CA 000000370 interconnecting member 100 is the same as the embodiment illustrated in Figs. 15 - 16.

Figs. 23 and 24 illustrate a further embodiment of the interconnecting member, indicated by reference numeral 102, having geogrid-holding members 94. The structure of the remainder of the interconnecting member 102 is the same as the embodiment illustrated in Figs. 17 - 18.

Referring next to Figs. 25 - 30, geogrid holding member 104 is a tapered post with a relatively narrow base 109 and a relatively wide top 108. Member 104 is generally rectangular in horizontal cross-section. The side 106 nearest the projections 64 slopes towards the projections 64 in the upward direction. The top 108 of the mem- ber 104 is sized and configured to fit snugly into a hole in a sheet of geogrid. When a sheet of geogrid 18 is fitted over a set of geogrid- holding members 104 on an interconnecting member, the taper and the wide top of the geogrid-holding member 104 restrains the sheet from slipping off. -

Figs. 25 and 26 illustrate an embodiment of the intercon- necting member 110 having geogrid-holding members 104. The structure of the remainder of the interconnecting member 110 is the same as the embodiment illustrated in Figs. 13 - 14.

Figs. 27 and 28 illustrate a further embodiment of the interconnecting member, indicated by reference numeral 112, having

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26-03-2001 CA 000000370 geogrid-hiolding members 104. The structure of the remainder of the interconnecting member 112 is the same as the embediment illustrated in Figs. 15 - 16.

Figs. 29 and 30 illustrate a further embodiment of the interconnecting member, indicated by reference numeral 114, having geogrid-holding members 104. The structure of the remainder of the interconnecting member 114 is the same as the embodiment illustrated in Figs. 17 - 18.

Interconnecting members according to the invention are also used in applications which do not include the use of geogrid, or in which geogrid is used but is not attached to the retaining wall. For such applications, the interconnecting member does not include geogrid-holding members as described above. Figs. 31 - 33 illustrate further embodiments of such interconnecting members. Fig. 31 shows an interconnecting member 116 which is similar in structure to the one illustrated in Figs. 17 - 18, but does not include any geogrid-holding members. Fig. 32 shows an interconnecting member 118 which is ” similar in structure to the one illustrated in Figs. 13 - 14, but does not include any geogrid members. Fig. 33 shows an interconnecting member 120 which is similar in structure to the one illustrated in Figs. 15 - 16, but does not include any geogrid-holding members.

Retaining walls of the invention can optionaily include cover plates which attach to the face of the wall. Referring to Figs. 11 and 12, the cover plate assembiy 30 has a generally rectangular

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26-03-2001 CA 000000370 cover plate 32, which can be made of wood, concrete, plastic or other materials. Plate 32 has opposed edges 34, 36 and 38, 40 and is provided with a bore 42 in each corner adapted to receive an attach- ment rod 44. As shown in Fig. 11(b), attachment rod 44 has a sinu- ous portion 46 and point 48 at one end and is threaded at the other end to engage into nut 50 which has head 52. Attachment rod 44 is affixed to cover plate 32 by inserting it through bore 42 and engaging it with nut 50.

Cover plate assembly 30 has particular application to retaining walls of the invention when made of sand/soil bags, or of hardenable building materials such as bags of cement and aggregate : (rather than to walls made of freshly-formed molded blocks) to improve the durability and appearance of such walls. A cover plate assembly is attached to the wall by pressing the pointed ends of rods 44 through the bags until the inner side of the cover plate 32 abuts the wall. The sinuous portions 46 of the rods 44 enhance the engagement of the rods in the fill material of the sand/soil bags or in the material of the hardenable building units. Additional cover plate assemblies are affixed to the wall, abutting each other, to form a substantially com- plete cover. As shown in Fig. 11, the opposed edges 34, 36 and 38, 40 are alternately concave and convex, so the edges of abutting covers nest together to align the covers and provide some engagement.

Preferably, the covers are positioned so as to a form a staggered, brick : wall-type array, illustrated in Fig. 12.

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Rods 44 can optionally have different means for engage- ment in the fill material of the sand/soil bags or in the hardenable building units instead of sinuous portion 46. For example rods 44 can have threads, ridges or other structures for engagement.

As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. For example, the interconnecting member can be made flexible to conform to the shape of the wall-building units.

The projections on it can be barbed, to enhance: their attachment to the wall-building units, and they can project at angles other than the : vertical from the plate. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.

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Claims (30)

26-03-2001 CA 000000370 «uv. WHAT IS CLAIMED IS:

1. An interconnecting member (26) for attaching a first horizontally-extending course of wall-building units (14) to a second horizontally-extending course of wall-building units posi- tioned vertically adjacent to said first course, said interconnecting member comprising a body (22) with projections (24) capable of protruding into said wall-building units in said first course and in said second course, characterized in that said body is a plate (22) having an upper side and a lower side, each said side havinga plurality of said projections (24) thereon, said plate being capable of extending across at least part of two horizontally-adjacent wall- building units (14) in said first course or in said second course, with said projections (24) on said upper side or said lower side positioned to protrude into said two horizontally-adjacent wall- building units.

2. An interconnecting member (60, 80, 90, 95, 100, 102, 110, 112, 114) according to claim 1, further comprising a set of geogrid-holding members (66, 94, 104) on said upper side of said plate shaped and adapted to protrude through holes (28) in ] a sheet of geogrid (18). :

3. An interconnecting member (60, 80, 90) according to claim 2 further comprising a retaining cap (67) affixed to said geogrid-holding member (66) for retaining a sheet of geogrid (18) thereon.

4. An interconnecting member (110, 112, 114) accord- ing to claim 2 wherein said geogrid holding member is a tapered post (104) having a top (108) wider than its base (109). AMENDED SHEET

26-03-2001 CA 000000370 CRSA J

5. An interconnecting member according to claim 2 further inciuding drainage hoies in the part of said piate between said geogrid-holding members (66, 94, 104) and said projections (64) nearest thereto.

6. An interconnecting member according to claim 1 further comprising a flange (70) around the base of said projec- tions on said upper side of said plate (62) , said flange having a lip (72) for sealing against a wall-building unit (14).

7. An interconnecting member according to claim 6 wherein said lip (72) of said flange has two or more concentric sealing ridges (76).

8. An interconnecting member according to claim 2 wherein said geogrid-holding member (94) is generally L-shaped, having a generally horizontal part (98) extending toward said projections (64).

9. An interconnecting member according to claim 1 wherein said plate (22) is rectangular.

10. An interconnecting member (126) according to claim 1 wherein said plate (122) is generally C-shaped.

11. An interconnecting member (326) according to claim 1 wherein said plate is hemi-cylindrical.

12. An interconnecting member (226) according to claim 1 wherein said plate is trapezoidal with a central cut-out (52). AMENDED SHEET

26-03-2001 CA 000000370

13. An interconnecting member (426) according to claim 1 wherein said piate is generaiiy L-shaped.

14. A retaining wall structure comprising a first plurality of wall-building units (14) positioned adjacent to one another forming a first horizontally-extending course, a second plurality of wall-building units positioned adjacent to one another above said first course forming a second-horizontally-extending course, and interconnecting members (26) between said first course and said second course, said interconnecting members comprising a body (22) with projections (24) capable of protruding into said wall-building units in said first course and in said second course, characterized in that said body is a plate (22) having an upper side and a lower side, each said side having a plurality of projections (24) thereon, said plate extending across at least part of two ED CE — ————horizontally-adjacent-wall-building-units-(14)-in-said first. course or said second course, with said projections (24) on said upper side or said lower side positioned to protrude into said two horizontally-adjacent wall-building units (14).

15. A retaining wall structure according to claim 14 : further comprising a sheet of geogrid (18) extending from be- tween said first and second courses into fill behind said retaining wall structure, said geogrid sheet (18) having a plurality of holes (28) therein, and said geogrid sheet being so positioned that said projections (24) of said first or second set protrude through said holes (28) of said geogrid sheet (18).

16. A retaining wall stricture according to claim 14 wherein said interconnecting member (60, 80, 90, 95, 100, 102, 110, 112, 114) further comprises a set of geogrid-holding mem- bers (66, 94, 104) on the upper side of said plate shaped and AMENDED SHEET

26-03-2001 CA 000000370 adapted to protrude through holes (28) in a sheet of geogrid (18), and wherein said retaining waii structure further comprises a sheet of geogrid (18) extending from between said first and sec- ond courses into fill behind said retaining wall structure, said geogrid sheet having a plurality of holes (28) therein and said geogrid sheet (18) being so positioned that said geogrid-holding members (66, 94, 104) protrude through said holes (28) of said geogrid sheet (18).

17. A retaining wall structure according to claim 16 wherein said second course of wall-building units (14) covers said geogrid-holding members (66, 94, 104).

18. A retaining wall structure according to claim 16 wherein said second course of wall-building units (14) does not cover said geogrid-holding member (66, 94, 104).

19. A retaining wall structure according to claim 14 wherein said wall-building unit (14) is a sand/soil bag.

20. A retaining wall structure according to claim 14 : wherein said wall-building unit (14) is a hardenable building unit. ..

21. A retaining wall structure according to claim 19 wherein said sand/soil bag has a transparent cover and decoratively-colored fill.

22. A retaining wall structure according to claim 19 wherein said sand/scil bag contains ground cover seeds.

23. A method of constructing a retaining wall structure having a plurality of courses of wall-building units (14), compris- AMENDED SHEET

26-03-2001 CA 000000370 Cian ing the steps of placing a first plurality of wall-building units (14) adjacent to one another to form a first horizontally-exiending course, placing interconnecting members (26) on said first course, said interconnecting members comprising a body (22) with projec- tions (24) capable of protruding into said wall-building units (14) in vertically adjacent courses, and placing a second plurality of wall-building units (14) adjacent to one another to form a second horizontally-extending course above said first course such that said projections (24) protrude into said wall-building units (14) of said second course, characterized in that said body is a plate (22) having an upper side and a lower side, each said side having a plurality of projections (24) thereon, said plate (22) extending across at least part of two horizontally-adjacent wall-building units (14) in said first course or in said second course, with said projections (24) on said upper side or said lower side protruding into said two horizontally-adjacent wall-building units.

24. A method according to claim 23 further including the step of placing a sheet of geogrid (18) extending from atop said first course into fill behind said retaining wall structure prior to placing said interconnecting members (26) on said first course, such that said first set of projections (24) protrudes through holes (28) in said geogrid sheet (18) and into said wall-building units (18) of said first course.

25. A method according to claim 23 further including the step of placing a sheet of geogrid (18) on top of said interconnect- ing members (26) extending from atop said first course into fill behind said retaining wall structure prior to placing said second plurality of wall-building units (14) to form said second course, such that said projections (24) protrude through holes (28) in said AMENDED SHEET oo

26-03-2001 CA 000000370 SAAN rN . geogrid sheet (18) and into said wall-building units (14) of said second course.

26. A method according to claim 23 wherein said inter- : connecting member (60, 80, 90, 95, 100, 102, 110, 112, 114) further comprises a set of geogrid-holding members (66, 94, 104) on said upper side of said plate shaped and adapted to protrude through holes (28) in a sheet of geogrid (18), and said method further comprises the step of affixing a sheet of geogrid (18) to said interconnecting member extending into fill behind said retain- ing wall structure.

27. A method of according to claim 23 wherein said wall-building unit (14) is a sand/soil bag. .

28. A method according to claim 23 wherein said wall- building unit (14) is a hardenable building unit.

29. A method according to claim 28 further comprising the step of allowing or causing said hardenable building units (14) to harden.

30. A method according to claim 23 further comprising the step of affixing cover plate assemblies (30) to said retaining wall structure to form a substantially continuous cover for the face of said retaining wall structure. a AMENDED SHEET