Retaining wall block and system
A retaining wall block for an engineered block retaining wall system having an integrally formed head, neck and body, in which one generally planar front face of the body forms a visible part of the wall, the body having two pin holes, two clean out holes, and two pin receiving openings, the pin receiving openings being configured to receive a free end of a lock pin provided in a pin hole of a block placed there under so as to interlock the blocks with a predetermined setback. The pin holes and pin receiving openings being positioned such that a plane extending perpendicular to the generally planar front face passes through one, and only one, of said pin holes or said pin receiving openings.
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This relates to the field of retaining walls and the blocks used to construct retaining walls.
BACKGROUNDRetaining walls have been traditionally constructed using natural stone, landscape timbers, masonry block, poured concrete or railroad ties. More recently, engineered concrete block retaining systems have been introduced to the market. Those systems, exemplified by U.S. Pat. No. 7,011,474 to MacDonald, do not use mortar to lock the individual blocks into position but rely instead on methods of locking blocks into position, including specially formed pins. These lock pins include a relatively small diameter body portion that fits into holes formed in the blocks that form a lower course of a retaining wall and a relatively large diameter head portion that sits on top of the block. The next course of block is laid such that the larger diameter head of the lock pin fits into grooves formed in the bottom of the blocks that form the next course of block. Thus, the lock pin secures the two courses together. Other engineered concrete block retaining systems are shown in U.S. Pat. Nos. Re. 34,314, and 4,914,876 (both to Forsberg); 5,294,216 (to Sievert); and 7,168,892 (to MacDonald).
These products have become popular because they are easy to install, very durable, and can be used to create structurally sound retaining walls at great cost savings. We now describe a retaining wall block that eliminates the need for locking pins having a large diameter head and small diameter body and reduces the weight of the engineered retaining wall block while maintaining the structural integrity of the block and the retaining walls formed of such blocks.
Referring to
The neck 3 and head 4 are formed to reduce the weight of block 1, while maintaining structural integrity and support. Body 2 forms the greatest part of block 1, with a width of approximately one and ½ feet and a depth of just over 4 inches. Neck 3 is long and narrow by comparison. Neck 3 is narrowed about 4 inches on each side of body 2 so as to remain centered on body 2 and to create shoulder portions 8 and 9 on each side of body 2. The cross-section of neck 3 is thus reduced to approximately half the cross-section of body 2. Neck 3 extends approximately five and ¾ inches in depth. The weight of neck 3 is further reduced by forming a rectangular-shaped opening 10 that extends through the neck 3 from the top surface 5 to the bottom surface 6 of block 1. Opening 10 is molded to be approximately 5 inches wide and 6 inches deep, and centered within neck 3. The forward-most wall 11 of opening 10 is approximately co-planar with shoulders 8 and 9.
First and second receiving openings 12 and 13 are formed in the body 2 and extend from the top surface 5 to the bottom surface 6. In the preferred embodiment, each of these openings is approximately one and ⅛ inches thick and 2¾ inches wide. The receiving openings 12 and 13 are wide and long enough to ease installation and to account for variations encountered on-site when laying a wall. The extension of receiving openings 12 and 13 through block 1 from the top surface 5 to the bottom surface 6 saves material costs and effectively reduces block weight so as to further ease placement and installation.
First and second pin holes 14 and 15 are formed in the body 2. These pin holes are approximately 9/16 inches in diameter and extend approximately 2½ inches into body 2. These pin holes are designed to accept insertion of pins which are used to interlock block 1 in position with one or more blocks placed above. Pin holes 14 and 15 are also formed to include clean out holes 31 and 32, respectively, which are of smaller diameter than the pin holes 14 and 15. In one embodiment, the clean out holes 31 and 32, shown in
The pins 16 and 17 are preferably constructed of fiberglass dowel of less than 9/16 thickness and 5 inch height. Those of skill in the art understand that other sizes and constructions would also be suitable, for example rebar steel or other suitable materials can be substituted for fiberglass. The pin holes 14 and 15 are placed relative to the placement of the receiving openings 12 and 13 so the block 1, when installed, functions together with its neighbors to provide a structurally sound, engineered retaining wall system.
In the preferred embodiment, the rearmost inner walls 18 and 19 of openings 12 and 13, respectfully, are spaced 1¼ inches forwardly of the forward most wall 11 of opening 10. By contrast, the pin holes 14 and 15 are positioned 1 inch forward of that same wall. Through this relative placement, each block 1 is secured in place on top of the blocks that form the lower course, leaving a ¼ of an inch setback for each successive course of blocks. The setback can be strategically greater or less depending on the appearance of the wall desired. This setback is shown in
The assembly of blocks to form a retaining wall is best described with reference to
During installation, ear portions 22 and 23 can be reduces in size or knocked off entirely to facilitate placement of a row of blocks 1 in a concave shaped retaining wall as shown in
Irrespective of the size or shape of the wall constructed by serial placement of block 1, the depth and resultant stability of the wall is increased by including both neck 3 and head 4. In application, opening 10, and the spacing between legs 18 and 19 of adjacent block in the same row can be filled with gravel to further anchor the wall to the hillside while facilitating the drainage of water therethrough without harm to the integrity of the resulting retaining wall structure.
Various aspects of the different embodiments can be combined in different combinations to create new embodiments. While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims
1. A retaining wall block having a top surface and a bottom surface and a generally planar front face designed to form a portion of a front wall of a modular retaining wall system comprising:
- a body portion having said generally planar front face;
- a neck portion;
- a head portion;
- said body, neck and head portions being integrally formed and each having a defined width, said width of said body portion being greater than said width of said head portion, and said width of said head portion being greater than said width of said neck portion, said neck portion formed to have an opening extending from said top surface to said bottom surface, said opening dividing said neck portion to define two legs which connect said head portion to said body portion;
- first and second openings in said body portion extending between said top and said bottom surfaces defining first and second lock pin receiving openings; and
- first and second pin holes in said body portion and opening on said top surface, said pin holes being designed to accept a lock pin, said pin hole terminating within said body; and
- first and second clean out holes provided in the body portion below the first and second pin holes, said clean out holes being designed to avoid blockage of said pin holes by accumulation of debris said first and second clean out holes terminating within said body;
- wherein said first and second openings in said body portion are each configured to receive a free end of a lock pin provided in a pin hole of a block placed thereunder so as to interlock the blocks with a predetermined setback, and wherein a plane extending perpendicular to said generally planar front face passes through one of said pin holes or said pin receiving openings.
2. The retaining wall block of claim 1 in which said body, neck and head are formed of poured concrete.
3. The retaining wall block of claim 1 in which said opening in said neck forms two legs which connect said head to said body portion, wherein said pin holes and said pin receiving openings are configured such when said block is interlocked with one or more blocks thereunder, said legs of said block do not align with a leg of said block thereunder.
4. The retaining block of claim 1 wherein said body further includes side walls which taper from said generally planar front face and said head include first and second ears which can be removed to facilitate formation of a convex shaped wall.
Type: Application
Filed: Oct 3, 2007
Publication Date: Apr 9, 2009
Applicant: SCI Materials (Ocala, FL)
Inventors: Harold Rodebaugh (Ocala, FL), Steven C. Counts (Ocala, FL)
Application Number: 11/905,680
International Classification: E02D 29/02 (20060101);