The alignment holes are generally centered on points 1/4 and 3/4 of the distance along the length of the face block 24. The alignment pin resides in the front portion of the alignment channel 58 if zero setback is desired, and within the rear pocket 60 to achieve a stepped setback. An alignment pin (not shown) may be inserted in the channel 58 in the forward oblong portion or in the rear pocket 60 to upwardly protrude and engage the alignment channels 58 of a face block 24 in the overlaying layer of blocks. Each alignment channel includes a rear pocket 60 in parallel communication with the alignment channel 58 and extending to a limited depth. The face block 24 further includes alignment channels 58 defining oblong bores passing vertically through the entire block. In addition, because different face textures are required for different applications, a variety of entirely different blocks must be fabricated and stocked. Also, where a single thickness of blocks must retain the earth, each block must be of appreciable size and weight, making handling for installation difficult. Because excavation is costly, and the tie-back sheet must extend rearward at least 2/3 of the wall height, this type of wall often is not cost effective. For taller walls, a horizontal tie-back sheet must be located between lower layers of blocks, anchored to pins in the blocks, and extended rearwardly into an excavated area to be backfilled for retaining the lower portions of the wall against the outward force of the earth being retained. 4,914,876 to Forsberg, which shows each block having a decorative exterior face so that the wall presents an attractive appearance. An example of such a system is shown in U.S. Typically, blocks are placed in rows overlaying on top of each other to form a wall. Retaining walls are made of various materials such as concrete, solid masonry, wood ties, bricks and blocks of stone and concrete. E02D29/025- Retaining or protecting walls made up of similar modular elements stacked without mortarĬonventional retaining walls are used to secure earth embankments against sliding and slumping.E02D29/0266- Retaining or protecting walls characterised by constructional features made up of preformed elements.E02D29/0258- Retaining or protecting walls characterised by constructional features.E02D29/02- Retaining or protecting walls.E02D29/00- Independent underground or underwater structures Retaining walls.E02D- FOUNDATIONS EXCAVATIONS EMBANKMENTS UNDERGROUND OR UNDERWATER STRUCTURES.E02- HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING.Application granted granted Critical Publication of US5350256A publication Critical patent/US5350256A/en Priority to US08/590,372 priority patent/US5688078A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAMMER, JAMES Priority to CA002082666A priority patent/CA2082666C/en Priority to AU29645/92A priority patent/AU2964592A/en Assigned to WESTBLOCK SYSTEMS, INC. OF OR reassignment WESTBLOCK PRODUCTS, INC., A CORP. 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 Westblock Products Inc filed Critical Westblock Products Inc Priority to US07/798,120 priority Critical patent/US5350256A/en Assigned to WESTBLOCK PRODUCTS, INC., A CORP. Original Assignee Westblock Products Inc 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 or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US07/798,120 Inventor James Hammer Current Assignee (The listed assignees may be inaccurate. Google Patents Interlocking retaining walls blocks and systemÄownload PDF Info Publication number US5350256A US5350256A US07/798,120 US79812091A US5350256A US 5350256 A US5350256 A US 5350256A US 79812091 A US79812091 A US 79812091A US 5350256 A US5350256 A US 5350256A Authority US United States Prior art keywords block face trunk tail blocks Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US5350256A - Interlocking retaining walls blocks and system US5350256A - Interlocking retaining walls blocks and system
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