Abstract: A block for use in constructing a retaining wall system has a front wall and a partition wall formed backwards projecting from the front wall; wherein the partition wall is provided with a communicating hole extending vertically over the entire length thereof through and in which a reinforcing iron rod is disposed or inserted; the partition wall is provided on an upper surface with an upper depression such that the upper depression is enclosed with an upwardly raised peripheral edge portion having a top flat surface and an inner wall surface of the peripheral raised edge portion is gradually widened downwardly from the top surface edge toward the inside of the upper depression; the partition is further provided on a bottom surface with a lower depression such that the lower depression is enclosed with a downwardly reduced peripheral edge portion and an inner wall surface of the peripheral reduced edge portion is gradually narrowed downwardly from the bottom surface of the lower depression toward the bottom ed

Abstract: A block for retaining wall of a leaning type includes a front wall disposed with an upper portion thereof located behind a lower portion thereof so as to lean gradually in a backward direction, a partition wall having a length as substantially long as a vertical length of a rear wall portion of the front wall and extending backward, and a bottom plate connected integrally to a bottom portion of the front wall and extending backward. At least either of the front wall or said partition wall is provided with an opening which extends vertically over an entire length of said partition wall and into which an iron bar or rod is disposed.

Abstract: A block for constructing a retaining wall comprises a front wall and a counterfort protruded from a back side of the front wall, wherein the counterfort is provided with a plurality of reinforcing steel bar insertion holes each of which has upper and lower ends thereof open-ended. Each reinforcing steel bar insertion hole disposed in a front wall side away from a neutral force plane is either a tapered hole increasing in diameter thereof from the upper opening to the lower opening thereof. Each reinforcing steel bar insertion hole disposed in a rear end side away from the neutral force plane is an inverse-tapered hole having a diameter increasing from the lower opening to the upper opening.