A cover device for gratings, having a planar support (1) and a plurality of holding elements (20) which protrude at a bottom side (7) of the support (1), wherein a plurality of elevations (10) and recesses (11) are provided on an upper side (6) of the support (1).

Apparatus and methods related to mats and connects are described. The apparatus include a mat having a top side, a bottom side, and an interior defined between the top side and the bottom side, and at least one connector post extending within the interior of the mat, wherein the at least one connector post comprises a connector pin cavity extending within the interior of the mat and configured to receive a connector pin and at least one locking structure configured to engage with a portion of the connector pin and secure the connector pin to the at least one connector post.

An apparatus for treating water in soil-less growing systems has a container having a cross-sectional area and a height, with a first access port for liquid at an upper end, and a second access port for liquid at a lower end, and a porous matrix filling the container, the matrix comprising a hydrophilic polymer mixed with rocks and natural minerals. Water drawn from a soil-less growing system, is urged into the container through one of the liquid access ports, causes the water to flow through the matrix in the container, the water in contact with the rocks and natural minerals in the matrix, leaching elements from the matrix, and causes the water to exit the container at the other of the liquid access ports, to flow back to the soil-less growing system.

A landscaping block having a block body with at least a first side surface, a second side surface, a third side surface and a fourth side surface, and opposed and substantially parallel top and bottom surfaces. The patio block having at least one spacer projection extending outwardly from each of the at least first, second, third and fourth side surfaces. The patio block having at least one spacer locator positioned along each one of the first, second, third and fourth side surfaces. The at least one spacer locator positioned along each side surface has a retaining surface shaped to receive a spacer projection, at least a portion of the retaining surface extending outwardly from the side surface.

A landscaping block having a block body with at least a first side surface, a second side surface, a third side surface and a fourth side surface, and opposed and substantially parallel top and bottom surfaces. The patio block having at least one spacer projection extending outwardly from each of the at least first, second, third and fourth side surfaces. The patio block having at least one spacer locator positioned along each one of the first, second, third and fourth side surfaces. The at least one spacer locator positioned along each side surface has a retaining surface shaped to receive a spacer projection, at least a portion of the retaining surface extending outwardly from the side surface.

A structure has a high-impact plastic polymer tile comprising interconnected individual cells, each having an outer wall of a vertical dimension forming a closed outer periphery, and a matrix filling the cells from a lowermost extremity of the walls of the cells, to level below an uppermost extremity of the internal walls of the cells, the matrix comprising material supporting plant growth. With the tile lying on a base surface, the individual cells of the tile constrain the matrix material from horizontal translation, and wherein the walls of the cells, extending above the level of the matrix in the cells, provide support for any wheeled vehicle without disturbing the matrix.

A structure has a high-impact plastic polymer tile comprising interconnected individual cells, each having an outer wall of a vertical dimension forming a closed outer periphery, and a matrix filling the cells from a lowermost extremity of the walls of the cells, to level below an uppermost extremity of the internal walls of the cells, the matrix comprising material supporting plant growth. With the tile lying on a base surface, the individual cells of the tile constrain the matrix material from horizontal translation, and wherein the walls of the cells, extending above the level of the matrix in the cells, provide support for any wheeled vehicle without disturbing the matrix.

A linkage brick assembly, comprising: a least one first linkage brick, at least one second linkage brick and at least one third linkage brick, each linkage brick comprising a top face, a bottom face and four side faces between the top face and the bottom face. Each of the side faces of the first linkage brick forms a traverse engaging groove extending laterally. Each of two opposite side faces of the four side faces of the second linkage brick forms a traverse engaging protrusion extending laterally and each of the other two opposite side faces forms a vertical engaging portion extending vertically. Each of the side faces of the third linkage brick forms a vertical engaging groove extending vertically. Each of the traverse engaging grooves of the first linkage brick is used to engage with each of the traverse engaging protrusions of the second linkage brick through lateral sliding. Each of the vertical engaging grooves of the third linkage brick is used to engage with each of the vertical engaging protrusions of the second linkage brick through downward sliding. Due to the above structures, fast assembly of the linkage brick assembly of a large area can be achieved by means of the interlocking of only three types of linkage bricks.

An access mat comprises a single unitary body having a generally planar upper wall, a bottom wall and side walls joining side edges of the upper wall and the bottom wall, formed by pultrusion from composite material comprising longitudinally continuous fibers and a set resin so as to define an elongated tubular body enclosing a hollow interior. The unitary body includes integrally formed parallel reinforcing ribs bridging the hollow interior in a thickness direction. The bottom wall has recessed channels therein receiving pultruded elongate connector members each shaped to fit into a respective one of the recessed channels with a bottom surface of the connector member coplanar with the bottom surface and a top surface of the connector member in engagement with a raised surface of the respective recessed channel for connecting of an end of the body to an adjacent end of another body by bridging between the bodies.

An access mat comprises a single unitary body having a generally planar upper wall, a bottom wall and side walls joining side edges of the upper wall and the bottom wall, formed by pultrusion from composite material comprising longitudinally continuous fibers and a set resin so as to define an elongated tubular body enclosing a hollow interior. The unitary body includes integrally formed parallel reinforcing ribs bridging the hollow interior in a thickness direction. The bottom wall has recessed channels therein receiving pultruded elongate connector members each shaped to fit into a respective one of the recessed channels with a bottom surface of the connector member coplanar with the bottom surface and a top surface of the connector member in engagement with a raised surface of the respective recessed channel for connecting of an end of the body to an adjacent end of another body by bridging between the bodies.