Ground-reinforcing grid

1. A ground-reinforcing grid, comprising a plurality of modular units, wherein each modular unit comprises:

a plurality of cells,

rib members connecting the cells together such that the cells are spaced apart from each other by the rib members, and

connector means for connecting the modular units together,

wherein the cells are configured to flex more than the rib members;

wherein each modular unit has sufficient rigidity to enable the ground-reinforcing grid to provide ground reinforcement, and

wherein each modular unit has sufficient flexibility provided by the flexing of the plurality of the cells to enable the ground-reinforcing grid to flex and accommodate loads without-adversely affecting the rigidity of the ground-reinforcing grid.

2. The ground-reinforcing grid according to claim 1 , wherein the cells inside the peripheral cells in each modular unit have four rib members.

3. The ground-reinforcing grid according to claim 2 , wherein the four rib members are equidistantly spaced around each cell.

4. The ground-reinforcing grid according to claim 1 , wherein the cells are circular in plan.

5. The ground-reinforcing grid according to claim 1 , wherein the rib members are walls extending transversely of the ground-reinforcing grid.

6. The ground-reinforcing grid according to claim 1 , wherein the cells include open-walled container portions.

7. The ground-reinforcing grid according to claim 6 , wherein the container portions are configured to extend across a portion of a bottom side of the cells to aid water retention in the cells and wherein the container portions have at least one aperture for draining away excess water.

8. The ground-reinforcing grid according to claim 1 , wherein the connector means comprises two part-cells that fit together vertically to make a complete cell.

9. The ground-reinforcing grid according to claim 8 , wherein each part-cell is one half of a complete cell.

10. The ground-reinforcing grid according to claim 9 , wherein at least one part-cell forms a full D-loop to facilitate reduced lateral movement.

11. The ground-reinforcing grid according to claim 8 , wherein the connector means also comprises auxiliary retention means configured to retain the modular units together when they are subjected to vertical loads.

12. The ground-reinforcing grid according to claim 11 , wherein the auxiliary retention means are snap-fit clips that clip adjacent walls of the cells together.

13. The ground-reinforcing grid according to claim 1 , further comprising integral ground-engaging spikes.

14. The ground-reinforcing grid according to claim 13 , wherein the ground-reinforcing grid is 85 mm in thickness, with the cells being 50 mm deep and the spikes being 35 mm long.

15. The ground-reinforcing grid according to claim 1 , wherein each modular unit is 500 mm by 500 mm.

16. The ground-reinforcing grid according to claim 1 , wherein each modular unit comprises six by six rows of full cells and two half-cells in each row of six full cells, the two half-cells forming part of the connector means.

17. The ground-reinforcing grid according to claim 1 , wherein the cells have tops with castellations.

18. The ground-reinforcing grid according to claim 1 , wherein the modular units are configured to overlap each other by at least one cell in any direction.

19. The ground-reinforcing grid according to claim 1 , wherein the ground-reinforcing grid is made of a polyethylene copolymer, a polypropylene copolymer, or mixtures thereof.