Pre-assembly slab system for concrete wind turbine towers and method for assembling a pre-assembly slab system for concrete wind turbine towers

1. A pre-assembly slab system for concrete wind turbine towers, wherein the concrete tower comprises at least two tower sections and wherein each of the sections comprises at least two segments, wherein the system comprises at least a first pre-assembly slab and a second pre-assembly slab, each one of the pre-assembly slabs configured to support and transmit to a ground stresses associated with at least one concrete tower section of the at least two tower sections, wherein the first pre-assembly slab and the second pre-assembly slab are prefabricated, wherein each of the pre-assembly slabs comprises a constant thickness, wherein the thickness is less in the first pre-assembly slab comprising a first contact surface with the ground and a first perimeter than in the second pre-assembly slab comprising a second contact surface with the ground and a second perimeter, wherein the first contact surface and the first perimeter are larger than the second contact surface and the second perimeter, respectively, wherein the first pre-assembly slab is configured to support and transmit to the ground the stresses associated with a first section of the tower closer to a base of the tower than a second section of the tower and the second pre-assembly slab is configured to support and transmit to the ground the stresses associated with the second section of the tower that is further away from the base of the tower than the first section of the tower.

2. The system of claim 1 , wherein the first pre-assembly slab and the second pre-assembly slab are configured to be transported.

3. The system of claim 1 , wherein the first pre-assembly slab and the second pre-assembly slab are made of concrete, comprising a reinforcement.

4. The system of claim 1 , wherein the first pre-assembly slab and the second pre-assembly slab are annular.

5. The system of claim 1 , wherein the first pre-assembly slab and the second pre-assembly slab comprises first fastening elements configured to allow each one of the first pre-assembly slab and the second pre-assembly slab to be hoisted as a whole, the first fastening element configured to hold each of the first pre-assembly slab and the second pre-assembly slab in a horizontal position during hoisting.

6. The system of claim 5 wherein the first fastening elements comprise anchors embedded in the first pre-assembly slab and in the second pre-assembly slab.

7. The system of claim 6 , wherein the first fastening elements comprise lugs that allow the first pre-assembly slab and the second pre-assembly slab or each of the modules of the first pre-assembly slab and the second pre-assembly slab respectively to be hoisted.

8. The system of claim 1 , wherein the first pre-assembly slab and the second pre-assembly slab are modular, comprising at least two modules.

9. The system of claim 8 , wherein the first pre-assembly slab and the second pre-assembly slab comprises joining means between the modules.

10. The system of claim 9 , wherein the joining means between the modules comprise joining profiles and steel sheets, wherein the joining profiles are joined to a steel sheet arranged on a joining flank of each of the modules, and wherein the steel sheets are joined to the modules through inner bars that are embedded in the module once the concrete has set.

11. The system of claim 10 , wherein the joining means between the modules further comprise central joining plates arranged between two joining profiles of adjacent modules, joining plates that are joined by screws.

12. The system of claim 10 wherein the first pre-assembly slab and the second pre-assembly slab comprises second fastening elements configured to allow separate hoisting of each of the modules of the first pre-assembly slab and the second pre-assembly slab, configured to hold each of the modules in a horizontal position during hoisting.

13. The system of claim 1 , wherein it comprises at least two slabs of at least two different dimensions.

14. The system of claim 1 , wherein each of the first pre-assembly slab and the second pre-assembly slab comprises a size and is made up of an amount of material configured to adapt to a geometry and weight of the section of the at least one concrete tower section arranged on each of the first pre-assembly slab and the second pre-assembly slab.

15. The system of claim 1 , further comprising support elements of the sections of the concrete tower configured to be arranged on each of the first pre-assembly slab and the second pre-assembly slab.

16. A pre-assembly slab system for concrete wind turbine towers, wherein the concrete tower comprises at least two concrete tower sections and wherein each of the sections comprises at least two segments, wherein the system comprises at least a first pre-assembly slab and a second pre-assembly slab, each one of the pre-assembly slabs configured to support and transmit to a ground stresses associated with at least one concrete tower section of the at least two concrete tower sections, wherein the first pre-assembly slab and the second pre-assembly slab are prefabricated, modular, each one of them comprising at least two modules and joining means between the modules, wherein the first pre-assembly slab and the second pre-assembly slab are configured to be hoisted to be transported from the ground of a wind turbine tower location to another wind turbine tower location inside a same wind farm with the at least two modules joined together by means of the joining means between modules.