METHOD FOR FORMING A SUPPORT WALL IN THE GROUND AND SUPPORT WALL

Abstract

The invention relates to a method for forming a support wall in the ground from a soil mortar which is made in the ground by mixing soil material and a cement suspension, wherein vertically directed support beams comprising a structural steel are set into the soil mortar in the ground prior to curing, and after curing, soil material is removed along an upper support wall section on at least one side of the support wall, while a lower support wall section continues to be surrounded by soil on both sides. According to the invention, it is provided that a thin-walled sheathing element from concrete is attached to at least one support beam, which extends along an upper support beam section, and that the support beam is set into the soil mortar in such a way that the upper support beam section with the sheathing element from concrete extends along the upper support wall section.

Claims

1. A method for forming a support wall in the ground from a soil mortar which is made in the ground by mixing soil material and a cement suspension, wherein vertically directed support beams comprising a structural steel in that are set soil mortar in the ground prior to curing, and after curing, soil material is removed along an upper support wall section on at least one side of the support wall, while a lower support wall section continues to be surrounded by ground on both sides, wherein a thin-walled sheathing element made of concrete material is attached to at least one support beam, which sheathing element extends along an upper support beam section, and the support beam is set in the soil mortar in such a way that the upper support beam section with the sheathing element made of a concrete material extends along the upper support wall section.

2. The method according to claim 1, wherein the lower support beam section is formed from concrete material without a sheathing element and is arranged within the lower support wall section.

3. The method according to claim 1, wherein the lower support beam section is placed onto a soil bed.

4. The method according claim 1, wherein the sheathing element is formed with a wall thickness of between 1 and 10 cm, preferably between 4 and 8 cm.

5. The method according to claim 1, wherein the sheathing element is of plate-shaped design and is arranged at least on the side of the support beam which is directed towards a free side of the upper support wall section on which soil material is removed.

6. The method according to claim 1, wherein at least two opposing plate-shaped sheathing elements, which extend parallel to one another, are arranged on the support beam.

7. The method according to claim 1, wherein the at least one support beam is configured as a solid steel girder, in particular with an H, T, C or I profile, or as a lattice-like or scaffold-like beam of struts.

8. The method according to claim 1, wherein a cutting trench is formed in the ground by cutting, wherein removed soil material in the cutting trench is processed into the soil mortar by feeding of and mixing with a cement suspension.

9. The method according to claim 1, wherein a borehole is formed in the ground by drilling, wherein the removed soil material in the borehole is processed to the soil mortar by feeding of and mixing with a cement suspension.

10. The method according to claim 9, wherein several boreholes are formed next to one another in the ground by drilling in order to form the support wall.

11. A support wall in the ground made of a soil mortar, in particular formed by a method according to claim 1, wherein the soil mortar in the ground is produced by mixing soil material and a cement suspension and is cured in the ground to the support wall, vertically directed support beams comprising a structural steel are set into the soil mortar in the ground prior to curing, and after curing, by removal of soil material, the support wall is exposed on at least one side along an upper support wall section, while a lower support wall section continues to be surrounded on both sides by ground, wherein a sheathing element made of concrete material is arranged on at least one support beam and extends along an upper support beam section, and the support beam is set into the soil mortar in such a way that the upper support beam section with the sheathing element (30) made of concrete material extends along the upper support wall section.

12. The support wall according to claim 11, wherein a lower support beam section is formed without a sheathing element from concrete material and is arranged within the lower support wall section.

13. The support wall according to claim 11, wherein the sheathing element is formed with a wall thickness of between 1 and 10 cm, preferably between 4 and 8 cm.

14. The support wall according to claim 11, wherein the sheathing element is of plate-shaped design and is arranged at least on the side of the support beam which is directed towards a free side of the upper support wall section on which soil material is removed.

Description

[0032] The invention is described in greater detail below with reference to preferred embodiments, which are shown schematically in the drawings. The drawings show in:

[0033] FIG. 1 a top view of a support wall according to the invention from above;

[0034] FIG. 2 a front view of the support wall of FIG. 1; and

[0035] FIG. 3 a side view of the support wall of FIGS. 1 and 2.

[0036] FIGS. 1 to 3 show, in a highly schematized manner, a part of a support wall 10 according to the invention in various views. The support wall 10 is initially constructed as a whole in the ground 5. The support wall 10 is created in a manner known per se from a soil mortar in the ground 5. Though, a hole is created by cutting or drilling, wherein the removed soil material in this process is preferably mixed in situ with a cement suspension to the soil mortar still within the hole. In the hole created in this way, which in FIGS. 1 to 3 can be a cutting trench with a rectangular cross-section, the soil mortar made in situ can cure to a solid support wall 10. Prior to curing, at least one support beam 20 can be set into the still soft soil mortar.

[0037] Subsequently, an excavation pit can be excavated up to an excavation pit base 9 by removing ground 5. Here, a lower support wall section 14 is still located within the ground 5 below the excavation pit base 9, while an upper support wall section 12 protrudes from the ground 5. The upper support wall section 12 is exposed on at least one side. In the illustrated exemplary embodiment, all sides of the upper support wall section 12 are exposed, as is clearly discernible.

[0038] Therefore, the support wall 10 can be integrated directly into a structure to be built, such as an underground garage wall.

[0039] In order to ensure sufficient resistance of the set support beam 20 against fire and the effects of de-icing salts, for example in accordance with the construction requirements, a sheathing element 30 is attached to the support beam 20 on at least one side, according to the invention. According to the exemplary embodiment shown, a plate-shaped sheathing element 30 can be attached to each of two opposite longitudinal sides of the support beam 20. The at least one sheathing element can preferably extend along the upper support beam section 22 from the excavation base 9 up to the upper end of the support wall 10.

[0040] In the exemplary embodiment shown, the set support beam 20 is made of vertical struts 25 and cross struts 26 made of a structural steel. The vertical struts 25 and the cross struts 26 can preferably be connected to one another by welding. At least one sheathing element 30 is attached to an upper support beam section 22 of the support beam 20 before it is set into the still soft soil mortar. In the illustrated exemplary embodiment, a plate-shaped sheathing element 30 is attached to each of the two long sides of the support beam 20, so that the support beam is supported on both sides in the upper support beam section 22.

[0041] Due to the preferably grid-like structure of the support beam 20 consisting of the vertical struts 25 and the cross struts 26 in combination with the laterally attached thin-walled sheathing elements 30 made of a concrete material, the support beam 20 can be further set with a relatively low resistance into a relatively tough soil mortar, preferably up to a soil bed 7 of the hole, wherein the support beam 20 is very well protected against heat and corrosion influences in its upper support beam section 22 by the at least one thin-walled sheathing element 30.

[0042] The at least one sheathing element 30 is configured and arranged in such a way, that the sheathing element 30 is located in the upper support wall section 12 of the support wall 10. The sheathing element 30 can extend to a certain, limited extent into the area in the ground 5. In contrast, the lower support beam section 24 is kept free of a sheathing element, as no additional protection is required in this area. This is because the lower support beam section 24 is the area of the support beam 20 which is located in the lower support wall section 14, which is still surrounded by ground 5 in its side area.