EXCAVATION AND COMPACTION EQUIPMENT FOR THE CONSTRUCTION OF SCREW PILES

• US 20100263928A1
• Filed: 04/19/2010
• Published: 10/21/2010
• Est. Priority Date: 04/20/2009
• Status: Active Grant

• Current Assignee: Soilmec SpA (Trevi-Finanziaria Industriale SPA)
• Original Assignee: Soilmec SpA (Trevi-Finanziaria Industriale SPA)
• Inventors: Massari, Stefano
• Granted Patent: US 8,443,918 B2
• Time in Patent Office: Days
• US Class Current: 175/19
• CPC Class Codes: E02D 5/36 making without use of mouldpipes or other moulds
• CPC Class Codes: E02D 7/22 Placing by screwing down screw piles per se E02D5/56

Abstract

Excavation equipment for the construction of compaction piles includes a tool mounted at the end of a drilling rod; the tool is constituted by a shaft (10) provided on its end with digging teeth (12) and with at least a plate (14) for collecting debris rotating between an open position during the excavation and closed during the ascent of the tool. A screw (17, 18, 17′, 18′, 20); is of the type having at least two principles (17, 18, 20), in the upper part (20) fixed directly on the shaft (10) and in the lower part (17, 18) fixed on a cylindrical element (16) inserted on the shaft. A compactor (19) is positioned on the screw (17, 18) of the cylindrical element (16). The shaft rotates between two positions displaced between them, one corresponding to the excavation condition and the other to the ascent one; each of the at least two-principle screws of the shaft (20) constitutes the continuation of a corresponding screw (17, 18) of the cylindrical body (16) depending on the angular position of the shaft (10).

Claims

1. Excavation equipment for the construction of compaction piles comprising a tool mounted at the end of a drilling rod;

the tool comprising a shaft provided on its end with digging teeth and with at least a plate for collecting debris rotating between an open position during excavation and closed position during the ascent of the tool;

screw means developing around the shaft and inward radially developed means for compacting the ground being dislocated along said screw means wherein the screw comprises at least two principles, in an upper part fixed directly on the shaft and in a lower part fixed on a cylindrical element inserted on the shaft;

the means for compacting being positioned on the screw means of the cylindrical element;

the shaft rotating between two positions displaced between them, one position corresponding to the excavation and the other to the ascent;

each of the at least two-principle screws of the shaft comprising the continuation of a corresponding screw of the cylindrical body depending on the angular position of the shaft.

2. Excavation equipment according to claim 1 wherein the shaft rotates between two positions, wherein the two positions are displaced at an angle equivalent to 180°

.

3. Excavation equipment according to claim 1 wherein the shaft rotates between two positions, wherein the two positions are displaced between at an angle lower than 180°

.

4. Excavation equipment according to claim 1 wherein the shaft rotates between two positions, wherein the two positions are displaced at an angle greater than 180°

.

5. Equipment according to claim 1 wherein the means for compacting have a maximum diameter that has an axial extension greater than half of the value of the compaction diameter.

6. Equipment according to claim 1 wherein the means for compacting have a maximum diameter that has an axial extension comprising between one and two times the maximum compaction diameter.

7. Equipment according to claim 1 wherein the plate can be removed with respect to the shaft.

8. Equipment according to claim 1 wherein the screws are three-principle screws.

9. Equipment according to claim 1 wherein the screws are four-principle screws.

10. Equipment according to claim 1 further comprising a mechanical stop that works in contrast with elastic means to block the angular position between the parts in relative rotation, once the closing rotation has been completed and the plate, being in closed position, completely divides a casting area from a compaction area.