DE571563C - Earth auger for making horizontal or inclined holes - Google Patents

Description

The invention has the purpose of creating horizontal or inclined holes in the ground to produce to longer lengths.

Occasionally the task is to make round iron anchors for quay walls, sheet piling and to lay similar systems in the ground, with the surface otherwise, z. B ". Through fixed Buildings, tracks, etc., is in use and, as a result, digging up difficulties or digging would be uneconomical due to great depth were. In the case of shorter bores, the introduction has already been carried out in such a way that a drill pipe by means of the known Auger was driven horizontally or inclined through the natural soil and the anchor tie rods were pulled through this drill pipe after the soil was off this had been removed. With larger ones

Lengths of the boreholes (20 m and more) should "but be difficult with the known Drilling jigs the drill pipe in the desired direction and without substantial Deviation from the straight line

a5, but there are considerable deviations here from the planned direction, so that the proper insertion of the anchor tie rods is very difficult.

The present invention now aims

to lay such anchors in an impeccable manner.

In the drawing, an embodiment of the invention is shown; show it:
Fig. Ι the earth auger connected to the casing pipe section, partly in section,

Fig. 2 an earth auger for hard soil types.

The drilling device (Fig. 1) is placed on the outside of the wall or sheet pile wall from a special shaft or an embankment. scheduled. A screw-like earth auger b is located behind the tip on a sturdy shaft α. For soft types of soil, this is provided with screw blades with a large diameter (Fig. 1), which cause only little resistance when screwing into the soil. In the case of hard soil types, on the other hand, several screw threads of the same diameter and small, which are arranged one behind the other at larger intervals, are selected (Fig. 2), so that on the one hand the resistance of the soil when screwing in is not excessive, but on the other hand sufficient Tensile transmission to the ground is guaranteed by each leaf, the distance between the individual courses is to be dimensioned so that the pressing of the ground by the previous course has become ineffective, which is the case after very short distances due to the radial pressure distribution in the ground. At a greater distance behind the earth auger δ, a disk drill c is arranged on the other shaft α. The length of the shank between earth auger and disc drill is again dimensioned so large that the pressure of the soil behind the earth auger is not transferred to the disc auger. As a result, the drill pipe is only subjected to tensile stress and the disk drill can work easily. The last course of the

57156a

The plate drill has the same diameter as the adjoining drill pipe mouthpiece d: on the same shank, behind the disc drill, with the interposition of a disc gear e of a smaller diameter, a screw conveyor / is arranged in a hollow cylinder g , which has rings on its outer surface that fit into corresponding grooves in the reinforced drill pipe head piece like a comb bearing ίο intervene and have the purpose of transmitting the tension transmitted by the earth auger to the shaft on to the drill pipe and retightening it. Behind the screw conveyor, the shaft is designed as a tube h and provided with outlet nozzles i for introducing press water so that the cuttings conveyed into the drill tube can be flushed out to the rear. This arrangement, in which only the shaft piece, which is pushed by means of a socket, executes rotary movements, it is achieved that the drill pipe is retightened while avoiding compressive stress. After the first drill pipe section has penetrated into the ground in the working direction, its direction is permanently fixed when the shaft is turned and the bobr pipe penetrates, which is pushed in individual pieces. As a result, the earth auger cannot move sideways if there is minor resistance in the ground. Rather, the safely guided earth auger will clear any obstacles aside by means of its screw blades.

Due to the comb-like connection of the cylinder jacket with the screw conveyor the drill pipe mouthpiece ensures that the drill pipe can be retightened.

Since the largest plate courses of the plate

♦ o drill the same diameter as that

Drill pipe, the earth is removed only to the extent of the casing, so that on the one hand the drill pipe can follow without great resistance, on the other hand the surrounding soil itself is not relaxed. The screw conveyor, which has a smaller diameter than the circular drill has a correspondingly greater screw pitch, so that the cuttings produced by the circular drill is easily promoted.

With the at the end of the shaft and flushing device known per se is the cuttings, the progress of the bore following, continuously, eliminated so that the Drill pipe by the weight of the drill material not burdened, is.

If this is not possible, due to the presence of structures on the surface The earth auger can be used to create excavation pits for inserting the anchors train particularly vigorously and after drilling in the anchor rods! left in the ground. He then takes over the task of the anchor.

Claims (2)

Patent claims: i. Earth drills for producing horizontal or inclined bores, in particular for anchors of quay walls, sheet pile walls and similar systems, characterized in that on one and. the same drill shank (α) directly in front of a closed screw conveyor (f) guided in a casing tube like a comb bearing, a disc drill (c) and at a greater distance therefrom an earth auger (b) are arranged. In that the diameter of the adjoining the casing tube plate gear is 2. auger according to claim 1, characterized in that equal to the outer diameter of the cladding tube and that the dish drill protrudes with an adapted in diameter to the transition of the screw conveyor plate passage (s) into the jacket pipe. 1 sheet of drawings