JPS6339760B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a self-propelled ram drilling device, in particular for land drilling, having a percussion tip acted upon by a reciprocating percussion piston in the case of the device and a guide surface for controlling the direction of travel. This is related to.

A ram drilling device of this kind is described, for example, in German publication 2242605, and has at its rear end a tubularly bent extension, which is likewise provided with a curved guide surface and thus An arcuate progression of drilling takes place. The purpose of this extension is to propel not only linear but also arcuate devices into the ground. It is necessary to make such arcuate progressing ground drillings in streets with narrow sidewalks, since the ram drilling device can be placed horizontally in the starting hole and, furthermore, everything is above the road surface. This is the case when it is not possible to dig the starting and ending holes, which must be at least deep enough to widen the underlying conduit. Experience has shown that known self-propelled ram drilling machines with curved tubular extensions and curved guide surfaces are suitable for soft soils, especially in the immediate surroundings of the soil drilling. This is because it is strongly compressed by the work of the land ram drilling device and the subsequent guide mechanism pushed into it is therefore strongly constrained.

The additional appearance of the restraining effect is that the case of the ram perforator must be straight for the reciprocating movement of the percussion piston, and only the tubular extension can be bent, so that the case of the ram perforator This is because they are often caught in ground drillings that are automatically made due to the change in direction caused by the guide mechanism.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a self-propelled ram drilling device that produces linear and arcuate progressing land drillings of varying radii at approximately the same propulsion horsepower.

The purpose of this is to generate operating impulses at the striking tip, thus ensuring that no propulsion power is lost due to the necessary guide surfaces and favoring a controlled movement of the ram drilling device through the land; The resulting drilling of the ground is achieved in such a way that the case of the ram drilling device cannot be pinched therein.

The above object is achieved in that in a ram drilling device of the type called for at the outset, the striking tip has a front bevel which, according to the invention, acts as a guide surface. This slope imparts a component of motion to the ram drilling device in the ground in a direction perpendicular to its axis, which component directs the arcuate progression of the ground drilling produced by the ram drilling device. According to the inclination angle of the slope, the radius of the arcuate land drilling will be of different size, so that different radii are obtained for the interchangeable striking tip by different slopes with different inclination angles. In some cases, the slope can also be roof-shaped in order to increase the propulsion power.

In fact, only by the deflection of the striking tip limited by the slope, drilling in the ground with an oval cross section is already produced, since the friction of the device case during the drilling is minimal during the curve progression. It leads to However, it is also possible that the case of the ram drilling device is completely clamped if the striking tip has an oval cross-section at least within the range of the bevel and the bevel extends in the direction of the long axis of the oval cross-section. It is to move through an arc-shaped land hole without any action. The ram drilling device is therefore not distorted during operation;
This results in a screw-progressing ground perforation, which makes it possible to place an axial guide mechanism at the striking tip,
This preferably consists of at least one guide vane arranged perpendicularly to the mantle line of the striking tip.

Another possibility of reaching an oval cross-section of the land drilling consists in arranging, in front of the slope of the striking tip, an operating plate of oval shape and protruding beyond the slope on one side. In this case, the guide vane extends in the axial direction from the protrusion of the operating plate to the rear end of the striking tip. It is advantageous here for the guide vane to be radially higher than the projection and for diametrically opposite to this guide vane a second relatively lower guide vane to be arranged.

The invention will be explained in detail below with reference to an embodiment shown in the drawing.

Since the ram drilling device used for making arcuate progressing land drillings is described in the already mentioned German publication 2242605, only its tubular case 1 will be described. A compressed air hose 2 is arranged at the rear end of the tubular case 1, with the aid of which compressed air acts on a percussion piston that reciprocates within the case. The percussion piston acts on a mounting cone 3 on which a percussion tip 5 is mounted and fixed by a pin inserted through a transverse bore 4 . The percussion tip 5 consists of a solid percussion object 6, which has a hole in its rear region that accommodates the mounting cone 3. A transverse hole 7 located simply in the striking object 6 in the area of the front end of the mounting cone 3
serves to release the striking tip 5 with the aid of a conical expeller. In this way, different striking tips can be easily inserted with different angles of inclination α.

There is one slope 8 at the front end of the striking object 6,
On the other hand, an elliptical operation plate 9 having a protrusion on one side is arranged. Perpendicular to the casing line of the striking object 6 there is an upper guide mechanism vane 10 which is also connected to the operating plate 9 and is higher than the projection of the operating plate 9 in the radial direction.

A lower guide mechanism (vane) 11 is arranged diametrically opposite the upper guide mechanism (vane) 10 and has a relatively low radial height. Due to the projection of the control panel 9 and also due to the oval configuration of the striking object 6 in the area of the lower guide mechanism (vane) 11, an oval and arcuate progressing ground perforation is created, through which it is possible to penetrate into the case. Due to the axially movably guided striking tip, the case 1 can be moved without tightening.

The embodiment according to FIGS. 3 to 5 is illustrated here and differs from FIGS. 1 and 2 in that the striking tip 12, also movably mounted, is provided with a striking object 13 without an operating plate. This is different from the embodiment. The front side of the striking object 13 is formed as a roof-like slope 14, and within the area of the slope 14 the striking object 13 is designed in the form of a thick oval, so that an oval-shaped perforation is produced. In order to prevent the ram drilling device from being twisted during operation, the device is also equipped with an upper guide mechanism (vanes) 15 and a lower guide mechanism (vanes) 16.

What is clear from FIG. 6 is that although the sidewalk 17 leading along the row of houses 21 is very narrow, there is no need to dig a starting hole and an end hole, and the land drilling progresses in an arc shape between two rows of houses 21. is to be created. With the aid of the angle α of the slope at the striking tip of the ram perforator, the desired radius can be adjusted, thus creating an arch in the lower part of the drainage pipe 20 extending below the street 18 and further below. A land borehole 19 that progresses in shape will extend.
It is also clear from this figure that the large diameter of the oval land drilling is of sufficient dimension to avoid pinching of the straight case of the ram drilling device.

[Brief explanation of drawings]

FIG. 1 is a sectional side view of a ram drilling device with a striking tip according to the invention. 2 is a front view of the striking tip of the device according to FIG. 1; FIG. Third
The figure is a side view of another striking tip shown in section.
FIG. 4 is a front view of the striking tip according to FIG. 3;
FIG. 5 is a sectional view taken along the line --- in FIG. 3, across the striking tip. FIG. 6 schematically shows the use of a ram drilling device according to the invention to create an arcuate progressing land drilling below a street. In the figure, 1... Tubular case, 2... Compressed air hose, 3... Mounting cone, 4, 7... Cross hole, 5, 12... Hitting tip, 6, 13... Hitting object, 8 , 14...Slope, 10, 11, 15, 16
...Guidance device, 9...Operation board, 17...Sidewalk,
18...Street, 19...Land perforation, 20...Drainage pipe, 21...House row, α...Slope angle.

Claims (1)

[Scope of Claims] 1. In a self-propelled ram drilling machine, in particular for land drilling, having a striking tip acted upon by a striking piston reciprocating in the case of the machine and a guide face for controlling the direction of travel. is the front surface of the striking tip 5, 12 that intersects at an angle with the long axis of the tubular case 1 constituting the drilling device, and is characterized by comprising at least one slope 8, 14 asymmetrical with respect to the long axis. drilling device. 2. The ram drilling device according to claim 1, wherein the striking tips 5, 12 are replaceable with ones that form various inclination angles α with the long axis of the tubular case 1. 3. The ram drilling device according to claim 1 or 2, wherein the slope 14 is formed in a roof shape. 4 The striking tips 5, 12 are at least on the slopes 8, 14
Claims 1, 2, and 3 are characterized in that the cross section is elliptical within the range of , and the slopes 8 and 14 extend in the long axis direction of the elliptical cross section. The ram perforation device according to any one of the above. 5 Guide mechanism 1 in the direction of the long axis of the striking tips 5, 12
The ram drilling device according to any one of claims 1 to 4, characterized in that 0, 11, 15, and 16 are arranged. 6. The ram drilling device according to claim 5, wherein the guide mechanism 10, 11, 15, 16 comprises at least one guide vane arranged perpendicularly to the mantle line of the striking tips 5, 12. . 7 In front of the slope 8 of the striking tip 5, an elliptical operation plate 9 with one side protruding beyond the slope 8 is disposed, and the guide blade extends in the axial direction from the protrusion of the operation plate 9 to the striking tip 5. 7. The ram drilling device according to claim 6, wherein the ram drilling device extends to the rear end of the ram drilling device. 8 The blades forming the guide mechanism 10 are higher than the protrusion of the operation plate 9 in the radial direction, and the blades forming the second relatively low guide mechanism 11 are arranged on the diametrically opposite side of the guide blades. The ram drilling device according to claim 7, characterized in that: