JPH072784Y2 - Head for correcting lead tube direction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is desirable when a lead pipe for guiding a pipe to be piped is pre-blinded when propelling the pipe underground. The present invention relates to a head portion for propelling while correcting the direction.

(Prior Art) In the conventional lead tube propulsion head, the target plate is fixed to the inside of the rear end portion of the head portion whose cross-sectional shape is obliquely cut in a model.

(Problems to be solved by the invention) However, in the head part in which the cross-sectional shape is cut obliquely into a wedge shape,
During normal propulsion while rotating, the resistance force of the earth and sand acting on the head part concentrates on the rotation direction side end part of the wedge-shaped tip, so only that part is made a hard material, the other part is compressed, It is desirable to use a soft material in order to cope with each stress such as twisting and bending, but it is not possible to make only the end portion hard due to its complicated shape, and
It is also difficult to cure only the end portion by heat treatment or the like, and therefore, damage to the portion forces the replacement of the head portion. Therefore, there has been a strong demand for a method capable of curing only the portion by some method.

Furthermore, if the target plate is fixed inside the vicinity of the rear end of the head part, the angle of oblique cutting at the tip of the head part depends on the soil soil to be propelled in order to make a blind run while correcting the direction of the ground. Despite changing the shape or changing the shape itself, only the tip of the head cannot be replaced. Therefore, the entire head including the target plate must be replaced. When using in a soil that is difficult to use, even if you do not plan to use it later, you must prepare the head part including the target part only for that purpose. However, even if the tip of the head part is easily worn and the target plate can be used continuously, the entire head part must be replaced. If the target plate has failed,
Since the target plate was fixed to the head part, it could not be repaired, which was very uneconomical.

In consideration of the above points, the present invention can cure the end portion of the direction correcting head in the rotational direction, and further, by separating the head portion into the direction correcting head and the target portion, the direction correcting head is corrected. It is an object of the present invention to provide an economical and efficient propulsion head by allowing only the head to be changed and adapted to the desired soil quality, and at the same time allowing repair and replacement of the target portion.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides a propulsion blade having a shape in which only the tip end portion of a cylindrical tube is vertically cut out by about 2/3 to 4/5. The notch of the propulsion blade is projected forward from the tip of the head main body, and is fixed in a state where the tip of the head main body is inserted in the cylindrical base of the propulsion blade. A rib is provided along the line from the tip of the head body to the inner surface of the propulsion blade, and a screw for connecting the target body to the rear end of the head body is engraved.

(Operation) With the above-described configuration, the shape of the propulsion blade is a state in which the tip of the cylindrical tube is cut out in the vertical direction. That is,
Since the resistance force of the earth and sand acts only on the rotation direction side end portion of the portion protruding forward from the tip of the head main body, and since the shape of the portion is simple, it is extremely difficult to apply heat treatment or the like. It is ready and the part can be cured.

In addition, by engraving a screw on the rear end of the head part main body so that the target part main body can be connected, the head part main body and the target part main body can be connected and separated freely, and only the head part main body can be selected depending on the soil quality. It is extremely economical because it can be replaced and the inside of the target body can be easily repaired and replaced.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIGS. 1 and 2, a notch (2) of a propulsion blade (1) having a shape in which a tip of a cylindrical tube is vertically cut is provided at a tip (4) of a head body (3). The head body (3) is inserted into and fixed to the base portion (5) of the propulsion blade (1) so as to project further forward than the tip (4) of the head body (3). Ribs to the inner surface of the (6)
And a screw is threaded on the rear end of the head portion main body (3).

When this is used, rotational force and propulsion force are transmitted from the propulsion device (not shown) to the head body (3),
The head unit body (3) is propelled while rotating, and when an error occurs in the propelling direction with respect to a desired direction, the rotation of the head unit body (3) is stopped, and a notch at the tip thereof. The soil pressure is applied to (2) to correct its direction, and after correcting the direction, it is propelled while rotating again to reach the destination.

As shown in FIG. 3, when the propulsion direction has an error in the direction (b) with respect to the desired direction (a),
First, the rotation of the head body (3) is stopped, the notch (2) of the propulsion blade (1) is rotationally adjusted to the desired direction (a) side with respect to the wrong direction (b), and the state is maintained. Then, the rib (6) regulates the direction in the earth and sand in front of the head main body (3), and then proceeds straight according to this, and when slightly propelled, Notch (2)
Earth and sand is deposited inside the head and at a position in front of the tip (4) of the head body (3), and even if the surface of the sediment (7) is uneven, the rib (6) is generally present. Edge (8)
When it is further promoted, the resistance of the surrounding earth and sand temporarily acts on the accumulated earth and sand (7) and secondarily on the notch (2) (see Fig. 3-b). ) As a result, the direction can be corrected to the desired direction (a) (see FIG. 3C).

In addition, in order to adjust the resistance of earth and sand according to the soil quality,
The shape of the sediment (7) can be changed by changing the protruding length of the cutout (2) from the tip (4) of the head body (3) and the shape of the rib (6). As a result, the resistance of the soil can be adjusted.

As shown in FIG. 4, the target for detecting the occurrence of the error in the direction is the screw (9) engraved on the rear end of the head body (3) and the tip of the target body (10). By screwing the provided screw (11) into the socket (12), the head body (3) and the target body (10) can be attached and detached.

Here, the head body (3) and the target body (10)
When and are screwed and connected to the socket (12), depending on the screwing state, the position of the target (13) that is regularly arranged on the tubular body (15) in the target body (10) Is not constant, and it becomes impossible to judge in which direction and how much the head body (3) should be rotated when correcting the direction. However, the tubular body (15) should be placed inside the target body (10). If the cylindrical body (15) can be pressed and fixed by the fixing bolts (16) and the like, the head main body (3) and the target main body (10) are connected to each other. After that, the tubular body (15) may be adjusted to a predetermined body and fixed with the fixing bolts (16).

Further, the target body (10) is independent of the head body (3), and the tubular body (15) having the target (13) rotates inside the target body (10). Since it is possible to press and fix the tubular body (15) with the fixing bolt (16),
It is extremely easy to take out the tubular body (15) from the target portion main body (10), and replacement and repair in the event of a failure in the tubular body (15) are extremely easy.

In this way, the propulsion blade (1) at the tip of the head body (3)
Since the shape of the above is a shape in which a cylindrical tube is cut out, it is possible to easily perform heat treatment or the like on the tip end portion of the cutout portion (2) and the end portion on the rotation direction side (hatched portion in FIG. 5), and the portion is hardened. By doing so, a strong propelling blade (1) can be constructed.

Also, the head body (3) and the target body (1
(0) is screwed into the target section body (1
0) and the head part main body (3) can be easily separated, and the cutout part (2) of the head part main body (3) having the shape as shown in FIG. The same target body (10) with different protruding lengths
It is possible to use it by screwing it into a single target part main body (10), and if several kinds of head part main bodies (3) with different protruding lengths of the cutout part (2) are prepared, That is necessary and sufficient.

Further, the tubular body (1
Since the fixing of 5) is simply pressed by the fixing bolts (16), it can be easily removed and its repair and the like are extremely easy.

(Effect) As described above, in the present invention, the fixed idea that the cross-sectional shape of the tip of the head portion main body must be wedge-shaped in order to correct the direction is abandoned, and the shape is changed to the shape in which the cylindrical tube is cut out As a result, it is possible to heat-treat only the contact portion with the earth and sand and to cure the portion, and the life of the head main body can be greatly extended.

In addition, since the head body and the target body can be screwed together to be joined, both of the above can be attached and detached, and only the head body can be replaced, and a single target body is sufficient. Yes, it is extremely economical.

[Brief description of drawings]

FIG. 1 is a perspective view of a lead tube propulsion head. FIG. 2 is a sectional view taken along line AA. FIG. 3 is an explanatory diagram showing an operating method. FIG. 4 is a cross-sectional view showing a connected state of the head portion main body and the target portion. FIG. 5 is an enlarged view of the tip of the cutout portion. 1 …… Propulsion blade 2 …… Notch 3 …… Head body 4 …… Tip 5 …… Base 6 …… Rib 7 …… Sand and sand 8 …… End 9 …… Screw 10 …… Target body 11… … Screw 12 …… Socket 13 …… Target 14 …… Battery 15 …… Cylinder 16 …… Fixing bolt a …… desired direction b …… wrong direction

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A propelling blade having a shape in which only the tip of a cylindrical tube is vertically cut out by about 2/3 to 4/5 so that the notch of the propelling blade projects forward from the tip of the head body. In addition, and fixed in a state in which the head body tip is inserted in the cylindrical base of the propulsion blade, from the head body tip to the inner surface of the propulsion blade along the notch vertical center line of the propulsion blade. A head for correcting the direction of a lead tube, characterized in that a rib is provided and a screw for connecting the main body of the target portion is engraved at the rear end of the main body of the head portion.