JPS58138898A - Impact type propelling apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single thrust type propulsion device using compressed air, etc., which is used when laying pipes underground under roads, tracks, etc. This invention relates to an impact type propulsion device that has excellent performance, high ratification efficiency, and can be easily thrust even on gravel ground.

Conventionally, in this type of impact-type propulsion device using compressed air, etc., the first step is to strike a chisel provided at the tip of the propulsion head with a piston built in the main body and operated by compressed air.・There is one that pushes the entire RAD into the ground in a fixed direction.

However, since the impact type propulsion device moves forward by directly consolidating and removing the ground, the frictional force with the surrounding ground is large, and the propulsion head itself (which only moves forward through the ground without rotating) The frictional resistance between this part and the surrounding ground is extremely strong, and there is also a problem with the propulsion ability.

1. As shown in Fig. 1, the second propulsion device has an oblique tip with a sharp cutting edge Af: connected to the propulsion tube B having approximately the same diameter, and the propulsion tube B has one tip. A buried pipe C-4 with a slightly larger diameter is fitted and fixed on the outer periphery of the propulsion pipe B in a protruding manner with an appropriate tip several pieces, and a face Ei is fixed to the tip of the cutting edge A, and the cutting edge is rotated. A system has been proposed in which the diameter of the ground to be excavated is equal to the outer diameter of the mounting member, and the cutting edge A and the propulsion pipe Bi are advanced while being rotated.

However, even in the second propulsion device, the buried pipe C itself does not rotate and moves forward only by the thrust of the propulsion pipe. However, the entire outer circumferential surface of the buried pipe C exerts a large frictional force with the excavated soil and the surrounding ground, and in order to overcome this frictional force and move the entire device forward, it is necessary to must be extremely large-scale.

Furthermore, since the cutting edge A and the propulsion tube B have the same diameter, the cutting edge A
When the propulsion speed increases due to the thrust applied to this, the penetration length of the cutting edge A into the ground increases, and due to the influence of the slanted cutting edge, it is propelled through a hole with an outer diameter slightly larger than the diameter of the cutting edge A, so it cannot move forward. As the blade moves forward, the weight of the propulsion tube causes the cutting edge to move downward, and the cutting edge moves downward from the desired direction.

The present invention solves the above-mentioned conventional problems, and its main purpose is to be able to move straight in the target direction accurately, to minimize the resistance between the cutting edge and the excavated ground, and to achieve efficient propulsion. To provide an impact type propulsion device in which the frictional resistance between a pipe and the surrounding ground is minimized.

For this purpose, the impact type propulsion device of the present invention has a chisel provided on the propulsion head so as to be movable back and forth, and a sloped tip portion is attached to the tip of the chisel.
At the same time, a blowing force is applied to the chisel by air 7, and at the same time, the chisel is made up of an enlarged hole fitted at a predetermined distance from the slanted tip part on the outer periphery of the chisel, and the slanted tip part. The tip of the cutting edge is rotated and propelled together with the two propelling heads.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an overall view of the impact type propulsion device according to the present invention when it is applied to the installation of a pipe crossing under a road. 1 is a propulsion head, and 2 is a propulsion pipe connected to the rear end of the propulsion head 1. The propulsion head 1 and the propulsion pipe 2 are arranged in a direction that crosses the road 3 from one shaft 4 (only one shaft is shown in FIG. 2) formed between the roads 3 into the ground below the road 3. The propulsion is achieved by the action of striking a chisel 12 provided at the tip of the propulsion head 1 by a compressed air type nozzle mechanism (described later) built into the propulsion head 1, and by the action of hitting the chisel 12 provided at the tip of the propulsion head 1. This is carried out by the action of a rotary propulsion device 60 installed at.

The rotary propulsion device 6 has a main body 8 installed on a base 7 so as to be able to move forward and backward. Equipped with a function to rotate the entire propulsion tube 2 including the head 1,
The main body 8 can be moved in the forward and backward directions by a hydraulic jack 9 such as air.

FIG. 3 is a sectional view showing details of the propulsion head 1, which includes a cylindrical casing 10 of a predetermined length.
One end of a cylindrical chisel holding member 11 is coaxially screwed onto the tip of the cylindrical casing 10.

The head side of the chisel 12 is fitted into the holding member 11 so as to be slidable in the axial direction of the holding member 11, and the head side step portion 12a of the chisel 12 and the holding member 11
A compression screw 13 arranged concentrically with the chisel 12 is interposed between the step portion 11a on the other end side of the inside, so that the chisel 12
is biased in the direction of retreat (direction of arrow X).

A stopper 14 is attached to the inner wall of the cylindrical casing 10 facing the head 12b of the chisel 2 to prevent the chisel 12 from retreating beyond a certain value.

Further, a chisel 1 is provided at the tip of the chisel holding member 11.
One end of the enlarged hole 15, which is watertightly fitted to the outer periphery of the outward protrusion of the holding member 11 of No. 2 and is integrated with the chisel 12, is fitted so as to be slidable in the axial direction. A plurality of pins 16 are provided between the hole 15 and the holding member 11 to allow movement in the axial direction and prevent relative rotation.
interconnected.

The first round of the enlarged r1 portion 15 is formed into a step-like shape whose diameter decreases toward the tip due to a step portion 15a.

The tip portion 12 of the chisel 12 protrudes forward of the enlarged hole portion 15.
In c, hole enlarged FBI! ] A tip inclined portion 17 is integrally attached at a predetermined distance from s.

As shown in the figure, the tip slanted portion 17 has a sharp shape obtained by cutting a cylinder diagonally at a predetermined angle with the axis thereof, and the pointed end 17a is eccentrically outward from the axis Y of the chisel 12. It has become.

In this embodiment, the angle between the oblique side and the axis Y is 37 degrees.

1, the chisel tip 12c between the enlarged hole part 15 and the inclined tip part 17 has a smaller diameter than the proximal end 17b of the inclined tip part 17, and the proximal end 17b and the enlarged hole part A concave portion 1.2 d having a constant D1 is formed between the tip of the tip 15 and the tip of the concave portion 1.2 d.

Thus, the tip inclined portion 17, the concave portion 12d following this, and the enlarged hole portion 15 constitute a tip cutting edge portion zl.

18 is a chisel head 12 inside the cylindrical casing 1o.
b (This is an air hammer installed in Jjl, and the hammer head 18a is connected to the lll1lI line of the cylindrical casing 1o to the kite F The hammer head 18 is moved in the direction by operating a piston (not shown) by the raw cotton air supplied to the air hammer 18.
3. The propulsion head 1 having such a configuration is coupled to the front end of the propulsion tube 2 via a coupling mechanism 20, as shown in FIG. 1, the coupling mechanism 20 is configured to be able to transmit the rotational force and Jff advance force applied to the propulsion tube 2 to the propulsion head 1.
A cylindrical connecting member 21 that is removably fitted to the rear end of the cylindrical casing 10 for the 411 helical head, and a cylinder that is connected to the front end of the propulsion tube 2 through a tube part 22 that is removably fitted to the front end of the propulsion tube 2. The connecting member 23'ff has a shape, and the connecting member 23 is fitted into the connecting part 4421, and a fifth
As shown in the figure, a plurality of grooves 23a (four in this embodiment) are formed parallel to the axis with a phase of 90 degrees.

Furthermore, four holes 21ai are formed in the outer wall of the connecting member 21 with a phase of 90 degrees, and the grooves 23a correspond to the steel balls 20ai that are movably accommodated in each hole 21a.
By engaging with the connecting members 21 and 23 and thereby permitting relative movement in the axial direction and prohibiting their relative rotation, the impact force applied from the air hammer 18 to the chisel 12 is not transmitted to the propulsion tube 2. In addition, the propulsion pipe 20
This allows rotation to be transmitted to the propulsion head 1.

Further, on the axis of the propulsion tube 2 circle, a supply tube 24 is arranged along the entire length of the propulsion tube 2, and is supported by a supporter 25, and at the insertion end of the air supply tube 24 into the propulsion tube 2, One end of an air supply pipe 27 connected to the air hammer 18 via a joint member 26 is slidably and airtightly connected.

Furthermore, a compressed air source (not shown) is connected to the rear end of the air supply pipe 24 protruding from the retreat opening of the propulsion pipe 2 via a swivel 28.
An air supply hose 29 is connected to the air supply hose 29.

Next, the monthly promotion operation of this embodiment configured as described above will be explained.

The propulsion head 1 and the propulsion tube 2 are connected to each other in a straight line, and the propulsion head 1 is connected to the road 3 as shown in FIG.
In a state where the propulsion pipe 2 including the propulsion head 1 is receiving rotation and propulsion force from the rotary propulsion device 6, the compressed air hose from the compressor etc. enters the ground below in a direction that crosses it, and the propulsion pipe 2 including the propulsion head 1 is receiving rotation and propulsion force from the rotary propulsion device 6. 29. Swivel 28. Air is supplied to the hammer 18 through the air supply pipe 211 and the air supply vibrator 27, and the hammer [8] operates, and the hammer head 18a strikes the head 12b'i of the chisel 12.

For this reason, the chisel 12 holds the compression spring 13 inside the holding member 11.
The inclined tip portion 1 at the tip of the chisel 12 is moved forward against the
7 serves as a bit and penetrates into the ground. As a result, the propulsion head 1 is pushed forward into the ground while removing the ground, and at the same time, the entire propulsion head 1 is also moved forward by the impact force of the air hammer 18, and a horizontal hole necessary for laying the pipe is formed in the ground. , At this time, the propulsion head] and the propulsion tube 2 are connected by the groove 23a and the steel ball 20a, so even if the propulsion head 1 moves forward with the impact force of the air hammer 18, the propulsion force is not absorbed by the coupling mechanism 20. The reaction force is absorbed by the propulsion tube 2 as follows:
Furthermore, the /h color of this example is the same as the propulsion tube 2.
2. The entire cutting edge portion Z receives rotational force and impact propulsion force.

That is, as shown in FIG. 6, the tip slanted portion 17 of the tip tip portion 2 receives the rotational driving force together with the above-mentioned impact force, rotatably cuts the ground F, and fractures the ground F with the same diameter as the tip slanted portion 17. Then, a circular pilot hole G is formed.

In addition, the excavated and crushed soil is smoothly removed backwards due to the formation of the concave portion 12d, and then is removed by the hole expansion portion 15 having stepped portions 1 and 5a formed in a step-like manner. ” The second pilot hole G is expanded step by step without any difficulty, and finally a hole with the same diameter as the propulsion head 10 and the propulsion tube 2 is formed.
Since the hole is enlarged at , the propulsion tube 2 can move forward smoothly.

In addition, since the propulsion tube 2 itself is also rotating and vibrating at this time, there is little frictional resistance with the tube wall, and the propulsion performance is high.

Further, due to the action of the enlarged hole portion 15, the propulsion head 10
Since it exhibits the characteristic of advancing along the guide hole G parallel to the central axis Y, the accuracy of straightness is significantly improved.

In addition, the reason why the distal end slanted portion 17 is formed to have a fit degree of 37 degrees in this embodiment is due to the following reason. At the tip oblique angles above, the tip press-fit resistance is large;
710 to 1.・No soil wedge occurs, but
↑The applicant has measured that the instant friction resistance of the single-shaped surface increases and the tip press-fit resistance increases. This is because the blade can be twisted with the least amount of force if the tip is at an acute angle of about 37 degrees.

As the propulsion head 1 and the propulsion pipe 2 are propelled into the ground, the rear ends of the propulsion head 1 and the air supply pipe 24 are sequentially connected to the other single-advance pipes 2 and the air supply pipe 24, respectively. . After Mi propulsion, the supporter 25 that supports the air supply pipe 24 is not integrally connected to the propulsion pipe 2, so the air supply pipe 24 and the porter 25 can be pulled out, and the propulsion pipe 2 is completed as a conduit. and used.

Furthermore, if the propulsion direction deviates from the intended trajectory due to the propulsion of the propulsion/RAD 1 and propulsion tube 2 into the ground, the body surface of the slanted portion 17 is turned in the opposite direction of the trajectory, and the propulsion head 1 By propelling the propulsion head 1 without rotating, it is possible to gradually change the orientation of the propulsion head 1 and correct the direction due to the effect of the slanted portion 17.

As described above, according to the present invention, the tip of the chisel that is movably provided on the propulsion head is provided with a slanted tip, and at the same time, the outer periphery of the chisel is A cutting edge g that is composed of a hole enlarged part fitted at a predetermined distance # from the inclined tip part to the inclined tip part.
("fr) Since it is designed to be rotated and propelled together with the above propulsion head, the straightness is very high, the resistance between the tip of the cutting edge and the excavated ground is small, and the frictional resistance between the slender propulsion pipe and the excavation ground is also small. It has high propulsion performance.Furthermore, even if there is gravel underground, it can be easily propelled.The impact-type propulsion head installed at the tip of the propulsion tube prevents vibrations, so the propulsion tube The rotational force applied to the shaft can be reduced, and since the impact type propulsion head itself has propulsion capacity, the propulsion force can be reduced, making it possible to downsize and reduce the power of the rotary propulsion device installed in the shaft. At the same time, the propulsion length can be increased, which has a revolutionary effect compared to the conventional one.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a conventional propulsion device, Fig. 2 1 is an overall configuration diagram when the impact type propulsion device according to the present invention is applied to laying pipes under roads, etc., and Fig. 3 is a diagram of the present invention. FIG. 4 is a sectional view showing details of the propulsion head and propulsion tube in the embodiment; 5th is a sectional view showing details of the propulsion head and the propulsion tube in the embodiment; The cross-sectional view taken along the line, FIG. 6, is a clear view showing the excavation mode of the tip of the cutting edge in this embodiment. 1. Propulsion head, 2. Propulsion tube, 12. Chisel, 1
2d...Concave part, ]5... Enlarged hole part, 17... Slanted tip part, ``8... Air hammer, Z... Tip part.

Claims (3)

[Claims] (1) It has a chisel that can move forward and backward, and a propulsion head that has a built-in air hammer that propels the chisel by striking it, and has a slanted tip part attached to the tip of the chisel, and a slanted tip part on the outer periphery of the chisel. An impact-type propulsion device comprising: a cutting edge portion consisting of a shaped portion and a hole-enlarged portion fitted at a predetermined distance; and a means for rotating together with the propulsion head. (2) The impact type propulsion device according to claim 1, wherein the tip inclined portion has an angle of about 37 degrees. (3) The chisel between the slanted tip portion and the enlarged hole portion has a smaller diameter than the proximal end of the slanted tip portion to form a concave portion. The impact type propulsion device according to item 2.