JP2866577B2 - Propulsion body for propulsion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of propulsion pipes which are flexibly connected to each other, and a propulsion head for excavating earth and sand is flexibly connected to a tip propulsion pipe. A tubular propulsion head body, a drive shaft fitted inside the propulsion head body so as to be able to drive around the longitudinal axis and drive in and out of the propulsion direction, and a leading conductor attached to the tip of the drive shaft A slope for receiving the earth pressure along with the underground propulsion of the propulsion head and directing the propulsion direction of the propulsion head in the direction of the earth pressure to the front portion of the tip conductor. The present invention relates to a propulsion body for a propulsion method having a pressure receiving surface.

[0002]

2. Description of the Related Art Conventionally, in the above-described propulsion body for a propulsion method, only one surface of the inclined pressure receiving surface is formed on a main body portion of a leading conductor (hereinafter, referred to as a leading conductor body) so as to reduce the steering ability during turning. For the purpose of supplementing, a tongue-shaped overcutter for extending the inclined pressure receiving surface further forward is fixed to the tip of the leading conductor main body, and the tip of the overcutter is moved from the outer peripheral portion of the leading conductor main body. It protruded to the radially outward side. And when going straight in the ground, the tip conductor is protruded from the propulsion head body while rotating in one direction around the axis, excavating and propelling a certain distance in the ground, and propelled by the amount of the tip conductor protruding. The main body of the propulsion head from the rear to retreat the leading conductor relative to the propulsion head body, and then excavate the ground by protruding the leading conductor from the propulsion head body while rotating the leading conductor in the opposite direction. Then, it was going straight underground by this repetition. That is, as described above, the leading conductor is rotated in reverse for each stroke to maintain the straightness. Also, when changing the direction by bending the underground, the tip conductor is not rotated as described above, and the tip conductor is pushed in with the inclined pressure receiving surface facing the side opposite to the side to be turned. there were.

[0003]

However, according to the above-mentioned conventional construction, the tip of the overcutter protrudes radially outward from the outer periphery of the leading conductor body, and furthermore, the overcutter is connected to the leading conductor body. Because the tip end of the overcutter interferes with the inner wall of the underground hole, and when the vehicle is running straight as described above, the tip conductor receives rotational resistance from the inner wall, and the load only increases. However, the propulsion head body is easily rolled, and it takes time to correct the rolling. Further, when the propelling body is fed into the ground through a guide pipe pierced into the ground, there is a risk that the tip of the over cutter is caught on the guide pipe. SUMMARY OF THE INVENTION An object of the present invention is to compensate for the lack of steering ability at the time of turning, and to increase the load caused by receiving rotational resistance from the inner wall of an underground hole and to roll the propulsion head body when traveling straight. An object of the present invention is to provide a propulsion body for a propulsion method, which can prevent the propellant from being caught on a guide tube.

[0004]

In order to achieve the above object, the characteristic structure of the propulsion body for a propulsion method according to the present invention is that the inclined pressure receiving surface is formed by a first inclined pressure receiving surface on the base end side and a first inclined pressure receiving surface on the tip end side. Second
The tip conductor is divided into an inclined pressure receiving surface, and the leading conductor is constituted by a leading conductor main body having the first inclined pressure receiving surface, and a tongue-shaped tip conductor front portion forming member having the second inclined pressure receiving surface,
The front conductor front forming member is pivotally connected to the front conductor body so that the front conductor front forming member can swing in the direction of the back side of the second inclined pressure receiving surface, and the front conductor front forming member is connected to the front conductor main body. Second
In a state of swinging in the back side direction of the inclined pressure receiving surface, the leading end of the leading conductor front forming member is allowed to protrude radially outward from the outer peripheral portion of the leading conductor body so that the leading conductor front forming member can be protruded. The effect is as follows.

[0005]

In other words, when the direction is changed, when the leading conductor is applied to the inner wall of the underground hole, the leading conductor front forming member swings in the direction of the back side of the inclined pressure receiving surface due to the earth pressure. As a result, the tip body is inclined with respect to the leading conductor and the head main body, and the leading end thereof protrudes radially outward from the outer peripheral portion of the leading conductor body. Then, when the leading conductor is pushed and propelled without rotating around the axis in this state, the leading conductor changes its direction in the direction of the earth pressure.
In this way, the front conductor front forming member changes its direction in a state where the front end portion is in the above-mentioned inclined posture and the front end protrudes radially outward from the outer peripheral portion of the front conductor main body. Can make a small turn. On the other hand, when moving straight, the conductor is pushed in while rotating around the axis. In this case, since the leading conductor front forming member and the leading conductor body are pivotally connected to each other, even if the leading conductor front forming member interferes with the inner wall of the underground hole, the resistance force received from the inner wall is inclined. Can be escaped in the front direction. As a result, it is possible to reduce the rotational resistance received from the inner wall of the underground hole, prevent an increase in load, prevent the propulsion head from rolling, and eliminate the time and effort required for repairing the conventional rolling. it can. Also, when the propelling body is sent into the ground through the guide pipe pierced into the ground, even if the front conductor front forming member interferes with the inner wall of the guide pipe, the resistance force received from the inner wall of the guide pipe is reduced by the inclined pressure receiving surface. Since the tip conductor can be released in the front side direction, the leading conductor can be hardly hooked on the guide tube. further,
Since no special mechanism is provided for swinging the front conductor front forming member, the front conductor front forming member is simply configured to swing freely by earth pressure, thereby simplifying the structure. be able to.

[0006]

[Effect of the Invention] Therefore, when turning, a small turn comes,
When traveling straight, the load can be prevented from increasing, and the effort required to correct the rolling can be omitted.When the propulsion unit is sent underground through the underground guide tube, the leading conductor is less likely to be caught on the guide tube. As a result, it is possible to provide a propulsion body for a propulsion method capable of improving economic efficiency and workability while compensating for a lack of steering ability because the structure can be simplified.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a group of pipes each having a cylindrical outer surface, that is, a small diameter (for example, a propulsion head 1 having an outer cylindrical surface and a plurality of propulsion tubes 2 having an outer cylindrical surface) (Around 100mm or less)
The propulsion body for a propulsion method is constructed in such a way that the pipe group is bent and connected via a joint portion J so that the pipe group is propelled by a pushing device (not shown) while being bent in the soil. Have been.

The propulsion head 1 is fitted inside a tubular propulsion head body 1A such that the propulsion head 1 can be driven to rotate around the axis P along the longitudinal direction of the propulsion head body 1A and to be able to drive in and out of the propulsion direction. A piston portion 12 (an example of a drive shaft) is provided, and a leading conductor 3 having a diameter larger than that of the piston portion 12 and substantially the same diameter as the head main body 1A is attached to the tip of the piston portion 12, and the leading conductor 3 is connected to the piston portion. Head body 1 with 12
A rotary mechanism 4 for rotating around the axis of A and a telescopic mechanism 5 for operating the tip conductor 3 with respect to the head body 1A in the axial direction are provided. The tip conductor 3 has a rotating shaft 8 fitted inside the head main body 1A so as to be rotatable around the axis.
And the cylindrical portion 14 of the piston portion 12 of the tip conductor 3 and the piston portion 12 and its piston portion 12
By being fitted to the cylinder portion 13 of the head body 1A, the head body 1A is supported so as to be relatively rotatable and relatively movable along the axial direction with respect to the head body 1A. An inclined pressure receiving surface F for receiving the earth pressure accompanying the underground propulsion of the propulsion head 1 and directing the propulsion direction of the propulsion head 1 to the direction receiving the earth pressure is provided on the front portion of the tip conductor 3. Is formed. Although not shown, a known sliding material discharging means for discharging a sliding material for reducing a frictional resistance between the earth and sand and the group of pipes is provided at the distal end of the leading conductor 3.

The leading conductor 3 is spline-fitted to a solid portion at the tip of the piston portion 12 and is fixed to the solid portion with a bolt B from the axial direction. The configuration of the tip conductor 3 will be described in more detail. As shown in FIGS. 1, 4, and 5, the inclined pressure receiving surface F is formed by a first inclined pressure receiving surface F1 on the base end side and a second inclined pressure receiving surface on the distal end side. F2 and divided into 3
Is composed of a leading conductor body 3A having a first inclined pressure receiving surface F1 and a tongue-shaped leading conductor front forming member 3B having a second inclined pressure receiving surface F2, and the leading conductor front forming member 3B is formed of a second conductor. The front conductor front forming member 3B is pivotally connected to the front conductor main body 3A via a pin 19 so as to be swingable in the rear side direction of the inclined pressure receiving surface F2. Then, in a state where the front conductor front forming member 3B swings in the back side direction of the second inclined pressure receiving surface F2, the front end of the front conductor front forming member 3B is more radially outward than the outer peripheral portion of the front conductor main body 3A. The front conductor front forming member 3B can protrude to the side.
Is formed.

The turning mechanism 4 includes a propulsion head body 1A.
Spiral groove 6 formed in a part of the inner peripheral surface of
And a spline shaft portion 8a meshing with a spline hole portion 7b formed on the inner surface side of the hydraulic piston 7 with a screwing convex portion 7a screwed into the hydraulic head 7A. Is supplied / discharged to / from a rotating shaft 8 formed on the outer peripheral portion and pressure receiving chambers 10 on both sides of the piston head 7c of the hydraulic piston 7, and the hydraulic piston 7 is reciprocated in the axial direction of the head main body 1A. A pair of pressure oil supply paths 9
A, 9B (see FIG. 2). Inside the rotating shaft 8, apart from the two hydraulic pipes constituting the pressure oil supply passages 9A and 9B, there are formed supply / discharge passages 11 of the pressure oil to the expansion / contraction mechanism 5, which will be described later. The supply / discharge passage 11 and the hydraulic piping are both guided to the rear propulsion pipe 2 via the joint J. In the rotating mechanism 4 configured as described above, the pressurized oil is supplied from the one pressurized oil supply passage 9A (or 9B) to the propulsion head main body 1A, and the propelled oil is supplied to the other pressurized oil supply passage 9B (or 9A). When the hydraulic oil is returned from the head main body 1A, the hydraulic piston 7 reciprocates. With this movement, the hydraulic piston 7 that has the screwing convex portion 7a screwed into the spiral groove 6 of the head main body 1A becomes positive. It rotates in the opposite direction, and the rotation shaft 8 rotates in the forward and reverse directions following the rotation, and further, the leading conductor 3 is driven to rotate about the axis P in accordance with the rotation. Note that the tip conductor 3 has at least 36
It is designed to rotate 0 degrees or more.

The telescoping mechanism 5 has a bottomed cylindrical piston unit integrally formed with the leading conductor 3 so as to be slidably fitted on the rotating shaft 8 of the rotating mechanism 4 in the axial direction. 12
And a pressure for supplying pressure oil to a cylinder portion 13 of the head main body 1 </ b> A containing the piston portion and a supply / discharge passage 11 formed in the rotation shaft 8 to the internal space of the cylinder portion 13. And a fluid supply device (not shown). The telescopic mechanism 5 is provided with pressure receiving surfaces 12a and 14a on both the bottom of the cylindrical hole of the piston portion 12 and the rear end surface in the traveling direction of the piston portion 12, respectively.
Pressure chamber 1 between the end surface and the inner surface of cylinder portion 13
5 and 16 are formed. And, the two pressure chambers 15,
For 16, a communication passage 17 is provided to allow the flow of the pressure fluid from the pressure fluid supply device side. That is, the spline portion 8b formed on the outer peripheral surface of the rotation shaft 8 and the outer peripheral surface on the rear side in the propulsion direction from the place where the spline portion 8b is formed are formed in the cylindrical hole 14 of the piston portion 12.
The communication path 17 is formed slightly larger so as to form a gap that allows the flow of pressure oil.
Is composed. The telescopic mechanism 5 has the pressure chambers 15 and 16 only on the side where the leading conductor 3 is pushed out, and the pushing force of the subsequent propulsion pipe 2 moves in the direction in which the leading conductor 3 is pulled into the cylinder portion 13. It is configured to do so.

When the tube group is made to travel straight by using the propulsion body having the above structure, the hydraulic piston 7 is reciprocated by continuously sucking and discharging the pressure oil through the pressure oil supply passages 9A and 9B. The reciprocating movement pushes the propulsion pipe 2 while rotating the rotation shaft 8, that is, the leading conductor 3. In this case, since the leading conductor body 3A and the leading conductor front forming member 3B are pivotally connected to each other as described above, even if the leading conductor front forming member 3B interferes with the inner wall of the underground hole, the inner wall of the leading conductor main body 3A and the inner wall of the underground hole are not removed. The received resistance force can be released in the front side direction of the second inclined pressure receiving surface F2. As a result, when the tip conductor 3 rotates around the axis, the rotation resistance received from the inner wall of the underground hole is almost eliminated, so that an increase in load can be prevented and the rolling of the propulsion head main body 1A can be prevented.

When the direction is corrected using the propulsion body, as shown in FIG. 3, when the leading conductor 3 is brought into contact with the inner wall of the underground hole, the leading conductor front forming member 3B is brought into contact with the second conductor by the earth pressure. It swings toward the back side of the inclined pressure receiving surface F2 and is inclined with respect to the head main body 1A and the front conductor main body 3A, and the front conductor front part forming member 3
B is in a state in which the tip portion protrudes radially outward from the outer peripheral portion of the leading conductor body 3A. If the propulsion pipe 2 is pushed in while keeping the inclined pressure receiving surface F facing the side opposite to the side to be turned without rotating the tip conductor 3 as described above in this state, the inclined pressure receiving surface F Head 1 for propulsion under pressure
Is directed in a direction opposite to the inclined pressure receiving surface F, and the propulsion head 1 turns. In this case, since the front conductor front forming member 3B changes the direction in the inclined posture as described above, it is possible to make a small turn and improve the steering ability.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a side view showing a distal end side of a propulsion head of a propulsion body.

FIG. 2 is a sectional view of a propulsion head of the propulsion body.

FIG. 3 is a cross-sectional view around a leading conductor.

FIG. 4 is a front view of a tip conductor.

FIG. 5 is a plan view of a tip conductor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion head 1A Propulsion head main body 2 Propulsion tube 3 Lead conductor 3A Lead conductor main body 3B Lead conductor front forming member 12 Drive shaft F Inclination pressure receiving surface F1 First inclination pressure receiving surface F2 Second inclination pressure receiving surface

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Mitsuhiko Kamada 1-1-1, Hama, Amagasaki-shi, Hyogo Prefecture Inside Kubota Research Institute of Technology (72) Inventor Kazunori Tsujimoto 1-1-1, Hama, Amagasaki-shi, Hyogo Stock (56) References JP-A-5-321581 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9/06 311

Claims (1)

(57) [Claims] A plurality of propulsion tubes (2) are flexibly connected to each other, and a propulsion head (1) for excavating earth and sand is flexibly connected to a tip propulsion tube (2). Head (1) is connected to a tubular propulsion head body (1).
A), a drive shaft (12) which is internally fitted to the propulsion head body (1A) so as to be able to drive around the longitudinal axis and drive in and out of the propulsion direction, and a tip end of the drive shaft (12). And a tip conductor (3) to be attached.
An inclined pressure receiving surface for receiving the earth pressure along with the underground propulsion of the propulsion head (1) and directing the propulsion direction of the propulsion head (1) in the direction receiving the earth pressure. (F), the propulsion body for a propulsion method, wherein the inclined pressure receiving surface (F) is a first inclined pressure receiving surface (F
1) and a second inclined pressure receiving surface (F2) on the tip end side, and the leading conductor (3) is divided into the first inclined pressure receiving surface (F1).
And a tongue-shaped front conductor front forming member (3B) having the second inclined pressure receiving surface (F2).
And the front conductor front part forming member (3).
B) pivotably connects the front conductor front forming member (3B) to the front conductor main body (3A) so as to swing freely in the direction behind the second inclined pressure receiving surface (F2), Forming member (3
B) swings in the direction of the back side of the second inclined pressure receiving surface (F2), and the leading end of the leading conductor front forming member (3B) is more radially than the outer peripheral portion of the leading conductor body (3A). A propulsion body for a propulsion method, wherein the front conductor front forming member (3B) is formed so as to protrude outward.