JPH07259481A - Propulsive body for propulsive engineering - Google Patents

Abstract

PURPOSE:To prevent increase of a load and rolling of a head main body for propulsion caused by receiving rotational resistance from an inwall of an underground hole at the time of rectilinear propagation-while being capable of compensating for shortage of steering capacity at the time of changing directions. CONSTITUTION:A head 1 for propulsion consisting of a head main body 1A for propulsion, a drive shaft 12 and a guiding body 3 is connected to a propulsive pipe 2, and an inclined pressure receiving surface F to direct the propulsive direction of the head 1 for propulsion to the direction receiving earth pressure is formed on the guiding body 3. The guiding body 3 is constituted of a guiding body main body 3A furnished with a first inclined pressure receiving surface F1, and a tongue piece type guiding body front part forming member 3B furnished with a second inclined pressure receiving surface F2 by dividing the inclined pressure receiving surface F in the front and rear directions. The guiding body front part forming member 3B is pivotally supported and connected on to the guiding body main body 3A free to oscillate in the back side direction of the second inclined pressure receiving surface F2, and the guiding body front part forming member 3B is formed free to push its head end part to the outward side in the diametrical direction rather than the outer peripheral part of the guiding body main body 3A in the oscillating state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects a plurality of propulsion pipes to each other flexibly, and a propulsion head for excavating earth and sand is flexibly connected to the propulsion pipe at the tip of the propulsion pipe. A tubular propulsion head body, a drive shaft that is fitted in the propulsion head main body so as to be driven to rotate around the longitudinal axis and drive in the propulsion direction, and a forward conductor attached to the tip of the drive shaft. An inclination for directing the propulsion direction of the propulsion head in the direction of receiving the earth pressure due to the underground propulsion of the propulsion head, in the front part of the lead conductor. The present invention relates to a propulsion body for a propulsion method in which a pressure receiving surface is formed.

[0002]

2. Description of the Related Art Conventionally, in the propulsion body for the above-mentioned propulsion method, only one surface of the inclined pressure receiving surface is formed on the main body portion of the leading conductor (hereinafter referred to as the leading conductor body), so that the steering ability at the time of turning is insufficient. 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 lead conductor body, and the tip of the overcutter is fixed from the outer peripheral portion of the lead conductor body. It was projected to the outer side in the radial direction. And when going straight in the ground, while rotating the lead conductor in one direction around the axis, it is projected from the propulsion head main body to excavate and propel the ground for a certain distance. The head conductor is sent from the rear to retract the lead conductor relative to the propulsion head body, and then the lead conductor is rotated in the opposite direction while the lead conductor is projected from the propulsion head body to excavate the ground. Then, I was going straight through the ground by repeating this. That is, as described above, the front conductor is rotated in the opposite direction for each stroke to maintain the straightness. Also, when the direction is changed by curving in the ground, the front conductor is not rotated as described above, and the front conductor is pushed in with the inclined pressure receiving surface facing the side opposite to the side to be swung. there were.

[0003]

However, according to the above-mentioned conventional structure, the tip end of the overcutter protrudes radially outward from the outer peripheral portion of the lead conductor body, and the overcutter is also attached to the lead conductor body. Since the tip of the overcutter interferes with the inner wall of the underground hole because it was adhered to the front conductor, the front conductor receives rotational resistance from the inner wall when the vehicle goes straight ahead to perform the above-described rotation operation, and the load increases. Instead, the propulsion head body rolls easily, and it takes time to correct the rolling. Further, when the propelling body is fed into the ground through the guide pipe pierced into the ground, there is a risk that the tip portion of the over cutter is caught in the guide pipe. An object of the present invention is to compensate for the lack of steering ability at the time of changing direction, and at the same time, to increase the load and the rolling of the propulsion head main body due to the rotation resistance from the inner wall of the underground hole when going straight. Another object of the present invention is to provide a propulsion body for a propulsion method, which can prevent it from being caught in the guide pipe.

[0004]

In order to achieve the above-mentioned object, the characteristic structure of the propulsion body for propulsion method according to the present invention is such that the inclined pressure receiving surface is located at the first inclined pressure receiving surface at the base end side and at the tip end side. Second
The front conductor is divided into an inclined pressure receiving surface and the front conductor is composed of a front conductor main body including the first inclined pressure receiving surface and a tongue-shaped front conductor front portion forming member including the second inclined pressure receiving surface.
The front conductor front portion forming member is pivotably connected to the front conductor main body so that the front conductor front portion forming member is swingable in the direction opposite to the second inclined pressure receiving surface, and the front conductor front portion forming member is Second
In the state of swinging in the direction of the back side of the inclined pressure receiving surface, the front conductor front portion forming member is arranged so that the front end portion of the front conductor front portion forming member can protrude radially outward from the outer peripheral portion of the front conductor main body. It has been formed, and its action and effect are as follows.

[0005]

In other words, because of the above-mentioned structure, when the direction of the front conductor is changed, when the front conductor is applied to the inner wall of the underground hole, the front conductor front forming member is shaken by the earth pressure toward the back side of the inclined pressure receiving surface. It moves and inclines with respect to the lead conductor and the head main body, and the tip portion thereof is in a state of protruding outward in the radial direction from the outer peripheral portion of the lead conductor main body. Then, when the front conductor is pushed and propelled in that state without being rotated around the axis, the front conductor is turned in the direction in which the earth pressure is received.
In this way, the front conductor front portion forming member changes its direction in a state where the front end portion of the front conductor front portion forming member is in the inclined posture and is protruded outward in the radial direction from the outer peripheral portion of the front conductor main body. You can make a small turn. On the other hand, when going straight, the front conductor is pushed in while rotating around the axis. In this case, since the front conductor front forming member and the front conductor main body are pivotally connected to each other, even if the front conductor front forming member interferes with the inner wall of the underground hole, the resistance force received from the inner wall is inclined to the pressure receiving surface. It can escape to the front side direction. As a result, the rotation resistance received from the inner wall of the underground hole can be reduced to prevent an increase in the load, and also the rolling of the propulsion head main body can be prevented, which saves the labor required for the conventional rolling correction. it can. In addition, when the propelling body is fed 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 Since it can be released in the front side direction, it is possible to make it difficult for the leading conductor to be caught by the guide tube. further,
The structure is simplified because the front conductor front portion forming member is configured to freely swing by earth pressure without providing a special mechanism for swinging the front conductor front portion forming member. be able to.

[0006]

[Effects of the Invention] Therefore, when turning, a small turn is heard,
When going straight, the load can be prevented from increasing, and the labor required to correct the rolling can be saved.When the propelling body is sent into the ground through the underground guide pipe, the guide conductor is less likely to be caught by the guide pipe. Since it is possible to simplify the structure, it is possible to provide a propulsion body for a propulsion method which can improve the economical efficiency and workability while compensating for the lack of steering ability.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1 and FIG. 2, a small caliber (for example, a small diameter (for example, a propelling head 1 having a cylindrical outer surface and a plurality of propelling tubes 2 having an outer cylindrical surface), each outer surface of which is a cylindrical surface, is formed. (Around 100 mm or less)
A flexible body for propulsion method is constructed by bending the flexible tubular body group through a joint portion J so as to be propelled by a pushing device (not shown) while bending the flexible tubular body group in the soil. Has been done.

The propulsion head 1 is fitted in a tubular propulsion head main body 1A, which is driven and rotated about an axis P extending in the longitudinal direction with respect to the head main body 1A and can be driven in and out in the propulsion direction. A piston portion 12 (an example of a drive shaft) is provided, and a front conductor 3 having a diameter larger than that of the piston portion 12 and substantially the same diameter as the head body 1A is attached to the tip of the piston portion 12, and the front conductor 3 is attached to the piston portion. Head body 1 with 12
A rotating mechanism 4 for rotating around the axis of A and an expanding / contracting mechanism 5 for moving the leading conductor 3 in and out of the head body 1A in the axial direction are provided. The lead conductor 3 is a rotary shaft 8 that is fitted in the head body 1A so as to be rotatable around its axis.
And the cylindrical hole 14 of the piston portion 12 of the leading conductor 3, and the piston portion 12 and the piston portion 12 thereof.
By being fitted to the cylinder portion 13 of the head main body 1A which is externally fitted to the head main body 1A, the head main body 1A is supported so as to be relatively rotatable and relatively movable in the axial direction. An inclined pressure-receiving surface F for receiving earth pressure along with the ground propulsion of the propulsion head 1 and for directing the propulsion direction of the propulsion head 1 in the direction in which the earth pressure is applied to the front portion of the front conductor 3. Has been formed. Although not shown, a well-known lubricant discharging means for discharging a lubricant for reducing frictional resistance between the earth and sand and the tube group is provided at the tip of the front conductor 3.

The front conductor 3 is spline-fitted to the solid portion of 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 front conductor 3 will be described in more detail. As shown in FIGS. 1, 4, and 5, the inclined pressure receiving surface F is defined as a first inclined pressure receiving surface F1 on the base end side and a second inclined pressure receiving surface on the tip end side. Divide into F2 and lead conductor 3
Is composed of a front conductor main body 3A having a first inclined pressure receiving surface F1 and a tongue-shaped front conductor front portion forming member 3B having a second inclined pressure receiving surface F2, and the front conductor front portion forming member 3B is second. The front conductor front portion forming member 3B is pivotally connected to the front conductor main body 3A via a pin 19 so as to be swingable in the direction opposite to the inclined pressure receiving surface F2. Then, in a state in which the front conductor front portion forming member 3B is swung in the direction behind the second inclined pressure receiving surface F2, the front end portion of the front conductor front portion forming member 3B is radially outward from the outer peripheral portion of the front conductor main body 3A. Front conductor front part forming member 3B that can be protruded to the side
Has been formed.

The rotating mechanism 4 comprises a propulsion head body 1A.
Spiral groove 6 formed on a part of the inner peripheral surface of the
A hydraulic piston 7 having a screwing convex portion 7a that is screwed into the inside of the propulsion head main body 1A, and a spline shaft portion 8a that meshes with a spline hole portion 7b formed on the inner surface side of the hydraulic piston 7. Is supplied to and discharged from a rotary 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 to reciprocate the hydraulic piston 7 in the axial direction of the head body 1A. A pair of pressure oil supply paths 9
A and 9B (see FIG. 2). Inside the rotating shaft 8, a pressure oil supply / discharge passage 11 for the expansion / contraction mechanism 5 to be described later is formed in addition to the two hydraulic pipes forming the pressure oil supply passages 9A and 9B. Both the supply / discharge passage 11 and the hydraulic pipe are guided to the rear propulsion pipe 2 through the joint portion J. In the rotating mechanism 4 configured as described above, the pressure oil is supplied from one pressure oil supply passage 9A (or 9B) to the propulsion head main body 1A, and the other pressure oil supply passage 9B (or 9A) is used for propulsion. When the pressure oil is returned from the head main body 1A, the hydraulic piston 7 reciprocates. With the movement, the hydraulic piston 7 having the screwing convex portion 7a screwed into the spiral groove 6 of the head main body 1A is positively moved. On the contrary, the rotary shaft 8 rotates in the forward and reverse directions following the rotation, and further, the front conductor 3 is driven to rotate around the axis P by following the rotation. It should be noted that the leading conductor 3 is at least 36 during one reciprocation of the hydraulic piston 7.
It is designed to rotate 0 degrees or more.

The expansion / contraction mechanism 5 is a bottomed cylindrical piston portion integrally formed with the front conductor 3 so as to be slidably fitted on the rotation shaft 8 of the rotation mechanism 4 in the axial direction. 12
And a cylinder portion 13 of the head body 1A that houses the piston portion, and a pressure for supplying pressure oil to the internal space of the cylinder portion 13 via a supply / discharge passage 11 formed in the rotating shaft 8. And a fluid supply device (not shown). This expansion / contraction mechanism 5 is provided with pressure receiving surfaces 12a and 14a on both the bottom portion of the cylindrical hole of the piston portion 12 and the rear end surface of the piston portion 12 in the traveling direction, and the rotating shaft 8 is provided.
The pressure chamber 1 is provided between the end surface and the inner surface of the cylinder portion 13.
5 and 16 are formed. And both the pressure chambers 15,
16 is provided with a communication passage 17 which allows the pressure fluid to flow from the pressure fluid supply device side. That is, with respect to the spline portion 8b formed on the outer peripheral surface of the rotating shaft 8 and the outer peripheral surface on the rear side in the propulsion direction with respect to the place where the spline portion 8b is formed, the cylindrical hole 14 of the piston portion 12 is provided.
Is formed to be slightly larger so that a gap is formed that allows the flow of pressure oil.
Are configured. The expansion mechanism 5 is provided with the pressure chambers 15 and 16 only on the side from which the front conductor 3 is pushed out. It is configured to be performed.

When the group of pipes is moved straight using the propelling body having the above structure, the hydraulic oil is continuously sucked and discharged through the hydraulic oil supply paths 9A and 9B to reciprocate the hydraulic piston 7. The reciprocating movement pushes the propulsion tube 2 while rotating the rotary shaft 8, that is, the front conductor 3. In this case, since the leading conductor main body 3A and the leading conductor front forming member 3B are pivotally connected as described above, even if the leading conductor front forming member 3B interferes with the inner wall of the underground hole, The resistance force received can be released to the front side direction of the second inclined pressure receiving surface F2. As a result, when the front conductor 3 rotates about the axis, the rotational resistance received from the inner wall of the underground hole is almost eliminated, the increase of the load can be prevented, and the rolling of the propulsion head body 1A can be prevented.

Further, in the case of correcting the direction by using the propulsion body, as shown in FIG. 3, when the front conductor 3 is applied to the inner wall of the underground hole, the front conductor front forming member 3B is moved to the second position by earth pressure. It swings in the direction of the back side of the inclined pressure receiving surface F2 and inclines with respect to the head main body 1A and the front conductor main body 3A, and the front conductor front portion forming member 3 is formed.
The tip end portion of B is in a state of protruding outward in the radial direction from the outer peripheral portion of the leading conductor body 3A. When the propulsion pipe 2 is pushed in with the inclined pressure receiving surface F facing the side opposite to the side to be swung without rotating the front conductor 3 as described above in that state, the inclined pressure receiving surface F becomes soil. Propulsion head 1 under pressure
The propulsion direction is directed in the direction opposite to the inclined pressure receiving surface F, and the propulsion head 1 turns. In this case, since the front conductor front portion forming member 3B changes its direction in the inclined posture as described above, a small turn can be made and the steering ability can be improved.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a side view showing a tip side of a propulsion head of a propelling body.

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

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

FIG. 4 is a front view of the leading conductor.

FIG. 5 is a plan view of the leading conductor.

[Explanation of symbols]

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

Front page continuation (72) Inventor Mitsuhiko Kamada 1-1-1, Hama, Amagasaki City, Hyogo Prefecture Kubota Technology Development Laboratory Co., Ltd. In the laboratory

Claims (1)

[Claims] 1. A plurality of propulsion pipes (2) are flexibly connected to each other, and a propulsion head (1) for excavating earth and sand is flexibly connected to the propulsion pipe (2) at the tip, and the propulsion is performed. The driving head (1) is replaced by a tubular propulsion head body (1
A), a drive shaft (12) that is fitted into the propulsion head main body (1A) so as to be driven to rotate around the front-rear axis and drive in the propelling direction, and to the tip of the drive shaft (12). A front conductor (3) to be attached, said front conductor (3)
An inclined pressure receiving surface 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 in which the earth pressure is received. (F) is a propelling body for a propulsion method, wherein the inclined pressure receiving surface (F) is a first inclined pressure receiving surface (F) on the base end side.
1) and the second inclined pressure receiving surface (F2) on the tip end side, and the front conductor (3) is divided into the first inclined pressure receiving surface (F1).
And a tongue-shaped front conductor front portion forming member (3B) including the front conductor main body (3A) and the second inclined pressure receiving surface (F2).
And the front conductor front portion forming member (3
B) pivotably connects the front conductor front portion forming member (3B) to the front conductor main body (3A) so that the front conductor front portion can swing freely in the direction of the back side of the second inclined pressure receiving surface (F2). Forming member (3
B) is oscillated in the direction of the back side of the second inclined pressure receiving surface (F2), the tip end portion of the front conductor front portion forming member (3B) is more radial than the outer peripheral portion of the front conductor main body (3A). A propulsion body for a propulsion method in which the front conductor front part forming member (3B) is formed on the outer side so as to be able to protrude.