JP2842575B2 - Propulsion device 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 propulsion device for a propulsion method in which adjacent two propulsion members are connected to each other via a connecting portion so as to be bent.

[0002]

2. Description of the Related Art Heretofore, in such a propulsion device for a propulsion method, the allowable bending angle of a connecting portion is configured to be the same at any connecting portion.

[0003]

However, in the propulsion device for the propulsion method according to the above-mentioned conventional construction, if the allowable bending angle of each connecting portion is set to a small angle,
Since the propulsion device is less likely to buckle during propulsion, it is easier to transmit the propulsion force to the propulsion head and the propulsion performance is improved, but the minimum radius of curvature of the entire propulsion device at the time of bending is large, and There is a disadvantage that the diameter of the drum must be considerably increased in order to smoothly wind the drum with the drum. On the other hand, if the allowable bending angle of each connecting portion is set to a large angle, the entire propulsion device will be reduced. Since the minimum radius of curvature at the time of bending is small, the propulsion device can be easily wound up and the drum diameter can be reduced, but the propulsion device easily buckles during the propulsion operation, and the propulsion force reaches the propulsion head. There was a disadvantage that it was difficult to convey and the propulsion performance was reduced.

That is, in the conventional configuration, it is difficult to achieve both reduction in the diameter of the winding drum and improvement in the propulsion performance.

SUMMARY OF THE INVENTION The present invention provides a propulsion device for a propulsion method in which the above-mentioned conventional disadvantages are solved, the diameter of the winding drum can be reduced, and the propulsion performance can be improved. The purpose is to:

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a bending allowable angle of a part of a first connecting part among a plurality of connecting parts is determined by changing a bending allowable angle of a remaining second connecting part. The first angle is set to be smaller than the allowable angle, the bending state between the propulsion bodies is allowed, and the bending posture between the propulsion bodies is prohibited, and the propulsion body is restricted to a posture substantially along the axial direction. A state switching mechanism that is switchable between the second state and the second state is provided on the second connecting portion, and the operation and effect are as follows.

[0007]

That is, in the above configuration, the allowable bending angle of the second connecting portion is set to an angle allowing the bending at the time of winding, and the allowable bending angle of the first connecting portion is set to the allowable bending angle of the second connecting portion. An angle smaller than the angle is set to allow bending during propulsion, and in that state, during winding, a state switching mechanism provided on the second connecting portion is operated to allow a bending posture between the propulsion bodies.
In this state, the minimum radius of curvature of the propulsion device can be reduced as a whole, and the winding drum having a smaller diameter than the case where the bending allowable angle of each connecting portion is set to an angle that allows bending during propulsion. Thus, the propulsion device can be wound up smoothly.

At the time of propulsion, the state switching mechanism is operated to set the second state in which the bending posture of the propulsion bodies is prohibited.
The propulsion body can be oriented substantially along the axis of the propulsion body around the second connection part. As a result, the propulsion body device is less likely to buckle in addition to the small allowable bending angle of the first connection part. As a result, the propulsion force can be sufficiently transmitted to the propulsion head, and the propulsion performance can be enhanced as compared with the case where the allowable bending angle of each connecting portion is set to an angle that allows bending during propulsion.

[0009]

Accordingly, a propulsion device for a propulsion method can be provided which can simultaneously achieve a reduction in the diameter of the winding drum and an improvement in propulsion performance.

[0010]

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

FIG. 3 shows a propulsion device according to the present invention, ie, a propulsion device in which a propulsion head 1 and a plurality of propulsion pipes 2 # are connected via a connecting portion J to propell the device into the ground. The aircraft is shown with the propulsion device. The propulsion device is specifically configured as described below.

That is, in the construction pit 5, the propulsion pipe 2
A pushing device 3 for pushing the propulsion head 1 for pushing the propulsion pipe 2 # into the soil so as to push the propulsion head 2 connected to the tip thereof into the soil is provided. A guide member 4 for guiding the propulsion pipe 2 # into the soil is provided near the point where the propulsion pipe 2 # is made to penetrate into the soil, while maintaining the axes of the propulsion pipe 2 # substantially in a line. A winding drum 6 for winding and storing the propulsion pipe 2 # is provided outside the upper part of the construction pit 5. Reference numeral 7 denotes a support jack for supporting the side wall of the construction pit 5 from the inside so that the construction pit 5 does not collapse. Reference numeral 9 denotes a guide for supporting the propulsion body B # fed from the winding drum 6 and guiding it to the pressing device 3. It is a roller. Note that the propulsion pipe 2 and the propulsion head 1 are collectively referred to as a propulsion body B.

The propulsion head 1 is, for example, 50 to 70
and a digging portion 1B having the same diameter as the head main body 1A and having the same diameter as the head main body 1A and rotatably attached to the distal end side around the propulsion body axis P (propulsion head axis P) with respect to the head main body 1A. Consists of

The excavation section 1B has a pressure receiving surface F for receiving the earth pressure as the propulsion head 1 is propelled in the ground and for displacing the propulsion direction of the propulsion head 1 in the direction in which the earth pressure is received. Is formed on an inclined surface closer to the axis P toward the tip end. When the propulsion head 1 is moved straight, the excavating portion 1B is propelled while rotating with respect to the head main body 1A, and when the propulsion head 1 is turned, the propelling head 1 is propelled with the pressure receiving surface F facing the side opposite to the side to be turned. The propulsion direction of the propulsion head 1 is directed to the opposite side to the pressure receiving surface F by the earth pressure received by the pressure receiving surface F.

A connecting portion J for connecting adjacent ones of the plurality of propulsion bodies B to bend freely (that is, a connecting portion J for connecting the propulsion head 1 and the propulsion pipe 2 to bend freely, and The connecting portion J) for connecting adjacent ones of the propulsion pipes 2 to bend freely is configured as described in detail below.

That is, as shown in FIG.
In the figure, the connecting portion J between adjacent ones of the propulsion pipes 2 is shown, but the connecting portion J between the propulsion head 1 and the propulsion pipe 2 has the same configuration. in the propellant inner surface of the joint fitting portion B ₄ formed on the end portion B ₂ and B equivalent), the joint member 12 with screwed securing the ends of the propellant B adjacent to the front of the propellant B B ₁ is provided with a fitting receiving portion 13 for receiving the joint member 12 so as to be swingable in a direction perpendicular to the axis P of the propulsion body.

The joint member 12 is provided in a posture along the longitudinal direction of the propulsion body B, and has a shaft portion 12a formed at the rear portion.
And a spherical joint portion 12b formed at a front portion thereof. The shaft portion 12a (more specifically, the male threaded portion formed on the inner surface) to the joint fitting portion B ₄ provided on a front portion of the rear propellant B screwed fixing the fitting to by, or screwed, in addition to the threaded fixing (more particularly, the said joint fitting portion B ₄ the shaft section 12
a), and the spherical joint portion 12b is attached to the rear portion of the front propulsion body B by screwing and fixing using a set screw 23 extending over the front propulsion body B. It is attached to the front propulsion body B side by being swung freely inside the receiving portion 13.

[0018] Incidentally, the shaft portion 12a of the screw to engagement fixed by fitted into the fitting mounting part B _4, and further screwing portion corresponds to the first connecting portion J ₁ to be described later. In its first connecting portion J _1, both the propellant B is connected by it, since B is in the bent freely configured as described below, are fitted into the shaft portion 12a to the joint fitting portion B ₄ Simply fixing by screwing will result in insufficient fixing strength during propulsion,
Wherein in the first connecting portion J _1, it is to be screwed to fit into the shaft portion 12a to the joint fitting portion B _4.

The fitting receiving part 13 is provided with the spherical joint part 12.
The main body portion 13 in which the front side portion b is inserted and removed freely.
b and a lid-like portion 13a detachably attached to the main body portion 13b in a lid-like manner so that the spherical joint portion 12b fitted in and out of the main body portion 13b can not be taken out. Is the main body portion 13b
The male screw formed on the outer periphery of the rear end of the
By screwing a female screw portion formed on the inner peripheral portion on the distal end side of 3a, the lid portion 13a is connected to the main body portion 13b.
The hollow portion 20 for receiving the joint member 12 includes a spherical first hollow portion 20a for the spherical joint portion 12b, and a shaft portion 12
and a second hollow portion 20b having a tapered cylindrical shape with respect to a. By forming the hollow portion with respect to the shaft portion 12a in a tapered cylindrical shape in this manner, both the propulsion bodies B, B at the connecting portion J can be bent freely. In this case, the allowable bending angle of the connecting portion J is equal to the apex angle of the second hollow portion 20b.

The lid portion 13a is originally detachable from the main body portion 13b in order to smoothly fit the spherical joint portion 12b into the fitting receiving portion 13.

As shown in FIG. 1, a part of the plurality of connecting portions J is formed by press-fitting an elastically deformable seal member 10 between opposing end surfaces of the two propulsion bodies B, B adjacent to each other. It is constituted by first connecting portion J _1. Such In the first connecting portion J _1, so that the possible said bent by the elastic deformability of the sealing member 10. In addition, the presence of the seal member 10 prevents foreign matter such as earth and sand from entering.

The outer diameter of the seal member 10 is set smaller than the outer diameter of the propulsion body B by an appropriate dimension. The reason is that the outer diameter of the seal member 10 is appropriately set to a smaller diameter so that the lid 13a of the front propulsion body B and the rear propulsion body B
This is to prevent the seal member 10 from being caught between the front end of the seal member 10 and thereby improve the durability of the seal member 10.

The remaining portion of the plurality of connecting portions J is shown in FIG.
As shown at connecting portions J second connecting portion J ₂ comprises a switching mechanism K which bent posture prohibit first state and the bent posture that allows switching to a second state held straight posture of It is configured.

[0024] The switching mechanism K is specifically is formed by a nut-like stopper 8 that is screwed to the male screw portion formed on an outer peripheral portion of the end portion B ₂ of the rear propellant B. That is, the screwing position is changed in the front-rear direction by rotating the stopper 8, and the switching is performed by adjusting the position. For example, when changing the screwing position of the stopper 8 to the front, the front end portion is adapted to brought into contact with the rear end B ₁ of the front of the propellant B, the second state is achieved by the Setto Become like Conversely, when the screwing position of the stopper 8 is changed rearward (see FIG. 1), the front end of the stopper 8 is separated from the rear end B1 of the forward propulsion body B, and the separation causes the _first end of the second propulsion body B to move away from the front end. One state is realized.

Next, the relationship between the first connecting portion J ₁ and the second connecting portion J ₂ will be described.

As shown in FIGS. 2A and 2B, both connecting portions J ₁ and J ₂ are connected to the first connecting portion J ₁ (or the first connecting portion J ₂ on both sides of the second connecting portion J ₂ ). ₁ and the second connecting portion J ₂ is is arranged so as to be adjacent.

Further, the apex angle of the second hollow portion 20b of the first connecting portion J ₁ and the second connecting portion J ₂ Metropolitan formed respectively 12 ° and 23 °, first bending allowable angle of the connecting portion J ₁ with and it is set to be smaller than the second bending allowable angle of the connecting portion J _2.

In the above configuration, when the state switching mechanism K is switched to the first state at the time of winding of the propulsion device, the minimum radius of curvature of the propulsion device is reduced as shown in FIG. Thus, winding with the winding drum 6 becomes easy.

On the other hand, during propulsion, the state switching mechanism K
When the state is switched to the state, the propulsion device has a large minimum radius of curvature, as shown in FIG. 2B, and assumes a posture substantially along the axial direction, thereby improving the propulsion performance.

The positional relationship between the [Other Embodiment] The first connecting portions J ₁ and the second connecting portion J ₂ is not limited to the above examples,
They may be arranged alternately. Also, if a shorter than the length between the second connecting portion J lengths first and second connecting portions J ₁ between _2, J ₂ adjacent, taken up by the small diameter of the curvature radius at more drum winding. Can be switching mechanism K in the second connecting portion J ₂ is also to implement the present invention in what has become a different configuration from the embodiments described above. For example, the switching mechanism K is突張portion on the rear end portion B ₁ of the front of the propellant B by rotation in a fixed direction is performed (is formed unevenness in the rear end portion) of Setto Then, the second state is realized, and further rotation in the direction (or rotation in the opposite direction) is performed from that state, whereby the contact state of the projecting portion is released (specifically, the manner, the convex portion of the concavo-convex rear portion of the突張portion is retracted into the recess space formed at the front portion B ₂ of the rear propellant B, abutment states of the突張portion is released The present invention can also be implemented with a ring-shaped stopper configured to realize the first state.

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

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a connecting portion structure of a propulsion device according to the present invention.

FIG. 2A is a side view of the propulsion device in a winding state. FIG. 2B is a side view of the propulsion device in a propulsion state.

FIG. 3 is a side view showing a propulsion device for propelling the propulsion device.

[Explanation of symbols]

13a Setto portion B propellant J connecting portion J ₁ first connecting portion J ₂ second coupling portion K state switching mechanism

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaya Hattori 1-1-1, Hama, Amagasaki-shi, Hyogo Inside Kubota Technology Development Laboratory Co., Ltd. (56) References JP-A-2-256797 (JP, A) ( 58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 9/06 311

Claims (1)

(57) [Claims] 1. A propulsion device for a propulsion method in which adjacent two propulsion members (B), (B) are connected to each other via a connection portion (J) in a bendable state. Department (J), ‥
Of the first connecting portion (J ₁ ), the allowable bending angle of the remaining second connecting portion (J ₂ ) is set smaller than the allowable bending angle of the remaining second connecting portion (J ₂ ). A) a state in which the bending postures of the propulsion bodies (B) and (B) are prohibited, and a posture substantially along the axial direction of the propulsion bodies (B) and (B). A propulsion device for a propulsion method, wherein a state switching mechanism (K) that can be switched between a second state and a second state is provided in the second connecting portion (J ₂ ).