JP2697758B2 - Connection structure of propulsion body for propulsion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a connecting portion structure of a propulsion body for a propulsion method.

[Conventional technology]

A conventional connecting portion between adjacent propulsion bodies is formed by fitting a small-diameter cylindrical end of the other propulsion body into a cylindrical end of the other propulsion body so that the two propulsion bodies bend. The stopper was merely provided to prevent the part from coming off from the small-diameter cylindrical end.

[Problems to be solved by the invention]

However, in the fitting structure between the cylindrical end portion and the small-diameter cylindrical end portion, in order to make the relative angle at which the two propellants can be bent large, the diameter between the cylindrical end portion and the small-diameter cylindrical end portion must be increased. In such a case, there is a disadvantage that both of them are liable to come off, and that there is a tendency for play to occur in the radial direction.

An object of the present invention is to allow both adjacent propulsion bodies at a connecting portion to be relatively bent at a large angle without rattling.

[Means for solving the problem]

The characteristic configuration of the connecting portion structure of the propulsion body for the propulsion method of the present invention includes a connecting portion for connecting the adjacent propulsion bodies to bend freely, a spherical joint provided on one of the two propulsion bodies, and the other. A rotation receiving means provided on the propulsion body and a fitting receiving part for slidably fitting the spherical joint portion inside the propulsion body, and restricting relative rotation about each axis of the propulsion bodies. To
Formed from a projection and a recess engaged with each other, provided between the fitting receiving portion and the spherical joint portion, so that the projection is allowed to relatively move along the axial direction.
The concave portion is formed to be long along the axial direction, and the projection is arranged on an imaginary line passing through the center of the spherical joint. The operation and effect are as follows.

(Operation)

In other words, the fitting between the spherical joint portion provided on one of the two propulsion bodies and the fitting receiving portion provided on the other allows the two propulsion bodies to slide with each other even if there is not much gap between them. It is possible to bend at an angle, so that earth and sand do not enter the gap between the two propulsion bodies and hinder the bending operation, and do not damage the equipment inside the propulsion body due to the penetrating earth and sand.

In addition, during the bending operation of the two propulsion bodies, the projections engaging with each other move relative to each other in the recess in the axial direction, so that
One propulsion body is swung relative to the other propulsion body in one plane, and the projection is arranged on an imaginary line passing through the center of the spherical joint. The two propulsors are allowed to swing relative to each other (that is, on a plane orthogonal to the rocking surface), thereby enabling the relative bending swing of the two propellants in the three-dimensional direction.

In addition, the relative rotation (rolling) of each propulsion body around each axis is restricted by the rotation restricting means including the projection and the concave portion that engage with each other.

〔The invention's effect〕

Therefore, while the two propulsion bodies are bent at a large relative angle without play, the relative rotation of the two propulsion bodies around the respective axes can be regulated, so that the propulsion bodies can be smoothly propelled in any direction. If the propulsion work can be maintained without trouble due to earth and sand, and the rolling direction between the two propulsion bodies makes it impossible to confirm the planned propulsion direction of the forward propulsion body, or if a rotary excavator is attached to the tip side, The rotation propulsion of the rotary excavator cannot be received by the subsequent propulsion body, which prevents inconveniences such as a decrease in excavation capacity, and ultimately allows the entire propulsion method to be performed efficiently. Was.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 5, a propulsion body (A) having a cylindrical outer surface.
Propulsion head (1) and multiple propulsion tubes (2)
Are preliminarily connected via a connecting portion (J) so as to be freely bent, and press the propulsion pipe (2) while holding the propulsion pipe (2) so as not to bend. In order to make the propulsion head (1) connected to the tip of
A propulsion head (1) for pushing the propulsion pipe (2) into the ground is provided in the construction pit (5), and a propulsion pressing device (3) is provided. A guide member (4) that guides the ground to the ground while maintaining the respective axes of the shafts in a substantially straight line is provided to form a pushing device, and a propulsion pipe (2) is provided above and outside the construction pit (5). ) On which the winding drum (6) is wound is detachably installed to constitute a propulsion device for a propulsion method.

In the drawing, (14) is a support jack for supporting the side wall of the construction pit (5) from the inside, and (15) is a support jack for supporting and pushing the propulsion pipe (2) drawn out from the drum (6). The guide roller guides the member (17).

The propulsion head (1) has a small-diameter head body (1A) of, for example, 50 to 70 mm, and has the same diameter as the head body (1A) and is rotatable around the longitudinal axis (P) with respect to the head body (1A). And a digging part (1B) attached to the tip side.

And the propulsion head (1) is provided in the excavation part (1B).
Pressure receiving surface (F) for receiving the earth pressure along with the underground propulsion and for displacing the propulsion direction of the propulsion head (1) in the direction in which the earth pressure is received, the axial center (P ) Is formed and provided on an inclined surface close to ().

That is, when the propulsion head (1) is moved straight,
When the excavation part (1B) is propelled while rotating with respect to the head main body (1A) and is turned, if the pressure receiving surface (F) is propelled toward the radially opposite side to the side to be turned, The pressure receiving surface (F) receives the earth pressure, and the propulsion direction of the propulsion head (1) is directed to the opposite side to the pressure receiving surface (F).

A connection part (J) between the propulsion bodies (A) and (A), more specifically, a connection part (J) between the propulsion head (1) and the propulsion pipe (2), and a propulsion pipe ( 2) and (2), as shown in FIG. 1 to FIG. 4, the connecting portion (J) is configured as follows.

That is, the joint member (1) is attached to one end of the propulsion body (A).
2) Attach and attach the joint member (12) to the other end of the propulsion body (A) adjacent to one end thereof in a direction orthogonal to the axis (P) of the propulsion body (A). A fitting receiving portion (13) is formed to receive the fitting.

The joint member (12) is provided in a posture along a longitudinal direction of the propulsion body (A), and a shaft portion (12a) formed at a rear portion.
And the spherical joint (1) formed in front of the shaft (12a)
2b). The shaft part (12a) of the joint member (12) is screwed and fixed to the front part of the propulsion pipe (2), and the spherical joint part (12b) of the joint member (12) is the propulsion head (1) or the propulsion pipe. (2) It is swingably fitted inside a fitting receiving part (13) provided at the rear part, that is, at the rear part of the propulsion body (A) located on the tip side.

The fitting receiving portion (13) has a thrust receiving surface (13) for receiving a thrust force for thrust corresponding to a pushing force from behind.
a), a removal receiving surface (13b) for receiving a thrust force for removal corresponding to a pulling force from behind when the propulsion device is removed from the soil is formed.

The receiving surface for propulsion (13a) has a large surface to receive a strong thrust force for propulsion and has a high strength. The receiving surface for retaining (13b) has a weak thrust force for pulling out. Considering that a sufficient clearance between the inner peripheral portion at the rear end of the fitting receiving portion (13) and the shaft portion (12a) is maintained so that the maximum bending angle is not impaired, It is narrower than (13a). That is, in a sectional view passing through the center of the spherical joint portion (12b), the receiving surface for propulsion (13a)
Is positioned closer to the axis (P) than the inner end of the retaining surface for retaining (13b), and the receiving surface for propulsion (13a) is positioned on the receiving surface for retaining. It has a wider surface than (13b).

Between the spherical joint portion (12b) and the fitting receiving portion (13), relative rotation (that is, rolling) around the axis (P) of the adjacent propulsion bodies (A), (A) is restricted. A rotation restricting means (7) is provided.

The rotation restricting means (7) is formed from a projection (7A) and a concave portion (7B) which engage with each other, and a concave portion (7B) is formed in the spherical joint portion (12b), and a fitting receiving portion is formed. Department (1
3) Attach the projection (7A) to the recess (7B) as shown in FIG. 3 so as to allow the projection (7A) to relatively move along the axis (P) direction. The projection (7A) is formed long in the (P) direction, and is arranged on an imaginary line passing through the center (O) of the spherical joint (12b).

The projection (7A) is screwed into a through hole (27) formed in the peripheral wall of the propulsion body (A), and is detachable from the outside.

(28) in the figure is the spherical joint (12b) and the fitting receiving part (13)
Grease injection hole to be injected between the injection hole (28)
Has a removable plug (29) attached to it.

The connecting portion (J) includes a first state in which a bending posture between the propulsion bodies (A) and (A) is allowed, and the propulsion bodies (A) and (A).
A switching means (B) is provided so as to be freely switchable between a protruding body (A) and a second state in which the propelling bodies (A) and (A) are restricted to a posture substantially along the axial direction thereof by prohibiting the bending posture of each other. To constitute the state switching means (B), the connecting portion (J) contacts the ends of the two propulsion bodies (A) and (A) adjacent to each other, and the tension portion (8) maintains the second state. ) To the connecting part (J)
A stopper ring (9) which is slidable in the direction of its axis (P) and which is rotatably fitted around the axis (P). The recess (10) that can be maintained in the first state by the two propulsion bodies (A),
(A) is formed at one front end.

That is, the tension portion (8) in the second state comes into contact with the ends of the adjacent propulsion bodies (A) and (A), respectively, so that the propulsion bodies (A) and (A) are in a bending posture. The strut (8), which is stretched so as not to be bent and fitted into the recessed portion (10) to be in the first state, does not come into contact with each end of the propulsion bodies (A), (A). Tolerate.

The stopper ring (9) has a ball detent (1) protruded inward by a spring (11).
8) is attached, and the ball detent (18) is the first
A first engagement recess (19) engaged when in the state and a second engagement recess (20) engaged in the second state are formed in the connecting portion (J) of the propulsion body (A). The position of the stopper ring (9) is stabilized in each of the first and second states.

On the outer peripheral surface of the stopper ring (9), a finger engaging groove (21) for catching a finger is formed on the entire circumference so that the finger can be easily gripped and operated.

The strut (8) is provided at every 60 ° at three locations in the circumferential direction of the stopper ring (9), and the distance (l) between the ends of both propulsion bodies (A) and (A) is provided. It is formed to the same length as.

(Another embodiment)

The projection (7A) may be attached to the spherical joint (12b), and the recess (7B) may be provided in the fitting receiving part (13).

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

[Brief description of the drawings]

The drawings show an embodiment of the connecting portion structure of the propulsion body for a propulsion method according to the present invention, wherein FIGS. 1 and 2 are action explanatory views showing a longitudinal section of a main part, and FIG. 3 is a plan view showing a partial section. FIG. 4 is an exploded perspective view of a main part, and FIG. 5 is an overall side view. (A) Propelling body (7) Rotation restricting means (7A)
... projection, (7B) ... recess, (12b) ... spherical joint, (1
3) Fitting receiving part, (J) Connecting part, (P) Shaft core, (O) Center.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Katsuhiko Mukai, 1-1-1, Hama, Amagasaki-shi, Hyogo Kubota Iron Works Co., Ltd. (72) Mitsuhiko Kamada 1-1-1, Hama, Amagasaki-shi, Hyogo Kubota Inside Iron & Steel Research Institute (72) Inventor Masaya Hattori 1-1-1, Hama, Amagasaki-shi, Hyogo Prefecture Kubota Iron Works Co., Ltd. (72) Inventor Yukishi Yamada 1-1-1 Hama, Amagasaki-shi, Hyogo Prefecture Kubota Iron Works Co., Ltd.

Claims (1)

(57) [Claims] A spherical portion provided on one of the two propulsion bodies (A), (A) with a connecting portion (J) for connecting the adjacent propulsion bodies (A), (A) to bend freely. Joint part (12b)
And a fitting receiving part (13) provided on the other propulsion body (A) and slidably fitting the spherical joint part (12b) inside. The two propulsion bodies (A), (A) Each axis (P)
A rotation restricting means (7) for restricting relative rotation around the periphery is formed by a projection (7A) and a recess (7B) which engage with each other,
Provided between the fitting receiving portion (13) and the spherical joint portion (12b), the protrusion (7A) is allowed to relatively move along the axis (P) direction. Recess (7B)
Is formed long along the axis (P) direction, and the projection is arranged on an imaginary line passing through the center (O) of the spherical joint portion (12b).