JPH0768859B2 - Propulsion device for propulsion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] In the present invention, a plurality of propelling bodies are flexibly connected, and those at the tips of the propelling bodies are inclined with respect to the longitudinal direction of the propelling body. The present invention relates to a propulsion device for a propulsion method in which a pressure receiving surface is formed.

[Conventional technology]

As a method of propelling the propulsion device, a method of pushing the propulsion body from the rear while rotating the portion where the pressure receiving surface is formed around the axis along the longitudinal direction of the propulsion body and linearly propelling it in the soil or In addition, while pushing the propelling body with the direction of the pressure receiving surface fixed at a predetermined position, the direction of the pressure receiving surface is gradually changed by the earth pressure, and the arcuate path in the direction opposite to the direction of the pressure receiving surface in the soil. There is a construction method and so on to follow along.

In the conventional propulsion device for the propulsion method, the maximum bending angle between adjacent propulsion units is maximized from the manufacturing stage so that the propulsion unit can propel in the soil along an arcuate path with a radius as small as possible. It was secured.

[Problems to be Solved by the Invention]

The above-mentioned propulsion device is designed to freely bend as long as each propulsion body is within the range of the maximum bending angle, so for example, when propelling straight in the soil, When it became difficult to propel it against hard soil, the propelling body sometimes inadvertently bent due to the pushing force from the rear. In other words, there is a risk that it will buckle in the soil and cannot propel in the target direction.

Further, the above propulsion device, when propelling the soil along the arcuate path of the minimum radius, when pushing the propulsion body while maintaining the maximum bending angle of the adjacent ones,
The propellant's posture is stable, and it is possible to propel it while drawing a smooth arc, but if you try to propel it in the soil along an arcuate path with a radius larger than that, it will be smaller than the maximum bending angle. Since it is necessary to push the propulsion body at the bending angle, it becomes difficult to maintain the bending angle,
I couldn't propel it while drawing a smooth arc.

Therefore, when propelling in the soil along an arcuate path with a radius larger than the arcuate path with the minimum radius, perform the method of pushing in the propelling body while fixing the direction of the pressure receiving surface at a predetermined position, Occasionally, the propelling body is pushed in while rotating the portion where the pressure receiving surface is formed, whereby the propulsion direction is adjusted and the soil is propelled along a desired arcuate path. However, this construction method requires a lot of skill because it relies heavily on the human sense, and also has the drawback that it cannot be promoted very accurately.

An object of the present invention is to enable a propulsion device to be easily and accurately propelled along a desired path.

[Means for Solving the Problems]

In order to achieve the above object, in the present invention, a plurality of allowable angle adjusting means for changing and adjusting the maximum bending allowable angle of adjacent ones of the plurality of propulsion bodies are provided so as to be changed and adjusted individually. The feature is that there is.

[Action]

When the propulsion device is linearly propelled, the maximum bending allowable angle of the propulsion bodies of adjacent ones is set to 0 degree by the allowable angle adjusting means. Then, the propulsion body is pushed forward while rotating the portion where the pressure receiving surface is formed around the axis along the longitudinal direction of the propulsion body.

Further, when the propulsion device is propelled while turning along an arcuate or elliptic arcuate path having a predetermined radius, when the propulsion bodies of adjacent ones are bent at the maximum bending allowable angle, In addition, the maximum bending allowable angle is preset by each allowable angle adjusting means so that the propulsion body follows an arc corresponding to a predetermined arcuate or elliptic arcuate path. Then, the propelling body is pushed in with the pressure receiving surface oriented so as to receive the pressure in the turning direction. When pushed in this way, the pressure receiving surface receives earth pressure and gradually changes its direction from the leading propelling body, and the propelling body connected to the rear portion thereof bends and follows it. Then, when the bending angle between adjacent ones of the propulsion bodies reaches the maximum allowable bending angle,
The propelling body which cannot be bent any more keeps its bent state and is propelled along a preset arc-shaped or elliptic arc-shaped path.

Further, when the propulsion device is first linearly propelled and then propelled while turning when reaching a predetermined position, the maximum allowable bending angle of the propulsion bodies of the adjacent propelling bodies located on the distal end side is set. When the propelling body is bent at the maximum bending allowance angle, the maximum bending allowance angle is set to allowance angle adjusting means so that the propulsion body follows an arc corresponding to a predetermined arcuate or elliptic arc path. And the maximum bending allowable angle of the propulsion bodies of adjacent ones located on the rear end side is set to 0 degree by the allowable angle adjusting means. And at the beginning,
The portion where the pressure receiving surface is formed is pushed around by rotating around the axis along the longitudinal direction of the propulsion body, and the propulsion body is propelled in a straight line. Then, when the pressure reaches the predetermined position, the direction of the pressure receiving surface is fixed to the position where the pressure is applied in the turning direction, and the propelling body is pushed in. When pushed in this way, from the predetermined position onward, the propulsion body gradually changes its direction when the pressure receiving surface receives earth pressure, and the propulsion body connected to the rear part also reaches the predetermined position. While following the maximum bending allowable angle while bending, it follows along a predetermined arcuate or elliptical arcuate path, but the propelling body behind is propelled straight until it reaches a predetermined position. become.

〔The invention's effect〕

According to the present invention, even in soil that is harder than before, the propulsion device can be linearly propelled without buckling. Further, even in the case of an arcuate path having a radius larger than the conventional arcuate path of the minimum radius or an elliptic arcuate path, the propulsion body is easily and accurately propelled along the arcuate path or the elliptic arcuate path. It has become possible. Furthermore, it is possible to easily and accurately propel even in an irregular case where the propulsion device is first linearly propelled and then propelled while turning when reaching a predetermined position. became.

〔Example〕

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

As shown in FIGS. 2 to 4, a propelling head (1) as a propelling body having an outer cylindrical surface and a plurality of propelling pipes (2) are flexibly connected via a joint (J). The propulsion device for the propulsion method is constructed so that it can be propelled while bending in the soil.

As shown in FIG. 1, the propulsion head (1) is rotatable around a tubular propulsion head body (1A) and an axial center (P) along the longitudinal direction of the propulsion head body (1A). The excavation part (3) and an operating device (4) for rotating the excavation part (3).

The excavation part (3) receives earth pressure as the propulsion pipe (2) is propelled underground, and receives pressure for directing the propulsion direction of the propulsion head (1) in the direction in which the earth pressure is received. Face (F)
Is formed on an inclined surface that intersects the longitudinal direction, and a water injection nozzle (5) is provided for injecting water to weaken the soil on the side of the turning propulsion direction and improve the turning propulsion property.
Although not shown, for example, a weight type sensor is built in the excavation part (3) so that it can detect in which direction the pressure receiving surface (F) is oriented vertically and horizontally. Has become. This detection information is the pressure receiving surface (F).
Used to change the orientation of the.

The operating device (4) is fitted in the propulsion head main body (1A), and the cylindrical hydraulic piston (7) reciprocating with its rotation restricted by the key (6) and the excavating part (3). ) A rotary shaft (8) which is connected to the rear part of the hydraulic piston (7) so as not to rotate relative to the hydraulic piston (7) and has a screw groove into which the hydraulic piston (7) is externally fitted and screwed.
And a pair of pressure oil supply parts (9A) and (9B) for sucking and discharging pressure oil to reciprocate the hydraulic piston (7). A pipe (10) for supplying water to the water injection nozzle (5) is passed through the inside of the rotary shaft (8).
0) is connected to the pressure oil supply section (9A), (9B) 2
Joint part (J) together with two hydraulic pipes (11A) and (11B)
It leads to the rear propulsion pipe (2) through the inside of the.

With this structure, pressure oil is supplied from one pressure oil supply unit (9A or 9B) to the propulsion head main body (1A), and the other pressure oil supply unit (9B or 9A) is supplied from the propulsion head main body (1A). When the pressure oil is returned, the hydraulic piston (7) moves back and forth,
The rotating shaft (8) screwed to the hydraulic piston (7) rotates in the forward and reverse directions, and the excavating part (3) is rotationally driven around the shaft center (P). The excavation part (3) is adapted to rotate at least 360 degrees or more during one reciprocation of the hydraulic piston (7).

By the way, although not described in detail, when the excavation part (3) is rotated in hard soil, the propulsion head main body (1A) tries to rotate in the opposite direction by a reaction force. In order to prevent this, a ridge is provided on the outer peripheral surface of the propulsion head body (1A), or the two hydraulic pipes (11A) and (11B) connected to the propulsion head (1) are made rigid. By doing
It is recommended to prevent the propulsion head body (1A) from rotating.

Next, a joint portion (J) connecting the propulsion head (1) and the propulsion pipe (2), and an allowable angle for changing and adjusting the maximum bending permissible angle between the propulsion head (1) and the propulsion pipe (2). The structure of the adjusting means (S) will be described. Other propulsion pipes (2)
Since the joint portion (J) connecting the two and the allowable angle adjusting means (S) at that portion have the same structure, the description thereof will be omitted.

In the joint portion (J), the front end portion of the propulsion pipe (2) is formed to have a small diameter, and the spherical member (12) is externally fitted and fixed to the small diameter portion (2a). The spherical member (12) is internally fitted to the receiving portion (13) installed in the propulsion head (1), and the receiving portion (13) slides on the outer peripheral surface of the spherical member (12). Thus, the propulsion head (1) has a ball joint structure that can be bent in any of up, down, left, and right directions within a range in which the rear end portion and the front end portion of the propulsion pipe (2) do not contact each other.

Further, in the allowable angle adjusting means (S), a step portion having a small diameter is formed at the rear end portion of the propulsion head (1), and a screw (14) is formed at this step portion. And this screw (14)
And the two lock nuts (15) of the propulsion head (1)
A) and (15B) are screwed together, and two lock nuts (15
By adjusting the positions of A) and (15B), the maximum bending allowable angle of the joint (J) can be set. If these lock nuts (15A) and (15B) are moved forward and fixed, the gap between the propulsion head (1) and the propulsion pipe (2) becomes large, and the maximum bending allowance of the propulsion head (1) is allowed. The corners are set large. On the contrary, if it is moved backward and fixed, the clearance between the propulsion head (1) and the propulsion pipe (2) becomes small, and the maximum bending allowable angle of the propulsion head (1) becomes small (the minimum angle is 0 degree). Will be set.

Next, a propulsion method using the propulsion device having the above structure will be described.

When the propulsion device is moved straight, the maximum bending allowable angle is preset to 0 degree by moving and fixing the lock nuts (15A) and (15B) of each joint (J) to the rearmost part. That is, the joint portion (J) should not be bent. Then, the propulsion pipe (2) is pushed in while rotating the excavation portion (3) with respect to the propulsion head body (1A) (see FIG. 2).

Further, when the propulsion device is turned along an arcuate path having a predetermined radius, the propulsion pipe (2) is moved when each joint (J) is bent at the maximum bending allowable angle. The maximum bending allowable angle is set in advance by adjusting the lock nuts (15A) and (15B) of each joint (J) so as to follow the predetermined arcuate path. Then, the direction of the pressure receiving surface (F) is positioned so as to receive the earth pressure toward the side to be swung, and the propulsion pipe (2)
Push in. By doing this, the soil on the turning direction side is weakened by the water injection nozzle (5), the resistance received from the soil is small, and the pressure receiving surface (F) receives the earth pressure on the turning direction side. The propulsion head (1) gradually changes its orientation in combination with the fact that the propulsion pipe (2) connected to the rear part of the propulsion head (1) bends and follows it. When the bending angle of each joint (J) reaches the maximum allowable bending angle, the propulsion head (1) and the propulsion pipe (2) that cannot be bent any more are set in advance while maintaining the bent state. It will be propelled along the predetermined arcuate path (see FIG. 3).

Further, when the propulsion device is first linearly propelled and then propelled while turning when reaching a predetermined position, the propulsion head (1) and the propulsion pipe (2) located on the tip side are moved. When bent at the maximum bending angle,
Adjust the lock nuts (15A) and (15B) of the joint portion (J) located on the tip side so that the propulsion head (1) and the propulsion pipe (2) follow an arc corresponding to a predetermined arcuate path. Then, the maximum allowable bending angle is set in advance. The maximum allowable bending angle of the joint (J) located on the rear end side is fixed by moving the lock nuts (15A) and (15B) of each joint (J) to the rearmost position and fixing them. Is preset to 0 degree. At the beginning, the propulsion device is propelled in a straight line by pushing the propulsion pipe (2) with the propulsion head main body (1A) at the head while rotating the excavation part (3). When the pressure receiving surface (F) reaches a predetermined position, the direction of the pressure receiving surface (F) is fixed in the turning direction so as to receive pressure, and the propulsion pipe (2) is continuously pushed. When pushed in this way, the propulsion head (1) moves from the predetermined position to the pressure receiving surface (F).
Is gradually changed its direction by receiving earth pressure, and the propulsion pipe (2) connected to its rear part also reaches a predetermined position and follows it while bending at the maximum bending allowable angle, and a predetermined arc-shaped path. Promote along. Then, in the rear end side propulsion pipe (2), the propulsion pipe (2) is propelled straight along the straight path formed previously until it reaches a predetermined position without buckling (see FIG. 4).

Further, in the above-described embodiment, all the joint portions (J) are bent when the propulsion device is turned along the arcuate path, but it is not always necessary to bend all the joint portions (J). . For example, in a soft soil, as shown in FIG. 5, the maximum allowable bending angle of the joint (J) is set to 0 for each two.
It is also possible to use two propulsion pipes (2) as one unit by setting the degree once.

[Another embodiment]

In the previous embodiment, the maximum bending allowable angle is set by moving and adjusting the lock nuts (15A) and (15B) on the screw (14) formed in the step portion. As shown in Fig. 7, screw three bolts (16) from the outer circumference toward the center on the rear part of the propulsion head body (1A),
If the tip of the bolt (16) contacts the outer peripheral surface of the small diameter part (2a) when the joint (J) is bent, the maximum bending can be achieved by adjusting the screw insertion degree of the bolt (16). Allowable angle can be set.

In addition, as shown in Fig. 8, a half spacer (1
If the spacer (17) is externally fitted and the spacer (17) is held by the C ring (18), the maximum bending allowance can be obtained by replacing the spacer (17) with another spacer (17A) having a different length. The corner can be set.

Further, although not shown, each joint part (J) is provided with a permissible angle adjusting means (J) having an actuator, and the maximum bending permissible angle of each joint part (J) is controlled by operating each actuator remotely. It may be set freely in the soil.

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

[Brief description of drawings]

The drawings show an embodiment of a propulsion device for a propulsion method according to the present invention, and FIG. 1 is a vertical sectional side view of a propulsion head and a propulsion pipe.
The figure is a plan view when propelled linearly, FIG. 3 is a plan view when propelled along an arcuate path, and FIG. 4 is first linearly propelled, then along an arcuate path. FIG. 5 is a plan view when propelled, FIG. 5 is a plan view when propelled by two propulsion tubes as one unit, and FIG. 6 is a vertical side view showing a first alternative embodiment of the angle adjusting means. FIG. 7 is a sectional view taken along line VII-VII in FIG. 6, and FIG. 8 is a vertical sectional side view showing a second alternative embodiment of the angle adjusting means. (1), (2) ... Propulsion body, (F) ... Pressure receiving surface, (S)
...... Allowable angle adjustment means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukishige Yamada 1-1-1, Hama, Amagasaki City, Hyogo Prefecture, Kubota Iron Works Co., Ltd. (56) Reference JP-A-59-161596 (JP, A) Kaisho 62-82200 (JP, A)

Claims (1)

[Claims] 1. A plurality of propelling bodies (1), (2) are flexibly connected, and the tip of these propelling bodies (1), (2) receives pressure in the longitudinal direction of the propelling body. A propulsion device for a propulsion method in which a surface (F) is formed, and a plurality of tolerances for changing and adjusting the maximum allowable bending angle of adjacent ones of the plurality of propulsion bodies (1), (2). Angle adjustment means (S)
A propulsion device for the propulsion method in which each is changed and adjustable.