JPH0715237B2 - 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 the tip of these propelling bodies is inclined with respect to the longitudinal direction of the propelling body. The present invention relates to a propulsion method of propelling a propulsion device having a pressure receiving surface formed in the ground.

[Prior Art] When propelling the propulsion device while turning it along an arcuate path, set the direction of the pressure receiving surface to receive pressure in the turning direction, and push in the propelling body as it is. Generally, the tip end direction is gradually changed by earth pressure, and the tip is generally propelled in the soil in a direction opposite to the direction of the pressure receiving surface along an arcuate path.

[Problems to be Solved by the Invention]

The shorter the length of each propulsion unit, the more smoothly it can be swung along the arcuate path and propel it.Therefore, in the conventional propulsion device, the length of each propulsion body is changed to the arcuate path with the minimum radius. It's a little shorter to fit.

However, when the soil is soft, the holding force of the propulsion unit is weak, so if the tip hits an obstacle or the like during turning and it becomes difficult to propel, buckling occurs at the connecting part in the middle of the propulsion unit, However, there is a problem that the pushing force from is not reliably transmitted and the vehicle deviates from a predetermined arcuate path and is propelled.

It is an object of the present invention to provide a propulsion method capable of accurately propelling along a desired arcuate path even in a soft soil location.

[Means for Solving the Problems]

In the propulsion method according to the present invention in order to achieve the above object, the length of the propulsion body is made longer when the soil is softer than when the soil is hard, and the propulsion device is propelled. It has a feature.

[Action]

When the propulsion device is swung along an arcuate path and propelled, when the soil is soft and the holding force of the propulsion body is weak, the propulsion device is propelled by making the propulsion body longer than when the soil is hard. Let me do it. When the propulsion body becomes longer in this way, the contact area with the soil between each bent portion increases, so that when pushed in from the rear, it deviates from the predetermined path from the succeeding propulsion body to the rear end portion of the preceding propulsion body. Even if a force is applied in the direction of bending, it is possible to prevent the buckling by exerting a large holding force.

〔The invention's effect〕

According to the present invention, it is possible to accurately propel a propulsion device along a desired arcuate path not only in a hard soil location but also in a soft location.

〔Example〕

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

As shown in FIGS. 2 to 6, a propelling head (1) or a plurality of propelling pipes (2) as a propelling body having an outer surface of a cylindrical surface are flexibly connected via a joint portion (J), As a result, the propulsion device for the propulsion method is constructed so that it can be propelled while bending through the soil between the two joint holes.

As shown in FIG. 1, the propulsion head (1) rotates around an annular propulsion head main body (1A) and an axial center (P) along the longitudinal direction with respect to the propulsion head main body (1A). It consists of a free 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 incorporated inside the excavation part (3), and it is possible to detect in which direction the pressure receiving surface (F) faces up, down, left, right. It is like this. This detection information is used to change the direction of the pressure receiving surface (F).

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 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)
Through the rear propulsion pipe (2).

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 rotary shaft (8) screwed to the hydraulic piston (7) rotates in the forward and reverse directions, and the excavation part (3) is rotationally driven around the shaft core (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 on hard soil, the propulsion head main body (1A) tries to rotate in the opposite direction due to 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 angle adjusting means for changing and adjusting the maximum bending angle between the propulsion head (1) and the propulsion pipe (2). The structure of (S) will be described. Incidentally, a joint portion (J) connecting the other propulsion pipes (2) and an angle adjusting means (S) for the joint portion (J).
Since it has the same structure, the explanation is 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 the 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 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 the step portion. And, to this screw (14), two lock nuts (15A), (15
B) are screwed together and two lock nuts (15A), (15
The structure is such that the maximum bending angle of the joint (J) can be set by adjusting the position of B). 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,
The maximum bending angle of the propulsion head (1) is set to be large.
On the contrary, if it is moved backward and fixed, the gap between the propulsion head (1) and the propulsion pipe (2) becomes smaller, and the maximum bending angle of the propulsion head (1) becomes smaller (the minimum angle is 0 degree). When it is done, it becomes.

Next, a basic propulsion method when the propulsion device having the above-described structure is used in a hard soil site will be described.

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

Further, when the propulsion device is turned along an arcuate path having a predetermined radius, the propulsion pipe (2) is moved to a predetermined position when each joint (J) is bent at the maximum bending angle. The maximum bending angle is set in advance by adjusting the lock nuts (15A) and (15B) of each joint (J) so as to follow the arcuate path. Then, the direction of the pressure receiving surface (F) is positioned so as to receive the earth pressure on the side to be swung, and the propulsion pipe (2) is pushed 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 bending angle, the propulsion head (1) can no longer bend.
The propelling pipe (2) is propelled along a predetermined arcuate path set in advance while maintaining its bent state (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 being bent at the maximum bending angle, the propulsion head (1) and the propulsion pipe (2) are located on the tip end side along an arc corresponding to a predetermined arc-shaped or elliptic arc-shaped path. Adjust the lock nuts (15A) and (15B) of the joint (J) to set the maximum bending angle in advance. In addition, the maximum bending angle of the joint portion (J) located on the rear end side is determined by each joint portion (J).
The maximum bending angle is preset to 0 degree by moving the lock nuts (15A) and (15B) of (1) to the rearmost position and fixing them.
Then, first, 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).
Gradually changes its direction when it receives earth pressure, and the propulsion pipe (2) connected to the rear part also reaches the predetermined position and bends at the maximum bending angle, following it and following the predetermined arc-shaped path. Promote along. And the rear end side propulsion pipe (2)
Then, the vehicle is propelled in a straight line along the straight path formed previously until it reaches a predetermined position without buckling (see FIG. 4).

The above is the propulsion method when the propulsion device is used in a hard soil location, but it is basically the same when it is used in a soft soil location. However, even if the soil is soft, if obstacles or hard soil are mixed in the route and the propulsion head (1) hits it and it becomes difficult to propel it, as shown in FIG. There is a possibility that the bending portion (J) in the middle may be bent by the pushing force from the rear. Therefore, in this case, the maximum bending angle of the bent portion (J) is set to be 0 degrees for every other one, so that two propulsion pipes (2) are integrally connected and two propulsion pipes (2) are connected. 1 unit. In this way, after increasing the holding power of the propulsion pipe (2) in the soil,
The propulsion device is propelled (see Fig. 6).

[Another embodiment]

In order to carry out the present invention, three or more propulsion pipes (2) are integrally connected so that the propulsion device is propelled after the propulsion pipes (2) are made into one unit with three or more propulsion pipes (2). You may

It should be noted that reference numerals are given for convenience of contrast with the drawings in the claims, 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 method according to the present invention. Fig. 1 is a vertical sectional side view of a propulsion head and a front portion of a propulsion pipe, and Fig. 2 is a plan view of a case where a propulsion device is linearly propelled. FIG. 3 is a plan view of the propulsion device propelled along an arcuate path,
FIG. 4 is a plan view in which the propulsion device is first linearly propelled and then propelled along an arcuate path, and FIG. 5 is a plan view showing a state in which the bent portion of the propulsion device is buckled. FIG. 6 is a plan view of the propulsion device propelled along an arcuate path in soft soil. (1), (2) ... Propulsion body, (F) ... Pressure receiving surface.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yukishige Yamada 1-1-1, Hama, Amagasaki City, Hyogo Prefecture, Kubota Iron Works Co., Ltd. (56) Reference JP-A-2-161094 (JP, A) Kaisho 59-161596 (JP, A)

Claims (1)

[Claims] 1. A plurality of propelling bodies (1), (2) are flexibly connected, and those at the tips of the propelling bodies (1), (2) are in the longitudinal direction of the propelling body. A propulsion method in which a propulsion device having an inclined pressure receiving surface (F) is propelled into the soil, and the length of the propulsion bodies (1) and (2) is set to be longer than that when the soil quality is hard. A propulsion method in which the propulsion device is propelled by lengthening it when it is soft.