JP3142242B2 - Promotion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to, for example,
Regarding technology for forming an underground hole for laying underground pipes such as cable pipes and water pipes in the ground, more specifically, a propulsion head having a pressure receiving surface portion inclined with respect to the head axis, Using a propulsion body that is configured by providing a plurality of propulsion tubes that are flexibly connected behind the propulsion head,
The present invention relates to a propulsion method in which a thrust is applied to the propulsion body from behind to propelle underground.

[0002]

2. Description of the Related Art A propelling body travels underground while being guided to bend in the direction of action by a ground reaction force acting on a pressure-receiving surface portion during propulsion. As a propulsion method, in advance, the propulsion body is configured so as to be able to bend in any direction.
A method has been adopted in which the pressure receiving surface portion is propelled while being directed to the side opposite to the bending direction. Further, in the straight propulsion unit, the pressure receiving surface portion of the propulsion body is meanderingly propelled by reversing the direction of the pressure every predetermined propulsion cycle, and the propulsion is controlled so as to form a meandering line along a planned straight line. .

[0003]

According to the conventional propulsion method, since the propulsion body is formed so as to be bent in any direction, it can be bent and propelled in any direction. If the heading direction deviates from the direction to which it should be directed, the propulsion body will advance in the direction deviating from the intended bending direction if propelled as it is, and the control of the propulsion direction tends to be complicated. is there. This problem is not only caused by the curved propulsion section, but also by the straight propulsion, because the propulsion body is easily carelessly bent. In addition, control for returning the propulsion route to the planned propulsion line is required each time, and there is a problem that the propulsion work tends to be complicated.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a propulsion method capable of accurately propelling a propulsion body without performing complicated direction control.

[0005]

[Means for Solving the Problems]

[Structure] The characteristic feature of the invention of claim 1 is to provide a propulsion head having a pressure receiving surface portion inclined with respect to the head axis, and a plurality of propulsion tubes connected to the back of the propulsion head so as to be freely bent. In the case of using a propulsion body configured as described above and applying a pressing force to the propulsion body from behind to perform underground propulsion, the propulsion body is configured in advance so that the bending axis of the propulsion pipe is uniaxial. In addition, the pressure receiving surface portion is propelled in a direction along the swing direction of the propulsion pipe around the bending axis.

A second feature of the present invention is to provide a propulsion head having a pressure receiving surface portion inclined with respect to a head axis rotatably attached to a head main body so as to be rotatable around the head axis. A propulsion body having a plurality of bendable propulsion tubes provided behind the propulsion head is used, and when a thrust is applied to the propulsion body from behind to perform underground propulsion, the propulsion is performed in advance. The propulsion body is configured so that the bending axis of the pipe is uniaxial, and in the bending propulsion unit, the pressure receiving surface portion is oriented in a direction along the swing direction of the propulsion pipe around the bending axis. In the straight-moving propulsion part, the pressure receiving surface is propelled in a direction along the bending axis direction.

According to the first aspect of the present invention, the propulsion body is configured in advance so that the bending axis of the propulsion pipe is uniaxial. Is allowed only around the uniaxial bending axis, and can be prevented from being accidentally bent in an unintended direction. And it becomes possible to simplify propulsion direction control. Furthermore, since the pressure receiving surface portion is propelled in a direction along the swing direction of the propulsion pipe around the bending axis, the earth pressure acting on the pressure receiving surface portion efficiently acts on the bending force of the propulsion body. It is possible to do. In other words, the propulsion body can be bent and propelled accurately and efficiently without performing complicated direction control.

According to the characteristic feature of the second aspect of the present invention, the propulsion body is configured so that the bending axis of the propulsion tube is uniaxial in advance, and in the bending propulsion portion, the pressure receiving surface portion is formed by the bending. Since the propulsion is performed in the direction along the swinging direction of the propulsion pipe around the axis, it is easy to prevent the propulsion body from bending in an unexpected direction as in the related art, and the ground reaction force acting on the pressure receiving surface portion As a result, the propulsion body is bent on the opposite side to the direction in which the pressure-receiving surface portion faces and around the bending axis, and can be propelled in a predetermined curve. Further, in the straight running propulsion portion, since the pressure receiving surface portion is propelled in a direction along the bending axis center direction, the action direction of the ground reaction force acting on the pressure receiving surface portion is a surface including the bending axis center. Accordingly, even when a ground reaction force acts on the pressure receiving surface portion, the propulsion body does not bend around the bending axis due to the ground reaction force, and can be propelled more linearly. As a result, the propulsion route is less likely to deviate from the planned propulsion line, and it is not necessary to frequently perform the control for correcting the deviation, thereby enabling accurate and efficient propulsion.

[0009]

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

[First Embodiment] FIG.
As shown in (a drawing showing the connection state of multiple propulsion pipes),
The propulsion head 3 includes a propulsion head 1 having a substantially cylindrical outer surface and a plurality of propulsion pipes 2 connected to the rear of the propulsion head 1. The propulsion main body 3 is spaced apart in its longitudinal direction. A plurality of bent connection portions R1 and a plurality of non-bend connection portions R2.

The propulsion head 1 is, as shown in FIG.
A pressure receiving surface portion F inclined with respect to the head axis P is formed integrally with a closed portion of the tip portion while being formed of a metal cylindrical body. Then, when the pressure receiving surface portion F receives the earth pressure with the propulsion, the propulsion head 1 is guided to the side opposite to the direction in which the pressure receiving surface portion F faces, and changes direction. In the middle part of the propulsion head 1, one of the bent connection portions R1 is provided. The bent connecting portion R1 is formed to be bendable only around a horizontal axis (an example of a bent axis) X along the radial direction of the propulsion main body 3. Further, the pressure receiving surface portion F is formed in a direction orthogonal to the horizontal axis X. At the base end of the propulsion head 1, one of the divided portions 4a of the non-flexible connecting portion R2 is provided.

The propulsion pipe 2 has, for example, a diameter of about 50 m.
m or less of a very small diameter metal cylinder,
At the tip (the front end in the propulsion direction), one split portion 4a of the non-bent portion connecting portion R2 and the other split portion 4b that is detachable are provided. At the base end (the rear end in the propulsion direction) of the propulsion pipe 2, one divided portion 4 a is provided similarly to the propulsion head 1. In addition, the one divided portion 4
By connecting a to the other divided portion 4b, a non-bend connecting portion R2 in a connected state is formed. As shown in the figure, two bent connecting portions R1 are separately provided in the intermediate portion of the propulsion pipe 2. Therefore, the propulsion pipe 2 has two divided sections 4a and 4b formed separately at both ends and three propulsion pipe sections 2a.
And two bent connecting portions R formed between the propulsion pipe portions 2a.
And 1.

The bent connecting portion R1 will be described in more detail. As shown in FIGS. 2 to 8, a cylindrical spherical fitting portion 18 is provided at one end (front end) of one propulsion pipe portion 2a. The spherical fitting portion 18 is attached to the end (rear end) of the other propulsion tube 2a.
Are provided with spherical fitting portions 7 which can be internally fitted and engaged with each other.
8 are fitted together. The spherical fitting portion 1
Reference numeral 8 denotes a tapered cylindrical member (an example of a first cover cylindrical portion).
And a connecting tube 19 which is screwed to the female screw portion 8b of the inner peripheral portion of the cylindrical member 8 and is connected to the one propulsion tube portion 2a. The inner peripheral surface at one end (front end side) is formed in a concave shape along the outer peripheral surface of the spherical fitting portion 7. The outer peripheral surface of the constricted portion of the tubular member 8 is formed in a convex curved surface (spherical surface) centered on the bent core between the two propulsion pipes 2a. This convex curved surface portion is referred to as a curved surface portion 8a (see FIG. 5). And
The end face portion (front end side) of the constricted portion is formed in a flat portion 8d composed of two flat surfaces. Incidentally, the tubular member 8 is configured to cover the bent connection portion R1 with a sliding contact tubular member 17 described later. On the other hand, the spherical fitting portion 7 has, at one end thereof, a male screw portion 7a which can be screwed into the propulsion tube portion 2a in an internally fitted state, and the other end portion has the spherical fitting portion 7a. 1
8 has a spherical portion 7b along the inner peripheral surface at one end (front end side).
Is provided. Then, the spherical fitting portion 7 and the spherical fitting portion 18
Is connected by two pins 9 so as to be able to bend and swing around the horizontal axis X in the fitted state. Note that one end of the pin 9 is almost free from a concave portion 7d formed in a part (two opposing positions) of the outer surface of the spherical fitting portion 7 so that the depth direction is along the horizontal axis X. Inserted without
The other end of the pin 9 has a through screw hole 8e formed in a part of the spherical fitting portion 18 (at two positions corresponding to the concave portion 7d) with a penetrating direction along the horizontal axis X. The horizontal axis X of the bent connection portion R1 is engaged by the engagement based on the insertion of both ends of the pin 9.
As shown in FIG. 6, it is configured such that the surrounding bending and swinging is possible. The two bent connecting portions R1 formed on one propulsion pipe 2 are configured such that their respective horizontal axes X are parallel to each other.

The cylindrical member 8 is attached to the end (rear end) of the propulsion tube 2a on which the spherical fitting portion 7 is screwed.
The sliding contact cylindrical member 17 which is fitted to the outside and covers the bent connecting portion R1 is provided in an extended state. An inner peripheral portion of an end portion (rear end portion) of the sliding contact cylindrical member 17 is brought into sliding contact with the curved surface portion 8a in a state where the cylindrical member 8 and the sliding contact cylindrical member 17 are fitted to each other. A sliding contact portion 10 for closing a gap between the portions 2a is provided. The sliding contact portion 10 is configured to make surface contact with the curved surface portion 8a. On the other hand, as shown in FIG. 5, the outer peripheral portion of the end portion (rear end portion) of the sliding contact cylindrical member 17 is formed to have a tapered shape. With the bending of the bent connecting portion R1, the surrounding soil can be guided to the outside of the pipe along the slope, and the bent connecting portion R
1) Prevents intrusion of soil into the inner space. Further, an end face portion (located inside the sliding contact portion 10) 11 of the propulsion tube portion 2a is formed in a plane, and the spherical fitting portion 18 is bent with the bending around the horizontal axis X. Any one of the two flat portions 8d formed at the end of the protruding portion comes into surface contact with each other to regulate the maximum bending angle between the two propulsion pipe portions 2a. The flat portion 8d and the end surface portion 11 both correspond to an angle regulating opposing portion d, and the facing direction of the angle regulating opposing portion d is set along the longitudinal direction of the propulsion tube portion 2a. Therefore, the propulsion force in the angle-restricted state is transmitted between the propulsion pipe portion 2a by a compression force along the longitudinal direction,
It is possible to efficiently transmit the stress as compared with the one in which the bending force and the shearing force largely act. The flat portion 8d and the end surface portion 11 are referred to as angle restricting means D. on the other hand,
The spherical fitting portion 7, the flat portion 8d, and the end face portion 1
1 is filled with grease G, and from the outside of the bent connection portion R1 to the inner space of the propulsion tube 2, the two propulsion tube portions 2
In addition to preventing soil and groundwater from entering through the boundary between points a, the frictional force accompanying bending is reduced.

The non-flexible connecting portion R2 will be described with reference to FIG.
As shown in FIG. 2, the propulsion body 3 is detachably connected by the meshing integrated portion 12 and can be separated as required (for example, the need arises when the propulsion main body 3 is to be wound up as compactly as possible). It has become. Incidentally, in the meshing integrated portion 12, the meshing state between the convex portion 12a formed on the one divided portion 4a and the concave portion 12b formed on the other divided portion 4b is an external thread. The separable connection is performed by screwing and fixing a female screw body (formed on the one divided portion 4a) 12e to a portion (formed on the other divided portion 4b) 12d. It has become. The convex portion 12a and the concave portion 12b are formed in such a state that their fitting state can be shifted only by 180 degrees around the axis of the propulsion pipe. Therefore, the horizontal axes X of the propulsion pipes 2 connected by the non-flexible connection portion R2 are in a state of being parallel to each other. The projection 12a and the recess 12b constitute a positioning mechanism 13.

As shown in FIG. 1, the propulsion according to the present embodiment, which is carried out by using the above-described propulsion body S, starts from a pit T formed at a starting position in advance and pushes in a pushing device M disposed in the pit T. In the predetermined direction (in the present embodiment,
This means that the propulsion head 1 is positioned so that the pressure receiving surface portion F faces downward when the propulsion body S is first set. When the propulsion pipe 2 is connected to the non-bending connection portion R2, the bending axis of each bending connection portion R1 of the propulsion body S is in a horizontal posture, and is pushed into the ground by the pushing device M.
While the propulsion body S bends obliquely upward, it is possible to easily and speedily perform curve propulsion.

[Second Embodiment] As shown in FIGS. 10 to 12, the propulsion body S has a small diameter (for example, a diameter of 100 mm).
A plurality of propulsion pipes 2 having a small diameter of the order of or less) are connected via a connecting portion R which is capable of bending and swinging around a horizontal axis (an example of a bending axis) X orthogonal to the axial direction of the propulsion pipe 2. The propulsion tube 2 is configured to be connected to a propelling head 1 having a substantially cylindrical outer surface at the foremost portion thereof. In the present embodiment, both the connection portion between the propulsion head 1 and the propulsion tube 2 and the connection portion for connecting the plurality of propulsion tubes 2 to each other are configured by the connection portion R.

The connecting portion R is described in more detail in FIG.
As shown in 11.4, the spherical fitting portion 7 provided at the distal end portion of each propulsion tube 2 and the spherical fitting portion 7 provided at the base end portion of each propulsion tube 2 can be internally fitted and engaged. Are connected by a pin 9 so as to be able to bend and swing around the horizontal axis X. Note that one end of the pin 9 is almost free from a concave portion 7d formed in a part (two opposing positions) of the outer surface of the spherical fitting portion 7 so that the depth direction is along the horizontal axis X. And the other end of the pin 9 is formed in a part of the spherical fitting portion 8 (at two positions corresponding to the concave portion 7d) so that the penetration direction is along the horizontal axis X. FIG. 12 shows that the connecting portion R is bent and swung around the horizontal axis X by the engagement based on the insertion of both ends of the pin 9 into the through screw hole 8e. It has a possible configuration. If the thickness of one end of the pin 9 is changed and one end of the pin 9 is inserted into the recess 7d with a sufficient gap, the connecting portion R
Can perform arbitrary bending and swinging as long as the gap allows. That is, by replacing the pin 9, the connecting portion R
Can be easily changed from a state in which bending and swinging around the horizontal axis X is possible to a state in which arbitrary bending and swinging can be performed.

An intermediate portion of some of the propulsion tubes 2 selected from the plurality of propulsion tubes 2 has a meshing integrated portion (see FIG. 9) 12 similar in configuration to that described in the first embodiment.
Are connected so that they can be separated.

As shown in FIG. 10, the propulsion head 1 is propelled based on a cylindrical head main body 1A constituting the main body thereof and a supply of a driving fluid (specifically, hydraulic oil or a sliding material). A drive shaft 1B fitted inside the head body 1A so as to be rotatable around an axis P of the head (hereinafter simply referred to as a head axis) P, and a leading conductor 1D attached to the tip of the drive shaft 1B. It is composed of The tip conductor 1D
Is formed with a pressure receiving surface portion F inclined with respect to the head axis P, and by rotating the drive shaft 1B, the leading conductor 1D is rotationally driven to an appropriate posture, and the pressure receiving surface portion F is appropriately rotated. Turn in the direction. Then, the propulsion pipe 2 and the propulsion head 1 bend around the horizontal axis X when the pressure receiving surface portion F receives the earth pressure with the propulsion, and the propulsion head 1
Is changing directions. At this time, if the pressure receiving surface portion F is oriented in the direction along the horizontal axis X, the earth pressure acts in a direction intersecting with the horizontal axis X, so that the propulsion body S is propelled straight without bending. It becomes possible. The direction in which the pressure receiving surface portion F faces is not shown in the drawing, but is configured to be detected by a sensor built in the propulsion head 1.

As shown in FIG. 15, the propulsion according to the present embodiment, which is carried out using the above-described propulsion body S, starts from a pit T formed in advance at a start position and pushes in a pushing device M disposed in the pit T. In this case, the propulsion body S is propelled under the ground in a predetermined direction. In the curved propulsion unit, as shown in FIG. Propulsion is performed in the direction (upward or downward) along the swinging direction of the pipe 2, and in the straight traveling propulsion section, as shown in FIG. 13, the pressure receiving surface portion F is moved in the direction along the horizontal axis X direction ( (Lateral direction).

[Another Embodiment] Another embodiment of the present invention will be described below. The bending axis is not limited to the horizontal axis described in the previous embodiment.For example, when performing curve propulsion of a right curve or a left curve in a horizontal plane, the bending axis is a vertical axis. Must be set to

[0023] 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.

[Brief description of the drawings]

FIG. 1 is a side view showing a state of propulsion in a first embodiment.

FIG. 2 is a cross-sectional view of a main part of the propulsion body of the first embodiment as viewed from below.

FIG. 3 is a detailed vertical sectional view of a bending connection portion.

FIG. 4 is a detailed cross-sectional view of a bent connecting portion (or a connecting portion).

FIG. 5 is a sectional view showing a sliding contact portion.

FIG. 6 is an explanatory diagram of an operation of a bending connection portion.

FIG. 7 is an exploded perspective view of a bent connection portion.

FIG. 8 is an exploded perspective view of a bent connection portion.

FIG. 9 is an exploded perspective view showing a meshing integrated portion.

FIG. 10 is a cross-sectional view seen from below showing a main part of the propulsion body of the second embodiment.

FIG. 11 is a detailed vertical sectional view of a connecting portion.

FIG. 12 is an explanatory diagram of an operation of a connecting portion.

FIG. 13 is a top view showing a straight section propulsion state according to the second embodiment.

FIG. 14 is a side view showing a curved part propulsion state of the second embodiment.

FIG. 15 is a side view showing the promotion status of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion head 1A Head main body 2 Propulsion pipe F Pressure receiving surface part P Head axis S Propulsion body X Bending axis

Continuing from the front page (72) Inventor Yukishige Yamada 1-1-1, Hama, Amagasaki-shi, Hyogo Pref. Kubota Technology Development Laboratory Co., Ltd. (56) References JP 7-68860 (JP, B2) (58) Survey Field (Int.Cl. ⁷ , DB name) E21D 9/06 311

Claims (2)

(57) [Claims] 1. A propulsion head (1) having a pressure receiving surface (F) inclined with respect to a head axis (P) is provided.
A propulsion body (S) having a plurality of bendable propulsion tubes (2) provided behind the propulsion head (1) is used, and a pressing force is applied to the propulsion body (S) from behind. A propulsion method for underground propulsion by acting, wherein the propulsion body (S) is configured so that the bending axis (X) of the propulsion pipe (2) is uniaxial in advance, and the pressure receiving surface portion ( F), the propulsion pipe (2) around the bending axis (X).
A propulsion method for propelling in the direction along the rocking direction of 2. A propulsion head having a pressure receiving surface portion (F) inclined with respect to a head axis (P) rotatably mounted on the head body (1A) around the head axis (P). 1) and a propulsion body (S) having a plurality of propulsion pipes (2) arranged to bend freely behind the propulsion head (1) is used. A propulsion method in which a pushing force is applied from behind to the ground to propell underground, wherein the propulsion body (S) is configured in advance so that the bending axis (X) of the propulsion pipe (2) is uniaxial. In the bending propulsion unit, the pressure receiving surface (F) is connected to the bending axis (X).
The propulsion is performed in the direction along the swinging direction of the surrounding propulsion pipe (2), and in the linear propulsion section, the pressure receiving surface section (F)
A propulsion method for propelling in a direction along the bending axis (X) direction.