JP3362964B2 - Propulsion body - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a propulsion pipe group in which a plurality of propulsion pipes are arranged in a bendable manner along the longitudinal direction of the propulsion pipe group, and a propulsion head is connected to the tip of the propulsion pipe group. The present invention relates to a propulsion body provided with a leading conductor having an induction slope inclined with respect to the propulsion direction of the propulsion head, at a tip end portion of the propulsion head in a state of being rotatable and driven around an axis of the propulsion head.

[0002]

2. Description of the Related Art Conventionally, in the propulsion construction using this type of propulsion body, the propulsion of the curved propulsion section is performed by setting the posture of the front conductor so that the induction slope of the front conductor faces the outside of the propulsion curve. In general, thrust is applied as it is and construction is carried out.As a result, reaction force from the ground acts on the guide slope to guide the tip of the propulsion head to the inside of the propulsion curve for curved propulsion. You can On the other hand, for the propulsion in the straight propulsion section, after carrying out the above-mentioned curved propulsion procedure for a predetermined propulsion length, the propulsion body is retracted to the extent that a space corresponding to the rotation trajectory of the front conductor can be secured in front of the front conductor in the target ground. , The front conductor is half-turned about the axis of the propulsion head, the guide slope is directed to the opposite side, and then the above-mentioned curved propulsion procedure is used to drive the conductor. It is common to promote. In carrying out such propulsion work, the propulsion body rotates largely around the pipe axis in the target ground (hereinafter,
If it is called "rolling", the posture detection mechanism inside the propulsion head will not be able to grasp the vertical posture around the axis of the propulsion head, and the posture will be grasped by detecting the relative rotation angle with the propulsion head. As for the body,
As long as the posture of the propulsion head cannot be grasped, it becomes impossible to grasp the exact posture around the axis as well, and it becomes difficult to control so that the guide slope faces the predetermined direction.

In order to prevent such problems, the conventional propulsion body is formed by connecting the adjoining propulsion pipes to each other so that they cannot rotate relative to each other around the axis of the pipe. There was a thing which made it difficult to produce the twist in a part.

[0004]

In the rolling of the propulsion body, the reaction caused by the rotation of the above-mentioned conductor and the frictional force of the propulsion body peripheral surface generated between the propulsion body and the target ground during propulsion are nonuniform along the circumferential direction. It is said that this is often caused by a different action distribution, but with the above-described conventional propulsion body, it is possible to prevent adjacent propulsion pipes from relatively rotating relatively to each other around the pipe axis, but It is not possible to prevent rolling that occurs as a whole body.For example, if the entire propulsion body rolls, rotate the root part of the propulsion body located at the propulsion port in the rolling correction direction to rotate the entire propulsion body around its axis. Therefore, the longer the propulsion body extends, the more force must be applied to the rolling correction. Then, when the force exceeds the proof stress of the propulsion body, there is a problem that the rolling correction cannot be finally performed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and provide a propulsion body which can easily correct the attitude around the axis of the propulsion body even if rolling occurs during the propulsion.

[0006]

To achieve this object, the propulsion body of the present invention is characterized in that a plurality of propulsion tubes are flexibly connected continuously along the longitudinal direction thereof in the longitudinal direction of the propulsion tube group. The first propulsion pipe connection portion of the section is formed in a state where adjacent propulsion pipes are relatively rotatable around the pipe axis, and each second propulsion pipe on the tip side of the propulsion pipe group from the first propulsion pipe connection portion. The connecting portion is formed such that the adjacent propulsion pipes are formed so as not to rotate relative to each other around the pipe axis.

In particular, the number of the propulsion pipes connected by each of the second propulsion pipe connecting portions is n, and the number of the propulsion pipes leaves a space in front of the front conductors in the ground to be propelled, which corresponds to the rotation locus of the front conductors. In the state, the driving torque for rotationally driving the leading conductor is T1, and the maximum excavation driving torque when the leading conductor is rotationally driven in a state where the leading conductor penetrates into the ground to be propelled is set as T2. Is defined as r, the head peripheral surface frictional force between the propulsion target ground and the propulsion head peripheral surface is Fh, and the propulsion pipe peripheral surface frictional force between the propulsion target ground and one propulsion pipe peripheral surface is Fp. , (T1 / r-Fh) / Fp <n≤ (T2 / r-Fh)
It is preferable that the relational expression of / Fp is set.

[0008]

According to the characteristic structure of the propulsion body in the present invention, the first propulsion pipe connecting portion in the middle portion in the longitudinal direction of the propulsion pipe group is set such that the adjacent propulsion pipes are relatively rotatable about the pipe axis. Formed, each second propulsion pipe connecting portion on the tip side of the propulsion pipe group from the first propulsion pipe connecting portion, since the adjacent propulsion pipes are formed in a state in which relative rotation is not possible around the pipe axis, With the first propulsion pipe connection part as a boundary, the propulsion pipe group / propulsion head (hereinafter, both of them are collectively referred to as the first propulsion body) before the propulsion pipe group and the rear propulsion pipe are opposed to each other around the pipe axis. It becomes possible to rotate, and, for example, in a state in which the leading conductor is pressed against and supported by the ground to be propelled, the leading conductor is rotationally driven around the axis of the propulsion head to thereby fix the leading conductor to the ground. Is left as it is, but only the first propulsion body is in the opposite direction to the rotation operation direction. It is possible to rotate the. That is, when rolling occurs in the first propulsion body, the first propulsion body in front of the first connecting portion is rotated in the rolling correction direction by performing the rotational driving operation of the lead conductor as described above. It is possible to correct the rolling by returning the propulsion head to a posture around a proper axis. Further, since the rotational driving force at the time of rolling correction needs to be large enough to rotate only the first propulsion body in the ground, the rolling correction can be performed regardless of the propulsion length. Therefore, it becomes possible to carry out the propulsion without having to apply a large rolling correction force as the propulsion length becomes longer as in the conventional case, or the rolling correction cannot be carried out.

Particularly, assuming that the number of the propulsion pipes connected by each of the second propulsion pipe connecting portions is n, the number of the propulsion pipes leaves a space in front of the front conductors in the ground to be propelled, which corresponds to the rotation locus of the front conductors. In the state, the driving torque for rotationally driving the leading conductor is T1, and the maximum excavation driving torque when the leading conductor is rotationally driven in a state where the leading conductor penetrates into the ground to be propelled is set as T2. Is defined as r, the head peripheral surface frictional force between the propulsion target ground and the propulsion head peripheral surface is Fh, and the propulsion pipe peripheral surface frictional force between the propulsion target ground and one propulsion pipe peripheral surface is Fp. , (T1 / r-Fh) / Fp <n≤ (T2 / r-Fh) /
If the relational expression of Fp is set to hold, in the linear propulsion procedure described above, when the propulsion body is retracted and the front conductor is rotated half a turn, the rotational force of the first propulsion body is larger than the rotational driving force. It becomes possible to suppress the rotation of the propulsion head by the frictional force on the circumferential surface, prevent the careless rolling from occurring, and even if the propulsion head rolling occurs due to the propulsion, the above procedure facilitates the rolling. Rolling correction is possible. Therefore, regardless of whether the propulsion line is a straight line or a curved line, rolling correction can be efficiently performed, and highly accurate propulsion work can be performed.

[0010]

Therefore, according to the propulsion body of the present invention, the rolling of the propulsion head can be easily corrected regardless of the size of the propulsion length, and the highly accurate propulsion work can be efficiently performed. Become.

[0011]

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

FIG. 2 shows a propulsion facility S for a propulsion method using an embodiment 1 of the propulsion body of the present invention. The propulsion equipment S for the propulsion method is a horizontal structure in which a propulsion pipe group G in which a plurality of propulsion pipes 2 are flexibly connected continuously along the longitudinal direction via a ball joint J (see FIG. 1) is wound and stored. The mold take-up drum 3 and a propulsion device 4 that holds the propulsion tube group G fed from the take-up drum 3 and presses it in the propulsion direction to propel it into the soil. Also, the propulsion body 1
Is constructed by connecting a propulsion head 5 to the tip of the propulsion tube group G.

The winding drum 3 and the propulsion device 4
Is provided with a crawler 6 separately, and the crawler 6 of the winding drum 3 is provided with a first hydraulic unit 7 for rotating the tip end of the propulsion head 5 and for driving the tip back and forth. A lubricant unit 8 capable of agitating and feeding a lubricant for reducing friction with soil due to the propulsion of the propelling body 1 is mounted.

The crawler 6 of the propulsion device 4 is equipped with a second hydraulic unit 9 for driving the propulsion body 1 by the propulsion device 4 so as to hold and retract the propelling body 1, and also pays out or winds the winding drum 3. A winding operation device 10 for performing a winding operation,
Propulsion operating device 11 for driving and operating the propulsion device 4
A centralized control panel 12 configured to include is installed.

Between the crawlers 6, a cable 13 for electrically connecting the drive portion of the winding drum 3 and the central control panel 12 and a group of propulsion tubes fed from the winding drum 3 are provided. G is arranged in a stretched state.

Explaining the propulsion device 4, there is provided a holding portion 14 capable of holding the propulsion pipe group G, and the holding portion 14 is provided.
A propulsion device main body 15 is provided which is capable of moving the clamping part 14 back and forth along the longitudinal direction of the propulsion pipe 2 in a state of being clamped by a hydraulic drive direction adjusting mechanism 16 capable of adjusting the direction of the propulsion device main body 15. It is provided and configured. Therefore, the propelling body 2 can be propelled in the ground through the guide pipe K provided in the ground by holding the propelling pipe 2 by the holding portion 14 and moving the propelling machine body 15 forward.

The propelling body 1 will be described. As shown in FIG. 1, at the tip of a propulsion pipe group G composed of a plurality of propulsion pipes 2 connected to each other via a ball joint J so as to be bendable in the longitudinal direction, at the tip of the ground. A propulsion head 5 for punching holes is provided, and a hose group extending over the plurality of propulsion tubes 2 and a measurement cable group are internally provided in the inner space.

As shown in the drawing, the propulsion head 5 has a cylindrical head body 5A and an axis T of the head body 5A.
A front conductor 18 that is rotatable around the front conductor 18 and that can move forward and backward in the axial T direction, and a rotation drive mechanism 19 that can rotate the front conductor 18 around the axial T, and similarly in the axial T direction. A retractable drive mechanism 20 that can be driven to move in and out is provided.

The leading conductor 18 is provided with a guiding slope 18a inclined with respect to the propelling direction of the propulsion head 5, and the rotation driving mechanism 19 rotates the leading conductor 18 around the axis T to guide the guiding slope. 18a is oriented in a predetermined direction, and the expansion / contraction drive mechanism 20 causes the front conductor 1 to move.
8 by pushing 8 to the front ground, the guide slope 1
By the earth pressure acting on 8a, it becomes possible to guide the propulsion head 5 in the direction opposite to the direction in which the guide slope 18a is directed, and to perform curved propulsion. The rotation drive mechanism 19 and the extension / contraction drive mechanism 20 are driven by the first hydraulic unit 7 via a group of hoses incorporated in the propulsion body 1.

Further, the head body 5A has a first detection device 21a for detecting a rotation angle of the front conductor 18 around the axis T with respect to the head body 5A, and a rolling angle of the head body 5A. Second detection device 21 for
b is built in, and it is configured to be able to detect whether the guide slope 18a of the leading conductor 18 is oriented in a predetermined direction.

Further, among the respective propulsion pipe connecting portions 22 formed by the ball joint J, the first propulsion pipe connecting portion 22a at the middle portion in the longitudinal direction of the propulsion pipe group G is a pipe between adjacent propulsion pipes 2. Formed in a relatively rotatable state around the axis,
Each second propulsion pipe connecting portion 22b on the tip side of the propulsion pipe group G from the first propulsion pipe connecting portion 22a is provided with a rotation stopping pin N so that adjacent propulsion pipes 2 are arranged around the pipe axis. It is formed so that it cannot rotate relative to it.

Therefore, according to the propulsion unit 1 of this embodiment, in the propulsion of the curved propulsion section, the attitude of the front conductor 18 is set so that the guiding slope 18a of the front conductor 18 faces the outer side of the propulsion curve, and From the propulsion head 5 to the lead conductor 18 in this state
Of the propulsion head 5 can be guided to the inside of the curve and propelled in a curve by projecting the
For the propulsion of the straight propulsion section, after performing the above-mentioned curved propulsion procedure for a predetermined propulsion length, the first conductor 1 in the target ground
8 The front conductor 18 is pulled back to such an extent that a space corresponding to the rotation locus of the front conductor 18 is secured forward, the front conductor 18 is half-turned around the axis T of the propulsion head 5, and then the subsequent propulsion body 1 is propelled. It is possible to implement a meandering linear propulsion by pulling back the front conductor 18 by the expansion and contraction drive mechanism 20 while propelling the same by 4, and repeating the same process. In addition, with such promotion,
When the propulsion head 5 rolls, the leading conductor 1
8 is pressed against the ground to be propelled, and its tip conductor 18 is rotationally driven around the axis T of the propulsion head 5, whereby the tip conductor 18 fixed to the ground is left as it is. It is possible to correct the rolling by rotating only the propulsion pipe 2 and the propulsion head 5 connected by the propulsion pipe connection portion 22b in the direction opposite to the rotational operation direction.
In addition, in rolling correction, the rotation direction and rotation angle are
It can be set from the detection data of both the detection devices 21a and 21b.

Incidentally, assuming that the number of the propulsion pipes 2 connected by each of the second propulsion pipe connecting portions 22b is n, the number of the propulsion pipes 2 is the rotation trajectory of the front conductor 18 in front of the front conductor 18 in the ground to be propelled. Assuming that the driving torque for rotationally driving the tip conductor 18 in a state in which the corresponding space is left is T1, the maximum excavation drive torque when the tip conductor 18 is rotationally driven with the tip conductor 18 penetrating into the ground to be propelled, As T2, the radius of the propulsion head 5 and the propulsion pipe 2 is r, the head peripheral frictional force between the propulsion target ground and the propulsion head 5 peripheral surface is Fh, and the propulsion ground and one propulsion pipe 2 peripheral surface are When the frictional force on the circumferential surface of the propulsion pipe is Fp, (T1 / r-Fh) / Fp <n≤ (T2 / r-Fh)
It is preferable to set it within the range where the relational expression of / Fp is established.
The maximum excavation drive torque means the rotary drive mechanism 1
9 indicates the maximum practical torque at which the lead conductor 18 can be rotated.

For example, T1 = 3 kgf · m, T2 = 6 kgf · m, r = 0.0
In the case of 34 m Fh = 30 kgf and Fp = 15 kgf, n> (3 / 0.034-30) /15=3.8 n ≦ (6 / 0.034-30) /15=9.8, and the second The propulsion pipe 2 connected by the propulsion pipe connecting portion 22b
By setting the number of in the range of 4 to 9,
When the propelling body is retracted and the lead conductor is rotated half a turn, it is possible to secure a supporting force to the extent that the propulsion head 5 does not rotate, prevent rolling from occurring inadvertently, and roll the propulsion head along with propulsion. Even if occurs,
Rolling correction can be easily performed by the above procedure. Therefore, regardless of whether the propulsion line is a straight line or a curved line, rolling correction can be efficiently performed, and highly accurate propulsion can be achieved.

[Other Embodiment] Another embodiment will be described below.

<1> The propulsion head constituting the propulsion body is
The present invention is not limited to the one in which the leading conductor can freely move in and out as described in the previous embodiment, but may be one in which only a mechanism for rotating the leading conductor around the axis P is provided. Also,
The drive source may be something other than hydraulic pressure.

<2> The propulsion pipe connecting portion between the adjoining propulsion pipes is not limited to the ball joint described in the previous embodiment, but may be implemented by other configurations. In short, any structure can be used as long as it can maintain a state in which it can rotate relative to the axis of the propulsion tube and a state in which relative rotation is blocked.

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 configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a propellant body according to an embodiment.

FIG. 2 is a side view showing the propulsion equipment of the embodiment.

[Explanation of symbols]

2 propulsion pipe 5 propulsion head 18 Lead conductor 18a Guide slope 22a First propulsion pipe connection part 22b Second propulsion pipe connection part G propulsion tube group P (propulsion pipe) axis T axis (of the propulsion head)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Togawa 1-1-1, Hama, Amagasaki-shi, Hyogo Inside Kubota Technology Development Laboratory, Inc. (56) Reference JP-A-2-161095 (JP, A) Japanese Unexamined Patent Publication No. 2-256795 (JP, A) Japanese Unexamined Patent Publication No. 2-256797 (JP, A) Japanese Unexamined Patent Publication No. 2-261193 (JP, A) Japanese Unexamined Patent Publication No. 3-176595 (JP, A) , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/06 311 E21B 7/08 E21B 7/26

Claims (2)

(57) [Claims] 1. A propulsion pipe group (G) is provided in which a plurality of propulsion pipes (2) are arranged in a bendable manner along the longitudinal direction of the propulsion pipe group (G), and a propulsion head (5) is provided at the tip of the propulsion pipe group (G). And a lead conductor (18) having an induction slope (18a) inclined with respect to the propulsion direction of the propulsion head (5) can be rotationally driven around the axis (T) of the propulsion head (5). In the propelling body provided at the tip portion of the propulsion head (5) in such a state, the first propulsion pipe connecting portion (22a) at an intermediate portion in the longitudinal direction of the propulsion pipe group (G) is adjacent to the propulsion pipes. (2) Each second propulsion pipe connecting portion is formed such that they are relatively rotatable around the pipe axis (P), and is located on the tip side of the propulsion pipe group (G) from the first propulsion pipe connecting portion (22a). A propulsion body in which (22b) is formed such that adjacent propulsion pipes (2) cannot rotate relative to each other around a pipe axis (P). 2. The number of the propulsion pipes (2) connected by each of the second propulsion pipe connection portions (22b) is n, and the number of the propulsion pipes (2) is in front of the front conductor (18) in the ground to be propelled. Let T1 be the drive torque for rotationally driving the leading conductor (18) while leaving a space corresponding to the rotation trajectory of the body (18).
The radius of the propulsion head (5) and the propulsion pipe (2) is defined as T2, which is the maximum excavation drive torque when the front conductor (18) is rotationally driven in a state where the front conductor (18) penetrates into the ground to be propelled. As r, the head circumferential surface frictional force between the propulsion target ground and the propulsion head (5) peripheral surface is Fh, and the propulsion pipe peripheral surface frictional force between the propulsion target ground and one propulsion pipe (2) peripheral surface is Fp. When (T1 / r-Fh) / Fp <n ≦ (T2 / r-Fh) /
The propulsion body according to claim 1, wherein the relational expression of Fp is set to hold.