JPH0813980A - Underground propulsion machine - Google Patents

Abstract

PURPOSE:To surely change the advancing direction by connecting a tip diagonal cut head to the tip of a casing surrounding a screw, straightly advancing the casing in the axial direction, and rotating a head via a motion converting means. CONSTITUTION:When the advancing direction of a leading tube 1 is to be changed by 45 deg., for example, a cylinder or the like provided in a vertical shaft is driven to retreat a head 11, and projections P are moved to positions P2 of groove patterns M. When the head 11 is advanced, the direction of the head 11 is changed. When an excavation is conducted in this state, the excavation direction is changed after diagonal cutting. Since the projections P are located at the positions P1 of the grooves M, the rotation angle of the head 11 is maintained as far as the cylinder is not expanded or shrunk. Since the head 11 is rotated in the excavated soil, the required rotating force can be reduced. Since only the longitudinal motion force is applied to a casing 4, the head 11 is not rotated freely, and it can be easily controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground propulsion device in which a pipe is continuously added and buried in the ground without excavating the surface of the ground, and more particularly to an underground propulsion device capable of reliably changing the propulsion direction. .

[0002]

2. Description of the Related Art As an underground propulsion device, for example, Japanese Patent Publication No. 2-
There is one disclosed in Japanese Patent No. This is a screw and a casing that rotatably surrounds the screw,
The casing includes a rotating means for rotating the casing in a circumferential direction and an embedded pipe that rotatably surrounds the casing, and a leading conduit for leading the propulsion of the embedded pipe is integrally connected to a tip of the casing, The leading conduit is rotatably and propulsively fitted to the tip of the buried conduit, and the leading end opening of the leading conduit is formed into a slanted shape so that the leading conduit has a direction correcting function.

The propulsion direction of the above-mentioned obliquely cutting head type underground propulsion device is changed as follows. When it is necessary to grasp the propulsion direction by changing the propulsion direction by grasping the luminous body provided at the inner tip of the screw with a visual scope provided externally, it is necessary to change the propulsion direction. The leading conduit is rotated through the casing by the rotating means so that the direction of the change is (1), which will be the same hereinafter), and after the completion of the rotation, the leading conduit is propelled. In this way, the leading conduit is propelled along the beveled surface and the propelling direction is changed.

[0004]

By the way, in the above-mentioned conventional underground propulsion apparatus, since the rotating means rotates the front conduit through the casing, the harder the soil quality of the ground contacting the front conduit is,
Further, the longer the pipe burying length, the more the casing is twisted, and the following problems occur.

(1) The turning angle of the leading conduit and the turning angle of the turning means differ due to the twisting of the casing, but it is difficult to grasp this difference angle. Therefore, the rotation angle of the rotating means cannot be the rotation angle of the leading conduit. Even when the measuring device is installed in the leading conduit, a measuring device such as a rotary encoder in which the reference point and the measuring point are close to each other cannot be used. Therefore, as in the above-mentioned conventional technique, it is necessary to equip the reference point with the scope and the measuring point with the light emitter. However, in the case of the above-mentioned conventional technique, it is not possible to accurately change how much the rotating means should be rotated to bring the tip end portion to a predetermined position, and therefore the direction of the tip end portion cannot be easily changed. It cannot be said that the propelled direction is correct.

(2) When the leading conduit plunges from a hard soil into a soft soil, the torsional force stored in the casing up to that point is released and the leading conduit is arbitrarily rotated to change the propulsion direction.

The present invention has been made in view of the above problems of the prior art.
It is an object of the present invention to provide an underground propulsion device that can reliably change the propulsion direction.

[0008]

In order to achieve the above object, the present invention is as follows. Note that, in the embodiments, for a plurality of corresponding means displayed, only the reference numerals of typical ones are shown in []. That is, the screw 3, the casing 4 that surrounds the screw 3, the embedded pipe 2 that surrounds the casing 4 that is capable of linear movement in the axial direction, and the head 11 with the tip end surface opened in a slanted manner, and the tip of the screw 3 A head 11 rotatably surrounding the portion and connected to the tip of the casing 4 so as to be rotatable and integrally linearly movable; drive means [56, etc.] for linearly moving the casing 4 in the axial direction; The head 11 moves the linear motion of the casing 4.
Motion converting means [M, P (K, R in the second embodiment), etc.] for converting into the rotational motion of the head and lock means [M, P (second embodiment) for fixing the head 11 at a predetermined rotation angle. L, T), etc.] are provided.

[0009]

According to the present invention, when the casing 4 is moved linearly in the axial direction by the driving means [56, etc.] when the propulsion direction is changed, the movement converting means [M, P (K in the case of the second embodiment, K ,
R) and the like] convert this linear motion into rotational motion of the head 11. When the change of the propulsion direction is completed, the locking means [M,
The head 11 is fixed by P (L, T in the second embodiment).

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment is shown in FIGS. 1 to 6 and a second embodiment is shown in FIG.
~ It demonstrates with reference to FIG. It should be noted that the same members in both embodiments are designated by the same reference numerals, and duplicate description is omitted.

The first embodiment is a front conduit 1 shown in FIG. 1 (a).
The embedded pipe 2, the screw 3, the casing 4, the drive unit 5 shown in FIG. 4, and an external drive force generator and control device (not shown).

The front conduit 1 comprises a front head 11 and a rear shield 12. The front surface of the head 11 is formed in a slanted shape and opens, and the screw 3 is rotatably positioned at the center of the opening. The rear portion of the head 11 is provided so that the head 11 can rotate relative to the casing 4 and can move linearly in the axial direction integrally with the casing 4 (that is, the head 11 can move back and forth; the same applies hereinafter). It is engaged with the tip. Further, on the outer periphery of the rear portion of the head 11, as shown in detail in FIG. 5, groove patterns M of the same shape are continuously engraved at positions shifted by 45 degrees in the circumferential direction. On the inner circumference of the front part of the shield 12, a total of eight protrusions P are fixedly provided at positions shifted by 45 degrees in the circumferential direction, and a stopper 121 and a target 122 are arranged in order toward the rear.
And a stopper 123 are fixed. Each protrusion P is fitted in each groove pattern M so as to be relatively slidable. The embedded pipe 2 is fitted in the rear part of the shield 12 so that the front end face thereof is slidable in the front-rear direction at a position slightly separated from the stopper 123, or abuts on the stopper 123 and is fitted in the rear part of the shield 12. It The buried pipe 2 is a casing 4
It is surrounded so that it can be moved back and forth. The screw 3 is rotatably fitted in the casing 4, and the tip of the screw 3 is located at the center of the opening of the head 11. As described above, in the front portion of the casing 4, the head 11 is rotatably engaged with the rear portion of the head 11, and the stopper 41 is fixedly provided on the rear outer periphery so as to be able to contact the stopper 121.

As shown in FIG. 4, the drive unit 5 is installed in the vertical shaft 6, and the main propulsion cylinder 53 on the base 51 is expanded and contracted so that the propulsion device main body 53 can move back and forth on the rail 54. The main propulsion cylinder 52 is integrally locked to the base 51, and the tip of the rod is integrally engaged with the propulsion device main body 53. The propulsion unit main body 53 has a buried pipe 2 on the front surface thereof.
Removably supporting the reference marks Q1, Q32, Q2
And a camera 55, and a cylinder 56.
Are locked together. A casing 4, a motor 57 for rotating the screw 3, and a sensor 58 for detecting the reference marks Q1, Q32, Q2 as the stroke of the cylinder 56 are integrally provided at the tip of the rod of the cylinder 56. .

The relationship between the groove pattern M and the protrusion P is shown in FIG.
Will be described with reference to. Each groove pattern M includes a longitudinal groove M1 in the front-rear direction and an oblique groove M2. The diagonal groove M2 is formed between two longitudinal grooves M1 and M1 adjacent to each other from the tip of the longitudinal groove M1 on the upper side in the drawing to the longitudinal groove M1 on the lower side in the drawing. These groove patterns M are continuously engraved on the outer surface of the head 11 at positions shifted by 45 degrees in the circumferential direction. Each groove pattern M typically has four positions P1, P2, P.
3 and P32. The position P2 is slightly eccentric to the position PI downward in the drawing. Position P3 is diagonal groove M
2 is provided. The position P32 is provided on the same straight line as shown in FIG. 6 with respect to the position P1, but the front corner is shown in FIG.
Chamfer C is applied as shown in the enlarged view of (b).

That is, when the cylinder 56 is expanded and contracted, the casing 4 connected to the rod moves back and forth. Since the head 11 is engaged with the tip of the casing 4, the head 11 also moves back and forth. At this time, the head 11
As will be described below, the rotational movement is performed in response to this back-and-forth movement.

That is, when the cylinder 56 is contracted to the position where the sensor 58 detects the reference mark Q1 and the head 11 is moved forward, the projection P becomes the position P1. Next, the sensor 58
When the cylinder 56 is extended and the head 11 is moved rearward until the reference mark Q2 is detected by the reference mark Q2, the protrusion P moves to the position P1
To a position P2 through a position P32. At this time, the head 11 is provided so that the position P2 is slightly eccentric with respect to the position P1 in the downward direction in the figure, and therefore the head 11 moves upward in the figure by the amount of the eccentricity (in FIG. 5, the head 11 is viewed from the rear when viewed from the rear side). Rotate around a little). Further sensor 58
When the cylinder 56 is contracted and the head 11 is moved forward until the reference mark Q1 is detected, the protrusion P moves from the position P2 through the position P3 and the oblique groove M2 to the position P1 of the adjacent groove pattern M below in the drawing. Move relatively. That is, the head 11 rotates 45 degrees (in FIG. 5, the head 11 is rotated).
Turns 45 degrees clockwise as seen from the rear).

If the cylinder 56 is continuously rotated by 90 degrees, the cylinder 56 is extended from the reference mark Q1 to the reference mark Q2, then contracted to the reference mark Q32, further extended to the reference mark Q2, and then extended to the reference mark Q1. Just shrink it. The reference marks Q1 and Q3 in this case
It goes without saying that the confirmation of 2, Q2 is performed by the sensor 58 (the same applies hereinafter). Thus, when the head 11 is continuously rotated, the projection P is located at the position P1 only at the beginning and end (that is, the expansion and contraction of the cylinder 56 is performed only at the beginning and end of the reference mark Q).
The cylinder 56 may be expanded and contracted so as to be 1),
In this way, the head 11 can be used for a short time with a small resistance.
Can be rotated.

The wall surface of each groove pattern M has a projection P so that the projection P can easily move back and forth within the groove pattern M.
Has a gradual shape so that it can easily slip relative to each other. Further, the chamfer C at the corner of the position P32 prevents the projection P from sliding into the diagonal groove M2 on the reverse rotation side when the projection P relatively moves from the position P1 to the position P2.

The pipe burying operation according to the first embodiment is shown in FIGS.
Will be described with reference to. FIG. 1A shows a state in which the cylinder 56 is contracted to the reference mark Q1. Therefore, as described above, each protrusion P is located at the position P1 of each groove pattern M, as shown in FIG. Then, excavation (excavation and propulsion) is performed in this state.

The excavation is performed by rotating the screw 3 with the motor 57. On the other hand, propulsion is performed by extending the main propulsion cinder 52 and separating the propulsive force from the propulsion device main body 53 into the following first to third routes. The first route is a route in which the propulsive force propels only the buried pipe 2 through the propulsion device main body 53. In this route, as described above, since the front end face of the buried pipe 2 is slightly separated from the stopper 123, the force pushing the buried pipe 2 is not transmitted to the leading conduit 1. Even a fragile pipe such as a pipe can be buried over a long distance. In the second route, the propulsive force from the propulsion device main body 53 to the cylinder 56 and the casing 4
And a stopper 41 and a stopper 121 in this order to propel the shield 12. The third route is a route for propelling the head 11 from the propulsion device main body 53 through the cylinder 56 and the casing 4 in this order. The screw 3 is also propelled in the second and third routes.

When the buried pipe 2 has a high strength or when the buried distance is short even if the strength is low, the front end surface of the buried pipe 2 is brought into contact with the stopper 123, and the buried pipe 2 and the shield 12 are connected.
And may be promoted together. In this case, the second route is unnecessary (that is, the stoppers 41 and 121 may be omitted).

By the way, when the target 122 is monitored by the camera 55 during the propulsion in FIG. 1 (a), the propulsion direction of the front conduit 1 is clockwise when viewed from the rear as shown in FIG. 3 (a). It is necessary to change to 45 degrees. In this case, first, as shown in FIG. 2A, the cylinder 56 is extended from the reference mark Q1 to the reference mark Q2, the head 11 is retracted, and each protrusion P is formed into each groove pattern as shown in FIG. 2B. M is moved relatively to the position P2, and then the cylinder 56 is contracted to the reference mark Q1.
Move 1 forward. By doing so, the direction of the head 11 becomes the state of FIG. 3A, and when the head 11 is dug in this state, the propulsion direction is changed in accordance with the oblique cutting, as in the conventional technique. The position of each protrusion P at this time is, as shown in FIG. 3B, the position P of each adjacent groove pattern M on the lower side of the drawing.
Since it is 1, the rotation angle of the head 11 is maintained unless the cylinder 56 is expanded and contracted. in this way,
When the propulsion distance reaches the length of the buried pipe 2 by propelling and changing the direction and excavating with the screw 3, the excavation is stopped and a new buried pipe 2 is added in the drive unit 5. And the digging is resumed.

By the way, during the propulsion shown in FIG. 1 (a), if the earth pressure of the ground in front of the head 11 is uniform,
Since the tip end of the head 11 is on the upper side in the drawing, the propulsion direction is upward along the inclined cut surface as the head is dug. Therefore, when excavating in a straight line, it is necessary to rotate the head 11 by 180 degrees so that the tip end is on the lower side and change the propulsion direction. In this case, as described above, the cylinder 56 is extended from the reference mark Q1 to the reference mark Q2, the cylinder 56 is contracted and extended three times between the reference mark Q2 and the reference mark Q32, and finally from the reference mark Q2 to the reference mark Q2. The head 11 can be rotated 180 degrees by contracting the cylinder 56 to the mark Q1. This allows the propulsion direction to be changed downward.

The rotation of the head 11 is performed by retracting the head 11 into the soil already excavated by the screw 3, so that the rotational force is small. Moreover, since the rotational reaction force of the head 11 is received by the earth pressure on the outer periphery of the shield 12, only the force of the longitudinal movement is transmitted to the casing 4.

The above first embodiment may be modified as follows. (1) It is not necessary to limit the number of groove patterns M and protrusions P to eight. For example, they may be 3, 4, 12, 16 or the like. The larger the groove pattern M, the finer the control of the propulsion direction. It is not necessary to provide the projections P in all of the groove patterns M, and for example, three projections P are provided at every 120 degrees, four projections are provided at every 90 degrees, etc. It is desirable to be prepared.

(2) The groove pattern M is reversed (ie,
6A is a groove pattern M viewed from the back side of the paper surface),
The head 11 may be rotated counterclockwise when viewed from the rear. Of course, innumerable groove patterns M themselves can be prepared.

(3) The groove pattern M may be provided on the inner circumference of the shield 12, and the projection P may be provided on the outer circumference of the head 11.

Similarly to the first embodiment, the second embodiment also has a front conduit 1, a buried pipe 2, a screw 3, a casing 4, a drive unit 5 shown in FIG. 9, a driving force (not shown) shown in FIG. It is composed of a generator and a controller.

The front conduit 1 comprises a front head 11 and a rear shield 12. The front surface of the head 11 is formed in a slanted shape and opens, and the screw 3 is rotatably positioned at the center of the opening. The rear part of the head 11 is a cylinder 111 that rotatably surrounds the screw 3, and the head 11 (and the cylinder 111) is rotatably mounted on the rear part of the cylinder 111 with respect to the casing 4. The tip of the casing 4 is engaged. Further, as shown in detail in FIG. 10, the outer surface of the cylindrical body 111 is provided with a roller R which is rotatable about an axis in a direction perpendicular to the axis of the cylindrical body 111. More specifically, as shown in FIG. 11B, one spiral groove K and four longitudinal grooves L are formed in the inner circumference of the shield 12 in the front-rear direction. The roller R is housed in the spiral groove K in a rotatable manner. Each longitudinal groove L is engraved at a position offset by 90 degrees in the inner circumferential direction of the shield 12 and having a length corresponding to one round of the spiral groove K (that is, a length corresponding to 360 degrees), and further each longitudinal groove. The L is provided with nine key grooves L1 to L9 at equal intervals in a comb shape in the circumferential direction. Further, on the inner circumference of the shield 12, a target 122 and a stopper 123 are fixedly provided in this order toward the rear. The buried pipe 2 is internally fitted to the rear part of the shield 12 as in the first embodiment. Screw 3 is cylinder 11
1 and the casing 4 are rotatably fitted therein, and the tip is located at the center of the opening of the head 11. As for the front part of the casing 4, more specifically, as shown in FIG. 12, the head 11 is rotatably engaged with a rear part of the cylindrical body 111 of the head 11 by a swivel joint 112, and more specifically, on the rear outer periphery, As shown in FIG. 11 (a), four keys T are fixedly installed so as to be offset from each other by 90 degrees in the circumferential direction. Each key T is housed in each longitudinal groove L.

As shown in FIG. 9, the drive unit 5 is installed in the vertical shaft 6, and the main body 53 of the propulsion unit can be moved back and forth on the rail 54 by the expansion and contraction of the main propulsion cylinder 52 on the base 51. The main propulsion cylinder 52 is integrally locked to the base 51, and the tip of the rod is integrally engaged with the propulsion device main body 53. The propulsion device main body 53 detachably supports the embedded pipe 2 on the front surface, provides reference marks q1 to q9 in order from the rear at positions corresponding to the installation intervals of the key grooves L1 to L9, and integrally includes a camera 55. Further, the cylinder 56 is integrally locked. The auxiliary propulsion device main body 59 is integrally engaged with the tip of the rod of the cylinder 56. The auxiliary propulsion unit main body 59 includes a casing 4, a motor 571 for rotating the screw 3, and a motor 5 for rotating the casing 4.
72 and a sensor 58 for detecting the reference marks q1 to q9 as strokes of the cylinder 56 are integrally provided.

The pipe burying operation according to the second embodiment will be described with reference to FIGS. 7 and 8. FIG. 7 shows a state in which the cylinder 56 is contracted to the reference mark q1 and the casing 4 is rotated by the motor 572 so that each key T is housed in the last key groove L1 of the longitudinal groove N. Then, excavation (excavation and propulsion) is performed in this state.

The excavation is performed by rotating the screw 3 with the motor 571. On the other hand, in propulsion, the propulsive force obtained by extending the main propulsion cylinder 52 is obtained from the propulsion device main body 53 in the following first to third positions.
It is performed by dividing the route. The first route is a route in which the propulsive force propels only the buried pipe 2 through the propulsion device main body 53. In this route, as described above, since the front end surface of the buried pipe 2 is slightly separated from the stopper 123, the force pushing the buried pipe 2 is not transmitted to the leading conduit 1. By doing so, even a fragile pipe such as a PVC pipe can be buried over a long distance. The second route is a route for propelling the shield 12 from the propulsion device main body 53 through the cylinder 56, the auxiliary propulsion device main body 59, the casing 4, the key T, and the key groove L1 in this order. Third
In the route, the propulsive force is from the propeller main body 53 to the cylinder 56.
Is a route for propelling the head 11 through the sub-propelling machine main body 59, the casing 4, and the swivel joint 112 in this order. The screw 3 is propelled from the propulsion device main body 53 through the cylinder 56 and the sub-propulsion device main body 59 in this order.

At the time of the above propulsion, the target 12 is taken by the camera 55.
As a result of monitoring No. 2, it is assumed that it is necessary to change the propulsion direction of the leading conduit 1 to 180 degrees clockwise as viewed from the rear of the drawing as shown in FIG. If the soil is in the rotating position of 7 and the soil quality is uniform, the propulsion direction will naturally be upward when digging in. Therefore, when digging straight, the head 11 is rotated 180 degrees as shown in FIG. Need to dig)). in this case,
First, the cylinder 56 is moved from the reference mark q1 to the reference mark q5.
Extend the casing 4 forward and then the motor 57
The casing 4 may be rotated by 2 to fit each key T into the key groove L5 of each longitudinal groove N. That is, when the cylinder 56 is extended from the reference mark q1 to the reference mark q5 and the casing 4 is moved forward, the head 11 also moves forward via the swivel joint 112, but the roller R is guided to the spiral groove K following this forward movement. Therefore, the head 11 having the roller R fixed thereto rotates 180 degrees following the spiral groove K. Then, the casing 4 is rotated by the motor 572 to move each key T into each longitudinal groove N.
The head 11 is fixedly maintained in the state of FIG. 3 by being housed in the key groove L5.

As described above, each longitudinal groove L has a length corresponding to one round of the spiral groove K (that is, a length corresponding to 360 degrees), and further, nine key grooves L1 to L9 are circumferentially arranged at equal intervals. Since the helix is provided in a comb shape, the propulsion direction can be fixedly changed over the entire circumference of 360 degrees by 45 degrees. That is, the head 11 is
When the casing 4 is moved forward, it can be rotated clockwise when viewed from the rear of the drawing, and conversely, when the casing 4 is retracted, it can be rotated counterclockwise when viewed from the rear of the drawing, and can be fixed every 45 degrees.

By the way, when the head 11 is retracted and the direction is changed, since the rotation of the head 11 is performed in the soil already excavated by the screw 3, the rotating force is small, but the head 11 is moved forward. When the head 11 is rotated and the direction is corrected, the rotation of the head 11 is carried out in the unexcavated soil, so that the rotational force thereof becomes somewhat large. However, in any case, since the earth pressure on the outer circumference of the shield 12 receives the rotational reaction force of the head 11, the casing 4 needs only the force of the longitudinal movement.

The second embodiment may be modified as follows. (1) The spiral groove K may be reversed. In this case, head 1
1 can be rotated counterclockwise as viewed from the rear side in the figure when the casing 4 is moved forward, and can be rotated clockwise as viewed from the rear side in the figure as the casing 4 is retracted and can be fixed every 45 degrees.

(2) The longitudinal groove N and the key T need not be limited to four.

(3) It is desirable that the number of key grooves of the longitudinal groove N is large. In this way, the propulsion direction can be finely controlled.

(4) The spiral groove K is formed in the cylindrical body 111, and the longitudinal groove N is formed.
May be provided in the casing 4, and the roller R and the key T may be provided in the shield 12.

(5) As shown in FIG. 8, blades 124 in the front-rear direction may be evenly provided on the outer periphery of the shield 12 to give a rotational reaction force to the head 11.

[0041]

As can be understood from the description of the above embodiment, according to the present invention, the linear motion of the casing 4 is converted into the rotary motion of the head 11 by the motion converting mechanism, and then the head 11 is fixed by the locking mechanism. Since it is configured to be maintained at a predetermined angle, the following effects are achieved.

(1) Since the earth pressure on the outer circumference of the shield 12 receives the rotational force of the head 11, only the longitudinal movement force is applied to the casing 4. Therefore, the design condition of the casing 4 becomes easier.

(2) Since the head 11 can be fixed at the lock positions P1 and L1 to L9, the head 11 rotates freely,
Propulsion direction does not change.

(3) Since the lock position, that is, the rotation angle of the head 11 can be accurately grasped by the hands Q1, q1 to q9, the change control of the propulsion direction becomes easy. That is, automation becomes easy

[Brief description of drawings]

FIG. 1 is a diagram showing a propulsion state of the first embodiment, (a)
FIG. 3B is a side sectional view, and FIG. 6B is a diagram showing a relationship between the protrusion and the groove pattern.

2A and 2B are diagrams showing a process of changing a propulsion direction in the first embodiment, wherein FIG. 2A is a side sectional view and FIG. 2B is a diagram showing a relationship between a protrusion and a groove pattern.

3A and 3B are diagrams showing the completion of changing the propulsion direction according to the first embodiment, wherein FIG. 3A is a side sectional view and FIG. 3B is a diagram showing a relationship between a protrusion and a groove pattern.

FIG. 4 is a schematic side view of a drive unit according to the first embodiment.

FIG. 5 is an external view of the head of the first embodiment.

6A and 6B are views of the head of the first embodiment, FIG. 6A is a development view, and FIG. 6B is an enlarged view of part A of FIG.

FIG. 7 is a side sectional view of the second embodiment in a propulsion state.

FIG. 8 is a side sectional view of the second embodiment when the change of the propulsion direction is completed.

FIG. 9 is a schematic side view of a drive unit according to a second embodiment.

10 is a sectional view taken along line BB of FIG.

FIG. 11 is a view showing the relationship between the casing and the shield of the second embodiment, (a) is a partial perspective view of the casing,
(B) is a partial perspective view of the shield.

FIG. 12 is an enlarged view of part D in FIG.

[Explanation of symbols]

3 ... Screw, 4 ... Casing, 2 ... Buried pipe,
11 ... Head 56 ... Drive means (cylinder), M, P, K, R ... Motion conversion means M, P, L, T ... Lock means, M ... Groove pattern, P
・ ・ ・ ・ Protrusion, K ・ ・ ・ ・ Spiral groove R ・ ・ ・ ・ ・ ・ Roller, L ・ ・ ・ ・ Longitudinal groove, T ・ ・ ・ ・ Key

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoji Kasuga 1200 Manda, Hiratsuka-shi, Kanagawa Komatsu Seisakusho Research Laboratory

Claims (1)

[Claims] 1. A screw 3, a casing 4 enclosing the screw 3, an embedded pipe 2 enclosing the casing 4 that can move linearly in the axial direction, and a head 11 having a front end surface opened in a slanted shape. 3, a head 11 that rotatably surrounds the distal end portion of the casing 3 and that is connected to the distal end of the casing 4 so as to be rotatable and integrally linearly movable; drive means for linearly moving the casing 4 in the axial direction; Four
An underground propulsion device comprising: a motion converting means for converting the linear motion of the head into a rotational motion of the head 11; and a locking means for fixing the head 11 at a predetermined rotation angle.