JP2637692B2 - Underground propulsion device and underground propulsion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground propulsion apparatus and an underground propulsion method which can be effectively applied to a wide variety of grounds.

[0002]

2. Description of the Related Art The mechanical propulsion method is a method in which ground is excavated by excavating means driven in front of a propulsion pipe, and the propulsion pipe is pressed into the ground from behind by a propulsion device. The excavated soil and the like are transported by fluid using water pressure, air pressure, or the like, or are discharged using a soil discharging mechanism provided in the propulsion pipe.

[0003] The drilling bit or drilling method used in the machine propulsion method is properly used depending on the soil to be drilled. A cutting type drill bit is generally used for the ground which is relatively easy to dig such as ordinary soil or soil mixed with cobblestone.

[0004] Since it is necessary to cut or crush the object on the ground or the bedrock containing the gravels or large gravels, a wedge-shaped disc-shaped bit is pressed against the object and divided into small pieces. And a crushing type drill bit for crushing an object by chipping of a carbide bit.

In addition to the above excavation methods, there are an impact type in which an object is crushed by an air hammer, and a compound type excavation method in which two or more types of the excavation methods are combined. Each method has advantages and disadvantages, and must be properly used in consideration of the properties of the object.

[0006]

The ground to be excavated by the propulsion method is generally not uniform in many cases. For example, the ground changes from ground containing large gravel to rock or from rock to ordinary soil. These soils are not uniform in hardness and other properties, and it has been difficult to excavate all the grounds efficiently and with high accuracy using only a single type of drill bit. Therefore, every time the target soil changes, it is necessary to replace it with a drill bit that matches the soil conditions.

[0007] Ground or hard rock containing huge gravel is the most difficult object of the propulsion method, and when excavating, the huge gravel or rock is crushed or crushed to a size that can be discharged from the propulsion pipe. There is a need. Although there are drill bits suitable for drilling such massive gravel and rock, their service life is naturally limited. Therefore, even when the target soil does not change, when excavating the ground including the huge gravels, the hard rock, or the like, the excavation bits must be replaced on the way to promote a particularly long section.

In the propulsion method, the drilling efficiency of the drill bit and the propulsion force are closely related. Excessive propulsion promotes wear and loss of the drill bit, shortens the service life of the bit, and improves the propulsion accuracy. Lower. With too little propulsion, the original capacity of the drill bit cannot be exhibited, and the drilling efficiency is significantly reduced.

Therefore, if the object to be excavated is a gravel layer or a bedrock as described above, the propulsion force must be determined so that appropriate stress suitable for the excavation is transmitted to the excavation bit.
With the conventional underground propulsion device, the stress actually applied to the face by the excavation bit cannot be correctly determined. When the propulsion pipe is propelled to some extent, the propulsion force applied to the propulsion pipe by the propulsion device is attenuated by frictional resistance around the propulsion pipe and frictional resistance due to bending of the propulsion pipe. Accordingly, the propulsive force of the jack of the propulsion device at the base end of the propulsion pipe does not always match the stress applied to the drill bit at the tip of the propulsion pipe.

Conventionally, when the propulsion speed of the propulsion pipe is reduced, the propulsion force of the propulsion device is increased until a desired propulsion amount is obtained. Since the stress actually applied to the drill bit was not accurately grasped, the stress applied to the drill bit may be excessive, and in such a case, the direction of the progress / promotion of breakage / wear of the drill bit This led to an increase in the error.

The present invention has been made in view of the above-mentioned conventional difficulties, and allows excavating bits to be replaced as needed during propulsion, while accurately grasping the stress applied to the excavating bits to improve the propulsion accuracy and precision. An object of the present invention is to provide an underground propulsion device and an underground propulsion method capable of performing propulsion with high propulsion efficiency.

[0012]

[0013]

According to a first aspect of the present invention, there is provided an underground propulsion device, wherein a propulsion pipe press-fitted into the ground, an inner pipe inserted into the propulsion pipe and rotated, and a propulsion pipe provided at a tip end of the inner pipe. A first tubular tube coaxially provided with the first tubular tube so as to be movable within a predetermined range in an axial direction, and a first tubular tube rotating integrally with the first tubular tube in the propulsion tube in a circumferential direction. The second tube and the second tube
It is provided at the tip of the cylindrical pipe so as to be able to swing, is set to the excavation position where it is pressed by the tip of the first cylindrical pipe moved in the axial direction and excavates in front of the propulsion pipe, and the excavation bit It is characterized in that it has a drill bit that is drawn into the storage position inside the propulsion pipe by pulling in the inner pipe at the time of replacement.

[0015] underground propulsion apparatus according to claim 2, that the ground propulsion apparatus according to claim 1, provided with means for injecting water into the drill bit from the tip portion of the second cylindrical tube It is characterized by.

The ground propulsion apparatus according to claim 3 is the ground propulsion device according to claim 1, wherein it is characterized in that said drill bits are圧裂type bits.

According to a fourth aspect of the present invention, there is provided an underground propulsion apparatus according to the third aspect , wherein a crushing bit is fixedly provided at a tip end of the second cylindrical pipe. I have.

According to a fifth aspect of the present invention, there is provided an underground propulsion method comprising: a propulsion pipe press-fitted into the ground; an inner pipe inserted into the propulsion pipe and rotating; and a propulsion pipe provided at a tip end of the inner pipe. A first tubular tube coaxially provided with the first tubular tube so as to be movable within a predetermined range in an axial direction, and a first tubular tube rotating integrally with the first tubular tube in the propulsion tube in a circumferential direction. The second tube and the second tube
It is provided at the tip of the cylindrical pipe so as to be able to swing, is set to the excavation position where it is pressed by the tip of the first cylindrical pipe moved in the axial direction and excavates in front of the propulsion pipe, and the excavation bit At the time of replacement, a drill bit is drawn into the storage position inside the propulsion pipe by pulling in the inner pipe, a base, and movably provided with respect to the base. A propulsion means for applying a propulsive force to the pipe; and a driving means provided movably with respect to the base for applying a rotational force to the inner pipe and pressed by the propulsion means. .

According to a sixth aspect of the present invention, there is provided an underground propulsion apparatus according to the fifth aspect , further comprising pressure detection means for detecting a thrust at a tip of the excavation bit.

According to a seventh aspect of the present invention, in the underground propulsion method using the underground propulsion device according to the first aspect , excavation is stopped during excavation and the inner pipe is moved in the opposite direction to the propulsion direction. The drill bit is pulled back into the propulsion pipe, pulled out from the rear end of the propulsion pipe together with the inner pipe, exchanged, and then reinserted into the propulsion pipe to resume excavation.

The underground propulsion method according to an eighth aspect of the present invention is the underground propulsion method using the underground propulsion device according to the sixth aspect , wherein the value of the stress at the tip end of the excavation bit detected by the pressure detection means is reduced. Accordingly, the excavation is stopped during the excavation, the inner pipe is pulled back in the direction opposite to the propulsion direction, the drill bit is drawn into the propulsion pipe, pulled out from the rear end of the propulsion pipe together with the inner pipe, replaced, and then propelled again. It is characterized by being inserted into a pipe and restarting excavation.

[0022]

The propulsion means propells the propulsion pipe, and the driving means rotates the inner pipe. Since the driving means is pressed by the propulsion means, the inner pipe is also propelled in the same direction as the propulsion pipe. The first tube connected to the inner tube moves axially with respect to the second tube. The excavation bit provided on the second cylindrical pipe is pressed by the first cylindrical pipe and set at the excavation position in front of the propulsion pipe.

When excavating bits are exchanged during propulsion, propulsion is stopped and the inner pipe is pulled out. The first tube moves relatively backward with respect to the second tube, and the pressing and fixing of the drill bit by the first tube is released. The drill bit is set in the storage position and is drawn into the propulsion pipe. After excavation bit replacement, insert the inner pipe again into the propulsion pipe.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An underground propulsion device and an underground propulsion method according to an embodiment will be described with reference to FIGS. The underground propulsion device 1 includes a propulsion pipe 2 that is pressed into the ground, an inner pipe 3 that is inserted into the propulsion pipe 2 and rotates, and a front end of the propulsion pipe 2 that is attached to a tip of the inner pipe 3. And a propulsion device 5 which is a drive unit of the present device.
The propulsion device 5 presses the propulsion pipe 2 to press it into the ground, and rotates the inner pipe 3 to
It is equipped with a function to excavate the ground.

First, referring to FIGS. 1 to 8, the structure near the distal ends of the propulsion pipe 2 and the inner pipe 3 where excavation is performed will be described. As shown in FIGS. 1 to 4, a leading pipe 6 is attached to the tip of the propulsion pipe 2. As shown in FIGS. 1 and 7, the center of the inner diameter and the center of the outer diameter of the front conduit 6 are eccentric, and therefore, the wall thickness of the tube wall of the front conduit 6 is not constant. The part with the largest thickness and the part with the smallest thickness are located 180 ° apart in the circumferential direction of the tube. A locking portion 7 protruding inward is formed in a circumferential shape on an inner peripheral portion of the front end of the front conduit 6.

The leading pipe 6 has an outer diameter slightly larger than the outer diameter of the propulsion pipe 2. Connection of both pipes having different outer diameters is performed as follows. That is, the bus line of the front pipe 6 at the maximum thickness point of the front pipe 6 does not protrude outward than the bus bar of the outer peripheral surface of the propulsion pipe 2 connected to this portion, and is parallel to the center line of the propulsion pipe 2. To do. In addition, the generatrix of the leading conduit 6 at the minimum thickness point is located at a position slightly protruding outward from the generatrix of the outer peripheral surface of the propulsion pipe 2 connected to this portion.
Here, the generatrix is located in the peripheral surface of the cylindrical member, and
It means a straight line parallel to the central axis of the cylindrical member.

An inner pipe 3 is inserted into the propulsion pipe 2. An excavation body 8 is attached to a tip of the inner pipe 3. The excavated body 8 constitutes a propulsion conductor 9 of the underground propulsion device 1 together with the tip conduit 6. The excavated body 8 is inserted into the front conduit 6 and rotates eccentrically, and overcuts a part of the front conduit 6 in the outer peripheral direction when excavating the ground.

The excavated body 8 includes a pipe 10 attached to the tip of the inner pipe 3 and a first section provided at the tip of the pipe 10.
A cylindrical tube portion comprising an inner cylindrical tube 11 which is a cylindrical tube and an outer cylindrical tube 12 which is a second cylindrical tube for extrapolating the inner cylindrical tube 11, and provided at a tip of the outer cylindrical tube 12 of the cylindrical tube portion. The drill bit 4 is provided. On the outer peripheral surface of the inner tube 11 and the inner peripheral surface of the outer tube 12,
A spline-like groove and a ridge parallel to the central axis direction are formed, and these are engaged with each other. A step portion 12a is provided at a front end portion of the outer tube 12, and an annular stopper member 12b is provided at a rear end portion. Between the step 12a and the stopper member 12b, the inner tube 1
The projections and grooves of the outer tube 1 and the outer tube 1 are engaged with each other.
The lengths of the ridges and grooves of the outer tube 12 are longer than the lengths of the ridges and grooves of the inner tube 11 by the dimension L1. Accordingly, as shown in FIGS. 3 and 4, the inner tube 11 and the outer tube 12 can slide with respect to each other by the dimension L1 in the central axis direction.

However, the distal end of the outer tube 12 comes into contact with the locking portion 7 of the front pipe 6 so as not to go outside, so that the excavated body 8 does not protrude forward of the front pipe 6 more than necessary. It is configured. Accordingly, when the inner pipe 3 is moved in the direction of the central axis, the outer pipe 12 is fixed to the locking portion 7 of the front pipe 6, and the inner pipe 11 moves with respect to the outer pipe 12.

A plurality of mounting members 13 are fixed to the front end surface of the outer tube 12 at predetermined intervals in the circumferential direction. The drill bit 4 is provided between the mounting members 13 via a hinge 14 so as to be swingable. A holding plate 15 is fixed to the front surface of the mounting member 13 to which the excavation bit 4 is attached by a fixing means such as a bolt, so that the excavation bit 4 is not detached from the mounting member 13.

Accordingly, each excavation bit 4 has a position (storage position) shown in FIG. 3 where the tip end thereof substantially coincides with the extended surface of the outer peripheral surface of the outer cylindrical tube 12 of the excavated body 8 and the outer cylindrical tube 12. It is configured so that it can be opened and closed between a position (excavation position) shown in FIG.

The opening and closing of the excavating bit 4 is performed by the inner tube 11 and the outer tube 12 of the excavated body 8. First, as shown in FIGS. 2 and 4, when the inner tube 11 of the excavated body 8 is pushed to the front position, the excavation bit 4 is pushed at the rear end by the tip of the inner tube 11 to move outward. Open to
The distal end portion is fixed at the excavation position where it projects outside the outer peripheral surface of the outer tube 12.

Next, as shown in FIG. 1 and FIG. 3, when the inner tube 11 of the excavated body 8 is pulled to the rear position, the excavated bit 4 falls forward and its tip end is Outer tube 12
It comes to the storage position almost coincident with the extended surface of the outer peripheral surface.

Then, if the inner tube 3 is pulled backward as it is,
The entire excavation body 8 including the excavation bit 4 can be pulled backward from the leading conduit 6. According to the structure of the propulsion conductor 9 in this embodiment, the inner pipe 11 and the outer pipe 12
Has a spline structure, the inner tube 11 and the outer tube 12 are slidable in the central axis direction, and the drill bit 4 can be opened and closed between the drill position and the storage position. During excavation, the excavation bit 4 may be worn out. In such a case, the excavation bit 4 needs to be replaced. However, the spline structure of the inner tube 11 and the outer tube 12 as in the present embodiment is required. According to this, it is possible to pull out and replace the excavation bit 4 even during excavation. Further, since the inner tube 11 and the outer tube 12 are engaged in the rotation direction and rotate integrally,
The rotational force applied to the inner tube 3 is changed from the inner tube 11 to the outer tube 12.
And the drill bit 4 is rotated.

When the excavation bit 4 shown in FIGS. 2 and 4 is opened, the tip of the excavation bit 4 is aligned with the outer peripheral surface of the tip conduit 6 at the portion where the wall thickness of the tip conduit 6 is maximum. Although the ground is not overcut, the tip portion projects outward from the outer peripheral surface of the front conduit 6 to overcut the ground at a portion where the wall thickness is minimum.

That is, as shown in FIGS. 7 and 8, the center point of the inner peripheral surface is eccentric with respect to the center point of the outer peripheral surface of the leading conduit 6, and the drill bit 4 rotating along the inner peripheral surface is eccentric. Is eccentric with respect to the outer peripheral surface. Therefore, if the radius of the outer trajectory 16 of the drill bit 4 is the same as the dimension obtained by adding the radius of the outer diameter of the leading conduit 6 and the amount of eccentricity δ, as shown in FIG. A portion to be overcut by the drill bit 4 and a portion not to be cut are formed around the tip conduit 6. As described above, the eccentric overcut is performed in the propulsion conductor 9 of the propulsion device 5 and the press-cut resistance is reduced on the overcut side. Therefore, as shown by an arrow in FIG.
Will be corrected toward the overcut side.

Next, as shown in FIGS. 7 and 8, two pressing plates 20 are provided on the outer peripheral surface of the leading conduit 6. The pressing plate 20 is a plate material having a curved shape along the outer peripheral surface of the front conduit 6, and protrudes outward from the outer peripheral surface of the front conduit 6 by the thickness thereof.

The mounting position of the pressing plate 20 with respect to the leading conduit 6 is as shown in FIG. That is,
The position on the outer peripheral surface of the front conduit 6 is defined by the front conduit 6 passing through the position.
If the center angle between the radius of the outer peripheral surface and the radius passing through the maximum thickness point is expressed as a central angle, it is measured clockwise from the radius passing through the maximum thickness point and is less than 90 ° from the 45 ° position. There is one pressing plate 20 between the positions. The other pressing plate 20 is
It is between the position exceeding 0 ° and the position of 315 °. The two pressing plates 20 are provided at positions symmetrical to each other with respect to the diameter connecting the maximum thickness point and the minimum thickness point of the front conduit 6, and are located closer to the maximum thickness point side when viewed from the front.

Since resistance is applied to the pressing plate 20 on the outer peripheral surface of the front conduit 6 from the ground during propulsion, the front conduit 6 receives a pressing force in a direction where the pressing plate 20 is not provided as shown in FIG. 8 is corrected as indicated by the arrow in FIG. Correction of the propulsion direction by the pressing plate 20 coincides with the direction correction by the eccentric excavation of the excavation bit 4 described above. That is, the overcut of the excavation bit 4 is on the side of the minimum thickness point of the front pipe 6, and the pressing plate 20 is provided near the maximum thickness point. Therefore, the press-fit resistance to the ground on the side of the minimum thickness point which is overcut is reduced, and the pressing plate 20 receives pressure from the ground on the side of the maximum thickness point. To change the direction of propulsion.

According to the underground propulsion device 1 of the present embodiment, a reliable direction correcting operation can be obtained by the overcutting operation of the excavating bit 4 in the eccentric leading pipe 6 and the operation of the pressing plate 20. Therefore, by changing the circumferential position of the front conduit 6 as shown in FIG. 8, the propulsion direction of the front conduit 6 and the propulsion pipe 2 connected thereto can be arbitrarily corrected. Therefore, the direction of the propulsion can be corrected as needed during the propulsion, and the accuracy of the direction of the propulsion can be increased as compared with the related art.

In order to correct the propulsion direction, the propulsion pipe 2
The means for turning to set the position in the circumferential direction is provided in the propulsion device 5 provided in the starting shaft. As will be described later in detail, during the propulsion, the accuracy of the propulsion direction is always measured, and when the direction needs to be corrected, the entire propulsion pipe 2 is turned to set the propulsion direction.

As shown in FIGS. 1 and 2, a roller bearing 21 is provided on the outer peripheral surface of the pipe portion 10 of the excavated body 8. The roller bearing 21 is in contact with the inner peripheral surface of the propulsion pipe 2 and supports the relative rotation of the propulsion pipe 2 and the pipe portion 10 in the circumferential direction. The roller bearing 21 is provided on each propulsion pipe 2
And each of the corresponding inner tubes 3.

The apparatus of this embodiment has means for supplying a lubricant between the propulsion pipe 2 and the ground. The lubricant is a fluid supplied between the outer peripheral surface of the propulsion pipe 2 and the ground in order to reduce the press-fit resistance of the propulsion pipe 2. As shown in FIG.
An annular packing 22 is provided between the outer peripheral surface of the pipe portion 10 of the excavation body 8 and the propulsion pipe 2 as sealing means. The space between the pipe portion 10 of the excavation body 8 and the propulsion pipe 2 is partitioned by an annular packing 22, and a space in front of the annular packing 22 is a lubricating material refilling chamber 23.

The pipe 10 which is the inner wall of the lubricant replenishing chamber 23
Is provided with a lubricant supply pipe 24 through a check valve (not shown).
Are connected, and are configured to supply the sliding material into the sliding material replenishing chamber 23. The supply pipe 24 is disposed in the inner pipe 3, and sends out a sliding material from the starting shaft where the propulsion device 5 is installed to the front of the propulsion pipe 2.

The propulsion pipe 2 which is the outer wall of the lubricant replenishing chamber 23
Is formed with a lubrication hole 25. When the lubricating material is injected into the lubricating material replenishing chamber 23 at the same time when the propelling tube 2 is pressed into the ground, the lubricating material in the lubricating material replenishing chamber 23 blows out of the propulsion tube 2 from the jet holes 25. The lubricating material jetted out of the propulsion tube 2 reduces the press-in resistance of the propulsion tube 2.

In the example shown in FIG.
Although they are provided side by side, this may be one. Moreover, the sealing property of the lubricant replenishing chamber 23 may be further enhanced by arranging three or more pieces. Further, as shown in FIG. 34, two annular packings 22 are provided behind the roller bearing 21 at a predetermined distance from each other.
A space defined between the two may be used as the lubricant replenishing chamber 23. A supply pipe 24 is connected to the lubricating material replenishing chamber 23 to supply the lubricating material. Let it.

In this embodiment, the pipe portion 10 of the excavated body 8 is
The lubrication replenishment chamber 23 is provided between the propulsion pipe 2 and the propulsion pipe 2. It may be provided. In this way, the lubricating material can be supplied not only to the propulsion pipe at the distal end but also to the ground between the outer peripheral surface of the subsequent propulsion pipe that is connected and propelled one after another and the ground. The propulsion resistance of the vehicle is further reduced.

Further, if the propelled soil is a sandy ground having good water permeability, the sand containing water around the propulsion pipe 2 is dehydrated by the penetration of the propulsion pipe 2, and the propelled pipe is formed by the dewatered sand. 2 is tightened, requiring more propulsive thrust. When the tightening force is large, a phenomenon may occur in which press-fitting and retraction are impossible. According to the underground propulsion device 1 of the present embodiment, the above-described problem is avoided because the underground propulsion device 1 includes the above-described slipping material supply unit. Accordingly, long-distance propulsion with high accuracy in the propulsion direction is possible.

As shown in FIG. 3 and FIG. 4, a water supply pipe 26 extends through the outer tube 12 of the excavating body 8 in parallel with the central axis. Water can be supplied to the drill bit 4 between the provided mounting members 13. A bellows-shaped telescopic pipe 27 is connected to the base end of the water supply pipe 26, and a water supply pipe 28 is connected to the telescopic pipe 27. The water supply pipe 28 is disposed in the inner pipe 3, and sends water from the starting shaft where the propulsion device 5 is installed to the front of the propulsion pipe 2. Even if the inner pipe 11 having the water supply pipe 28 moves with respect to the outer pipe 12 having the water supply pipe 26, the water supply pipe 28 and the water supply pipe 26 are connected to the telescopic pipe 2.
Since the connection is made at 7, no structural trouble occurs.

According to the underground propulsion device 1 of this embodiment, even if the area where the drill bit 4 opens and closes is clogged with earth and sand, the water can be injected from the water supply pipe 26 and removed. Therefore, even during propulsion, the excavation bit 4 can be smoothly opened and closed, so that the above-described excavation work by overcutting and the extraction work of the excavation bit 4 can be performed without any trouble.

When the object to be excavated is hard like rock, the excavation bit 4 generates heat due to friction with the rock. In this embodiment, since the water supplied from the water supply pipe 26 cools the drill bit 4, the service distance of the drill bit 4 is extended.

FIGS. 5 and 6 show another configuration example of the distal end portion of the propulsion pipe 2 in this embodiment. In the propulsion method, it is necessary to select and use a drill bit suitable for the condition of the ground to be propelled. For example, in the case of ordinary ground such as clay, silt, and sand, or in the ground containing cobblestones, use a cutting bit that cuts the ground, and in the case of ground or rock that contains large gravel, press the bit against the object and crush or crush it. It is preferable to use a crush type bit or a crush type bit.

However, during propulsion it is common to encounter various types of ground. Therefore, the present structural example includes a substantially cylindrical excavated body 8a in which the crushing bit 30 and the crushing bit 31 are combined.

In FIGS. 5 and 6, components having the same functions as those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted. An excavated body 8a is inserted into the front conduit 6 in this configuration example. The excavated body 8a has an outer tube 12, an inner tube 11, a crushing bit 30, and a crushing bit 31. The sliding structure of the outer tube 12 and the inner tube 11 is the same as in the above embodiment.

The crushing bit 31 is fixed to the tip of the outer tube 12. The crushable bit 30 is held by a holding member 32, and the holding member 32 is swingably attached to the outer tube 12 by a hinge 14. A wedge-shaped slider 33 is provided at the end of the inner tube 11. By moving the inner tube 3 forward, the wedge-shaped slider 33 is inserted between the rear end of the holding member 32 of the crushable bit 30 and the outer cylindrical tube 12, and the crushable bit 30 becomes With the wedge-shaped slider 33 fully opened and the wedge-shaped slider 33 fully inserted, the position of the crushable bit 30 is fixed at a position outside the front conduit 6. By pulling the inner tube 3 back to the starting shaft side, the wedge-shaped slider 33
Is detached from the holding member 32 of the crushable bit 30,
The crushable bit 30 can be tilted toward the central axis of the propulsion pipe 2 with the hinge 14 as a fulcrum. If the inner pipe 3 is further pulled back to the starting shaft side, the rupture type bit 30
And the crushing type bit 31 can be stored, and the bit can be exchanged.

According to the present structural example, the ordinary ground and the ground mixed with cobblestone can be taken out from the opening 34 in the excavated body 8a and discharged, and the large gravels that cannot be taken in can be taken in by the crushing bit 30 and the crushing bit 31. Can be crushed or crushed until For the bedrock, divide it with the crack type bit 30,
The crushing bit 31 can be crushed so that it can be taken into the opening 34 in the excavation body 8.

Generally, the propulsion working distance of the drill bit 4 is
It is related to the hardness of the object and the time when the object and the drill bit 4 are in contact, that is, the cumulative rotation distance of the drill bit. That is, the higher the hardness of the target object and the longer the cumulative rotation distance, the shorter the propulsion working distance of the drill bit 4. Another cause of shortening the propulsion working distance of the drill bit 4 is as follows.
The object rolls in conjunction with the rotation of the drill bit 4 and may directly hit the drill bit 4 and break it.

According to the structure of the propulsion conductor 9a of the present structural example, the crack type bit 30 is provided along the outer periphery of the excavated body 8a to divide the object into small pieces, and the object is stored through the opening 34 of the excavated body 8a. . An object having a size that cannot be stored from the opening 34 of the excavated body 8a is crushed into a shape that can be taken into the opening 34 by a crushing bit 31 arranged along the periphery of the opening 34. Therefore, in this structural example, the propulsion service distance between the crushing type bit 30 and the crushing type bit 31 is longer than before.

Furthermore, if each bit is not firmly fixed to the body of the excavated body and moves little by little with the rotation, not only the cutting into the object is bad and the excavating ability is significantly reduced, but also the rotation of the bit is linked. The bit to be rolled causes more damage to the bit. In this structural example, the excavated body 8a
Has a double pipe structure of an outer pipe 12 and an inner pipe 11, and the inner pipe 1
Since the wedge-shaped slider 33 interlocking with 1 enables the drill bit to be securely fixed, the cut into the object is good, and the propulsion working distance is longer than before.

Next, the propulsion device 5 will be described with reference to FIGS.
Will be described. The propulsion device 5 in the underground propulsion device 1
A function of mainly applying thrust to the propulsion pipe 2 to press it into the ground, a function of rotating the inner pipe 3 to cut the ground with the excavation bit 4, and a function of rotating the propulsion pipe 2 in a circumferential direction to propell. It has a function of correcting the propulsion direction of the pipe 2.

In the starting shaft where the propulsion of the propulsion pipe 2 is started, a foundation is constructed of concrete or the like. The foundation is provided with fixing means such as a steel anchor. The base 40 of the propulsion device 5 is fixed to this fixing means. The base 40 includes a pair of rail members 41, 41 arranged in parallel at a predetermined interval. Holes 45 are formed on the upper surface of each rail member 41 of the base 40 at predetermined intervals.

As shown in FIGS. 9, 11 and 12, a reaction force receiving slider 42 is provided on each rail member 41 of the base 40 so as to be movable. The reaction force receiving slider 42 is provided on a substrate 43 that moves in contact with the rail member 41.
And a pair of receiving plates 44 provided on the upper surface of the substrate 43 at predetermined intervals. A hole 46 corresponding to the hole 45 of the rail member 41 is formed in the substrate 43 between the receiving plates 44, 44. The reaction force receiving slider 42
Is set at a position on the rail member 41 such that the hole 46 matches the hole 45 of the rail member 41. Then, a fixing pin 47 is inserted through the hole 46 of the reaction force receiving slider 42 and the hole 45 of the rail member 41, and the pair of reaction force receiving sliders 42 is fixed at the same position on the pair of rail members 41, 41. You. The insertion and removal of the fixing pin 47 is performed by a hydraulic device (not shown).

Propulsion means for applying a thrust to the propulsion pipe 2 will be described. As shown in FIGS. 9 to 13, the propulsion means of this embodiment has a pair of push wheel sliders 50, 50 movably provided on each rail member 41 of the base 40. The pair of push wheel sliders 50 are connected by a push wheel 51. A hole having an inner diameter larger than the outer diameter of the inner tube 3 is provided at the center of the press ring 51 so that the inner tube 3 protruding from the rear end of the propulsion tube 2 is inserted.

Pressing wheel 5 corresponding to above each rail member 41
At two positions 1, the propulsion jacks 52 are fixed horizontally. That is, the base end of the barrel of the propulsion jack 52 is fixed to the pressing wheel 51, and the tip of the rod of the propulsion jack 52 is connected to the reaction force receiving slider 4 via the pin 53.
It is rotatably connected between the two receiving plates 44, 44.
The center axis of the propulsion jack 52 and the center axis of the propulsion pipe 2 are set at the same height. When the propulsion jack 52 is driven, the rod of the propulsion jack 52 is connected to the fixed reaction force receiving slider 42, so that the pressing wheel 51 and the pressing wheel slider 50 move along the base 40 as shown in FIG. You can move forward.

On the front surface of the push wheel 51, there are provided means for fixing the propulsion pipe 2 and propulsion direction setting means for rotating the fixed propulsion pipe 2 to set it at an arbitrary position in the circumferential direction. As shown in FIGS. 17 to 19, a connecting cylinder 61 is rotatably mounted on the front surface of the pressing wheel 51 via a thrust bearing 60. The connecting cylinder 61 has an inner diameter larger than the outer diameter of the inner pipe 3, and its central axis coincides with the inner pipe 3 and the propulsion pipe 2. Therefore, the connecting cylinder 61 can rotate outside the inner pipe 3 without contacting the inner pipe 3. An installation board 62 is integrally provided at the front end of the connection tube 61. The installation panel 62 is annular, and its inner diameter is larger than the outer diameter of the inner pipe 3, and its central axis coincides with the inner pipe 3 and the propulsion pipe 2.

As shown in FIGS. 17 and 19, a plurality of pipe fastening chucks 63 as fixing means for the propulsion pipe 2 are provided on the entire surface of the installation board 62 on the front surface of the installation board 62. The pipe clamping chuck 63 is mounted on the installation panel 6.
Jack reaction force table 64 fixed to 2 and slider reaction force table 6
Five. The pipe clamping chuck 63 includes a hydraulic jack 66 for exerting a clamping force and a jack 6.
6 has a tightening slider 67 that slides toward the outer peripheral surface of the propulsion pipe 2. The jack reaction force base 64 receives the reaction force of the driving force from the jack 66. The tightening slider 67 is movable with respect to the slider reaction force base 65, and its moving direction is inclined with respect to the radial direction of the propulsion pipe 2. The slider reaction force base 65 receives a reaction force of the force applied to the tightening slider 67 when the propulsion pipe 2 is fixed.

The pipe clamping chucks 63 are provided in several sets (two in the illustrated embodiment, for example, totaling two sets) with two sets having the same jack reaction force table 64 as one set. In each group, the moving directions of the two tightening sliders 67 are opposite to each other in the circumferential direction of the propulsion pipe 2, and approach the outer peripheral surface of the propulsion pipe 2 from an oblique direction.

Therefore, according to this fixing means, the tightening slider 67 is hard to slip on the outer peripheral surface of the propulsion pipe 2 and the propulsion pipe 2 is not deformed by the tightening. Can be uniformly tightened over the entire circumference, and can be securely and firmly fixed.

When the propulsion pipe 2 is propelled, the reaction force applied to the propulsion pipe 2 is applied to the installation board 62 of the pipe clamping chuck 63, and is received by the pressing wheel 51 via the thrust stress bearing 60. The pressing wheel 51 is a pressing wheel slider 50 of the propulsion means.
And oneness. Therefore, the propulsion tube 2 is smoothly propelled without squeaking.

As shown in FIGS. 17 and 18, between the rear surface of the installation board 62 and the front surface of the pressing wheel 51, four rotary jacks 70 (70a, 70a) are provided as propulsion direction setting means.
b) is provided. The two rotary jacks 70 a are in a state where the rod is contracted, and are installed at two positions that are symmetric with respect to the center axis of the installation board 62. These two rotary jacks 70a are such that the base end of the barrel is a pressing wheel 5a.
1 and the tip of the rod is connected to the installation board 62, and the installation board 62 is
8 Rotate counterclockwise.

The other two rotary jacks 70b are in a state where the rods are extended, are symmetrical with respect to the center axis of the installation board 62, and the two rotary jacks 70a with respect to the horizontal diameter line of the installation board 62. And two positions that are symmetrical with each other. In these two rotary jacks 70b, the base end side of the barrel is connected to the pressing wheel 51, and the tip of the rod is connected to the installation board 62. By contracting the rod, the installation board 62 is moved counterclockwise in FIG. Rotate.

When one of the two rotary jacks 70a extends the rod, the other two rotary jacks 70b contract the rod. When one of the two rotary jacks 70a contracts the rod, the other two rotary jacks 7a.
0b extends the rod.

The circumferential position of the propulsion pipe 2 by the rotary jack 70 is set as follows. First, the rear end of the propulsion pipe 2 is gripped by the pipe fastening chuck 63. The rod of one rotary jack 70a is extended and the rod of the other rotary jack 70b is contracted, and the installation board 62 and the propulsion pipe 2 fixed to the installation board 62 are rotated by a predetermined angle. The pipe fastening chuck 63 is opened to release the rear end of the propulsion pipe 2. The rod of one rotary jack 70a is contracted and the rod of the other rotary jack 70b is extended, and only the installation board 62 is rotated in the opposite direction by a predetermined angle. The rear end portion of the propulsion pipe 2 is gripped again by the pipe clamping chuck 63, and thereafter, the propulsion pipe 2 is similarly rotated by the rotary jack 70. Through this series of operations, the propulsion pipe 2 can be rotated in an arbitrary direction by an arbitrary angle, and the circumferential position of the propulsion pipe 2 can be set.

According to the propulsion direction setting means using the rotary jack 70, the propulsion pipe 2 can be smoothly rotated even when the propulsion pipe 2 is in the middle of propulsion. Further, since the rotation direction can be arbitrarily selected, for example, when returning the propulsion tube 2 to the original circumferential position, a direction in which the rotation distance is short can be selected, and the time required for rotation can be reduced.

Further, if the propulsion pipe 2 is rotated by the rotary jack 70 while propelling the propulsion pipe 2, the tightening resistance of the earth and sand around the propulsion pipe 2 becomes very small. It will be easier.

As shown in FIG. 17, the pressing wheel 51 has
A cooling water injection hole 71 is formed. The water injection hole 71 is opened on the inner peripheral surface of the hole 51a of the pressing wheel 51. Water injection hole 7
The cooling water supplied from 1 enters between the outer peripheral surface of the inner tube 3 passing through the hole and the inner peripheral surface of the connection tube 61, and is further supplied between the inner tube 3 and the propulsion tube 2, and The roller bearing 21 between the propulsion pipes 2 is cooled.

As shown in FIG. 17, an inner pipe support ring 72 is attached to the hole 51a of the pressing wheel 51 from the rear side of the pressing wheel 51. A packing 73 is provided on the inner surface of the inner tube support ring 72 and is in contact with the outer peripheral surface of the inner tube 3. Therefore, the cooling water does not leak backward from the hole 51a of the press wheel 51.

The driving means for rotating the inner tube 3 will be described with reference to FIGS. The driving means is the base 4
0 has a pair of drive unit sliders 80, 80 movably provided on each rail member 41. The driving unit slider 80 is provided between the pressing wheel slider 50 and the reaction force receiving slider 42. The pair of drive unit sliders 80, 80 are provided on a common frame 81.

The frame 81 has two main walls 82 at a predetermined interval parallel to a plane perpendicular to the propulsion direction. At the center of each main wall 82, a hole 82a through which the inner pipe 3 can be inserted is provided. On both sides of each of the main walls 82, a total of four wing plates 83 projecting above the respective rail members 41 are provided. Each wing plate 83 has
A hole 83a having a diameter larger than that of the propulsion jack 52 fixed to the pressing wheel 51 is formed, and the barrel of the propulsion jack 52 is inserted without contacting each blade 83.

A pedestal 84 is mounted on the main wall 82 substantially horizontally. On the pedestal 84, the drive motor 8
5 and a speed reducer 86 linked to the drive motor 85 are provided. A spindle rod 87 is rotatably installed in the hole 82a of the main wall 82. Spindle rod 8
A plurality of sprockets 88 are integrally fixed to the outer peripheral surface of the rear end of the unit 7. A chain 90 is looped between the sprocket 88 and a sprocket 89 provided on the output shaft of the speed reducer 86. The rear end of the inner pipe 3 projecting rearward from the rear end of the propulsion pipe 2 is connected to the spindle rod 87. Therefore, when the drive motor 85 is driven, the spindle rod 87 and the inner pipe 3 connected to the spindle rod 87 rotate, and an appropriate excavation torque is transmitted to the excavation bit 4.

As shown in FIG. 9, a thrust transmitting plate 91 is fixed substantially at the center of the barrel of the thrust jack 52 fixed to the pressing wheel 51. The propulsion jack 52 includes a pair of wing plates 8 arranged in the frame 81 in the propulsion direction.
The thrust transmitting plate 91 is located between the two wing plates 83, 83 while passing through the holes 83a, 83a. The diameter of the thrust transmitting plate 91 is equal to the hole 83 of the wing plate 83.
It is larger than a. Although the thickness of the thrust transmitting plate 91 is smaller than the distance between the two wing plates 83, at least one thrust transmitting auxiliary plate 92 and a plurality of thrust transmitting plates 91 are provided between each of the wing plates 83, 83 and the thrust transmitting plate 91. Three (three in this embodiment) propulsion force transmission auxiliary plates 93 are interposed without gaps. Therefore, when the propulsion jack 52 operates and moves forward, the propulsion force transmission plate 91 presses the front wing plate 83 in the same direction via the propulsion force transmission auxiliary plates 92 and 93. As shown in FIGS. 15 and 16, the propulsion force transmission assisting plate 92 is substantially U-shaped, and a plurality (three in this embodiment) of pressure gauges 94 are provided therein.

According to the propulsion device 5 of the underground propulsion device 1,
The push wheel slider 50 for propelling the propulsion pipe 2 and the driving slider 80 for rotating the inner pipe 3 are independent of each other, and the propulsion force of the propulsion jack 52 is transmitted through the propulsion force transmission plate 91 and the propulsion force transmission auxiliary plate 92. When the propulsion jack 52 propels the propulsion pipe 2, the reaction force applied to the excavation bit 4 from the ground at the tip of the inner pipe 3 is transmitted by the pressure gauge 94. Can be measured.

This reaction force may be measured by a pressure gauge provided inside the wing plate 83.

In the construction method in which the propulsion tube 2 is pressed into the ground by the propulsion device 5 in the starting shaft, as in the underground propulsion device 1, the press-in resistance on the outer peripheral surface of the propulsion tube 2 and the bending of the propulsion tube 2 are caused. The thrust applied by the propulsion device 5 is not transmitted to the excavation bit 4 as it is due to resistance, fastening resistance due to sand having good water permeability, or the like.

The longer the propulsion distance is, the more difficult it is to grasp the thrust transmitted to the tip of the drill bit 4. In the conventional propulsion work, the propulsion force of the propulsion device 5 is determined depending on the intuition of the operator, but it cannot be confirmed whether or not the stress suitable for the excavation target is really applied to the excavation bit 4. Was. Excessive propulsion leads to loss of the drill bit 4, reduction in the accuracy of the propulsion direction, or damage to the propulsion pipe 2 itself.

According to the propulsion device 5, the reaction force applied to the excavation bit 4 from the ground at the tip of the inner pipe 3 can be measured by the pressure gauge 94 in the starting shaft. The propulsion jack 52 of the push wheel slider 50 is connected to the propulsion pipe 2.
If the thrust to be applied to the is adjusted appropriately based on this measurement,
An optimum excavation stress can always be applied to the excavation bit 4 in use. Therefore, the accuracy of propulsion and the durability of the drill bit 4 are improved.

Next, an underground propulsion method using the underground propulsion device 1 will be described in the order of steps for each figure with reference to FIGS. For components that do not appear in FIGS. 20 to 33, see FIGS. 1 to 19.

(1) FIG. 20 The propulsion device 5 is lowered into the starting shaft 100, the direction and the gradient of the propulsion device 5 are set, and the propulsion device 5 is fixed to the fixing means 101 such as a steel anchor previously embedded in the foundation. Base 4
0 is fixed. The front pipe 6 is connected to the tip of the propulsion pipe 2 outside the starting shaft 100, and the pipe 1 having the same diameter as the inner pipe 3 is connected to the tip of the inner pipe 3.
An excavation body 8 having an excavation bit 4 or the like attached to the tip of the excavator 0 is inserted into the propulsion pipe 2. Start shaft 1
00, the rear end of the propulsion pipe 2 is fixed by the pipe clamping chuck 63 of the pressing wheel of the propulsion device 5, and the rear end of the inner pipe 3 is connected to the spindle rod 87. The propulsion pipe 2
It is fixed between the wellhead 102 and the press wheel 51 in a predetermined direction and gradient. The reaction force receiving slider 42, the pressing wheel slider 50, and the driving unit slider 80 are set at the rearmost positions.

The wellhead 102 is defined as the starting shaft 10
0 is an opening formed on the wall of
It is formed in such a size and position that the propulsion pipe 2 can penetrate in the direction. In addition, a water stopping means having a packing structure is provided at the wellhead 102 so that water and earth and sand do not flow into the well from a gap between the wellhead 102 and the propulsion pipe 2.

(2) FIG. 21 By driving the drive motor 85, the inner pipe 3 and the pipe section 10 in the propulsion pipe 2 are rotated via the spindle rod 87, and the ground is excavated with the excavation bit 4. At the same time, the propulsion jack 52 of the push wheel slider 50 is driven, and the push wheel slider 5 is driven.
0 is advanced to press-fit the propulsion pipe 2 into the ground. The drive slider 80 connected to the thrust transmitting plate 91 fixed to the propulsion jack 52 via the thrust transmitting auxiliary plates 92 and 93 moves following the movement of the push wheel slider 50.
The reaction force at the time of propulsion is received by the fixing pin 47 which has inserted the reaction force receiving slider 42 into the hole 45 of the base 40. When the propulsion jack 52 is completely extended, the propulsion is stopped once, the fixing pin 47 of the reaction force receiving slider 42 is removed, and the propulsion jack 5 is stopped.
Degenerate 2. The reaction force receiving slider 42 slides on the base 40 and moves to a forward position. The reaction force receiving slider 42 is fixed to the base 40 with the fixing pins 47, and the propulsion of the propulsion tube 2 is repeated in the same manner thereafter.

(3) FIG. 22 The propulsion pipe 2 and the inner pipe 3 connecting the pipe section 10 are connected to the propulsion device 5
Disconnect from Push wheel slider 50 / drive unit slider 80
-The reaction force receiving slider 42 is retracted and set to the rearmost position. A thing in which the inner pipe 3 is incorporated in the propulsion pipe 2 is prepared outside the starting shaft 100 in advance. This is lowered onto the propulsion device 5 in the starting shaft 100, connected to the preceding propulsion tube 2 and the inner tube 3, respectively, and attached to the propulsion device 5.

(4) FIGS. 23 to 26 Thereafter, the steps shown in FIGS. 20 to 22 are repeated. That is,
As shown in FIGS. 23 and 24, the excavation bit 4 is rotated to excavate the ground, and the propulsion pipe 2 is pressed into the ground. As shown in FIG. 25, when the pipe fastening chuck 63 of the propulsion device 5 comes near the wellhead 102, the propulsion is temporarily stopped. Then, as shown in FIG. 26, the propulsion pipe 2 and the inner pipe 3 are separated from the propulsion device 5, and the propulsion device 5 is retracted. The next propulsion pipe 2 and inner pipe 3 are lowered into the starting shaft 100, which is added to the preceding propulsion pipe 2 and inner pipe 3 and connected to the propulsion device 5.

The propulsion pipe 2 and the inner pipe 3 which are successively added
Is not always the same. The processing error of the propulsion pipe 2 and the manufacturing error of the inner pipe 3 are accumulated as they are added, and the propulsion device 5 in the starting shaft 100 is provided with the following propulsion pipe 2.
When connecting the inner pipe 3 and the inner pipe 3,
In some cases, a trouble may occur in the connection space 7. For example,
The space for connecting the inner pipe 3 is insufficient on the long side where the manufacturing error of the propulsion pipe 2 is long, and the space for connecting the inner pipe 3 is excessive on the short side.

When the connection position of the inner pipe 3 is shifted and the space required for the connection becomes excessive or insufficient, the position of the propulsion force transmission plate 91 of the propulsion jack 52 provided on the pressing wheel slider 50 side is determined. The positions of the pair of blades 83 provided on the drive unit slider 80 are shifted. In such a case, an appropriate number of auxiliary driving force transmission plates 92 or 93 having an appropriate thickness are set between the plates 91 and 83 according to the distance between the driving force transmission plate 91 and the wing plate 83. I just need. In addition, it is desirable that one propulsion force transmission auxiliary plate 92 having a built-in pressure gauge is included in the set propulsion force transmission auxiliary plate. In this manner, the two plates 91, 8 are formed by using the propulsion force transmission auxiliary plate 92 or 93 or the like.
By properly setting the distance between the inner pipe 3 and the drive unit slider 80, even if there is a slight manufacturing error in the axial length of the propulsion pipe 2 or the like to be added, the connection relation between the inner pipe 3 and the drive unit slider 80 may occur. However, the propulsive force of the push wheel slider 50 is reliably transmitted to the drive unit slider 80.

According to the propulsion device 5, the reaction force applied to the excavation bit 4 from the ground at the tip of the inner pipe 3 is measured by the pressure gauge 94 of the propulsion transmission auxiliary plate 92.
It can be measured within zero. Then, the pressing wheel slider 5
If the thrust applied by the thrust jack 52 to the thrust pipe 2 is appropriately adjusted based on this measurement, the drill bit 4
Optimum excavation stress can always be applied. Therefore,
The accuracy of propulsion and the durability of the drill bit 4 are improved. Also,
Since the underground propulsion device 1 has the means for supplying the lubricating material to the propulsion conductor 9, the propulsion resistance between the propulsion pipe 2 and the ground is significantly reduced. Accordingly, long-distance propulsion with high accuracy in the propulsion direction is possible.

(5) FIG. 27 The propulsion is performed until the propulsion conductor 9 at the tip of the propulsion pipe 2 penetrates the reaching shaft 103. During propulsion, the earth and sand excavated by the excavation bit 4 is taken into the inner pipe 3. On the inner surface of the inner pipe 3, there is provided means for guiding earth and sand in which a cord-like or belt-like steel material is spirally arranged. The sediment taken in the inner pipe 3 is driven by the guiding means rotating together with the inner pipe 3 to start the shaft 100.
And is discharged from the inner pipe 3 to the outside.

(6) FIG. 28 The leading conduit 6 provided with the pressing plate 20 is collected in the reaching shaft 103. The excavation bit 4 and the inner pipe 3 are pulled back to the starting shaft 100 side and carried out from the starting shaft 100. The propulsion pipe 2 remains in the ground, and the propulsion is completed.

Next, in the underground propulsion method using the underground propulsion device 1, a process for exchanging the excavation bit 4 during propulsion will be described with reference to FIGS.

(7) FIG. 29 FIG. 29 shows a state in which normal propulsion is performed by the underground propulsion apparatus 1 and the method of this embodiment. Generally, when propulsion is performed over a long distance, the thrust at the tip of the drill bit 4 becomes difficult to grasp. However, according to the present embodiment, the pressing wheel slider 50 for propelling the propulsion tube 2 and the driving unit slider 80 for rotating the inner tube 3 are independent of each other, and the propulsion force of the propulsion jack 52 is applied to the inner tube 3 and the drill bit 4. When the propulsion jack 52 propells the propulsion pipe 2, the reaction force applied to the excavation bit 4 from the ground at the tip of the inner pipe 3 is transmitted between the pressing wheel slider 50 and the driving section slider 80. It can be measured by a pressure gauge 94 mounted.

Therefore, if the propulsion force of the propulsion jack 52 is appropriately adjusted based on this measurement,
Optimum excavation stress can always be applied. Therefore,
The accuracy of propulsion and the durability of the drill bit 4 are improved. Or
From the measurement of the pressure, the state of the drill bit 4 can be grasped. For example, damage to the drill bit 4 can be detected from a sudden change in the measured value.

(8) FIG. 30 Corresponding to the case where the occurrence of breakage or the like of the excavation bit 4 is detected from the detection value of the pressure gauge 94 or the case where the type of ground to be excavated has changed. Drill bit 4
Must be replaced. In this case, first, the propulsion device 5 is separated from the propulsion pipe 2 and the inner pipe 3, and the propulsion device 5 is retracted. The inner pipe 3 is pulled back into the starting shaft 100 and temporarily collected.

According to the structure of the propulsion conductor 9 in this embodiment, the inner tube 11 and the outer tube 12 of the excavated body 8 are meshed with each other in a spline structure, and the inner tube 11 And the outer tube 12 are slidable. Therefore,
If the inner tube 3 is pulled as described above and the inner tube 11 that has pushed the drill bit 4 is pulled back, the drill bit 4 can be closed from the excavation position to the storage position. For this reason, the outer pipe 12 to which the excavation bit 4 is attached can be drawn into the propulsion pipe 2.

(9) FIG. 31 All the inner pipes 3 are pulled out, and the propulsion conductor 9 having the drill bit 4 is pulled back into the starting shaft 100 and collected. After exchanging the excavation bit 4, a step reverse to the step of pulling back the propulsion destination conductor 9 and the inner pipe 3 is performed, and excavation is started again.

Next, in the underground propulsion method using the underground propulsion device 1, steps in the case where the direction is corrected during the propulsion will be described with reference to FIGS.

(10) FIG. 32 In a normal excavation state, the drive motor 8 of the propulsion device 5
5 is driven to rotate the excavating bit 4 together with the inner pipe 3, and at the same time, the propulsion pipe 2 is propelled by the propulsion jack 52.

(11) FIG. 33 During propulsion, the direction of propulsion is periodically measured. If it is determined that an error to be corrected occurs in the propulsion direction, the propulsion direction is corrected. That is, in parallel with the propulsion of the propulsion pipe 2, the entirety of the propulsion pipe 2 in the ground is rotated by the rotary jack 70 as the propulsion direction setting means, and the pressing plate 20 on the outer peripheral surface of the leading conduit 6 is moved in the circumferential direction. Set to the desired position. Then, the propulsion is continued, the propulsion direction of the propulsion pipe 2 is guided to a desired direction, and the direction is corrected.

The propulsion pipe 2 buried in the ground in the above-described steps and penetrated between the starting shaft 100 and the reaching shaft 103
Can be used as a water pipe, a sewer pipe, a gas pipe, a sheath pipe for laying an electric / communication cable, and the like. As other applications, there are a method of replacing an existing sewer and a pipe roof method.

[0108]

According to the underground propulsion apparatus of the present invention and the underground propulsion method using the same, the stress applied to the drill bit can be detected, and the drill bit can be inserted into the propulsion pipe if necessary. It can be pulled out and pulled out of the starting pit for replacement.

Therefore, in the apparatus and method of the present invention, if the excavation bit is replaced in accordance with the progress of the wear of the excavation bit or the like in accordance with the type of the ground encountered, efficient and highly accurate underground propulsion can be achieved. Because the method can be used, excessive wear and breakage of the drill bit are unlikely to occur, and the effect of improving the accuracy of the propulsion direction is improved. Can be

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a structure near a distal end of a propulsion pipe 2 according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a structure near a distal end of a propulsion pipe 2 according to an embodiment of the present invention, and shows a state in which a drill bit 4 is set to a drilling position.

FIG. 3 is an enlarged sectional view showing a structure near a distal end of a propulsion pipe 2 according to an embodiment of the present invention.

FIG. 4 is an enlarged sectional view showing the structure near the tip of the propulsion pipe 2 in one embodiment of the present invention, and shows a state in which the excavation bit 4 is set to an excavation position.

FIG. 5 is a cross-sectional view showing another example of the structure near the distal end of the propulsion pipe 2 in one embodiment of the present invention.

FIG. 6 is a cross-sectional view showing another example of the structure near the distal end of the propulsion pipe 2 in one embodiment of the present invention.

FIG. 7A is a front view showing a structure of a front conduit 6 in one embodiment of the present invention, and FIG. 7B is a side view of the same.

8 (a), (b) and (c) are front views showing the direction correcting action by the front conduit 6 having the pressing plate 20 in one embodiment of the present invention.

FIG. 9 is a side view of a part of the vicinity of the propulsion device 5 in one embodiment of the present invention, which is a cross section.

FIG. 10 is a plan view showing a structure near a propulsion device 5 in one embodiment of the present invention.

FIG. 11 is a half sectional view taken along line AA of FIG. 9;

FIG. 12 is a sectional view taken along the line BB of FIG. 11;

FIG. 13 is a sectional view taken along the line CC of FIG. 11;

FIG. 14 is a side view showing a cross section of a part in the vicinity of the propulsion device 5 in one embodiment of the present invention, showing a state in which the propulsion pipe 2 is propelled.

FIG. 15 is a sectional view of a propulsion force transmission auxiliary plate 92 according to an embodiment of the present invention.

FIG. 16 is a sectional view taken along the line DD in FIG. 15;

FIG. 17 is a cross-sectional view showing a structure near a press wheel 51 in one embodiment of the present invention.

18 is a cross-sectional view taken along the line EE in FIG. 17;

19 is a sectional view taken along the line FF in FIG. 17;

FIG. 20 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to one embodiment of the present invention.

FIG. 21 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to one embodiment of the present invention.

FIG. 22 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to one embodiment of the present invention.

FIG. 23 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to one embodiment of the present invention.

FIG. 24 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to an embodiment of the present invention.

FIG. 25 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to one embodiment of the present invention.

FIG. 26 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to one embodiment of the present invention.

FIG. 27 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to one embodiment of the present invention.

FIG. 28 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to one embodiment of the present invention.

FIG. 29 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to an embodiment of the present invention.

FIG. 30 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to an embodiment of the present invention.

FIG. 31 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to one embodiment of the present invention.

FIG. 32 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to an embodiment of the present invention.

FIG. 33 is a process diagram of an underground propulsion method using the underground propulsion device 1 according to an embodiment of the present invention.

FIG. 34 is a cross-sectional view showing another embodiment of the structure near the distal end of the propulsion pipe 2 in the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground propulsion device 2 Propulsion pipe 3 Inner pipe 4 Drilling bit 6 Lead pipe 8 Excavated body 10 Pipe part 11 Inner pipe as first pipe constituting pipe part 12 Second part forming pipe part Outer tube 20 as a tube tube 20 Pressing plate 22 Annular packing 23 as partitioning means 23 Sliding material replenishment chamber 24 Supply tube constituting supply means 25 Spout hole as supply hole for lubricating material 30 Compression type bit as excavation bit 31 Crushing type bit as a drilling bit 40 Base 50 Push wheel slider 52 as a propulsion means 52 Propulsion jack as a propulsion means 70 Rotary jack as a propulsion direction setting means 80 Driving part slider 85 as a driving means 85 Driving means Drive motor 94 Pressure gauge as pressure detection means

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichi Ishikawa 4-3-1 Nishioginami, Suginami-ku, Tokyo (72) Inventor Tetsuo Kameyama 488-2 Kafunatsu, Mitsuhashi-cho, Sanmon-gun, Fukuoka Prefecture (56) References JP Hei 1-268992 (JP, A) JP-A-61-21297 (JP, A) JP-A 63-86198 (JP, U) JP-A 4-46187 (JP, U)

Claims (8)

(57) [Claims] 1. A propulsion pipe which is pressed into the ground, and said propulsion pipe
An inner pipe which is inserted into the inner pipe and rotates;
It is movable within a predetermined range in the axial direction with the first cylindrical tube
Is provided coaxially with the first cylindrical tube so that
A second cylinder which rotates integrally with the first tubular pipe in the propulsion pipe.
A cylindrical tube, and a swingably provided at a distal end portion of the second cylindrical tube.
Is pushed by the tip of the first cylindrical tube that has moved in the axial direction.
When set to the excavation position where excavation is performed in front of the propulsion pipe
In both cases, when replacing the drill bit, pull in the inner pipe
Drill bit drawn into the storage position inside the propulsion pipe
Underground propulsion device with 2. The excavation screw from the tip of the second cylindrical pipe.
2. The underground thrust according to claim 1, further comprising means for injecting water into the pit.
Hex device. 3. A contractor wherein the drill bit is a split-type bit.
The underground propulsion device according to claim 1. 4. A crushing type bit is provided at the tip of said second cylindrical tube.
The underground propulsion device according to claim 3, wherein the underground propulsion device is fixed. 5. A propulsion pipe pressed into the ground, and said propulsion pipe
An inner pipe which is inserted into the inner pipe and rotates;
It is movable within a predetermined range in the axial direction with the first cylindrical tube
Is provided coaxially with the first cylindrical tube so that
A second cylinder which rotates integrally with the first tubular pipe in the propulsion pipe.
A cylindrical tube, and a swingably provided at a distal end portion of the second cylindrical tube.
Is pushed by the tip of the first cylindrical tube that has moved in the axial direction.
When set to the excavation position where excavation is performed in front of the propulsion pipe
In both cases, when replacing the drill bit, pull in the inner pipe
Drill bit drawn into the storage position inside the propulsion pipe
And a base, and movably provided with respect to the base,
Fixing the rear end of the propulsion tube to apply thrust to the propulsion tube
Advance means, provided movably with respect to the base,
While applying a rotational force to the inner pipe, it is pressed by the propulsion means.
Underground propulsion device comprising: 6. A thrust at a tip of the drill bit is detected.
6. The underground propulsion device according to claim 5, further comprising a pressure detecting means for outputting the pressure.
Place. 7. A ground using the underground propulsion device according to claim 1.
In the medium propulsion method , excavation is stopped during
Pull the pipe back in the direction opposite to the direction of propulsion and remove the drill bit.
Pull into the inside of the propulsion pipe, and from the rear end of the propulsion pipe together with the inner pipe
After pulling out and replacing it, insert it into the propulsion pipe again for drilling.
Underground propulsion method characterized by restarting. 8. A ground using the underground propulsion device according to claim 6.
In the middle propulsion method, the excavation detected by the pressure detection means
Excavation during excavation according to the value of thrust at the tip of the bit
And pull the inner tube in the direction opposite to the direction of propulsion.
Return the drill bit to the inside of the propulsion pipe
Together with the propulsion pipe from the rear end, replace it and replace it again.
Underground characterized by being inserted into a runway and restarting excavation
Promotion method.