JPH07269284A - Underground jacking device and underground jacking method - Google Patents

Abstract

PURPOSE:To make it possible to replace excavation bits on the way of excavation work. CONSTITUTION:An inner pipe 3, which is rotatively driven, is mounted inside a steering pipe 2 which is advancing underground. An inner pipe 11 is fixed with the tip of the inner pipe 3 inside the steering pipe 2. The inner pipe 11 is structurally integrated with an outer pipe 12 by way of a spline structure which comprises a groove and an projection. Both pipes are axially movable within a specified range and united in one piece in the rotary direction. Excavation bits 4 are installed to the tip of the outer pipe 12 in a rocking manner. When driving, if the inner pipe 3 is moved forward, the outer pipe 12 will run into an engagement part 7 of the jack pipe 2 so that it may be fixed. The inner pipe 11 slides forward against the outer pipe 12, thereby pressing the excavation bits 4 and setting the bits at the excavation position in front of the jack pipe 2. The ground is excavated by driving the jack pipe 2, rotating the inner pipe 3 and the excavation bits in front of the jack pipe 2. Even on the way of jacking, if the inner pipe 3 is pulled backward, the excavation bits 4 will be closed so that it may be possible to replace the excavation bits by pulling out from the rear end of the jack pipe 2.

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 and an underground propulsion method which can be effectively applied to a wide variety of grounds.

[0002]

2. Description of the Related Art A mechanical propulsion method is a method of excavating the natural rock by an excavating means which is driven in front of a propulsion pipe, and press-fitting the propulsion pipe into the natural rock from behind by a propulsion device. Then, the excavated earth and sand or the like is fluid-transported by using water pressure, air pressure, or the like, or is discharged by using an earth-discharging mechanism provided in the propulsion pipe.

The excavating bit and the excavating method used in the mechanical propulsion method are properly selected according to the target soil to be excavated. A cutting type excavating bit is generally used for ground that is relatively easy to dig, such as ordinary soil and cobblestone mixed soil.

For the ground or rock containing gravel or large gravel, the object has to be cut out or crushed. Therefore, a wedge-shaped disc-shaped bit is pressed against the object to divide it into small pieces. A crushing type excavating bit that crushes an object by chipping a cemented carbide bit or a cemented carbide bit is used.

In addition to each of the above-mentioned excavation methods, there are an impact type in which an object is crushed by an air hammer and a composite type excavation method in which two or more types of the excavation methods are combined. Each method has advantages and disadvantages, and the characteristics of the object must be carefully considered and used properly.

[0006]

In general, the ground to be excavated by the propulsion method is generally not uniform, and for example, the ground containing gravel changes to rock or changes from rock to ordinary soil. The hardness and other properties of these grounds are not uniform, and it was difficult to efficiently excavate all of these grounds with high precision using only a single type of drill bit. Therefore, every time the target soil changed, it was necessary to replace the excavation bit with a soil bit suitable for the soil condition.

The ground containing hard gravel and hard rock are the most difficult objects for the propulsion method. When excavating the ground, crush and crush the huge gravel or rock into a size that can be discharged from the propulsion pipe. There is a need. There are excavating bits suitable for excavating such huge gravel and bedrock, but their useful distance is naturally limited. Therefore, even if the target soil does not change, in excavation for the ground including huge gravel, hard rock, etc., the excavation bit must be replaced midway in order to propel a particularly long section.

Further, in the propulsion method, the excavation efficiency of the excavation bit and the propulsion force are closely related to each other. Excessive propulsion force promotes wear and loss of the excavation bit to shorten the service life of the bit and improve propulsion accuracy. Lower. Under-propulsion force cannot exert the original capability of the excavating bit, which significantly reduces excavation efficiency.

Therefore, if the object of excavation is a large gravel layer or rock as described above, the propulsion force must be determined so that an appropriate stress suitable for it can be transmitted to the excavation bit.
In the conventional underground propulsion device, the stress actually applied to the face by the excavating bit could not be correctly determined. When the propulsion pipe is propelled to some extent, the propulsive 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. Therefore, the propulsive force indicated by the jack of the propulsion device at the proximal end of the propulsion pipe does not necessarily match the stress applied to the drill bit at the distal end 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 applied to the drill bit has not been accurately grasped, it is possible that the stress applied to the drill bit becomes excessive.In such a case, damage / wear progress of the drill bit / propulsion direction It was connected to the error spread.

The present invention has been made in view of the above-mentioned difficulties, and the excavation bit can be replaced as needed during propulsion, and the stress applied to the excavation bit can be accurately grasped to improve propulsion accuracy and An object is to provide an underground propulsion device and an underground propulsion method capable of performing propulsion with high propulsion efficiency.

[0012]

A submersible propulsion apparatus according to the present invention comprises a propulsion pipe that is press-fitted into the ground, an inner pipe that is inserted into the propulsion pipe to rotate, and excavation is performed in front of the propulsion pipe. It is characterized in that it has an excavation bit provided at a tip end portion of the inner pipe so as to be movable between a drilling position to be carried out and a storage position to be stored inside the propulsion pipe.

The underground propulsion device according to a second aspect of the present invention is provided with a propulsion pipe that is press-fitted into the ground, an inner pipe that is inserted into the propulsion pipe and rotates, and a propulsion pipe that is provided at a tip portion of the inner pipe. At times, the excavation bit is rotated in front of the propulsion pipe by the rotation of the inner pipe, and at the time of exchanging the excavation bit, the excavation body for accommodating the excavation bit inside the propulsion pipe is provided. .

According to a third aspect of the present invention, there is provided a submersible propulsion device in which a propulsion pipe is press-fitted into the ground, an inner pipe is inserted into the propulsion pipe to rotate, and a first pipe is provided at a tip portion of the inner pipe. No. 1 cylindrical tube is provided coaxially with the first cylindrical tube so as to be movable within a predetermined range in the axial direction, and rotates in the circumferential direction integrally with the first cylindrical tube in the propulsion tube. 2 cylindrical tubes, and the second
Of the excavating bit, which is swingably provided at the distal end of the cylindrical pipe, is pressed by the axially moved distal end of the first cylindrical pipe, and is set at the excavating position for excavating in front of the propulsion pipe. It is characterized in that it has an excavating bit that is pulled into a storage position inside the propulsion pipe when the inner pipe is pulled in at the time of replacement.

An underground propulsion device according to a fourth aspect of the present invention is the underground propulsion device according to the third aspect, further comprising means for injecting water from the tip end portion of the second tubular pipe to the excavation bit. Is characterized by.

An underground propulsion device according to a fifth aspect of the present invention is characterized in that, in the underground propulsion device according to the third aspect, the excavating bit is a crack type bit.

An underground propulsion device according to a sixth aspect of the present invention is the underground propulsion device according to the fifth aspect, characterized in that a crushing type bit is fixedly provided at a tip end portion of the second cylindrical pipe. There is.

The underground propulsion method according to a seventh aspect of the present invention is a propulsion pipe that is press-fitted into the ground, an inner pipe that is inserted into the propulsion pipe to rotate, and a first pipe provided at a tip end portion of the inner pipe. No. 1 cylindrical tube is provided coaxially with the first cylindrical tube so as to be movable within a predetermined range in the axial direction, and rotates in the circumferential direction integrally with the first cylindrical tube in the propulsion tube. 2 cylindrical tubes, and the second
Of the excavating bit, which is swingably provided at the distal end of the cylindrical pipe, is pressed by the axially moved distal end of the first cylindrical pipe, and is set at the excavating position for excavating in front of the propulsion pipe. When exchanging, the inner pipe is retracted to the storage position inside the propulsion pipe, the excavation bit, the base, and the base are movably provided with respect to the base, and the rear end of the propulsion pipe is fixed and propelled. A propelling means for giving a propulsive force to the pipe, and a drive means provided so as to be movable with respect to the base so as to give a rotational force to the inner pipe and pressed by the propelling means. .

An underground propulsion device according to an eighth aspect of the present invention is the underground propulsion device according to the seventh aspect, further comprising a pressure detecting means for detecting a thrust force at the tip of the excavation bit.

The underground propulsion method according to a ninth aspect is the underground propulsion method using the underground propulsion device according to the third aspect, wherein the excavation is stopped during the excavation and the inner pipe is opposite to the propulsion direction. Direction, the excavation 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 inserted again into the propulsion pipe to restart excavation.

The subsurface propulsion method described in claim 10 is
The underground propulsion method using the underground propulsion device according to claim 8, wherein the excavation is stopped during the excavation in accordance with the value of the stress at the tip of the excavation bit detected by the pressure detection means, and the inner pipe is further propelled. It is characterized in that the excavation bit is pulled back in the opposite direction to the inside of the propulsion pipe, is withdrawn from the rear end of the propulsion pipe together with the inner pipe, is exchanged, and is inserted again into the propulsion pipe to restart excavation.

[0022]

The propelling means propels the propulsion tube, and the driving means rotates the inner tube. 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 cylindrical pipe connected to the inner pipe moves in the axial direction with respect to the second cylindrical pipe. The excavation bit provided in the second tubular pipe is pressed by the first tubular pipe and set at the excavation position in front of the propulsion pipe.

When exchanging the excavation bit during the propulsion, the propulsion is stopped and the inner pipe is pulled out. The first tubular pipe moves relatively rearward with respect to the second tubular pipe, and the pressing and fixing of the drill bit by the first tubular pipe is released. The drill bit is set in the stowed position and retracted inside the propulsion tube. After exchanging the excavating bit, insert the inner pipe etc. into the propulsion pipe again.

[0024]

EXAMPLE An underground propulsion apparatus and an underground propulsion method according to an example will be described with reference to FIGS. The subterranean propulsion apparatus 1 includes a propulsion pipe 2 that is press-fitted 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. It has an excavation bit 4 that rotates at 1, and a propulsion device 5 that is a drive unit of this device.
The propulsion device 5 presses the propulsion pipe 2 to press it into the ground and rotates the inner pipe 3 to rotate the inner pipe 3 to excavate the bit 4.
It has a function to excavate the ground.

First, referring to FIGS. 1 to 8, the structure in the vicinity of the tips of the propulsion pipe 2 and the inner pipe 3 for excavation will be described. As shown in FIGS. 1 to 4, a tip conduit 6 is attached to the tip of the propulsion tube 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, so that the wall thickness of the front conduit 6 is not constant. The portion having the largest wall thickness and the portion having the smallest wall thickness are located 180 ° apart from each other in the circumferential direction of the pipe. On the inner peripheral portion of the front end of the front conduit 6, a locking portion 7 protruding inward is formed in a circumferential shape.

The leading conduit 6 has an outer diameter slightly larger than the outer diameter of the propulsion pipe 2. Connection of both pipes with different outer diameters is performed as follows. That is, the generatrix of the leading conduit 6 at the maximum wall thickness of the leading conduit 6 does not protrude outward than the generatrix 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 so. Further, the busbar of the front conduit 6 at the minimum thickness point is located slightly outwardly of the busbar of the outer peripheral surface of the propulsion pipe 2 connected to this portion.

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

The excavated body 8 has a pipe portion 10 attached to the tip of the inner pipe 3 and a first portion provided at the tip of the pipe portion 10.
Provided at the tip of the outer tubular tube 12 of the tubular tubular portion, and an inner tubular tube 11 that is a tubular tubular body and an outer tubular tube 12 that is a second tubular tube into which the inner tubular tube 11 is externally inserted. The drilling bit 4 has been set. On the outer peripheral surface of the inner cylindrical tube 11 and the inner peripheral surface of the outer cylindrical tube 12,
Spline-shaped grooves and ridges parallel to the central axis direction are formed, and these are engaged with each other. A step portion 12a is provided at the front end portion of the outer tube 12, and an annular stopper member 12b is provided at the rear end portion. Between the step portion 12a and the stopper member 12b, the inner cylindrical tube 1
1 and the ridges and grooves of the outer tube 12 are engaged with each other.
The length of the ridges and grooves of the outer cylinder tube 12 is longer than the length of the ridges and grooves of the inner cylinder tube 11 by the dimension L1. Therefore, as shown in FIGS. 3 and 4, the inner tubular tube 11 and the outer tubular tube 12 can slide relative to each other by a dimension L1 in the central axis direction.

However, the tip of the outer tube 12 abuts on the locking portion 7 of the leading conduit 6 so as not to go out, so that the excavation body 8 does not protrude beyond the leading conduit 6 more than necessary. It is configured. Therefore, when the inner tube 3 is moved in the central axis direction, the outer tube 12 is fixed to the locking portion 7 of the leading tube 6, and the inner tube 11 moves with respect to the outer tube 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 excavating bit 4 is swingably provided between the mounting members 13 via a hinge 14. A pressing plate 15 is fixed to the front surface of the attachment member 13 to which the excavation bit 4 is attached by a fixing means such as a bolt so that the excavation bit 4 does not come off from the attachment member 13.

Therefore, the tip of each excavating bit 4 is substantially aligned with the extension surface of the outer peripheral surface of the outer cylindrical tube 12 of the excavating body 8 shown in FIG. It is configured such that it can be opened and closed with respect to the position (excavation position) shown in FIG.

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

Next, as shown in FIGS. 1 and 3, when the inner tubular pipe 11 of the excavation body 8 is pulled to the rear position, the excavation bit 4 falls forward and the tip portion thereof excavates the excavation body 8. Outer tube 12
It comes to the storage position that almost coincides with the extension of the outer peripheral surface.

Then, if the inner tube 3 is pulled rearward as it is,
The entire excavation body 8 including the excavation bit 4 can be withdrawn rearward from the front conduit 6. According to the structure of the propulsion conductor 9 in the present embodiment, the inner cylindrical pipe 11 and the outer cylindrical pipe 12 of the excavated body 8 are formed.
Since the and have a spline structure, the inner cylinder pipe 11 and the outer cylinder pipe 12 are slidable in the central axis direction, and the excavation bit 4 can be opened and closed between the excavation position and the storage position. The excavation bit 4 may be worn during excavation, and in such a case, the excavation bit 4 needs to be replaced. However, in the spline structure of the inner cylinder pipe 11 and the outer cylinder pipe 12 as in this embodiment. According to this, it is possible to pull out and replace the excavation bit 4 even during excavation. Further, since the inner cylindrical tube 11 and the outer cylindrical tube 12 are engaged with each other in the rotating direction and rotate integrally,
The rotational force applied to the inner pipe 3 is changed from the inner pipe 11 to the outer pipe 12.
The drill bit 4 is rotated.

When the drill bit 4 shown in FIGS. 2 and 4 is opened, the tip end of the drill bit 4 coincides with the outer peripheral surface of the lead pipe 6 in the portion where the wall thickness of the lead pipe 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 in the 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 excavating bit 4 rotating along the inner peripheral surface. The outer peripheral locus 16 of is eccentric with respect to the outer peripheral surface. Therefore, if the radius of the outer peripheral locus 16 of the excavation bit 4 is the same as the dimension of the radius of the outer diameter of the leading conduit 6 and the eccentricity δ, it is viewed from the front of the propulsion leading conductor 9 as shown in FIG. Around the tip conduit 6, a portion which is overcut by the drill bit 4 and a portion which is not overcut are formed. As described above, since the eccentric overcut is performed in the propulsion destination conductor 9 of the propulsion device 5 and the press-fit resistance becomes small on the overcut side, the propulsion destination conductor 9 is indicated by the arrow in FIG.
The propulsion direction of 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 of the plate.

The mounting position of the pressing plate 20 on the leading conduit 6 is as shown in FIG. 7 (b). That is,
A 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 wall thickness point is shown, it is less than 90 ° from the 45 ° position measured clockwise from the radius passing through the maximum wall thickness point. There is one pressing plate 20 between the positions. The other pressing plate 20 is 27
It is between the position of more than 0 ° and the position of 315 °. Both pressing plates 20 are provided at positions symmetrical to each other with respect to the diameter connecting the maximum wall thickness point and the minimum wall thickness point of the front conduit 6, and are located closer to the maximum wall thickness 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 the direction in which the pressing plate 20 is not present, as shown in FIG. The propulsion direction of No. 2 is corrected as shown by the arrow in FIG. The correction of the propulsion direction by the pressing plate 20 has the same direction as the direction correction by the eccentric excavation of the excavation bit 4 described above. That is, the excavation bit 4 is overcut on the side of the minimum thickness point of the leading conduit 6, and the pressing plate 20 is provided on the side of the maximum thickness point. Therefore, the press-fitting resistance to the ground on the side of the minimum thickness point that is overcut is reduced, and the pressing plate 20 is pressed from the ground on the side of the maximum thickness point, so that the front conduit 6 is directed to the side of the minimum thickness point. Change the direction of propulsion.

According to the underground propulsion apparatus 1 of this embodiment, a reliable direction correcting action is obtained by the overcut action of the excavating bit 4 in the eccentric tip conduit 6 and the action of the pressing plate 20. Therefore, by changing the position of the front conduit 6 in the circumferential direction as shown in FIG. 8, the propulsion directions of the front conduit 6 and the propulsion pipe 2 continuous with the front conduit 6 can be arbitrarily corrected. Therefore, the propulsion direction can be corrected during propulsion as needed, and the accuracy of the propulsion direction can be improved as compared with the conventional case.

The propulsion pipe 2 is used to correct the propulsion direction.
The means for turning to set the position in the circumferential direction is provided in the propulsion device 5 provided in the starting shaft. Although details will be described later, the accuracy of the propulsion direction is constantly measured during propulsion, and when it is necessary to correct the direction, the entire propulsion pipe 2 is rotated 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 excavation 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. This roller bearing 21 is used for each propulsion pipe 2
And the inner pipes 3 corresponding thereto.

The apparatus of this embodiment has means for supplying the 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-fitting resistance of the propulsion pipe 2. As shown in Figure 1,
An annular packing 22 is provided as a sealing means between the outer peripheral surface of the pipe portion 10 of the excavation body 8 and the propulsion pipe 2. A 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 lubricant replenishing chamber 23.

The pipe portion 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 configured to supply the lubricant into the lubricant replenishing chamber 23. The supply pipe 24 is arranged in the inner pipe 3 and sends out the lubricant from the starting shaft in which 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.
A jetting hole 25 of a lubricant is formed in this. When the lubricant is injected into the lubricant supplement chamber 23 at the same time when the thrust pipe 2 is pressed into the natural ground, the lubricant in the lubricant supplement chamber 23 is jetted out of the thrust pipe 2 through the ejection holes 25. The lubricant jetted out of the propulsion pipe 2 reduces the press-fitting resistance of the propulsion pipe 2.

In the illustrated example, the annular packing 22 has two
Although they are provided side by side, one may be provided. Further, three or more may be arranged to further enhance the sealing property of the lubricant replenishing chamber 23. Further, as shown in FIG. 34, two annular packings 22 are provided behind the roller bearing 21 at a predetermined interval from each other, and both annular packings 22, 2 are provided.
The space defined between the two may be the lubricant replenishing chamber 23. A supply pipe 24 is connected to the lubricant replenishing chamber 23 to supply the lubricant, and the lubricant is ejected to the outside of the propulsion pipe 2 from the ejection hole 25 provided in the propulsion pipe 2 which is the outer wall of the lubricant replenishing chamber 23. Let

In this embodiment, the pipe portion 10 of the excavation body 8 is
Although the lubricant replenishing chamber 23 is provided between the propulsion pipe 2 and the propelling pipe 2, the lubricant replenishing chamber 23 is provided not only in the propulsion pipe at the tip portion but also in the space between the following propelling pipe 2 and the inner pipe 3 with the same structure. It may be provided. In this way, the lubricant can be supplied not only to the propulsion pipe at the tip, but also to the outer peripheral surface of the subsequent propulsion pipes that are connected and propelled one after another and the natural ground, The propulsion resistance of is further reduced.

Further, when the soil to be propelled is like a sandy ground with good water permeability, the sand containing water around the propulsion pipe 2 is dehydrated by the penetration of the propulsion pipe 2, and the dehydrated sand propels the propulsion pipe. The area around 2 is tightened, and a larger thrust is required. If a large tightening force is applied, a phenomenon may occur in which neither press fitting nor pulling back is possible. According to the submersible propulsion apparatus 1 of the present embodiment, since the above-described lubricant supply means is provided, the occurrence of such a problem can be avoided. Therefore, long-distance propulsion with high propulsion direction accuracy becomes possible.

As shown in an enlarged view in FIGS. 3 and 4, a water supply pipe 26 is provided through the outer cylinder pipe 12 of the excavation body 8 in parallel with the central axis, and the front end face of the outer cylinder pipe 12 is provided. Water can be supplied to the drill bit 4 between the mounting members 13 provided. A bellows-shaped expandable pipe 27 is connected to the base end of the water supply pipe 26, and a water supply pipe 28 is connected to the expandable pipe 27. The water supply pipe 28 is arranged in the inner pipe 3 and sends water from the starting shaft in which the propulsion device 5 is installed to the front of the propulsion pipe 2. Even if the inner cylinder pipe 11 having the water supply pipe 28 moves with respect to the outer cylinder pipe 12 having the water supply pipe 26, the water supply pipe 28 and the water supply pipe 26 are the expansion pipes 2
Since they are connected by 7, there is no structural problem.

According to the underground propulsion apparatus 1 of this embodiment, even if the area where the excavation bit 4 is opened or closed is clogged with soil or the like, water can be jetted from the water supply pipe 26 and removed. Therefore, since the excavation bit 4 can be opened and closed smoothly even during the propulsion, the excavation work by the above-mentioned overcut 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 the present embodiment, the water supplied from the water supply pipe 26 cools the excavation bit 4, so that the useful distance of the excavation bit 4 is extended.

5 and 6 show another example of the configuration of the tip portion of the propulsion pipe 2 in this embodiment. In the propulsion method, it is necessary to select and use an excavating bit suitable for the situation of the ground to be promoted. For example, for ordinary ground such as clay, silt, and sand or ground mixed with cobblestone, use a cutting type bit that cuts the ground, and for ground and rock mixed with large gravel, press the bit against the object to crush and crush it. It is preferable to use a crush type bit or a crush type bit.

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

5 and 6, components having the same functions as those in FIG. 1 are designated by the same reference numerals as those in FIG. 1 and their explanations are omitted. The excavation body 8a is inserted in the front conduit 6 in this configuration example. The excavated body 8a has an outer cylinder tube 12, an inner cylinder tube 11, a crush bit 30 and a crush bit 31. The sliding structure of the outer cylinder tube 12 and the inner cylinder tube 11 is the same as that in the above embodiment.

The crushing type bit 31 is fixed to the tip of the outer tube 12. The cleaving 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 tip of the inner tube 11. When the wedge-shaped slider 33 is inserted between the rear end of the holding member 32 of the cleaving bit 30 and the outer tube 12 by moving the inner tube 3 forward, the cleaving bit 30 is The position of the cleaving type bit 30 is fixed to the position outside the leading conduit 6 with the wedge-shaped slider 33 being fully inserted while opening to the outside. By pulling the inner tube 3 back toward the starting shaft, the wedge-shaped slider 33
Is separated from the holding member 32 of the cleaving type bit 30,
The cleaving bit 30 can be tilted toward the central axis of the propulsion tube 2 with the hinge 14 as a fulcrum. If the inner pipe 3 is further pulled back to the starting shaft side, the crushable bit 30 is inserted in the tip conduit 6.
The crush type bit 31 can be stored, and the bit can be exchanged.

According to this structural example, the ordinary ground and the ground mixed with cobblestone can be taken in and discharged from the opening 34 in the excavation body 8a, and the huge gravel that cannot be taken in can be taken in by the crush bit 30 and the crush bit 31. Can be crushed or crushed until. For the bedrock, divide it into small pieces with a crack-type bit 30,
The crushing type bit 31 can be crushed so as to be taken into the opening 34 in the excavation body 8.

Generally, the propulsion service distance of the drill bit 4 is
It is related to the hardness of the object and the time during which the object contacts the excavation bit 4, that is, the cumulative rotation distance of the excavation bit. That is, the higher the hardness of the object and the longer the rotation cumulative distance, the shorter the propulsion service distance of the excavating bit 4. Also, as another cause for shortening the propulsion service distance of the drill bit 4,
The target object may roll in association with the rotation of the excavation bit 4 and directly hit the excavation bit 4 to damage it.

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

Furthermore, if each bit is not firmly fixed to the body of the excavation body and seems to move in small steps as it rotates, not only is the cut in the object poor and the excavation ability is significantly reduced, but it also interlocks with the rotation of the bit. Bits are more damaged depending on the rolling object. In this structural example, the excavated body 8a
Is a double tube structure of an outer cylinder tube 12 and an inner cylinder tube 11, and the inner cylinder tube 1
Since the wedge-shaped slider 33 interlocking with 1 can securely fix the excavation bit, the cut into the object is good and the propulsion service distance is longer than before.

Next, referring to FIGS. 9 to 19, the propulsion device 5 will be described.
Will be explained. The propulsion device 5 in the underground propulsion device 1 is
Mainly, a function of applying a 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 propulsion by rotating the propulsion pipe 2 in the circumferential direction. 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 with concrete or the like. The foundation is provided with a fixing means such as a steel anchor. The base 40 of the propulsion device 5 is fixed to this fixing means. The base 40 is composed of a pair of rail members 41, 41 arranged in parallel at a predetermined interval. Holes 45 are formed at predetermined intervals on the upper surface of each rail member 41 of the base 40.

As shown in FIGS. 9, 11 and 12, a reaction force receiving slider 42 is movably provided on each rail member 41 of the base 40. The reaction force receiving slider 42 is a substrate 43 that moves in contact with the rail member 41.
And a pair of receiving plates 44, 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. The reaction force receiving slider 42
Is set at a position on the rail member 41 such that its hole 46 matches the hole 45 of the rail member 41. Then, the 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. It The fixing pin 47 is inserted and removed by a hydraulic device (not shown).

The propulsion means for applying thrust to the propulsion pipe 2 will be described. As shown in FIGS. 9 to 13, the propulsion means of the present 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 pipe 3 is provided in the center of the push ring 51, and the inner pipe 3 protruding from the rear end of the propulsion pipe 2 is inserted therethrough.

A push wheel 5 corresponding to the upper side of each rail member 41.
Propulsion jacks 52 are horizontally fixed at two positions of 1 respectively. That is, the base end portion of the barrel of the propulsion jack 52 is fixed to the push ring 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 central axis of the propulsion jack 52 and the central 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 push wheel 51 and the push wheel slider 50 are arranged along the base 40 as shown in FIG. You can move forward.

On the front surface of the push wheel 51, there are provided a fixing means for the propulsion tube 2 and a propulsion direction setting means for rotating the fixed propulsion tube 2 and setting it at an arbitrary circumferential position. As shown in FIGS. 17 to 19, a connecting cylinder 61 is rotatably attached to the front surface of the push wheel 51 via a thrust bearing 60. The inner diameter of the connecting tube 61 is larger than the outer diameter of the inner tube 3, and the central axis thereof coincides with the inner tube 3 and the propulsion tube 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 board 62 has an annular shape, 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, on the front surface of the installation board 62, a plurality of tube tightening chucks 63 that are means for fixing the propulsion tube 2 are installed over the entire circumference of the installation board 62. The tube tightening chuck 63 is installed on the installation board 6
2, the jack reaction force base 64 and the slider reaction force base 6 fixed to 2
Have five. The tube tightening chuck 63 includes a hydraulic jack 66 that exerts a tightening 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 the reaction force of the force applied to the tightening slider 67 when the propulsion pipe 2 is fixed.

The tube tightening chucks 63 are provided in several sets (two sets in common with the jack reaction force base 64 as one set (six sets in total in the illustrated embodiment)). In each set, the moving directions of the two tightening sliders 67 are opposite to each other with respect to the circumferential direction of the propulsion tube 2, and approach the outer peripheral surface of the propulsion tube 2 from an oblique direction.

Therefore, according to this fixing means, the tightening slider 67 is unlikely to slip on the outer peripheral surface of the propulsion tube 2, and the propulsion tube 2 is not deformed by tightening. The rear end of the rear part can be tightened uniformly over the entire circumference, and this can be securely and firmly fixed.

When propelling the propulsion pipe 2, the reaction force applied to the propulsion pipe 2 is applied to the installation board 62 of the pipe tightening chuck 63 and is received by the push wheel 51 via the thrust stress bearing 60. The push wheel 51 is the push wheel slider 50 of the propulsion means.
It is one with. Therefore, the propulsion pipe 2 is smoothly propelled without squeaking.

As shown in FIGS. 17 and 18, four rotary jacks 70 (70a, 70a) are provided between the rear surface of the installation board 62 and the front surface of the push wheel 51 as a propelling direction setting means.
b) is provided. The two rotary jacks 70a are in a state in which the rods are contracted, and are installed at two positions that are symmetrical with respect to the central axis of the installation board 62. In these two rotary jacks 70a, the base end side of the barrel is the push ring 5
1 and the tip of the rod is connected to the installation board 62.
8 Rotate counterclockwise in the middle.

The other two rotary jacks 70b have their rods extended and are symmetrical with respect to the central axis of the installation board 62, and the two rotary jacks 70a with respect to the horizontal diameter line of the installation board 62. It is installed in two positions that are symmetrical to each other. In these two rotary jacks 70b, the base end side of the barrel is connected to the push ring 51, and the tip of the rod is connected to the installation board 62. By contracting the rod, the installation board 62 is rotated counterclockwise in FIG. Rotate.

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

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

According to the propulsion direction setting means using the rotary jack 70 as described above, the propulsion pipe 2 can be smoothly rotated even while the propulsion pipe 2 is in the course of propulsion. Further, since the rotation direction can be arbitrarily selected, when returning the propulsion pipe 2 to the original circumferential position, for example, a direction with a short rotation distance can be selected, and the time required for rotation can be shortened.

If the rotating jack 70 is used to rotate the propulsion pipe 2 while propelling the propulsion pipe 2, the tightening resistance of the earth and sand around the propulsion pipe 2 becomes very small, so the rotation of the propulsion pipe 2 is further improved. It will be easier.

As shown in FIG. 17, the push wheel 51 includes
A cooling water injection hole 71 is formed. The water injection hole 71 is opened on the inner peripheral surface of the hole 51 a of the push wheel 51. Water injection hole 7
The cooling water supplied from 1 enters between the outer peripheral surface of the inner pipe 3 which penetrates the hole and the inner peripheral surface of the connecting cylinder 61, and is further supplied between the inner pipe 3 and the propulsion pipe 2 to The roller bearing 21 between the propulsion tubes 2 is cooled.

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

A drive means for rotating the inner pipe 3 will be described with reference to FIGS. 9 to 14. The driving means is the base 4
It has a pair of drive sliders 80, 80 movably provided on each rail member 41 of No. 0. The drive slider 80 is provided between the push wheel slider 50 and the reaction force receiving slider 42. The pair of drive sliders 80, 80 are provided on a common frame 81.

The frame 81 has two main walls 82, 82 which are parallel to a plane orthogonal to the propelling direction and which are spaced apart from each other by a predetermined distance. A hole 82a through which the inner tube 3 can be inserted is provided at the center of each main wall 82. Further, a total of four blades 83 projecting above the rail members 41 are provided on both sides of each of the main walls 82, 82. Each vane 83 has
A hole 83a having a diameter larger than that of the propulsion jack 52 fixed to the push wheel 51 is formed, and the barrel of the propulsion jack 52 is inserted into each vane 83 without coming into contact therewith.

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 interlocking with the drive motor 85 are installed. 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 portion of the unit 7. A chain 90 is wound around 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 protruding 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 propulsion force transmission plate 91 is fixedly provided at the approximate center of the barrel of the propulsion jack 52 fixed to the push wheel 51. The propulsion jack 52 includes a pair of vanes 8 arranged in the propulsion direction on the frame 81.
The propulsive force transmission plate 91 is located between the blade plates 83 and 83, though passing through the holes 83a and 83a of 3,3. The diameter of the propulsion force transmission plate 91 is equal to that of the hole 83 of the blade 83.
It is larger than a. Although the thickness of the propulsion force transmission plate 91 is smaller than the distance between the blade plates 83, at least one propulsion force transmission auxiliary plate 92 and a plurality of propulsion force transmission auxiliary plates 92 are provided between the vane plates 83, 83 and the propulsion force transmission plate 91. A single (three in this embodiment) propulsive force transmission auxiliary plate 93 is interposed without a gap. Therefore, when the propulsion jack 52 operates and moves forward, the propulsion force transmission plate 91 presses the front blade 83 in the same direction via the propulsion force transmission auxiliary plates 92 and 93. As shown in FIGS. 15 and 16, the propulsive force transmission auxiliary plate 92 is substantially U-shaped, and a plurality of (three in this embodiment) pressure gauges 94 are provided inside thereof.

According to the propulsion device 5 of the underground propulsion device 1,
The push wheel slider 50 that propels the propulsion pipe 2 and the drive unit slider 80 that rotates the inner pipe 3 are independent of each other, and the propulsion force of the propulsion jack 52 is generated through the propulsion force transmission plate 91 and the propulsion force transmission auxiliary plate 92. Since it is also transmitted to the side of the pipe 3 and the excavation bit 4, when the propulsion jack 52 propels the propulsion pipe 2, the reaction force applied from the natural ground to the excavation bit 4 at the tip of the inner pipe 3 is generated by the pressure gauge 94. Can be measured.

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

In the construction method in which the propulsion pipe 2 is press-fitted into the ground by the propulsion device 5 in the starting shaft like the subterranean propulsion device 1, press-fitting resistance on the outer peripheral surface of the propulsion pipe 2 and bending of the propulsion pipe 2 are caused. The thrust applied by the propulsion device 5 is not directly transmitted to the excavation bit 4 due to resistance, tightening resistance of sand having good water permeability, and the like.

The longer the propulsion distance, the more difficult it becomes to grasp the propulsive force transmitted to the tip of the excavation bit 4. In the conventional propulsion work, the propulsive force of the propulsion device 5 is determined depending on the intuition of the operator, but it is impossible to confirm whether or not the stress suitable for the excavation object is really applied to the excavation bit 4. It was The excessive propulsive force leads to the loss of the drill bit 4, the deterioration of the propulsion direction accuracy, or the damage of 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. Then, the propulsion jack 52 of the push wheel slider 50 is connected to the propulsion pipe 2
If the propulsive force applied to the is adjusted appropriately based on this measurement,
An optimum excavation stress can always be applied to the excavating bit 4 in use. Therefore, the precision of propulsion and the durability of the drill bit 4 are improved.

Next, the underground propulsion method by the underground propulsion apparatus 1 will be described in the order of steps for each drawing with reference to FIGS. It should be noted that refer to FIGS. 1 to 19 for components that do not appear in FIGS. 20 to 33.

(1) FIG. 20 The propulsion device 5 is lowered in the starting shaft 100, the direction and 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 embedded in the foundation in advance. Base 4
Fix 0. The leading conduit 6 is connected to the tip of the propulsion pipe 2 outside the starting shaft 100, and the pipe portion 1 having the same diameter as the inner pipe 3 is connected to the tip of the inner pipe 3.
A drilling body 8 having a drilling bit 4 and the like attached to the tip of 0 is constructed, and this is inserted into the propulsion pipe 2. This is the starting shaft 1
00, the rear end of the propulsion pipe 2 is fixed by the pipe tightening chuck 63 of the push wheel of the propulsion device 5, and the rear end of the inner pipe 3 is connected to the spindle rod 87. Propulsion tube 2
It is fixed between the wellhead 102 and the push ring 51 in a predetermined direction and gradient. The reaction force receiving slider 42, the push wheel slider 50, and the drive unit slider 80 are set at the rearmost positions.

The wellhead 102 is the starting shaft 10
It is an opening formed on the wall surface of 0 and the set height
The propelling tube 2 is formed in such a size and position that the propelling pipe 2 can penetrate therethrough. Further, a water blocking means having a packing structure is installed at the pit 102 so that water and earth and sand do not flow into the pit through the gap between the pit 102 and the propulsion pipe 2.

(2) FIG. 21 By driving the drive motor 85, the inner pipe 3 and the pipe portion 10 in the propulsion pipe 2 are rotated via the spindle rod 87, and the ground is excavated by the excavation bit 4. At the same time, the driving jack 52 of the push wheel slider 50 is driven, and the push wheel slider 5 is driven.
0 is advanced and the propulsion pipe 2 is pressed into the ground. The drive unit slider 80 connected to the propulsion force transmission plate 91 fixed to the propulsion jack 52 via the propulsion force transmission auxiliary plates 92 and 93 moves following the movement of the push wheel slider 50.
The fixing force 47 received in the reaction force receiving slider 42 in the hole 45 of the base 40 receives the reaction force during the propulsion. When the propulsion jack 52 is fully extended, the propulsion is temporarily stopped, the fixing pin 47 of the reaction force receiving slider 42 is pulled out, and the propulsion jack 5
Degenerate 2. The reaction force receiving slider 42 slides on the base 40 and moves to the front position. The reaction force receiving slider 42 is fixed to the base 40 by the fixing pin 47, and the propulsion tube 2 is repeatedly propelled similarly thereafter.

(3) FIG. 22 The propulsion pipe 2 and the inner pipe 3 connecting the pipe portion 10 are connected to each other by the propulsion device 5
Disconnect from. Push wheel slider 50 / Drive unit slider 80
-Reverse the reaction force receiving slider 42 and set it to the rearmost position. The propulsion pipe 2 with the inner pipe 3 incorporated therein is prepared in advance outside the starting shaft 100. This is put down on the propulsion device 5 in the starting shaft 100, connected to the preceding propulsion pipe 2 and the inner pipe 3, and attached to the propulsion device 5.

(4) FIGS. 23 to 26 and 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 rock mass, and the propulsion pipe 2 is pressed into the rock mass. As shown in FIG. 25, when the pipe tightening 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 the inner pipe 3 are lowered into the starting shaft 100, and this is added to the preceding propulsion pipe 2 and the inner pipe 3 and connected to the propulsion device 5.

Propulsion pipe 2 and inner pipe 3 which are successively added
The length of is not always constant. 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 pipe 2 following the propulsion device 5 in the starting shaft 100 is connected.
And when connecting the inner pipe 3, the inner pipe 3 and the spindle rod 8
The connection space of 7 may be hindered. For example,
On the side where the manufacturing error of the propulsion pipe 2 is long, the space for connecting the inner pipe 3 is insufficient, and on the short side, the space for connecting the inner pipe 3 is excessive.

When the connecting position of the inner pipe 3 is deviated and the space required for connection is excessive or insufficient, the position of the propulsion force transmitting plate 91 of the propulsion jack 52 provided on the push wheel slider 50 side is set to the position of the propulsion force transmitting plate 91. The positions of the pair of blades 83, 83 provided on the drive slider 80 are displaced. In such a case, a proper number of propulsive force transmission auxiliary plates 92 or 93 or the like having a proper thickness may be set between the propulsive force transmission plates 91 and the blade plates 83 between the two plates 91 and 83. Good. In addition, it is desirable that the propulsive force transmission auxiliary plate 92 has one propulsive force transmission auxiliary plate 92 having a built-in pressure gauge. In this way, by using the propulsive force transmission auxiliary plate 92 or 93 or the like, both plates 91, 8
By appropriately setting the interval of 3, even if there is a slight manufacturing error in the axial length of the propelling pipe 2 and the like to be replenished, the connection relationship between the inner pipe 3 and the drive portion slider 80 is disturbed. Instead, the thrust force of the push wheel slider 50 is reliably transmitted to the drive slider 80.

Further, according to the present propulsion device 5, the reaction force applied to the excavation bit 4 from the ground at the tip of the inner pipe 3 is started by the pressure gauge 94 of the propulsion force transmission auxiliary plate 92 on the starting shaft 10
It can be measured within 0. Then, the push wheel slider 5
If the propulsive force applied to the propulsion pipe 2 by the 0 propulsion jack 52 is appropriately adjusted based on this measurement, the drilling bit 4 in use
Optimum excavation stress can always be given to. Therefore,
The accuracy of propulsion and the durability of the drill bit 4 are improved. Also,
Since the ground propulsion device 1 has the means for supplying the lubricant to the propulsion conductor 9, the propulsion resistance between the propulsion pipe 2 and the ground is significantly reduced. Therefore, long-distance propulsion with high propulsion direction accuracy becomes possible.

(5) FIG. 27 The propelling tip conductor 9 at the tip of the propulsion pipe 2 is propelled until it penetrates the reaching shaft 103. During the propulsion, the earth and sand excavated by the excavation bit 4 is taken into the inner pipe 3. The inner surface of the inner tube 3 is provided with earth and sand guiding means in which a cord-shaped or strip-shaped steel material is spirally arranged. The earth and sand taken into the inner pipe 3 is started upright 100 by the guiding means which rotates together with the inner pipe 3.
And is discharged to the outside from the inner pipe 3.

(6) FIG. 28 The leading conduit 6 provided with the pressing plate 20 is recovered at the reaching shaft 103. The excavation bit 4 and the inner pipe 3 are pulled back to the starting shaft 100 and are 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 of exchanging the excavation bit 4 during the propulsion will be described with reference to FIGS. 29 to 31.

(7) FIG. 29 FIG. 29 shows a state in which normal propulsion is being performed by the underground propulsion apparatus 1 and method of this embodiment. Generally, in long-distance propulsion, it becomes difficult to grasp the thrust at the tip of the excavation bit 4. However, according to this embodiment, the push wheel slider 50 for propelling the propulsion pipe 2 and the drive section slider 80 for rotating the inner pipe 3 are independent of each other, and the propulsive force by the propulsion jack 52 is the same as that of the inner pipe 3 and the excavating bit 4. When the propulsion jack 52 propels the propulsion pipe 2, the reaction force applied from the natural ground to the excavation bit 4 at the tip of the inner pipe 3 is transmitted between the push wheel slider 50 and the drive portion slider 80. It can be measured by the mounted pressure gauge 94.

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

(8) FIG. 30 When the damage of the excavation bit 4 is detected from the detection value of the pressure gauge 94 or the type of the ground to be excavated is changed, the countermeasure is taken. Then 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 tubular pipe 11 and the outer tubular pipe 12 of the excavation body 8 are meshed with each other in a spline structure, and the inner tubular pipe 11 is oriented in the central axis direction. The outer tube 12 is slidable. Therefore,
By pulling the inner pipe 3 as described above and pulling back the inner tubular pipe 11 that was pushing the excavation bit 4, the excavation bit 4 can be closed from the excavation position to the storage position. Therefore, the outer cylinder tube 12 to which the excavation bit 4 is attached can be drawn into the propulsion tube 2.

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

Next, in the underground propulsion method by the underground propulsion apparatus 1, a process for correcting the direction during the propulsion will be described with reference to FIGS. 32 and 33.

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

(11) FIG. 33 During the propulsion, the propulsion direction is regularly measured. When it is determined that an error that should be corrected in the propulsion direction has occurred, the propulsion direction is corrected. That is, in parallel with the propulsion of the propulsion pipe 2, the whole of the propulsion pipe 2 in the ground is rotated by the rotating jack 70 which is the propulsion direction setting means, and the pressing plate 20 on the outer peripheral surface of the tip conduit 6 is rotated in the circumferential direction. Set it to the desired position. Then, the propulsion is continued and the propulsion direction of the propulsion pipe 2 is guided to a desired direction to correct the direction.

The propulsion pipe 2 which is buried in the ground by the above steps and penetrates between the starting shaft 100 and the reaching shaft 103.
Can be used as a water supply pipe, a sewer pipe, a gas pipe, a sheath pipe for laying an electric / communication cable, or the like. Other applicable applications include a replacement method for an existing pipe and a pipe roof method.

[0108]

According to the underground propulsion device and the underground propulsion method using the same of the present invention, the stress applied to the excavation bit can be detected, and the excavation bit is placed inside the propulsion pipe as necessary. It can be pulled in from the start pit and replaced.

Therefore, in the apparatus and method of the present invention, if excavating bits are replaced according to the progress of abrasion of excavating bits or the type of ground encountered, efficient and highly accurate underground propulsion is possible. Since the construction method can be performed, excessive wear and damage of the drill bit are less likely to occur, and the accuracy of the propulsion direction is improved, and the effect of improving the functionality of the propulsion method and increasing industrial convenience is obtained. To be

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure near a tip of a propulsion pipe 2 in an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure in the vicinity of the tip of a propulsion pipe 2 in one embodiment of the present invention, showing a state in which a drill bit 4 is set at a drilling position.

FIG. 3 is an enlarged cross-sectional view showing the structure in the vicinity of the tip of the propulsion pipe 2 in the embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view showing the structure in the vicinity of the tip of the propulsion pipe 2 in one embodiment of the present invention, showing a state in which the excavation bit 4 is set at the excavation position.

FIG. 5 is a cross-sectional view showing another structural example in the vicinity of the tip of the propulsion pipe 2 in the embodiment of the present invention.

FIG. 6 is a cross-sectional view showing another structural example in the vicinity of the tip of the propulsion pipe 2 in the embodiment of the present invention.

FIG. 7 (a) is a front view showing the structure of the leading conduit tube 6 in one embodiment of the present invention, and FIG. 7 (b) is a side view of the same.

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

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

FIG. 10 is a plan view showing the structure in the vicinity of the propulsion device 5 according to the embodiment of the present invention.

11 is a half cross-sectional view taken along the line AA of FIG.

12 is a cross-sectional view taken along the line BB of FIG.

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

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

FIG. 15 is a sectional view of a propulsive force transmission auxiliary plate 92 in one embodiment of the present invention.

16 is a cross-sectional view taken along the line D-D in FIG.

FIG. 17 is a cross-sectional view showing the structure in the vicinity of the push ring 51 in one embodiment of the present invention.

18 is a cross-sectional view taken along the line EE of FIG.

19 is a cross-sectional view taken along the line FF of FIG.

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

FIG. 21 is a process drawing of an underground propulsion method using the underground propulsion device 1 in an example of the present invention.

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

FIG. 23 is a process drawing of an underground propulsion method using the underground propulsion device 1 in an example of the present invention.

FIG. 24 is a process diagram of an underground propulsion method using the underground propulsion device 1 in an example of the present invention.

FIG. 25 is a process drawing of an underground propulsion method using the underground propulsion device 1 in an example of the present invention.

FIG. 26 is a process drawing of an underground propulsion method using the underground propulsion device 1 in an example of the present invention.

FIG. 27 is a process drawing of an underground propulsion method using the underground propulsion device 1 in an example of the present invention.

FIG. 28 is a process drawing of an underground propulsion method using the underground propulsion device 1 in an example of the present invention.

FIG. 29 is a process drawing of an underground propulsion method using the underground propulsion device 1 in an example of the present invention.

FIG. 30 is a process drawing of an underground propulsion method using the underground propulsion device 1 in an example of the present invention.

FIG. 31 is a process diagram of an underground propulsion method using the underground propulsion device 1 in an example of the present invention.

FIG. 32 is a process drawing of an underground propulsion method using the underground propulsion device 1 in an example of the present invention.

FIG. 33 is a process diagram of an underground propulsion method using the underground propulsion device 1 in an example of the present invention.

34 is a cross-sectional view showing another aspect of the structure near the tip of the propulsion pipe 2 in the embodiment shown in FIG. 1. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground propulsion device 2 Propulsion pipe 3 Inner pipe 4 Excavation bit 6 Leading conduit 8 Excavated body 10 Pipe part 11 Inner cylinder pipe as a first cylinder pipe forming a cylinder pipe part 12 Second cylinder forming a cylinder pipe part Outer cylinder tube 20 as a cylinder tube 20 Pressing plate 22 Annular packing as a partitioning means 23 Lubricant replenishing chamber 24 Supply pipe constituting a supply means 25 Jet hole which is a lubricant supply hole 30 Crush-type bit as a drill bit 31 Crushing type bit as excavation bit 40 Base 50 Pushing wheel slider 52 constituting propulsion means 52 Propulsion jack 70 constituting propulsion means 70 Rotating jack 80 as propulsion direction setting means 80 Drive unit slider 85 Comprising drive means Drive motor 94 Pressure gauge as pressure detecting means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Fujio Seya 1-21-20 Izumigaoka, Iwaki City, Fukushima Prefecture (72) Inventor Shuichi Ishikawa 4-3-1 Nishioginami, Suginami-ku, Tokyo (72) Inventor Kameyama Tetsuo 488-2 Kamabazu, Mibashi Town, Sanmon District, Fukuoka Prefecture

Claims (10)

[Claims] 1. A propulsion pipe that is press-fitted into the ground, an inner pipe that is inserted into the propulsion pipe and rotates, an excavation position for excavating in front of the propulsion pipe, and a storage that is stored inside the propulsion pipe. An underground propulsion device having an excavation bit provided at a tip portion of the inner pipe so as to be movable to and from a position. 2. A propulsion pipe that is press-fitted into the ground, an inner pipe that is inserted into the propulsion pipe to rotate, and a tip portion of the inner pipe that is provided at the tip of the inner pipe. An underground propulsion device comprising a drill body that is rotated in front of a pipe and that stores the drill bit inside the propulsion pipe by retracting the inner pipe when exchanging the drill bit. 3. A propulsion pipe that is press-fitted into the ground, an inner pipe that is inserted into the propulsion pipe to rotate, a first cylindrical pipe provided at a tip portion of the inner pipe, and a predetermined axial range. A second tubular tube coaxially provided with the first tubular tube so as to be movable in the first tubular tube and rotating in the circumferential direction integrally with the first tubular tube in the propulsion tube; and the second tubular tube. It is swingably provided at the tip of the pipe, and is pressed by the tip of the first tubular pipe that has moved in the axial direction to be set at a digging position for digging ahead of the propulsion pipe and when excavating a bit. An underground propulsion device having a drill bit that is pulled into a storage position inside the propulsion pipe by retracting the inner pipe. 4. The underground propulsion device according to claim 3, further comprising means for injecting water from the tip portion of the second cylindrical pipe to the excavation bit. 5. The ground propulsion device according to claim 3, wherein the excavating bit is a cleaving type bit. 6. The underground propulsion device according to claim 5, wherein a crushing type bit is fixedly provided at a tip portion of the second cylindrical pipe. 7. A propulsion pipe which is press-fitted into the ground, an inner pipe which is inserted into the propulsion pipe to rotate, a first cylindrical pipe provided at a tip end portion of the inner pipe, and a predetermined axial range. A second tubular tube coaxially provided with the first tubular tube so as to be movable in the first tubular tube and rotating in the circumferential direction integrally with the first tubular tube in the propulsion tube; and the second tubular tube. It is swingably provided at the tip of the pipe, and is pressed by the tip of the first tubular pipe that has moved in the axial direction to be set at a digging position for digging ahead of the propulsion pipe and when excavating a bit. An excavation bit that is drawn into a storage position inside the propulsion pipe by the drawing of the inner pipe, a base, and movably provided with respect to the base,
Propulsion means for fixing the rear end of the propulsion tube to apply a propulsive force to the propulsion tube, and movably provided with respect to the base, to give a rotational force to the inner tube and to be pressed by the propulsion means. An underground propulsion device having a drive means. 8. The underground propulsion apparatus according to claim 7, further comprising a pressure detection unit that detects a thrust force at the tip of the excavation bit. 9. The underground propulsion method using the underground propulsion device according to claim 3, wherein the excavation is stopped during the excavation and the inner pipe is pulled back in a direction opposite to the propulsion direction, and the excavation bit is moved to the direction of the propulsion pipe. An underground propulsion method characterized in that the excavation is restarted by retreating the excavation by retracting the propulsion pipe together with the inner pipe by pulling it out from the rear end of the propulsion pipe together with the inner pipe. 10. The underground propulsion method using the underground propulsion device according to claim 8, wherein the excavation is stopped during the excavation in accordance with the thrust value at the tip of the excavation bit detected by the pressure detection means, and further, The inner pipe is pulled back in the direction opposite to the propulsion direction, the excavation bit is drawn inside the propulsion pipe, the inner pipe and the rear end of the propulsion pipe are pulled out, and after exchanging, the excavation bit is inserted again into the propulsion pipe to restart excavation. A characteristic underground propulsion method.