JP2019152033A - Joint for connecting body, digging apparatus, and digging method - Google Patents

Abstract

To provide a joint for a connecting body that transmits a rotational force and a feeding force of a drive-side connecting body without bending the entire connecting body, and can dig with good straightness when the drive-side connecting body is connected to a dig-side connecting body in the present invention, and a digging apparatus and a digging method having a connecting body using the joint.SOLUTION: A joint 10 of a connecting body comprises a male mold 12 having a polygonal column disposed on one connecting body 11 among a dig-side connecting body 11 and a drive-side connecting body 21 that transmits a rotational force and a feeding force to the dig-side connecting body 11, a female mold 22 having a space 22SP in which the male mold 12 of the polygonal column disposed on the other connecting body 21 is fitted, and a fastening portion 31 that tightens both connecting bodies 11, 21 in close contact with the position on outer peripheral surfaces 11S, 21S where both connecting bodies 11, 21 are joined together and the outer peripheral surface in front of and behind that position with the male mold 12 fitted into the female mold 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coupling body joint, a digging apparatus and a digging method in which the coupling body is coupled using the coupling body.

  The technique of continuously digging in the horizontal direction under the surface of the earth is used for boring for the purpose of geological surveys, including the installation of electricity, gas, and water and sewage pipes. Normally, all drilling operations such as various types of boring (investigation, resource exploration), laying civil engineering piles, soil improvement, etc., are linked sequentially according to their depth. The work process of adding is generated. For example, in most horizontal excavation technologies except for shield machines used for tunnel construction, a drive-side coupling body that provides the rotational force and feed force of the drive unit to the excavation-side coupling body with a bit at the tip. By connecting, the length of the connected body is extended. In this specification, the side where the bit is arranged from the connecting position of the connecting body is called the excavation side, and the side where the driving device for driving the connecting body is arranged is called the driving side. Further, the long-distance hole is dug by sequentially connecting the drive side coupling bodies. One of the important points in such excavation technology is excavation in a straight line toward the target point, which requires several factors.

One of them is to ensure the linearity of the connected connected body at the connecting portion of the connected body. The linearity (also referred to simply as linearity) of the connected body means that the connected body is connected in a straight line without bending at the connection position with respect to the connected body.
The following four types of connecting methods are generally used.
(1) It connects by joining with a screw (refer patent document 1).
(2) The connection fitting portion has a circular cross section, and the connection by the pin is also performed at the same time.
(3) The connection fitting part has a polygonal cross section, and the connection by a pin is also performed simultaneously (see Patent Document 2).
(4) The connecting portion is welded to form an integral structure.
Of the connection methods (1) to (4), the method (3) is often used from the viewpoint of manufacturing cost and operation, except for excavation surveys that excavate long holes.

Japanese Patent Laid-Open No. 7-208052 JP 2011-174355 A

However,
(1) In the digging technique of Patent Document 1, since the connection between the connected bodies is a connection by screws, the alignment of the male screw and the female screw is important. For this reason, special equipment may be required to connect the connected bodies, and the connection often takes time. In addition, since the processing of the screw requires processing accuracy, the manufacturing cost increases. Furthermore, in order to avoid crushing the screw thread, it is necessary to be more careful than other methods during transportation and storage.
(2) In the connection method in which the connecting portion by fitting has a circular cross section, attention must be paid to the fitting of the circular cross section at the time of connection. Further, since the pin is used for transmitting the rotational force and the feeding force, the size of the excavation diameter is determined by the strength of the pin. Therefore, it is not suitable for transmission of high turning power and high driving force.
(3) In the coupling method in which the coupling portion by fitting has a polygonal cross section, the rotational force is transmitted by all the sides of the male section of the polygonal section to be fitted, which is advantageous for transmission of high rotational power. Become. However, it is difficult to align the cores when connecting them. Therefore, in order to facilitate alignment, a certain amount of clearance is inevitably required at the connecting portion by fitting between the male mold and the female mold. However, the clearance causes so-called “backlash”, and the linearity of the connected body connected at the connecting portion of the connected body is impaired. Further, when high accuracy is required for processing a male die having a polygonal cross section, the manufacturing cost increases.
(4) In the connection body in which the connection portion of the connection body is welded, an operation of separating the welded portion occurs when the connection body is recovered after the excavation is completed. Therefore, work man-hours increase with the welding work at the time of connection. Also, in a work environment where fire is strictly prohibited such as in a tunnel, welding work cannot be performed, so that the separation work cannot be performed.

In the excavation in the vertical direction, the deviation in linearity due to the clearance is almost acceptable, but the deviation in linearity becomes a serious problem when the excavation direction is close to horizontal.
In other words, when the digging-side coupling body is not linearly coupled to the driving-side coupling body, the plurality of coupled coupling bodies are gently tilted vertically with respect to the digging direction. As a result, an arc-shaped hole is excavated.
Even when the connected bodies are connected horizontally and the connected connected bodies are connected in a straight line with good linearity, the entire connected body bends downward (vertical direction) due to its own weight. Or when there is an obstacle in the traveling direction, the connecting body tends to bend from the connecting portion in a direction to avoid the obstacle.
Further, as the number of connecting portions increases, the linearity deviation of the entire connecting body increases and the amount by which the end portion of the connecting body on the excavation side descends increases. For example, considering that the male mold disposed on the digging-side coupling body is fitted into the female mold disposed on the driving-side coupling body, considering that the lower side of the male mold is in contact with the female mold wall surface, Due to the clearance, the male mold receives a downward force due to the weight of the linking body on the excavation side. Therefore, it is inevitable that the connecting body on the excavation side is inclined downward with respect to the excavation direction.

Eliminating the above is an important factor for ensuring the linearity of the entire connected body.
As one means for ensuring the linearity of the coupling body, it is important to eliminate the clearance at the fitting portion between the male mold and the female mold as much as possible and to eliminate the downward bending of the coupling body itself.
As a result of intensive studies, the present inventors have selected and used the excavation method, excavation depth, and the elements of the existing coupling body to obtain the turning power and the feeding force, and the linearity of the coupling body. It was found that securing of

  In the present invention, when the driving-side coupling body is connected to the digging-side coupling body, the entire coupling body has good linearity, and the driving force and the driving force of the driving-side coupling body are transferred to the digging-side coupling body. An object of the present invention is to provide a coupling joint that allows transmission and excavation with good straightness. Moreover, it is providing the excavation apparatus and the excavation method which have a connection body using the coupling.

In order to improve the straightness of the connecting body on the excavation side, the present inventors have improved the connectivity of the joint between the connecting body on the excavation side and the connecting body on the driving side, so that the joint of the connected body has excellent straightness. I found. The present invention has been further studied based on this finding and has been completed.
That is, the said subject of this invention was solved by the following means.
[1]
Of the coupling body on the digging side and the driving side coupling body that transmits the rotational force and the feeding force to the digging side coupling body, the male model of the polygonal column arranged on one coupling body, and the other coupling body A female mold having a space in which the male mold of the polygonal column arranged in
In the state in which the male mold is fitted to the female mold, the position of the both connecting bodies connected to each other on the outer peripheral surface and the connection position are in close contact with the outer peripheral surface on the digging side and the driving side. A coupling joint with a fastening part that tightens the body.
[2]
Of the coupling body on the digging side and the driving side coupling body that transmits the rotational force and the feeding force to the digging side coupling body, the male model of the polygonal column arranged on one coupling body, and the other coupling body A female mold having a polygonal column type space into which the male mold of the polygonal column arranged in
A male column having a cylindrical shape disposed in either one of the coupling bodies, and a female mold having a cylindrical space in which the male mold of the column is fitted, disposed in a coupling body on which the male mold of the column is not disposed. A coupling joint comprising:
[3]
3. The coupling body according to claim 2, wherein the male mold of the polygonal column is disposed on a bottom surface of the female mold having the cylindrical space, and the female mold having the polygonal column space is disposed on the male mold of the column. Fittings.
[4]
The male mold of the polygonal column is disposed on the front end surface of the male mold of the cylinder, and the female mold having the polygonal column space is disposed on the bottom surface of the female mold having the columnar space. Connected joint.
[5]
A digging apparatus for digging by sequentially adding a driving-side coupling body that transmits rotational power and a feeding force to the digging-side coupling body to a digging-side coupling body having an excavation head disposed at the tip,
The excavation apparatus which has the joint of the connection body of any one of Claims 1-4 in the connection body of the said excavation side, and the connection body of the said drive side.
[6]
5. A drive-side coupling body that sequentially transmits the turning force and the feeding force to the digging-side coupling body is sequentially added to the digging-side coupling body by the coupling body coupling according to any one of claims 1 to 4. The method of digging.

  According to the joint of the coupling body of the present invention, when the driving side coupling body is coupled to the excavation side coupling body, the linearity of the entire coupling body is improved, and the rotational power and supply of the driving side coupling body are improved. It is possible to excavate with good straightness by transmitting the advance force to the connecting body on the excavation side. Further, according to the excavation apparatus and the excavation method using this joint, the linearity of the entire connecting body is improved, and the rotational force and the feeding force of the driving-side connecting body are transmitted to the excavating-side connecting body, so that the straightness is improved. It becomes possible to dig well.

(A) The figure is a sectional view of the connecting body longitudinal direction which showed the outline of one preferred embodiment (1st embodiment) of the joint of the connecting object concerning the present invention, and (B) figure is A of Drawing 1. It is the longitudinal cross-sectional view which showed the -A cross section. It is sectional drawing which showed an example of how to obtain | require clearance. (A) The figure is sectional drawing of the coupling body longitudinal direction which showed the outline of preferable one Embodiment (2nd Embodiment) of the coupling of the coupling body which concerns on this invention, (B) A figure is FIG. It is the longitudinal cross-sectional view which showed the BB line cross section of). FIG. 2A is a cross-sectional view in the longitudinal direction of a connector showing an outline of a preferred embodiment (second embodiment) of the joint of the connector according to the present invention. (B) is a longitudinal sectional view showing a section taken along the line CC in FIG. 4 (A), and (C) is a longitudinal sectional view showing a section taken along the line DD in FIG. 4 (A). is there. It is the front view which showed the outline of preferable one Embodiment of the excavation apparatus which concerns on this invention.

  A preferred embodiment (first embodiment) of a coupling joint according to the present invention will be described below with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the coupling body joint 10 (10 </ b> A) connects the digging-side coupling body 11 and the driving-side coupling body 21 that transmits the rotational force and the feeding force to the digging-side coupling body 11. It is a joint to do. “Turning power” is a force that rotates the connecting body on the excavation side around the axis. “Feeding force” is a force that pushes the distal end portion (also referred to as an excavation head, an excavation bit, or the like) of the coupling body on the excavation side into an object to be excavated such as the ground. It is preferable that the digging-side connecting body 11 and the driving-side connecting body 21 are formed of connecting pipes for weight reduction. The connecting pipe is preferably composed of a steel pipe, a stainless steel pipe or the like.

As one coupling body, for example, a polygonal male mold 12 is arranged on the driving side end surface 11A of the coupling body facing the driving side. Hereinafter, the surface facing the drive side is referred to as the drive side surface, and the surface facing the excavation side is referred to as the excavation side surface. For example, “digging side end face” means an end face facing the digging side. The male mold 12 and the connecting body 11 are arranged so that the central axes C ₁₂ and C ₁₁ coincide with each other. In this embodiment, as an example, a male hexagonal prism is arranged. Preferred examples of the polygonal column include regular polygonal columns such as a regular quadrangular column, a regular hexagonal column (illustrated example), and a regular octagonal column. By using a regular polygonal column, the rotational force is evenly applied to each side surface.
When the cross section of the male mold 12 is a regular polygon, the size of each side surface 12S of the male mold 12 is the same, and the size of each side surface 22S (contact surface) of the female mold 22 that contacts each side surface 12S of the male mold 12 is the same. The same is true. Therefore, the force transmitted from the male mold 12 to the female mold 22 or from the female mold 22 to the male mold 12 is evenly distributed on each side surface.
On the other hand, when the male cross section is not a regular polygon, the sizes of the side surfaces are different. Therefore, the force is not evenly distributed on each side surface, and the force transmitted from the male mold to the female mold or from the female mold to the male mold is large or small. In such a case, on the excavation side and the drive side, the shape and material must be taken into account depending on the magnitude of the force. Regarding the shape, the shape may be unsuitable for use in a rotating body (for example, a polygon having a flat cross section). Therefore, regarding the material, it is preferable to use a material that is stronger than the male mold 12 having a regular polygonal cross section. When the same material as the male mold 12 having a regular polygonal cross section is used, the joint mechanism itself is increased in size.

As the other connecting body, the driving-side connecting body 21 is provided with a female mold 22 having a space 22SP (polygonal column type space) in which the male column 12 of the polygonal column is fitted at the end thereof. “Fitting” means that the male mold 12 is fitted into the female mold 22 so as to fit closely. However, the female mold 22 has a clearance (not shown) necessary for fitting the male mold 12 into the female mold 22.
The thickness D ₂₁ of the female die 22 has a thickness that does not deform when it is rotated so as to transmit the rotational force to the male die 12 having a polygonal column. The thickness D ₂₁ is, for example, the average thickness of the one side wall surface of the male 12 fits polygonal prism space polygonal. The thickness D ₂₁ is possible to calculate the strength of materials, the structural mechanics. In the case of a regular polygonal column, the value obtained by dividing all the rotational forces by the number of side surfaces of the regular polygonal column is the transmission rotational force on one side. Here, the surface pressure (force applied per unit area) on one side surface is preferably less than the allowable value of the material.
In addition, since all of the rotational force is transmitted, it is preferable to calculate the strength against the torsion of the hollow section having a regular polygon and the outer diameter of the cylindrical section, and the balance with the material. Each allowable value is not the maximum value of material strength, and it is preferable to consider a general safety factor.

As shown in FIG. 2, clearance refers to a gap between the male mold 12 and the female mold 22 when the male mold 12 is fitted into the female mold 22. That is, it refers to the gaps D1 to D6 (in the case of a male hexagonal column) between each side surface 12S of the polygonal column of the male mold 12 and the side surface 22S of the female mold 22 facing each side surface 12S. The lengths of the gaps D1 to D6 are the shortest distance and the longest distance in the direction perpendicular to the side surface 12S of the male mold 12 (or the side surface 22S of the female mold) in the distance between the opposing side surfaces of the male mold 12 and the female mold 22. The average value. When the male mold 12 is a hexagonal column and the side surface 12S of the male mold 12 and the side surface 22S of the female mold 22 facing the male mold 12 are in parallel positions, the clearance is an average value of the intervals Dt1 to Dt6 of the gaps D1 to D6. .
Specifically, the clearance is usually 0.2 mm to 2 mm, preferably 0.2 mm to 1 mm, and more preferably 0.2 mm to 0.4 mm.

  Further, it is preferable that the end surface 12 </ b> A of the male die 12 is pressed against the bottom surface 22 </ b> B of the female die 22 in a state where the male die 12 is fitted into the female die 22. With such a configuration, it becomes easy to transmit the feeding force from the driving-side connecting body 21 to the digging-side connecting body 11. From the same viewpoint, it is preferable that the digging side end surface 21A of the female die 22 and the driving side end surface 11A around the male die 12 are in contact with each other. Further, in order to easily fit the deep part of the female mold 22, it is preferable that chamfering (not shown) is made around the male end face 12 </ b> A. The chamfer may be a round chamfer, a 45 degree chamfer, or another chamfer.

  It is preferable that the male mold 12 has a cavity (not shown) therein for weight reduction within a range in which shear strength is maintained in a state where the male mold 12 is fitted into the female mold 22.

The fastening portion 31 is a state where the male mold 12 is fitted into the female mold 22, and the coupling position C1 on the outer peripheral surface where both the coupling bodies 11 and 21 are coupled to each other and the digging side and the driving side with the coupling position C1 as a boundary. Are closely attached to the outer peripheral surfaces 11S and 21S, and both the coupling bodies 11 and 21 are tightened. Specifically, the fastening portion 31 includes a first fastening portion 31A and a second fastening portion 31B. 31 A of 1st fastening parts are extended in the width direction both sides of the 1st clamping part 32A of the shape where the inner surface curved, and the 1st clamping part 32A so that the upper half of the outer peripheral surface of both the coupling bodies 11 and 21 may be followed, for example. Collar portions 33A, 34A. Similarly, the 2nd fastening part 31B is the width direction of the 2nd fastening part 32B of the shape where the inner surface curved, for example along the lower half of the outer peripheral surface of both the coupling bodies 11 and 21, and the 2nd fastening part 32B. It has collar parts 33B and 34B extended on both sides. However, the first and second fastening portions 32A and 32B have a thickness that can withstand the tensile stress generated by fastening.
In a state where the first and second fastening portions 31A and 31B are attached to the coupling bodies 11 and 21, a gap 35S between the flange portions is provided between the flange portions 33A and 33B and between the flange portions 34A and 34B, respectively. Preferably 36S occurs. It is preferable that the lengths of the first and second tightening portions 32A and 32B in the bending (width) direction are set so that the gaps 35S and 36S between the flange portions are generated. By having the gaps 35S and 36S, the coupling bodies 11 and 21 can be firmly fastened by the first and second fastening portions 31A and 31B. The gaps 35S and 36S are preferably 5 mm or more and 15 mm or less, more preferably 5 mm or more and 15 mm or less, and further preferably 5 mm or more and 8 mm or less.

The flange portions 33A and 33B and the flange portions 34A and 34B are provided with holes 35A, 35B, 36A, and 36B through which bolts for fastening are provided at a plurality of locations on one side.
Further, a bolt 37A and a nut 38A are provided as fastening means for fastening the collar portion 33A and the collar portion 33B. Similarly, a bolt 37B and a nut 38B are provided as fastening means for fastening the collar portion 34A and the collar portion 34B. Note that washers 39A and 39B may be disposed on the respective fastening means.

As shown in FIG. 1, the length of the fastening part 31 is the outer peripheral surface 21S of the connecting body 21 in the portion where the female mold 22 is arranged and the outer peripheral surfaces of the connecting bodies 11 and 21 on the digging side and the driving side. It is preferable to be arranged so as to cover 11S and 21S. Here, “before and after” also has the same meaning as described above. Specifically, the fastening portion 31 has a clearance (not shown) between the male mold 12 and the female mold 22 such that the digging side of the linking body 11 on the digging side is lowered with the female end 22P as a fulcrum. Arranged to prevent falling. That is, the portion of the fastening portion 31 that covers the drive-side coupling body 21 is used as a support portion, and the portion where the fastening portion 31 covers the digging-side coupling body 11 prevents the digging-side coupling body 11 from being inclined by the clearance. The length can be fixed to the support side and the tightening force.
Since the purpose is to integrate the digging-side connecting body 11 and the driving-side connecting body 21 by the fastening portion 31, it is not necessarily simply fastened, and the bolts 37A and 37B to be tightened are not necessarily required. Consideration must be given to the size, number and tightening force. Further, the longer the covering distance to both the fastening portions 31, the more reliable the integration becomes. Therefore, it is effective to take as long as possible. The length of the fastening portion 31 is determined by the clearance between the male mold 12 and the female mold 22 that is not constricted at the connecting portion between the male mold 12 and the female mold 22 and the generated vibration when driven. It is desirable that no looseness occurs.
The bolt size is preferably a shape (size) that can reliably hold the weight generated by the tools (digging-side and drive-side coupling bodies 11 and 21) and that does not loosen due to vibration.
It is preferable that three bolts are arranged linearly at equal intervals. Also, if the bolts are not arranged linearly or if three bolts are not arranged on one side, the force that each bolt bears will be different even if the tightening force is uniform, which may cause looseness and fatigue. Get higher. The tightening force depends on the general tightening force of the bolt.
The longer the covering distance of the fastening portion 31 is, the more effective, but it is preferable to set the length in consideration of a general bolt interval in bolt fastening.

  The fastening portion 31 is brought into close contact with the connecting position C1 on the outer peripheral surface where both the connecting bodies 11 and 21 are connected to each other and the outer peripheral surfaces 11S and 21S before and after the connecting position C1, so that the collar portions 33A, 33B, 34A, 34B can be tightened. Since the tightening form is such that it is tightened using a two-piece band, the coupling bodies 11 and 21 can be tightened evenly and firmly. Moreover, the first and second fastening portions 32A and 32B have a thickness that can withstand the fastening. From this, even if there is a clearance between the female mold 22 and the male mold 12, the opening end 22P of the female mold 22 is a fulcrum with respect to the drive-side coupling body 21, and the digging-side coupling body 11 is used. Is suppressed from falling in the vertical direction. Therefore, the connecting body 11 on the excavation side and the connecting body 21 on the driving side are linearly connected. In addition, when the coupling body on the driving side is sequentially coupled using the joint 10A, the entire coupled body is coupled in a straight line. In this way, the clearance for fitting the male mold having a polygonal cross section can be substantially eliminated, and the bending of the entire connecting body can be suppressed. For this reason, it becomes possible to dig with good straightness.

Furthermore, since the male die 12 having a polygonal cross section is fitted into the female die 22 having a space 22SP in which the male die 12 is fitted, the rotational force transmitted from the connecting member 21 on the driving side is reliably dug without attenuation. It can be transmitted to the connecting body 11 on the side. Furthermore, since the digging-side coupling body 11 and the driving-side coupling body 21 are fixed to each other by the fitting of the male mold 12 to the female mold 22 and the fastening by the fastening portion 31, the feeding force is also reliably increased on the driving side. Can be transmitted from the connecting body 21 to the connecting body 11 on the excavation side.
In other words, while achieving both the transmission performance of the rotational force and the transmission performance of the feeding force, even if the drive-side coupling body is sequentially added, the arrangement of the coupled coupling body will not deviate from the straight line. For example, it is possible to dig a long hole in the horizontal direction without impairing the linearity in the digging direction.

In the connecting bodies 11 and 21, in the connecting body longitudinal direction of the connecting portion C <b> 1, the fastening portion 31 covers a portion in which the male cylinder 12 of the polygonal column is fitted into the female mold 22 having the space (polygonal column type space) 22 </ b> SP. Tightened. Therefore, when the female mold 22 is rotated, the force to expand the space (polygonal column space) 22SP of the female mold 22 is suppressed by the male mold 12 of the polygonal cylinder, and the coupling body 21 on the driving side is surely connected. The turning force can be transmitted to the connecting body 11 on the excavation side. Moreover, the bending of the connection body 11 in the connection part C1 is further reduced by taking the length of the fastening part 31 which clamps the connection body 11 long.
Moreover, by forming each coupling body 11 and 21 with a tube, the weight of the coupling body can be reduced, and bending when the coupling body is coupled can be suppressed.
In this embodiment, although the form which embeds the fastening part 31 in the outer peripheral surface of the coupling bodies 11 and 21 was demonstrated, even if it is a form which is not embedded in an outer peripheral surface, an equivalent effect can be acquired.
The joint 10A of the connection body can also be applied to connection of existing connection pipes. Therefore, it is excellent in versatility.
On the contrary, the function of the connecting body itself can be exhibited without problems even if the reverse structure is arranged in which a male type is provided on the driving side connecting body and a female type is provided on the digging side connecting body.

Another preferred embodiment (second embodiment) of the joint of the connector according to the present invention will be described below with reference to FIG.
As shown in FIG. 3, the joint 10 (10 </ b> B) of the coupling body couples the digging-side coupling body 13 and the driving-side coupling body 23 that transmits the rotational force and the feeding force to the digging-side coupling body 13. It is a joint to do. It is preferable that the digging-side coupling body 13 and the driving-side coupling body 23 are configured by the same coupling pipe as in the first embodiment.

As one connecting body, for example, a female mold 15 having a space (columnar space) 15SP opened in the driving-side end face 13A is arranged on the digging-side connecting body 13. In addition, a male cylinder ₁₄ having a polygonal column is arranged on the bottom surface 15B of the female mold 15 so that the center axes C ₁₅ and C ₁₄ thereof coincide with each other. The polygonal column is the same as in the first embodiment.

As one of the coupling bodies, the coupling body 23 on the driving side of the other coupling body is provided with a cylindrical male mold 25 on the digging-side end face 23A, and opens to the male end face 25A. A female die 24 having a space (polygonal column type space) 24SP in which is fitted is arranged. The male mold 25 and the female mold 24 are arranged such that their central axes C ₂₅ and C ₂₄ coincide with each other. However, a clearance (not shown) necessary for fitting the male mold 14 is provided between the female mold 24 and the male mold 14. The clearance is as described in the first embodiment.
Therefore, the cylindrical male die 25 is fitted into the female die 15 having a space (cylindrical space) 15SP arranged in the digging-side connecting body 13 where the cylindrical male die 25 is not arranged.
The length of the cylindrical male mold 25 needs to be such that no inclination occurs in the linking body 13 on the excavation side due to the clearance. For example, 10 cm to 20 cm is preferable from the connection position C1 to the digging side, 15 cm to 20 cm is more preferable, and 18 cm to 20 cm is more preferable.

  Between the female mold 15 and the male mold 25, a clearance (not shown) necessary for fitting the male mold 25 is provided. The clearance is the same as the clearance described in the first embodiment, but the average gap is, for example, the gap between the cylindrical male mold 25 and the female mold 15 having the cylindrical space 15SP with respect to the central axis of the cylinder. The average value is measured at intervals of 90 degrees in the circumferential direction. This clearance is smaller than the clearance between the male die 14 having a polygonal column and the female die 24 having a space (polygonal column type space) 24SP. The clearance is usually 0.2 mm to 1 mm, preferably 0.2 mm to 0.8 mm, and more preferably 0.2 mm to 0.4 mm.

Similarly to the first embodiment, the end surface 14A of the male mold 14 is pressed against the bottom surface 24B of the female mold 24 in a state in which the male mold 14 of the polygonal column is fitted into the female mold 24 having the space 24SP. It is preferable that the configuration be Further, it is preferable that the drive side end face 13A of the female die 15 having the cylindrical space 15SP and the connecting end face 23A on the digging side around the male die 25 of the cylinder are in contact with each other. With such a configuration, the feeding force is easily transmitted from the driving-side connecting body 23 to the digging-side connecting body 13.
Further, as in the first embodiment, it is preferable that chamfering (not shown) is made around the end surfaces 14A and 25A of each male mold so as to facilitate fitting.

  The male molds 14 and 25 have cavities (not shown) inside for the purpose of weight reduction within the range in which the shear strength is maintained while being fitted into the corresponding female molds 24 and 15. It is preferable. Moreover, it is preferable that the outermost peripheral part of the connecting body 13 on the digging side where the female mold 15 having the columnar space 15SP is disposed has a thickness that can maintain the shear strength.

  The joint 10B of the connecting body of the second embodiment is configured so that the male mold 14 of the polygonal column of the connecting body 13 on the excavation side fits into the female mold 24 having the space 24SP of the connecting body 23 on the driving side. The rotating power of the connecting body 23 can be easily transmitted to the connecting body 13 on the excavation side. The cylindrical male mold 25 of the drive-side coupling body 23 is fitted into the female mold 15 in the cylindrical space of the excavation-side coupling body 13. Therefore, even if a clearance is provided between the female mold 24 and the male mold 14, the connecting body on the digging side with the opening end 24 </ b> P of the female mold 24 as a fulcrum with respect to the connecting body 23 on the driving side. It is suppressed that 13 falls to a perpendicular direction. Therefore, the connecting body 13 on the excavation side and the connecting body 23 on the driving side are connected in a straight line. Further, when the coupling body on the driving side is sequentially coupled using the joint 10B, the entire coupled body is coupled in a straight line. Therefore, it is possible to substantially eliminate the clearance for fitting the male mold having a polygonal cross section, and it is possible to suppress the bending of the entire connecting body. For this reason, it becomes possible to dig with good straightness.

  Next, another preferred embodiment (third embodiment) of the joint of the connector according to the present invention will be described below with reference to FIG.

  As shown in FIG. 4, the coupling joint 10 (10 </ b> C) connects the digging-side coupling body 16 and the driving-side coupling body 26 that transmits the rotational force and the feeding force to the digging-side coupling body 16. It is a joint to do. The connecting body 16 on the excavation side and the connecting body 26 on the driving side are configured by the same connecting pipe as in the first embodiment.

As one of the coupling bodies, for example, the digging-side coupling body 16 is provided with a cylindrical male mold 18 on the driving side end face 16A, and further on the end face 18A of the cylindrical male mold 18 with a mutual central axis C _17. , C ₁₈ are made to coincide with each other, and the male column 17 of the polygonal column is arranged. The polygonal column is the same as in the first and second embodiments. Therefore, the connecting body 16 on the excavation side has a cylindrical male mold 18 and a polygonal male mold 17 in which the central axes C ₁₇ and C ₁₈ are aligned with the drive side end face 16A of the excavating side connecting body 16 in order. It is a stacked form.

As one of the coupling bodies, the coupling body 26 on the driving side of the other coupling body is provided with a female mold 28 in a cylindrical space having an opening in the digging-side end face 26A and into which the cylindrical male mold 18 is fitted. Yes. Further, the bottom surface 28B of the female die 28, to match each other's center axis _{C 27, C 28,} female 27 having the full the polygonal spatial 27SP mating male mold 17 of the polygonal prism is arranged . However, a clearance (not shown) necessary for fitting the male mold 17 is provided between the male mold 17 and the female mold 27. The clearance is as described in the first embodiment. Therefore, the central axes C ₂₇ and C ₂₈ are aligned on the digging-side end face 26A side of the drive-side connecting body 26, so that the female mold 28 in the cylindrical space and the female bottom 28B in the polygonal column space are aligned with the female bottom surface 28B. The mold 27 is formed in order.

  Between the female mold 27 and the male mold 17, a clearance (not shown) necessary for fitting the male mold 17 is provided. The clearance is the same as the clearance between the male mold 14 and the female mold 24 described in the second embodiment.

Similarly to the first embodiment, the end surface 17A of the male mold 17 is pressed against the bottom surface 27B of the female mold 27 in a state where the male mold 17 of the polygonal cylinder is fitted in the polygonal column space 27SP of the female mold 27. It is preferable to adopt a configuration to be applied. Further, it is preferable that the digging-side end face 26A of the female die 28 and the driving-side end face 16A around the male die 18 of the digging-side coupling body 16 are in contact with each other. With such a configuration, the feeding force is easily transmitted from the driving-side connecting body 26 to the digging-side connecting body 16.
Further, as in the first embodiment, it is preferable that chamfering (not shown) is made around the end faces 17A and 18A of each male mold in order to facilitate fitting.

  The male molds 17 and 18 have cavities (not shown) inside for the purpose of weight reduction within the range in which the shear strength is maintained while being fitted in the corresponding female molds 27 and 28. It is preferable. Moreover, it is preferable that the outermost peripheral part of the drive-side coupling body 26 in which the female mold 28 in the cylindrical space is disposed has a thickness that can maintain the shear strength.

  The joint 10C of the connecting body according to the third embodiment is configured so that the male die 17 of the polygonal column of the connecting member 16 on the excavation side fits into the female die 27 of the polygonal column type space of the connecting member 26 on the driving side. The rotational force of the connecting body 26 on the side can be easily transmitted to the connecting body 16 on the excavation side. Even if a clearance is provided between the female mold 27 and the male mold 17, the male mold 18 fits into the cylindrical space 28SP of the female mold 28. Using the opening end 27P of the female die 27 as a fulcrum, the digging-side connecting body 16 is prevented from being lowered in the vertical direction. Therefore, the connecting body 16 on the excavation side and the connecting body 26 on the driving side are connected in a straight line. Further, when the coupling body on the driving side is sequentially coupled using the joint 10C, the entire coupled body is coupled in a straight line. Therefore, it is possible to substantially eliminate the clearance for fitting the male mold having a polygonal cross section, and it is possible to suppress the bending of the entire connecting body. For this reason, it becomes possible to dig with good straightness.

  Next, with reference to FIG. 5, a description will be given of a digging apparatus that digs by adding a driving-side coupling body to a digging-side coupling body using the coupling body joint of the present invention. The drawing shows a state before the driving-side coupling body is added to the excavation-side coupling body.

  As shown in FIG. 5, the digging apparatus 100 includes a driving-side coupling body that transmits rotational force and feed force to the digging-side coupling body, to a digging-side coupling body having a head 141 for digging disposed at the tip. It is a digging device that digs up one after another.

  The excavation apparatus 100 includes a pedestal 111, on which a support base 112 capable of adjusting the elevation angle is disposed, and an auger drive unit 125 that reciprocates in the mining direction is disposed. The support table 112 is provided with an elevation angle adjustment unit 131 that adjusts the elevation angle of the support table 112.

The auger drive unit 125 is attached with a spiral auger 121 that is a digging-side connected body that is rotated by the auger drive unit 125. The spiral auger 121 includes an auger shaft 122 and a wing portion 123 arranged in a spiral around the auger shaft 122, and an auger head 141 is attached to the tip of the auger shaft 122. On the drive side of the spiral auger 121, another screw auger (not shown) can be added by the joint of the coupling body of the present invention (see FIG. 1 and the like).
The auger head 141 can be of various existing configurations, and preferably has a pilot bit 161 at the tip.

  On the pedestal 111, a support table 112 is swingably disposed. On the pedestal 111, an elevation angle adjustment unit 131 that adjusts and holds the elevation angle of the support table 112 to a desired angle is rotatably arranged with respect to the support unit 114. The elevation angle adjustment unit 131 adjusts the elevation angle by swinging the support base 112 up and down by driving a piston 133 that can reciprocate in the cylinder 132. The elevation angle of the spiral auger 121 is adjusted by adjusting the direction of the support base 112 by the elevation angle adjustment unit 131.

  Further, an auger drive unit 125 that reciprocates in the mining direction is disposed on the support table 112. The auger drive unit 125 is fixed on a forward / reverse drive unit 126 that moves back and forth (reciprocating) in the digging direction on the track 117 arranged on the support base 112. The track 117 is made of a rail, for example, and the forward / reverse drive unit 126 has, for example, a rotating wheel (not shown) that moves on the track 117, and a rotating wheel drive unit (not shown) that rotates the rotating wheel. It is what you have.

  A spiral auger 121 is supported on the auger drive unit 125 via a chuck mechanism 127. Specifically, it is preferable that a chuck mechanism 127 that allows the spiral auger 121 to be attached and detached is fixed to the drive shaft 128 of the auger drive unit 125. A spiral auger 121 is attached to and supported by the chuck mechanism 127. Therefore, the spiral auger 121 is rotatably supported by the auger drive unit 125 on the support base 112 on the pedestal 111 via the chuck mechanism 127. The chuck mechanism 127 may be detachably attached as long as the chuck mechanism 127 can be fixed to the drive shaft 128 of the auger drive unit 125 so as not to come off during rotation. In addition, it is preferable that an auger support portion 129 that rotatably supports the spiral auger 121 is provided on the distal end side of the spiral auger 121 on the support base 12.

  The auger drive unit 125 is basically configured by an electric motor or an oil motor and a gear box, for example, but other rotation drive devices can also be used.

  The spiral auger 121 includes an auger head 141 at the tip of the auger shaft 122 in the mining direction. The auger head 141 may be detachably attached to the auger shaft 122 via an attachment portion (not shown), or may be fixed by welding or the like. There is no restriction | limiting in particular in an attachment part, For example, you may attach in a screwing type.

A pilot bit 161 is preferably attached to the tip of the auger head 141. The pilot bit 161 guides the auger head 141 in the excavation direction, which is the direction in which the auger shaft 122 is extended, in order to assist mining by the auger head 141. For example, a plurality of auger tips are bonded to a pilot shaft.
The pilot bit 161 is fixed to the tip of the auger head 141, for example. As a means for fixing, any means may be used, and an example is welding.

  The pedestal 111 is installed on a moving device 181 that moves in the plane direction. An example of the moving device 181 is a crawler, that is, an endless track vehicle. An endless track vehicle can travel even on a so-called bad road such as a mine or a mining site.

  Moreover, it is preferable that the moving device 181 includes a stopper (not shown) that receives a reaction force received by the auger head 141 during mining. This stopper is provided on the side opposite to the mining side of the moving device 181. As the stopper, for example, a bulldozer discharge plate can be used.

  The excavation apparatus 100 may be provided with a driving device 110 that can be operated by an operator on the pedestal 111. For example, the operation device 110 gives commands such as operation of the moving device 181, operation of the auger drive unit 125 and forward / reverse drive unit 126, adjustment of the elevation angle adjustment unit 131, supply of compressed gas, operation of a stopper, and the like. . Instead of being arranged on the pedestal 111, the driving device may be based on wireless operation or wired operation by an operator. That is, the operating device may be provided separately from the excavation device 100.

Although not shown, the excavation device 100 includes a power supply device that operates the excavation device 100 and a power source that operates the excavation device and the power supply device. The power supply device and the power source are preferably arranged separately from the excavation device 100 in order to reduce the size of the excavation device 100.
Examples of the power supply device include an electric motor, an oil pump, and an oil tank. In addition to the hydraulic pressure supply device, the power supply device may be provided with a compressed gas supply device that supplies compressed gas. Examples of the compressed gas supply device include an electric motor and a compressor.
The power source is composed of a power generation device, for example. The electric power obtained from the power source is supplied to the power supply device by electric wiring. Although not shown, a part of the electric power obtained from the power source may be supplied to the auger driving unit 125 of the driving device. Transmission from the power supply device to the excavation device 100 is performed by hydraulic piping, compressed gas piping, or the like. Moreover, these power supply devices and power sources may be controlled by the operating device.

The mining method of the present invention will be described below. This mining method is performed using the excavation apparatus 100 as an example.
As shown in FIG. 5, the spiral auger 121 is attached to the drive shaft 128 of the auger drive unit 125 via the chuck mechanism 127 before the excavation apparatus 100 is operated. An auger head 141 is disposed at the tip of the spiral auger 121. In addition, an auger tip (not shown) is disposed on the auger head 141. The auger chip is selected according to the shape of the mining object to be obtained by mining.

Then, the auger head 141 disposed at the tip of the spiral auger 121 is moved to the mining position, and the spiral auger 121 is rotated and advanced together with the auger head 141 to dig up.
Specifically, the excavation apparatus 100 is moved, and the elevation angle adjustment unit 131 adjusts the elevation angle of the support base 112 in the direction in which the mineral vein exists, and aligns the auger head 141 at the position of the mineral vein to be mined. As a result, the auger head 141 is adjusted to the mining position, and the advancing direction of the auger head 141 is determined. In this state, the auger drive unit 125 is rotationally driven, the forward / reverse drive unit 126 is advanced along the track 117 of the support 112, and the mining of the vein is started by the rotating auger head 141.

  Specifically, when mining is started, the spiral auger 121 is advanced by the forward / reverse drive unit 126, and the auger head 141 is rotated together with the spiral auger 121 by the auger drive unit 125. Then, the blade part of the auger chip cuts into the mine, and the mining surface including the mine is scraped off.

  Subsequently, a step of sequentially moving the mined material obtained by mining along the head shaft 142 of the auger head 141 toward the spiral auger 121 and transporting the moved mined material backward by the rotation of the spiral auger 121 is performed. .

  Then, when the spiral auger 121 is advanced by the forward / reverse drive unit 126 and the chuck mechanism 127 reaches near the mining surface, the drive of the forward / reverse drive unit 126 is once stopped and the rotation of the auger drive unit 125 is stopped. Next, the spiral auger 121 is removed from the chuck mechanism 127, and the forward / reverse drive unit 126 is moved backward to return to the original position. Then, a new spiral auger (not shown) is connected to the chuck mechanism 127 and the spiral auger 121 in a state of being pierced into the excavation hole. The spiral augers are connected to each other by using the joint of the above-described connection body of the present invention (see FIG. 1 and the like). Therefore, the spiral auger 121 and the new spiral auger have the coupling joint of the present invention.

With the new spiral auger added, the auger drive unit 125 is driven to rotate again in the same manner as described above, and the forward / reverse drive unit 126 is advanced again along the track 117 of the support base 112. The mining of the vein is resumed with the auger head 141.
Then, by repeating the mining of the vein with the auger head 141 and the addition of the spiral auger 121, the mining proceeds with good straightness.

  According to the excavation apparatus and the excavation method, since the spiral augers are connected by the joint 10 of the connection body of the present invention, the entire spiral auger including the spiral auger 121 and the added spiral auger is not bent. Therefore, the rotational force and the feeding force of the spiral auger (not shown) which is the drive side connecting body 21 (see FIG. 1) are transmitted to the spiral auger 121 which is the digging side connecting body 11 (see FIG. 1). It becomes possible to dig straight.

10, 10A, 10B, 10C Connected joint (joint)
11, 13, 16 Linked body (connector) on the excavation side
11A, 13A, 16A Drive end face 11S, 21S Outer peripheral face 12, 14, 17, 18, 25 Male mold 12A, 14A, 17A, 18A, 25A Male mold end face 12S Side face 15, 22, 24, 27, 28 Female mold 15B, 22B, 24B, 27B, 28B Female bottom 15SP, 28SP space (cylindrical space)
21, 23, 26 Drive side connection body (connection body)
21A, 23A, 26A Engraving side end face 22S Side face 22P, 24P, 27P Female type open end 22SP, 24SP, 27SP Space (polygonal column type space)
31 fastening portion 31A first fastening portion 31B second fastening portion 32A first fastening portion 32B second fastening portion 33A, 33B, 34A, 34B collar portion 35S, 36S clearance between collar portions 35A, 35B, 36A, 36B holes 37A, 37B Bolt 38A, 38B Nut 39A, 39B Washer 100 Engraving device 110 Driving device 111 Pedestal 112 Support base 113 Swing shaft 114 Support portion 117 Track 121 Spiral auger 122 Auger shaft 123 Feather portion 125 Auger drive portion 126 Forward / backward drive portion 127 Chuck mechanism 128 drive shaft 129 auger support portion 131 elevation depression angle adjusting section 132 cylinder 133 piston 141 auger head 161 pilot bits C1 connecting position _{C 11, C 12, C 14} , C 15, C 17, C 18, C 24, C ₂₅ , C ₂₇ , C ₂₈ central axis D ₂₁ drive-side thickness D1-D6 gap

Claims (6)

Of the coupling body on the digging side and the driving side coupling body that transmits the rotational force and the feeding force to the digging side coupling body, the male model of the polygonal column arranged on one coupling body, and the other coupling body A female mold having a space in which the male mold of the polygonal column arranged in
In the state in which the male mold is fitted to the female mold, the position of the both connecting bodies connected to each other on the outer peripheral surface and the connection position are in close contact with the outer peripheral surface on the digging side and the driving side. A coupling joint with a fastening part that tightens the body. Of the coupling body on the digging side and the driving side coupling body that transmits the rotational force and the feeding force to the digging side coupling body, the male model of the polygonal column arranged on one coupling body, and the other coupling body A female mold having a polygonal column type space into which the male mold of the polygonal column arranged in
A male column having a cylindrical shape disposed in either one of the coupling bodies, and a female mold having a cylindrical space in which the male mold of the column is fitted, disposed in a coupling body on which the male mold of the column is not disposed. A coupling joint comprising:   3. The coupling body according to claim 2, wherein the male mold of the polygonal column is disposed on a bottom surface of the female mold having the cylindrical space, and the female mold having the polygonal column space is disposed on the male mold of the column. Fittings.   The male mold of the polygonal column is disposed on the front end surface of the male mold of the cylinder, and the female mold having the polygonal column space is disposed on the bottom surface of the female mold having the columnar space. Connected joint. A digging apparatus for digging by sequentially adding a driving-side coupling body that transmits rotational power and a feeding force to the digging-side coupling body to a digging-side coupling body having an excavation head disposed at the tip,
The excavation apparatus which has the joint of the connection body of any one of Claims 1-4 in the connection body of the said excavation side, and the connection body of the said drive side.   5. A drive-side coupling body that sequentially transmits the turning force and the feeding force to the digging-side coupling body is sequentially added to the digging-side coupling body by the coupling body coupling according to any one of claims 1 to 4. The method of digging.

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