JP7341076B2 - Deep well drilling method and double pipe holder - Google Patents

Description

The present invention relates to a deep well drilling method for drilling a deep well using a rotary percussion double pipe boring device, and a method for drilling a deep well using a rotary percussion double pipe boring device, and a method for drilling a drilled double pipe rod and the next double pipe rod in the rotary percussion double pipe boring device. The present invention relates to a double pipe holder for holding the next double pipe rod when lifting and supplying the next double pipe rod to a connection position with the double pipe rod.

Conventionally, rotary percussion double-pipe boring equipment has advantages such as high excavation speed and ability to cope with various excavation directions, and is often used for excavation for installing anchors on slopes. This device drills holes using a double-tube rod consisting of an outer tube and an inner tube inserted into the outer tube. To dig a deep well, it is necessary to drill a hole deep underground, but since the length of a single double-pipe rod is limited, a double-pipe rod for extending the rod is attached to the already-drilled double-pipe rod. By connecting heavy pipe rods in sequence while excavating, it is possible to excavate deep underground. When connecting the next double-pipe rod to the double-pipe rod that has already been drilled, it is common for a worker to insert the inner pipe into the outer pipe and manually feed it to the connection position. be. However, the connection work is laborious and takes a lot of time. For example, the inner tube inserted into the outer tube may slip out of the outer tube and fall, resulting in injury to the operator, which is dangerous.

Therefore, in order to reduce the labor of the worker and eliminate the danger to the worker when connecting the double pipe rod, the inner pipe is moved to a predetermined position inside the outer pipe as disclosed in Patent Document 1, for example. Attach a stopper with an inner tube receiving part to the outer periphery of the outer tube of the next double tube rod, grip the outer periphery of the outer tube with a gripping device, and lift the gripping device to the connection position. A method of transport has been proposed.

Japanese Patent Application Publication No. 05-163884

However, in recent years, the weight of the outer and inner tubes has tended to increase due to the increase in the size of double-pipe rods, and when drilling deep wells using rotary percussion double-pipe boring equipment, it is difficult to use double-pipe rods. Holes must be drilled vertically.

However, when drilling a hole with the double tube rod facing vertically, if the aforementioned stopper is attached to the tip of the outer tube and the double tube rod is fed to the connection position, it is possible to When the lower end of the inner tube of the next double tube rod is placed on the upper end of the double tube rod, the stopper will be sandwiched between the inner tube of the double tube rod with holes drilled and the inner tube of the next double tube rod. Since the load of the inner tube of the next double-pipe rod is directly applied to the stopper, the frictional force between the upper and lower inner tubes that sandwich the stopper and the stopper increases. Therefore, it becomes difficult to remove the stopper from the outer tube, and a lot of time and effort are spent on removing the stopper. In addition, the gripping device used to lift the double-pipe rod consists of a pair of arms connected at a predetermined distance, which are rotatably linked by a crank at the upper end of the arms, and are attached to the outside of the double-pipe rod like scissors. It grips the outer circumferential surface of the pipe, and in order to prevent the double pipe rod from falling, the weight of the double pipe rod applies force to the arm in the direction of closing it, so it cannot be lifted. It is difficult to maintain the vertical posture of a double pipe rod. Therefore, even if the above-mentioned stopper is attached to the tip of the outer tube and the double-tube rod is fed to the connection position using the above-mentioned gripping device, it is not sufficient from the viewpoint of workability and working time. I couldn't say it.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to enable the connection work to be performed safely and easily in a short time even when drilling a hole with a double pipe rod oriented in the vertical direction.

Means for solving the problem and effects of the invention

According to the first aspect of the present invention, there is provided a deep well drilling method for drilling a deep well using a rotary percussion double pipe boring device, the method comprising: drilling a deep well using a rotary percussion double pipe boring device; In order to connect the next double pipe rod, a pair of half annular bodies that can be opened and closed have one ends pivoted to each other, and a pair of half annular bodies provided at the opening and closing end sides of the pair of half annular bodies. an outer tube gripping ring and an inner tube gripping ring, each of which is provided with a tightening mechanism that tightens the annular body in the direction of closing the annular body; and a flexible connecting member that connects the outer tube gripping ring and the inner tube gripping ring. a preliminary step of preparing in advance a double tube holder for holding the next double tube rod, and mounting the outer tube of the next double tube rod on the outer tube gripping ring; After attaching the inner tube of the double tube rod inserted into the outer tube to the inner tube gripping ring with the lower end of the inner tube protruding from the lower end of the outer tube, lifting the outer tube gripping ring, a double pipe rod supplying step of supplying the next double pipe rod so that the lower end of the inner pipe of the next double pipe rod rests on the upper end of the inner pipe of the double pipe rod with holes drilled; After removing the inner tube gripping ring from the inner tube of the next supplied double tube rod and lowering the outer tube gripping ring, a drill head for driving the next double tube rod and the inner tube are connected to each other. and an inner tube connecting step of respectively connecting the inner tube of the next double tube rod and the inner tube of the double tube rod with holes already drilled, and the outer tube of the next double tube rod supplied as described above. an outer tube connecting step of connecting the outer tube to the drill head, removing the outer tube gripping ring from the connected outer tube, and connecting the outer tube connected to the drill head and the outer tube of the drilled double tube rod; and an inner tube removal step of sequentially extracting the drilled inner tubes from the double tube rod that has been drilled to a predetermined depth, leaving the outer tube behind, and after the removal of all the inner tubes is completed, A storage tube insertion step of sequentially connecting and inserting storage tubes having slits into the outer tube underground to a predetermined depth; and after inserting the storage tube to a predetermined depth, inserting the outer tube. a burying step of successively burying the tubes between the hole storage tube and the hole wall by sequentially removing the tubes and inserting embedding material through between the outer tube and the hole storage tube into the portion where the outer tube has been extracted; Can be configured to include

With the above configuration, even when drilling a hole with the double pipe rod oriented in the vertical direction, the connection work can be performed safely and easily in a short time.

According to the method for excavating a deep well according to the second aspect of the present invention, a pump having a maximum external dimension of less than 100 mm and having a pumping capacity that can serve as a countermeasure against landslides in soft ground derived from underground water pools is inserted into the hole storage pipe. It can be constructed so that the inner diameter is in the range of 140 mmφ to 160 mmφ.

With the above configuration, it is possible to provide a construction method with higher safety and operability in landslide countermeasures on soft ground.

According to the method for excavating a deep well according to the third aspect of the present invention, in the inner tube removal step, the inner tube gripping ring of the double tube holder is attached to and detached from the inner tube that has already been drilled. In order to improve operability, it can be separated from the outer tube gripping ring and used alone.

With the above configuration, the double pipe holder can also be used in the process of removing the inner tube, which is economical because no new equipment is required, and efficiency is improved because the work site is not complicated by increasing the number of equipment. It is also excellent in sex.

According to the deep well drilling method according to the fourth aspect of the present invention, in the hole storage pipe insertion step, the inner pipe gripping ring of the double pipe holder has the same or approximately the same outer diameter as the inner pipe. In order to hold the hole storage tube when lifting the hole storage tube and inserting it into a drilled outer tube, the hole storage tube can be separated from the outer tube gripping ring and used alone.

With the above configuration, the double pipe holder can also be used in the hole storage pipe insertion process, which is economical as no new equipment is required, and it is possible to avoid complicating the work site due to an increase in equipment. It also has excellent efficiency.

According to the method for excavating a deep well according to the fifth aspect of the present invention, the tightening mechanism is provided on the outer periphery of one of the pair of half annular bodies near the opening and closing end of the other half annular body. a threaded rod whose base is pivoted so as to be able to fall down toward the outer periphery near the open/close end of the half-annular body; a nut screwed near the tip of the threaded rod; and the other half-annular body. and a protruding piece provided on the outer periphery near the opening/closing end of the screw rod and having a groove for receiving the threaded rod.

With the above configuration, the outer tube gripping ring and the inner tube gripping ring can reliably grip the outer tube and the inner tube by folding the threaded rod and inserting it into the groove of the protruding piece, and then tightening the nut. Therefore, there is no need to form irregularities on the outer peripheral surfaces of the outer tube and the inner tube to prevent them from falling off. In addition, since the outer tube and inner tube can be attached and detached from the outer tube grip ring and inner tube grip ring without removing the components that make up the ring, attachment and detachment work becomes easier and the attachment and detachment time can be further shortened. can.

According to the method for excavating a deep well according to the sixth aspect of the present invention, when the inner tube gripping ring is attached to and detached from the inner tube, and when the outer tube gripping ring is attached to and detached from the outer tube, the nut is It can be configured to be rotated with an impact wrench.

With the above configuration, the labor of the worker can be reduced, and the inner tube gripping ring can be reliably attached to and removed from the inner tube, and the outer tube gripping ring can be attached to and removed from the outer tube in a shorter time. becomes possible.

According to the double pipe holder according to the seventh aspect of the present invention, the second double pipe rod is moved to the connecting position between the double pipe rod with holes drilled and the next double pipe rod in the rotary percussion double pipe boring device. A double pipe holder for holding the next double pipe rod when lifting and supplying the double pipe rod, the outer pipe holding ring being attached to the outer peripheral surface of the outer pipe of the double pipe rod; an inner tube grip ring attached to the outer peripheral surface of the inner tube of the double tube rod, connected to the outer tube grip ring by a flexible connecting member, and the inner tube grip ring and the outer tube tightening ring are , a pair of half annular bodies that are pivotably connected to each other at one end and can be opened and closed, and a tightening mechanism that tightens the pair of half annular bodies in a closing direction, provided on the opening/closing end side of the pair of half annular bodies. and can be provided with.

With the above configuration, it is possible to obtain a double-pipe holder that allows the connection work to be performed safely and easily in a short time even when drilling a hole with the double-pipe rod oriented in the vertical direction.

According to the double tube holder according to the eighth aspect of the present invention, the tightening mechanism is arranged near the opening/closing end of one of the pair of half annular bodies, and the other half of the annular body. A threaded rod whose base is pivoted so as to be able to fall down toward the outer periphery near the opening/closing end of the split annular body, a nut screwed near the tip of the threaded rod, and the other half of the split annular body. and a protruding piece provided on the outer periphery near the opening/closing end and having a groove for receiving the threaded rod.

With the above configuration, the outer tube gripping ring and the inner tube gripping ring can reliably grip the outer tube and the inner tube by folding the threaded rod and inserting it into the groove of the protruding piece, and then tightening the nut. Therefore, there is no need to form irregularities on the outer peripheral surfaces of the outer tube and the inner tube to prevent them from falling off. In addition, since the outer tube and inner tube can be attached and detached from the outer tube grip ring and inner tube grip ring without removing the components that make up the ring, attachment and detachment work becomes easier and the attachment and detachment time can be further shortened. can. Therefore, there is no need to form irregularities on the outer peripheral surfaces of the outer tube and the inner tube to prevent them from falling off. Further, it is convenient because the outer tube and the inner tube can be attached and detached from the outer tube gripping ring and the inner tube gripping ring without removing some of the parts that constitute them.

FIG. 1 is a side view of an apparatus used to carry out the method for excavating a deep well according to the present invention. It is a front view of a double pipe holder. FIG. 3 is a plan view of the inner tube gripping ring. FIG. 3 is a left side view of the inner tube grip ring. FIG. 3 is a plan view of the inner tube gripping ring showing a pair of half-circular bodies in an open state. FIG. 3 is a plan view of the outer tube grip ring. 1 is a flowchart showing an example of a method for excavating a deep well according to the present invention. It is a flowchart which shows an example of the excavation process in the excavation method of a deep well. It is a flowchart which shows an example of the connection method of a double pipe rod. It is an explanatory view showing a state where the outer tube with holes drilled is gripped in the outer tube cutting process. It is an explanatory view showing a state where a drill head is cut away from an outer pipe which has already been drilled. It is an explanatory view showing a state where an inner tube with a hole already drilled is gripped in an inner tube separation step. It is an explanatory view showing the state where the double tube rod for extension is carried into the connection position. It is an explanatory view showing a state where an inner pipe grasping ring is removed from an inner pipe. It is an explanatory view showing a state where an outer pipe was lowered in an inner pipe connection process. It is an explanatory view showing a state where connection of an inner pipe is completed in an inner pipe connection process. It is an explanatory view showing a state where the upper end of the outer tube is connected to a drill head. FIG. 3 is an explanatory diagram showing a state in which the outer tube grip ring is removed from the outer tube. It is an explanatory view showing a state where an outer tube is connected to an excavated outer tube.

Embodiments of the present invention will be described below based on the drawings. However, the embodiments shown below exemplify a deep well drilling method and a double pipe holder for embodying the technical idea of the present invention, and the present invention includes the following embodiments. Not specified. Moreover, this specification does not in any way specify the members shown in the claims to the members of the embodiments. In particular, the dimensions, materials, shapes, relative positions, etc. of the components described in the embodiments are not intended to limit the scope of the present invention, unless otherwise specified, and are merely illustrative. Just an example. Note that the sizes, positional relationships, etc. of members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same names and symbols indicate the same or homogeneous members, and detailed descriptions will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured so that a plurality of elements are made of the same member so that one member serves as a plurality of elements, or conversely, the function of one member may be performed by a plurality of members. It can also be accomplished by sharing.
(Equipment used to carry out deep well drilling method)

As shown in FIG. 1, a rotary percussion double pipe boring device 1 used for carrying out the deep well drilling method of the present invention includes a drill head 3 that drives a double pipe rod 2, The feeding device 5 is provided with a feeding device 5 that moves forward and backward along a guide cell 4 directed in the direction. The guide cell 4 can change its attitude in various ways by an excavation attitude changing mechanism 7 provided in a main body 6 of the apparatus having a crawler 6a, and in FIG. 1 it is in an attitude that allows excavation in the vertical direction. The drill head 3 can vibrate in the drilling direction while rotating the double tube rod 2 having a drilling bit at its tip. The double pipe rod 2 is connected to the drill head 3, and while the drill head 3 is driving the double pipe rod 2, the drill head 3 is advanced by the feeding device 5, so that the double pipe rod 2 digs into the ground. be able to. By sequentially connecting new double pipe rods 2 to the already drilled double pipe rod 2 and performing excavation while extending it, it is possible to excavate deep underground. When connecting the double-pipe rod 2, the double-pipe rod 2 is attached to the double-pipe holder 8, and the double-pipe holder 8 is lifted up by the lifting device 9, and the drill head 3 is lifted up while it is being evacuated. It is carried to the lower connection position and finally arranged manually by an operator as shown by the two-dot chain line in FIG.
(Double pipe holder 8)

FIG. 2 shows a state in which the double-pipe rod 2 is attached to the double-pipe holder 8 in order to lift the double-pipe rod 2 and supply it to the connection position. The double tube rod 2 consists of an outer tube 10 and an inner tube 11 inserted into the outer tube 10, and each of the outer tube 10 and the inner tube 11 has male threads 10a and 11a formed on the outer periphery of one end thereof. Female threads 10b and 11b are formed on the inner circumference of the opposite end. The outer tubes 10 and the inner tubes 11 can be connected to each other by screwing together the male threads 10a, 11a and the female threads 10b, 11b. The double tube holder 8 includes an outer tube grip ring 12, an inner tube grip ring 13, and a flexible connecting member 14 that connects the outer tube grip ring 12 and the inner tube grip ring 13. In this embodiment, a wire rope made of twisted steel wires is used as the connecting member 14, but ropes, bands, strings, etc. made of other materials may be used instead.
(Inner tube grip ring 13)

As shown in FIGS. 3 and 4, the inner tube gripping ring 13 includes a pair of half annular bodies 15 and 16 for gripping the outer peripheral surface of the inner tube 11. As shown in FIGS. The pair of half annular bodies 15 and 16 each have a pivot portion 17 at one end, and have a hinge structure that can be rotated about a shaft body 18 to open and close. Furthermore, a tightening mechanism 19 is provided on the free end side, that is, on the opening/closing end side of the pair of half annular bodies 15 and 16, for tightening the pair of half annular bodies 15 and 16 in the closing direction.
(Tightening mechanism 19)

The tightening mechanism 19 includes a threaded rod 20 having a base 20a pivotally attached to the outer periphery of one half annular body 15 near the opening/closing end, a nut 21 screwed near the tip of the threaded rod 20, and the other half. It consists of a protruding piece 22 provided on the outer periphery of the annular body 16 near the opening and closing ends. A bracket 23 is fixed to the outer periphery of one of the half annular bodies 15 near the open/close end, and the base 20a of the threaded rod 20 is rotatably penetrated and held by a shaft 24 attached to the bracket 23. ing. Since the longitudinal central axis of the shaft body 24 is parallel to the tangential direction of the circumference of the half annular body 15, the threaded rod 20 swings around the shaft body 24 and connects the other half. It can collapse toward the outer periphery of the annular body 16 near the opening and closing ends. The protruding piece 22 has a groove 22a for receiving a portion of the fallen threaded rod 20 closer to the base 20a than the nut 21.

The inner tube gripping ring 13 shown in FIG. 3 is in a state of holding the inner tube 11, and the tightening mechanism 19 is in a state of tightening the pair of half annular bodies 15 and 16. To remove the inner tube 11 from the inner tube grip ring 13, loosen the nut 21 and lift the protruding piece 22 from one side 22b to a predetermined height, and then remove the threaded rod 20 from the protruding piece 22 around the shaft body 24. It is raised by rotating in the direction of separation, clockwise in FIG. 3, and then the pair of half annular bodies 15 and 16 are opened as shown in FIG. In addition, in order to attach the inner tube 11 to the inner tube grip ring 13, the pair of half annular bodies 15 and 16 are opened, and one of the pair of half annular bodies 15 and 16 is attached to the inner tube 11. The pair of half annular bodies 15 and 16 are closed by covering the outer peripheral surface of the ring. Then, the threaded rod 20 is pushed down toward the protruding piece 22, the nut 21 is hooked onto one side 22b of the protruding piece 22, and then the nut 21 is turned to tighten.
(Outer tube grip ring 12)

As shown in FIG. 6, the outer tube gripping ring 12 also includes a pair of half annular bodies 25 and 26 for grasping the outer circumferential surface of the outer tube 10. , each has a pivot portion 27 at one end, and has a hinge structure that can be rotated about a shaft body 28 to open and close. Further, a tightening mechanism 29 is provided on the opening/closing end side of the pair of half annular bodies 25 and 26 to tighten the pair of half annular bodies 25 and 26 in the closing direction. The tightening mechanism 29 has the same structure as the tightening mechanism 19 of the inner tube gripping ring 13, and includes a threaded rod 30 with a base 30a pivotally attached to the outer periphery of one of the half annular bodies 25 near the opening/closing end, and a threaded rod. 30, and a protruding piece 32 provided on the outer periphery near the opening and closing end of the other half annular body 26, and the protruding piece 32 has a groove 32a and one side 32b. There is.

In order to reduce the time and labor required to attach and detach the inner tube 11 and outer tube 10 to and from the inner tube grip ring 13 and outer tube grip ring 12, the nuts 21 and 31 are made of the same size, respectively. It is preferable to rotate it with an impact wrench. An impact wrench uses electricity or compressed air as a power source to rotate a socket attached to its output shaft while applying a rotational impact to the socket. Particularly good is one equipped with a battery as a power source.

As shown in FIG. 2, connecting fittings 33 are attached to both ends of the wire rope 14, which is a connecting member, a hanging piece 34 is attached to the outer tube gripping ring 12, and a hanging piece 35 is attached to the inner tube gripping ring 13. is permanently installed. In this embodiment, the hanging piece 35 is provided on one half of the annular body 25. Further, the lifting device 9 is a known crane truck. The connecting fitting 33 is an SC shackle, and can be easily attached to and detached from the hanging pieces 34 and 35, each of which has a connecting hole. Further, the width of one half annular body 25 of the outer tube gripping ring 12 is larger than the width of the other half annular body 26, and one half annular body 25 is provided with a sling belt for lifting, etc. A hanging piece 36 for hanging the hanging member 9a, and a handle 37 for improving operability such as positioning of the suspended double pipe rod 2 are provided.

The inner tube gripping ring 13 can be used separately from the outer tube gripping ring 12, and as shown in FIG. Two hanging pieces 35 are separately fixed to the half annular body 15 and the half annular body 16 in order to suspend the body.
(Rotary percussion double tube boring device 1)

The rotary percussion double tube boring device 1 grips an outer tube 10 disposed near the lower end of a guide cell 4, as shown in FIG. 1, in order to further reduce the labor required for connecting double tube rods. It is provided with an outer tube clamp 38 that can hold a hole, and an inner tube clamp 39 that is disposed above the outer tube clamp 38 and that can grip the inner tube 11 with a hole drilled therein. Furthermore, a separation clamp 40 is provided for loosening the threaded connection between the inner tubes 11 when recovering the inner tubes 11 that have been drilled. This separation clamp 40 is capable of gripping the inner tube 6 and rotating it by a predetermined angle. The drill head 3 is also provided with a drive rod 41 consisting of an outer tube drive rod 41a that transmits the driving force to the outer tube 10 of the double tube rod 2, and an inner tube drive rod 41b that transmits the driving force to the inner tube 11. Yes, the outer tube drive rod 41a and the inner tube drive rod 41b are driven as one. A male thread is formed on the outer periphery of the tip of the outer tube drive rod 41a to be screwed into the female thread 10b on the inner periphery of the end of the outer tube 10, and a male thread is formed on the inner periphery of the tip of the inner tube drive rod 41b. A female thread is formed to be screwed into the male thread 11a on the outer periphery of the end. The outer tube 10 and the inner tube 11 can be connected to and disconnected from the outer tube drive rod 41a and the inner tube drive rod 41b by rotating the drive rod 41 forward and backward in the tightening direction.
(Deep well drilling method)

Next, an example of the method for drilling a deep well according to the present invention will be described. As shown in FIG. Drilling process S1 of drilling a hole to a predetermined depth while sequentially connecting the double pipe rod 2 for extension to the pipe rod, and drilling a hole from the double pipe rod 2 that has been drilled to a predetermined depth, leaving the outer pipe 10. An inner pipe removal step S2 in which the completed inner pipes 11 are sequentially removed, and after all the inner pipes 11 have been removed, storage pipes having slits are sequentially connected in the outer pipe 10 underground to a predetermined depth. After the storage tube is inserted to a predetermined depth, the outer tube 10 is sequentially removed, and the outer tube 10 and the storage tube are inserted into the part where the outer tube 10 has been removed. This consists of a burying step S4 in which the burying material is sequentially buried between the hole storage tube and the hole wall by introducing the burying material through the space between the hole storage tube and the hole wall.

As shown in FIG. 8, the above-mentioned drilling process S1 includes a preliminary process S11 in which the double pipe holder 8 of the double pipe rod 2 is prepared in advance, and after performing the preliminary process S11, the drilling process S12 is performed. Implement. In the hole drilling process S12, a hole is drilled using the leading double pipe rod 2 with a drilling bit installed at the tip, and when the rear end of the double pipe rod 2 reaches near the ground surface, the drill head 3 drills the hole. Stop driving the heavy pipe rod 2. When the drilling process S12 is completed, if the leading double pipe rod 2 has not reached the predetermined depth, the process moves to the connection preparation process S13 and the connecting process S14, and the leading double pipe rod 2 reaches the predetermined depth. If the excavation step S1 has been reached, the excavation step S1 is ended.

In the connection preparation step S13, as shown in FIG. Regarding the double tube rod 2 connected to the double tube rod 2, attach the outer tube 10 to the outer tube grip ring 12, and insert the inner tube 11 inserted into the outer tube 10 so that the lower end of the inner tube 11 is connected to the outer tube. It is attached to the inner tube grip ring 13 in a state of protruding from the lower end of the tube 10. Then, a sling belt or the like is connected to the hanging piece 36 of the outer tube grip ring 12, and the outer tube grip ring 12 is hoisted up by the lifting device 9 and put on standby. When the outer tube grip ring 12 is lifted, the outer tube grip ring 12 and the inner tube grip ring 13 are connected by the connecting member 14, so the inner tube grip ring 13, the inner tube 11, and the outer tube 10 are also lifted up. It is lifted together with the tube grip ring 12.

FIG. 9 is a flowchart showing an example of a method for connecting the double-pipe rod 2, which is carried out in the double-pipe rod connection step S14 shown in FIG. This double pipe rod connection method includes an outer pipe separation step S141 in which the drill head 3 is separated from the outer pipe 10 in which a hole has been drilled, and a step S141 in which the drill head 3 is separated from the inner pipe 11 in which a hole has been drilled. The double pipe rod 2 prepared in the inner pipe separation step S142 of retracting to the standby position as shown in FIG. 1 and the connection preparation step S13 shown in FIG. an inner tube gripping ring removal step S144 in which the inner tube gripping ring 13 of the double tube holder 8 is removed from the inner tube 11 carried into the connection position, and a drill head 3 is moved to the connection position. An inner tube connecting step S145 connects the inner tube 11 that has been brought in and also connects the inner tube 11 connected to the drill head 3 to the drilled inner tube 11, and the outer tube attached to the outer tube grip ring 12. An outer tube upper end connection step S146 in which the tube 10 is raised and connected to the drill head 3, an outer tube grip ring removal step S147 in which the outer tube grip ring 12 is removed from the outer tube 10 carried into the connection position, and the drill head 3 is removed. After connecting the outer tube 10 carried into the connection position, the outer tube lower end connecting step S148 connects the outer tube 10 connected to the drill head 3 and the outer tube 10 in which the hole has been drilled.

In the outer tube cutting process, in S141, as shown in FIG. 10, after gripping the outer tube 10A with the drilled hole with the outer tube clamp 38, the drive rod 41 is reversed and the drill head 3 is retreated, so that the drilled hole is removed. The outer tube drive rod 41a is separated from the outer tube 10A. Thereby, the drill head 3 can be separated from the outer tube 10A in which the hole has been drilled.

In the inner tube cutting step S142, the drill head 3 is moved backward even after the outer tube drive rod 41a is cut off from the outer tube 10A, which has already been drilled, so that the upper end of the inner tube 11A, which has already been drilled, is removed from the inner tube as shown in FIG. Once raised to a position corresponding to the pipe clamp 39, the retraction of the drill head 3 is stopped. As shown in FIG. 12, after gripping the drilled inner tube 11A with the inner tube clamp 39, the drill head 3 is moved backward while the drive rod 41 is reversed, so that the inner tube 11A is inwardly drilled. Separate the tube drive rod 41b. Thereby, the drill head 3 is separated from the inner tube 11A that has already been drilled. Thereafter, the drill head 3 is moved back to the standby position as shown by the two-dot chain line in FIG. 12 and stopped.

The double pipe rod 2 for rod extension prepared in the connection preparation step S13 shown in FIG. It is preferable to lift the gripping ring 12 using the lifting device 9, transport it to a position close to the connection position, and leave it on standby, as shown in FIG.

In the rod supply step S143, the outer tube grip ring 12 of the double tube holder 8 prepared in the connection preparation step S13 is lifted up by the lifting device 9, and the drill head 3, which is retracted to the standby position, is lifted up as shown in FIG. Carry it into the connection position below. Then, the carried-in double-tube rod 2 is positioned so that the lower end of the inner tube 11B of the carried-in double-tube rod 2 rests on the upper end of the inner tube 11A of the double-tube rod that has already been drilled. When the positioning work is completed, the process of supplying the double pipe rod 2 to the connection position is completed. The outer tube grip ring 12 is hung with good stability by the lifting device 9 at the connection position even after the supply of the double tube rod 2 is completed. Since the upper end portion of the inner tube 11 is inserted into the outer tube 10, there is no fear that the inner tube 11B placed on the upper end of the inner tube 11A, which has already been drilled, will fall down. Furthermore, since the connecting member 14 that connects the outer tube gripping ring 12 and the inner tube gripping ring 13 is flexible, the next inner tube 11B placed on the upper end of the inner tube 11A that has already been drilled is , it can slide with respect to the outer tube 10B attached to the outer tube grip ring 12. Therefore, when lowering the double pipe rod 2 carried into the connection position onto the upper end of the inner pipe 11A where a hole has been drilled, there is no problem even if there are variations in the amount of descent of the outer pipe grip ring 12 by the lifting device 9. .

In the inner tube gripping ring removal step S144, the nut 21 of the inner tube gripping ring 13 is loosened, the threaded rod 20 is tilted in a direction away from the other half annular body 16, and removed from the protruding piece 22, and the pair of half annular bodies are removed. 15 and 16 to remove the inner tube grip ring 13 from the inner tube 11B. This state is shown in FIG.

In the inner tube connecting step S145, first, the outer tube grip ring 12 is lowered by the lifting device 9 as shown in FIG. At this time, the outer tube 10B also descends together with the outer tube grip ring 12. When the outer tube 10B descends, the upper end of the inner tube 11B protrudes from the upper end of the outer tube 10B. Next, the drill head 3 is lowered to bring the tip of the inner tube drive rod 41b into contact with the upper end of the inner tube 11B. Thereafter, the drill head 3 is lowered while rotating the drive rod 41, and the inner tube drive rod 41b and the upper end of the inner tube 11B are connected, and the lower end of the inner tube 11B and the drilled inner tube 11A are connected. Connecting. FIG. 16 shows a state in which this connection is completed.

In the outer tube upper end connection step S146, first, the inner tube clamp 39 releases the inner tube 11A in which a hole has been drilled. Next, the outer tube grip ring 12 is lifted by the lifting device 9, the outer tube 10B attached thereto is raised, and the lower end of the outer tube drive rod 41a and the upper end of the outer tube 10B are brought into concentric contact with each other, Furthermore, by rotating the driving rod 41 in the tightening direction using the drill head 3 while lifting the outer tube 10B using the lifting device 9, the upper end of the outer tube 10B is connected to the outer tube driving rod 41a as shown in FIG. .

In the outer tube gripping ring removal step S147, the tightening mechanism 29 of the outer tube gripping ring 12 is operated in the same manner as when removing the inner tube gripping ring 13 in the inner tube gripping ring removal step S144, and the outer tube gripping ring 12 is removed. Remove. Then, the removed outer tube gripping ring 12 is evacuated from the connection position in a suspended state as shown in FIG. 18 by the lifting device 9. In this embodiment, in the inner tube grip ring removal step S144 and the outer tube grip ring removal step S147, the nut 21 of the tightening mechanism 19 and the nut 31 of the tightening mechanism 29 are rotated using an impact wrench.

In the outer tube lower end connection step S148, the drill head 3 is lowered to bring the lower end of the outer tube 10B into concentric contact with the upper end of the outer tube 10A, which has already been drilled, and the drive rod 41a is rotated in the tightening direction by the drill head. While doing so, the drill head 3 is further lowered. Thereby, as shown in FIG. 19, the lower end of the outer tube 10B is connected to the upper end of the outer tube 10A in which a hole has been drilled. Thereafter, the outer tube clamp 38 is released from holding the outer tube 10A in which the hole has been drilled. This makes it possible to resume drilling.

In addition, in the inner tube removal step S2 shown in FIG. It is separated from the ring 12 and used alone. That is, the inner tube gripping ring 13 is assembled by removing the connecting fitting 33 at the lower end of the connecting member 14 shown in FIG. 9b is attached to the hanging pieces 33, 33 shown in FIG. Also, in the hole storage tube insertion step S3 shown in FIG. In addition, it is used by being attached to the hole storage tube in the same way as when it is attached to the inner tube 11.

In this way, the double tube holder 8 can be utilized not only in the double tube rod connection step S14, but also in the inner tube removal step S2 and the hole storage tube insertion step S3. Therefore, it is economical because new equipment is not required, and it is also excellent in efficiency because it is possible to avoid complicating the work site due to an increase in the number of equipment.
(Example of implementation for landslide prevention)

As explained above, using the rotary percussion double pipe boring device 1, even when drilling a hole with the double pipe rod oriented in the vertical direction, the connection work can be performed safely and easily in a short time. It became so. In addition, in the past, there were no submersible pumps with a maximum external dimension of less than 100 mm that had a pumping capacity that could be used as a countermeasure against landslides on soft ground originating from underground water pools, but in recent years, submersible pumps that are compact yet have sufficient pumping capacity have been available. Capable submersible pumps are now being manufactured.

Therefore, the method for excavating a deep well according to an embodiment of the present invention can now be adopted as a countermeasure against landslides in soft ground originating from underground water pools. When the deep well drilling method according to the embodiment of the present invention is adopted as a landslide countermeasure, the diameter of the hole drilled by the rotary percussion double pipe boring device 1 is set to 200 mmφ, and the hole storage tube inserted after drilling is completed has an inner diameter of 200 mm. Carbon steel pipe SGP150 (JIS G 3452) for piping with a diameter of 155.2 mm is used. In addition, the submersible pump inserted into the hole storage pipe used is Sunlong (registered trademark, manufactured by Kawamoto Seisakusho Co., Ltd.) with a pump outer diameter of 97 mmφ.

When the rotary percussion double pipe boring device 1 is used for landslide prevention, the allowable range for the inner diameter of the hole storage pipe is 140 mmφ to 160 mmφ, and the maximum allowable external dimension of the submersible pump inserted into the hole storage pipe. The range is 80mm to 100mm. There are product specifications for both hole storage pipes and submersible pumps, and as long as they are both within acceptable ranges, they can be installed appropriately. Regarding submersible pumps, if the maximum external dimension is less than 80 mm, it does not have the pumping capacity that can be used as a countermeasure against landslides on soft ground derived from underground water pools, and if it exceeds 100 mm, there is a risk that it may not be able to be inserted smoothly into the storage pipe. It is from.

According to this embodiment, even in soft ground where large-scale equipment cannot be brought in, a relatively small-scale rotary percussion double pipe boring equipment 1 can be brought in, so landslide prevention can be carried out safely and easily in a short time. will be able to do this.

Although one embodiment of the present invention has been described above, the embodiment can be varied in various ways. The deep well drilling method of the present invention is not limited to that shown in FIG. 7, but may be used to drill holes for other purposes as long as it includes the drilling process shown in FIG. Further, the double pipe holder of the present invention can be applied even when the excavation direction is not vertical, such as when drilling a hole to install a rock anchor on a slope.

1...Rotary percussion double pipe boring device 2...Double pipe rod 3...Drill head 4...Guide cell 5...Feeding device 6...Device body; 6a...Crawler 7...Drilling attitude change mechanism 8...Double pipe holder 9 ...Lifting device 10...Outer tube; 10a...Male thread; 10b...Female thread 11...Inner tube; 11a...Male thread; 11b...Female thread 12...Outer tube gripping ring 13...Inner tube gripping ring 14...Connecting member 15...Half annular body 16 ...Half annular body 17...Pivot part 18...Shaft 19...Tightening mechanism 20...Threaded rod; 20a...Base 21...Nut 22...Protruding piece; 22a...Groove; 22b...Single side 23...Bracket 24...Shaft 25 ...Half annular body 26...Half annular body 27...Pivot part 28...Shaft body 29...Tightening mechanism 30...Threaded rod; 30a...Base 31...Nut 32...Protruding piece; 32a...Groove; 32b...Single side 33... Connection fitting piece 34...Hanging piece 35...Hanging piece 36...Hanging piece 37...Handle 38...Outer tube clamp 39...Inner tube clamp 40...Separation clamp 41...Drive rod; 41a...Outer tube drive rod; 41b...Inner tube Drive rod S1...Drilling process; S11...Preliminary process; S12...Drilling process; S13...Connection preparation process; S14...Connection process; S141...Outer tube separation process; S142...Inner tube separation process; S143...Rod carrying process; S144 ...Inner tube gripping ring removal step; S145...Inner tube connection step; S146...Outer tube upper end gripping ring removal step; S147...Outer tube gripping tube removal step; S148...Outer tube lower end connection step S2...Inner tube removal step S3...Storage Hole pipe insertion process S4...burying process

Claims (8)

A deep well drilling method for drilling a deep well using a rotary percussion double pipe boring device, the method comprising:
In order to connect the next double-tube rod to the double-tube rod that has already been drilled, a pair of half-annular bodies that can be opened and closed are connected at one end to each other, and a pair of half-annular bodies that can be opened and closed are attached to the opening and closing ends of the pair of half-annular bodies. connecting an outer tube gripping ring and an inner tube gripping ring each provided with a tightening mechanism for tightening the pair of half annular bodies in a closing direction; and connecting the outer tube gripping ring and the inner tube gripping ring. a preliminary step of preparing in advance a double-pipe holder for holding the next double-pipe rod, which is made of a flexible connecting member;
Attach the outer tube of the next double tube rod to the outer tube grip ring, and insert the inner tube of the double tube rod inserted into the outer tube until the lower end of the inner tube protrudes from the lower end of the outer tube. After attaching it to the inner tube gripping ring in the state of a double pipe rod supplying step of supplying the next double pipe rod so as to rest on the double pipe rod;
After removing the inner tube gripping ring from the inner tube of the next supplied double tube rod and lowering the outer tube gripping ring, a drill head for driving the next double tube rod and the inner tube are removed. and an inner tube connecting step of connecting the inner tube of the next double tube rod and the inner tube of the double tube rod with holes drilled, respectively;
Connect the outer tube of the next supplied double tube rod to the drill head, remove the outer tube grip ring from the connected outer tube, and connect the outer tube connected to the drill head with the drilled double tube rod. an outer tube connecting step of connecting the outer tube of the tube rod;
an inner tube removal step of sequentially extracting the drilled inner tube from the double tube rod that has been drilled to a predetermined depth, leaving the outer tube;
After the removal of all the inner pipes is completed, a hole storage pipe insertion step of inserting hole storage pipes having slits into the outer pipe underground while sequentially connecting them to a predetermined depth;
After the hole storage tube has been inserted to a predetermined depth, the outer tube is sequentially extruded, and a burial material is inserted through the space between the outer tube and the hole storage tube into the part where the outer tube has been extruded. , a burying process of sequentially burying between the hole storage pipe and the hole wall;
methods of drilling deep wells, including; The method for excavating a deep well according to claim 1,
The hole storage pipe has an inner diameter in the range of 140 mmφ to 160 mmφ, so that a pump with a maximum external dimension of less than 100 mm, which has a pumping capacity that can be used as a countermeasure against landslides on soft ground derived from underground water pools, can be inserted. How to drill a well. The method for excavating a deep well according to claim 1 or 2,
In the inner tube removal step, the inner tube gripping ring of the double tube holder is separated from the outer tube gripping ring to improve operability when attaching to and removing from the inner tube that has already been drilled. A method of drilling a deep well, which is characterized by the use of: The method for excavating a deep well according to any one of claims 1 to 3,
In the hole storage tube insertion step, the inner tube gripping ring of the double tube holder is used when lifting the hole storage tube having the same or substantially the same outer diameter as the inner tube and inserting it into the hole-drilled outer tube. A method for excavating a deep well, characterized in that the hole storage tube is separated from the outer tube gripping ring and used alone to hold the hole storage tube. The method for excavating a deep well according to any one of claims 1 to 4,
The tightening mechanism is
The base is pivoted so that it can fall onto the outer periphery of one of the pair of half annular bodies near the opening and closing end of the other half annular body, toward the outer periphery of the other half annular body near the opening and closing end. The attached threaded rod and
a nut screwed near the tip of the threaded rod;
A method for excavating a deep well, comprising: a protruding piece provided on the outer periphery of the other half annular body near the opening/closing end and having a groove for receiving the threaded rod. The method for excavating a deep well according to claim 5,
A method for excavating a deep well, wherein the nut is rotated with an impact wrench when attaching and detaching the inner tube gripping ring to the inner tube and when attaching and detaching the outer tube gripping ring to the outer tube. When lifting and feeding the next double pipe rod to the connection position between the drilled double pipe rod and the next double pipe rod in a rotary percussion double pipe boring machine, the next double pipe rod is A double pipe holder for holding,
an outer tube gripping ring attached to the outer peripheral surface of the outer tube of the double tube rod;
an inner tube gripping ring connected to the outer tube gripping ring by a flexible connecting member and attached to the outer peripheral surface of the inner tube of the double tube rod;
The inner tube gripping ring and the outer tube tightening ring each include a pair of half annular bodies that are pivotably connected to each other at one end and can be opened and closed; A double pipe holder characterized by comprising a tightening mechanism that tightens the half annular body in a closing direction. The double pipe holder according to claim 7, wherein the tightening mechanism comprises:
The base is pivoted near the opening and closing end of one of the pair of half annular bodies so that it can fall down toward the outer periphery near the opening and closing end of the other half annular body. a threaded rod,
a nut screwed near the tip of the threaded rod;
A double pipe holder comprising a protruding piece provided on the outer periphery of the other half annular body near the opening and closing end and having a groove for receiving the threaded rod.

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