Rod body suspension device and method for connecting the rod body

Abstract

To provide a rod body hanging tool etc. that can efficiently add and remove rod bodies.SOLUTION: A rod body hanging tool that hangs a rod body attached to a rod on the same axis above the rod that penetrates the ground in an upright position and is equipped with a drilling head at a tip comprises a drive shaft mounting member located coaxially with the rod and attached to the drive shaft of a drilling machine to which the rod is connected, a rod body mounting member attached to the rod body, a bendable connecting member provided on the drive shaft mounting member to hang the rod body mounting member.SELECTED DRAWING: Figure 5

Description

Technical Field

[0004] , , , , , ,

[0001] The present invention relates to a rod body hanger used for adding and removing a rod body constituting a rod to which a boring head is connected in a boring machine for excavating the ground, and a method for connecting the rod body.

Background Art

[0002] For example, Patent Document 1 discloses a drilling and stirring device used when constructing a soil-cement column in the ground. The drilling and stirring device includes a rod made of a steel pipe with a drilling bit connected to its tip, and drills the ground with the boring head by rotating the rod connected to the drive shaft of the rotating means around the axis. Further, the drilling and stirring device is configured such that the rotating means moves vertically along the guide member. When the rotating means reaches the lower end of the guide member, the connection state between the drive shaft and the steel pipe on the rear end side of the rod is released while holding the rod in the clamp at that position. Then, the rotating means is slid upward along the guide member, a new steel pipe is arranged between the held rod and the drive shaft, the rear end of this new steel pipe is connected to the drive shaft, and while sequentially adding a plurality of steel pipes forming the rod, the ground is drilled and stirred to a depth corresponding to the length of the soil-cement column to be constructed.

[0003] In addition, in order to reliably transmit the rotational motion from the rotating means to the drilling bit, one of the drive shaft, the steel pipes, the steel pipes themselves, and the steel pipe and the boring head is provided with a male joint having a square tube portion with a hexagonal horizontal cross section, and the other is provided with a female joint having a hexagonal hole portion. They are connected by a hexagonal joint type in which the male joint is fitted into the female joint, or a screw type in which a male thread is formed on the outer circumference of one and a female thread is formed on the inner circumference of the other and they are screwed together.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] When excavating the ground by sequentially adding rod bodies that constitute a rod, as in the multiple steel pipes described in Patent Document 1, the process of adding the rod bodies and removing them takes time. Therefore, it is desirable to reduce the number of rod bodies added and to reduce the number of times the rod bodies are added and removed. For this reason, there is a need to increase the length of the added rod bodies.

[0006] Furthermore, when connecting two rod bodies arranged vertically or a rod body extended from a drive shaft by screwing a male thread formed on the outer circumference of one rod body into a female thread formed on the inner circumference of the other, it is difficult to screw them together unless the connecting rod bodies or the drive shaft and rod body are arranged coaxially. Also, when connecting a projection that is approximately hexagonal in shape on one side to a square hole with a hexagonal cross-section on the other side by fitting them together, the rod bodies or the drive shaft and rod body must be arranged coaxially, and their orientation in the direction of rotation must also be precisely aligned; otherwise, the projection will not fit into the square hole, and the connection cannot be made.

[0007] Therefore, when connecting rod bodies to each other or a drive shaft to a rod body, it is necessary to accurately align the two. However, in low-headroom construction sites, there is not enough space to accommodate the crane's tip sheave directly above the rod body, and it is difficult to position the rod body to be connected directly above the rod body held at the lower end. Furthermore, it is difficult for a worker to manually support the heavy rod body and accurately align it with the rod body held at the lower end and the drive shaft. As explained above, the process of adding and removing sections from the rod itself was complicated, time-consuming, and inefficient.

[0008] The present invention has been made in view of the above problems, and its main objective is to provide a rod body suspension device and a method for connecting rod bodies that can efficiently extend and detach rod bodies. [Means for solving the problem]

[0009] To achieve this objective, the rod body suspension device of the present invention is a rod body suspension device that is installed in an upright position in the ground and has a drilling head at its tip, and above the rod, a rod body to be extended from the rod is suspended coaxially, and is located coaxially with the rod and on the drive shaft of the drilling machine to which the rod is connected. Surrounded and easily detachable It comprises a drive shaft mounting member to be attached, a rod body mounting member to be attached to the rod body, and a flexible connecting member provided on the drive shaft mounting member for suspending the rod body mounting member, An inclined surface is formed on the inner side of the lower end of the drive shaft mounting member. This inclined surface abuts against the upper surface of the drive shaft projection formed at the lower end of the drive shaft, and is formed with a smaller inclination than the upper surface of the drive shaft projection. It is characterized by the following:

[0010] The rod body suspension device of the present invention is characterized in that the drive shaft mounting member and the rod body mounting member are each formed in an annular shape by assembling two semicircular surrounding members that form a semicircular arc, and are attached to surround the drive shaft and the rod body around their axes.

[0011] The rod body suspension device of the present invention is characterized in that the two semicircular surrounding members are pin-connected at one end by a hinge pin so as to be rotatable, and the other ends are abutted against each other and overlap in the axial direction of the drive shaft, each having an engaging portion with a through hole that penetrates in the axial direction, and a removable fixing pin is inserted through each of the through holes when the engaging portions overlap to form an annular shape.

[0012] The rod body suspension device of the present invention has the drive shaft mounting member, The aforementioned The rod body mounting member is characterized by being mounted on the drive shaft projection and having its downward movement restricted, and having the rod projection that protrudes outward from the outer circumferential surface of the rod body mounted on it and having its upward movement restricted.

[0013] The rod body suspension device of the present invention is characterized in that a plurality of connecting members are provided and have the same length, and are arranged at equal intervals in the circumferential direction of the drive shaft mounting member and the rod body mounting member.

[0014] The rod body suspension device of the present invention is characterized in that the connecting member is a chain that is detachably provided with at least one of the drive shaft mounting member and the rod body mounting member.

[0015] According to the rod body suspension device of the present invention, the drive shaft mounting member, which is attached surrounding the drive shaft, and the rod body mounting member, which is attached surrounding the rod body, are connected by a connecting member, so that the rod body to which the rod body mounting member is attached can be suspended from the drive shaft. At this time, the drive shaft of the drilling machine to which the drive shaft mounting member is attached is located coaxially with the rod, which has a drilling head at its tip, so that the rod body to which the rod body mounting member connected to the drive shaft mounting member is attached can be suspended coaxially with the drive shaft and the rod.

[0016] As a result, even if the connection structure for joining the rod bodies is a so-called hexagonal joint consisting of, for example, a male joint with a hexagonal rectangular tube section and a female joint with a hexagonal rectangular hole section, by using the drive shaft to rotate and adjust the circumferential position of the rectangular tube section of the male joint and the rectangular hole section of the female joint, and then lowering it, the male joint can be smoothly engaged with the female joint, allowing the rod bodies to be extended. Furthermore, the rod bodies can be easily removed simply by raising the drive shaft. In this way, it becomes possible to efficiently extend and remove the rod bodies.

[0017] Furthermore, since the connecting member that connects the drive shaft mounting member and the rod body mounting member is flexible, even when the drive shaft mounting member is attached to the drive shaft, the orientation of the rod body mounting member can be changed by bending the connecting member. For this reason, even when the rod body is not positioned directly below the drive shaft, or when the rod body is not standing vertically, the orientation of the rod body mounting member can be adjusted to match the rod body, making it easy to attach the rod body mounting member to the rod body. Then, by suspending the rod body with the rod body mounting member attached from the drive shaft using a rod body suspension device, the rod body can be positioned coaxially with the drive shaft.

[0018] In this method, the rod body is directly suspended from the drive shaft using a rod body suspension device, eliminating the need for cranes or forklifts. This allows the suspended rod body to be positioned closer to the drilling machine. Furthermore, by directly suspending the rod body from the drive shaft using the rod body suspension device, the rod body can be connected to the drive shaft and the rod body, as well as to each other, in a stable state. This reduces the clearance between the drive shaft and the rod body, as well as between the rod bodies, when the rod body is suspended, allowing for a longer rod body length. Consequently, the number of rod bodies that need to be extended is reduced, decreasing the number of extension operations. In other words, the rod body can be extended efficiently, reducing man-hours and shortening the construction period.

[0019] Furthermore, since the suspended rod body is arranged coaxially with the rod to which the drive shaft and drilling head are attached, if the rod body and drive shaft are difficult to insert due to the intrusion of small foreign objects or excessive friction, the mechanism for lowering the drive shaft provided by the drilling machine can be used to lower the drive shaft and apply downward pressure. This makes connection easier.

[0020] Further, according to the rod body hoist of the present invention, the drive shaft mounting member and the rod body mounting member are formed in an annular shape by assembling two semi-circular surrounding members having a semi-arc shape, and the drive shaft and the rod body are mounted by surrounding them around the axis. Therefore, by simply mounting the drive shaft around the annular drive shaft mounting member and mounting the rod body around the annular rod body mounting member, the drive shaft and the rod body can be arranged coaxially.

[0021] Also, one end of each of the two semi-circular surrounding members is pivotally pinned together by a hinge pin, and the other ends are abutted against each other. In a state where they overlap, a fixing pin that can be inserted into and removed from a through hole provided in the engaging portion is inserted through to form an annular configuration. Therefore, by rotating the two semi-circular surrounding members around the hinge pin to which they are pinned together, widening the distance between them, arranging the drive shaft or the rod body inside, and abutting the other peripheral ends of the two semi-circular surrounding members against each other and inserting the fixing pin into the through hole, the drive shaft mounting member and the rod body mounting member can be easily mounted in a state of surrounding the drive shaft or the rod body around the axis. Further, by removing the fixing pin, the drive shaft mounting member and the rod body mounting member can be easily removed, so the workability is also excellent.

[0022] Further, according to the rod body hoist of the present invention, by simply mounting the drive shaft mounting member above the drive shaft protruding portion, it is possible to restrict the downward movement of the drive shaft mounting member, and by simply mounting the rod body mounting member below the rod protruding portion, it is possible to restrict the upward movement of the rod body mounting member. Therefore, by simply mounting the drive shaft mounting member above the drive shaft protruding portion and mounting the rod body mounting member below the rod protruding portion, the rod body can be easily suspended from the drive shaft.

[0023] Further, according to the rod body hoist of the present invention, since a plurality of connecting members having the same length are arranged at equal intervals in the circumferential direction of the drive shaft mounting member and the rod body mounting member, the rod body can be suspended from the drive shaft in a balanced manner in a posture along the vertical direction.

[0024] Further, according to the rod body hanger of the present invention, since the connecting member is a chain, it does not get entangled like a wire and does not deform. Therefore, since the posture of the rod body attachment member when suspended by entanglement does not change, the rod can be suspended from the drive shaft in a balanced manner in a posture along the vertical direction. Further, since it does not get entangled like a wire and does not deform, storage and management of the rod hanging jig are also easy.

[0025] Further, since the connecting member is detachably provided with at least one of the drive shaft attachment member and the rod body attachment member, it can be attached to the drive shaft and the rod body respectively in a state where the drive shaft attachment member and the rod body attachment member are separated, so it is more excellent in workability.

[0026] Further, the method for connecting the rod body of the present invention is characterized by having a suspension step of suspending the rod body from the drive shaft by the rod body hanger and a connection step of connecting the suspended rod body to the drive shaft or another rod body.

[0027] According to the method for connecting the rod body of the present invention, since the rod body is suspended from the drive shaft by the rod body hanger and connected, the operator does not need to support the rod body, and the rod body can be arranged coaxially with the drive shaft in a posture along the vertical direction by simply lifting it with the rod body hanger. Therefore, it is possible to easily join the rod body and the drive shaft.

Effect of the Invention

[0028] According to the present invention, it is possible to provide a rod body hanger and a method for connecting a rod body that can efficiently add and remove the rod body.

Brief Description of the Drawings

[0029] [Figure 1] It is a diagram showing a drilling machine used in an embodiment of the present invention. [Figure 2]This figure shows the rod body in an embodiment of the present invention. [Figure 3] This is a perspective view showing the connection between a convex joint and a concave joint in an embodiment of the present invention. [Figure 4] This is a perspective view showing the connection between a convex joint and a concave joint in an embodiment of the present invention. [Figure 5] This figure shows a rod body suspension device according to an embodiment of the present invention. [Figure 6] This diagram shows the drive shaft mounting member for the rod body suspension device. [Figure 7] This figure (Part 1) shows a method for connecting the rod body in an embodiment of the present invention. [Figure 8] This figure (part 2) shows a method for connecting the rod body in an embodiment of the present invention. [Modes for carrying out the invention]

[0030] The rod body suspension device and the method for connecting the rod body of the present invention will be described in detail with reference to Figures 1 to 8. In this embodiment, an example of using the rod body suspension device of the present invention when constructing an underground hole with a drilling machine will be described.

[0031] When constructing a borehole H using the drilling machine 1, as shown in Figure 1, a rod 2 is connected to the drive shaft 1b of the rotating device 1a of the drilling machine 1, and the drilling head 1c provided at the tip of the rod 2 is rotated to drill into the ground. A swivel joint 1d is attached to the middle of the drive shaft 1b, and the rod 2 is connected to the lower end of the drive shaft 1b which extends downward from the swivel joint 1d. The rod 2 is configured so that its length can be extended by connecting rod bodies 20, which are formed to a predetermined length, in a series along the axial direction of the drive shaft 1b.

[0032] The drilling machine 1 is mounted on a lifting body 1f, in which a rotating device 1a moves vertically along a guide 1e. When the rotating device 1a reaches the lower end of the guide 1e, the connection between the drive shaft 1b and the held rod body 20 is released and disconnected while the rod body 20, which is located at the uppermost position of the rod 2, is held by a chuck mechanism 1g. Then, by raising the lifting body 1f, the distance between the drive shaft 1b and the rod body 20 is increased, and a new rod body 20 is added to extend the rod body 20 in between, and the ground is drilled by sequentially adding multiple rod bodies 20 until the desired depth is reached. The rod body suspension device 3 of the present invention is used to suspend a rod body 20 to be added to the rod 2 coaxially above the rod 2, which is driven into the ground in an upright position and has a drilling head 1c at its tip.

[0033] ≪≪Rod and Rod Body≫≫ Rod 2 consists of a rod body 20 and a retaining member 4 that connects the rod body 20 in the axial direction. The base end, which is the upper end of Rod 2, is connected to the drive shaft 1b by the retaining member 4, and the tip end, which is the lower end, is connected to the drilling head 1c via the retaining member 4. The following describes the details of the rod body 20 and the retaining member 4 that make up rod 2.

[0034] As shown in Figure 2, the rod body 20 is provided with a pipe material 21 and a convex joint 22 and a concave joint 23 at both ends, and the fluid S supplied from the fluid supply pipe 1h flows down through the hollow sections 21a, 22a, and 23a that penetrate the rod body 20 in the axial direction. A concave joint 23 is also integrally provided at the lower end of the drive shaft 1b which is joined to the upper end of the rod 2, and a convex joint 22 is also integrally provided at the upper end of the shaft portion 1i of the drilling head 1c which is joined to the lower end of the rod 2, and these are connected to the rod body 20 and the retaining member 4, respectively, in the same way as the connection between the rod bodies 20.

[0035] The pipe material 21 is a single pipe with a hollow section 21a, similar to the drive shaft 1b and the shaft portion 1i of the drilling head 1c. A rod projection 21b is provided near the longitudinal center of the rod body 20, at a position higher than the center of gravity G, with a larger outer diameter than other parts, and protruding outward from the outer circumference.

[0036] The convex joint 22 consists of a cylindrical body fixed to the pipe material 21 by welding or the like. The base end, which is the lower end connected to the pipe material 21, is a cylindrical portion 22b whose cross-section is the same size and external shape as the pipe material 21, while the tip end, which is the upper end, is a rectangular tube portion 22c whose cross-section is smaller than that of the pipe material 21 and is formed in the shape of a hexagonal donut. A convex flange 22d is provided near the boundary between the cylindrical portion 22b at the base end and the rectangular tube portion 22c at the tip end. The convex flange 22d is formed to protrude from the outer surface of the cylindrical portion 22b, with its upper surface 22e being a horizontal plane and its lower surface 22f being sloped such that the thickness of the convex flange 22d gradually decreases towards the outer circumference.

[0037] As shown in Figure 2, the recessed joint 23 is formed as a housing cylinder portion 23b with a cross-section and outer shape similar to that of the pipe material 21 along its entire length, and the base end that connects to the pipe material 21 is in communication with the hollow portion 21a of the pipe material 21 via a hollow portion 23a. At the lower end, the tip side has a square hole portion 23c that fits with the square tube portion 22c of the convex joint 22 and communicates with the hollow portion 23a.

[0038] A concave flange 23d is provided at the tip of the storage cylinder portion 23b. The concave flange 23d is formed to protrude from the outer circumferential surface of the storage cylinder portion 23b, with its lower surface 23e being a horizontal plane and its upper surface 23f being sloped such that the thickness of the concave flange 23d gradually decreases towards the outer circumferential surface.

[0039] <<<Retaining Member>>> As shown in Figures 3(a) and 3(b), the retaining member 4 comprises split members 40 and 41, a bolt 42, and a nut 43.

[0040] As shown in Figure 3(a), the split members 40 and 41 are formed by cutting a ring-shaped member in half, with a size that can surround the convex flange 22d of the convex joint 22 and the concave flange 23d of the concave joint 23. Both ends of the split members 40 and 41 are provided with radially projecting lugs 40a and 41a. Bolt holes are formed in these lugs 40a and 41a through which bolts 42 pass.

[0041] Furthermore, fitting grooves 40b and 41b, which are continuous in the circumferential direction, are formed on the inner circumferential surfaces of the split members 40 and 41. As shown in Figure 4, the cross-sectional shape is formed to fit with the convex flange 22d and concave flange 23d when they are inserted in a state where the upper surface 22e of the convex joint 22 and the lower surface 23e of the concave joint 23 are abutted together. As shown in Figure 3(a), the retaining member 4 is arranged so as to surround the abutted convex flange 22d and concave flange 23d, and these are inserted into the fitting grooves 40b and 41b to fit them together.

[0042] Then, as shown in Figure 3(b), the bolt 42 is inserted through the bolt holes formed in the lugs 40a and 41a, and the nut 43 is screwed on and tightened. As the nut 43 is screwed onto the bolt 42 inserted through the bolt hole, as shown in Figure 4, the convex flange 22d and the concave flange 23d are fully fitted into the fitting grooves 40b and 41a, increasing the tightening force in the vertical direction, and the split members 40 and 41 form an annular shape, connecting the convex flange 22d and the concave flange 23d.

[0043] <<Rod body suspension device>> As shown in Figure 5, the rod body suspension device 3 includes a drive shaft mounting member 30 that surrounds the drive shaft 1b around its axis, a rod body mounting member 31 that surrounds the rod body 20 around its axis, and two chains 32 that serve as connecting members for linking the drive shaft mounting member 30 and the rod body mounting member 31. The drive shaft mounting member 30 and the rod body mounting member 31 have almost identical shapes. Here, the configuration will be explained using the drive shaft mounting member 30 as an example.

[0044] As shown in Figure 6, the drive shaft mounting member 30 has two semicircular surrounding members 301 and 302 that form a semicircular arc, and one end of the arcs of the two semicircular surrounding members 301 and 302 is rotatably joined by a hinge pin 30a. Therefore, the two semicircular surrounding members 301 and 302 are configured to open and close so that the distance between the other ends of the arcs widens, from a state in which the other ends of the arcs are abutted against each other to form a ring.

[0045] In the state where the two semicircular surrounding members 301 and 302 form an annular shape, the inner diameter of the drive shaft mounting member 30 is slightly larger than the outer diameter of the drive shaft 1b and is sufficiently smaller than the outer diameter of the concave flange 23d provided at the lower end of the drive shaft 1b, so that the two semicircular surrounding members 301 and 302 surround the drive shaft 1b inside them when they form an annular shape. In the case of the rod body mounting member 31, the inner diameter in the annular shape is slightly larger than the outer diameter of the rod body 20 and is sufficiently smaller than the outer diameter of the rod projection 21b provided on the rod body 20.

[0046] At the other ends of the arcs of the two semicircular surrounding members 301 and 302, engaging portions 301b and 302b are provided, respectively, with vertical through-holes 301a and 302a that penetrate the axial direction, i.e., vertical direction, of the surrounding drive shaft 1b. One semicircular surrounding member 301 has engaging portions 301b at both ends in the axial direction, while the other semicircular surrounding member 302 has an engaging portion 301b in the center in the axial direction. When the other ends of the arcs of the two semicircular surrounding members 301 and 302 are butted together, the engaging portion 301b of the other semicircular surrounding member 302 is positioned between the engaging portions 301b of the one semicircular surrounding member 301, and the engaging portions 301b and 302b are arranged to overlap in the vertical direction. At this time, the vertical through holes 301a and 302a provided in each engaging portion 301b and 302b communicate in the vertical direction.

[0047] The two semicircular surrounding members 301 and 302 are maintained in an annular shape by inserting a fixing pin 303 from above through the vertical through holes 301a and 302a, which are connected in the vertical direction. The fixing pin 303 has a pin body portion 303a with an outer diameter slightly smaller than the inner diameter of each vertical through hole 301a and 302a, a pin head portion 303b provided at the upper end of the pin body portion 303a and having a larger diameter than the pin body portion 303a, and a gripping portion 303c provided above the pin head portion 303b.

[0048] When the fixing pin 303 is inserted from above into the communicating vertical through holes 301a and 302a, the pin head 303b rests on the upper engaging portion 301b provided on one of the semicircular surrounding members 301, and the pin body 303a remains in a state where it penetrates each of the vertical through holes 301a and 302a. Therefore, the drive shaft mounting member 30 can be attached to the drive shaft 1b by simply inserting the fixing pin 303 into each of the vertical through holes 301a and 302a while the two semicircular surrounding members 301 and 302 surround the drive shaft 1b, thereby joining the two semicircular surrounding members 301 and 302 in an annular shape. Furthermore, the two semicircular surrounding members 301 and 302 can be opened and removed from the drive shaft 1b simply by pulling the gripping portion 303c upward.

[0049] Each semicircular surrounding member 301, 302 is provided with projections 301c, 302c that extend from the center of the arc outward, and each projection 301c, 302c is provided with horizontal through holes 301d, 302d that penetrate horizontally for securing the chain 32.

[0050] Furthermore, the lower surfaces of the arc portions of the two semicircular surrounding members 301 and 302 are provided with inclined surfaces 301e and 302e, where the width in the vertical direction gradually narrows from the outer circumference to the inner circumference. The inclination of these inclined surfaces 301e and 302e is smaller than the inclination provided on the upper surface 23f of the recessed flange 23d, which is a drive shaft projection provided on the recessed joint 23 of the drive shaft 1b and is provided to protrude outward from the outer circumference.

[0051] The drive shaft mounting member 30 is attached to the upper side of the concave flange 23d provided at the lower end of the drive shaft 1b, and the rod body mounting member 31 is attached to the lower side of the rod projection 21b provided above the center of gravity G of the rod body 20, and the two are connected by two chains 32. The two chains 32 are of the same length, and each has a hook 32a with a latch at both ends.

[0052] Then, with the rod body suspension device 3 attached to the drive shaft 1b and the rod body 20, when the drive shaft 1b is lifted, the drive shaft mounting member 30 is placed on the concave flange 23d, restricting its downward movement, and the rod projection 21b is placed on the rod body mounting member 31, restricting its upward movement, thereby suspending the rod body 20 from the drive shaft 1b by the rod body suspension device 3.

[0053] At this time, the drive shaft mounting member 30, which is pulled downward by the weight of the rod body 20, has inclined surfaces 301e and 302e on the lower surface of the arc portion that come into contact with the inclined upper surface 23f of the concave flange 23d provided at the lower end of the drive shaft 1b. The inclination of the upper surface 23f of the concave flange 23d, to which the inclined surfaces 301e and 302e come into contact is smaller for the inclined surfaces 301e and 302e. Therefore, when pressed downward by the weight of the rod body 20, the drive shaft mounting member 30 is pressed more strongly, resulting in a more stable state.

[0054] Furthermore, in order to ensure that the suspended rod body 20 maintains a stable posture, the rod projection 21b, which rests on the rod body mounting member 31, is positioned above the center of gravity G of the rod body 20, and the length of the chain 32 is adjusted to a length that allows for slack when the rod body 20 is suspended using the rod body suspension device 3.

[0055] ≪Procedure for extending the rod body≫ As shown in Figure 1, the underground hole H is drilled by a drilling machine 1 in which the convex joint 22 of the shaft portion 11 and the concave joint 23 of the rod body 20 are fitted together and a retaining member 4 is attached to connect the shaft portion 11 and the rod body 20, and the convex joint 22 of the rod body 20 and the concave joint 23 of the drive shaft 1b are fitted together and a retaining member 4 is attached to connect the rod body 20 and the drive shaft 1b.

[0056] As drilling progresses, as shown in Figure 7(a), the drilling head 1c descends, and when the drive shaft 1b to which the rod 2 is connected moves near the upper end of the chuck mechanism 1g, the rotating device 1a is temporarily stopped. The rod body 20, which constitutes the rod 2, is gripped by the chuck mechanism 1g, and in this state, the retaining member 4 connecting the rod body 20 and the drive shaft 1b is removed.

[0057] With the retaining member 4 removed, the lifting body 1f, on which the rotating device 1a is installed, is raised along the guide 1e, as shown in Figure 7(b). This exposes the convex joint 22 provided at the upper end of the gripped rod body 20 and the concave joint 23 provided at the lower end of the drive shaft 1b.

[0058] Then, the drive shaft 1b is surrounded by the drive shaft mounting member 30 on the upper side of the concave flange 23d of the drive shaft 1b, and the fixing pins 303 are inserted into the respective vertical through holes 301a and 302a to attach the drive shaft mounting member 30 to the drive shaft 1b, thereby suspending the rod body suspension device 3 from the drive shaft 1b.

[0059] Next, as shown in Figure 7(c), the new rod body 20 connected to the drive shaft 1b is placed on a trolley 5 or the like in an inclined position, and the rod body 20 is positioned so that the convex joint 22 of the rod body 20 is located near the drive shaft 1b from which the rod body suspension device 3 is suspended.

[0060] Then, below the rod projection 21b provided on the rod body 20, the rod body mounting member 31 of the rod body suspension device 3 surrounds the rod body 20, and the fixing pins 303 are inserted into each vertical through hole to attach the rod body mounting member 31 to the rod body 20. At this time, the height of the drive shaft 1b is adjusted so that the rod body 20 can be surrounded by the rod body mounting member 31 by bending the chain 32 and changing the orientation of the rod body mounting member 31.

[0061] After attaching the rod body mounting member 31 to the rod body 20, the lifting body 1f on which the rotating device 1a is installed is raised along the guide 1e, and the trolley 5 is moved away from the drilling machine 1, so that the new rod body 20 is suspended from the drive shaft 1b by the rod body suspension device 3 as shown in Figure 8(a) (suspension process). At this time, the drive shaft 1b, the new rod body 20, and the rod body 20 held by the chuck mechanism 1g are arranged coaxially.

[0062] Then, using the drive shaft 1b, the circumferential position of the rectangular hole 23c of the recessed joint 23 of the new rod body 20 and the rectangular tube 22c of the convex joint 22 of the rod body 20 held by the chuck mechanism 1g is rotated and adjusted. After that, the lifting body 1f is lowered along the guide 1e to engage the convex joint 22 of the rod body 20 held by the chuck mechanism 1g with the recessed joint 23 of the new rod body 20.

[0063] In this case, since the rod body 20 is suspended from the drive shaft 1b, if the rod body 20 and the drive shaft 1b are difficult to fit together due to the intrusion of small foreign objects or excessive friction, or if the gripped rod body 20 and the new rod body 20 are difficult to fit together, the feed force of the lifting body 1f of the drilling machine 1 can be used to apply downward pressure and push the rod body 20 straight in.

[0064] Then, as shown in Figure 8(b), the retaining member 4 is attached to connect the rod body 20 held by the chuck mechanism 1g to the new rod body 20 (connection step). After this, the height position of the drive shaft 1b is adjusted as appropriate using the lifting body 1f, and the convex joint 22 of the new rod body 20 is fitted to the concave joint of the drive shaft 1b, and the retaining member 4 is attached to them to connect the new rod body 20 to the drive shaft 1b (connection step).

[0065] Subsequently, the rod body suspension device 3 is removed by pulling out the fixing pins 303 of the drive shaft mounting member 30 and the rod body mounting member 31, the chuck mechanism 1g is released, the rotating device 1a is activated, and the construction work of the underground hole H is resumed.

[0066] When removing the underground borehole H after the construction work is completed, first, with the upper end of the rod body 20 attached below the drive shaft 1b being gripped by the chuck mechanism 1g, the retaining member 4 connecting the drive shaft 1b and the rod body 20, and the retaining members 4 connecting the rod bodies 20 to each other are removed. Next, the drive shaft mounting member 30 is attached to the drive shaft 1b, and the rod body mounting member 31 is attached to the rod body 20 connected to the drive shaft 1b, thereby mounting the rod body suspension device 3.

[0067] Subsequently, by raising the lifting body 1f, on which the rotating device 1a is installed along the guide 1e, the rod body 20 is straightened up together with the drive shaft 1b. As a result, the rod body 20 is suspended from the drive shaft 1b via the rod body suspension device 3 and can be easily removed.

[0068] In this embodiment, the rod body suspension device 3 is configured such that the drive shaft mounting member 30 and the rod body mounting member 31 are pin-connected at one end of the semicircular arcs of two semicircular surrounding members 301 and 302 by a hinge pin 30a so as to be rotatable, and the other ends of the semicircular arcs are abutted against each other, with a removable fixing pin 303 inserted through vertical through holes 301a and 302a provided in the overlapping engaging portions 301b and 302b, forming an annular ring. Therefore, by rotating the two semicircular surrounding members 301 and 302 around the hinge pin 30a to widen the distance between them, and then positioning the drive shaft 1b or rod body 20 inside, the other ends of the two semicircular surrounding members 301 and 302 are brought together and the fixing pin 303 is inserted through the vertical through holes 301a and 302a, making it possible to easily attach the drive shaft mounting member 30 and the rod body mounting member 31 in a state that surrounds the drive shaft 1b or rod body 20 around its axis. Furthermore, by removing the fixing pin 303, the drive shaft mounting member 30 and the rod body mounting member 31 can be easily removed. Therefore, it is also excellent in terms of workability.

[0069] Furthermore, by simply attaching the drive shaft mounting member 30 to the upper side of the concave flange 23d provided at the lower end of the drive shaft 1b, it becomes possible to restrict the downward movement of the drive shaft mounting member 30, and by simply attaching the rod body mounting member 31 to the lower side of the rod protrusion 21b, it becomes possible to restrict the upward movement of the rod body mounting member 31. For this reason, by simply attaching the drive shaft mounting member 30 to the upper side of the concave flange 23d and the rod body mounting member 31 to the lower side of the rod protrusion 21b, the rod body 20 can be easily suspended from the drive shaft 1b.

[0070] In this configuration, the drive shaft mounting member 30 and the rod body mounting member 31 are formed in an annular shape by assembling two semicircular surrounding members 301 and 302 that form a semicircular arc, and are mounted to surround the drive shaft 1c and the rod body 20 around their axes. Therefore, by simply mounting the drive shaft 1c to the annular drive shaft mounting member 30 and mounting the rod body 20 to the annular rod body mounting member 31, it becomes possible to arrange the drive shaft 1c and the rod body 20 coaxially.

[0071] In this way, by suspending the rod body 20 from the drive shaft 1b, it becomes possible to position the rod body 20 coaxially with the drive shaft 1b. Furthermore, when connecting a new rod body 20 between the drive shaft 1b and the rod body 20 on which the drilling head 1c is attached, it becomes possible to position the rod body 20 held by the chuck mechanism 1g below the drive shaft 1b and the new rod body 20 coaxially.

[0072] Therefore, by using the drive shaft 1b from which the new rod body 20 is suspended, the circumferential position of the rectangular hole 23c of the recessed joint 23 of the new rod body 20 and the rectangular tube 22c of the convex joint 22 of the rod body 20 held by the chuck mechanism 1g can be rotated to adjust their positions. Then, by simply lowering the lifting body 1f along the guide 1e, the convex joint 22 of the rod body 20 held by the chuck mechanism 1g and the recessed joint 23 of the new rod body 20 can be fitted together. Furthermore, the rod body 20 can be easily removed simply by raising the drive shaft 1b. In this way, it is possible to efficiently perform the extension and removal of the rod body 20.

[0073] Furthermore, since the two chains 32 are of the same length and are positioned in the center of the arc in the circumferential direction of the semicircular surrounding members 301 and 302 of the drive shaft mounting member 30 and the rod body mounting member 31, it is possible to suspend the rod body 20 from the drive shaft 1b in a balanced manner in a position aligned with the vertical direction.

[0074] Furthermore, since the chain 32 connecting the drive shaft mounting member 30 and the rod body mounting member 31 with a gap between them is bendable, even when the drive shaft mounting member 30 is attached to the drive shaft 1b, the orientation of the rod body mounting member 31 can be changed by bending the chain 32. For this reason, even when the rod body 20 is not positioned directly below the drive shaft 1b, or when the rod body 20 is not standing vertically, the orientation of the rod body mounting member 31 can be easily changed to accommodate the newly connected rod body 20, and the rod body mounting member 31 can be attached to the rod body 20. Then, by suspending the rod body 20 with the rod body mounting member 31 attached from the drive shaft 1b using the rod body suspension device 3, it becomes possible to position it coaxially with the drive shaft 1b.

[0075] In the above embodiment, an example was described in which a rod body suspension device 3, in which a drive shaft mounting member 30 and a rod body mounting member 31 are connected by a chain 32, is attached to the drive shaft 1b, and then a new rod body 20 is attached to the rod body mounting member 31 suspended from the drive shaft 1b. However, the invention is not limited to this example. For example, the drive shaft mounting member 30 attached to the drive shaft 1b and the rod body mounting member 31 attached to the new rod body 20 may be connected by the chain 32. Alternatively, the chain 32 attached to either the drive shaft mounting member 30 or the rod body mounting member 31 may be connected to the other attached to either the drive shaft 1b or the rod body 20.

[0076] In this embodiment, when the chain 32 is detachably attached to either the drive shaft mounting member 30 or the rod body mounting member 31, it is possible to attach the chain to the drive shaft 1b and the rod body 20 respectively while the drive shaft mounting member 30 and the rod body mounting member 31 are separated, thus increasing the degree of freedom in the work and improving workability. The chain 32 may also be detachably attached to only one of the drive shaft mounting member 30 or the rod body mounting member 31, or it may be permanently attached to either the drive shaft mounting member 30 or the rod body mounting member 31.

[0077] Furthermore, the chain 32 does not twist or deform like a wire. Therefore, the posture of the rod body mounting member 31 does not change due to twisting when suspended, making it possible to suspend the rod body 20 from the drive shaft 1b in a balanced manner in a vertical orientation. Also, since it does not twist or deform like a wire, storage and management of the rod body suspension device 3 are easy.

[0078] Furthermore, in this embodiment, the rod body connection method involves suspending the rod body 20 directly from the drive shaft 1b using the rod body suspension device 3, thus eliminating the need for cranes or forklifts. Therefore, even in low-headroom or confined spaces, the rod body 20 can be easily positioned vertically below the drive shaft 1b. When a new rod body 20 is to be interposed between the detached drive shaft 1b and the rod body 20 held by the chuck mechanism 1g, the rod body 20 can be suspended directly from the drive shaft 1b using the rod body suspension device 3, ensuring the rod body 20 is stable. This allows for the connection of the drive shaft 1b, the rod body 20, the held rod body 20, and the new rod body 20.

[0079] In this case, since heavy machinery is not used, the workspace required to position the new rod body 20 between the drive shaft 1b and the gripped rod body 20 can be made smaller. As a result, the clearance between the drive shaft 1b and the rod body 20, and the clearance between the gripped rod body 20 and the new rod body 20 can be reduced when the rod body 20 is suspended, making it possible to secure a longer length for the rod body 20. Therefore, by reducing the number of rod bodies 20 to be added, the number of extension operations is reduced, which reduces the number of man-hours and shortens the construction period.

[0080] Furthermore, since the rod body 20 suspended from the drive shaft 1b by the rod body suspension device 3 is positioned coaxially with the drive shaft 1b and the gripped rod body 20, the suspended rod body 20 can be easily connected to the drive shaft 1b and the gripped rod body 20 by lowering the drive shaft 1b. Also, when removing the rod body 20, it can be pulled straight up by the drive shaft 1b, so the rod body 20 can be smoothly lifted and easily removed.

[0081] In the above embodiment, an example was described in which a rod projection 21b is provided that protrudes around the entire circumference of the rod body 20, but the invention is not limited to this. For example, a plurality of projections protruding outward from the outer surface of the rod body 20 are provided at approximately equal intervals in the circumferential direction, or any other configuration in which the rod body mounting member 31 is supported so that the rod body 20 is aligned with the vertical direction.

[0082] Furthermore, in the above embodiment, an example was described in which the recessed flange 23d of the recessed joint 23 of the drive shaft 1b and the convex flange 22d of the convex joint 22 of the rod body 20 are connected by a retaining member 4. However, the invention is not limited to this, and for example, the drive shaft 1b and the rod body 20 may be connected by forming a male thread on the outer circumference of either the drive shaft 1b or the rod body 20 and screwing it into a female thread formed on the outer circumference of the other. In this case, if the drive shaft 1b is not provided with a recessed flange 23d on which the drive shaft mounting member 30 is placed, the outer circumference of the drive shaft 1b is provided with a protruding portion that projects outward and on which the drive shaft mounting member 30 can be placed.

[0083] In the above embodiment, an example was described in which a chain 32 is provided as a connecting member of the rod body suspension device 3. However, the connecting member may be a wire, for example, as long as it is a flexible member that connects the drive shaft mounting member 30 and the rod body mounting member 31. Also, in the above embodiment, an example was described in which the drive shaft mounting member 30 and the rod body mounting member 31 are connected by two chains 32. However, there may be three or more chains as long as they are arranged at equal intervals in the circumferential direction. [Explanation of Symbols]

[0084] 1. Drilling machine 1a Rotating device 1b Drive shaft 1c drilling head 1d Swivel joint 1e Guide 1st floor elevator 1g chuck mechanism 1h Fluid supply pipe 1i Shaft 2 rods 3 rod body suspension device 4. Retaining member 5 carts 11 Shaft 20 Rod body 21 Piping material 21a Hollow part 21b Rod protrusion 22 Convex joint 22a Hollow part 22b Cylindrical part 22c Square tube part 22d Convex flange 22e top side 22f Bottom 23 Recessed joint 23a Hollow part 23b Storage cylinder section 23c Square hole 23d Concave side flange 23e Bottom 23f top surface 30 Drive shaft mounting member 30a Hinge pin 31 Rod body mounting component 32 chain 32a Hook 40 Half-split members 40a ears 40b Fitting groove 42 volts 43 nuts 301 Semicircular surrounding member 301a Vertical through hole 301b Engagement part 301c protrusion 301d horizontal through hole 301e Slope 302 Semicircular surrounding member 303 Fixing pin 303a Pin body 303b Pin head 303c grip part G Rod body center of gravity H underground hole S fluid

Claims

1. A rod body suspension device for which a rod body to be extended from a rod is suspended coaxially above a rod that is driven into the ground in an upright position and has a drilling head at its tip, A drive shaft mounting member is located coaxially with the aforementioned rod and is detachably attached to surround the drive shaft of the drilling machine to which the rod is connected, A rod body mounting member attached to the rod body, The drive shaft mounting member is provided with a flexible connecting member that suspends the rod body mounting member, An inclined surface is formed on the inner side of the lower end of the drive shaft mounting member. The rod body suspension device is characterized in that the inclined surface abuts against the upper surface of the drive shaft projection formed at the lower end of the drive shaft, and is formed with a smaller inclination than the upper surface of the drive shaft projection.

2. A rod body suspension device according to claim 1, The rod body suspension device is characterized in that the drive shaft mounting member and the rod body mounting member are each formed in an annular shape by assembling two semicircular surrounding members that form a semicircular arc, and are attached to surround the drive shaft and the rod body around their axes.

3. A rod body suspension device according to claim 2, The two semicircular surrounding members are, One end of each end is pin-connected to the other so as to be rotatable by a hinge pin. The other end has an engaging portion which is abutted against the other and overlaps with the other in the axial direction of the drive shaft, and each has a through hole that penetrates in the axial direction. A rod body suspension device characterized in that, with the aforementioned engaging portions overlapping, removable fixing pins are inserted through each of the aforementioned through holes to form an annular ring.

4. A rod body suspension device according to claim 2, The drive shaft mounting member is placed on the drive shaft projection and its downward movement is restricted. The rod body mounting member is characterized in that a rod projection that protrudes outward from the outer circumferential surface of the rod body is placed on it, thereby restricting upward movement of the rod body.

5. A rod body suspension device according to claim 2, Multiple connecting members are provided and have the same length. A rod body suspension device characterized in that the drive shaft mounting member and the rod body mounting member are arranged at equal intervals in the circumferential direction.

6. A rod body suspension device according to claim 1, The rod body suspension device is characterized in that the connecting member is a chain that is detachably provided to at least one of the drive shaft mounting member and the rod body mounting member.

7. A method for connecting a rod body using a rod body suspension device according to any one of claims 1 to 6, A suspension step in which the rod body is suspended from the drive shaft by the rod body suspension device, A connection step of connecting the suspended rod body to the drive shaft or another rod body, A method for connecting a rod body, characterized by having the following features.

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