JP3983179B2 - Protrusion rod loosening stop for excavation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the boring machine for ground improvement, the present invention relates to the prevention of the loosening of the propulsion rod for excavation for fixing the connecting portion between the propulsion rod and a swivel joint for supplying excavation soil excavation water and ground improvement chemical into the propulsion rod. Concerning ingredients.
[0002]
[Prior art]
In construction work sites such as structures such as bridges and buildings, a ground improvement agent is injected into the ground to improve the ground suitable for construction. A boring machine used for such ground improvement is configured to propel a propulsion rod (propulsion pipe) with a drilling pit attached to the tip while propelling it into the ground. It is configured to connect and extend.
[0003]
Further, a swivel joint (rotary joint) for injecting excavated sediment water and ground improvement chemicals into the ground through the propelling rod is attached to the base end (upper end) of the propelling rod.
[0004]
The connecting portion of the propulsion rod is used in addition through a pipe taper screw that is tightened by rotation during excavation, and the connecting portion between the propulsion rod and the swivel joint is also used for a tube that is tightened by rotation during excavation. It is connected by a taper screw.
[0005]
In the above configuration, the pipe taper screw of the connection part is formed in a direction to be tightened by rotation during excavation propulsion, but because of vibration, the connection part of the propulsion rod and the swivel joint is loosened, the connection part is released and the swivel joint There were many accidents of falling. If the swivel joint falls, the work will be interrupted and the pumping water and ground improvement chemical will be ejected, and it will be heavy and will hit the worker and cause serious injury and damage the boring machine. Become.
[0006]
As such a screw locking mechanism, for example, Patent Document 1 discloses a propulsion rod locking mechanism. In Patent Document 1, as shown in FIG. 10, the rod adapter 2 is formed with a reduced diameter portion 2C, and the drive shaft 1 is formed with a recess 1B. A ring 6 having a reduced diameter portion 8A and an annular convex portion 9A that respectively engage with the diameter portion 2C and the concave portion 1B, a holder 5 that fits outside the ring 6, and a snap ring 7 that prevents the ring 6 from coming off from the holder 5. It consists of
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-240389 (FIGS. 1 and 2)
[0008]
[Problems to be solved by the invention]
According to the above configuration, the rod adapter 2 and the drive shaft 1 can be satisfactorily prevented, but it is necessary to form the reduced diameter portion 2C in the rod adapter 2 in advance and the recess 1B in the drive shaft 1 in advance. Although it is suitable for a propulsion rod manufactured from now on, when applied to a currently used boring apparatus, all the propulsion pipes need to be replaced, which is impossible.
[0009]
The present invention solves the above-described problems, can be applied to existing propulsion rods and swivel joints without any changes, and can effectively prevent loosening of the connecting propulsion rods. The purpose is to provide ingredients.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a slack stop for a drilling propulsion rod for preventing a screw-type connection portion connecting a propulsion rod that is rotationally driven by a boring machine and a swivel joint. A cylindrical main body loosely fitted to the connecting portion to form a large-diameter portion; and a rod-side nut member externally fitted to a rod-side male screw portion formed on the propulsion rod side of the large-diameter portion of the cylindrical main body. A joint-side nut member fitted on a joint-side male thread portion formed on the swivel joint side of the large-diameter portion, and a plurality of slots on each of the rod-side male thread portion and the joint-side male thread portion in the axial direction And a tapered portion capable of being reduced in diameter by tightening at least one of the female threaded portion and the rod-side male threaded portion of the rod-side nut member, and at least one of the female-threaded portion and the joint-side male threaded portion of the joint-side nut member. Formed, the formation direction of the rod-side externally threaded portion and the joint side externally threaded portion, and is formed so as to be biased in the tightening direction during excavation rotation of the propulsion rod.
[0011]
According to the above configuration, the cylindrical main body is externally fitted over the propulsion rod and the swivel joint to the screw-type connection portion, the rod side nut member and the joint side nut member are tightened, and the rod side male screw portion and the joint are connected via the slot. The propulsion rod and the cylindrical main body can be fixed to each other via the cylindrical main body by reducing the diameter of the side male screw portions and press-contacting them. As a result, even if the propulsion rod is rotationally driven with vibration, the rod side nut member and the joint side nut member are urged to rotate in the tightening direction. There is no risk of coming off.
[0012]
Moreover, since the propulsion rod and the swivel joint do not require any shape change or expansion, it can be easily applied to the existing propulsion rod and swivel joint.
Furthermore, even if the connecting screw part is removed due to some mistake such as a tightening failure, the cylindrical body is fitted around the connecting screw part, so that the liquid injected from the swivel joint is not scattered around.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Here, an embodiment of the loosening stopper for the excavation propulsion rod according to the present invention will be described based on the drawings.
[0014]
As shown in FIG. 2, a boring machine 13 having a propulsion rod 12 with a loosening stop 11 according to the present invention is capable of gripping and releasing the propulsion rod 12 on a main body 15 on which a hydraulic unit 14 is mounted, and a propulsion hydraulic motor. A hydraulic chuck 16 that is rotationally driven by a motor (not shown), a propulsion screw cylinder 17 that is suspended from the hydraulic chuck 16 and is loosely fitted with the propulsion rod 12, and is screwed into the propulsion screw cylinder 17 for propulsion. A female screw member 18 that is driven forward and backward by a hydraulic motor (not shown) and a pair of left and right propulsion cylinders 19 that can propel and retract the hydraulic chuck 16 and assist the propulsion of the propulsion screw cylinder 17 are provided. .
[0015]
The propulsion rod 12 is configured such that a drilling bit 20 is attached to a distal end portion (lower end portion), and a plurality of the drill rods 12 are joined via a connecting portion 21 made of a pipe taper screw to be drilled to a predetermined depth. A swivel joint (rotary joint) 22 is attached to the (upper end), and the loosening stopper 11 is attached to the connection part (screw type connection part) 23 of the propulsion rod 12 and the swivel joint 22 shown in FIG. .
[0016]
As shown in FIG. 1, the propulsion rod 12 is configured as a double pipe by an inner cylinder portion 12b fitted on the same axis through a support member 12c in the outer cylinder portion 12a. It is configured to separately supply a hardening agent (two kinds of agents) for water glass grout, inject into the ground from the vicinity of the excavation bit 21 and mix and harden in a short time. An outer female screw portion (tube taper screw) 12c and an inner male screw portion (tube taper screw) 12d are formed in the outer tube portion 12a and the inner tube portion 12b at the base end portion (upper end portion) of the propulsion rod 12, respectively. .
[0017]
The swivel joint 22 has an inner cylindrical body 22b disposed on the same axis in a main body 22a to form inner and outer passages 22c and 22d, and communicates with the outer passage 22d through a bearing 22e and a seal ring (not shown). A casing 22h in which an inlet 22f is formed is externally fitted, and a connecting inner tube 22k is connected to the inner cylindrical body 22b via a bearing 22e and a seal ring (not shown), and the inlet of the connecting inner tube 22k 22g communicates with the inner passage 22c. Further, an outer male screw portion (taper taper screw) 22i is formed at the tip (lower end) of the main body 22a, and an inner female screw portion (taper taper screw) 22j is formed at the tip of the inner cylinder 22b.
[0018]
Therefore, the connection portion 23 between the propulsion rod 12 and the swivel joint 22 is screwed into the outer female screw portion 12c formed in the outer cylinder portion 12a of the propulsion rod 12 with the outer male screw portion 22i of the swivel joint 22. The internal female screw portion 22j of the swivel joint 22 is screwed to and connected to the internal male screw portion 12d formed in the inner cylinder portion 12b.
[0019]
The loosening stopper 11 according to the present invention includes a cylindrical main body 31 that is externally fitted to the connection portion 23 with a predetermined gap, and a rod-side nut member 32 that is externally fitted to the propelling rod 12 side of the cylindrical main body 31. And a joint-side nut member 33 fitted on the swivel joint 22 side.
[0020]
As shown in FIGS. 3 to 9, the cylindrical main body 31 has a propulsion rod, a large-diameter portion 31 a formed on at least two opposing surfaces on a flat locking surface 31 b, and the large-diameter portion 31 a on the propulsion rod 12 side. A small-diameter rod-side male screw portion 31c formed on the swivel joint 22 side of the large-diameter portion 31a, a small-diameter joint-side male screw portion 31d, and the rod-side male screw portion 31c and the joint-side male screw portion 31d at a constant angle. A plurality of (four in the figure) slits 31e and 31f formed in the axial direction are formed.
[0021]
The rod-side male screw portion 31c and the joint-side male screw portion 31d are each formed as a square parallel screw (or trapezoidal parallel screw) that is not easily loosened by vibration or rotation. The rod-side male thread portion 31c is configured as a right-hand screw that is rotated and biased by the right rotation of the propulsion rod 12 during excavation (clockwise in plan view) and the rod-side nut member 32 moves upward and tightens. The joint-side male thread portion 31d is configured as a left-hand screw that is urged to rotate by the right rotation of the propulsion rod 12 during excavation and the joint-side nut member 33 moves downward and tightens.
[0022]
The rod-side nut member 32 is formed in a cylindrical shape, flat engagement surfaces 32b are formed on at least two opposing outer peripheral surfaces, and a female screw portion 32a that can be fitted to the rod-side male screw portion 31c is formed on the inner surface. Has been. The rod-side female thread portion 32a is formed by forming a taper portion 32c having a taper angle α, the diameter of which is reduced toward the lower portion, in a trough portion in a predetermined range on the outside, and by tightening the rod-side nut member 32, The cylindrical main body 31 can be fastened and fixed to the propelling rod 12 by reducing the diameter of the rod-side male thread portion 31c via the split 31d.
[0023]
Further, the joint-side nut member 33 has a cylindrical shape, a flat locking surface 33b is formed on two opposing outer peripheral surfaces, and a female screw portion 33a that can be fitted to the rod-side male screw portion 31c is formed on the inner surface. . The rod-side female thread portion 33a is formed by forming a taper portion 33c having a taper angle α that is reduced in diameter toward the upper portion in a valley portion in a predetermined range on the outer side, and by tightening the joint-side nut member 33, The diameter of the joint-side male thread portion 32d can be reduced via the split 31f, and the cylindrical main body 31 can be fastened and fixed to the propulsion rod 12.
[0024]
In the above configuration, after the loosening stopper 11 is fitted into the propulsion rod 12 held by the hydraulic chuck 16 from the upper end side, the swivel joint 22 is connected and tightened via the connecting portion 23. Next, the loosening stopper 11 is moved to the connection portion 23, the rod side nut member 32 is tightened to reduce the diameter of the rod side male screw portion 31 c, and the cylindrical main body 31 is fixed to the propulsion rod 12. Next, the joint-side nut member 33 is tightened to reduce the diameter of the joint-side male thread portion 31 d, and the cylindrical main body 31 is fixed to the main body 22 a of the swivel joint 22.
[0025]
When excavation is started by the boring machine 13, the propulsion rod 12 is rotated rightward (clockwise) by the propulsion hydraulic motor via the hydraulic chuck 16, and the ground is excavated by the excavator bit 20. At the same time, the female screw member 18 is rotated and the propulsion cylinder 19 is contracted, and the hydraulic chuck 16 is propelled downward via the propulsion screw cylinder 17. At this time, even if the rotation or vibration of the propulsion rod 12 is transmitted to the connection portion 23, it is not loosened by the loosening stopper 11. That is, when the propulsion rod 12 is rotated in the right direction, the rod side nut member 32 and the joint side nut member 33 are respectively urged to be tightened, and the propulsion rod 12 is connected to the propulsion rod 12 via the loosening stopper 11. The swivel joint 22 is firmly fixed. Thereby, it can prevent beforehand that the connection part 23 remove | deviates and the swivel joint 22 falls, or the water for excavating earth and sand used according to soil quality and a hardening agent are ejected.
[0026]
According to the above embodiment, the rod-side nut member 32 and the joint-side nut member 33 are fitted to the connecting portion 23 of the main body 22a of the propulsion rod 12 and the swivel joint 22 by externally fitting the cylindrical main body 31 of the loosening stopper 11. Since each of them is tightened and the propulsion rod 12 and the swivel joint 22 are connected and fixed, they are fitted to the connecting portion 23 without modifying the propulsion rod 12 or the swivel joint 22 or adding or shaping parts. It is possible to surely prevent loosening by simply making it happen, and it is possible to reliably prevent an accident in which the connecting portion 23 comes off and the swivel joint 22 falls.
[0027]
In the above-described embodiment, each member of the loosening stopper 11 is formed with a locking surface such as a tool for licking from two opposing surfaces, but it can also be formed in a hexagonal cross section.
[0028]
Further, the taper portion 32c is formed in the female thread portion 32a of the rod side nut member 32, and the taper portion 33c is formed in the female thread portion 33a of the joint side nut member 33. The rod side male thread portion 31c of the cylindrical main body 31 and The joint-side male thread portion 31d may be provided with a tapered portion, or both may be provided with a tapered portion.
[0029]
【The invention's effect】
As described above, according to the first aspect of the present invention, the cylindrical body is externally fitted over the propulsion rod and the swivel joint to the threaded connection portion, and the rod side nut member and the joint side nut member are rotated and tightened. By reducing the diameters of the rod-side male threaded portion and the joint-side male threaded portion through the split, the propelling rod and the cylindrical main body are fixed to each other via the cylindrical main body. As a result, even if the propulsion rod is driven to rotate with vibration, the rod side nut member and the joint side nut member are each pivotally attached in the tightening direction, so that the connection state is further strengthened and the screw-type connection part is released. There is no fear.
[0030]
In addition, since the propulsion rod and the swivel joint do not require any shape change or expansion, it can be easily applied to the existing propulsion rod and swivel joint.
Furthermore, even if the connecting screw part is removed due to some mistake such as a tightening failure, the cylindrical body is fitted around the connecting screw part, so that the liquid injected from the swivel joint is not scattered around.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a connecting portion showing an embodiment of a loosening stopper for a drilling propulsion pipe according to the present invention and showing a use state.
FIG. 2 is a schematic front view of a boring machine using the loosening stopper.
FIG. 3 is an overall perspective view showing the loosening stopper.
FIGS. 4A to 4D show the same locking device, FIG. 4A is an overall plan view, FIG. 4B is an overall front view, FIG. 4C is an overall right side view, and FIG. FIG.
5A and 5B show a locking device, FIG. 5A is a cross-sectional view taken along the line AA shown in FIG. 4A, and FIG. 5B is a cross-sectional view taken along the line BB shown in FIG. FIG.
6A to 6D show a cylindrical main body of the locking device, FIG. 6A is a left side view, FIG. 6B is a front view, FIG. 6C is a right side view, and FIG. It is a rear view.
FIGS. 7A to 7D show a cylindrical main body of a loosening stop, FIG. 7A is a plan view, FIG. 7B is a bottom view, and FIG. (D) is DD sectional drawing shown to (a).
8A to 8E show rod side nut members of the locking device, FIG. 8A is a plan view, FIG. 8B is a front view, FIG. 8C is a right side view, and FIG. A bottom view and (e) are EE sectional views shown in (a).
FIGS. 9A to 9E show joint side nut members of the locking device, FIG. 9A is a plan view, FIG. 9B is a front view, FIG. 9C is a right side view, and FIG. A bottom view and (e) are FF sectional views shown in (a).
FIGS. 10A and 10B show a conventional locking device, FIG. 10A is a longitudinal sectional view, and FIG. 10B is an XX sectional view shown in FIG.
[Explanation of symbols]
11 Loosening Stopper 12 Propulsion Rod 13 Boring Machine 16 Hydraulic Chuck 17 Propulsion Screw Cylinder 19 Propulsion Cylinder 20 Excavation Bit 21 Connection Portion 22 Swivel Joint 22a Main Body 23 Connection Portion 31 Tubular Main Body 31a Large Diameter Portion 31b Locking Surface 31c Rod Side male threaded portion 31d Joint side male threaded portion 31e, 31f Slot 32 Rod side nut member 32a Female threaded portion 32b Locking surface 32c Tapered portion 33 Joint side nut member 33a Female threaded portion 33b Locking surface 33c Tapered portion

Claims (1)

A propulsion rod for excavation for preventing loosening of a screw-type connection part connecting a propulsion rod rotated by a boscilling machine and a swivel joint,
A cylindrical main body in which the large-diameter portion is formed loosely fitted to the connection portion, a rod-side nut member that is externally fitted to a rod-side male screw portion formed on the propulsion rod side of the large-diameter portion of the cylindrical main body, A joint-side nut member fitted on the joint-side male thread portion formed on the swivel joint side of the large-diameter portion;
A plurality of slits are formed in the axial direction in each of the rod side male thread part and the joint side male thread part,
Forming at least one of the female threaded portion of the rod-side nut member and the rod-side male threaded portion, and at least one of the female threaded portion of the joint-side nut member and the joint-side male threaded portion, and forming a tapered portion that can be reduced in diameter by tightening;
A slack stopper for a digging propulsion rod, wherein the rod side male thread portion and the joint side male thread portion are formed so as to be urged in a tightening direction when the propulsion rod is rotated forward.

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