JP6144144B2 - Ground improvement machine - Google Patents

Description

  The present invention relates to a ground improvement machine, and more particularly to a ground improvement machine that injects a ground improvement agent into a hole excavated from a swivel joint through a screw shaft.

  The ground improvement machine rotates a hollow screw shaft with a screw drive device that can be moved up and down along the leader, performs excavation work with a drilling tool at the lower end of the screw shaft, and is pumped from a batcher plant via an injection hose. The ground improvement agent is injected into the screw shaft from the swivel joint provided at the upper end of the screw shaft, stirred while injecting the ground improvement agent into the hole excavated from the tip of the drilling tool, and the ground improvement agent is cured to We are making improvements.

  In this kind of ground improvement machine, in order to prevent the swivel joint from swirling around due to the rotation of the screw shaft during work, a plurality of pipes with different diameters are slidably connected so that they can expand and contract. A telescopic detent member is used, and the outermost large-diameter pipe is fixed to the screw drive, and one end of the arm is fixed to the upper end of the innermost small-diameter pipe, and the swivel joint is held by this arm. ing. Each of the pipes of the anti-rotation member having such a telescopic structure is provided with a lock pin insertion hole at a position where it overlaps when contracted, and the lock pin is inserted so that it does not extend accidentally during transportation or the like (for example, , See Patent Document 1).

JP 2009-203659 A

  However, as described in Patent Document 1, when the anti-rotation member is stopped by the lock pin, not only is the workability that the lock pin has to be removed during work, but the lock pin is erroneously inserted during work. However, there is a possibility that the lock pin may be bent by extending the anti-rotation member, or the lock pin removed during the work may be lost.

  Therefore, the present invention can prevent stretching during transportation with a simple structure even when a telescopic structure detent member is used to prevent swiveling of the swivel joint during operation. It aims at providing the ground improvement machine which can aim at the improvement of workability and workability.

  In order to achieve the above object, the ground improvement machine of the present invention is provided with a screw drive device for rotating the screw shaft on the leader standing on the work machine so that the screw shaft can be moved up and down, and the ground improvement agent is injected into the upper end of the screw shaft. In the ground improvement machine in which a hose is connected via a swivel joint, the expansion rod provided in the screw drive device, and a connecting member that connects the expansion rod and the swivel joint, the expansion rod has a diameter A plurality of pipes of different diameters are coaxially slidably connected so as to be stretchable, and the outermost large-diameter pipe is fixed to the screw driving device, and the same as the large-diameter pipe at the upper end of the innermost small-diameter pipe A large-diameter portion having an outer diameter is provided, and a flange member larger than the outer diameter of the large-diameter portion is provided on the upper portion of the large-diameter portion. Inserted into an insertion hole having an inner diameter that is larger than the outer diameter of the large-diameter portion provided in the member and smaller than the outer diameter of the flange member, and the upper surface of the flange member is in contact with the connecting member Therefore, the stretch preventing member that prevents the telescopic rod from extending upward is erected so as to straddle the insertion hole.

  Further, the stretch preventing member is preferably formed by bending a single bar material into a U shape, or formed by combining plate members into a U shape. More preferably, a buffer plate is provided between the members.

  According to the ground improvement machine of the present invention, the stretch preventing member is erected so as to straddle the insertion hole into which the telescopic rod is inserted, and the stretch preventing member and the upper surface of the eaves member are in contact with each other. Since it is performed reliably and the stretch-preventing member is almost the same height as the swivel joint, it does not affect the height restriction during operation. Further, since the stretch preventing member can be formed with a simple structure such as bending a single bar or combining plate members in a U-shape, it is easy to manufacture. In addition, by providing a buffer plate between the stretch-preventing member and the eaves member, there is no problem that the telescopic rod and the stretch-preventing member are damaged even during long-time transportation, etc. If only the buffer plate is replaced if necessary Good.

It is a side view which shows the 1st form example of the ground improvement machine of this invention. It is also a front view. It is a front view of the principal part which similarly shows the state which the expansion-contraction rod extended. It is a front view of the principal part which similarly shows the state which the expansion-contraction rod shortened. It is a sectional view of a telescopic rod and an extension stop member similarly. It is a top view of the principal part similarly. It is sectional drawing of the expansion-contraction rod and expansion | extension stop member of the ground improvement machine which shows the 2nd example of this invention.

  1 to 6 show a first embodiment of the present invention. A ground improvement machine 1 includes a base machine 3 that is turnably provided on a traveling unit 2 and a front part of the base machine 3. A leader 4 provided so as to be able to undulate, a backstay 5 that supports the leader 4 from the rear, a screw drive device 6 provided so as to be movable up and down on the leader 4, and a screw guide 7 provided at the lower end of the leader 4. A swivel joint 10 for injecting a ground improver pumped from a batcher plant (not shown) into the screw shaft 9 from the injection hose 8, and a telescopic rod 11 serving as a detent member for preventing the swivel joint 10 from rotating. And.

  Further, at the upper end of the screw shaft 9, a connecting member 12 for connecting the telescopic rod 11 and the swivel joint 10 and a hose holding member 13 for holding the introduction portion of the injection hose 8 to the swivel joint are V-shaped in a plan view. Are integrally formed.

  The screw shaft 9 is longer than the leader 4 and has a pipe-like shape having an injection hole for a ground improvement agent in the inner axial direction. The lower end is provided with an excavating tool 9a and an agitating tool 9b. Square shaft portions 9 c and 9 d that engage with the screw driving device 6 are provided at the center portion and the upper end portion, respectively.

  The telescopic rod 11 is formed in a telescopic structure in which three pipes 11a, 11b, and 11c having different diameters are connected so as to be slidable on the same axis and can be expanded and contracted upward along the screw shaft 9. The lower part of the outermost large-diameter pipe 11a is fixed to the side surface of the screw drive device 6 via a bracket 6a. A flange member 15 having a diameter larger than the outer diameter of the large diameter portion 14 is integrally formed at the upper end of the large diameter portion 14 having the same outer diameter as the large diameter pipe 11a. The small diameter pipe 11c is fixed to the upper end by a bolt 16.

  The connecting member 12 has an insertion hole 17 having an inner diameter through which the large-diameter pipe 11 a and the large-diameter portion 14 of the telescopic rod 11 can be inserted, and an extension preventing member 18 stands up across the insertion hole 17. The stretch rod member 18 prevents the telescopic rod 11 from coming out upward. On the upper portion of the flange member 15, a buffer plate 21 is provided by a bolt 22 for reducing the impact when the flange member 15 and the stretch preventing member 18 come into contact with each other.

  The stretch preventing member 18 is formed by bending a single bar having male screw portions at both ends into a U shape, and the both ends are inserted into the stretch preventing member insertion holes 19, 19 of the connecting member 12. It is fixed by fastening nuts 20 and 20 to the male screw part.

  In addition, guide surfaces 17a and 17b each having a conical surface whose opening end side is widened are provided on the inner peripheral surface of the upper and lower opening ends of the insertion hole 17, and the upper end outer peripheral surface and the large diameter portion of the large diameter pipe 11a. 14 is provided with guide surfaces 11d and 14a each having a conical surface having a small diameter at the tip end.

  The movement of the telescopic rod 11 and the connecting member 12 will be described based on the procedure for performing ground improvement using the screw shaft 9 longer than the leader 4 by the ground improvement machine 1 formed as described above. First, before starting the work, as shown in FIGS. 1 and 2, the screw driving device 6 is arranged at the upper end of the reader 4, and the angular shaft portion 9 c of the intermediate portion of the screw shaft 9 is engaged with the screw driving device 6. The upper part of the screw shaft 9 protrudes greatly above the screw driving device 6, and the excavator 9a at the lower end is raised from the ground.

  At this time, the connecting member 12 is raised according to the height of the swivel joint 10 connected to the upper end of the screw shaft 9, and the telescopic rod 11 is also extended to the maximum. Further, the telescopic rod 11 has a force acting in the direction of shortening due to its own weight of the middle and upper pipes 11b and 11c, but as shown in FIG. 3, the periphery of the upper opening of the insertion hole 17 of the connecting member 12 is The stretched state is maintained by being in contact with the lower surface of the flange member 15.

  In this state, the screw driving device 6 is operated to rotationally drive the screw shaft 9, and the screw driving device 6 is lowered along the leader 4, and at the same time, ground from the injection hose 8 into the screw shaft 9 through the swivel joint 10. Inject improver. At this time, since the telescopic rod 11 descends together with the screw driving device 6 and the screw shaft 9, the stretched rod 11 remains in an expanded state.

  After lowering the screw driving device 6 to the lower end of the reader 4, the screw driving device 6 and the injection of the ground improver are stopped, the engagement state between the angular shaft portion 9 c and the screw driving device 6 is released, and the screw shaft 9 The screw drive device 6 is raised to a position where it engages with the angular shaft portion 9d at the upper end of the screw. Since the screw drive device 6 rises in a state where the engagement state with the screw shaft 9 is released, the protrusion amount of the screw shaft 9 decreases with the rise of the screw drive device 6, and the screw drive device 6 and the swivel joint 10. The distance between and becomes gradually shorter.

  Along with this, the telescopic rod 11 is contracted, and the middle and upper pipes 11b and 11c are both housed in the large diameter pipe 11a, and the lower end of the large diameter portion 14 provided at the upper end of the small diameter pipe 11c is By contacting the upper end of the large-diameter pipe 11a, the telescopic rod 11 is in the most shortened state as shown in FIG.

  Further, in order to set the transportation state, the lower side of the screw shaft 9 is removed, the backstay 5 is shortened, and the leader 4 is tilted sideways. At that time, the screw drive device 6 is provided in the reader 4 while maintaining the shortened state of the telescopic rod 11 as shown in FIG. By adopting such a configuration, even if the small diameter pipe 11c of the telescopic rod 11 is extended upward during transportation, the buffer plate provided on the expansion preventing member and the flange member abuts, so that it does not extend further. Safe transport is possible.

  FIG. 7 shows a second embodiment of the present invention. Components that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The stretch preventing member 30 according to the present embodiment is formed by a pair of side plates 31, 31 erected so as to face the periphery of the insertion hole 17, and a ceiling plate 32 provided so as to connect both side plates. . The buffer plate 33 is fixed to the lower surface of the ceiling plate 32 with bolts 34. By forming in this way, it is not necessary to provide the connecting member 12 with a hole as long as the extension preventing member insertion hole, and it is sufficient to provide a bolt hole for fixing the side plate 31. Further, since the buffer plate is provided on the ceiling plate 32, when an existing telescopic rod is used, it is not necessary to process the telescopic rod.

  The holding position of the swivel joint 10 in the connecting member 12 can be set to an appropriate position as long as it can be prevented from being swung. Further, the connecting member 12 and the hose holding member 13 are integrated in a V shape in plan view. However, if the injection hose 8 can be held as the connecting member 12 moves up and down, the position and shape can be arbitrarily set. Can be set to

  DESCRIPTION OF SYMBOLS 1 ... Ground improvement machine, 2 ... Running part, 3 ... Base machine, 4 ... Leader, 5 ... Back stay, 6 ... Screw drive device, 6a ... Bracket, 7 ... Screw guide, 8 ... Injection hose, 9 ... Screw shaft, 9a ... excavator, 9b ... stirrer, 9c, 9d ... square shaft part, 10 ... swivel joint, 11 ... telescopic rod, 11a, 11b, 11c ... pipe, 12 ... connecting member, 13 ... hose holding member, 14 ... large Diameter part, 15 ... 鍔 member, 16 ... bolt, 17 ... insertion hole, 18 ... extension preventing member, 19 ... extension prevention member insertion hole, 20 ... nut, 21 ... buffer plate, 22 ... bolt, 30 ... extension prevention member, 31 ... side plate, 32 ... ceiling plate, 33 ... buffer plate, 34 ... bolt

Claims (4)

In a ground improvement machine in which a screw drive device that rotationally drives a screw shaft is provided on a leader standing on a work machine so that the screw shaft can be moved up and down, and an injection hose of a ground improvement agent is connected to the upper end of the screw shaft via a swivel joint.
A telescopic rod provided in the screw driving device;
A connecting member for connecting the telescopic rod and the swivel joint;
The telescopic rod is formed to be extendable by coaxially slidably connecting a plurality of pipes having different diameters, and the outermost large-diameter pipe is fixed to the screw drive device, and is attached to the upper end of the innermost small-diameter pipe. A large-diameter portion having the same outer diameter as the large-diameter pipe is provided, and an upper portion of the large-diameter portion is provided with a flange member larger than the outer diameter of the large-diameter portion,
The telescopic rod is inserted through an insertion hole having an inner diameter that is larger than the outer diameter of the large-diameter portion provided in the connecting member and smaller than the outer diameter of the flange member,
A ground improvement characterized in that an extension stop member that prevents the extension rod from extending to the upper side when the upper surface of the flange member comes into contact with the connecting member is erected so as to straddle the insertion hole. Machine. 2. The ground improvement machine according to claim 1, wherein the anti-elongation member is formed by bending a single bar material into a U-shape. 2. The ground improvement machine according to claim 1, wherein the stretch preventing member is formed by combining plate members in a U-shape. The ground improvement machine according to any one of claims 1 to 3, wherein a buffer plate is provided between the stretch preventing member and the flange member.

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