JP3028386B2 - Excavator swivel anti-rotation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cast-in-place pile formed by using a drilling mechanism such as an earth auger to form a drilling hole in the ground and mixing cement milk or other coagulant into the soil of the drilling hole. In particular, the present invention relates to an apparatus for excavating a deep hole using a long rod, which prevents a swivel disposed at an upper end of the rod from rotating.

[0002]

2. Description of the Related Art When constructing a building, it is difficult to construct a cast-in-place pile by mixing a coagulant into the soil of the ground or the like, or to improve the ground in a columnar shape. It is used as a means for improving the strength of the ground when building or the like. When constructing the cast-in-place pile, drill a hole perpendicular to the ground with an earth drill or a similar drilling blade device, and mix a coagulant such as cement milk into the soil of the drilled hole. Then, a mechanism for constructing a cast-in-place pile or the like by using the mixture filled in the holes and solidified is used.

[0003] As a construction apparatus for constructing the cast-in-place pile, for example, an apparatus as disclosed in Japanese Patent Application Laid-Open No. 1-131716 is used. In the conventional device, a work vehicle equipped with a drilling device such as an earth drill,
It is used in combination with a device for injecting a coagulant such as cement milk. Then, after drilling a hole of a predetermined depth by a drilling device, a coagulant is supplied while pulling up the drilling blade, and is spouted from the tip of the drilling blade, and the excavated earth and sand and the coagulant are mixed, and cast in place. I'm trying to build a pile. In addition, a swivel is attached to the upper part of the rod, an injection hose is connected to the swivel, a coagulant sent from an injection pump is supplied to the rod, and the coagulant is ejected from a portion of the drilling blade through a hole passing through the center of the rod. Means to make it work.

[0004]

However, in an excavator as shown in the above-mentioned conventional example, an upper device for supporting and driving an upper portion of a rod is moved up and down along a guide column provided in a work vehicle. Therefore, a rod having a length corresponding to the height of the guide column is used. Therefore, since the depth of the ground that can be excavated by the excavator is limited by the length of the rod, there is a problem that a long cast-in-place pile cannot be constructed. Therefore, in order to construct a deep cast-in-place pile, an upper device, such as a boring device, provided with a drive mechanism for the middle part of the rod is placed, and the rod is raised according to the depth of the hole to be excavated. There has been proposed a device which can be continuously added to an excavator so that excavation can be continued.

As described above, in an excavator using a long rod, a rod is provided so as to protrude to an upper portion of the upper device, and an injection hose is connected to an upper end of the rod via a swivel, and a cement milk or the like is used. A mechanism for supplying a coagulant is configured. However, in a device in which the swivel is arranged in a free state on the upper part of the upper device, when the rod is rotated, the swivel corotates, and the injection hose connected to the swivel is entangled with the rod, so that the injection is performed. The problem that the hose is easily damaged occurs. If the injection hose is torn, a high-level coagulant supplied from the pump will be scattered around, causing a serious problem.

[0006] On the other hand, in the conventional working device, a worker holds the injection hose by hand and uses a means for preventing the injection hose from getting entangled with the rod in a state of applying a constant tension. I have. However, if the worker relaxes even a little, a state occurs in which the swivel is entangled with the rod due to the rotational force applied to the swivel. If a high-strength hose such as a high-pressure hose is used instead of a commonly used vinyl hose as the injection hose, the risk of damage to the injection hose can be reduced. However, entanglement of the injection hose with the rod affects the driving force on the rod, and is not always a good method.

[0007]

An object of the present invention is to prevent a swivel as described above from rotating together with a rod. A long cross member is attached to the swivel, and wires are connected to both ends of the cross member. It is an object of the present invention to provide a device that applies a constant tension to a wire and can prevent a swivel from rotating together with a rod.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a rod is disposed on a guide column supported by a work vehicle, a digging blade mechanism is disposed at a lower end of the rod, and the rod is vertically moved along the guide column. An upper device that moves and a lower device that is provided at a fixed position below the guide column arranges a holding and guiding mechanism for the rod, connects an injection hose to the upper portion of the rod via a swivel, and provides a ground improvement agent. And the like are supplied to a rod via a swivel, and are ejected from an excavation blade provided at a tip end portion of the rod into an excavation hole, mixed with soil or the like in the excavation hole, and perform soil improvement or the like.

In the present invention, a crossbar member is attached to a swivel disposed above the rod, a mechanism for applying tension by a wire from both ends of the crossbar member is disposed, and a mechanism for applying the tension is provided. A load applying mechanism is arranged for each of the two wires arranged in parallel, and a weight member is attached. Further, in the swivel rotation preventing device of the excavator of the present invention, a crossbar member is attached to a swivel disposed on the upper portion of the rod, and a mechanism for applying tension by a wire from both ends of the crossbar member is disposed, As a means for applying tension, a wire connected to both ends of the crosspiece member is connected to one wire in the middle thereof, and a drum device with a tension applying device is arranged for the one wire, With the application drum device, a mechanism for applying a constant value of tension to both sides of the crosspiece member can be configured.

As described above, the rod is driven by attaching the crosspiece member to the swivel and providing a mechanism for applying a constant tension to the wires connected to both ends of the crosspiece member. At this time, it is possible to prevent the swivel from rotating together and prevent the injection hose from getting entangled with the rod. In addition, the swivel rotation prevention device of the excavator of the present invention is configured such that a crossbar member of a predetermined length is attached to the swivel, and a mechanism for connecting a wire to the crossbar member to apply tension is arranged. Therefore, the structure is simple, and the performance of the excavator is not hindered. And the efficiency of the excavation work can be improved without forcing the worker to perform an extra work.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and 2
1 shows a side view in FIG. 1 and a state seen from the front in FIG. 2. A work vehicle 1 as a working device of the present invention includes a crawler 3 as a traveling member. Uses equipped vehicles. In the work vehicle, an engine 4 and a hydraulic pressure generating device 5 are provided on an upper portion of a main body frame 2 equipped with a traveling unit, and a mechanism for driving each working device and the traveling unit by hydraulic pressure is used. A support member 6 is disposed in front of the main body frame 2, and a lower portion of the support member 6 is supported on the main body frame 2 via a lower support member 7. By supporting the upper portion with a hydraulic cylinder mechanism 8, the column member 6 is provided so as to be tiltable about the lower support member 7.

A guide column 10 is attached to the support column member 6, and a hoisting motor 1 is mounted on the upper portion of the guide column 10.
1 and the upper device 12 can be moved up and down using the wire 19 by driving the hoist motor 11. Further, the upper device 12 constitutes a mechanism for driving the rod 20 that supports the excavating blade member 21, and fixes the lower portion of the guide column 10 to support the lower portion of the rod 20. Lower device 1 in position
5 are provided. In the upper device 12 and the lower device 15 as means for supporting and driving the rod 20, the upper device 12 includes a driving device 13 including a hydraulic motor and a gear device, and a chucking device 14 for gripping and driving the rod 20. And the lower device 15 is provided with chuck means and guide means for the rod.

A swivel 22 is provided on the upper part of the rod 20.
And an injection hose 25 is connected to the upper member 23 of the swivel 22 to supply a high-pressure coagulant sent from a pump 26 toward the rod. The pump 26
In contrast, a stirring tank 27 is arranged to mix a coagulant such as cement or water glass with water so that a liquid coagulant can be supplied toward the drilling hole. The injection hose 25
The coagulant supplied to the swivel 22 via the rod 20 is supplied to the through hole of the rod 20 from the upper member 23 held so as not to rotate, via the lower member 24 which rotates together with the rod 20. Then, it is ejected from the excavating blade 21 provided at the lower part of the rod 20 to be mixed with the excavated soil.

In the mechanism provided on the guide post 10 for holding and driving the rod, when the hole to be excavated is very deep, the rod 20 is disposed so as to protrude largely above the guide post 10. Is done. When a long rod is used as described above, the chucking means 14 and the chuck mechanism provided in the lower device 15 are alternately operated to lift the rod and push the drilling blade 21 into the drilling hole 29. You can do so. In the case where the excavation hole 29 is dug by using the excavation blade 21, the lower device 15 is operated so as to perform a guiding action on the rod 20.

After the upper device 12 has been lowered to the lower limit position, the rod 20 is fixedly held by the chuck mechanism provided in the lower device 15, another rod is added to the upper portion of the rod, and the swivel 22 is attached. , Upper device 1
2 is lifted and grasped again, and the rod 20 is driven so that the excavation work can be continued. Further, in the apparatus of the present invention, the hydraulic hose 1 is disposed between the hydraulic unit 5 and the hydraulic unit 5 to drive the upper device 12 and the hoist motor 11.
7 and 18 are connected, and a hydraulic drive mechanism can also be used for driving the cylinder 6 disposed on the support member 6 and the chuck mechanism.

In the apparatus of the present invention configured as described above, the upper member 23 of the swivel 22 disposed above the rod 20 is rotated in the excavation direction by the rotation of the lower member 24 provided integrally with the rod 20. There is a problem of doing. And, as described above as the conventional problem,
When the swivel 22 rotates, the injection hose 25 is rotated.
However, there is a problem that the injection hose composed of a vinyl hose or the like is damaged, which causes a problem that the injection hose is wound around the rod.

Therefore, in order to solve the above-described problem, in the present invention, a long cross member 30 is attached to the upper portion of the swivel 22 or an arbitrary position via the fixing portion 31. Then, wires 32 and 33 are arranged at both ends of the crosspiece member 30, and the wires 32 and 33 are
A mechanism for applying tension is provided. The mechanism for applying tension using the crossbar member is configured as shown in FIG. In the apparatus shown in FIG.
Bar member 3 attached to the upper part of the vehicle through a fixing portion 31
No. 0 connects the wires 32, 33 to both side ends thereof, and the load applying mechanisms 35, 35a are arranged for the respective wires.

The wires 32, 33 are suspended from the rear part of the vehicle body via guide pulleys 34, 34a disposed on the upper part of the rear part of the vehicle body, and are provided with load applying mechanisms 35, 3
A constant tension is applied by 5a. The load applying mechanism will be described with reference to a reference numeral 35. When the wire 32 is wound a plurality of times between an upper pulley 36 attached to a rear portion of a vehicle body and a lower pulley 37 provided with a weight 38, 38 allows tension to be applied to the wire. The other wire 33 is configured so that a predetermined tension can be applied to the other wire 33 by a load applying mechanism 35a provided with a weight 38a.

As described above, by using the crosspiece member 30 attached to the swivel 22 and applying a predetermined tension with a wire, the inconvenience that the swivel 22 rotates when the rod 20 is driven. This can be prevented from occurring. In the embodiment shown in FIG. 3, the tension applied to the wire is, for example, 3 to
With a value of about 5 kg, swivel rotation can be prevented. Therefore, the weights 38 and 38a can be relatively light.
Considering the weight of the pulley and the like, each component can be configured with a relatively lightweight one.

(Another embodiment of the present invention) In addition to the swivel rotation preventing device of the excavator shown in FIG. 3, in the present invention, as shown in FIG. And a mechanism for applying tension to the wire by using one tension applying means. In the example shown in FIG. 4, the wire 4 is attached to the cross member 30 attached to the upper part of the swivel 22.
0 and 41 are connected respectively. Further, the two wires are connected to one wire 43 via a connecting portion 42, and the wire 43 is connected to a tension applying drum device 46 via a guide pulley 45.

That is, the wire shown in FIG. 4 is formed in a substantially Y-shape, and tension is applied to the single wire 43 by the tension applying drum device 46. Accordingly, the same value of tension is applied to both end portions of the crosspiece member 30 to prevent the swivel from rotating along with the rod. As the tension applying drum device, a commercially available spring motor can be used, and by setting an arbitrary resistance value to the motor, it can follow the operation of moving the rod up and down. As a result, the operations of winding and feeding the wire can be performed.

By using the spring motor or the like, even when the swivel is moved up and down, it is possible to maintain a state in which a constant tension is applied to both end portions of the crosspiece member, and the swivel is connected to the rod. Following the rotation,
No co-rotation occurs. As described above, by arranging a wire in a substantially Y-shape with respect to the crosspiece member 30 and configuring a mechanism for applying the same value of tension to both sides of the crosspiece member 30, the rod can be moved in any direction. , The swivel can be prevented from rotating. That is, the wires 40 and 41 connected to the wire 43 via the coupling portion 42 are connected to the tension applying drum device 4.
6, a constant force is always applied, so that even if a rotational force is applied to one of the crosspiece members, the wire connected to the other cross member opposes the force applied to one of the wires, This will apply a force that pulls in the opposite direction.

Therefore, the swivel rotation preventing device of the excavator according to the present invention can prevent the swivel from rotating by using a relatively simple mechanism. This eliminates the need for the worker to engage in pulling the injection hose. Although the device shown in FIG. 3 has relatively poor appearance, it does not need to use a spring motor or the like, so that it can be configured at a very low cost. Further, when the mechanism as shown in FIG. 4 is configured, the action of applying tension to the wire can be satisfactorily exerted, and the force to be set on the tension applying drum device can be set as an arbitrary value. Can be made to accurately follow up and down movements.

The swivel rotation preventing device of the drilling device according to the present invention configured as described above is applicable not only to a cast-in-place pile drilling device but also to a boring device or the like in which the swivel protrudes greatly above the support member. It is also possible to apply. When the length of the rod protruding upward is relatively short, a device as shown in FIG. 3 can be used. When the length of the vertical movement of the rod is relatively long, As shown in FIG. 4, an apparatus using a spring motor or the like can be applied. Further, since the tension applying drum device as shown in FIG. 4 can set the wire feeding length arbitrarily, besides disposing it at the rear of the work vehicle, It is also possible to use by attaching to any member.

[0025]

As described above, the swivel rotation preventing device for an excavator according to the present invention attaches a crosspiece to a swivel and applies a constant tension to a wire connected to both ends of the crosspiece. By configuring the mechanism to give
When the rod is driven, it is possible to prevent the swivel from rotating co-rotating, and to prevent the injection hose from becoming entangled with the rod. In addition, the swivel rotation prevention device of the excavator of the present invention is configured such that a crossbar member of a predetermined length is attached to the swivel, and a mechanism for connecting a wire to the crossbar member to apply tension is arranged. Because
The structure is simple and does not impair the performance of the excavator. Then, the efficiency of excavation work such as cast-in-place piles can be improved without forcing the worker to perform extra work.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a working device of the present invention.

FIG. 2 is a front view of the working device.

FIG. 3 is an explanatory view of a swivel rotation preventing device of the excavator according to the present invention.

FIG. 4 is an explanatory view of another embodiment of the swivel rotation preventing device of the excavator according to the present invention.

[Explanation of symbols]

Reference Signs List 1 work vehicle, 6 support members, 10 guide pillars, 12 upper device, 15 lower device, 20
Rod, 21 drilling blade, 22 swivel, 25
Injection hose, 29 borehole, 30 crosspiece, 32, 33 wire, 38 weight, 4
0.41 wire, 46 tensioning drum device.

Claims (2)

(57) [Claims] 1. A rod is disposed on a guide column supported by a work vehicle, an excavating blade mechanism is disposed at a lower end of the rod, an upper device that moves up and down along the guide column, and a lower portion of the guide column. With the lower device provided at the fixed position, a holding and guiding mechanism for the rod is arranged, an injection hose is connected to the upper part of the rod via a swivel, and a ground improvement agent or the like is supplied to the rod via the swivel. In a device for performing ground improvement, etc., by ejecting from a drilling blade provided at the tip of a rod into a drilling hole, mixing with soil in the drilling hole, etc., attaching a crosspiece member to a swivel arranged above the rod A mechanism for applying a tension by a wire from both ends of the crosspiece member; and a mechanism for applying the tension, wherein a load applying mechanism is arranged for each of two parallel wires. Swivel anti-rotation device of the drilling apparatus characterized by attaching a weight member. 2. A cross bar member is attached to a swivel disposed above the rod, and a mechanism for applying tension by a wire from both ends of the cross bar member is disposed.
As means for applying the tension, wires connected to both ends of the crosspiece member are connected to one wire in the middle thereof,
A tension device provided with a tension applying mechanism for winding the one wire, wherein a constant value of tension is applied to both side portions of the crosspiece member by the tension set in the tension applying drum device. The swivel rotation prevention device for an excavator according to claim 1, wherein