JPH0649614Y2 - Pile building equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a device for forming a pile of sand, crushed stone, quick lime, etc. in a soft ground to improve the soft ground. A pile composed of a rotating casing that is hanged down from the lower part of a machine frame that is suspended and supported so as to be rotatable, and a fixed casing that is inserted into the rotating casing and has a pile material feeding hopper provided at the upper end portion. Relating to creation equipment.

(Prior art and its problems) In this type of pile forming device, after the rotary casing and the fixed casing are penetrated into the ground to a certain depth, pile material such as sand, crushed stone or quick lime is put into the fixed casing from the hopper. And, while pulling out both casings, the pile material is discharged from the lower end of the fixed casing and left in the ground to form a pile, so that when the both casings penetrate, the earth and sand in the ground do not enter the fixed casing. It is necessary to provide a lid at the lower end of the casing so that it can be closed when the casing is inserted and opened when the casing is pulled out.

Then, in the conventional pipe forming device, such a lid was attached to the lower end of the rotating casing, but when the casing penetrates, this lid receives the resistance of the ground properly, which makes the penetration operation difficult. In particular, when a hard ground layer was encountered, it was necessary to raise the casing to the ground to suspend the penetration work and partially excavate using an earth auger, etc., and the work efficiency was very poor.

The present invention is intended to solve the problems of the conventional device.

(Means for Solving the Problems) In the pile forming device of the present invention, a rotary casing rotatably movably connected to the lower portion of the machine frame suspended by the leader and inserted in the rotary casing. In a pile forming device consisting of a fixed casing with a pile material charging hopper provided at the upper end, a drill bit is fixed to the lower end of the rotating casing, and a lid plate can be opened and closed at the lower end of the fixed casing. It is characterized by being pivotally attached.

(Example) An example in which the present invention is applied to an apparatus used in a quicklime pile method will be described below with reference to the drawings.

FIG. 1 shows the entire pile forming apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes a machine frame suspended from a leader (not shown) vertically installed on a crawler crane or the like,
A cylindrical rotary casing 3 having a screw 2 on its outer peripheral surface is rotatably hung in a lower portion of the machine frame 1 in a continuous manner.
The rotating casing 3 is rotationally driven by a pair of electric motors 4, 4 arranged on the machine frame 1. Reference numeral 5 denotes a cylindrical fixed casing that is concentrically inserted into the rotary casing 3, and has an upper end side fixed to the machine frame 1. Reference numeral 6 denotes a hopper for charging a pile material, which is arranged at an upper end portion of a fixed pipe 7 which is continuously provided on an upper portion of the fixed casing 5.

A large number of holes 8 for earth removal are formed in the rotary casing 3, and one excavating bit 9 and two auxiliary claws 10, 10 are circumferentially provided at the lower end of the rotary casing 3. They are fixed to each other with an interval of about 120 °. As is apparent from FIGS. 2 and 3, the excavating bit 9 is attached so that the blade portion 9a thereof has a sufficient protrusion inward from the inner peripheral surface of the rotary casing 3. Incidentally, the auxiliary nail 10
Has a function of further crushing the earth and sand excavated by the excavating bit 9, and also serves as a balance weight that balances with the excavating bit 9.

A lid plate 11 is pivotally attached to the lower end of the fixed casing 5 so as to be openable and closable. The lid plate 11 is larger than the diameter of the fixed casing 5 and is a partially cut-out circular plate whose one end is cut out in an arc shape. On the other hand, an arcuate fixing plate 12 having a shape corresponding to the arcuate cutout portion of the lid plate 11 is fixed to the lower end opening surface of the fixed casing 5 so as to close one end of the lower end opening surface, and this arcuate fixing At the base end portions of the fixed casing side hinge arms 13 and 13 fixed to the fixed casing 5 with the plate 12 inserted therethrough, the lid plate side hinge arms 14 and 14 are attached.
The base end portion of is covered by a pin 15 and the lid plate 11 is secured to the hinge arms 14 and 14 on the lid plate side with screws 16. An elastic seal packing 17 of the same shape is formed on the upper surface of the lid plate 11.
The seal packing 17 is screwed together with the holding plate 18.
It is fixed to the lid plate 11 by 16. Therefore, the lid plate
When 11 is in the closed position as shown by the solid line in FIG. 4, the elastic seal packing 17 on the upper surface of the lid plate 11 should be in close contact with the peripheral edge of the lower end opening of the fixed casing 5 to seal the lower end opening in a watertight manner. You can

Further, the lid plate 11 is automatically opened / closed via a wire 20 by driving an air cylinder 19. That is, as illustrated in FIG. 1 and FIG. 4, the air cylinder 19 is attached to the lower end of the machine frame 1 in an inverted state,
One end of the wire 20 inserted into the fixed casing 5 is fixed to the hook 21 provided on the lid plate 11, and the other end is pulled out from the upper portion of the fixed casing 5 to remove the sheave on the machine frame side.
It is fixed to a required part of the machine frame through a sheave 22b on the tip side of the piston rod 22a. Therefore, when the piston rod of the air cylinder 19 is extended as shown in FIG.
11 is closed, and the lid plate 11 pivots downward and opens with the piston rod contracted.

When forming a quicklime pile using the pile forming device having the above-described structure, first, the machine frame 1 of this device is suspended and supported at an appropriate height from the top of the leader by a lifting operation wire (not shown). In this state, while rotating the rotating casing 3 forward, the wire for raising and lowering operation is fed out,
The rotary casing 3 and the fixed casing 5 penetrate into the ground. At this time, the cover plate 11 at the lower end of the fixed casing 5 is held in the closed position as shown by the solid line in FIG. Then, when the rotating casing 3 penetrates into the ground, even if a hard ground layer is encountered, the excavating bit 9 at the tip of the rotating casing 3 can excavate, so that the penetrating operation can be performed quickly. it can.

In this case, the blade portion 9a of the excavating bit 9 has the rotating casing 3
Since it overhangs inward from the inner peripheral surface of
The ground will be excavated not only in the peripheral portion of the rotating casing 3 but also in the inner portion surrounded by the rotating casing 3, and therefore the rotating casing 3 with the lid plate 11 closed.
At the same time, the ground resistance applied to the tip portion of the fixed casing 5 that is descending in a stationary state, that is, the lid plate 11 is reduced, and thus the penetration operation is further facilitated. The earth and sand excavated during the penetration of the casing is discharged to the ground side by the screw 2 of the rotating casing 3, and the excavated earth and sand that has entered between the rotating casing 3 and the fixed casing 5 is an earth discharging hole of the rotating casing 3. It is discharged from the portion 8 and discharged upward by the screw 2. Further, during the penetration of the casing, the lower end opening of the fixed casing 5 is closed in a watertight sealed state by the lid plate 11 with the seal packing 17, so that water in the ground does not enter the fixed casing 5. .

When the rotary casing 3 is penetrated to a predetermined depth in the ground as described above, the raising and lowering operation wire is stopped, the air cylinder 19 is contracted to open the lid plate 11, and the rotary casing 3 is stopped. In the state in which the lime is allowed to rotate or is rotated as it is, quick lime is put into the fixed casing 5 from the hopper 6 through the fixed tube 7. After the addition of the quicklime, the rotary casing 3 is started to be pulled out while rotating the rotating casing 3 in the opposite direction or the same direction as when the penetration is performed while winding the lifting operation wire. As the rotating casing 3 is pulled out in this way, the slaked lime in the fixed casing 5 is discharged from the opened lower end opening into the excavation hole in the ground, and this quick lime reacts with water in the ground to form a slaked lime pile in the ground. It will be created.

In this embodiment, the slaked lime charged in the fixed casing 5 is discharged from the lower end of the fixed casing 5 when the casing is pulled out as it is, but the inner rod is arranged in the fixed casing 5 so as to be vertically movable with a predetermined stroke. In addition, if the slaked lime in the fixed casing 5 is discharged from the lower end of the fixed casing 5 while being compacted by the vertical movement of the inner rod when the casing is pulled out, a stronger slaked lime pile can be formed. In this case, it is more effective to attach a vibro flot to the lower end of the inner rod.

(Effect of the Invention) According to the present invention, the excavating bit is fixed to the lower end of the rotary casing, and the lid plate is pivotably attached to the lower end of the fixed casing inserted into the rotary casing so as to be openable and closable. When the casing penetrates, the ground can be excavated by the excavating bit at the lower end of the rotating casing, so that even in the case of hard ground, the excavation can be performed, and the casing penetrating operation can be performed easily and quickly. By the cover plate of the above, it is possible to prevent the intrusion of earth and sand into the fixed casing.

Further, the lid plate is formed to have a diameter larger than that of the lower end opening of the fixed casing, and a seal packing for water-tightly sealing the lower end opening at the time of closing is attached to the upper surface thereof, particularly when the casing penetrates in the formation of quicklime pile. It is possible to prevent the ingress of water into the fixed casing, so that the quick lime injected into the fixed casing reacts with water and solidifies before the casing is withdrawn and it roots in the ground and makes it difficult to pull out the casing Such an inconvenient situation can be avoided.

[Brief description of drawings]

1 is an overall side view of a pile forming apparatus showing an embodiment of the present invention, FIG. 2 is a bottom view of a casing portion in the same apparatus, FIG. 3 is a perspective view showing a lower end portion of a rotary casing, and FIG. FIG. 5 is an enlarged vertical sectional view showing the lower end portion of the fixed casing, and FIG. 5 is a sectional view taken along the line VV of FIG. 1 ... Machine frame, 3 ... Rotating casing, 5 ... Fixed casing,
6 ... Hopper, 8 ... Hole for earth removal, 9 ... Bit for excavation,
11 ... Lid plate, 13, 14 ... Hinge arm, 15 ... Pin, 17 ... Elastic seal packing.

Claims (2)

[Scope of utility model registration request] 1. A stationary casing having a machine casing suspended from a leader and rotatably connected to the lower portion of the machine casing, and a pile material feeding hopper provided at the upper end of the casing. A pile forming apparatus including a casing, wherein a drill bit is fixed to a lower end of a rotating casing, and a lid plate is pivotably attached to the lower end of a fixed casing so as to be openable and closable. 2. The lid plate is formed to have a diameter larger than that of the lower end opening of the fixed casing, and a seal packing for watertightly sealing the lower end opening when closed is attached to the upper surface of the lid plate. Pile creation device.