JPH0714420Y2 - 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, or the like in a soft ground to improve the soft ground. The present invention relates to a pile forming device that includes a casing that is provided so as to hang down from a lower portion of a machine frame that is supported, and a hopper that is provided at an upper portion of the casing for charging a pile material.

(Prior art) In this type of pile forming device, after the casing is penetrated into the ground to a certain depth, pile materials such as sand and crushed stone are put into the casing from the hopper, and the casing lower end is pulled out while pulling out the casing. Since the pile material is discharged while remaining in the ground while creating piles, the bottom end of the casing is closed and pulled out when the casing penetrates so that the soil in the ground does not enter the casing when the casing penetrates. It is necessary to provide a bottom lid (shoe) that can be opened from time to time.

Therefore, the bottom lid provided at the lower end of the casing of the conventional device is composed of a pair of curved half halves, which are obtained by dividing a hollow substantially inverted cone into two. The upper end of the pair of half halves is the casing lower end. When the casing is suspended above the ground, the two halves are spaced apart from each other and remain open. Therefore, when the casing penetrates into the ground, the two halves are manually pressed on the ground from both sides to be closed, and thus the two halves are held in the closed state by hand, and The casing is lowered until the lower end bites into the ground surface so that both halves cannot be opened, and then the original casing penetration operation is started.

(Problems to be solved by the invention) As described above, conventionally, prior to the penetration of the casing,
Since the pair of half halves that form the bottom lid must be pressed and held in the closed state by hand, extra manual work is required, which lowers the pile forming work efficiency.

The problem to be solved by the present invention is to allow the bottom lid to be automatically closed when the casing is penetrated.

(Means for Solving the Problems) The present invention is a pile including a casing that is hung and connected continuously to a lower portion of a machine frame that is suspended from a leader, and a hopper that is provided at an upper portion of the casing and is used for charging pile material. In the forming apparatus, the casing includes a rotating casing 3 and a fixed casing 5.
And a pair of half-divided plates 12, 1 forming a bottom lid 11 having a diameter larger than that of the fixed casing 5 at the lower end of the fixed casing 5.
3 is a horizontal closed position that closes the lower end opening of the fixed casing 5 around a pivot 14 arranged along the half-dividing line, and an opening in which the half-divided plates 12 and 13 open to that position at an acute angle. It is characterized in that the excavating bit 9 is pivotally attached so as to rotate between the position and the lower end portion of the rotating casing 3 so as to project inward.

Embodiment An embodiment of the present invention 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 excavation pit 9 and two auxiliary claws 10, 10 are circumferentially formed at the lower end of the rotary casing 3. They are fixed to each other with an interval of about 120 °. The digging bit 9 is mounted so that the blade portion 9a thereof has a sufficient protrusion inward from the inner peripheral surface of the rotary casing 3, as is apparent from FIGS. The auxiliary claw 10 has a function of further crushing the earth and sand excavated by the excavation bit 9, and also functions as a balance weight that balances with the excavation bit 9.

A bottom lid 11 is provided at the lower end of the fixed casing 5 so as to be openable and closable. As shown in FIGS. 2 to 4, the bottom cover 11 is a circular plate having a diameter larger than that of the fixed casing 5.
It is composed of a pair of half-circle shaped half-divided plates 12, 13 that are divided, and the short pipe portions 12a, 12b, 13a, on the respective side edges along the half-divided lines of these half-divided plates 12, 13. 13b are fixed to each other at a required interval, and the short tube portion 12 of one half-split plate 12
a, 12b and the short tube portions 13a, 13b of the other half-split plate 13 are combined so as to be adjacent to each other in the axial direction, and these short tube portions 12a
The pivot 14 is inserted into the shafts 13 to 13b so as to be relatively rotatable.
The central part of the axial direction is a large diameter shaft part with the same diameter as each short pipe part 12a-13b.
14a is formed, and this large-diameter shaft portion 14a is formed on one half plate 12
Is interposed between the short tube portion 12b and the short tube portion 13a of the other half-split plate 13, and both ends of the pivot 14 are attached to a pair of brackets 15 and 15 fixed to both end portions in the diametrical direction of the fixed casing 5. On the other hand, it is non-rotatably attached and fixed, and the large diameter shaft part
A short cylindrical stopper piece 16 for integrally restricting the opening angular position of the half-split plates 12 and 13 is integrally provided on the lower side surface of 14a in a state where the large diameter shaft is fixed to the bracket 15. I am allowed. Therefore, the two half-divided plates 12, 13 close the lower end opening of the fixed casing 5 in the horizontal position as shown by the alternate long and short dash line in FIG. 3, and move downward from the horizontal closed position about the pivot 14 by its own weight. It rotates to open the lower end opening to the maximum at the position shown by the solid line in the figure,
The open position is limited by the stopper piece 16 to an inclined position opened at an acute angle of, for example, 70 ° to 80 ° with respect to the horizontal closed position. And, in the state where the fixed casing 5 is pulled up to the ground and suspended, both half-divided plates 12 and 13 are in the open position inclined in a substantially C shape as shown by the solid line in FIG.
When the fixed casing 5 penetrates into the ground, both halves 12,1
3 is pushed up by the earth pressure of the ground applied to the lower surface of these, and is rotated about a pivot 14 to a horizontal closed position, and is always held at this horizontal closed position while penetrating the ground. Further, since the earth pressure is not applied when the fixed casing 5 is pulled out from the ground, the two half plates 12 and 13 are rotated downward by their own weight to take the above-mentioned open position.

Next, a process of forming a sand (sand) pile or a gravel (crushed stone) pile using the pile forming apparatus having the above-described configuration will be described. First, the machine frame 1 of the present apparatus will be described.
Is suspended and supported at an appropriate height from the top of the reader by an elevating operation wire (not shown), the elevating operation wire is fed while rotating the rotating casing 3 in the forward direction, and the rotating casing 3 is fixed together with the fixed casing 5. It penetrates into the ground. The bottom lid 11 at the lower end of the fixed casing 5 is in the open position until the casings 3 and 5 penetrate into the ground, but when the fixed casing 5 is inserted into the ground, both half-divided plates 12 and 13 are pushed up. Will be blocked and
During the penetration of the casing, it is held in the horizontal closed position as shown by the one-dot chain line in FIG. In this way, when the rotating casing 3 penetrates into the ground, 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. Further, in this case, since the blade portion 9a of the excavating bit 9 is sufficiently overhanged inward from the inner peripheral surface of the rotary casing 3, the ground is not limited to the peripheral portion of the rotary casing 3 and the rotary casing 3. Therefore, the ground resistance applied to the tip of the fixed casing 5, that is, the bottom cover 11 that is descending in a stationary state together with the rotating casing 3 with the bottom cover 11 closed is reduced. This makes the penetration operation even easier. 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.

When the rotary casing 3 is penetrated to a predetermined depth in the ground as described above, the feeding of the lifting operation wire is stopped, and the rotary casing 3 is stopped or rotated as it is, and sand or crushed stones are removed from the hopper 6. Quicklime is put into the fixed casing 5 through the fixed pipe 7. After this sand or crushed stone is thrown, while pulling up and down the wire for raising and lowering, rotating the rotating casing 3 in the opposite direction or in the same direction as when it was penetrated, when the pulling out of the rotating casing 3 and the fixed casing 5 is started, The bottom lid 11, which was held in the horizontal closed position by the earth pressure, does not apply earth pressure to the lower surfaces of the two half-divided plates 12 and 13 when the fixed casing 5 is pulled up, so that the bottom lid 11 rotates downward by its own weight and moves to the third position.
The state shown by the solid line in the figure is obtained. Further, as the rotary casing 3 and the fixed casing 5 are pulled out in this way, the sand or crushed stone in the fixed casing 5 is discharged from the opened lower end opening into the excavation hole in the ground, and the sand pile or gravel is ground in the ground. The pile will be created.

Further, in this embodiment, the sand or crushed stone put into the fixed casing 5 is discharged from the lower end of the fixed casing 5 when the casing is pulled out as it is.
The inner rod is arranged in the fixed casing 5 so as to be vertically movable with a predetermined stroke, and when the casing is pulled out, the slaked lime in the fixed casing 5 is ejected from the lower end of the fixed casing 5 while being compacted by the vertical movement of the inner rod. If it is, a stronger sand pile or gravel pile can be formed. In this case, it is more effective to attach a vibro flot to the lower end of the inner rod.

(Operation and Effect of the Invention) The present invention has a pair of half plates, which form a bottom cover having a diameter larger than the casing, at the lower end of the fixed casing, with a pivot axis arranged along the half lines as the center. The bottom cover is pivotally attached so as to rotate between a horizontal closing position that closes the lower end opening of the casing and an open position where each half-divided plate is opened at an acute angle with respect to the position. When the casing is pulled up to the ground and suspended, the pair of half plates that are formed are at open positions that open in a substantially V shape at an acute angle to the horizontal closed position. Then, when the casing penetrates into the ground, the fixed casing abuts against the ground, so that the half-plates are pushed upward from the c-shaped form and rotated in the closing direction, so that the casing penetrates into the ground. Then, it is held in the horizontal closed position by the pressing resistance of the earth and sand. Also, if the casing is penetrated to a specified depth in the ground and then pulled up, the pressing resistance of the earth and sand disappears, and the two halves at the lower end of the fixed casing must rotate downward to their original open position by their own weight. become. Therefore, the bottom lid of the lower end of the fixed casing can be opened and closed automatically without requiring any manpower, and the efficiency of pile forming work can be improved.

In addition, even the hard ground layer can be easily excavated by the excavating bit provided at the lower end of the rotary casing so as to project inward. Moreover, since this excavating bit can excavate not only the peripheral part of the rotating casing but also the inner part surrounded by this rotating casing, it can be attached to the lower end surface of the fixed casing that descends together with the rotating casing with the bottom lid closed. Such ground resistance is reduced, which

The piercing operation is easy.

[Brief description of drawings]

FIG. 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 of the same apparatus, FIG. 3 is a sectional view showing a lower end portion of a fixed casing, and FIG. Fig. (A) is a side view showing one half-divided plate forming the bottom lid, Fig. 4 (B) is a side view showing the other split plate, and Fig. 4 (C) is a front view showing a pivot. FIG. 5 is a perspective view showing the lower end of the rotary casing. 1 ... Machine frame, 3 ... Rotating casing, 5 ... Fixed casing, 6 ... Hopper, 8 ... Hole for earth removal, 9 ... Excavation bit, 11 ... Bottom lid, 12, 13 ... … Half plate, 14 …… Axis, 15 …… Bracket, 16 …… Stopper piece.

Claims (1)

[Scope of utility model registration request] 1. A pile forming apparatus comprising: a casing suspended from a leader and connected to a lower portion of a machine frame; and a hopper provided at an upper portion of the casing for charging a pile material. And a fixed casing, and at the lower end portion of the fixed casing, a pair of half-divided plates forming a bottom lid having a diameter larger than that of the fixed casing, with a center of a pivot arranged along the half-division lines of the fixed casing. The bottom end of the rotary casing is pivotally attached so as to rotate between a horizontal closing position that closes the opening and a half-opening position where each half plate is opened at an acute angle with respect to the position. A pile forming device, which is provided so as to project inward.