JPS6033186Y2 - Bottom-expanding excavator for foundation piles - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an excavator used for excavating a hole for an expanded foundation by casting in place.

As a device for enlarging the bottom of a borehole by advance polling, we have previously proposed a device equipped with a widening wing that can be moved in and out of the main body. Even though the above-mentioned wings allowed for more extensive digging, it was not possible to completely remove the slime that had settled to the bottom and to correct the unevenness of the bottom surface caused by preliminary polling to a state suitable for the bottom surface of the foundation pile.

This idea was developed by applying a simple method to the bottom of the main unit.
Eliminating the above-mentioned drawbacks of the conventional equipment, it is possible to remove slime and repair the bottom of the hole before enlarging the bottom peripheral side using the wing, and the shape of the bottom is always constant regardless of the model of advance polling. The aim is to provide a machine with a new configuration that can drill holes.

This invention will be explained in detail below using illustrated examples.

Reference numeral 1 denotes a pipe body of a required length connected to a reverse pipe 2, and is generally called a Kelly bar.

Reference numeral 3 denotes a cylindrical main body, with wing entry and exit gaps 4, 4 vertically provided on both sides, and a pair of wings 5, 5 for widening, each having a cutter inside the gaps 4, 4, fixed to the upper part of the main body. The upper end portions are pivotally supported on the pins 6, 6, and are slidably suspended so as to move in and out of the gaps 4, 4.

Further, the tube body 1 is fitted into the center of the main body 3 so as to be vertically movable, and the lower end opening is positioned above the main body bottom plate 3a.

The top side ratio of the tube body 1 is such that a pair of p-stoppers 7.7 for keeping the relative movement with the body 3 within a certain range are connected to the body top plate 3.
It protrudes upward and downward with b as the boundary.

Furthermore, a tie rod 8.
8 are provided diagonally, and the wings 5, 5 are gradually moved downwardly by the tie rods 8, 8 as the tubular body 1 moves downward, and protrude out of the main body from the gaps 4, 4. It is supposed to be done.

However, in this invention, a plurality of suction ports 9, 9 are bored in the bottom plate 3a of the main body, and a resistance plate 10 of a desired diameter is rotatably and slidably inserted into a support shaft 11 and protrudes from the center of the bottom plate. Furthermore, a cutter 12.12 for correcting the bottom surface of the hole is installed at an angle between the resistance plate 10 and the peripheral edge of the bottom plate.

It is preferable that the dimensions of the resistor plate 10 be approximately equal to the diameter of the drill tip hole (see FIG. 4) created by the preceding poling, and that the resistor plate 10 has the shape shown in the figure, but is not particularly limited to such a configuration. The size and shape are arbitrary.

The operation of the above embodiment will be explained with reference to the following drawings starting from FIG.

First, the pipe body 1 is connected to the reverse pipe 2 passing through the above-ground rotary table, and the main body 3 is lowered through the pipe body 1 in a suspended form at the bottom of the hole 13 that has been previously polled.

At this time, the wing 5.5 connects the tie rods 8, 8 and the tube body 1.
Due to the tensile force of the main body 3 and the weight of the main body 3, the main body 3 is suspended in a narrowed state and passes through the hole.

When the bottom surface 3a of the main body reaches the hole bottom 14 shown in FIG. 4, rotation is applied to the main body 3 via the reverse pipe 2 and the pipe body 1, and suction is simultaneously performed.

As a result, the cutters 12.12 on the bottom plate 3a stir the slime on the bottom of the drilled hole, and the slime flows through the suction port 9 into the pipe body 1.
It is sucked into the air and discharged to the ground through the reverse pipe 2.

Further, as the main body 3 descends, the cutter 12.12 excavates the hole bottom 14 until the resistance plate 10 reaches the bottom surface 16 of the drill tip hole 15, that is, the ground. Fix it.

When the resistance plate 10 comes into contact with the ground, the thrust of the tube body 1 and the resistance plate 1
Due to the reaction force of 0, a sliding action occurs between the tube body 1 and the main body 3, and the wings 5, 5 are moved from the tube body 1 via the tie rods 8, 8.
is opened to the outside of the main body 3, and as shown in FIG. 5, enlarged excavation of the bottom peripheral side is performed by the wings 5.5, which expand while rotating together with the main body 3.

Further, the excavated earth and sand is discharged to the ground from the suction port 9 in the same manner as in the case of the slime described above.

When the bottom-expanding excavation is nearing completion, the sliding of the tube body 1 is completed, and the change in the rotational transmission torque is checked by an instrument connected to the measuring rod 17, and the tube body 1 is pulled up.

As shown in Fig. 6, when the lifting begins, the wings 5, 5 automatically return to the inside of the main body due to the opposite action to that during bottom expansion.
After that, the main body 3 is pulled and raised.

Note that the wings 5, 5 can be opened by lowering the main body 3 halfway into the drilled hole 13 and pushing down the tubular body 1 while pulling it with a wire rope.

In this case, although not shown in the figure, widening excavation occurs at the intermediate portion of the hole being drilled.

As described above, this device has a resistance plate 10 of a required size protruding from the center of the bottom of the main body 3, and a cutter 12, 12 for drilling the bottom of the hole is installed between the resistance plate 10 and the periphery of the bottom. Therefore, slime removal and drilling bottom surface correction can be performed automatically by simply rotating the main body.

Also, since the main body rotates while being supported by the central resistance plate,
Centering becomes easy, and after the resistance plate comes into contact with the ground, no further excavation of the bottom of the hole occurs, so there is no deviation in the bottom position due to over-digging, and the shape is always suitable for the bottom of the foundation pile. For example, it can be shaped like a plate.

Furthermore, the bottom of the drilled hole can be corrected to an inclined surface by using the resistor plate in the center of the bottom and the cutter installed at an angle, making it easy to drain slime after reinforcing reinforcing steel and prevent the negative impact of slime on foundation piles. It can be completely removed.

[Brief explanation of the drawing]

The drawings show one embodiment of the bottom-expanding excavator for foundation piles according to this invention. Figure 1 is a partially longitudinal front view, Figure 2 is a partially longitudinal front view when the wings are opened, and Figure 3 is a partially longitudinal front view with the wings open. The figure is a longitudinal sectional view of the bottom of the main body, Fig. 4 is a longitudinal sectional front view when suspended from the bottom of the drilling hole, Fig. 5 is a vertical sectional front view when bottom expansion excavation is completed, and Fig. 6 is a vertical sectional view of the main body being lifted up. There is a diagram.

Claims (1)

[Scope of utility model registration request] A pipe body of the required length to be connected to the reverse pipe is inserted into the center of a cylindrical body with vertical wing entry/exit gaps on both sides so that it can move up and down, and a pair of wings for widening are suspended inside the main body so that they can move in and out. In a bottom-expanding excavator that is installed on both sides of the pipe body and has tie rods for entry and exit extending between the pipe body and the width-widening wing, a resistance plate of the required size is protruded from the center of the bottom of the main body, and the resistance plate A bottom-expanding excavator for foundation piles, characterized in that a cutter for excavating the bottom of the hole is installed between the □ and the periphery of the bottom of the main body.