JPH029127B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is used to remove boulders or boulders from the hole when excavating a hole for a cast-in-place concrete pile. It is related to the device.

(Prior technology) Cast-in-place piles are obtained by drilling a vertical hole in the ground at a construction site by hand or using various machines, inserting a reinforcing bar cage into the hole, and then filling it with ready-mixed concrete. This is a foundation pile.

There are two methods for creating cast-in-place piles: deep foundation construction using manual excavation, and methods using various machines.
Broadly speaking, there are the Benoto method, the earth drill method, the reverse circulation method, and the B/H method, which uses a large-diameter boring machine.

(Problem to be solved by the invention) However, since the deep foundation construction method is a manual excavation method that uses visual inspection, even if there are boulders or boulders in the hole, it can be removed to some extent, but the method using mechanical excavation However, there is a problem in that if there are more than a certain amount of boulders or boulders in the ground that is being excavated, excavation becomes impossible.

The present invention was made to solve the above-mentioned problems, and is effective in removing boulders and boulders existing in holes for cast-in-place piles by mechanical excavation by using a relatively simple device and simple operation. The purpose of this project is to improve the efficiency of this type of mechanical excavation and expand its range of application by making it possible to remove the excavated materials.

(Means for Solving the Problems) In order to achieve the above-mentioned object, in the present invention, a hollow cylinder with a bottom is divided into two parts along its center line, and one of the semi-cylindrical bodies is divided into two parts. The semi-cylindrical body is fixed to the outer cylinder of the telescoping cylinder which is placed in the center and can be freely extended and retracted, and its bottom plate is separated from the semi-cylindrical body so that the semi-circular bottom plate can be rotated upward via the hinge. The other semi-cylindrical body is fixed to the inner cylinder of the telescoping cylinder, a chevron-shaped protrusion is formed on the cut edge of the bottom plate of the semi-cylindrical body, and the upper end of the telescoping cylinder is fixed to the inner cylinder of the telescoping cylinder. It is connected to the lower end and suspended in the pile hole so as to be able to rise and fall freely, and is rotatably driven to constitute a stone removal device in the pile hole.

(Function) Since the device of the present invention is configured as described above, when the excavation device encounters boulders or boulders during mechanical excavation of a pile hole and becomes unable to excavate any further,
Once the drilling equipment is pulled out of the hole, the device of the present invention is attached to the lower end of the Kelly bar, suspended in the pile hole, and lowered to near the bottom of the hole.The telescopic tube is extended and one semi-cylindrical body is By further pushing down until it touches the bottom of the hole and rotating it via the Kelly bar, the boulders and boulders existing at the bottom of the hole are scooped up onto the bottom plate inside the semi-cylindrical body that has been pushed down.

If the telescopic cylinder is contracted and returned to its original state in this state, the semi-cylindrical bodies on both sides will meet to form a hollow cylinder. Therefore, by pulling this hollow cylinder out of the hole together with the Kelly bar, boulders and boulders inside the hole can be easily removed.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. In the figure, 1 is the ground, 2 is a crawler crane, 3 is its crawler, 4 is a rolling platform installed on the crawler 3 so that it can be moved freely, 5 is a crane boom attached to the rolling platform 4 so that it can be raised and lowered, and 6 is a crane A Kelly bar is suspended from the tip of the boom 5 so that it can be raised and lowered, 7 is a rotational drive device (hydraulic type) for the Kelly bar 6, 8 is a connecting arm that connects the rotational drive device 7 and the swing table 4, and 9 is a connection arm between the Kelly bar 6 and Crane boom 5 in parallel
The swivel guide rod 10 is a hydraulic swivel joint provided above the Kelly bar 6 so as to be rotatable relative to the Kelly bar 6, and the joint 10 is connected via its guide member 10a. The swivel guide rod 9 is slidable. Reference numeral 11 denotes a hydraulic hose reel, and a hydraulic hose (not shown) wound around this reel 11 is connected to a hydraulic pressure supply source (not shown) provided on the spinning table 4 and is also connected to a hydraulic hose reel (not shown) through a swivel joint 10. It is connected to a hydraulic cylinder, which will be described later, in the device A of the present invention, which is connected to the lower end of the Kelly bar 6.

Note that a drilling bucket (not shown) for an earth drill, which is an excavating device, can also be attached to the lower end of the Kelly bar 6 shown in FIG. 12 is a pile hole made by drilling the ground 1 with the earth drill.

Next, the apparatus for removing stones in a pile hole according to the present invention will be explained with reference to FIGS. 3 to 7. 13 is a pin (not shown) inserted into the lower end of the Kelly bar 6 and the pin hole 13a.
13b is a seat plate of a rectangular cylindrical connection bracket that can be detachably connected via the bracket. Reference numeral 14 denotes a cylindrical outer cylinder connected to the seat plate 13b and a flange 14a by bolts and nuts (not shown), and a cylindrical inner cylinder 15 that is slidably fitted into the outer cylinder 14 is provided. , the outer cylinder 14 and the inner cylinder 15 form a telescoping cylinder B. And this outer cylinder 14
A hydraulic cylinder 16 is inserted into the inner cylinder 15, and the base of the cylinder 16 is connected to a bracket 13c that projects below the connection bracket 13 using a connection pin 17.
The piston rod 16a of the cylinder 16
The lower end of the inner cylinder 15 is connected to the lower end of the inner cylinder 15 via a pin 18.

In addition, in order to form a bucket C, a hollow cylinder with a bottom is divided into two parts along its center line to form a semi-cylindrical body 2.
0, 21, and each of these semi-cylindrical bodies 20, 21
The telescopic tube B is placed at the center of the cylindrical body obtained by matching the above, and the lower end of the outer cylinder 14 of the telescopic tube B and the upper edge of the one semi-cylindrical body 20 are connected by three beams 22. The lower end of the inner cylinder 15 of the telescopic cylinder B and the vicinity of the upper edge of the other semi-cylindrical body 21 are connected and fixed by three beams 23. Note 2
Reference numeral 4 denotes a semi-circular reinforcing member attached along the inner peripheral surface of the semi-cylindrical body 20 at the joint between the beam 22 and the semi-cylindrical body 20;
This is a semi-circular reinforcing material attached along the inner circumferential surface of the semi-cylindrical body 21 at the joint with the semi-cylindrical body 21.

Further, the bottom plate portion of the semi-cylindrical body 20 has an outer peripheral edge 2
The semicircular bottom plate 26 is connected to the outer peripheral edge 20a of the bottom plate portion of the semicylindrical body 20 via the hinge 27, and the outer peripheral edge 2 of the bottom plate 26 is
6a (see FIG. 5) partially overlaps the upper surface of the outer peripheral edge 20a, and attaches the bottom plate 26 to the hinge 2.
7 as a fulcrum to be able to rotate upward.

Further, the cut edge of the bottom plate portion 21a of the semi-cylindrical body 21 is bent to form a mountain-shaped protrusion 21b, and a bit 21c is arranged on the lower edge of the protrusion 21b.
The tip of the bottom plate portion 21a is made to project slightly downward from the lower surface of the bottom plate portion 21a. Note that 21d is a reinforcing material provided at the peripheral wall portion of the semi-cylindrical body 21 and the corner portion of the bottom plate portion 21a.

Next, the method of use and operation of the apparatus of the present invention constructed as described above will be explained.

A pile hole 12 is drilled into the ground 1 using an earth drill (not shown) or the like attached to the lower end of the Kelly bar 6 suspended by the crawler crane 2 shown in FIG.
If, during excavation, a boulder or boulder 30 is encountered and further excavation becomes impossible, the ground drill should be pulled up from the pile hole 12, and then the device A of the present invention should be attached to the lower end of the Kelly bar 6. Then hang it in the pile hole 12 and place it in the A' position and the second position in Fig. 1.
As shown in the figure, after lowering the device of the present invention to near the bottom of the hole, the hydraulic cylinder 16 in the telescoping cylinder B is extended and the inner cylinder 15 is lowered relative to the outer cylinder 14. One semi-cylindrical body 2
1 is pushed down until it touches the bottom of the hole, and the rotary drive device 7 moves the bucket C through the Kelly bar 6.
Rotate it as shown by arrow D in Figure 2. When the bucket C rotates, boulders or boulders 30 are scooped up by the bottom plate portion 21a of the semi-cylindrical body 21 and housed in the bucket as shown by the chain line 30' in FIG. In this case, if the boulder 30 is large, the bottom plate 26 of the semi-cylindrical body 20 will be attached to the hinge 2 as shown in FIG.
Rolling stone 3 is rotated upward using 7 as a fulcrum.
Allow 0 to pass. After the boulders 30 have passed, the bottom plate 26 returns to its original horizontal state due to its own weight.

Further, the chevron-shaped protrusion 21b formed on the cut edge of the bottom plate portion of the semi-cylindrical body 21 has a function of preventing the stones once stored inside the bucket from rolling out again to the outside.

Once the boulders or boulders have been accommodated in the bucket as described above, the semi-cylindrical body 21 is raised from the state shown in FIG. 7 to the state shown in FIG. 6 by operating the hydraulic cylinder 16 and contracting the telescopic cylinder B. Then, after closing the bucket C, if the device A of the present invention is lifted out of the hole together with the Kelly bar 6 by a crane device,
Stones within the pile hole 12 can be removed.

(Effects of the Invention) As described above, the device of the present invention has a relatively simple structure and is therefore easy to manufacture. Furthermore, since it can be used by replacing it with the lower end of the kelly bar to which excavation equipment such as an earth drill is attached, setup and handling operations are easy. According to the device of the present invention,
Since cobbles and boulders in the pile hole can be easily removed, the efficiency of this type of mechanical excavation work can be significantly improved, and it is also possible to remove cobbles and boulders from the pile hole, which previously made mechanical excavation impossible. The advantageous effect is that it enables mechanical excavation in places and extends its application range.

[Brief explanation of drawings]

FIG. 1 is an elevational view showing the state of use of the device of the present invention;
Figure 2 is a sectional view of the main parts, Figure 3 is an elevation view of the device of the present invention, Figure 4 is a plan view thereof, Figure 5 is a bottom view of the device, and Figure 6 shows the bucket part of Figure 3. FIG. 7 is an elevational view showing a state in which one of the semi-cylindrical bodies is lowered. 1...Ground, 2...Crawler crane, 6...
Kelly bar, 7... Rotation drive device, 12... Pile hole, A... Device of the present invention, B... Telescopic tube, C... Bucket, 13... Connection bracket, 14... Outer cylinder, 15... Inner cylinder , 16...hydraulic cylinder, 20
...Semi-cylindrical body, 20a...Outer peripheral edge portion, 21...Semi-cylindrical body, 21a...Bottom plate portion, 21b...Protrusion, 2
2, 23...Beam, 26...Bottom plate, 27...Hinge, 30...Boulder or boulder.

Claims (1)

[Claims] 1 A hollow cylindrical body with a bottom is divided into two parts along its center line, and one of the semi-cylindrical bodies is fixed to the outer cylinder of an extendable and retractable cylinder arranged at the center of the cylindrical body, and its bottom plate is The semi-cylindrical body is separated from the semi-cylindrical body, the semi-circular bottom plate is attached to the semi-cylindrical body via a hinge so that it can rotate upwardly, the other semi-cylindrical body is fixed to the inner cylinder of the telescopic cylinder, and this semi-circular bottom plate is attached to the semi-cylindrical body so as to be able to rotate upwardly. A chevron-shaped protrusion is formed on the cut edge of the bottom plate of the cylindrical body, and the upper end of the telescoping tube is connected to the lower end of the Kelly bar so that it can be hung up and down in the pile hole and rotated. A device for removing stones in pile holes, which is characterized by: