JPS60126490A - Packet type drill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention is a packet-type excavator used for excavating vertical holes in civil engineering construction underground construction work, particularly for drilling holes for constructing cast-in-place concrete sheet piles. Regarding.

(Configuration and problems of conventional examples) In underground construction work in civil engineering and construction, it is often necessary to excavate vertical holes into the ground, especially when constructing cast-in-place concrete piles. A large diameter, deep vertical hole must be drilled prior to concrete pouring.

In this case, a method is usually used in which a cutting tool (auger, drill, etc.) with the required diameter is pushed into the ground and rotated to excavate the earth and sand. In order to smooth the cutting and draining process, bentonite is injected into the borehole.

When this method is used, bentonite wastewater discharged together with excavated soil enters rivers, ponds, etc., causing pollution problems.

Therefore, a method has been used in which a metal RM-shaped casing is inserted into the ground without using bentonite mud, and drilling is carried out by rotating a cutting tool within the casing while preventing collapse of the hole wall earth and sand.

However, in this case, a large amount of force is required to push the casing into the soil, and when the casing is pulled out, a large pulling force is required because the earth and sand that has become muddy due to groundwater etc. sticks to the outer wall of the casing. The actual situation is that the equipment for these operations is extremely expensive, and it is extremely difficult to drill holes with large diameters and deep holes.

Furthermore, in any of these conventional construction methods, it is difficult to remove large boulders, rock blocks, etc. that are mixed in the earth and sand and removed, and special means are required for this purpose.

(Technology related to the invention) As an example of a new proposal that can solve the problems of the conventional method as described above, a drilling bucket If is inserted into a cylindrical casing inserted into the ground and rotated. There is an excavation method in which a cutting tool installed along the outer circumference of the lower end of the hole packet is slightly protruded from the lower edge of the casing to excavate the earth and sand, and at the same time, a fluid such as water is circulated from inside the casing through the packet to discharge the earth and sand. .

To explain this proposed example with reference to Fig. 1, 1 is a casing made of a short cylindrical thin-walled metal pipe inserted into the soil;
A metal drum-shaped drilling packet 2 is inserted into this casing.

A discharge port 2a is opened on the top surface of the drilling packet 2, and a rotary rod 3 made of a hollow metal tube is connected to this. are attached by pivoting means.

The drilling tool 4 is configured so that its cutting edge rotation locus can be expanded or contracted by forward or reverse rotation of the drilling packet 2. During drilling, the cutting edge is enlarged below the lower end of the casing 1 as shown in the figure, and the cutting edge is expanded or retracted as shown in the figure. The rotary rod 3 is rotated by a rotary device that does not have a rotary mechanism, and the excavation cutter 4 is rotated through the drilling packet 2 to perform excavation.

Inside the casing 1, fluid is supplied by a circulating water device (not shown).
For example, water is fed to the appropriate size and flows as shown in the arrow to the casing 1.
and the vicinity of the excavating blade 4 from the gap between the packet 2,
The earth and sand cut down by the cutting edge is sucked into the drilling packet 2 from the opening (intake port) at the bottom of the packet along with the water flow, and is discharged to the ground through the rotating rod 3 from the discharge port 2a, and the circulating water The water from which the earth and sand have been separated by the device is fed back into the casing 1 and used for circulation.

Large boulders, rock masses, etc. in the cut-down earth and sand are floated up by the water flow and deposited in the drilling packet 2.

When the drilling packet 2 is filled with boulders, etc., the rotation is stopped, the opening (intake port) at the bottom of the drilling packet is closed, the circulating water flow is stopped, and the cutting edge of the drilling tool 4 is reduced, as shown in Fig. 2. As shown, the drilling packet 2'fr is pulled up from inside the casing 1, and the boulders and the like are discharged on the ground.

As described above, the earth and sand are cut down by the enlarged excavating knife 4 below the lower end of the casing 1, and following the lowering of the excavating knife 4, the casing 1 sinks almost by its own weight.

As the drilling depth increases, the casing 1 is successively supplemented upward by the joint 5ct 1a, and the rotating rod 3 is similarly supplemented by the joint 3a.

The hole is drilled to the required depth as described above, but according to this method, the casing prevents the sand from collapsing, so there is no need to use bentonite slurry, and the frictional resistance between the outer surface of the casing and the hole wall is small. insertion of the casing,
Pulling out becomes extremely easy.

(Structure of the Invention) The packet-type excavator according to the present invention can be used to carry out the above-mentioned excavation method, and has a discharge port on the top surface, an opening on the bottom surface, and a digging cutter on the outer periphery of the bottom surface. It consists of a drilling packet, a bendable shutter for opening and closing the opening of the drilling packet, and an opening/closing operation mechanism for the shutter, and the shutter is connected through a shutter guide extending from the bottom surface of the drilling packet to its inner surface. The opening/closing operation mechanism and the shutter, which are movably supported within the drilling packet and which are housed inside the drilling packet, are interconnected.

(Description of Embodiments) Hereinafter, details of the configuration of the present invention will be described based on embodiments shown in the drawings.

3, 4, and 5 show one embodiment of the packet type excavator of the present invention, and FIG. 3 is a front longitudinal sectional view;
FIG. 4 is a side vertical sectional view, and FIG. 5 is a sectional view taken along line AA in FIG. 3.

Reference numeral 2 denotes a drilling packet, which has a discharge port 2a on the upper surface connected to the rotary rod 3, and a cutter mounting plate 2b provided with the drilling cutter 4 on the lower surface.

A rectangular intake opening 5 is provided at the bottom of the drilling packet 2.

6 is a shutter guide having two rows of grooves parallel to each other.

The shutter guide 6 includes a horizontal portion 6a along the opening 6 and an arcuate portion 6 that rises continuously from the horizontal portion 6a.
b, and a vertical portion 6c continuous to the upper end of the arcuate portion 6b.

Reference numeral 7 denotes a shutter, which is constructed by combining a large number of slats formed from band-shaped metal plates, and has a known structure similar to those generally used as construction materials for warehouses, garages, stores, etc.

Both side edges of the slat of the shutter 7 are slidably supported by the shutter guide 6.

Reference numeral 8 denotes an opening/closing operation mechanism consisting of a hydraulic or pneumatic fluid pressure cylinder, to which a drive source is connected via a piping system (not shown).

As shown in the figure, the opening/closing operation mechanism 8 is disposed on one side of the drilling packet 2 with its axial direction perpendicular.

It is a rod that is fitted into the cylinder of the 9Fi opening/closing mechanism 8 and moves up and down.The tip of the rod is attached to the slat at the top end of the shutter 7, and the shutter 7 is pulled up and pushed down by its up and down movement.

As described above, the packet type excavator of the present invention is equipped with the shutter 7 facing the opening 6 of the excavation packet 2, and is configured to be opened and closed by the shutter guide 6 and the opening/closing operation mechanism 8.

In the above-described excavation method, when pulling up the drilling packet 2 filled with large boulders, etc., the opening/closing operation mechanism 8 is activated and the shutter 7 is pushed down along the shutter guide 6 to close the opening 5. chain

FIG. 3 shows a state in the middle of closing, and the shutter 7 moves in the direction of arrow A.

If you want to open the opening 6 to take in soil and sand at the beginning of excavation, move the rod 9 upward in the opposite direction to the above.
All you have to do is pull up shutter 7.

(Effects of the Invention) As explained above, the packet-type excavator of the present invention can capture earth and sand into the excavation hole packet and transfer it to the earth removal side by keeping the opening open during excavation. Large boulders, etc. can be taken in until the inside of the drilling packet is filled, and after the inside of the packet is filled, the opening can be closed with a shutter and the work of discharging the boulders, etc. can be carried out rationally. .

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of the excavation method to which the present invention is applied, FIG. 3 is a front vertical cross-sectional view of one embodiment of the packet-type excavator of the present invention, and FIG. 4 is a side vertical cross-sectional view thereof. FIG. 5 is a sectional view taken along the line AA in FIG. 3. 2...Drilling packet 2a...Discharge port 4...Drilling knife 6...Opening 6...Φ-Shutter guide 7-...Shutter 8... ...Opening/closing operation mechanism Fig. 3 3 cL 2 Fig. 5 A r -> A I! , C 7\ 6LOL b b

Claims (1)

[Claims] A drilling packet having a discharge port on the top surface, an opening on the bottom surface, and a drilling blade on the outer peripheral edge of the bottom surface, a bendable shutter for opening and closing the opening of the drilling packet, and opening and closing of the shutter. The shutter is movably supported via a shutter and a vine guide that extend from the bottom of the drilling packet to its inner surface, and the shutter is mutually connected to the shutter closing operation mechanism housed inside the drilling packet. A packet-type excavator connected to the