JPS5923111Y2 - long bucket for digging - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in an excavation packet that is attached to the tip of a kelly bar suspended from the excavation machine body above the ground surface using a wire rope or the like during excavation work for foundation pile holes.

Hitherto, various types of excavation packets have been developed, but as shown in FIG. 3, they generally have a relatively short length in the axial direction.

Therefore, the side length of the excavation packet 21 is necessarily short, making it difficult to maintain the straightness of the excavation packet.

For this reason, if the excavation hole is long, it will naturally curve, or if there is a boulder 22 in a position that protrudes into the excavation hole, the excavation packet, that is, the excavation hole will bend at the boulder 22 part, as shown in Figure 4, and the boulder 22 part will bend. When it passes, the excavation will return to the previous core of the borehole, and as a result, the borehole will be greatly bent by the boulders 22.

This improves the workability of excavation work using a Kelly bar, in which the excavation packet 21 takes in a packet capacity of earth and sand, pulls it up to the ground surface through the excavation hole, and discards it over and over again until the required depth is excavated. It was causing a bad hindrance.

Furthermore, there are many problems such as the curvature of the excavation hole, which may make it impossible to install required reinforcing bars in the subsequent process.In addition, in the conventional packet, the side cutter 23 is attached to the excavation packet 21 as shown in FIG. Since it is attached simply along the side circumferential surface of the opening, stones, etc. may get stuck in it, deforming the bottom cover 24 of the opening for scooping out soil, and preventing it from being completely closed when storing soil, causing excavated soil to flow out and disrupting the work. It called for efficiency.

This invention attempts to solve the above problems.
The packet that is attached to the tip of the Kelly bar for digging,
By coaxially connecting hollow cylindrical bodies equal to the outer diameter of the same packet, the internal capacity is large and a large amount of excavated soil can be carried out, and the axial contact surface with the excavation hole is large for good excavation guidance. The purpose of the present invention is to provide a long packet for excavation that can be used for various purposes.

In the present invention, a long hollow cylindrical body having an outer diameter equal to the outer diameter of the packet is coaxially connected to the upper side of the packet attached to the tip of the Kelly bar, and the packet and the hollow cylindrical body are communicated with each other. The present invention relates to a long packet for excavation which is characterized by the following.

Hereinafter, a detailed explanation will be given based on the embodiments shown in the accompanying drawings.

Figure 1 shows the excavation of a pile hole using the long packet for excavation according to the present invention. A guide leader 4 is installed vertically on the machine body at all times, and 4 is a Kelly bar 16 made of a triple rectangular tube structure that is suspended from the guide leader via wire lobes 5, etc. and gradually extends according to the excavation depth. Reference numeral 4 indicates a drive device for rotating the Kelly bar using a torque transmission method, and 7 indicates a long packet attached to the tip of the Kelly bar 4, which constitutes the gist of the present invention.

FIG. 2 shows the structure of the long packet, especially the packet attachment part, in detail, and the long packet 7 is composed of a lower end packet 8 and a hollow cylindrical body 9 connected to the lower end packet 8. The outer diameter of the hollow cylindrical body 9 is formed to be equal to the outer diameter of the packet 8.

The hollow cylindrical body 9 is coaxially connected to the packet 8, and the space that is prestige of both can be made into an excavated earth and sand filling tank.

The axial length of the long packet 7 is about 2 to 3 meters, which is suitable for the digging performance and the ability of the excavating machine, which will be described later.

Hereinafter, to further explain FIG. 2, 10 is a bottom plate formed in a substantially conical shape forming the bottom of the packet 8, 11 is a required number of bottom cutters attached to the bottom plate in the radial direction,
Reference numeral 12 denotes an earth and sand storage opening for scooping up excavated earth and sand, which is opened in the bottom plate 10 in front of the bottom cutter in the excavation rotational direction. 10 via a hinge 14.

Reference numeral 15 designates a side cutter which is attached to the lower end of the outer periphery of the packet 8 so that the cutting edge thereof is diagonally downward in the excavation rotation direction and slightly protrudes from the lower end surface of the outer periphery of the packet 8. In this embodiment, two side cutters are provided. The distance between the cutting edges is slightly larger than the outer diameter of the packet 8.

Reference numeral 16 denotes a locking part that protrudes from the center of the upper end of the packet 8 and has a pin hole.The cable bar 4 is engaged with the locking part 16 through the pin 17, and the Kelly bar 4 and the long packet 7 are connected to each other. It is installed integrally.

A support portion 18 into which the Kelly bar 4 is inserted and supported is provided at the center of the upper end of the hollow cylindrical body 9, and a required number of windows 19 are provided in the lower half of the hollow cylindrical body. A crank (not shown) used when the excavated soil in the packet 8 is discharged onto the ground surface by the same section.

) operations can be performed.

To describe the procedure for pile hole excavation work using the long packet 7 having the above configuration and the operation of the long bucket I, the long packet 7 is integrally attached to the Kelly bar 4 as described above in FIG. Because of this, the drive device 6
When rotational torque is applied to the long packet 7, the long packet 7 rotates together with the Kelly bar 4.

Then, the bottom cutter 11 and the side cutter 15 excavate, and as the long packet 7 rotates, the bottom cutter 1
The bottom cover 13 opens inward through the hinge 14 due to the upper pressure of the excavated earth and sand that accumulates in front of the packet 1.
The inside of the packet 8 is sequentially filled with excavated earth and sand.

When the capacity of the packet 8 is filled with earth and sand, the drive device 6 is stopped, the wire rope 5 is wound up, and the long packet 7 is pulled up to the ground. From this point on, the long packet 7 is not rotating, and therefore the excavated earth is Since the bottom cover is not newly excavated, there is no longer any externally applied soil on the bottom cover 3, and due to the weight of the filling earth and sand in the packet 8, the bottom cover 13
will be automatically closed.

Furthermore, in the long bucket l-7 of the present invention, the side cutter 15 is disposed so that its cutting edge is diagonally downward in the excavation rotation direction and slightly protrudes from the lower end surface of the outer periphery of the packet 8, as described above. 15 and the outer circumferential surface of the packet 8.

Therefore, the bottom cover 13 does not deform or catch stones, so it can be completely closed, and excavated earth and sand can be prevented from flowing out.

The wire rope 5 is further wound around the long packet 7, which has been closed as described above, and the long packet 7 is brought to the ground, and the earth is discharged to a desired position, thereby completing one process of excavation.

Thereafter, the above steps are repeated until the required excavation depth is obtained.

In the above-mentioned excavation process, the long packet 7 according to the present invention can maintain the directness of excavation at all times because the hollow cylindrical body 9, which is elongated in the excavation direction, acts as a guide surface during excavation.

That is, when the quintuple protrudes into the excavation hole, the side surface of the lower packet 8 first comes into contact with the boulder, and receives a lateral force from the boulder, causing it to bend in the excavation direction.

However, the side surface of the hollow cylindrical body 9, which is integrally attached to the top of the packet 8, is slidably supported by the inner wall of the excavation hole, and the excavation progresses while resisting the lateral force of the boulders, so the direction of excavation is not bent and goes straight. This allows excavation to be carried out at all times while maintaining stability.

Further, the straight excavation property of the long packet 7 as described above is effective even when the ground layer varies in softness, hardness, etc.

Furthermore, the long packet 7 according to the present invention supports the Kelly bar 4 at two points during excavation, with the lower end supported by the packet 8 and the middle part of the Kelly bar 4 supported by the support part 18 of the hollow cylinder 9. Even if the kelly bar 4 is subjected to bending stress or torsional stress due to an increase in load or the presence of boulders, sufficient strength can be obtained and breakage of the kelly bar 4 can be prevented.

Furthermore, if the insides of the hollow cylindrical body 9 and the packet 8 are communicated with each other to constitute the long packet 7, and the window portion 19 is completely closed, excavated earth and dirt can be deposited not only inside the packet 8 but also inside the hollow cylindrical body 9. This increases the soil storage capacity and reduces the number of excavation steps.

Therefore, the construction period required for excavation can be significantly shortened.

As described above, the long packet for excavation according to the present invention can have the following effects.

(1) Since a long hollow cylindrical body is provided and is configured to slide on the inner wall of the excavation hole, the excavation hole can be excavated in a straight line even if boulders etc. are present, so the excavation hole will not be curved.

(2) Since the hollow cylinder is connected to the packet,
The hollow cylindrical body and packet allow the nationally prestigious space to be used as an excavated soil filling tank, and a large capacity of excavated soil can be accommodated, thereby reducing the number of excavation steps and shortening the construction period.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the state of pile hole excavation work, Fig. 2 is a side view showing the structure of the long packet attachment part, Fig. 3 is a side view of a conventional excavation packet, and Fig. 4 is a conventional excavation packet. It is an explanatory view showing the excavation state when using. 4...Kelly bar 17...Long packet, 8...Packet, 9...Hollow cylindrical body, 15...Side cutter 18.・・・・・・
Support part.

Claims (1)

[Scope of utility model registration request] A long hollow cylindrical body having an outer diameter equal to the outer diameter of the packet is coaxially connected to the upper side of the packet attached to the tip of the Kelly bar, and the packet and the hollow cylindrical body are connected in series. Features: Long packet for excavation.