JPS6164990A - Auger bit for controlling flowing-in soil and sand - 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 Application of the Invention] The present invention relates to the shape of the tip of an auger in a drilling device that inserts an auger and an auger bit into a tube to excavate the tip of the tube and simultaneously propel the tube. .

[Background of the invention]

A conventional example of a device for excavating by inserting an auger and an auger bit into a pipe will be described with reference to FIG. This device excavates the tip of the buried pipe 1 and at the same time excavates the tip of the buried pipe i.
There are 9 devices that can be propelled and buried. A leading pipe 2 is connected to the front of the buried pipe 1, and a leading pipe shoe 3 is further connected to the tip of the leading pipe 2. Inside these buried pipes 1 and leading pipes 2 is an auger inner pipe 5 in which an auger 4 is housed.
is inserted. The auger 4 has the shape of a so-called screw conveyor and is used to send excavated earth and sand backward. The auger internal pipe 5 communicates with a leading pipe shoe 3 provided at the tip of the buried pipe 1. Lead pipe shoe 3
The inner space 6 has an inner diameter that is larger than the inner diameter of the auger inner tube 5.

In other words, a conical space that expands toward the tip? The auger bit 7 is connected to the tip of the auger 4 in the enlarged internal space fi41 of the leading pipe tube 3. This auger bit 7 is a cutting blade.

With the above configuration, when the auger 4 is rotated around its axis, the auger bit 7 also rotates to perform excavation, and the excavated earth and sand is sent rearward by the auger 4 and discharged. Simultaneously with this excavation, the buried pipe 1 is propelled forward by a propulsion device (not necessarily shown) to proceed with the burying work.

Further, in this conventional example, the leading pipe shoe 3 has a neck opening that can be attached to the buried pipe 1. That is, a swash plate 8 is provided on the rear side of the leading tube shoe 3 in contact with the latter. This swash plate 8 is a substantially cylindrical member, and has a shape in which the end that contacts the leading pipe tube 3 is cut diagonally. Therefore, when the swash plate 8 is advanced by the swash plate advancing piston 9, it comes into contact with the leading tube shoe 3 in a biased manner, and the reverse tip tube/knee 3 can be brought into a tilted oscillating state. Furthermore, the swash plate 8 drives the swash plate rotation piston lo.
) When it is rotated through the hinge gear 1), the direction in which the four-tip shoe 3 swings? It can be changed freely. This allows the excavation direction to be completely adjusted freely.

[Problems with background technology]

The conventional device as described above has the following problems. That is, there is no problem when excavation work is carried out on stable ground with little groundwater, but when there is a lot of groundwater and the pressure head of the groundwater is high, a large amount of excavated soil may flow into the auger river pipe 5 during excavation work. Put it away. For this reason, the inside of the shaft, where the main body of the device for rotating the auger 4 or the device for propelling the buried pipe is installed, is buried with this large amount of earth and sand, and there are cases where the entire construction work has to be stopped. Or, a large amount of earth and sand from the excavation site may flow out, causing roads and houses to cave in.
Dogs were sometimes a big problem.

In order to solve this problem, conventional work was carried out separately from the excavation work to pump up groundwater near the excavation site and lower the water head of the groundwater at the excavation position. However, this led to a rise in construction costs and also caused social problems such as the need to separate wells from each other.

[Purpose of the invention]

The present invention has been made in view of the above problems, and even in cases where a large amount of earth and sand may flow into the pipe at once due to the pressure of groundwater, it is possible to freely adjust the amount of earth and sand flowing into the pipe. [Summary of the Invention] The auger bit for controlling inflowing sediment according to the present invention has a structure in which the auger bit is connected to the tip of the auger from the inner diameter of the inner pipe for the auger. Also, an enlarged portion having a large cross section is provided. This makes it possible to completely block off the inner pipe for the auger by moving the auger back relative to the lead pipe shoe when there is a risk that the groundwater pressure will rise and a large amount of earth and sand will flow in. I made it. In addition, by adjusting the backward suction, the amount of inflow of uphill soil can be adjusted freely. It should be noted that the mechanism for moving the auger forward and backward relative to the shoe of the previous 4th generation already exists in the conventional device, and this is the mechanism of the present invention. It is something to be used.

[Embodiment of the Invention] A first embodiment of the invention will be described with reference to FIGS. 2 and 3. In this embodiment, the enlarged internal space 6 of the guide tube shoe 3 forms a conical shape that widens toward the tip. The tip of the auger 4 expands into a trumpet-like shape along the inner surface of the conical space of the guide pipe tube 3, and integrally connects the auger bit 7. The bottom of the trumpet-shaped portion of the auger 4 forms an enlarged conical portion 21i similar in shape to the conical shape of the leading tube shoe. The auger bit 7 is located perpendicular to the rotating surface of the tip of the auger 4, and extends r* in a cross shape on the rotating surface. Then, the excavated earth and sand is released to the rear through the internal space 67, and the auger is placed inside 1'5.
In the above embodiment, when the auger 4 and the auger bit 7 are used to perform rotary stone excavation, the soil excavated by the auger bit 7 is removed from the tip of the four pipe shoe 3. It flows into the auger inner chamber 5 through the inner space 6 and is sent to the rear by the auger 4.If there is a fear that a large amount of earth and sand may flow into the auger inner chamber 1f5 at once due to the pressure of groundwater, , the p auger 4 is moved back relative to the leading pipe shoe 3 by a conventional existing mechanism (not shown).Then, a conical enlarged part 21 provided at the tip of the auger 4 and a tip having a conical internal space are removed. The gap 23 between the four-pipe shoe 3 and the auger 4 can reduce the amount of earth and sand flowing into the J.
By completely retracting - (Lf), it is also possible to make it 1, and it is also possible to close the inner tube 5 for the geoger.

[Implementation row of the pond of invention]

(1) Q+Ig In the first embodiment, the enlarged part 21 provided at the tip of the auger 4 has a conical shape, but in the second embodiment, the enlarged part 21 has a simple cylindrical shape. You can also. In other words, the leading tube shoe 3 is enlarged, y'c, and the same part is not fully open to the full conical shape, but expands toward the tip b.
l-3 truncated cone, and the bottom of the truncated cone and the enlarged cylindrical part lii] Gap? If you adjust it, the same effect as above can be achieved.
Ru.

(2) The previous δ - In Example 8, the tip of the moth 4 (the whole had a gorappa shape, but as shown in the third part 109'lJ shown in Figs. 4 and 5) It is also possible to use only a conical shape instead of a trumpet shape.In addition, in this third embodiment, a bolt 25 is passed through from the grave side of the conical enlarged part 24 formed at the tip of the auger 4 to connect the auger bit 7. It is said that

(3) Furthermore, in the conventional example shown in FIG. 1, the portion 1-force 4 corresponding to the leading tube shoe 3 was only connected coaxially to the rear auger 4. This is a structure in which the leading unit 3 can be oscillated, rather than the auger 4 and q blade - gavit 7, which is mandatory for oscillating.71) 1) Deruru. However; 1. Invention ([-
In actual Fri, the following steps cannot be achieved in terms of the effectiveness of the invention unless inspection is performed so that the tip of the auger 4 and the auger focus 7 can be rotated in synchronization with the swinging of the leading pipe shoe 3. Therefore, in the fourth cauldron auction (not shown), the auger in the part that can be oscillated is in contrast to the pre-bath t; shall be connected to the As a result, the tip of the auger 4 slides and synchronizes with the tip of the oscillating jaw 3 to bring it into a oscillating state.

〔Effect of the invention〕

As described above, according to the present invention, even when 5 to 1 of earth and sand flow in at once due to the pressure of groundwater, it is possible to
N+ between the enlarged part inserted into the tip of the moth and the leading tube shoe
By adjusting p t p, the inflow of earth and sand m1 can be freely adjusted.

[Brief explanation of drawings]

Is this the tip of the conventional M membrane tube? FIG. 2 is a side view of a device that simultaneously excavates and propels a buried pipe to bury the pipe, and FIG.
3 is a view showing the front view of FIG. 2, FIG. 4 is a view showing a third embodiment of the present invention corresponding to FIG. 2, and FIG. 5 is a front view of FIG. 4. . 1... Buried pipe, 2... 4 tip pipes, 3... Leading pipe shoe, 4... Auger, 5... Inner pipe for auger, 6... Space, 7... Auger dot G, 8... Swash plate, 9... Piston for advancing the swash plate, 10... Scrap [masked diversion histone,
1)...Pinion gear, 21.24...Enlarged part, 2
3...IVI gap.

Claims (3)

[Claims] (1) This is a device that excavates the tip of a buried pipe and at the same time propels the buried pipe to bury the pipe. An auger inner pipe containing an auger that sends excavated soil backward is inserted into the buried pipe. The inner pipe for the auger communicates with a leading pipe shoe provided at the tip of the buried pipe, and an auger bit, which is an excavation blade, is connected to the tip of the auger inside the enlarged interior of the leading pipe shoe, in which: The distal end of the auger is provided with an enlarged section having a larger cross section than the inner diameter of the inner auger tube, and by retracting the auger relatively to the leading tube shoe, this enlarged section becomes larger than the inner diameter of the auger inner tube. An augerbit for controlling inflowing sediment, which is characterized by being able to adjust the amount of sediment flowing into the inflow. (2) In claim 1, the enlarged interior of the leading tube shoe forms a conical space that widens toward the tip, and the enlarged portion provided at the tip of the auger has a similar shape to the conical shape. An inflow sediment control augerbit with a conical shape. (3) In claim 1, the leading pipe shoe has a structure capable of swinging relative to the buried pipe to correct the direction of propulsion, and the auger in the portion corresponding to the leading pipe shoe is An auger bit for controlling drifting sediment that is connected to a rear auger by a joint and can adjust the amount of sediment inflow even in the swinging state.