JPH0324712Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an excavating device used in construction machinery, etc., and particularly to a frozen soil excavating device that excavates frozen soil using an auger.

[Prior Art] Foundation work in civil engineering and construction works includes piling work, and one type of piling work includes excavation work using an auger.

Excavation with an auger is not suitable for hard soil due to its structure, and is limited to cases where the soil is soft to some extent.

[Problems that the invention aims to solve] Therefore, conventional auger excavation equipment cannot excavate in hard frozen frozen soil, and excavation work must be carried out by waiting for the soil to thaw or permafrost. In this case, it was impossible to excavate with an auger, and other means of excavation had to be used.

In view of these circumstances, the present invention is designed to enable auger excavation even in hard frozen frozen soil.

[Means for solving the problems] The present invention has a double pipe structure for the shaft of the auger screw, communicates the base end of the inner pipe with the steam source via a rotary joint, and installs a check valve type valve in the cutter head. The invention is characterized in that the excavation is carried out while the steam supplied to the inner pipe via the rotary joint is jetted out from the valve.

[Operation] The steam ejected from the valve after passing through the inner pipe while being insulated by the air between it and the outer pipe melts the frozen soil in the cutter head, making it possible to excavate with an auger screw.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is an overall schematic diagram of a drilling equipment according to the present invention, in which 1 indicates an auger screw, 2 a screw drive device, 3 a rotary joint, and 4 a cutter head.

The shaft portion 5 of the auger screw 1 rotated by the screw drive device 2 has a double tube structure, and the inner tube (described later) of the shaft portion is hollow and is connected via a rotary joint 3 (not shown). It communicates with the steam source. The steam supplied through the rotary joint 3 is ejected from the tip of the auger screw 1,
The frozen soil is melted and the cutter head 4 excavates this melted part.

The auger screw 1 will be described in detail below with reference to FIGS. 2 to 6.

The auger screw 1 is a screw unit 8 having a male fitting part 6 at one end and a female fitting part 7 at the other end.
It is made by connecting.

The screw unit 8 is connected to the male fitting part 6.
This is done by fitting into the female fitting part 7 and inserting a pin 9 for preventing removal into this fitting part.

The shaft portion 5 of the screw unit 8 is a hollow outer tube 1.
0 and a hollow inner tube 11, and an outer tube 1.
A male fitting part 6 is formed at one end of the 0, and a female fitting part 7 is formed at the other end. The external shape of the male fitting part 6 is such that it can be fitted into the female fitting part 7, and a connecting hole 12 is bored on the end surface side of the male fitting part 6, and an outer tube is formed. An inner tube 11 is supported by the male fitting portion 6 so as to communicate with the connecting hole 12 concentrically with the inner tube 10 . A seal joint 13 that fits into the communication hole is fixed to the unsupported end of the inner tube 11, and the seal joint 1
A sealing material 14 is attached to the outer peripheral surface of the connecting hole 3 so that the seal joint 13 is sealed when it is fitted into the connecting hole 12.

FIG. 5 shows a cutter head 4, which has a male fitting part 6 having the same shape as the male fitting part 6 of the screw unit 8, and a through hole 15 which is concentric with the axis. has been drilled. A check valve type valve 16 is provided at the tip of the through hole 15, and the cutter head 4
An arch-shaped notch 18 is provided in the cutter 17 at the tip to prevent interference between the cutter 17 and the valve 16. The structure of the valve 16 is as shown in FIG. A support plate 20 is attached to the tip of the hollow cylindrical body 19.
A bearing portion 21 is supported by the bearing portion 21, and a bolt 22 is slidably inserted into the bearing portion 21, and a valve body 23 is fixed to the tip of the bolt. A nut 24 is screwed onto the base end of the bolt 22, and a spring 25 is provided in a compressed state between the nut 24 and the bearing portion 21, and presses against the valve body 23 and the cylinder body 19 with a required force. ing.

With the above structure, steam is supplied to the inner tube 11 through the rotary joint, and when the pressure exceeds the required level, the steam pushes the valve body 23 open and is ejected from the tip of the cutter head 4. The heat of the ejected steam melts the frozen soil at the tip of the cut head, making it possible to excavate. Further, as described above, the shaft portion 5 has a double tube structure, and the air between the inner tube 11 and the outer tube 10 acts as a heat insulating layer to prevent cooling of the steam.

[Effects of the invention] As described above, according to the invention, since the shaft portion of the auger screw has a double pipe structure, the air between the inner pipe and the outer pipe becomes a heat insulating layer, and the steam flowing inside the inner pipe is It is injected from the valve in the cutter head at a high temperature without cooling down, making it possible to efficiently melt frozen soil, making it possible to excavate frozen soil using an auger crew, which was previously difficult to excavate.

[Brief explanation of drawings]

Figure 1 is an overall schematic diagram showing the outline of the present invention, Figure 2
The figure is a side view of the auger screw, Figure 3 is a sectional view of section A in Figure 2, Figure 4 is a view taken along the line B-B in Figure 3,
FIG. 5 is a side view of the cutter head, and FIG. 6 is a sectional view of section C in FIG. 5. 1 is an auger screw, 3 is a rotary joint, 5 is a shaft portion, 10 is an outer tube, 11 is an inner tube, and 16 is a bubble.

Claims (1)

[Scope of utility model registration request] The shaft of the auger screw has a double pipe structure, and the proximal end of the inner pipe is connected to the steam source via a rotary joint.A check valve type valve is installed in the cutter head, and the steam is supplied to the inner pipe via the rotary joint. A frozen soil excavation device characterized in that it is configured to excavate while blowing out steam from the valve.