JPS602305Y2 - Excavation device for pipe burial - Google Patents

Description

[Detailed description of the invention] This invention relates to an excavation device for management construction that can limit the amount of earth and sand taken in.

Conventional pipe burying equipment that uses a lead pipe as a guide to dig underground uses a cutter installed at the front of the main body to take in the excavated earth and sand from the earth intake port.
If the earth and sand underground that the main body excavates is non-self-supporting sand, the earth and sand in the part that is not excavated will also collapse and naturally flow into the intake port.

As a result, a cavity is formed around the buried pipe, causing ground subsidence, or the pipe itself sinking.

In particular, the natural inflow of earth and sand that occurs when the cutter head is stopped underground causes the screw conveyor to stall and become unable to rotate the next time it is rotated, making it difficult to excavate the main body.

This invention was made with the aim of improving this problem.When excavating, the amount of earth and sand flowing into the earth and sand intake port is restricted to an appropriate amount, and when the cutter head is stopped underground, the earth and sand intake port is closed. We provide a management construction excavation device that has a screw conveyor with a lid that prevents earth and sand from naturally flowing in, so that if the ground subsides after burying the pipe, or if the cutter head is stopped underground, it can be removed again. This is intended to prevent the excavation of the main body from becoming difficult.

This invention will be described in detail below with reference to an illustrated embodiment.

In the figure, reference numeral 1 denotes the main body of the management facility excavation device, and a hollow fixed shaft 2 is provided in the center.

The proximal end of the fixed shaft 2 is supported by a support 1a provided at the rear of the main body 1, and a rotary drum 4 is supported on the outer circumference of the distal end of the fixed shaft 2 via a bearing 3. There is.

A ring gear 4a is formed at the rear end of the rotating body 4, and a final stage side 5a of a reduction gear 5 is meshed with this ring gear 4a, and a starting stage side 5b of the reduction gear 5 is connected to the rear end of the main body 1. The drive shaft 8 is meshed with a gear 9 of a drive shaft 8 that is directly connected to a rotary drive source 7 such as a hydraulic motor housed in the drive shaft 8 .

Further, a cutter head 10 provided at the front of the main body 1 is fixed to the front end of the rotary barrel 4, and is adapted to rotate together with the cutter head 10. The tapered front surface is provided with cutters 11 and an elongated opening 10a for introducing earth and sand excavated by these cutters 11 into the cutter head 10.

Further, within the cutter head 10, a connecting pipe 12 is provided, one end of which is fixed to the tip of the fixed shaft 2.

This connecting tube 12 connects a leading tube (not shown) to an end protruding from the tip of the cutter head 10 to provide guidance when the main body 1 is excavated, and a screw conveyor 13 is housed inside.

- One end of the screw conveyor 13 is connected to the tip of the drive shaft 8 that passes through the fixed shaft 2 and extends toward the cutter head 10, and is rotated by the rotary drive source 7 via the drive shaft 8. At the same time, the other end side of the screw conveyor 13 is connected to a screw conveyor in a leading pipe (not shown) connected to the connecting pipe 12, and is connected to the earth and sand intake port 12a.
The soil that has been taken in is transported forward through the lead pipe.

On the other hand, a lid 14 of a size that can close the earth and sand intake port 12a from the inside is fixed to the outer circumference of the screw conveyor 13 inside the connecting pipe 12.

This lid body 14 is made of a plate body curved to approximately the same curvature as the connecting pipe 12, and together with the screw conveyor 13, the connecting pipe 12
While rotating along the inner surface of the screw conveyor 2, the earth and sand intake port 12a is opened and closed to limit the amount of earth and sand taken in from the earth and sand intake port 12a, and when the screw conveyor 13 is stopped, the earth and sand intake port 12a to the lid body 14
The opening is closed by the opening 12a to prevent the natural flow of earth and sand into the connecting pipe 12 from the earth and sand intake port 12a.

Note that as a means for stopping the screw conveyor 13 at the position where the lid body 14 closes the earth and sand intake port 12a, a mark is attached to a part of the screw conveyor 13 that protrudes from the vertical pile on the reaching side, and this mark is placed at a predetermined position. For example, the screw conveyor 13 may be stopped when it reaches the upper position.

Further, the amount of soil taken in to be restricted can be easily adjusted by changing the length 1 of the overlapped portion of the lid body 14 shown in FIG.

Further, numeral 15 in the figure is a scraper for taking the earth and sand in the cutter head 10 into the earth and sand intake port 12a.

Therefore, when burying the pipe body 16 that follows the main body 1, first, a leading pipe (not shown) is left in the planned route from within the vertical shaft, and then a connecting pipe 12 is placed at one end of this leading pipe and protrudes toward the front of the main body 1.
Connect one end of.

In this state, the main body 1 is press-fitted into the ground while rotating the cutter head 10 and screw conveyor 13 by the rotary drive source 7, and the subsequent pipe bodies 21 are sequentially buried. Accordingly, the earth and sand excavated by the cutter 11 is taken into the cutter head 10 through the opening 10a, and further into the connecting pipe 12 through the earth and sand intake port 12a, and then carried forward through the leading pipe by the screw conveyor 13. .

In addition, the screw conveyor 13 is connected to the earth and sand intake port 12a.
Every time the screw conveyor 13 rotates, the lid body 14 attached to the screw conveyor 13 closes the soil intake port 12a and limits the inflow amount, so even when buried in sandy soil, more soil than necessary is taken in and the buried pipe body is damaged. It is possible to prevent cavities from forming around the 15.

On the other hand, when the main body 1 is excavated and the pipe body 15 is added, the screw conveyor 13 is stopped at a position where the lid body 14 closes the earth and sand intake port 12a.

As a result, a large amount of earth and sand naturally flows into the connecting pipe 12 from the earth and sand intake port 12a while the cutter head 10 is stopped.
Next, when the screw conveyor 13 is rotated, the possibility that the screw conveyor 13 stalls and becomes difficult to rotate can be prevented.

1. As described in detail above, this device is equipped with a screw conveyor near the earth and sand intake port that opens and closes the earth and sand intake port, and is equipped with a core and a pipe that restricts the inflow of excessive earth and sand when the main body is excavated. After burying the pipe body, it is possible to reliably prevent the formation of cavities around the pipe body that may cause ground erosion or scuttling of the pipe body.

In addition, when the cutter head is stopped, it closes from the earth and sand intake cap to prevent the lead pipe from being filled with sand. This prevents the screw conveyor from stalling and making it difficult to rotate the next time. Any risk of this happening can be prevented.

Furthermore, since it is only necessary to provide a lid on the screw conveyor near the earth and sand intake port, it can be implemented easily and at low cost.

[Brief explanation of drawings]

The drawings show one embodiment of this invention, with FIG. 1 being an overall sectional view and FIG. 2 being a sectional view taken along line 1--2 in FIG. 1. 1 is the main body, 10 is the cutter head, 11 is the cutter, 12a
13 is the screw conveyor, and 14 is the lid.

Claims (1)

[Scope of utility model registration request] A cutter head 10 is provided at the tip of the main body 1 connected via a connecting pipe 12 to the rear end of a lead pipe laid underground in advance, and the lead pipe is guided while rotating the cutter head 10. While digging underground, the earth and sand excavated by the cutter 11 provided on the cutter head 10 is transferred to the earth and sand intake port 12 opened on the upper outer peripheral surface of the connecting pipe 12.
In the case where the soil is taken into the leading pipe from a and carried out to the front of the main body 1 by the screw conveyor 13 in the leading pipe, the soil is located on the outer periphery of the screw conveyor 13, near the soil intake port 12a, and is The lid body 1 closes the earth and sand intake port 12a when stopped.
4 is attached to the excavation device for management facilities.