JPS5834639B2 - Mouth device for pressurized digging - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressurized excavation mouth device such as an excavator for pressurized excavation in an inclined or horizontal direction.

In this type of pressurized excavation mouth device, the mouth pipe is inserted and fixed at the entrance of the excavation hole by cementing, the casing pipe is inserted into this, and the casing pipe and the mouth pipe are kept liquid-tight. C. The wastewater discharged through the casing pipe leaks from between the two.

Therefore, the liquid tightness between the mouth pipe and the casing pipe is ensured, but as the excavation progresses, casing pipes with smaller diameters must be successively inserted.

At this time, it is necessary to move the excavator and prepentor to establish a liquid-tight connection between the casing pipes.

The present invention aims to provide a pressurized drilling mouth device that is configured to reduce the pipe diameter as the digging depth progresses, maintain liquid tightness at the mouth portion without moving the prepenter of the drilling machine. It is something to do.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

As shown in the figure, reference numeral 1 is a mouth device equipped with a gate pulp 2, and a position adjustment pipe 3 is attached to the tip of the mouth device, and a button is attached to the tip.
An excavator main body 5 is provided at the rear end via a prepentor 4, and the excavator main body 5 has a drive cylinder 7 that slides in the axial direction and rotational direction within an outer cylinder 6. The drill pipe 10 is rotated by a motor 8, and a liquid-tight chuck 9 provided at the rear of the drive cylinder 7 rotates the drill pipe 10.

A drill bit 11 is attached to the tip of the drill pipe 10, and a core container 13 is connected to the rear end via a gate pulp 12, and the core container 13 pressurizes slurry via a water swivel 14. It is communicated with tank 15.

The overflow pipe of the pressurized tank 15 is connected to the slime separation tank 16 and further to the water pump 17.
is communicated with.

A mouth pipe 33 is fitted into the excavated hole 18 into which the drill pipe 10 is inserted by cementing 19, and a flange 20 is provided at the outer end of the mouth pipe 33.

The flange 21 is attached to the flange 20 in a liquid-tight manner,
It is fixed to the outer end of the outermost casing pipe 22.

A casing shoe 2 is provided at the inner end of the casing pipe 22.
3 is installed.

Then, the next casing pipe 24 is introduced into the casing pipe 22 at a stage where the excavation has further progressed.
A flange 25 provided there is welded to the flange 21.

The neck portion of a flange 27 having a short neck portion 26 is fitted into this flange 25 in a fluid-tight manner.

The flange 28 joined to the flange 27 is slidably fitted into the position adjustment pipe 3 in a fluid-tight manner.

In this way, insert the casing pipe 29°3 inside one by one.
As the 7 flange 28 is inserted and inserted, the 7 flange 28 is joined via the flanges 31 and 32 as shown in FIG.

In this case, the position adjustment pipe 3 is cut and shortened little by little.

Therefore, it is possible to sequentially connect the casing pipes 24, 29, . . . without moving the mouth device, Noah's IJ penta, the excavator body, etc.

Therefore, the button on the mouth device has the effect of sufficiently maintaining the liquid tightness of the mouth region.

In other words, in horizontal or inclined excavation work in soft and collapsible strata, pressurized excavation that applies pressure equivalent to muddy water during vertical excavation is effective, and in this case, the present invention is effective. is particularly effective.

In the above embodiments, the case of horizontal excavation was described, but it goes without saying that the mouth device of the present invention can also be applied to the case of inclined excavation.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an embodiment of the present invention, FIG. 2 is a tangent, and FIG. 4 is a longitudinal sectional side view showing the structure of the mouth device. 1... Mouth device, 2... Gate pulp, 3... Position adjustment pipe, 4... Prepenta, 5... Drilling machine Main body, 6...
Outer cylinder, 7... Drive cylinder, 8... Motor,
9...Liquidtight chuck, 10...Drill pipe, 11...Drill bit, 12...
・・Gate pulp, 13・・・・Core container
14... Swivel, 15... Pressurized tank, 16... Slime separation tank, 17...
...Water pump, 18...Drilling hole, 19...
... Cementing, 20 ... Flange, 2
1...Flange, 22...Casing pipe, 23...Casing shoe 24...
...Casing pipe, 25...Flange, 26...Neck, 27...Flange,
28...Flange, 29,30...Casing pipe, 31,32...Flange, 3
3... Mouth pipe, 34... Taper ring.

Claims (1)

[Claims] 1. In a drilling machine that performs pressurized excavation in an inclined or horizontal direction, a casing pipe is inserted into the mouth pipe that has been inserted and fixed by cementing into the borehole, and the flange part of the casing pipe and the flange at the mouth of the mouth pipe are A position where a sliding flange is provided on the main gate valve, which is fluid-tightly joined to the casing pipe or a flange provided at the base end of the casing pipe that is successively fitted into the casing pipe. A mouth device for pressurized excavation, which is fluid-tightly fitted into an adjustment pipe, and whose length is shortened by cutting the position adjustment pipe as the number of stages of fitting and insertion of the casing pipe increases.