JP2508330Y2 - Fluid ejection device of small diameter pipe underground propulsion machine - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is directed to a fluid ejecting apparatus for a small-diameter pipe underground propulsion machine configured to eject a fluid in order to prevent clogging of the interior of the pipe by clayey sand. Regarding

(Prior Art) When embedding a small-diameter pipe used for water and sewage, electricity, gas, etc. in the ground by a conventional small-diameter pipe underground propulsion machine, attach a direction controllable front conduit to the tip of the small-diameter pipe. The small-diameter pipe is propelled into the ground by the propulsion device installed in the starting shaft.

A cutter head that is rotated by a drive source is provided at the tip of the leading conduit. Sediment excavated by the cutter head is installed in the leading conduit and the small diameter pipe after being taken into the leading conduit. It is designed to be discharged to the starting shaft by the screw conveyor.

(Problems to be solved by the invention) In the above-mentioned conventional small-diameter pipe underground propulsion machine, when the underground geology for embedding the small-diameter pipe is clay, the earth and sand taken into the screw conveyor adheres to the inner surface of the pipe. Then, there was a problem that the pipe was blocked and it became difficult to discharge the sediment.

The present invention has been made for the purpose of improving the above problems, and an object of the present invention is to provide a fluid ejecting device for a small-diameter pipe underground burying machine that ejects a fluid to excavated earth and sand to reduce its viscosity to facilitate discharge. It is also possible.

(Means and Actions for Solving the Problem) (1) This invention is a small-diameter pipe having a tip conduit attached to the tip end thereof is propelled into the ground by a propulsion device installed in a starting shaft, and is provided at the tip end of the tip conduit. The soil excavated by the cutter head is discharged by the screw conveyor installed in the front conduit and the small diameter pipe, and the shaft of the screw conveyor is formed by the pipe body to inject the fluid into the shaft from the starting shaft side. In a small-diameter pipe underground propulsion machine in which a nozzle and an ejection pipe for ejecting a fluid toward the inside of the cutter head and toward the face are provided at the end of the shaft on the side of the cutter head, earth and sand are attached to the tip of the nozzle and the ejection pipe. An elastic body that prevents the reverse flow of sewage and dirty water and an elastic body that has slits in the cross direction,
A check valve is provided on the back side of the check plate, which is composed of a prevention plate having a plurality of through holes for preventing the elastic plate from being deformed inward by earth pressure.

As a result, even if earth and sand or muddy water flows backward from the front face of the cutter head into the ejection pipe and tries to push open the elastic plate, the prevention plate serves as a stopper, so that intrusion of earth and sand or muddy water can be prevented.

(2) Further, in this invention, a protector is provided on the front surface of the cutter head in a state of straddling the passage of the liquid ejected from the tip of the ejection pipe, whereby rocks or the like collide with the check valve at the tip of the ejection pipe and are damaged. Prevent from doing.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall view of a small-diameter pipe underground propulsion machine, in which a propulsion device 4 operated by hydraulic pressure supplied through a hydraulic unit 2 and a control unit 3 is installed in a starting shaft 1 and this propulsion device 4, a small-diameter pipe 6 such as a fume pipe having a tip conduit 5 attached to its tip is propelled toward the reaching shaft 7.

As shown in FIG. 2, the front conduit 5 has a cutter head 8 rotatably provided at the front portion thereof.
A plurality of disc cutters 9 are attached to the disc, and as the small-diameter pipe 6 is propelled, the face faces of the front conduit 5 are excavated by the disc cutters 9 and the excavated earth and sand are provided in the front conduit 5. It is designed to be taken into the screw conveyor 10.

The screw conveyor 10 is composed of a tubular casing 10a and a screw 10 housed in the casing 10a. The tip of the shaft 10c of the screw 10b is connected to the cutter head 8, and the cutter head 8 is rotated by the rotation of the screw 10. While being rotated, the casing 10a and the screw 10b of the screw conveyor 10 are formed to have the same length as the length of the small diameter pipe 6, and every time the small diameter pipe 6 is added, the casing 10a and the screw 10b are also added. It is supposed to be.

On the other hand, the earth and sand taken into the screw conveyor 10 is conveyed rearward in the casing 10a as the screw 10b rotates, but the inside of the casing 10a in the front conduit 5 expands due to the pressure of air or the like and the inside of the casing 10a expands. A pinch valve 12 that closes the valve is provided.

A drive mechanism 13 for driving the screw 10b of the screw conveyor 10 is installed in the starting shaft 1.

The drive mechanism 13 is a screw 10b as shown in FIG.
It has a drive shaft 13a connectable to the shaft 10c.

The drive shaft 13a is connected to a drive motor 15 via a chain 14, and the drive motor 15 rotates the screw 10b via the drive shaft 13a.

On the other hand, the shaft 10c of the screw conveyor 10 is formed by a tubular body, and the end on the side of the starting shaft 1 has a passage 13b provided in the drive shaft 13a and a rotary joint 16 provided at the end of the drive shaft 13a. It is connected to a fluid supply pipe 17 through which a fluid such as water mixed with mud water is injected into the shaft 10c from the fluid supply pipe 17.

This fluid reaches the cutter head 8 through the shaft 10c,
A plurality of nozzles 18 provided on the outer peripheral portion of the shaft 10c in the cutter head 8 into the cutter head 8 and then the shaft 10c.
From the tip of the ejection pipe 19 connected to the tip of the cutter head 8
It is designed to be ejected in front of each.

As shown in FIG. 5, the nozzle 18 is attachable to and detachable from the shaft 10c, and a cylindrical head 18a has jet ports 18b opened in four directions.

An elastic seal 18c for preventing the intrusion of earth and sand is attached to each of these ejection ports 18b, and these seals 18c are designed to expand due to the pressure of the fluid supplied to the nozzle 18. Are ejected into the cutter head 8.

A check valve 20 is provided at the tip of the ejection pipe 19 as shown in FIGS. 6 and 7.

The check valve 20 is provided with an elastic plate 20b having slits 20a in the cross direction and an elastic plate 20b provided behind the elastic plate 20b by earth pressure.
Support plate 20c and ring 20d that prevent the inner side from being deformed
The support plate 20c has a plurality of through holes 20e.

The fluid ejected from the through holes 20e pushes the elastic plate 20b open and ejects forward, and a protector 21 is attached to the front face of the cutter head 8 to prevent earth pressure from being directly applied to the check valve 20. Has been.

Next, the operation will be described. As the small-diameter pipe 6 is propelled into the ground by the propulsion device 4 installed in the starting shaft 1, the cutter head 8 provided at the tip removes the sediment in front of the leading conduit 5. Excavate and take in the screw conveyor 10.

The earth and sand taken into the screw conveyor 10 is carried out rearward in the casing 10a as the screw 10b rotates.
It is discharged from the starting shaft 1 to the ground, but if the earth and sand to be excavated is clay, the fluid supply pipe 17 causes the screw 10b shaft 10c.
Supply fluid into the interior.

This fluid reaches the cutter head 8 through the shaft 10c,
The viscosity of the earth and sand ejected from the nozzle 18 into the cutter head 8 and taken into the cutter head 8 is lowered, and a part of the earth and sand is also ejected from the ejection pipe 19 to the face in front of the cutter head 8.

Thus, even if the excavated earth and sand is clay-like, it does not adhere to the inner surface of the casing 10a and block the inside of the casing 10a, so that the earth and sand can be discharged smoothly.

Also, if the underground geology where the small-diameter pipe 6 is buried is an aquifer, unnecessary amount of earth and sand will be taken up and a cavity will occur, causing ground subsidence. In such a case, remove the nozzle 18 and remove this portion. A blind plug is provided, and the fluid mixed with the sludge material is ejected from the ejection pipe 19 toward the face, and the inside of the casing 10a is closed by the pinch valve 12.

As a result, the inside of the casing 10a in front of the pinch valve 12 and the inside of the cutter head 8 are maintained at a high pressure, so that it is possible to propel the small diameter pipe 6 while preventing the face from collapsing.

(Effect of the Invention) As described in detail above, the present invention prevents the fluid from jetting from the shaft hole of the screw conveyor to the cutter head and the face, and prevents the backflow of the jet nozzle and the jet pipe such as an elastic seal check valve. By providing a pinch valve in the screw conveyor casing, the injection pipe can prevent the soil from being discharged, and the jetting of the fluid of the cutting face and the piny valve can block the inside of the screw conveyor. It contributes to prevent the collapse of the face due to the spring water caused by the increase in internal pressure.

Therefore, according to this invention, when the geology of the ground where the small-diameter pipe is buried is clay, the fluid is ejected to the excavated earth and sand to reduce the viscosity, so that the earth and sand adhere to the inner surface of the casing of the screw conveyor. Since this is not blocked, the excavated soil can be discharged smoothly.

Also, if the geology is likely to collapse like an aquifer, you can prevent the collapse of the face and the sediment transport phenomenon by mixing and ejecting the sludge material into the fluid. It can be prevented.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a general view of a small diameter pipe underground propulsion machine, Fig. 2 is a sectional view of a leading conduit, Fig. 3 is a sectional view of a drive mechanism, and Fig. 4 is FIG. 5 is an enlarged sectional view of the cutter head, FIG. 5 is an enlarged sectional view of the nozzle, FIG. 6 is an enlarged sectional view of the check valve, and FIG. 7 is an exploded perspective view of the same. 1 ... Starting shaft, 4 ... Propulsion device, 5 ... Front conduit, 6 ...
… Small diameter pipe, 8 …… Cutter head, 10 …… Screw conveyor, 10a …… Casing, 10c …… Shaft, 12 …… Pinch valve, 18 …… Nozzle, 18c …… Elastic seal, 19 …… Spout pipe, 20 …… Check valve.

Claims (2)

(57) [Scope of utility model registration request] 1. A small-diameter pipe (6) having a tip conduit (5) attached to its tip is propelled into the ground by a propulsion device (4) arranged in a starting shaft (1), and the tip conduit (5) A screw conveyor (1) in which earth and sand excavated by a cutter head (8) provided at the tip is placed in a tip conduit (5) and a small diameter tube (6).
0) and the screw conveyor (1
The shaft (10c) of (0) is formed from a tubular body, and the fluid is injected into the shaft (10c) from the side of the starting shaft (1).
Nozzle (18) for ejecting fluid toward the inside of the cutter head (8) and the cutting face is provided at the end of the cutter head (8) of (0c).
In a small diameter underground propulsion machine provided with a jet pipe (19), an elastic seal (18c) for preventing backflow of earth and sand and dirty water at the tip of the nozzle (18) and the jet pipe (19) and a crosswise direction. An elastic plate (20b) having a slit (20a) and a prevention plate provided on the back side thereof and having a plurality of through holes (20e) for preventing the elastic plate (20b) from being deformed inward by earth pressure. A fluid ejection device for a small diameter pipe underground propulsion machine, comprising a check valve (20) composed of (20c). 2. A small diameter pipe underground burying machine according to claim 2, wherein a protector (21) is provided on the front surface of the cutter head (8) in a state of straddling the passage of the fluid ejected from the tip of the ejection pipe (19). Fluid ejector.