JPH0342108Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a tube suitable for use in, for example, a chemical injection device for civil engineering of a type in which the liquid injection tube is self-propelled.

[Conventional technology]

In civil engineering works such as tunnels and building construction, when the ground is soft, in order to prevent accidents such as cave-ins and to make excavation work easier, it is necessary to Normally, a hardening agent is injected and the ground is hardened before excavation work is carried out.In the past, various difficulties have been pointed out with this chemical injection work, but recently, The inventor of the present invention has developed a chemical injection device for civil engineering that eliminates all the conventional difficulties, and has already applied for a patent.

That is, as shown in FIG. 1, this device consists of a guide tube A having a flange-like head H or fins F at one end, and a chemical injection tube C having one end sealed S.
The ground G where the chemical solution is to be injected is fixed.
Insert the casing pipe into the borehole B formed in
By inserting the tube through Cs and sealing it using the packer P, and pressurizing the chemical liquid from the rear end of the guide tube A, the chemical liquid injection tube C will expand due to the pressure and move by itself within the borehole B, resulting in the final In this case, the pressure inside the tube C increases and parts such as the seal S are ruptured, so that the chemical solution is injected deep into the borehole B and into cracks and soft ground.

However, after repeated experiments on the above device, we found that when the injection pressure of the drug is high, the drug solution injection tube C expands greatly in the circumferential direction (or radial direction), comes into close contact with the inner wall of the borehole B, and automatically closes. It has been discovered that there is a possibility that an accident may occur where the train stops running.

[Means to solve the problem]

The present invention was developed against the background of the above-mentioned circumstances for the purpose of providing a tube for use in a chemical injection device for civil engineering that prevents extreme expansion in the radial direction when self-propelled. In a tube of a chemical liquid injection device for civil engineering, the tube is fitted and fixed in a substantially folded shape to a guide tube provided with a flange-like head, and is expanded by the pressure of the liquid press-fitted into the guide tube. The tube is characterized by having a protrusion extending along the circumferential direction of the tube on the inner or outer surface of the tube.

[Effect]

In the tube of the present invention, the protrusions provided in the circumferential direction of the tube adequately resist the internal pressure that increases due to the injection of the chemical solution, so that the tube does not expand greatly in the radial direction and come into close contact with the inner wall of the borehole.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

The tube body 1a shown in FIG. 2 has an appropriate length and is made of relatively soft plastic.
A rib-shaped protrusion 2a is formed in the circumferential direction on the outer surface of the
This is an example of a tube of the present invention in which rib-like protrusions 2a are protruded at appropriate intervals, and the width and spacing of the rib-like protrusions 2a may be determined depending on the strength of the main body 1a and the injection pressure of the chemical solution. An example of the tube of the present invention configured in this way is
This is folded into a roughly bellows shape in the longitudinal direction, fitted and fixed in the guide tube A as described above, and then set in the borehole B. If the chemical solution is press-fitted from the rear end of the guide tube A, the radial direction can be adjusted. It is similar to the conventional product that it expands while being inhibited from expanding and moves by itself in contact with the inner wall of the borehole B, but the rib-shaped protrusions 2a provided in the circumferential direction increase the pressure inside. Since it has just the right amount of resistance, it will not expand greatly in the radial direction and come into close contact with the inner wall of the borehole B, thereby stopping its self-propelled movement. In addition, the parts other than the rib-shaped protrusions 2a remain soft plastic, and if a crack or the like occurs in the middle of the borehole B, only that part expands and ruptures, and the chemical solution is injected into the crack or the like. The effect of conventional products is not impaired in any way.

In the present invention, the rib-shaped protruding strips 2a may be provided protrudingly on the inner surface of the main body 1a, or may be provided continuously in a spiral shape on the outer or inner surface of the main body 1a, or even on one main body 1a. On the other hand, the protrusions may be provided on the circumference along the longitudinal direction of the outer surface, and may be appropriately spaced apart from each other in the circumferential direction of the inner surface, or may be provided continuously and protrudingly in a spiral shape. In particular, tubes with protrusions along the length direction on the outer surface and circumferential protrusions on the inner surface are designed so that the protrusions on the outer surface promote smooth running, and the protrusions on the inner surface promote smooth running. It also has the effect of suppressing directional expansion.

Therefore, in addition to the device shown in FIG. 1, the inventor of the present invention also designed a guide tube similar to that used in the device shown in FIG. We have completed the development of a device that can be fixed and inject drugs made of multiple components.
The tube of the present invention can be effectively used in such a chemical liquid injection device having multiple channels.

That is, what is shown in FIG. 3 is an example of an outer tube that is externally wrapped around the tube of the present invention and is used to form a tube having a plurality of channels inside.

The tube shown in FIG. 3 has a main body 1b of an appropriate length made of relatively soft plastic similar to the tube of the present invention shown in FIG.
A protrusion 2b along the longitudinal direction of the tube on its outer surface
It is provided with an appropriate number of tubes, and is folded into a roughly bellows shape in the longitudinal direction along with the tube of the present invention.

FIG. 4 shows the outer tube 3 shown in FIG. 3 being wrapped around the inner tube 4 of the present invention shown in FIG. 2 to form a plurality of channels.

The tube having multiple flow paths configured as shown in FIG. 4 not only can inject a chemical solution made of multiple components, but also the protrusion 2b in the length direction of the outer tube 3 reduces frictional force during self-propulsion. Rib-shaped protrusions 2a provided in the circumferential direction of the inner tube 4
As a result of suppressing the radial expansion of the tube 4, it is possible to more effectively prevent the tube traveling from coming into close contact with the inner wall of the borehole B and stopping.

Moreover, in tubes with multiple flow paths as described above, the tubes come into close contact with each other, making it difficult to pressurize the chemical solution into the outer flow paths. By using the invented tube with directional protrusions on the inner tube,
In addition to being able to solve such problems, as shown in FIG.
Alternatively, the problem can also be solved by providing similar protrusions 2d on the inner surface of the outer tube 3, as shown in FIG. Although not shown, the same problem can also be solved by providing a spiral or annular protrusion on the outer surface of the inner tube 4 or the inner surface of the outer tube 3.

In the above embodiments, a tube with a double structure using the tube of the present invention was described, but the tube of the present invention can also be applied to a tube with a triple structure or more.

[Effect of idea]

Since the present invention is as described above, it can be used as a tube for use in a device such as a chemical injection device for civil engineering, which presses fluid into a guide tube and uses the pressure to extend and advance the tube. It is extremely practical because it can suppress expansion.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of an example of a device using the tube of the present invention, Fig. 2 is a side view of an example of the tube of the present invention, Fig. 3 is a side view of an outer tube mounted on the tube of the present invention, and Fig. 4 is a side view of an example of the device using the tube of the present invention. A partially cutaway side view of the tube of the present invention with the tube shown in FIG. 3 exteriorized, and FIGS. 5 and 6 are sectional views of other examples of FIG. 4. 1a, 1b...main body, 2a...rib-shaped protrusion,
2b, 2c, 2d...Protruding stripes, 3...Outer tube, 4...Inner tube.

Claims (1)

[Claims for Utility Model Registration] 1. A chemical solution for civil engineering that is fitted and fixed in a substantially folded shape into a guide tube with a flange-shaped head at one end and expanded by the pressure of the liquid press-fitted into the guide tube. 1. A tube for use in a chemical liquid injection device for civil engineering, characterized in that the tube of the injection device is provided with a protrusion along the circumferential direction of the tube on the inner or outer surface of the tube. 2. The tube according to claim 1 of the utility model registration claim, wherein the protrusions are provided at appropriate intervals along the circumferential direction of the inner or outer surface of the tube. 3. The tube according to claim 1 of the utility model registration claim, wherein the protruding strip is spirally protruded in the circumferential direction of the inner or outer surface of the tube.