JPH0340907Y2 - - 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 work such as tunnel and building construction, if the ground is soft, it is necessary to harden it over time before starting work to prevent accidents such as cave-ins and to make excavation work easier. It is common practice to inject a chemical that has the property of hardening the ground before excavation work is carried out, and various difficulties have been pointed out in the past with this chemical injection work, but recently the present invention has been proposed. A chemical injection device for civil engineering has been developed by the inventor of , which eliminates all the drawbacks of conventional methods, and a patent application has already been filed.

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
When inserted through Cs and sealed using a packer P, and pressurizing the chemical liquid from the rear end of the guide tube A, the chemical liquid injection tube C expands due to the pressure and moves by itself within the borehole B, and the final In this case, the pressure inside the tube C increases and the seal S breaks, thereby injecting the chemical deep into the borehole B and into cracks and soft ground.

However, after repeated experiments on the above device, it was found that the inner wall of the borehole B was extremely uneven except for the part where the casing pipe Cs was inserted, and the chemical liquid injection tube C could smoothly extend and move on its own due to the frictional force. It was found that in some cases, the material could get caught or break during elongation.

[Means to solve the problem]

The present invention was developed against the background of the above-mentioned circumstances, with the purpose of providing a tube for use in a chemical injection device for civil engineering that reduces the frictional force when self-propelled. In a tube of a chemical injection device for civil engineering, which is fitted and fixed in a substantially folded shape into a guide tube provided with a head and expanded by the pressure of the fluid pressurized into the guide tube, at least the outer surface of the tube is It is characterized by providing an appropriate number of protrusions along the longitudinal direction of the tube.

[Effect]

The tube of the present invention can extend and run smoothly even in a severely uneven borehole by reducing the frictional force during self-propulsion due to the protrusions provided along the longitudinal direction of the outer surface of the tube.

〔Example〕

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

The one shown in FIG. 2 has a main body 1a of an appropriate length made of relatively soft plastic.
This is an example of the tube of the present invention in which a large number of thin protrusions 2a are provided along the longitudinal direction, and for example, grooves corresponding to the protrusions are carved on the inner surface of the die during extrusion molding. It can be easily obtained by

Therefore, the above-mentioned example of the tube of the present invention is folded into a generally bellows shape in the longitudinal direction, and after being fitted and fixed in the guide tube A as described above, is set in the bore hole B, and after the guide tube A is folded. If a chemical solution is injected from the end, it will expand and move on its own within the borehole B while contacting its inner wall, which is the same as the conventional product.
Since the outer surface is provided with a large number of thin protrusions 2a along the longitudinal direction, the area of the contact surface is extremely small, and of course it is difficult to contact with the casing pipe Cs.
The frictional force against the inner wall of borehole B is drastically reduced,
It has the effect of being able to extend and run smoothly even in the severely uneven borehole B, and to inject the chemical into the desired ground B.

In addition, for the main body 1a provided with the protruding stripes 2a on the outer surface,
A large number of protrusions may be provided along the longitudinal direction of the inner surface, or may be provided at appropriate intervals in the circumferential direction of the inner surface, or may be provided continuously in a spiral shape. In particular, the circumferential protrusions have the effect of inhibiting the tube of the present invention from expanding in the radial direction.

In addition to the device shown in Fig. 1, the inventor of the present invention also installed a chemical injection tube with a plurality of fluid flow channels formed inside the same guide tube as that used in the device. Although the development of a device that enables the injection of drugs made of multiple components has been completed,
The tube of the present invention can also be used in such devices.

That is, the tube shown in FIG. 3 is an insertion tube that is inserted into the tube of the present invention shown in FIG. The main body 1b is made of soft plastic and has a suitable length. Rib-like protrusions 3a are provided on the outer surface of the main body 1b at suitable intervals in the circumferential direction, and are longitudinally aligned with the tube of the present invention. Folded into a bellows shape. This rib-shaped protrusion 3
The width and interval of a may be determined depending on the strength of the main body 1b and the injection pressure of the chemical solution.

The rib-shaped protrusions 3a may be provided protrudingly on the inner surface of the main body 1b, or may be provided continuously in a spiral shape on the outer or inner surface of the main body 1b.

4, the inner tube 5 shown in FIG. 3 is inserted into the outer tube 4 of the present invention shown in FIG. 2 to form a plurality of channels. It is something.

The tube configured in this way not only can inject drugs made of a plurality of components, but also reduces the frictional force when the protrusion 2a of the outer tube moves on its own, as described above, and the inner protrusion 3a
It is possible to prevent the outer tubes from coming into close contact with each other, and also to suppress the radial expansion of the inner tube, thereby preventing the outer tube from coming into close contact with the inner wall of the borehole B and becoming easily stopped.

On the other hand, the tubes for forming the plurality of flow channels are in close contact with each other, and it may be difficult to pressurize the chemical liquid into the outer flow channels. By providing a large number of thin protrusions 2b along the longitudinal direction on the outside of the inner tube 5, or by providing similar protrusions 2c on the inner surface of the outer tube 4 as shown in FIG. It may also be possible to prevent them from coming into close contact with each other. Although not shown, spiral protrusions may be provided on the outer surface of the inner tube 5 or the inner surface of the outer tube 4 to prevent the tubes from coming into close contact with each other and from expanding in the radial direction.

Although the embodiments shown in FIGS. 5 and 6 have been described with respect to a tube with a double structure, the present invention is not limited thereto, and can also be applied to a tube with a triple structure or more.

[Effect of idea]

As described above, the present invention is extremely practical as a tube for use in a device such as a chemical injection device for civil engineering, which injects fluid into a guide tube and uses the pressure to extend and move the tube forward.

[Brief explanation of drawings]

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 example of a tube inserted into the tube of the present invention, and FIG. The figure is a partially cutaway side view of the tube of the present invention in which the tube shown in Figure 3 is inserted;
5 and 6 are cross-sectional views of the outer and inner tubes forming a plurality of flow passages inside the tube of the present invention. 1a, 1b...Main body, 2a, 2b, 2c...Protruding stripes, 3a...Rib-shaped protruding stripes, 4...Outer tube, 5...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 a fluid pressurized into the guide tube. 1. A tube for use in a chemical liquid injection device for civil engineering, characterized in that the tube is provided with an appropriate number of grooves along the longitudinal direction of the tube on at least the outer surface of the tube. 2. The tube according to claim 1, which is a registered utility model, wherein the tube has one or more tubes extending in the same manner as the tube, and a plurality of flow paths are formed inside the tube. 3 Utility model registration claim 2, in which an appropriate number of grooves are provided along the longitudinal direction of the tube on at least one of the inner surface of the outer tube and the outer surface of the inner tube that form a flow path inside the tube. The tube described in section.