JPH10266185A - Method and device for injecting grout - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for infecting a grout, by which a vertical grout vein can be formed simply and surely in the fixed direction and the backflow of the grout can be prevented. SOLUTION: An injection pipe 1 with a plurality of discharge holes is installed, and a covering film 2 formed of an elastic body is mounted on the outside of the injection pipe 1. Vertical slitty discharge openings 6 are formed at places not conformed to the discharge holes of the injection pipe 1 in the covering film 2, lip sections 3 extended to the outside in the radial direction are formed oppositely while holding the vertical slitty discharge openings 6 in the covering film 2, the roots of the lip sections 3 are held by hold-down metal fittings 4, and a grout is discharged from sections among the opposed lip sections 3 through the discharge holes of the injection pipe 1 and the slitty discharge openings 6 of the covering film 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection pipe having a plurality of discharge holes, a coating film formed of an elastic material provided outside the injection pipe, and a vertical slit-shaped discharge film formed on the coating film. An outlet is provided at a position that does not coincide with the discharge hole of the injection pipe, and a filler is injected into the outside of the coating film by inserting the injection pipe into the ground,
The present invention relates to a grout injection method and apparatus for discharging grout from a vertical slit-shaped discharge port from inside an injection pipe.

[0002]

2. Description of the Related Art Conventionally, various grouting apparatuses have been proposed. For example, the present applicant has disclosed in Japanese Patent Application Laid-Open No. 7-286.
No. 319, in order to easily and surely form a vertical grout pulse in a predetermined direction, an injecting outer tube, an injecting inner tube having a discharge hole provided therein, and a rubber pipe provided outside the injecting outer tube. A grout injection method and apparatus in which a vertical slit is provided in a rubber pipe and the vertical slit is located at a position that does not coincide with a discharge hole is disclosed in the grout injection apparatus configured as above.

In FIG. 4, an elastic coating film 2A having a vertical slit 7 is provided outside the injection tube 1, and a metal band 8 is wound and held. As shown in FIGS. 3 and 5, the injection pipe 1 is provided with the discharge holes 5 in a staggered position that does not coincide with the slits 7.

[0004] When the injection pipe 1 is inserted into the ground and grout is injected from an inner pipe (not shown) in the injection pipe 1, the grout passes through the discharge hole 5 between the coating film 2A and the injection pipe 1. Is injected into the ground through the slit 7 to form grout veins.

Although this technique is effective, there is a problem that a part of the vertical slit may remain open after the injection, which causes a backflow of the grout.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a grout injection method and apparatus which can form a vertical grout pulse in a predetermined direction simply and more reliably and can prevent backflow of grout. The purpose is.

[0007]

According to the grout injection method of the present invention, an injection pipe having a plurality of discharge holes is provided, a coating film made of an elastic material is provided outside the injection pipe, and the coating is formed. A vertical slit-shaped discharge port is provided in the covering film at a position that does not coincide with the discharge hole of the injection pipe, the injection pipe is inserted into the ground to inject a filler outside the coating film, and grouting is performed from inside the injection pipe. In the grout injection method of discharging from the vertical slit-shaped discharge port, lip portions extending radially outward on both sides of the longitudinal slit-shaped discharge port of the coating film are provided facing each other,
The base of the lip is held by a holding metal, and the grout is discharged from between the opposing lips through the discharge hole of the injection pipe and the slit-shaped discharge port of the coating film.

Further, according to the grout injection apparatus of the present invention, an injection pipe having a plurality of discharge holes is provided, and a coating film made of an elastic body is provided outside the injection pipe, and the coating film is formed vertically. A slit-shaped discharge port is provided at a position that does not coincide with the discharge hole of the injection pipe, the injection pipe is inserted into the ground to inject the filler outside the coating film, and the grout is formed into a vertical slit from the injection pipe. In the grout injection device discharged from the discharge port,
A lip portion extending radially outward is provided on both sides of the vertical slit-shaped discharge port of the coating film so as to face each other, and the base of the lip portion is held by a holding metal fitting.

Therefore, according to the grout injection of the present invention, first, the injection pipe is inserted into the ground, the vertical slit-shaped discharge port is directed in the direction to be injected, and the surrounding area is filled with the filler and fixed. I do. Then, when grout is injected into the injection pipe, the grout enters between the injection pipe and the coating film from the discharge hole, is directed at the lip portion from the slit-shaped discharge port, penetrates the surrounding filler, and enters the ground. Injected to form vertical grout veins. When the injection is completed, the lip is closed by the external pressure, and backflow is prevented.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 and FIG.
Is provided with a coating film 2 formed of an elastic body outside the substrate. A slit-like discharge port 6 extending in the vertical direction is directed to a predetermined direction on the outer periphery of the coating film 2 (in the illustrated example, 1.
The two lip portions 3 are provided opposite to each other with the slit-shaped discharge port 6 interposed therebetween and extend outward in the radial direction.

On the other hand, as shown in FIG. 3, a plurality of discharge holes 5 are provided in the injection pipe 1 in a staggered manner so as not to coincide with the position of the slit-like discharge port 6 (indicated by a chain line L).

[0013] At the base of the lip 3, a holding member 4 extending in the axial direction is attached, and the lip 3 is held.

The procedure of the grout injection method will be described. First, a hole E into which the injection pipe 1 is inserted is excavated, and the injection pipe 1 covered with the coating film 2 is inserted. Then, the discharge port 6 is directed in the direction to be injected, and the outer peripheral portion of the injection pipe 1 is filled with the filler J and fixed. Next, when grout is injected from an inner pipe (not shown) in the injection pipe 1, the grout passes between the injection pipe 1 and the coating film 2 from the discharge hole 5 of the injection pipe 1, and has a slit-like shape of the coating film 2. It is discharged from the discharge port 6. At this time, it is directed at the lip portion 3, penetrates the filler J, is injected into the ground, and a vertical grout pulse is formed.

On the other hand, even if the injection is completed and the pressure in the injection pipe 1 is reduced, the lip portion 3 does not close due to the external pressure and does not flow backward.

[0015]

According to the present invention, as described above, the injection pipe inserted into the ground can be moved in a predetermined direction.
The vertical grout vein can be formed simply and more reliably, and the backflow of the grout can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an injection device of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a perspective view showing an injection tube.

FIG. 4 is a perspective view showing a conventional injection device.

FIG. 5 is a sectional view of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Injection pipe 2 ... Coating film 3 ... Lip part 4 ... Holder 5 ... Discharge hole 6, 7 ... Slit-like discharge port 8 ... Metal band

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[Procedure amendment]

[Submission date] May 27, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

According to the present invention, an injection pipe having a plurality of discharge holes is provided, and a coating film made of an elastic material is provided outside the injection pipe, and the coating film is formed vertically. A slit-shaped discharge port is provided at a position that does not coincide with the discharge hole of the injection pipe, the injection pipe is inserted into the ground, a filler is injected outside the coating film, and the injection pipe is fixed. In a grout injection method of discharging grout from a vertical slit-shaped discharge port, lip portions extending radially outward on both sides of the vertical slit-shaped discharge port of the coating film are provided to face each other, and the lip portion Hold the root with a holding metal, and discharge grout from the discharge hole of the injection pipe through the slit-shaped discharge port of the coating film from between the opposing lip parts, and the grout oriented at the lip part fills the filler. Penetrate, vertical grout veins are formed, Lip when input operation is completed is adapted to prevent backflow by closing in external pressure.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

Further, according to the present invention, an injection pipe having a plurality of discharge holes is provided, and a coating film formed of an elastic body is provided outside the injection pipe, and the coating film has a vertically slit-shaped discharge port. Is provided at a position that does not coincide with the discharge hole of the injection pipe, the injection pipe is inserted into the ground, a filler is injected outside the coating film, the injection pipe is fixed, and grout is vertically slit from the inside of the injection pipe. A grout injection device for discharging from a discharge port of the above, wherein lip portions extending radially outwardly are provided on both sides of the vertical slit-shaped discharge port of the coating film so as to face each other, and a holding metal fitting for holding the base of the lip portion Is provided.

Claims (2)

[Claims] An injection pipe having a plurality of discharge holes is provided, a coating film formed of an elastic body is provided outside the injection pipe, and a vertical slit-shaped discharge port is formed in the coating film. A grout injection method in which a filler is provided at a position not coinciding with the discharge hole, a filler is inserted into the ground by injecting a filler into the outside of the coating film, and grout is discharged from the vertical slit-shaped discharge port from within the filler pipe. A lip portion extending radially outward is provided on both sides of the coating film in such a manner as to face the longitudinal slit-shaped discharge port, and the base of the lip portion is held by a holding metal fitting, and grout is discharged from the discharge hole of the injection pipe. A grout injection method of discharging from between lip portions facing each other through a slit-shaped discharge port of the coating film. 2. An injection pipe having a plurality of discharge holes is provided, a coating film formed of an elastic body is provided outside the injection pipe, and a vertical slit-shaped discharge port is formed in the coating film. In a grout injection device that is provided at a position that does not coincide with the discharge hole, inserts an injection pipe into the ground to inject the filler outside the coating film, and discharges grout from the vertical slit-shaped discharge port from within the injection pipe. A grout injection apparatus characterized in that lip portions extending radially outward are provided on both sides of the coating film in such a manner as to face each other with a vertically slit-shaped discharge port therebetween, and a base of the lip portion is held by a holding metal fitting.