JPH1082044A - Sleeve valve for grouting pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a back flow after the election of a grout, and to generate cracks in the horizontal direction surely without vertically expanding the jet of the grout by extending the opposed end sections of upper-lower two elastic sleeves to the outside in the radial direction respectively and forming lip sections. SOLUTION: Lip sections 12, 12 elongated to the outside in the radial direction are formed oppositely to elastic sleeves 11, 11 for a sleeve valve. Consequently, parallel surface sections D1 by the lip sections 12, 12 are formed to a nozzle D pushed open by a grout C and formed at the time of grout injection. Accordingly, the grout C is guided by the parallel surface sections D1 at the time of grout injection, and ejected as a jet E in the horizontal direction under the state of an approximately laminar flow. Cracks in the horizontal direction are generated surely in a ground by the jet E, and the effect of grout injection is improved. Pressure is applied to the upper and lower surfaces of the lip sections 12, 12 after grout injection, and the parallel surface sections D1 are fast stuck and a back flow is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve valve for a grout injection pipe for improving the ground by ejecting an injection material from a gap between two upper and lower elastic sleeves provided outside the grout injection pipe.

[0002]

2. Description of the Related Art An example of a conventional sleeve valve will be described with reference to FIG. Outside the injection pipe 1 suspended in the borehole A, a sleeve valve 2 having two upper and lower elastic sleeves 3 is fixed by stoppers 4.

[0003] As shown in FIG. 4, the injection pipe 1 thus constructed is inserted into a boring hole A filled with a filler B, and the injection material, ie, grout is injected into the injection pipe 1 by means not shown. As shown in FIG. 6, the grout C passes through the discharge port 5 of the injection pipe 1, and is ejected radially outward, that is, horizontally, from an ejection port D formed by pushing and expanding the elastic sleeves 3. As a result, a horizontal crack F is generated in the ground as shown in FIG. 4 and the grout penetrates, and the ground is improved by the grout.

[0004] However, in the ejection port D in which the ends of the elastic sleeves 3 and 3 are opposed to each other, there is a problem that the valve closing after the ejection of the injection material is incomplete and a backflow occurs due to external pressure.

Further, since the ends 3a, 3a forming the ejection ports of the elastic sleeves 3, 3 open at a certain angle at the time of ejection, the jet E of the grout C tends to spread in the vertical direction. As shown in (1), there is also a problem that a vertical crack F1 occurs and the injection effect is reduced.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a grout which does not cause a backflow after the injection material is ejected, and which can be injected by generating cracks in the horizontal direction without causing the jet of the grout to expand in the vertical direction. It is intended to provide an injection tube sleeve valve.

[0007]

According to the sleeve valve of the grout injection pipe of the present invention, the injection material is ejected from the gap between the upper and lower two elastic sleeves provided outside the grout injection pipe to form the ground. In the improved grout injection tube sleeve valve, the opposite ends of the upper and lower two elastic sleeves are each extended radially outward, and a lip is formed to form a check valve.

The radial length of the lip portion is, for example, 10 m when the outer diameter of the elastic sleeve of the injection tube inserted into a boring hole having a hole diameter of 86 mm is, for example, 60 mm.
m.

In the sleeve valve of the grout injection pipe configured as described above, the opposite ends of the upper and lower elastic sleeves are extended in the radial direction to form a lip portion, and after the injection material is ejected, the lip portion is formed. Does not open in close contact, and backflow is prevented. On the other hand, the lip portion forms a horizontal ejection port which is relatively long in the radial direction, and the injection material is guided by the lip portion and is reliably ejected in the horizontal direction without spreading in the vertical direction.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, lip portions 12, 12 extending outward in the radial direction are formed on the elastic sleeves 11, 11 of the sleeve valve 10 so as to face each other. The radial length L of the lip portion 12 is, for example, 10 mm when the outer diameter d of the elastic sleeve 11 of the injection tube 1 inserted into the boring hole A having a hole diameter D of 86 mm is, for example, 60 mm. Therefore, as shown in FIG. 3, lip portions 12, 12 are provided at the ejection port D formed by being expanded by grout C during grout injection.
Thereby, relatively long parallel plane portions D1, D1 are formed.

At the time of grout injection, grout C
Is guided by the parallel plane portions D1 and D1, and is ejected as a substantially laminar horizontal jet E. By this jet E, as shown in FIG. 4, a horizontal crack F is reliably generated in the ground, and the effect of grout injection is improved.

On the other hand, after the grout is injected, the lip 1
Pressure is applied to the upper and lower surfaces of 2, 2 and the parallel surface portions D1, D
1 is in close contact and the backflow is prevented.

[0013]

According to the present invention, as described above, the lip portion formed by extending the opposite ends of the upper and lower elastic sleeves in the radial direction can be used after the injection material is ejected. The lip portion can prevent backflow without opening tightly. And since this lip part forms a horizontal spout that is relatively long in the radial direction,
The injected material is guided by the lip portion, so that the spread in the vertical direction is suppressed, and the injected material can be reliably ejected in the horizontal direction to generate cracks.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a side sectional view showing a main part of FIG. 1;

FIG. 3 is a sectional view showing a main part shown in FIG. 2 when grout is injected;

FIG. 4 is a side sectional view showing a state in which cracks are generated.

FIG. 5 is a diagram corresponding to FIG. 1 of a conventional product.

FIG. 6 is a diagram corresponding to FIG. 3 of a conventional product.

FIG. 7 is a diagram corresponding to FIG. 4 of a conventional product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Injection pipe 2, 10 ... Sleeve valve 3, 11 ... Elastic sleeve 4 ... Stopper 5 ... Discharge port 12 ... Lip part A ... Boring hole B ... Filling material C: Grout D: Spout

Claims (1)

[Claims] 1. A grout injection pipe sleeve valve for improving a ground by ejecting an injection material from a gap between two upper and lower elastic sleeves provided outside a grout injection pipe, wherein the two upper and lower elastic sleeves are provided. Characterized in that the opposite ends of the sleeves extend radially outwardly and form a lip to form a check valve.