JP2000356044A - Injection nozzle for repair material for concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection nozzle that can smoothly inject repair material into cracks without leakage of the repair material during injection. SOLUTION: This nozzle has a cap body 26 made of an elastic material and fitted into the end of a nozzle pipe 12, the cap body 26 having a narrow, linear opening 26a in its end. The opening gets broader toward the rear end of the cap body so that at the rear end it serves as a circular opening 26b with a diameter about equal to or slightly smaller than the outside diameter of the cap body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates generally to injection nozzles. More specifically, the present invention relates to an injection nozzle for a repair material for a concrete structure.

[0002]

2. Description of the Related Art In order to repair a crack generated in a concrete structure, a method of injecting a repair material such as cement milk into the crack is known. In this method, after making a hole in the crack part, inserting the injection nozzle into this hole,
The crack is repaired by injecting the repair material into the crack through the injection nozzle. Conventional injection nozzles are of the type where the tip of the nozzle is fixed by inserting the tip of the nozzle into the hole drilled in the crack, so that the pressure at the time of injection causes the nozzle to rattle, and the gap between the outer surface of the injection nozzle and the inner surface of the hole There is a disadvantage that the sealing performance is poor. In order to solve such inconveniences, the present inventor has developed an injection nozzle which prevents rattling and improves sealing performance (see Japanese Utility Model Publication No. 3-55715).

[0003]

However, the injection nozzle described in the above-mentioned publication still has the following problems. First, the repair material often clogs and is not injected into the crack. This will be described in more detail with reference to FIG.
3 mm), the crack width is minute (0.05 mm).
Therefore, during injection, the repair material receives flow resistance at the tip of the nozzle, whereby only the water in the repair material is injected into the crack, and the cement component in the repair material accumulates near the crack entrance. Will be done. Second, the sealing member of the injection nozzle expands to seal the outer surface of the sealing member and the inner surface of the mounting hole. However, since the injection pressure is large, the repair material may leak.

Accordingly, an object of the present invention is to provide an injection nozzle capable of smoothly injecting a repair material into a crack. Another object of the present invention is to provide an injection nozzle in which a repair material does not leak during injection.

[0005]

According to a first aspect of the present invention, there is provided an injection nozzle including a cap made of an elastic material fitted inside a tip of a nozzle tube, wherein the cap has a thin straight line at the tip. Opening gradually expanding toward the rear end of the cap body, and at the rear end, a circular opening having a diameter substantially equal to or slightly smaller than the outer diameter of the cap body. It is characterized by having become.

The injection nozzle according to a second aspect of the present invention is the injection nozzle according to the first aspect, wherein one or a plurality of grooves are formed on an inner surface from a central portion to a rear end portion of the cap body. It is assumed that.

The injection nozzle according to the third aspect of the present invention is the injection nozzle according to the first or second aspect, wherein the sealing nozzle is in close contact with the outer wall of the concrete structure when the injection nozzle is used, over the entire outer periphery of its rear end. A flange portion is provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, a description will be given of a nozzle for injecting a repair material for a concrete structure according to a preferred embodiment of the present invention. The injection nozzle, generally designated by the reference numeral 10 in FIG. The nozzle tube 12 is formed of a metal tube having a predetermined length, and a male screw 12a is formed on the outer surface of the nozzle tube 12 over the entire length.

The injection nozzle 10 further includes a first nut 14 screwed to the nozzle tube 12 and a first washer 16 fitted to the nozzle tube 12 in this order from the tip side of the nozzle tube 12.
And a cylindrical seal body 18 fitted to the nozzle tube 12
A second washer 20 fitted to the nozzle tube 12;
Metal pressing tube 2 slidably fitted to nozzle tube 12
2 and a second nut 24 screwed to the nozzle tube 12. In addition, the seal body 18 is formed in a thick cylindrical shape by an elastic material such as rubber or synthetic resin.

[0010] A crack repair system (not shown) for a concrete structure as described in Japanese Patent No. 19676650 is connected to the rear end side of the nozzle tube 12 via a known opening / closing valve device 28. ing.

In the present specification, the term "front end" or "front end" means a side or a portion where the repair material for concrete structures flows out, and is referred to as "rear end side" or "rear end". Means a side or a portion opposite to the front end side or the front end portion.

The above configuration of the injection nozzle 10 is based on
This is substantially the same as the configuration of the injection nozzle described in JP-A-55715.

The concrete material repair material injection nozzle 10 according to a preferred embodiment of the present invention further comprises a cap body 26 fitted inside the tip of the nozzle tube 12, as shown in FIG. ing. Cap body 26
At the tip, as best shown in FIG.
It has a thin linear opening 26a. The opening 26a is
As shown in FIG. 2, it gradually widens toward the rear end, and at the rear end, as shown best in FIG. 3 (a), a diameter slightly smaller than the outer diameter of the cap body 26. Is formed as a circular opening 26b. The cap body 26 is
It is formed of an elastic material such as rubber, and its outer diameter is
It is substantially the same as the inner diameter of the nozzle tube 12.

With the above construction, the passage of the repair material supplied to the nozzle tube 12 through the repair material injection hose gradually narrows from the opening 26b of the cap body 26, and the opening 26
Therefore, the repair material does not receive a large flow resistance at the tip of the nozzle. Further, since the cap body 26 is formed of an elastic material, the cap body 26 expands due to the injection pressure of the repair material, and the outer surface of the cap body 26 comes into close contact with the inner surface of the nozzle tube 12, so that the cap body 26
The leakage of the repair material from the gap between the outer surface of the nozzle tube and the inner surface of the nozzle tube 12 is avoided.

FIG. 3C shows a modification of the cap body 26. That is, in the cap body 26 shown in FIG. 3C, four grooves 26c are formed on the inner surface from the center to the rear end. Thereby, the cap body 2
When the injection pressure of the repairing material is applied to the inner surface of the cap 6, the cap 26 easily expands, and more secure adhesion between the outer surface of the cap 26 and the inner surface of the nozzle tube 12 is obtained.

The use of the injection nozzle 10 configured as described above will be described with reference to FIG. First, a mounting hole for mounting the injection nozzle 10 is formed in a portion of the concrete structure where a crack has occurred. Next, the injection nozzle 10 is inserted into the mounting hole. At this time, the cap body 2
6 so that the tip of the cap 6 closely contacts the crack.
The length d of the protrusion from the nozzle tube 12 is adjusted. Then
Tighten the second nut 24. Then, the second nut 24
As a result, the pressing tube 22 is pressed leftward in FIG. 4, and this pressing force is applied to the seal body 18 via the washer 20. Since the seal body 18 is formed of an elastic material,
The seal body 18 expands and comes into close contact with the wall of the mounting hole. After that, the repair material is injected.

FIG. 5 shows an injection nozzle 10 according to a modified embodiment. The injection nozzle 10 shown in FIG. 5 is substantially the same as the injection nozzle 10 shown in FIG. That is, the seal body 18 of the injection nozzle 10 shown in FIG. 5 has a flange portion or a flange portion 18a over the entire outer periphery of the rear end portion. The flange or flange 18a is preferably formed integrally with the seal body 18.

As shown in FIG. 7, when the injection nozzle 10 is used, the flange portion or the flange portion 18a is in close contact with the outer wall of the concrete structure, and the gap between the outer wall of the seal body 18 and the wall of the mounting hole is provided. This helps to prevent the repair material from leaking out of the concrete structure through. Note that, in the modification shown in FIG. 5, the second washer 20 is, as shown in FIG.
It is preferable that the outer diameter of the flange portion 18a be substantially the same as the outer diameter of the flange portion 18a so that the outer diameter of the flange portion can be in close contact with the wall surface of the concrete structure.

The present invention is not limited to the above embodiments of the invention, and various modifications are possible within the scope of the invention described in the claims. It goes without saying that it is included in.

For example, in the above-described embodiment, the number of the grooves 26c of the cap body 26 is four, but the number of grooves may be one or a plurality other than four. Further, the diameter of the opening 26b of the cap body 26 is
May be substantially the same as the outer diameter of.

[0021]

According to the present invention, since the cap having the opening which gradually narrows in the outflow direction of the repair material is provided, the repair material does not receive a large flow resistance at the tip of the nozzle. In addition, the repair material can be smoothly injected into the crack. In addition, in the case where a seal member with a flange portion is used, leakage of the repair material from a gap between the outer wall of the seal member and the wall of the mounting hole can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a front view showing an injection nozzle according to a preferred embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a nozzle tube and a cap body of the injection nozzle of FIG. 1;

3A is a cross-sectional view taken along a line 3a-3a in FIG. 2, FIG. 3B is a cross-sectional view taken along a line 3b-3b in FIG. 2, and FIG. It is the same figure as (a) which showed the cap object of a modification.

FIG. 4 is a view showing a use state of the injection nozzle of FIG. 1;

FIG. 5 is a front view of an injection nozzle provided with a modified sealing body.

FIG. 6 is a sectional view of the seal body shown in FIG.

FIG. 7 is a diagram showing a use state of the injection nozzle of FIG. 5;

FIG. 8 is a view showing a use state of a conventional injection nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Injection nozzle 12 Nozzle tube 14, 24 Nut 16, 20 Washer 18 Seal body 18a Flange part 22 Pressing tube 26 Cap body 26a, 26b Opening 26c Groove

Claims (3)

[Claims] An injection nozzle for a repair material for a concrete structure, comprising: a nozzle pipe formed of a metal pipe having a predetermined length and having an external thread formed on an outer surface; and a nozzle pipe in order from a tip end of the nozzle pipe. A threaded first nut, a first washer fitted to the nozzle tube, a cylindrical seal made of an elastic material fitted to the nozzle tube, and a second seal fitted to the nozzle tube. A nozzle, a metal pressing pipe slidably fitted to the nozzle pipe, and a second nut screwed into the nozzle pipe, and fitted into the tip of the nozzle pipe. Further comprising a cap body made of a resilient material, the cap body having a thin linear opening at the front end thereof, the opening gradually expanding toward the rear end of the cap body, and the rear end. Part is approximately equal to or slightly smaller than the outer diameter of the cap body Injection nozzles, characterized in that has a circular opening with. 2. The injection nozzle according to claim 1, wherein one or a plurality of grooves are formed on an inner surface from a central portion to a rear end portion of the cap body. 3. The seal body according to claim 1, wherein the sealing body is provided with a flange portion which is in close contact with the outer wall of the concrete structure when the injection nozzle is used, over the entire outer periphery of the rear end portion. Injection nozzle.