JPH0674581B2 - Filler injection rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a filler injection rod provided with a check valve capable of injecting various fillers such as mortar and chemicals.

<Prior Art> FIG. 5 shows an example of a conventional rod for grout injection having a check valve function.

This rod has a plurality of discharge ports b in a concave portion a on the peripheral surface.
Is opened, and a cylindrical rubber ring c that closes each ejection port b group is attached to the recessed portion a.

This rod can push out the rubber ring c when the filler such as mortar is pressure-fed from the base end with the tip closed, and release the filler to the outside. Conversely, when the filler is not injected, the rubber ring is not injected. c has a structure in which each outlet b is closed to prevent the backflow of the filler.

<Problems to be Solved by the Present Invention> The conventional filler injection rod described above has the following problems.

(A) In order to secure the strength of the rod, it is necessary to form the recesses a at a certain interval.

Therefore, the injection range of the filler that can be injected from one recess a is limited to a narrow range, so that it is difficult to inject the required amount of the filler into the place where the injection is required.

(B) The discharge pressure of the filler discharged from the discharge port b group acts in the penetrating direction of the rubber ring c.

Therefore, there is a risk that the discharge of the filler strongly presses the rubber ring c against the hole wall surface and damages the hole wall to be protected.

<Object of the present invention> The present invention has been made in order to solve the above problems, and an object of the present invention is to provide the following filler injection rod.

(A) A filler injection rod that can be injected over a wide range without being restricted by the filler injection range.

(B) A rod for injecting the filler, which can prevent the breakage of the hole wall and smoothly fill the filler.

<Example 1> <A> Overall structure of injection rod FIG. 1 shows an overall view of the injection rod 1.

The injection rod 1 is composed of a perforated tube 2 having a closed end and an elastic valve ring 4 which is provided on the outer periphery of the perforated tube 2 and has a filling material injected from the proximal end of the perforated tube 2 with a hole. After flowing out of the pipe 2, the space between the valve rings 4 is spread and the filling material is discharged.

<B> Perforated Pipe The perforated pipe 2 is a hollow pipe having a large number of discharge ports 3 on its peripheral surface.

A tip cap 5 is screwed onto the outer periphery of the tip of the perforated tube 2 to close the tip opening.

<C> Valve Ring The valve ring 4 is a ring body having an inner diameter equal to the outer diameter of the perforated pipe 2, and its cross-sectional shape is substantially V-shaped or triangular.
The cross-sectional shape of the inner peripheral surface is substantially V-shaped. As the material of the valve ring 4, for example, an elastic material such as rubber is used.

The valve ring 4 will be described in detail. As shown in FIG. 2, the valve ring 4 has a continuous central groove 41 at its center and two arm portions 42, 42 on both sides of the central groove 41.

The side surfaces of the arm portions 42, 42 of the valve rings 4, 4 are the perforated tube 2
Is inclined so that the cross-sectional width on the free end side is wider than the surface width in contact with.

A tapered space 43 is interposed between the side surfaces of the adjacent valve rings 4, 4.

A plurality of valve rings 4 having the above structure are fitted on the peripheral surface of the perforated tube 2 to which a tip cap 5 is fixed, and are perforated by a nut 7 screwed to the perforated tube 2 via a steel stopper ring 6. It is fixed to the tube 2.

That is, both ends of the continuous body of the valve ring 4 are held and fixed by the stopper rings 6 of the tip cap 5 protruding from the outer peripheral surface of the perforated tube 2.

As shown in FIG. 2, the positional relationship between the valve ring 4 and the discharge port 3 of the perforated pipe 2 is as shown in FIG. Located between Exit 3,
Moreover, the tips of the respective arm portions 42 having a substantially V-shaped cross section on the inner peripheral surface of the valve ring 4 are in contact with each other directly above the discharge port 3.

<Operation of the Present Invention> Next, a method of injecting a filler using the injection rod of the present invention will be described.

<A> Installation of injection rod The injection rod 1 having the above structure is inserted to a predetermined depth in advance.

Then, the anchor is fixed according to a known anchor forming method.

<B> Low-pressure injection of filler Next, low-strength mortar milk or the like is injected at low pressure between the drill hole and the injection rod 1.

<C> High-pressure injection of filler (Fig. 2) After the filler injected at low pressure is cured, the filler such as mortar is then pressure-fed from the base end of the perforated pipe 2.

The filling material filled in the perforated tube 2 moves to the outside of the perforated tube 2 through the discharge port 3 and fills the space 43.

The filler is discharged to the outside by pushing out the arms 42 of the adjacent valve rings 4 and 4.

Further, the filler discharged from between the valve rings 4 and 4 penetrates into the surrounding ground while causing cracks in the low-strength mortar around the injection rod 1 to occur.

In this way, since the discharge pressure of the filling material is received by the inclined side surface of the valve ring 4, the diameter of the valve ring 4 does not increase as in the conventional case, and each arm 42 is pushed in the axial direction of the perforated pipe 2. It can only be unfolded.

Therefore, there is no concern that the natural ground located outside the valve ring 4 will be destroyed as in the conventional case.

<D> Completion of injection When the pumping of the filling material is stopped, the respective valve rings 4 that have been expanded until then are restored to their original shape by elasticity.

As a result, the side surfaces of the adjacent valve rings 4 and 4 are in close contact with each other and the backflow of the filler is restricted.

<E> Injectability In the case of conventional injection rods, the width of one rubber ring that functions as a check valve is wide and the distance between rubber rings is large, so both ends of each rubber ring are rare. The filling material is discharged linearly from.

On the other hand, in the injection rod 1 according to the present invention, the number of valve rings 4 performing the function of a check valve per unit length is larger than in the conventional case, and the installation interval of the valve rings 4 is narrow, so that the injection rod 1 is injected. The filler can be uniformly injected from the entire circumferential surface of the working rod 1.

Therefore, the injection property of the filler is improved as compared with the conventional case.

<Example of Use> As an example of use of the injection rod 1 of the present invention, the injection rod having the above-described structure is previously embedded in a required position of a bridge or a beam portion of various structures where cracks are expected to occur, and cracks are formed. At the time of occurrence of the above, there is a case where a filler having a followability such as mortar, cement milk, asphalt, and various resins is injected at high pressure from the base end of the injection rod 1.

Specifically, as shown in FIG. 4, the injection rod 1 can be used for filling cracks in anchors where cracks are expected to occur.

That is, the injection rod 1 is previously inserted into the corrugated sheath 9 together with the anchor 8 to be fixed, and is embedded in the corrugated sheath 9 inside and outside by the solidifying material 10.

Then, when a crack is expected to occur in the solidifying material 10 around the anchor 8, another solidifying material is injected from the base end of the injection rod 1 and injected into the crack.

Further, the injection rod 1 can be positioned outside the corrugated sheath 9 for the purpose of filling cracks generated in the solidified material filled between the corrugated sheet 9 and the ground.

<Example 2> In Example 1, the case where the valve ring 4 is made of the same elastic material has been described, but a laminated structure of materials having different hardness may be adopted as shown in FIG.

That is, the valve ring 4 of this embodiment has a triangular cross section, and is composed of the soft layer 44 formed at the center and the hard layer 45 formed outside the soft layer 44 and harder than the soft layer 44.

As described above, when a material softer than the surface layer is arranged in the center of the valve ring 4, the filling material is easily deformed by the discharge pressure, which is suitable for low-pressure filling work of the filling material.

In addition, since the valve ring 4 has a shape with no dent on the outer circumference, there is no concern that a filler such as mortar will go around the outer circumference of the valve ring 4.

<Third Embodiment> In the first and second embodiments, the case where the injection rod 1 is configured as a split type has been described, but only the valve ring 4 is a separate member, and the remaining parts are an integrated type, and a combination structure of these is used. It is also possible to adopt the injection rod 1 of 1.

That is, the injection rod of the present embodiment has a plurality of grooves recessed in the circumferential direction on the outer circumference of the hollow tube with the tip closed, a plurality of discharge ports opened at the bottom of each groove, and fitted into each groove. The valve ring 4 is made of the same elastic material as that of the above-described embodiment and has a substantially V-shaped cross section.

The operation and effect of this embodiment are the same as those of the above-mentioned embodiment, and therefore the description thereof is omitted.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

(A) Since the injection rod according to the present invention has a narrower number of valve rings, which are check valves per unit length of the rod, and the distance between the valve rings than the conventional rod, the injection rod according to the present invention has the entire circumference of the rod. The filler is uniformly discharged from the surface.

Therefore, even if the presence of cracks is not checked, if the cracks are present, the filler will infiltrate into the cracks, and it is possible to perform good grout injection without uneven filling of the filler.

(B) Since the cross-sectional shape of the inner peripheral surface of the valve ring is substantially V-shaped, the discharge pressure of the filler acts on the inclined side surface of the valve ring.

Therefore, there is no problem that the diameter of the valve ring is expanded and the surrounding ground is destroyed during the filling operation of the filler.

(C) If the central portion of the valve ring is made of a soft material and the surface layer portion is made of a material harder than the central portion, the force required for expanding the diameter of the valve ring can be small.

Therefore, it is suitable for low-pressure injection of the filler.

(D) Since the wall thickness of the perforated pipe does not decrease, sufficient strength can be maintained.

Therefore, it can also be used for small diameter injection rods.

[Brief description of drawings]

 FIG. 1: Overall perspective view of injection rod according to the present invention FIG. 2: Partially enlarged view of valve ring FIG. 3: Explanatory view of valve ring of Example 2 FIG. 4: Description of use example of injection rod Fig. 5: Explanatory drawing of conventional injection rod

Claims (1)

[Claims] 1. A perforated pipe having a large number of discharge ports on its peripheral surface, and an elastic material such as rubber having an V-shaped cross section in its inner peripheral surface which is fitted around the perforated pipe to close the discharge ports. A ring of material, the contact portion of the ring with the perforated pipe is located between the outlets of the perforated pipe, and the tips of the arm portions each having a substantially V-shaped cross section of the inner peripheral surface are connected to each other. A rod for injecting a filler material, which is configured to come into contact directly above the discharge port of a perforated pipe.