JP3233351U - Packer nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new packer nozzle capable of surely preventing falling out from an injection hole drilled in a concrete wall surface and leakage of a repair material. A taper 41 is formed at an end of a ring 40 for compressing a tube 30 with a pusher 20. As a result, the diameter of the end of the tube 30 expands at the same time as compression in the injection hole H, and this acts like a wedge, so that the airtightness and holding force are improved and the nozzle body 10 comes off from the injection hole H. Leakage of repair material can be reliably prevented. [Selection diagram] Fig. 1

Description

The present invention relates to a packer nozzle used in an alkaline aggregate reaction inhibitor injection method, which is one of the repair methods for concrete structures.

The alkaline aggregate reaction inhibitor injection method is known as one of the repair methods for concrete structures that have deteriorated over time. In this repair method, for example, an alkaline aggregate reaction inhibitor such as lithium nitrite is injected into the concrete as a repair material and permeated to immobilize the corroded reinforcing bars inside, resulting in rust and expansion of the reinforcing bars. It prevents the deterioration of concrete.

In this method, for example, as shown in Patent Document 1 below, a large number of injection holes are drilled on the surface of a concrete structure to be repaired at predetermined intervals, and a liquid discharge nozzle called a packer nozzle is formed in each of the injection holes. Are inserted respectively. A capsule containing lithium nitrite is connected to this nozzle. By connecting this capsule to a hydraulic hose and pressurizing it with a pressure source such as a compressor, lithium nitrite in the capsule is passed through a packer nozzle. It is injected into the concrete and permeated.

Japanese Unexamined Patent Publication No. 2011-038347

By the way, in the repair method as described above, lithium nitrite is pressurized and injected from the packer nozzle into each injection hole, so that pressure must be securely held so that the packer nozzle does not come off. Must be. In particular, in order to allow lithium nitrite to permeate over a wide range, the pressure needs to be higher, so a high holding force is required. Further, not only the packer nozzle is required to come off, but also excellent airtightness is required so that lithium nitrite injected at high pressure does not leak to the outside through the gap between the packer nozzle and the injection hole.

Therefore, the present invention has been devised to solve these problems, and the purpose is to provide a new packer nozzle that can surely prevent falling out from the injection hole and leakage of the repair material. ..

In order to solve the above problems, the present invention has a nozzle body having an injection head at the tip, a pusher screwed into the nozzle body, a expandable / contractible tube located between the pusher and the injection head, and the tube. The packer nozzle is provided with a tubular ring located between the pusher and the pusher, and has a taper formed at the tube side end of the ring.

According to such a configuration, when the nozzle body is inserted into the injection hole formed in the concrete wall surface from the injection head side and then the pusher is screwed into the injection head side, the tube is moved to the injection head side by the tubular ring. It is pushed and expands in the radial direction. As a result, the tube adheres to the injection hole and closes the gap, and at the same time, acts to hold the nozzle body in the injection hole.

Further, when the pusher is screwed into the injection head side and the ring is pushed into the tube side from that state, the taper at the tip of the ring slips into the inside of the tube and gradually forcibly expands the end portion of the tube. As a result, the enlarged tube end is pressed against the wall surface of the injection hole and acts like a wedge, so that the nozzle body can be prevented from falling out of the injection hole even when a high pressure is applied. Here, the tube may be a material that can be expanded and contracted and that can exhibit the function of holding the injection hole and the airtightness by swelling and pressure contacting when pressed. For example, a urethane tube is used. Is desirable.

According to the present invention, since a taper is formed at the end of the ring that compresses the tube, the diameter of the tube end expands at the same time as compression, and this acts like a wedge, so that excellent airtightness and high holding function are provided. Demonstrate. As a result, it is possible to reliably prevent the nozzle body from coming off from the injection hole and the repair material from leaking.

It is sectional drawing (side view) which shows one Embodiment of the packer nozzle 100 which concerns on this invention. It is sectional drawing which shows the state which the packer nozzle 100 which concerns on this invention is inserted into the injection hole H formed in the concrete wall surface W. It is a partially enlarged view which shows the S part in FIG. It is sectional drawing (side view) which shows the comparative example 200 (long). It is sectional drawing (side view) which shows the comparative example 300 (short). It is a conceptual diagram which shows the state which the comparative example (long) was inserted into the injection hole H. It is a conceptual diagram which shows the state which the comparative example (short) was inserted into the injection hole H.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view (side view) of the packer nozzle 100 according to the present invention. As shown in the figure, the packer nozzle 100 includes a nozzle body 10 having an injection head 11 at the tip, a pusher 20 screwed to the outside of the nozzle body 10, and a tube 30 located between the pusher 20 and the injection head 11. It is mainly composed of the ring 40 and the ring 40.

The nozzle body 10 is made of a metal pipe having both ends open, and has an injection head 11 at its tip, and a joint 12 and an O-ring 13 and a head for connecting a capsule or the like (not shown) at the rear end. 14 are provided in order. The length of the nozzle body 10 is not particularly limited, but generally 8 to 9 cm is often used.

The pusher 20 is composed of, for example, a hexagon nut, and is screwed into a screw thread 15 formed around the nozzle body 10 so as to be movable back and forth on the nozzle body 10 along the axial direction. The tube 30 is made of a stretchable material such as urethane, and one end surface thereof is in contact with the injection head 11 side. The size of the tube 30 is not particularly limited, but for example, a tube 30 having a length of 3 to 5 cm and fitted so as to be in close contact with the outside of the nozzle body 10 and having a wall thickness of about 1.5 to 2.0 mm is often used. ..

The ring 40 is made of a metal cylinder, and is provided so that one end of the ring 40 is in contact with the other end of the tube 30 and the other end is in contact with the pusher 20. A taper 41 is formed at the end of the ring 40 on the tube 30 side so as to gradually reduce the diameter toward the tip thereof. Similarly, the size of the ring 40 is not particularly limited, but for example, the ring 40 is fitted so as to be in close contact with the outside of the nozzle body 10 with a length of 2 cm, and its wall thickness is about 1.5 to 2.0 mm, which is the same as that of the tube 30. Things are often used.

FIG. 2 is a cross-sectional view showing a state in which the packer nozzle 100 is inserted into the injection hole H of the concrete wall surface W and the preparation for injection of the repair material is completed. That is, first, the packer nozzle 100 is inserted into the injection hole H from the injection head 11 side in the state shown in FIG. 1 until the pusher 20 hits the wall surface W. The size of the injection hole H is such that the portion from the injection head 11 to the ring 40 can be smoothly inserted, for example, a diameter of about 10 mm and a length of about 100 mm.

Next, when one of the pusher 20 or the nozzle body 10 is fixed and the other is forcibly rotated from such a state using a wrench or the like, the distance between the pusher 20 and the head 14 gradually increases, and the ring 40 Is pushed toward the injection head 11 and compresses the tube 30 in the axial direction thereof. As a result, the substantially central portion of the tube 30 expands in the radial direction and adheres to the inner surface of the injection hole H to close the gap, and at the same time, acts to hold the nozzle body 10 in the injection hole H.

Further, when the pusher 20 is pushed in from this state, as shown in FIGS. 3 (A) to 3 (B), the taper 41 at the tip of the ring 40 slips into the inside of the tube 30, and the end of the tube 30 is gradually forced. Spread to. As a result, the end of the expanded tube 30 is pressed against the inner wall surface of the injection hole H and acts like a wedge to further improve the holding force. Therefore, even if the nozzle body 10 is pulled strongly, the nozzle body 10 is pressed against the injection hole H. Never fall out of.

4 and 5 show examples of packer nozzles 200 and 300 having two types of long and short tube 30 portions as a comparative example, and the difference from the packer nozzle 100 of the present invention is that the tube 30 of the ring 40 is different. Only the point where the taper 41 is not formed at the side end portion. In the case of the packer nozzle 200 in which the portion of the tube 30 is long, in the state where the taper 41 is not provided as described above, all the pressing force of the ring 40 is transmitted to the tube 30 as shown in FIG. 30 causes buckling on the way, resulting in low airtightness and holding power.

On the other hand, in the case of the packer nozzle 300 in which the tube 30 is short, as shown in FIG. 7, the contact area between the tube 30 and the injection hole H becomes small, so that it is difficult to exhibit high holding force and airtightness. On the other hand, in the packer nozzle 100 of the present invention, buckling does not occur even if the long tube 30 is used as described above, and the end portion thereof expands in diameter to act like a wedge, so that it is excellently sealed. It can exert its sexuality and high holding power. For example, in the configuration of the comparative example, the upper limit of the injection pressure of the repair material is 2 MPa, whereas the packer nozzle 100 of the present invention can withstand a pressure as high as 5 MPa.

The higher the injection pressure of the repair material, the larger the range and speed of penetration into the concrete wall, so the number of injection holes H can be reduced, improving work efficiency and significantly shortening the construction period. It will be possible. For example, when the injection pressure is 0.7 MPa, it takes about 10 days to sufficiently infiltrate the repair material such as lithium nitrite into the concrete wall, but with the packer nozzle 100 of the present invention, it takes about 10 days. Since it can be infiltrated at a high pressure of about 5 MPa at the maximum, the construction period can be shortened.

After the work is completed, if the pusher 20 is turned in the opposite direction, the diameter of the tube 30 is reduced to the original state and the wedge state is eliminated, so that the packer nozzle 100 can be easily removed from the injection hole H. ..

100 ... Packer Nozzle 10 ... Nozzle Body 11 ... Injection Head 12 ... Joint 13 ... O-ring 14 ... Head 15 ... Thread 20 ... Pusher 30 ... Tube 40 ... Ring 41 ... Taper H ... Injection Hole W ... Concrete Wall

Claims (2)

A nozzle body having an injection head at the tip, a pusher screwed into the nozzle body, a expandable / contractible tube located between the pusher and the injection head, and a tubular shape located between the tube and the pusher. A packer nozzle that is provided with a ring and has a taper formed at the end of the ring on the tube side. The packer nozzle according to claim 1, wherein the tube is a urethane tube.

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