KR100800580B1 - Spray gun for mortar and mortar construction method using thereof - Google Patents

Abstract

The present invention relates to a mortar spraying device for spraying mortar used for construction, repair, reinforcement of a structure, and a mortar construction method using the mortar spraying device, and more particularly, when a large amount of reinforcing short fibers are mixed in mortar. In addition, the present invention relates to a mortar injector having an improved structure so that the mortar can be sprayed at a desired point and a construction method using the mortar injector.

The present invention includes a main body having a first hollow portion through which mortar is introduced; One end is coupled to the main body, there is a second hollow portion is formed in one side is connected to the first hollow portion and the other side is exposed to the outside, the second hollow portion is tapered the inner diameter is smaller from one side to the other side A nozzle comprising a portion; And a gas chamber formed between an inner circumferential surface of the main body and an outer circumferential surface of the nozzle, the gas chamber being a space into which the high pressure gas flows, wherein the nozzle is configured to inject the high pressure gas introduced into the gas chamber into the second hollow part. And a plurality of gas passages connecting the second hollow portions, wherein the plurality of gas passages comprise a first gas passage connected to a first position of the second hollow portion and a first gas passage formed from a first position of the second hollow portion. It provides a mortar injection device comprising a second gas passage connected to a second position spaced a predetermined distance to the other side of the two hollow portion.

In addition, the present invention comprises the steps of providing the above-described mortar injection device; Supplying mortar to the second hollow portion through the first hollow portion; And supplying a high pressure gas to the second hollow portion through the gas chamber and the first and second gas passages, and spraying the mortar in the second hollow portion to the outside. .

Description

Mortar spraying device and mortar construction method using the mortar spraying device {Spray gun for mortar and mortar construction method using Julia}

1 is a cross-sectional view of an example of a conventional mortar injector.

Figure 2 is an exploded perspective view of the mortar injector according to an embodiment of the present invention.

3 is a combined cross-sectional view of the mortar injector shown in FIG.

4 and 5 are views for explaining the gas passage provided in the nozzle shown in FIG.

** Explanation of symbols for the main parts of the drawing **

10: main body 11: first hollow portion

20: nozzle 21: second hollow portion

211: first position 212: second position

22: taper portion 30: gas chamber

31: first gas passage 32: second gas passage

The present invention relates to a mortar injector for injecting mortar used for construction, repair, reinforcement of a structure, and a mortar construction method using the mortar injector. More specifically, a large amount of reinforcing short fibers are mixed into mortar. The present invention relates to a mortar spraying apparatus having an improved structure so as to smoothly spray mortar at a desired point and a mortar construction method using the mortar spraying apparatus.

Mortar is a mixture of cement, finesse and water, as is well known. Mortar is one of the most commonly used building materials, having been developed for hundreds of years. As a result of continuous research to improve the properties of mortars, mortars in the form of mixed admixtures in addition to cement, fine aggregates, and sand have been developed. In addition to water and various admixtures described above, fiber reinforced mortars including short fibers for reinforcement with strong tensile strength are commercially available, and fiber reinforced mortars containing short fibers are used to reinforce deteriorated areas of reinforced concrete structures. Is growing.

The construction of the fiber-reinforced mortar is widely used, such as a method of applying directly to the deteriorated portion of the reinforced concrete structure by the worker or after spraying the mortar by mortar spraying device, the finishing of the mortar with a plastering knife, mortar spraying device Since the method can be much more efficient and faster construction, the construction by the mortar spraying device is carried out a lot.

A mortar injector used in the construction of fiber reinforced mortar is shown in FIG. 1. Mortar injector shown in Figure 1 is generally used as an injector of the fiber reinforced mortar injector used for the construction of shotcrete used in tunnels and the like.

Shotcrete refers to concrete that is sprayed by using compressed air and is commonly used in tunnel construction. Such shotcrete is characterized in that it is hardened in a short time by being sprayed on the ceiling or wall of the tunnel during the construction of the tunnel. Conventional mortar injector for shotcrete is designed to inject mortar at very high pressure because it is a device for spraying shotcrete on the ceiling of a tunnel to keep the injected shotcrete adhered to the ceiling without falling down. If such a device is used in the construction of reinforcement mortar, the fiber reinforcement mortar will also be sprayed at very high pressure.

Such a conventional mortar injector includes a main body 1, a nozzle 2 and a gas chamber 3. One end of the main body 1 is connected to a mortar hose 5 for conveying mortar, and the nozzle 2 is connected to the other end. One end of the nozzle 2 is connected to the main body 1, the other end is exposed to the outside, and a taper portion 2a is provided in which the inner diameter decreases toward the other end, so that the feed speed of the mortar is increased by the nozzle 2. Faster to the other end of the. The gas chamber 3 is provided in the main body 1 and is connected to the high pressure gas pipe 6. In general, the inner circumferential surface of the main body 1 has a circular cross section, and the gas chamber 3 is an annular space formed between the inner circumferential surface and the outer circumferential surface of the main body 1. The gas passage 4 is a hole connecting the gas chamber 3 and the inner circumferential surface of the main body 1 to each other, and a plurality of gas passages 4 are formed along the circumferential direction of the inner circumferential surface of the main body 1, and generally, the center of the inner circumference of the main body 1 is formed. Four points are provided in the form of point symmetry.

The mortar moves from the mortar hose 5 along the main body 1 and the nozzle 2 in the direction indicated by the bold arrow in FIG. 1 and is then sprayed to the point where the mortar should be constructed. At this time, the injection speed of the mortar is increased by the high pressure gas moving along the gas chamber 3, the gas passage 4 from the high pressure gas pipe 6, as indicated by the arrow in FIG.

In the case of the conventional mortar injector, although the gas passage 4 is provided in plural along the circumferential direction of the inner circumferential surface of the main body 1, the position of the end portion of the gas passage 4 inside the main body 1 is located. Is present in one plane, the efficiency of the mortar is in the process of promoting the mortar, so that the high pressure of the gas flowing through the high-pressure gas pipe (6) is required to efficiently inject the mortar.

On the other hand, in the case of the conventional mortar spraying device, the length of the nozzle 2 is formed longer than the length of the main body 1, which has a distance between the end of the nozzle 2 and the construction position due to the construction characteristics of shotcrete. The straightness of the mortar to be injected is required because the longer the length of the nozzle 2, the straightness is improved. However, the fiber reinforced mortar contains a shorter fiber for reinforcement and has a higher viscosity than the shotcrete. Therefore, when the length of the nozzle 2 is long, when the fiber reinforced mortar is sprayed, between the inner peripheral surface of the nozzle 2 and the fiber reinforced mortar Since the mortar injector vibrates violently due to the frictional force of, the construction is difficult and the nozzle 2 is clogged.

The present invention was derived to solve the above problems, even when constructing a fiber-reinforced mortar containing a large amount of short fibers in the mortar mortar spraying apparatus capable of spraying mortar smoothly and mortar construction and the mortar using the device The purpose is to provide a construction method.

In order to achieve the above object, the present invention,

A main body having a first hollow portion through which mortar is introduced;

One end is coupled to the main body, there is a second hollow portion is formed in one side is connected to the first hollow portion and the other side is exposed to the outside, the second hollow portion is tapered the inner diameter is smaller from one side to the other side A nozzle comprising a portion; And

And a gas chamber formed between an inner circumferential surface of the main body and an outer circumferential surface of the nozzle, the gas chamber being a space into which the high pressure gas flows.

The nozzle is provided with a plurality of gas passages connecting the gas chamber and the second hollow portion to inject the high pressure gas introduced into the gas chamber into the second hollow portion.

The plurality of gas passages may include a first gas passage connected to a first position of the second hollow portion, and a second gas passage connected to a second position spaced a predetermined distance apart from the first position of the second hollow portion to the other side of the second hollow portion. It provides a mortar injector comprising a gas passage.

The length of the second hollow portion is preferably shorter than the length of the first hollow portion.

Preferably, the first gas passage and the second gas passage are provided in plural numbers, respectively.

The cross section of the second hollow portion of the nozzle is preferably circular.

In addition, the present invention comprises the steps of providing a mortar injector as described above;

Supplying mortar to the second hollow portion through the first hollow portion;

And supplying a high pressure gas to the second hollow portion through the gas chamber and the first and second gas passages, and spraying the mortar in the second hollow portion to the outside. .

The high pressure gas is preferably compressed air of 5 to 7 atm.

Hereinafter, with reference to the drawings will be described a preferred embodiment of the present invention.

2 is an exploded perspective view of a mortar injector according to an embodiment of the present invention, FIG. 3 is a cross-sectional view of the mortar injector shown in FIG. 2, and FIGS. 4 and 5 are gas cylinders provided in the nozzle shown in FIG. 2. It is a figure for demonstrating a furnace.

Mortar injector according to an embodiment of the present invention includes a main body 10 and the nozzle 20.

The main body 10 has a first hollow portion 11 through which mortar flows, and a cross section of the first hollow portion 11 is circular.

One end of the main body 10 is provided with a mortar hose coupling part for connection with a mortar hose 5 for transporting mortar for injecting mortar into the first hollow part 11. Groove 12.

One end of the nozzle 20 is coupled to the main body 10, and one side of the nozzle 20 is connected to the first hollow part 11, and the other side of the nozzle 20 is exposed to the outside. ) Is formed. In order to connect the first hollow portion 11 and the second hollow portion 21 to each other, the main body 10 and the nozzle 20 are screwed together, and for this purpose, a male screw portion 15 is provided in the main body 10. A female threaded portion 25 is formed in the nozzle.

The length of the second hollow portion 21 is shorter than the length of the first hollow portion 11 provided in the main body 10.

The second hollow portion 21 includes a tapered portion 22 whose inner diameter decreases from one side to the other side, the cross section of which is circular.

The gas chamber 30 is formed between the inner circumferential surface 13 of the main body 10 and the outer circumferential surface 23 of the nozzle 20. The gas chamber 30 is a main body of a part in which the first hollow part 11 and the second hollow part 21 are connected to each other in a state in which the main body 10 and the nozzle 20 are coupled as shown in FIG. 3. It is located between the inner circumferential surface 13 of 10 and the outer circumferential surface 23 of the nozzle 20. The cross section of the outer circumferential surface 23 of the nozzle 20 and the inner circumferential surface 13 of the main body 10 are both circular, and therefore, the gas chamber 30 can be said to be an annular space.

The gas nozzle 30 and the second hollow part 21 are injected into the nozzle 20 by injecting the high pressure gas introduced into the gas chamber 30 into the second hollow part 21 to inject mortar at a high pressure. A plurality of gas passages to be connected are formed.

The gas passage includes a first gas passage 31 and a second gas passage 32.

The first gas passage 31 is a gas passage connecting the gas chamber 30 and the first position 211 of the second hollow portion to each other, and the second gas passage 32 connects the first position 211 to the second position. It is a gas passage connecting the second position 212 and the gas chamber 30 spaced a predetermined distance to the other side of the hollow portion 21.

The first gas passage 31 and the second gas passage 32 are provided in plural, respectively, in this embodiment, two first gas passages 31 and four second gas passages 32 are provided. Accordingly, the first position 211, which is the point where the first gas passage 31 meets the second hollow part 21, is the second position where the second gas passage 32 meets the second hollow part 21. Four positions 212 are formed.

4 and 5 are views for explaining the arrangement of the first gas passage 31 and the second gas passage 32, Figure 4 is a portion of the nozzle 20 by cutting the first gas passage 31 and It is a perspective view for demonstrating arrangement | positioning of the 2nd gas path 32, and FIG. 5 is a top view of the nozzle, and is a figure which shows the shape of the nozzle 20 when a visual line goes from a main body side to a nozzle side.

As shown in FIGS. 4 and 5, the two first positions 211 and the four second positions 212 are formed in the same plane, respectively. In this case, when the plane formed by the two first positions 211 is called the first plane and the plane formed by the four second positions 212 is called the second plane, the second plane is the first plane. Compared to the plane, it is located on the other side of the second hollow portion 21, i.e., on the downstream side in the moving direction of the mortar. Meanwhile. The two first positions 211 are arranged at a point symmetrical position with respect to the center of the first plane formed by the first positions 211, and each of the four second positions 212 is also two. It is arrange | positioned so that it may become point symmetry with respect to the center of a 2nd plane, respectively.

Hereinafter, a method of constructing mortar by using a mortar injector according to the present embodiment will be described in detail.

Mortar construction method according to the present invention comprises the steps of providing a mortar injection device of the above embodiment; Supplying mortar; And spraying mortar using high pressure gas. In the case of the embodiment of the mortar construction method will be described for the case of constructing a fiber-reinforced mortar containing reinforcing short fibers.

The preparing of the mortar injector of the above-described embodiment means to prepare the above-described mortar injector so that mortar can be installed at the mortar construction site, and the main body 10 and the nozzle 20 are assembled together. And a step of connecting the mortar hose 5 and the high pressure gas pipe 6 to the main body 10.

The step of supplying the mortar is a step of supplying the fiber reinforced mortar from the mortar hose 5 for transporting the mortar through the first hollow portion 11 of the main body 10 to the second hollow portion 21 of the nozzle 20. to be.

When mortar is supplied to the second hollow portion 21, the mortar is sprayed to a desired position using the high pressure gas.

At this time, the high-pressure gas uses compressed air of 5 to 7 atm, but when using compressed air of 5 atm or less, the pressure is low, so that the smooth mortar is not sprayed and the mortar is not adhered to the surface to be constructed. It flows downward along the surface, and the workability is reduced. When using compressed air of 7 atm or more, the high pressure is so high that it is difficult to control the thickness of the mortar that is injected due to the large amount of mortar, or the newly sprayed mortar is newly sprayed. The problem of moving to the surroundings is caused by the mortar, and also, a part of the sprayed mortar is not attached to the construction surface, and splashes to the surroundings, resulting in a problem that the surrounding area becomes dirty.

The high pressure gas is supplied from the high pressure gas pipe 6, and the supplied high pressure gas is supplied to the first inside the second hollow part 21 through the gas chamber 30, the first air passage 31, and the second air passage 32. Supplied to position 211 and second position 212. At this time, since the first position 211 is an upstream side when viewed in the direction of movement of the mortar, the high pressure gas is first supplied to the mortar from the first position 211, and then the second position 211 which is downstream in the direction of movement of the mortar. ), The high pressure gas is supplied to the mortar secondarily. When the high-pressure gas is injected into the mortar by dividing it in two times, the high-pressure gas is injected secondly while the mortar has the driving force by the first-injected high-pressure gas. Compared to the above, an advantage arises. In addition, when the high-pressure gas is injected into the fiber reinforcement mortar twice, the injection efficiency is increased as described above, and the dispersibility of the short fiber for reinforcement is also improved. This is because they are dispersed and distributed very homogeneously without being agglomerated in a part of the mortar and then injected by the secondary high pressure gas injection.

Meanwhile, two first positions 211 are provided, and point symmetry is performed based on the center of the first plane, which is a plane formed by the two first positions 211. In addition, four second positions 212 are provided, and two second positions 212 and four second positions 212 are also arranged so as to be point-symmetrical with respect to the center of the second plane. Part of the high-pressure gas is not driven, evenly dispersed form of the high-pressure gas can be injected can be produced.

It is preferable that the cross section of the second hollow portion 21 is circular. When the cross section is circular, the pressure applied to the inner wall of the nozzle 20 is uniformly dispersed by mortar so that stress is concentrated on a part of the inner wall of the nozzle 20. This is because the phenomenon can be prevented.

The first gas passage 31 and the second gas passage 32 are provided in plural numbers, respectively, so that the efficiency of gas injection can be increased, and the gas injected by the arrangement as described above can be evenly injected into the mortar. You can also expect the effect.

When the high pressure gas is supplied, the mortar in the second hollow portion 21 is sprayed to the outside, that is, the desired part of the construction, by the above-described mechanism using the high pressure gas.

In this case, the distance between the end of the nozzle 20 and the part to which the mortar is sprayed to be attached is maintained within 30 cm, and the angle of the end of the nozzle 20 to the part to which the mortar is to be sprayed is preferably maintained similar to the vertical.

At this time, the length of the second hollow portion 21 is shorter than the length of the first hollow portion 11, but if the length of the second hollow portion 21 is short, the time for the mortar to stay in the second hollow portion 21 is short. Therefore, there is less friction between the mortar and the inner circumferential surface of the nozzle, that is, the wall surface of the second hollow portion 21, so that the mortar can be smoothly sprayed.

When mortar is injected to the other side of the second hollow portion 21 of the nozzle 20, the amount of mortar that is injected is again blown through the first hollow portion 11 by the mortar hose 5. ), Continuous mortar spraying is possible.

In the above description, the embodiment of the second hollow portion having a length shorter than the length of the first hollow portion has been described. However, this configuration only has the advantage of smoothing the injection of mortar by reducing friction with the wall surface of the second hollow portion. The length of the second hollow portion must be shorter than the length of the first hollow portion so that it is not included in the technical idea of the present invention.

In the above description, an embodiment in which a plurality of first gas passages and two second gas passages 32 are provided, respectively, is provided. However, a plurality of first gas passages and second gas passages 32 must be provided. The present invention is not intended to achieve the object, it should be seen that the implementation of the first gas passage and the second gas passage 32 are each included in the technical idea of the present invention.

In the above description of the embodiment in which the high pressure gas is compressed air having a pressure of 5 to 7 atmospheres, the high pressure gas is not necessarily required to have a pressure as described above. It should be seen as included.

Although the preferred embodiments of the present invention have been described above, the technical idea of the present invention is not limited to the described embodiments, and various types of mortar injectors and their mortars are provided within the scope not departing from the technical idea of the present invention. Mortar construction method using an injection device can be provided.

As described above, according to the present invention, even when constructing a fiber-reinforced mortar containing a large amount of short fibers in the mortar provides a mortar spraying apparatus that can be sprayed mortar smoothly and mortar construction and a mortar construction method using the apparatus can do.

Claims (6)

A main body having a first hollow portion through which mortar is introduced; One end is coupled to the main body, there is a second hollow portion is formed in one side is connected to the first hollow portion and the other side is exposed to the outside, the second hollow portion is tapered the inner diameter is smaller from one side to the other side A nozzle comprising a portion; And And a gas chamber formed between an inner circumferential surface of the main body and an outer circumferential surface of the nozzle, the gas chamber being a space into which the high pressure gas flows. The nozzle is provided with a plurality of gas passages connecting the gas chamber and the second hollow portion to inject the high pressure gas introduced into the gas chamber into the second hollow portion. The plurality of gas passages may include: a first gas passage connected to a first position of the second hollow portion; and a second gas passage connected to a second position spaced a predetermined distance apart from the first position of the second hollow portion to the other side of the second hollow portion. It includes a gas passage, Mortar spraying device, characterized in that the length of the second hollow portion is shorter than the length of the first hollow portion. delete The method of claim 1, And a plurality of first gas passages and a plurality of second gas passages, respectively. The method of claim 1, Mortar injector, characterized in that the cross section of the second hollow portion of the nozzle is circular. Providing a mortar injector according to claim 1; Supplying mortar to the second hollow portion through the first hollow portion; And supplying a high pressure gas to the second hollow portion through the gas chamber and the first and second gas passages, and spraying the mortar in the second hollow portion to the outside. The method of claim 5, The high pressure gas mortar construction method, characterized in that the compressed air of 5 to 7 atm.

Images