KR101630516B1 - Pipe for reducing dust of shotcrete, constructing system and constructing method using thereof - Google Patents

Abstract

The present invention relates to a shotcrete press molding part, a shotcrete construction system, and a shotcrete construction method using the same, for reducing injection dust and rebound dust at the time of construction of a shotcrete using a powder type quick-setting admixture. In order to achieve this, one side is connected to a press-feeding means for supplying concrete, and the other side is connected to a spraying portion for spraying concrete on the ground of a shotcrete installation, A quick-setting injection unit installed at an end of the pressure-feeding pipe and configured to inject powder-type quick-setting admixture into concrete to be fed by pressure; And a water spray part installed at a position closer to the spray part than the quick-setting injection part in the pressure-feeding pipe, and configured to spray water onto the concrete to be pressure-fed. According to this, the particles of the quick-setting admixture which have not been mixed into the concrete are sufficiently incorporated into the concrete, thereby reducing the amount of dust generated at the time of shotcrete injection and rebound.

Description

TECHNICAL FIELD [0001] The present invention relates to a shotcrete press-feeding part for reducing dust, a shotcrete construction system using the same, and a shotcrete construction method using the same. BACKGROUND ART [0002]

The present invention relates to a shotcrete press-feeding section, a shotcrete construction system and a shotcrete construction method using the same, and more particularly, to a shotcrete construction method and a shotcrete production method for reducing shot dust, And a shotcrete construction method using the same.

In recent tunneling and underground space construction, NATM (New Australian Tunneling Method) method, which injects shotcrete into the ground surface after excavation and stabilizes the ground surface, is mainly used. Shotcrete is a method of reinforcing the ground surface with excavation, rock bolt, etc., and injecting concrete onto it, which stabilizes the concrete. It uses a high speed construction equipment to mix the accelerator to reduce the condensation time of the concrete do. The concrete mixed with the powder type quick-setting admixture is sprayed on the ground using compressed air.

The role of shotcrete in construction of tunnels and underground spaces is as follows: ① Load distribution effect that distributes external force to the ground due to self-shear force resistance effect attached to the ground, ② Anti-decline effect to support collapse easily around the tunnel, ③ Resistant effect by bending compressive force and axial force to prevent the decrease of ground strength by applying internal pressure to the surrounding ground. ④ To prevent weathering of excavated surface, to prevent groundwater and fine particle leakage, .

Shotcrete methods using conventional liquid-phase quick-setting agents used in Korea have a problem in that they can not be expected to have durability due to a large amount of rebound and a large amount of material loss due to a slow initial coagulation speed, The accumulation of pollutants causes harm to the health of the workers, and increases the environmental pollution caused by the burden and leachate.

Accordingly, in order to replace the conventional liquid phase rapid setting method, a powder type cement mineral type quick-setting material having cement mineral as a main component has been developed. This powder type quick-setting agent can be remarkably improved in terms of durability, rebound excess, and environmental problems, which are problems in conventional liquid-phase quick-setting fastness, which are less harmful to the human body and are environmentally friendly and durable.

Such a powder type quick-setting admixture starts to harden when it comes into contact with water. Therefore, it is not possible to use a conventional shotcrete construction system using a liquid-phase quick-setting system in order to put in such powder-type rapid setting. In order to apply shotcrete using powder-type rapid setting, a shotcrete construction system is used in which a rapid setting agent is mixed with compressed air and injected into the concrete to be conveyed. The wet shotcrete installation using the powder type rapid setting method can be divided into two construction methods according to the pressure feeding method. In the concrete conveyance, the air is conveyed by compressed air continuously, and the pump is conveyed by pushing the concrete by two pistons similar to a concrete concrete pump car.

Patent No. 10-0875211 Patent No. 10-0647531

However, such a powder type quick-setting agent has a problem of generating more dust than a liquid-phase quick-setting agent. The supplied concrete begins to spread by encountering the primary compressed air, and the powder type quick-setting admixture is intercalated, and a lot of dust is generated at the time of spraying and rebounding. Since the inside of the tunnel is a closed space, generation of a large amount of dust becomes a serious problem.

Accordingly, the present invention has been made to solve the above-described problems.

The present invention relates to a shotcrete discharge tube for reducing dust, a shotcrete construction system, and a shotcrete construction method using the same. More particularly, the present invention relates to a shotcrete construction method for reducing shot dust and rebound dust during construction of a shotcrete using powder- A shotcrete conveyor system, a shotcrete construction system, and a shotcrete conveyor system, in which particles of accelerator which are not mixed with concrete are mixed into concrete by spraying a specific amount of water in a state where aggregate, concrete and quick- And a shotcrete construction method using the same.

A first object of the present invention is to provide a pressurized pipe which is connected to a pressurizing means for supplying concrete on one side and a spraying portion for spraying the concrete on a ground for a shotcrete installation, A quick-setting injection unit installed at an end of the pressure-feeding pipe and configured to inject powder-type quick-setting admixture into the concrete to be pressure-fed; And a water spray part installed at a position nearer to the jet part than the quick-setting injection part in the pressure feeding pipe, and configured to spray water onto the concrete to be pressure-fed. .

The water spraying portion may include a water supply pipe for supplying the water in a water tank for containing water; A chamber connected to the water supply pipe to receive the water and to surround the pressure supply pipe, the chamber having a space for receiving the water; And a nozzle connected to the chamber and the inside of the pressure-feeding pipe, and configured to spray the water to a specific pressure toward the inside of the pressure-feeding pipe.

The water spraying portion may include a water supply pipe for supplying the water in a water tank for containing water; A chamber connected to the water supply pipe to receive the water and to surround the pressure supply pipe, the chamber having a space for receiving the water; An injection hole which is a cylindrical hole connecting the chamber and the inside of the pressure feeding pipe; And an injection hole provided at an inlet of the injection hole, wherein the diameter gradually decreases toward the inside of the pressure transmission pipe, and the end is spaced apart from the inner surface of the pressure transmission pipe by a specific distance, And a nozzle configured to spray by pressure.

And a compressed air injection unit configured to inject compressed air into at least one of the quick-setting injection unit and the pressure transmission unit and between the quick-setting injection unit and the injection unit in the pressure-feeding pipe, ; ≪ / RTI >

In addition, the weight of the water sprayed by the water spraying portion corresponds to the weight of 1/40 to 1/10 of the weight of the water to be mixed with the concrete.

The spraying pressure of the water sprayed by the water spraying part may be more than 2 bar.

A second object of the present invention is to provide a press-feeding means for extruding concrete to a specific pressure; A shotcrete press-feeding unit according to claim 1, wherein the one side is connected to the press-feeding unit to press-convey the concrete; A powder supply unit for supplying a powdery acetic acid powder at a specific pressure to a quick-setting injection unit as a constituent of the shotcrete discharge unit; A water supply unit for supplying a predetermined pressure of water to the water spray part which is an integral part of the shotcrete discharge part; And a jetting part connected to the other side of the shotcrete press-feeding part and spraying the concrete to be pressure-fed onto the ground to be applied.

A pressurizing means for extruding the concrete to a specific pressure; A shotcrete press-feeding unit according to claim 3, wherein one side is connected to the press-feeding unit to press-convey the concrete; A compressed air supply unit for supplying compressed air at a specific pressure to the compressed air injection unit, which is a constitution of the shotcrete discharge unit; A powder supply unit for supplying a powdery acetic acid powder at a specific pressure to a quick-setting injection unit as a constituent of the shotcrete discharge unit; A water supply unit for supplying a predetermined pressure of water to the water spray part which is an integral part of the shotcrete discharge part; And a jetting part connected to the other side of the shotcrete press-feeding part and spraying the concrete to be pressure-fed onto the ground to be applied.

Further, it is also possible to use a pressure feeding means for extruding the concrete to a specific pressure; A shotcrete press-feeding unit according to claim 3, wherein one side is connected to the press-feeding unit to press-convey the concrete; A compressed air supply unit for supplying compressed air at a specific pressure to the compressed air injection unit, which is a constitution of the shotcrete discharge unit; A powder supply unit for supplying a powdery acetic acid powder at a specific pressure to a quick-setting injection unit as a constituent of the shotcrete discharge unit; A water supply unit for supplying a predetermined pressure of water to the water spray part which is an integral part of the shotcrete discharge part; And a spraying part connected to the other side of the shotcrete press-feeding part and spraying the concrete to be pumped to the work subject soil, wherein the concrete extruded by the press-feeding device is water- Can be produced by blending with less.

A third object of the present invention is to provide a concrete supplying step of supplying the concrete to the shotcrete press-feeding part according to the first aspect in which the press-feeding means extrudes the concrete at a specific pressure, A powder type quick-setting admixture step of injecting a powder-type rapid setting agent into the concrete which is fed by the quick-setting injection section in the shotcrete press-feeding section, thereby mixing the powder-type rapid setting agent into the concrete; Water spraying step spraying water onto the concrete pressed and fed in the shotcrete press-feeding part while the powder type fastening agent is mixed, thereby improving the mixing efficiency of the concrete and the powder type quick-setting agent; And a spraying step of spraying the concrete, which is pressure-fed while being mixed with the powder-type rapid setting agent, through a shotcrete press-feeding part connected to an end of the shotcrete press-feeding part, onto the ground to be applied. .

And injecting compressed air into the concrete compressed air injected by the shotcrete press-feeding unit after the concrete supplying step to mix the compressed air into the concrete and crushing the concrete .

Injecting compressed air to the concrete injected by the compressed air injection unit in the shotcrete press-feeding unit before the injection step, mixing the compressed air into the concrete and increasing the pressure of the concrete to be injected; And further comprising:

As described above, the present invention has the following effects.

First, according to one embodiment of the present invention, the particles of the quick-setting admixture which have not been mixed into the concrete are sufficiently mixed into the concrete, thereby reducing the amount of dust generated when the shotcrete is sprayed and rebounded.

Secondly, according to one embodiment of the present invention, the flow rate supplied from the water tank is calculated, and water corresponding to the weight of 1/40 to 1/10 of the weight of water supplied to the supplied concrete is sprayed, So that an optimum water content can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and, together with the description, And shall not be interpreted.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual diagram showing a shotcrete installation system including a press-
FIGS. 2A and 2B are cross-sectional views showing a longitudinal section of a press-feeding section according to an embodiment of the present invention,
FIGS. 3A and 3B are exploded perspective views showing a first injection portion, a third injection portion, and a water spray portion of the press-feeding portion according to an embodiment of the present invention;
FIGS. 4A and 4B are cross-sectional views illustrating a first injection unit and a third injection unit of the press-feeding unit according to an embodiment of the present invention;
FIGS. 5A and 5B are cross-sectional views showing a cross section of a first injection portion and a third injection portion of a press-feeding portion according to an embodiment of the present invention;
FIG. 6 is a perspective view illustrating a second injection unit of a press-feeding unit according to an embodiment of the present invention,
7 is a cross-sectional view illustrating a second injection unit of the press-feeding unit according to an embodiment of the present invention,
FIGS. 8A and 8B are cross-sectional views showing a water spraying portion of a press-feeding portion according to an embodiment of the present invention;
9A and 9B are cross-sectional views showing a cross section of a water spray portion of a pressure transfer portion according to an embodiment of the present invention,
10 is an enlarged view showing a nozzle of a water spraying portion according to an embodiment of the present invention,
11 is an enlarged view showing a nozzle of a water spraying portion according to an embodiment of the present invention,
12 is a block diagram showing a shotcrete construction method according to an embodiment of the present invention,
13 is a flowchart of a shotcrete construction method according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following detailed description of the operation principle of the preferred embodiment of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, it includes not only a case where it is directly connected but also a case where the other part is indirectly connected with another part in between. In addition, the inclusion of an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Shotcrete construction system

1 is a conceptual diagram showing a shotcrete installation system including a press-feeding part according to an embodiment of the present invention. 1, a shotcrete construction system 1 according to an embodiment of the present invention includes a concrete mixer 2, a press transfer section 3, a compressor 4, a powder supply section 5, a water tank 6, And a jetting section (7).

The ready-mixed concrete (2) is a construction for providing concrete to the press-feeding section (3). The ready mixer (2) provides concrete to the pressure feeding pump (30) of the press feeding section (3). Concrete supplied from the ready-mixed concrete 2 may be configured so that water is less mixed with the amount of water to be sprayed in the pressure-feeding section 3 than the general water blending ratio. More specifically, the concrete supplied from the ready-mixed concrete 2 may be configured so that 1/40 to 1/10 weight of water is less blended than the weight of the water to be blended.

The pressure feeding section 3 may include a pressure feeding pump 30, a first injection section 32, a second injection section 34, a third injection section 36 and a pressure feeding pipe 38. A press-feeding pump 30 is provided on one side of the press-feeding section 3 to receive and extrude the concrete provided in the ready-mixer 2 and to feed the concrete to the jetting section 7 provided on the other side of the press- . The concrete provided in the ready mixer 2 reaches the jetting section 7 through the feed pipe 38 and is sprayed on the ground to be constructed in the tunnel or underground space at the jetting section 7.

The pressure feeding pump 30 may be configured so that the concrete supplied from the ready mixer 2 is pushed to the jetting section 7 side by pushing the concrete with at least one piston.

The concrete is transported from the press-feeding pump 30 to the jetting unit 7 through the air-feeding pipe 38. The air, the powder, and the air are injected by the injection units 32, 34, Type quick-setting, water is mixed into the concrete to be fed. The compressed air is first introduced, the powdery acetic acid is mixed with the compressed air in the form of powder, and the compressed air can be mixed again before being sprayed. The water may be configured to be incorporated after the quick-setting admixture.

More specifically, in the first injection unit 32, compressed air may be mixed into the concrete. The second injection unit 34 may be configured to mix quick-setting and compressed air into the concrete. In the third injection unit 36, compressed air or compressed air and water may be mixed into the concrete. Or a separate injection unit for spraying water onto the concrete after the quick-setting admixture is mixed.

The compressor 4 may be configured to supply the compressed air to at least one of the first injection unit 32, the second injection unit 34, the third injection unit 36 and the powder supply unit 5. Preferably, the compressor 4 can supply the compressed air to the first injection portion 32, the third injection portion 36 and the powder supply portion 5.

The powder supply part 5 may be configured to supply powdered acupuncture to the second injection part 34. The powder supply unit 5 can receive the compressed air from the compressor 4 and transport the powdery acetic acid to the second injection unit 34 with compressed air.

In the case of using a powder type quick-setting admixture, since the powder type rapid setting agent is cured when it comes into contact with water, conventionally, water is sprayed onto the pressure feeding tube 38 of a shotcrete construction system using powder type quick- It was almost impossible to propose a shotcrete construction system which improves the mixing degree of the powder type rapid setting agent, and it was almost impossible to carry out. The reason for this is that it has been a problem to treat powdery acetic acid so as not to harden in the pressure feeding pipe 38 in the past.

According to the shotcrete construction system according to an embodiment of the present invention, when water is sprayed in a state where concrete and quick-setting agent are dispersed, particles of quick-setting agent which have not been mixed into concrete are sufficiently incorporated into concrete, There is an effect of reducing the amount of dust generated during the operation.

Shotcrete press-

2A and 2B are cross-sectional views showing a longitudinal section of a press-feeding section according to an embodiment of the present invention. As shown in FIGS. 2A and 2B, a first injection unit 32, a second injection unit 34, a third injection unit 36, a pressure feeding pipe (not shown) 38, and a water spray unit 100 may be provided.

The first injecting unit 32, the second injecting unit 34 and the third injecting unit 36 are connected between the press-feeding pipe 38 to supply the compressed air, At least one of them can be mixed into the concrete to be fed.

As shown in FIG. 2A, the water spraying unit 100 may be configured such that water is sprayed perpendicularly to the direction of the conveyance of the concrete, and water is sprayed in the direction of the conveyance of the concrete as shown in FIG. 2B . As shown in FIG. 2A, when water is sprayed perpendicularly to the direction of the conveyance of the concrete, water may be sprayed to the center of the cross section of the water spray part 100. When the water spray part 100 is constructed as shown in FIG. 2A, since most of the concrete particles come in contact with the water to be sprayed, the mixing efficiency of powder type quick-setting admixture can be improved.

With respect to the first injection portion 32, the first injection portion 32 can inject compressed air into the concrete to be pressure-fed. More specifically, the first injection part 32 may be configured to inject compressed air of a specific pressure before the quick-setting admixture is mixed with the concrete. The compressed air is injected into the concrete at the first injection part 32 before the powder type quick-setting admixture is mixed into the concrete, thereby finely crushing the concrete to be fed. The concrete to be fed is shredded finely so that the supply of the powder type quick-setting admixture to be supplied later becomes smooth, and the mixing efficiency of the powder type rapid setting agent is improved.

3A and 3B are exploded perspective views showing a first injection portion of a press-feeding portion according to an embodiment of the present invention, and FIGS. 4A and 4B are cross-sectional views of a first injection portion according to an embodiment of the present invention. 5A and 5B are cross-sectional views showing a cross section of a first injection portion of a press-feeding portion according to an embodiment of the present invention. As shown in FIGS. 3A, 3B, 4A, 4B, 5A, and 5B, at least one injection hole 3111 facing inward may be formed in the first injection portion 32. The number of the injection holes 3111 may be 5 to 15 or more. Compressed air can be injected through the entire periphery of the pipe by the injection hole 3111. [ The direction of the injection hole of the first injection part 32 may be configured so as to face the concrete pressure feeding direction, or may be configured to face the vertical direction of the concrete pressure feeding direction. In order to form at least one injection hole 3111 in the first injection part 32, the first injection part 32 may be formed in the form of a double pipe or may be constituted by at least one injection pipe. Such an injection hole may be constituted by a cylindrical hole having an overall diameter as a whole.

As a modified example of the first injection portion 32, a nozzle directed inward may be formed in the injection portion of the injection hole 3111 of the first injection portion 32. The compressed air can be injected through the entire circumference of the pipe by the nozzle. The direction of the nozzle of the first injection part 32 may be configured to face the concrete pressure feeding direction, or may be configured to face the vertical direction of the concrete pressure feeding direction. By configuring such a nozzle, the injection speed of the injected compressed air can be increased. Further, since the nozzle is formed at the introduction portion of the injection hole 3111 and is spaced apart from the inner surface of the feed pipe 38 by a specific distance, the outlet of the nozzle can be prevented from being blocked by the concrete.

With respect to the second injection unit 34, the second injection unit 34 may be configured to inject powdered acupuncture. In addition, the water spraying unit 100 may be configured on the spraying unit 7 side in the second injection unit 34 so that water is sprayed after the powdery acupuncture is injected. More specifically, in the second injection unit 34, the powder type quick-setting admixture may be injected into the concrete which is pressed and crushed by the compressed air to mix the powder type rapid setting and the concrete. Powder type quick-setting admixture is added to concrete to improve the adhesion to ground, and rapid curing accelerates the development of support strength.

6 is a perspective view showing a second injection unit of the press-feeding unit according to an embodiment of the present invention, and FIG. 7 is a perspective view of the second injection unit of the pressure-feeding unit according to an embodiment of the present invention. And Fig. As shown in FIGS. 6 and 7, the second injection unit 34 may include at least one injection pipe directed inward. This powder type quick-setting agent is supplied from the powder feeder 5 and is conveyed to the feed tube 38 by the compressed air provided by the compressor 4.

The concrete is hardened in the injection pipe of the second injection portion 34 and the concrete of the second injection portion 34 is injected into the injection pipe of the second injection portion 34. [ The second injection portion 34 may be formed so that the direction of the injection pipe of the second injection portion 34 is directed toward the concrete pressure feeding direction or the vertical direction of the concrete pressure feeding direction The second injection portion 34 can be formed. Or in order to improve the mixing efficiency of the concrete and the powder type rapid setting, the injection direction of the powder type rapid setting agent is shifted from the center axis of the tube.

Further, behind the second injection part 34, the water spray part 100 may further be provided to spray water onto the concrete to be pressure-fed. The water spraying unit 100 spray water on the concrete after the powder type quick-setting admixture is injected.

With respect to the third injection section 36, the third injection section 36 can inject compressed air into the concrete to be pressure-fed. More specifically, the first injection unit 32 may be configured to inject compressed air of a specific pressure before the concrete is injected into the ground. The concrete is injected with compressed air at a specific pressure before the concrete is injected to the ground to increase the pressure of the concrete injected from the jetting part 7 and to reduce the pulsation generated by the pressure feeding pump 30, Thereby increasing the mixing efficiency.

3A and 3B are exploded perspective views showing a third injection unit of the press-feeding unit according to an embodiment of the present invention, and Figs. 4A and 4B are views showing the third injection unit according to an embodiment of the present invention FIGS. 5A and 5B are cross-sectional views showing a cross section of a third injection portion of the press-feeding portion according to an embodiment of the present invention. As shown in FIGS. 3A, 3B, 4A, 4B, 5A, and 5B, at least one injection hole 3111 facing inward may be formed in the third injection unit 36. The number of the injection holes 3111 may be 5 to 15 or more. Compressed air can be injected through the entire periphery of the pipe by the injection hole 3111. [ The direction of the injection hole of the third injection part 36 may be configured so as to face the concrete pneumatic conveying direction or to be directed to the vertical direction of the concrete pneumatic conveying direction. In order to form at least one injection hole 3111 in the third injection part 36, the third injection part 36 may be formed in the form of a double pipe or may be constituted by at least one injection pipe. Such an injection hole may be constituted by a cylindrical hole having an overall diameter as a whole.

As a modified example of the third injection portion 36, a nozzle facing inward may be formed in the injection portion of the injection hole 3111 of the third injection portion 36. The compressed air can be injected through the entire circumference of the pipe by the nozzle. The direction of the nozzle of the third injection part 36 may be configured to face the concrete pneumatic conveying direction or to be directed to the vertical direction of the concrete pneumatic conveying direction. The injection speed of the injected compressed air can be increased by constituting the nozzle at the inlet of the injection hole 3111. Further, since the nozzle is formed at the introduction portion of the injection hole 3111 and is spaced apart from the inner surface of the feed pipe 38 by a specific distance, the outlet of the nozzle can be prevented from being blocked by the concrete.

Can be configured to be positioned between the second injection portion 34 and the third injection portion 36 or between the third injection portion 36 and the injection portion 7 in relation to the water spray portion 100 . The water spraying unit 100 may be configured to spray water at a specific pressure to the concrete that is pressure-fed after the powder type rapid setting is incorporated. As the water is sprayed in the state where the concrete and the rapid setting agent are scattered, the particles of the quick-setting admixture which are not mixed into the concrete are sufficiently mixed into the concrete, thereby reducing the amount of dust generated at the time of shotcrete injection and rebounding. The water spray unit 100 is connected to the water tank 6 and supplies water to the water spray unit 100 by an electric pump or a hydraulic pump or the compressed air of the compressor 4, Water can be supplied to the water spraying part 100.

8A and 8B are cross-sectional views showing a water spraying portion of a press-feeding portion according to an embodiment of the present invention. Figs. 9A and 9B are views showing a water spraying portion Sectional view showing a cross-section of a portion of the first embodiment of the present invention. As shown in FIGS. 8A, 8B, 9A and 9B, at least one injection hole 3111 and a nozzle 315 facing inward can be formed in the water spray part 100. [ The number of injection holes in which the nozzles 315 are provided in the water spraying unit 100 may be 4 to 5 or more. Water can be sprayed from the entire circumference of the pipe by the nozzle 315. The direction of the nozzle 315 of the water spraying section 100 may be configured to face the vertical direction of the concrete pneumatic conveying direction as shown in Figs. 8A and 9A, or to be directed to the concrete pneumatic conveying direction as shown in Figs. 8B and 9B Lt; / RTI >

8A and 9A with respect to the direction of the nozzle 315 formed at the inlet portion of the injection hole 3111 of the water spray portion 100 as shown in FIG. Water may be sprayed to the cross-sectional center of the water spray part 100 when the water spray part 100 is constructed such that water is sprayed perpendicular to the direction of the conveyance of the concrete. When the water spray part 100 is constructed as described above, most of the concrete particles come into contact with the water to be sprayed, so that the mixing efficiency of the powder type quick-setting admixture can be improved.

8B and 9B with respect to the direction of the nozzle 315 formed at the inlet portion of the injection hole 3111 of the water spray portion 100 as shown in FIGS. In the case where the water spraying unit 100 is constructed in this way, an effect of preventing the pressure feeding flow of the concrete is not generated.

In order to form at least one or more nozzles in the water spray unit 100, the water spray unit 100 may be configured in the form of a double tube, or may be constituted by at least one injection tube.

It is preferable that the water spraying section 100 is constructed so that water can be sprayed from the entire circumference of the pipe using a double pipe. It is also preferred that the nozzle be configured so that water can be sprayed in the form of a fog. When the water is sprayed on concrete conveyed in the form of fog, it is possible to achieve the object according to the embodiment of the present invention in such an amount that the amount of water in the concrete mixture does not need to be controlled.

10 is an enlarged view showing a nozzle of a water spraying portion according to an embodiment of the present invention. 10, since the nozzle 315 is formed at the inlet of the injection hole 3111 and is spaced apart from the inner surface of the feed pipe 38 by a specific distance, the outlet of the nozzle is closed by the concrete Can be prevented. More specifically, since the outlet of the nozzle is configured to have a smaller sectional area than the outlet of the injection hole 3111, in order to prevent clogging of the outlet by the flowing concrete, the outlet of the nozzle is not contacted with the inner surface of the pressure- .

11 is an enlarged view showing a nozzle of a water spraying portion according to an embodiment of the present invention. As shown in FIG. 11, the nozzle 315 may be independently formed on the inner wall of the feed pipe 38 while excluding the injection hole 3111. In the case where the nozzle 315 is formed directly on the inner wall of the pressure feed pipe 38 without being formed in the inlet portion of the injection hole 3111, the manufacturing cost of the water spray portion 100 is reduced. However, There is a possibility that occlusion of the ventricles may occur.

The water tank 6 may further include an inverter to calculate the amount of water supplied from the water tank 6 so that the amount of water supplied to the water spraying unit 100 can be adjusted in various stages. The shotcrete sprayed by the inverter can be configured to provide optimal water mixing. An apparatus for supplying water from the water tank 6 to the water spraying unit 100 may be an electric pump such as an inverter as well as a hydraulic pump.

More specifically, the concrete supplied from the ready-mixed concrete 2 may be configured so that 1/40 to 1/10 weight of water is less mixed than the weight of the water to be blended, and generally 1 / 40 to 1/10 of water may be sprayed. According to the internal test by the applicant of the present invention, when the amount of water sprayed by the water spraying portion 100 exceeds 1/10 of the weight of water contained in the concrete, the concrete to be fed is too hardened, And the amount of water to be sprayed is less than 1/40 of the weight of water contained in the concrete, it is confirmed that dust is still generated. Generally, when shotcrete is applied, 1 cubic meter of concrete is sprayed between 4 minutes 20 seconds and 5 minutes. Therefore, if 200 kg of water is mixed with 1 cubic meter of concrete, it is preferable that the amount of water sprayed from the water spraying part is set to be about 5 to 20 kg during 4 minutes 20 seconds to 5 minutes.

It was confirmed that the injection efficiency of the water was improved most remarkably at the pressure of the pressed concrete. When the jetting pressure of the water is lower than the pressure of the concrete to be fed, it is difficult to inject water into the concrete to be fed, so that the mixing efficiency of the concrete and powder type quick-setting can not be sufficiently improved. The pressure of the pressed concrete corresponds to about 2 bar to 3 bar.

If the spray pressure of the water is too high, such as 4 bar or more, it is difficult to control the amount of sprayed water, so that the water content ratio of the shotcrete may be changed, so that there is a possibility that shotcrete characteristics to be sprayed may be changed.

The injection unit 32, 34, 36 and the water spray unit 100 according to an embodiment of the present invention are formed in a double pipe structure as in FIGS. 3A, 3B, 4A, 4B, 5A, 5B, 8A, 8B, 9A, Or may be configured in the form of a single tube in which the injection tube is directly connected to the tube as shown in Figs. More preferably, the second injection unit 34 in which the powder type quick-setting agent is injected has a relatively wide injection port, and the first injection unit 32, the second injection unit 32, (36), and the water spray part (100), a nozzle may be provided in the injection hole. The second injection portion 34, the third injection portion 36, and the water spray portion 100 may be integrally formed.

3A and 3B, a body 300 coupled to the pressure-feeding pipe 38 is coupled to the outside of the body 300 to receive compressed air or water, And a casing 310 serving as a chamber for uniformly injecting compressed air or water. The casing 310 is provided with at least one injection pipe 321 connected to the compressor 4 or the water tank 6 to receive compressed air or water. The body 300 is provided with a ring-shaped injection ring 311 through which compressed air or water is injected. The body 300 also includes a casing coupling portion 312 coupled to the casing 310. Also, a body is provided with a press-feeding pipe coupling part 313 to be coupled with the pressure feeding pipe 38. The body also has a chamber groove 314 formed along the circumference thereof and serving as a chamber for compressed air or water. At least one injection hole 3111 is formed in the injection ring 311 so that compressed air or water is discharged to the pressure feed pipe 38. A nozzle may be formed at the inlet of the injection hole 3111.

The injection hole 3111 may be formed so as to face the central axis of the pipe and to be directed in a direction perpendicular to the pressure-feeding direction of the concrete. In this case, compressed air or water may be delivered to the center of the concrete to be fed.

According to a modification of the present invention, the injection hole 3111 may be formed so as to face the central axis of the pipe and to face the direction of the conveyance of the concrete. In this case, there is an effect that the compressed air or water does not hinder the press-feeding flow of the concrete.

According to a modification of the present invention, the injection hole 3111 may be formed in a direction not directed to the central axis of the pipe so that the concrete pressed and pushed when the compressed air or water is injected is rotated. When the pressed concrete is rotated when the compressed air or water is injected, the mixing efficiency of the powder type accelerator and the concrete is improved.

In the case of a single tube type, as shown in FIGS. 6 and 7, the injection tube 340 may be coupled to the body 330 to have a Y-shape. In the case of a single-tube-type injection unit in which powder-type rapid-setting is injected, the end of the injection tube may not be formed in the shape of a nozzle but may be formed of a rectangular tube having a rectangular cross section.

According to the shotcrete transfer tube according to one embodiment of the present invention, water is sprayed in a state where the concrete and the quick-setting agent are dispersed, and the particles of the quick-setting admixture which have not been mixed into the concrete are sufficiently mixed into the concrete, There is an effect of reducing the amount of dust generated during the operation.

Shotcrete construction method

FIG. 12 is a block diagram showing a shotcrete construction method according to an embodiment of the present invention, and FIG. 13 is a flowchart of a shotcrete construction method according to an embodiment of the present invention. As shown in FIGS. 12 and 13, a shotcrete construction method according to an embodiment of the present invention includes a concrete supply step S10, a compressed air injection step S20, a powdered quick-setting injection step S30, a water injection step S40), a compressed air injection step (S50), and a concrete injection step (S60).

In concrete supplying step S10, concrete is manufactured by mixing cement, fine aggregate, coarse aggregate, water, steel fiber, fluidizing agent, and the like in a plant plant, and then transported to a shotcrete installation apparatus using a concrete mixer. The conveyed concrete is supplied to the pressure feeding pump, and the pressure feeding pump 30 presses the concrete to the jetting part 7 through the pressure feeding pipe 38. In the pressure feeding pump 30, generally, two pistons are used to press the concrete. According to the method of applying shotcrete according to an embodiment of the present invention, concrete can be manufactured so that the amount of water to be sprayed by the water spray part 100 is less than that of water supplied to the concrete.

In the compressed air injection step (S20), compressed air is injected before the powder type acupressure is injected. The compressed air is injected into the concrete at the first injection part 32 before the powder type quick-setting admixture is mixed into the concrete, thereby finely crushing the concrete to be fed. The concrete to be fed is shredded finely so that the supply of the powder type quick-setting admixture to be supplied later becomes smooth, and the mixing efficiency of the powder type rapid setting agent is improved.

In the powder type quick-setting injection step (S30), powdered quick-setting material is injected after the compressed air is injected and the pressed concrete is finely crushed. In the second injection unit 34, the powder type quick-setting admixture may be injected into the concrete which is pressed and crushed by the compressed air so that the powder type rapid setting and the concrete are mixed. Powder type quick-setting admixture is added to concrete to improve the adhesion to ground, and rapid curing accelerates the development of support strength.

In the water injecting step (S40), a specific amount of water is sprayed to the concrete after the powder type acetic acid is mixed with a specific pressure. As the water is sprayed in the state where the concrete and the rapid setting agent are scattered, the particles of the quick-setting admixture which are not mixed into the concrete are sufficiently mixed into the concrete, thereby reducing the amount of dust generated at the time of shotcrete injection and rebounding. The water spray unit 100 is connected to the water tank 6 and supplies water to the water spray unit 100 by an electric pump or a hydraulic pump or the compressed air of the compressor 4, Water can be supplied to the water spraying part 100.

In the compressed air injection step (S50), compressed air is injected before the pressure-fed concrete is injected by the jetting section (7). The concrete is injected with compressed air at a specific pressure before the concrete is injected to the ground to increase the pressure of the concrete injected from the jetting part 7 and to reduce the pulsation generated by the pressure feeding pump 30, Thereby increasing the mixing efficiency.

In the concrete injection step S60, the pressure-fed concrete is sprayed to the ground of the shotcrete application by the jetting part 7 at a specific pressure. The mixing efficiency of the powder type quick-setting admixture is improved by the shotcrete installation system and the conveyance pipe according to an embodiment of the present invention, and the generation of dust is reduced during the injection and the rebound.

In the above description, the feed pipe 38 and the injection sections 32, 34, 36 and the water spray section 100 are separately connected and the feed pipe 38 is connected to the first injection section 32, the second injection section 34, 34 and 36 and the water spraying section 100 are connected to both ends of the third spraying section 36 and the water spraying section 100. However, As shown in FIG.

In the above description, compressed air injection, powder type quick-setting injection, and compressed air injection have been described in order. However, the present invention is not limited to these embodiments. In the present invention, it is one of the technical features of the present invention that water spraying is performed after powder-type quick-setting injection.

As described above, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

1: Shotcrete construction system
2: Remicon
3:
4: Compressor
5: Powder supply part
6: Water tank
7:
30:
32: First injection part
34: Second injection part
36: Third injection part
38:
100: Water spray part
300: Body
310: casing
311: Injection ring
312: casing coupling portion
313:
314: chamber home
315: Nozzles
321: Injection tube
330: Body
340: Injection tube
3111: Injection hole

Claims (12)

The other side of which is connected to a spraying unit for spraying the concrete on the ground of the shotcrete installation target,
A quick-setting injection unit installed at an end of the pressure-feeding pipe and configured to inject powder-type quick-setting admixture into the concrete to be pressure-fed;
A water spraying unit installed between the quick-dispensing injection unit and the jetting unit in the pressure feeding pipe and configured to spray water onto the concrete to be pressure-fed; And
And a compressed air injection unit configured to inject compressed air into the concrete to be pressure-fed, the compressed air injection unit being disposed between the quick-dispensing injection unit and the jetting unit in the pressure feeding pipe,
The water spraying portion,
A water supply pipe for supplying the water in a water tank for containing water;
A chamber connected to the water supply pipe to receive the water and to surround the pressure supply pipe, the chamber having a space for receiving the water;
An injecting hole connecting the chamber and the inside of the pressure feeding tube, the injection hole being a cylindrical hole having the same diameter; And
Wherein the injection port is provided at an inlet portion of the injection hole and has a longitudinally narrowing end portion gradually progressively toward the inside of the pressure feeding tube and is spaced apart from the inner surface of the pressure feeding tube by a specific distance, A nozzle configured to spray the water to a specific pressure toward the nozzle;
Further comprising:
Wherein the end of the nozzle is configured to have a smaller sectional area than an outlet of the injection hole formed at the rear end.
delete delete delete The method according to claim 1,
Wherein the weight of the water sprayed by the water spraying portion corresponds to a weight of 1/40 to 1/10 of the weight of the water to be mixed with the concrete.
The method according to claim 1,
Wherein the spraying pressure of the water sprayed by the water spraying part is 2 bar or more.
Pressurizing means for extruding the concrete to a specific pressure;
A shotcrete press-feeding unit according to claim 1, wherein the one side is connected to the press-feeding unit to press-convey the concrete;
A powder supply unit for supplying a powdery acetic acid powder at a specific pressure to a quick-setting injection unit as a constituent of the shotcrete discharge unit;
A water supply unit for supplying a predetermined pressure of water to the water spray part which is an integral part of the shotcrete discharge part; And
A jetting portion connected to the other side of the shotcrete press-feeding portion and spraying the concrete to be pressure-fed onto the ground to be applied;
Wherein the shotcrete construction system comprises:
Pressurizing means for extruding the concrete to a specific pressure;
A shotcrete press-feeding unit according to claim 1, wherein the one side is connected to the press-feeding unit to press-convey the concrete;
A compressed air supply unit for supplying compressed air at a specific pressure to the compressed air injection unit, which is a constitution of the shotcrete discharge unit;
A powder supply unit for supplying a powdery acetic acid powder at a specific pressure to a quick-setting injection unit as a constituent of the shotcrete discharge unit;
A water supply unit for supplying a predetermined pressure of water to the water spray part which is an integral part of the shotcrete discharge part; And
A jetting portion connected to the other side of the shotcrete press-feeding portion and spraying the concrete to be pressure-fed onto the ground to be applied;
Wherein the shotcrete construction system comprises:
Pressurizing means for extruding the concrete to a specific pressure;
A shotcrete press-feeding unit according to claim 1, wherein the one side is connected to the press-feeding unit to press-convey the concrete;
A compressed air supply unit for supplying compressed air at a specific pressure to the compressed air injection unit, which is a constitution of the shotcrete discharge unit;
A powder supply unit for supplying a powdery acetic acid powder at a specific pressure to a quick-setting injection unit as a constituent of the shotcrete discharge unit;
A water supply unit for supplying a predetermined pressure of water to the water spray part which is an integral part of the shotcrete discharge part; And
A jetting portion connected to the other side of the shotcrete press-feeding portion and spraying the concrete to be pressure-fed onto the ground to be applied;
Lt; / RTI >
Wherein the concrete to be extruded by the pressure transmission means is produced by mixing water with less amount of the water provided by the water supply portion.
A concrete supplying step of supplying the concrete to the shotcrete press-feeding part according to the first aspect in which the press-feeding means extrudes the concrete at a specific pressure, and the concrete is pressure-fed;
A powder type quick-setting admixture step of injecting a powder-type rapid setting agent into the concrete which is fed by the quick-setting injection section in the shotcrete press-feeding section, thereby mixing the powder-type rapid setting agent into the concrete;
Water spraying step spraying water onto the concrete pressed and fed in the shotcrete press-feeding part while the powder type fastening agent is mixed, thereby improving the mixing efficiency of the concrete and the powder type quick-setting agent; And
A spraying step of spraying the concrete pumped with the powdery acetic acid settled through the shotcrete press-feeding part onto the ground to be applied, the injection part connected to the end of the shotcrete pumping part;
Wherein the method comprises the steps of:
11. The method of claim 10,
After the concrete supplying step,
A compressed air injection step of injecting compressed air into the concrete compressed and injected by the shotcrete press-feeding part, mixing the compressed air into the concrete, and crushing the concrete;
Further comprising the steps of:
11. The method of claim 10,
Prior to the injection step,
A compressed air injection step of injecting compressed air into the concrete pressed and pushed by the shotcrete press-piercing section, mixing the compressed air into the concrete, and increasing the pressure of the concrete to be injected;
Further comprising the steps of:

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