Wet sprayer for spraying concrete

Abstract

The utility model discloses a wet sprayer for spraying concrete, which comprises a first access pipeline connected with an external concrete delivery pipe, a second access pipeline and a third access pipeline connected with an external liquid accelerator delivery pipe, and a mixing pipeline arranged among the first access pipeline, the second access pipeline and the third access pipeline, a spraying outlet is formed in the bottom of the mixing pipeline; the second connecting-in pipeline and the third connecting-in pipeline are arranged on the two sides of the mixing pipeline respectively, and liquid air diffusers are arranged in the second connecting-in pipeline and the third connecting-in pipeline; and a flow divider is arranged in the mixing pipeline. According to the utility model, the inside of the spray head is improved, and a rotary mixing mode is adopted, so that an accelerator and concrete can be mixed more uniformly.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction, and particularly relates to a wet nozzle for spraying concrete. Background Art

[0002] Shotcrete is a construction method that uses a pressure-controlled spray gun to apply fine-grain concrete. It is commonly used to construct tunnel linings, thin-walled structures such as walls and ceilings, or other structural linings, as well as protective layers for steel structures. Shotcrete construction techniques primarily include dry and wet spraying.

[0003] In dry shotcrete, aggregate, cement, and accelerator are first dry-mixed in a specific proportion and then loaded into a sprayer. Compressed air is used to suspend the dry aggregate in a hose and pressurize it to the spray gun. At the nozzle, the dry aggregate is mixed with high-pressure water and sprayed at a high velocity onto the rock face or other construction surface. The advantages of dry shotcrete are that the equipment used is relatively simple, easy to operate and maintain, and the overall construction cost is relatively low.

[0004] The wet spraying method involves mixing cement, sand, stone, fine aggregate, water, and admixtures in a specific proportion (typically a water-cement ratio of approximately 0.5). The concrete is then pumped to a nozzle using a pump or compressed air, mixed with a liquid accelerator, and sprayed with high-pressure air. The advantage of wet spraying is that, compared to dry spraying, it produces significantly less dust during construction, which is beneficial for protecting the health of construction workers and improving the construction environment.

[0005] However, it also has certain disadvantages. The main one is that wet spraying is prone to pipe blockage. The main reason is that the accelerator cannot be mixed evenly. There is too much accelerator near the inner wall of the nozzle, while the accelerator in the middle part cannot be fully mixed with the concrete. In addition, due to the decay of pressure at the nozzle, the nozzle wall is gradually blocked. As a result, it cannot solidify quickly after spraying, which increases the rebound of the sprayed concrete during construction and increases the dust concentration, which seriously affects the construction environment. At the same time, it is easy to make the sprayed concrete uneven, affecting the spraying effect. Utility Model Content

[0006] The purpose of the utility model is to solve the above problems in the existing technology and propose a wet nozzle for shotcrete spraying, which improves the interior of the nozzle and adopts a rotating mixing method to make the quick-setting agent and concrete mixed more evenly.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows:

[0008] A wet nozzle for shotcrete spraying includes a first access pipe connected to an external concrete delivery pipe, a second access pipe and a third access pipe connected to an external liquid accelerator delivery pipe, a mixing pipe is provided between the first access pipe, the second access pipe and the third access pipe, and a spray outlet is provided at the bottom of the mixing pipe; the second access pipe and the third access pipe are respectively provided on both sides of the mixing pipe, and liquid diffusers are provided in the second access pipe and the third access pipe; a diverter is provided in the mixing pipe.

[0009] Furthermore, the diverter includes a pressure ring and a sleeve arranged at the lower part of the pressure ring, and a plurality of arc grooves are arranged on the inner wall of the sleeve.

[0010] Furthermore, the pressure ring is provided with a plurality of concrete inlets, and each concrete inlet is connected to one of the arc-shaped grooves.

[0011] Furthermore, the second access pipe and the third access pipe are connected to the upper part and the lower part of the pressure ring respectively.

[0012] Furthermore, a baffle is provided between the second access pipe and the mixing pipe, and between the third access pipe and the mixing pipe.

[0013] Furthermore, the liquid diffuser is conical.

[0014] Compared with the existing technology, the advantages of the present invention are as follows: First, the present invention uses two access pipes for connecting to the accelerator delivery pipe, which are respectively arranged above and below the pressure ring. The accelerator is added to the concrete at different times and positions, which can effectively improve the mixing effect between the concrete and the accelerator. Second, the present invention adopts an arc-shaped groove set in the sleeve, so that the concrete mixture changes direction and rotates in a spiral when passing through the pressure ring. When passing through the accelerator below, it can be further mixed, thereby improving the quality of the concrete and overcoming the problem that the accelerator cannot be fully mixed with the concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic structural diagram of a wet nozzle for shotcrete provided by the present invention;

[0017] Figure 2The utility model is a schematic structural diagram of a flow diverter of a wet nozzle for shotcrete.

[0018] Figure numerals: 1. first access pipe; 2. mixing pipe; 3. second access pipe; 4. third access pipe; 5. pressure ring; 6. sleeve; 7. liquid diffuser; 8. arc groove. DETAILED DESCRIPTION

[0019] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0021] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In addition, the terms "first", "second", "third", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0023] Furthermore, the use of terms such as "horizontal," "vertical," and "overhanging" does not necessarily imply that the component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0024] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0025] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention can be combined with each other.

[0026] like Figure 1-Figure 2 A wet nozzle for shotcrete includes a first access pipe 1 connected to an external concrete delivery pipe, a second access pipe 3 and a third access pipe 4 connected to an external liquid accelerator delivery pipe, and a mixing pipe 2 is arranged between the first access pipe 1, the second access pipe 3 and the third access pipe 4, and an injection outlet is arranged at the bottom of the mixing pipe 2; the second access pipe 3 and the third access pipe 4 are respectively arranged on both sides of the mixing pipe 2, and liquid diffusers 7 are arranged in the second access pipe 3 and the third access pipe 4; a diverter is arranged in the mixing pipe 2.

[0027] Compared to the existing technology, concrete spraying technology uses a concrete sprayer, powered by compressed gas or other means, to spray concrete onto the sprayed surface through a nozzle, allowing the concrete to quickly set and harden. The key to this technology lies in ensuring that the concrete is evenly mixed with the accelerator and air, and that the sprayed concrete is uniform, which has a significant impact on reducing concrete rebound and improving construction quality. However, in the existing technology, due to the inability to evenly mix the accelerator, excessive accelerator is present near the inner wall of the nozzle, while the accelerator in the middle cannot fully mix with the concrete. Furthermore, due to the pressure decay at the nozzle, the nozzle wall gradually becomes clogged. In contrast, the present invention employs two separate accelerator inlet pipes: a second inlet pipe 3 and a third inlet pipe 4. These two inlet pipes are connected to different locations. After passing through a diverter, the sprayed concrete undergoes a surface change, allowing more concrete to mix with the accelerator. At the same time, a liquid diffuser 7 is provided at the outlet of the second access pipe 3 and the third access pipe 4. Specifically, the liquid diffuser 7 is a conical rebounder provided in the middle of the outlet position, which is used to disperse the accelerator so that the accelerator is in the shape of water drops after being introduced, and can pass through the barrier net more safely and be mixed with the concrete more evenly and fully.

[0028] The diverter comprises a pressure ring 5 and a sleeve 6 disposed below the pressure ring 5. The inner wall of the sleeve 6 is provided with a plurality of arcuate grooves 8. The pressure ring 5 is provided with multiple concrete inlets, each connected to one of the arcuate grooves 8. The configuration of the pressure ring 5 allows the concrete to undergo a stable change in shape as it passes through the pressure ring 5 and sleeve 6, and is ejected in a spiral shape, thus overcoming the problem of reduced outlet pressure to a certain extent.

[0029] The second and third access pipes 3 and 4 are connected to the top and bottom of the pressure ring 5, respectively. Barrier nets are installed between the second access pipe 3 and the mixing pipe 2, and between the third access pipe 4 and the mixing pipe 2. By connecting the second and third access pipes 3 and 4 to different locations, the concrete and accelerator can be mixed more thoroughly.

[0030] The liquid diffuser 7 is conical in shape and disperses the high-pressure quick-setting agent liquid through the liquid diffuser to form more droplets, which can be mixed with concrete more effectively.

[0031] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A wet nozzle for shotcrete, characterized by: The invention comprises a first access pipe (1) connected to an external concrete delivery pipe, a second access pipe (3) and a third access pipe (4) connected to an external liquid quick-setting agent delivery pipe, a mixing pipe (2) being provided between the first access pipe (1), the second access pipe (3) and the third access pipe (4), and a spray outlet being provided at the bottom of the mixing pipe (2); the second access pipe (3) and the third access pipe (4) being provided on both sides of the mixing pipe (2), respectively, and liquid diffusers (7) being provided in the second access pipe (3) and the third access pipe (4); and a flow divider being provided in the mixing pipe (2).

2. The wet nozzle for shotcrete according to claim 1, characterized in that: The diverter comprises a pressure ring (5), a sleeve (6) arranged at the lower part of the pressure ring (5), and a plurality of arc-shaped grooves (8) are arranged on the inner wall of the sleeve (6).

3. The wet nozzle for shotcrete according to claim 2, characterized in that: The pressure ring (5) is provided with a plurality of concrete inlets, and each concrete inlet is connected to one of the arc-shaped grooves (8).

4. The wet nozzle for shotcrete according to claim 1, characterized in that: The second access pipe (3) and the third access pipe (4) are connected to the upper side of the pressure ring (5) and the lower side of the pressure ring (5) respectively.

5. The wet nozzle for shotcrete according to claim 4, characterized in that: Baffles are provided between the second access pipe (3) and the mixing pipe (2), and between the third access pipe (4) and the mixing pipe (2).

6. The wet nozzle for shotcrete according to claim 5, characterized in that: The liquid diffuser (7) is conical.

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