An ECC concrete spraying device

Abstract

This utility model relates to the field of shotcrete construction equipment technology, specifically to an ECC concrete spraying device. Addressing the problems in existing ECC concrete spraying technology, such as fiber agglomeration and pipe blockage, slurry segregation, and uneven fiber distribution, which prevent the full utilization of ECC's high ductility and crack resistance advantages, this device includes a spraying pipe body and a spraying head. A central pressurized spraying core tube is concentrically arranged inside the spraying head, and the core tube is fixed to the inner wall of the spraying head by a connecting plate. A pressurized gas connector is located on the outside of the spraying head, and a pressurized gas passage is provided inside, connecting to the pressurized gas holes of the core tube. The core tube has a conical closed end, and the connecting plate can divide the material flow channel. This device can prevent fiber agglomeration and pipe blockage, suppress slurry segregation, optimize fiber distribution, fully utilize ECC performance, and is structurally reliable and easy to disassemble and maintain.

Description

Technical Field

[0001] This utility model relates to the field of shotcrete construction equipment technology, specifically to an ECC shotcrete spraying device. Background Technology

[0002] Traditional concrete pouring relies on formwork and a fixed working surface, making it unsuitable for construction scenarios involving high altitudes, confined spaces, or curved surfaces. Concrete spraying equipment, through high-pressure delivery, enables formwork-free construction, directly adhering concrete to the base surface, significantly simplifying the construction process, reducing costs, and improving efficiency.

[0003] ECC, or engineering cement-based composite material, is a special type of concrete with high toughness and crack resistance. It contains a large number of short fibers, such as PVA fibers and steel fibers, and its slurry viscosity is much higher than that of ordinary concrete. In existing spraying techniques, PE fibers and steel fibers easily interlock within the nozzle, forming fiber clusters that clog the flow channels. This leads to problems such as fiber agglomeration and pipe blockage, as well as slurry segregation, resulting in uneven fiber distribution after spraying. Consequently, the high ductility and crack resistance advantages of ECC cannot be fully utilized. Therefore, it is necessary to research an efficient, anti-clogging, and more uniform ECC concrete spraying device. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model proposes an ECC concrete spraying device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An ECC concrete spraying device includes a spraying pipe body and a spraying head. A central pressurized spraying core tube is concentrically arranged in the center of the spraying head. The central pressurized spraying core tube is fixedly connected to the inner wall of the spraying head through a plurality of connecting plates evenly distributed on the outer side. The outer wall of the injector is provided with a pressurized gas connector, which is used to connect to a high-pressure gas source through its gas pipe. The inner wall of the central pressurized injector core tube is provided with multiple pressurized gas holes. The injector, connecting plate and central pressurized injector core tube are provided with pressurized gas passages for connecting the pressurized gas connector and the multiple pressurized gas holes.

[0006] Preferably, the injection head has a pressurized gas chamber communicating with the pressurized gas connector, the connecting plates each have a pressurized branch gas channel communicating with the pressurized gas chamber, and the central pressurized injection core tube has a guiding gas channel corresponding to and communicating with the pressurized branch gas channel and the pressurized gas hole.

[0007] Preferably, the other end of the central pressurized jet tube away from the jet end is a closed end, the central pressurized jet tube is conical, and the closed end is the tip of the cone, which is used to guide the material and optimize the airflow direction.

[0008] Preferably, the spray head includes a connecting section, a conical section, and a spraying section, with the central pressurized spray core tube disposed in the conical section.

[0009] Preferably, the number of connecting plates and pressurizing air holes is set to 3 to 6. The connecting plates are used to fix the central pressurized injection core tube, distribute high-pressure gas, guide and divide the material flow channel.

[0010] Preferably, the injection pipe body and the injection head are threaded together.

[0011] Preferably, the injection head, connecting plate, and central pressurized injection core tube are integrally formed.

[0012] This utility model has at least the following beneficial effects: This invention introduces high-pressure gas into the injection channel by setting a central pressurized injection core tube inside the injection head, along with a pressurized gas passage and pressurized air holes. The high-pressure gas can disperse the ECC concrete slurry containing short fibers, breaking the tendency of the fibers to interlock and preventing fiber clumps from clogging the channel. At the same time, the central pressurized injection core tube is conical with a pointed closed end, which can guide the material to flow smoothly, optimize the airflow direction, reduce the retention and accumulation of material in the channel, and further reduce the probability of pipe blockage.

[0013] This invention utilizes the uniform dispersion effect of high-pressure gas and the segmentation and guidance of the material flow channel by the connecting plate to ensure that the short fibers in ECC concrete remain in a uniform suspended state during spraying, avoiding local enrichment or loss of fibers due to agglomeration. After spraying, the fibers can be evenly distributed on the surface of the base layer, allowing the high toughness and crack resistance inherent in the ECC material to be fully utilized, thus solving the problem of performance loss of ECC due to uneven fiber distribution in the prior art. Attached Figure Description

[0014] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0015] Figure 1 This is a schematic diagram of the overall disassembled structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the internal assembly structure of the nozzle.

[0017] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure along the AA direction.

[0018] The numbers in the above figures represent: 100, main body of the injection pipe; 200, injection head; 210, conical section; 211, pressurized air chamber; 220, material injection section; 230, connecting section; 240, central pressurized injection core tube; 241, guiding air passage; 242, pressurized air hole; 243, conical jet chamber; 244, tip; 250, connecting plate; 251, pressurized branch air passage; 260, pressurized gas connector. Detailed Implementation

[0019] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. To enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figures 1 to 3 An ECC concrete spraying device is presented, including a spraying pipe body 100 and a spraying head 200. The spraying pipe body 100 and the spraying head 200 are threadedly connected. A central pressurized spraying core tube 240 is concentrically arranged in the center of the spraying head 200. The central pressurized spraying core tube 240 is fixedly connected to the inner wall of the spraying head 200 through a plurality of connecting plates 250 evenly distributed on the outer side. The outer wall of the injector 200 is provided with a pressurized gas connector 260, which is used to connect to a high-pressure gas source through its gas pipe. The inner wall of the central pressurized injector core tube 240 is provided with a plurality of pressurized gas holes 242. The injector 200, the connecting plate 250 and the central pressurized injector core tube 240 are integrally formed structures, and the injector 200, the connecting plate 250 and the central pressurized injector core tube 240 are provided with pressurized gas passages for connecting the pressurized gas connector 260 and the plurality of pressurized gas holes 242.

[0021] The central pressurized airflow injected by the central pressurized injection core tube 240 can be pressurized again at the end of the ECC concrete spraying, which can not only improve the spraying efficiency and range, but also make the spraying effect better and prevent fiber clumps from clogging.

[0022] The specific design of the pressurized gas passage is as follows: A pressurized gas chamber 211 communicating with the pressurized gas connector 260 is provided inside the injection head 200; each connecting plate 250 has a pressurized branch gas channel 251 communicating with the pressurized gas chamber 211; and a guiding gas channel 241 corresponding to and communicating with the pressurized branch gas channel 251 and the pressurized gas hole 242 is provided inside the central pressurized injection core tube 240. The number of connecting plates 250 and pressurized gas holes 242 is preferably set to 3 to 6; in this embodiment, 4 are provided.

[0023] The connecting plate 250 serves the following functions: First, it connects and fixes the central pressurized injection core tube 240, rigidly connecting it to the inner wall of the injection head 200 to ensure that the central pressurized injection core tube 240 does not deviate during high-pressure delivery and maintains the stability of the coaxial flow channel. Second, it opens a pressurized branch air channel 251 within the plate to connect the pressurized air chamber 211 and the guiding air channel 241, serving as an intermediate hub between the pressurized air chamber 211 and the guiding air channel 241 to achieve uniform distribution of high-pressure gas. Third, it acts as a guide, making the injection direction and angle more stable and guiding the ECC concrete to flow smoothly along the gaps of the connecting plate 250. Fourth, the uniformly distributed connecting plate 250 can divide the material flow channel, dividing and physically breaking up the formed fiber clusters during the flow of ECC concrete, making the injection more uniform and reducing the risk of pipe blockage.

[0024] The spray head 200 includes a connecting section 230, a conical section 210, and a spraying section 220. The connecting section 230 is threaded to the spray pipe body 100 to ensure the sealing during ECC concrete transportation and facilitates subsequent disassembly, cleaning, or component replacement. The conical section 210 serves as a material transition area, allowing the ECC concrete to smoothly transition from the large diameter of the spray pipe body 100 to the small diameter of the spraying section 220, reducing material flow resistance and providing installation space for the central pressurized spraying core tube 240, forming a pipe-within-a-pipe flow channel. The spraying section 220 is the final spray outlet; by controlling the diameter to match construction requirements, it ensures the range and concentration of ECC concrete spraying and avoids excessive material diffusion.

[0025] The central pressurized jetting core tube 240 is located in the conical section 210. The central pressurized jetting core tube 240 is also configured as a cone shape adapted to the central pressurized jetting core tube 240, so that the ECC concrete and the high-pressure airflow flow coaxially along the conical surface, reducing material disturbance and avoiding slurry segregation.

[0026] The other end of the central pressurized injection core tube 240 away from the injection end is a closed end, which is a conical tip 244. The outer side can guide the material to concentrate towards the spray section 220, avoiding the accumulation of material at the rear end of the core tube and forming a blockage. The inner side forms a conical jet chamber 243, which can optimize the airflow direction and is more conducive to uniform injection.

[0027] The terms "upper," "lower," "outer," "inner," etc., used in the specification, claims, and accompanying drawings of this utility model, if present, are used to distinguish relative positional relationships and are not necessarily qualitative. It should be understood that such data can be interchanged where appropriate so that embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0028] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ECC concrete spraying device, comprising a spraying pipe body and a spraying head, characterized in that, A central pressurized injection core tube is concentrically arranged inside the injection head, and the central pressurized injection core tube is fixedly connected to the inner wall of the injection head through multiple connecting plates evenly distributed on the outer side. The outer wall of the injector is provided with a pressurized gas connector, which is used to connect to a high-pressure gas source through its gas pipe. The inner wall of the central pressurized injector core tube is provided with multiple pressurized gas holes. The injector, connecting plate and central pressurized injector core tube are provided with pressurized gas passages for connecting the pressurized gas connector and the multiple pressurized gas holes.

2. The ECC concrete spraying device as described in claim 1, characterized in that: The injector head has a pressurized gas chamber that communicates with the pressurized gas connector. Each connecting plate has a pressurized branch gas channel that communicates with the pressurized gas chamber. The central pressurized injector core tube has a guiding gas channel that communicates with the pressurized branch gas channel and the pressurized gas hole.

3. The ECC concrete spraying device as described in claim 1, characterized in that: The other end of the central pressurized jet tube away from the jet end is a closed end. The central pressurized jet tube is conical, and the closed end is the pointed tip of the cone, which is used to guide the material and optimize the airflow direction.

4. The ECC concrete spraying device as described in claim 1, characterized in that: The injection head includes a connecting section, a conical section, and a spraying section, with the central pressurized injection core tube disposed in the conical section.

5. The ECC concrete spraying device as described in claim 1, characterized in that: The number of connecting plates and pressurizing air holes is set to 3 to 6. The connecting plates are used to fix the central pressurized injection core tube, distribute high-pressure gas, guide and divide the material flow channel.

6. The ECC concrete spraying device as described in claim 1, characterized in that: The main body of the injection pipe and the injection head are threaded together.

7. The ECC concrete spraying device as described in any one of claims 1 to 6, characterized in that: The injection head, connecting plate, and central pressurized injection core tube are integrally formed.

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