UHPC concrete jet spraying device

Abstract

The present invention discloses a UHPC concrete rotary jetting and breaking device, which includes a gradually changing diameter conveying pipeline, a rotary jet mixer and a venturi nozzle; the rotary jet mixer includes a rotary jet mixing valve body and a rotary jet mixing valve core arranged in the rotary jet mixing valve body, the rotary jet mixing valve body is provided with a mixing groove and a mixing nozzle, the outer wall of the rotary jet mixing valve core is provided with a swirl channel that is at an angle to the axis of the rotary jet mixing valve core; the side wall of the rotary jet mixing valve core is provided with a high-pressure mixing air hole connecting the concrete channel and the swirl channel, and the inner wall of the rotary jet mixing valve core is provided with a circle of concrete flow control protection edge. The present application increases the contact range and breaking time of concrete with high-pressure air and quick-setting agent through the design and coordination of the swirl channel, flow control protection edge, mixing groove and high-pressure mixing air hole of the rotary jet mixer, promotes the concrete to be rotated, peeled and broken up and rotated sprayed, can fully break up ultra-high performance concrete, reduce the adhesion and pipe clogging of ultra-high performance concrete, and reduce the rebound of concrete spraying.

Description

Technical Field

[0001] The invention relates to the field of concrete spraying, in particular to a UHPC concrete rotary spraying and dispersion device. Background Art

[0002] Shotcrete support, a key process in tunnel and roadway support, is widely used in railways, highways, water conservancy, national defense, metallurgy, and other fields. Its working principle is to utilize fluid dynamics to transport ready-mixed concrete through pipelines and spray it at high speed onto the sprayed surface. The continuous impact and compaction of the concrete during the spraying process forms a concrete layer. As the most innovative cement-based engineering material in the past 30 years, UHPC (ultra-high performance concrete) has been gradually applied to bridges, buildings, tunnels, and special projects. Its principle is to optimize the combination of active and inert fillers through the principle of close packing to form a dense and uniform material matrix. Under extremely low water-cement ratios, the porosity caused by cement hydration is very low, forming a nearly impermeable matrix with extremely high durability, ultra-high mechanical properties, superior fluidity, and high viscosity.

[0003] Existing UHPC ultra-high performance concrete spraying devices all use conventional concrete sprayers. Their operating principle is still to use fluid power to transport ready-mixed concrete through pipelines and spray it at high speed onto the sprayed surface. The continuous impact and compaction of the concrete during the spraying process forms a concrete layer. However, UHPC ultra-high performance concrete has high plastic viscosity, yield stress, fluidity, and adhesion. Existing spraying devices are unable to break up the extremely viscous concrete or solve the problem of UHPC pipe hanging and blocking the spraying. Therefore, the spraying construction of ultra-high performance concrete is rarely involved. Therefore, the applicant has proposed a UHPC concrete rotary spraying and breaking device for UHPC ultra-high performance concrete spraying. Summary of the Invention

[0004] The invention provides a UHPC concrete rotary spraying and breaking-up device to solve the technical problem that the existing concrete spraying machine cannot break up ultra-high viscosity concrete.

[0005] According to one aspect of the present invention, a UHPC concrete rotary jetting and breaking-up device is provided, comprising a gradually changing diameter conveying pipeline, a rotary jetting mixer and a venturi nozzle; the input end of the conveying pipeline is used to input concrete and change the volume of concrete, and the output end of the conveying pipeline is used to connect with the rotary jetting mixer; the rotary jetting mixer comprises a rotary jetting mixing valve body and a rotary jetting mixing valve core arranged in the rotary jetting mixing valve body, the rotary jetting mixing valve body is provided with a mixing nozzle and a mixing groove for introducing a high-pressure airflow and a quick-setting agent, the outer wall of the rotary jetting mixing valve core is provided with a conical cavity, the conical cavity of the rotary jetting mixing valve core is provided with a swirl channel which is at an angle to the axis of the rotary jetting mixing valve core, and the high-pressure airflow entering from the mixing groove flows along the swirl channel The rotation of the rotary jet mixing valve core is used to apply a rotational thrust to the concrete, so that the concrete is rotated and peeled off layer by layer and broken up; a concrete channel for connecting to the output end of the delivery pipeline is formed axially in the rotary jet mixing valve core, a high-pressure mixing air hole connecting the concrete channel and the swirl channel is opened on the side wall of the rotary jet mixing valve core, and a flow control protection edge is provided on the inner wall of the rotary jet mixing valve core to prevent the concrete from flowing back to the high-pressure mixing air hole; a first mixing chamber connected to the concrete channel and the swirl channel is formed in the rotary jet mixing valve body for mixing concrete, high-pressure gas and accelerator; the Venturi nozzle is connected to one end of the rotary jet mixer away from the delivery pipeline, and a second mixing chamber for breaking up and mixing concrete, high-pressure air and accelerator is provided in the nozzle.

[0006] Optionally, a second mixing chamber and a straight-through cavity are formed in the nozzle, and the inner diameter of the second mixing chamber gradually decreases from one end close to the first mixing chamber to the end away from the first mixing chamber. The second mixing chamber is used for secondary mixing of concrete, accelerator and high-pressure air fluid, and the inner diameter of the straight-through cavity is consistent with the minimum inner diameter of the second mixing chamber.

[0007] Optionally, the swirl mixer valve core includes a high-pressure tail edge and an outer oblique cone, the high-pressure tail edge is circumferentially sealed with the inner wall of the swirl mixer valve body, the outer diameter of the outer oblique cone gradually decreases from the end close to the high-pressure tail edge to the end away from the high-pressure tail edge, and the swirl channel is arranged on the outer wall of the outer oblique cone.

[0008] Optionally, a sealing ring groove is circumferentially provided on the outer wall of the high-pressure trailing edge, and a dustproof sealing ring for cooperating with the rotary jet mixing valve body is provided in the sealing ring groove.

[0009] Optionally, a flow control protection edge is provided in the concrete channel of the rotary jet mixing valve core for preventing concrete from entering the high-pressure mixing air hole, and the flow control protection edge is located on a side of the high-pressure mixing air hole away from the first mixing chamber.

[0010] Optionally, the flow control protection edge is annular and surrounds the concrete flow channel of the rotary jet mixed flow valve core, and the inner diameter of the flow control protection edge gradually decreases from the side away from the high-pressure mixed gas hole to the side close to the high-pressure mixed gas hole.

[0011] Optionally, a valve core cone cavity for assembling the rotary jet mixing flow valve core is formed in the rotary jet mixing flow valve body, and the valve core cone cavity is a conical cavity with an inner diameter gradually decreasing from close to the delivery pipeline to away from the delivery pipeline.

[0012] Optionally, a flange is provided on the nozzle, and the flange is connected to the rotary jet mixer via a sealing ring and a clamp to fix the nozzle.

[0013] Optionally, an angle between a flow direction of gas in the high-pressure mixed gas hole and a flow direction of concrete in the rotary jet mixed flow valve core is an acute angle.

[0014] Optionally, the delivery pipeline is a gradually changing diameter delivery pipeline, and the delivery pipeline is connected to the rotary jet mixer through a clamp and a sealing rubber ring.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] 1. The rotary jet mixing valve core and the rotary jet mixing valve body rotate in coordination. After the high-pressure gas enters the swirl channel from the mixing groove, it will flow along the swirl channel. Because the swirl channel is set at an angle to the axis of the rotary jet mixing valve core, the high-pressure gas and atomized accelerator will be sprayed out along the swirl channel, causing the concrete, high-pressure air, and accelerator to be swirled and mixed in the rotary jet mixing valve body and the Venturi nozzle. This mixing area avoids the solidification and blockage of concrete in the rotary jet mixing valve core, increases the contact area and time between the concrete, high-pressure airflow, and accelerator, and thus achieves a better dispersion effect.

[0017] 2. The high-pressure airflow and accelerator enter the swirl channel and high-pressure mixing air hole of the valve core through the mixing nozzle and mixing groove on the rotary spray mixing valve body, and begin to mix with the concrete. The high-pressure airflow flows along the swirl channel, driving the concrete to rotate, increasing the rotational fluidity of the concrete, causing the concrete to spin and break up, and then mix with the accelerator and high-pressure air. The initially broken up mixture enters the second mixing chamber of the nozzle, where it is secondary mixed and accelerated by the tapered design of the chamber, making the concrete flow more refined and uniform.

[0018] 3. By setting the flow control protection edge, it can prevent the backflow of concrete from blocking the high-pressure mixing air holes, ensure that the flow direction and speed of concrete in the rotary spray mixing valve core are uniform, and improve the mixing effect.

[0019] 4. Through the gradually changing diameter delivery pipeline, the delivery volume and flow rate of concrete can be slowly changed, so that the cross-sectional area of ​​concrete passing through the rotary jet mixing valve core is reduced, and the concrete breaking capacity is improved; the concrete flow rate through the rotary jet mixing valve core is increased, and the residence time of concrete in the rotary jet mixer and Venturi nozzle is reduced, reducing the concrete clogging of the mixer and nozzle.

[0020] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 Schematic diagram of the cross-sectional structure of the UHPC concrete rotary grouting and dispersion device of the present invention;

[0023] Figure 2 Schematic diagram of the cross-sectional structure of the rotary jet mixer of the present invention;

[0024] Figure 3 This is a structural diagram of the rotary jet mixed flow valve core of the present invention;

[0025] Figure 4 Schematic diagram of the cross-sectional structure of the rotary jet mixed flow valve core of the present invention;

[0026] Figure 5 Schematic diagram of the cross-sectional structure of the rotary jet mixing valve body of the present invention;

[0027] Figure 6 This is a schematic structural diagram of the rotary jet mixing flow valve body of the present invention;

[0028] Figure 7 It is a schematic diagram of the cross-sectional structure of the nozzle of the present invention.

[0029] Legend:

[0030] 101. Gradual-diameter conveying pipeline; 102. Swirl-jet mixer; 103. Venturi nozzle; 201. Swirl-jet mixing valve core; 202. Swirl-jet mixing valve body; 301. Sealing ring groove; 302. High-pressure trailing edge; 303. Swirl channel; 304. High-pressure mixing gas hole; 305. Flow control protective edge; 306. Concrete flow channel; 307. External oblique cone; 401. Trailing edge cavity; 402. Mixing groove; 403. Valve core cone cavity; 404. Mixing nozzle; 405. Mixing through cavity; 501. Flange; 502. Second mixing cavity; 503. Straight-through cavity. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0032] The following is combined with Figure 1-7 This application is described in further detail.

[0033] The embodiment of the present application discloses a UHPC concrete rotary jetting and breaking-up device, which is used for rotary jetting and breaking-up of UHPC ultra-high performance concrete.

[0034] The common composition of shotcrete on the market is cement, sand, fine aggregate, coarse aggregate, water, and a water-reducing agent. The aggregate particle size ranges from 4 to 20 mm. The resulting concrete forms a paste-encased aggregate, with the smallest unit being approximately 20 mm in size. Aggregates bond together through colloids on their outer surfaces to form a concrete layer. Its setting strength depends primarily on the aggregates. Because of this, shotcrete typically has a dispersed distribution. Therefore, the commonly used shotcrete device only needs to disperse concrete particles up to 20 mm in size. This has led to the popular hollow cylindrical air-perforated mixer. Its operating principle is that the hollow channel inside the cylinder conveys concrete, while the 45-degree air holes on the surface of the cylinder flow the accelerator and high-pressure air. When the concrete at the center of the cylinder encounters the high-pressure air and accelerator delivered by the air holes, the concrete is directly dispersed and mixed. This structure has been tested and market-proven to effectively spray common aggregate concrete. UHPC (ultra-high performance concrete) is composed of multi-component cement, rheological colloid, fiber, fine sand, fly ash, silica fume, water-reducing agent, and water. Its principle is to optimize the combination of active and inert fillers through the principle of close packing to form a dense and uniform material matrix. Under extremely low water-cement ratios, the porosity caused by cement hydration is very low, forming a nearly impermeable matrix with a minimum component particle size of ≤2mm. It has high viscosity, high fluidity, and rapid solidification. Using the commonly used spray-dispersing technology on the market can lead to problems such as inability to disperse and fully mix the concrete, rapid concrete solidification, easy clogging of pipes and mixing holes, pancake-like distribution of the shotcrete, and muffled sound during the spraying process.

[0035] Reference Figure 1 The UHPC concrete rotary jetting and dispersion device includes a gradually changing diameter delivery pipeline 101, a rotary jet mixer 102, and a venturi nozzle 103. The input end of the gradually changing diameter delivery pipeline 101 is used to input concrete, and the output end of the delivery pipeline 101 is connected to the rotary jet mixer 102, stably and efficiently conveying the concrete from the input end to the rotary jet mixer 102; the rotary jet mixer 102 is used to achieve preliminary rotary mixing and dispersion of the concrete, high-pressure airflow, and accelerator; the nozzle 103 is connected to the end of the rotary jet mixer 102 away from the delivery pipeline 101, and is used to spray the dispersed concrete in a stable and concentrated manner.

[0036] Reference Figure 2 、 3Specifically, the rotary jet mixing device 102 includes a rotary jet mixing valve body 202 and a rotary jet mixing valve core 201 arranged in the rotary jet mixing valve body 202. The rotary jet mixing valve body 202 is provided with a mixing groove 402 for introducing a high-pressure airflow and a quick-setting agent. The outer wall of the rotary jet mixing valve core 201 is provided with a swirl channel 303 which is at an angle to the axis of the rotary jet mixing valve core 201. The high-pressure airflow entering from the mixing groove 402 flows along the swirl channel 303 and then applies thrust to the rotary jet mixing valve core to cause the rotary jet mixing valve core 201 to rotate. A concrete channel for connecting to the output end of the delivery pipeline 101 is formed axially in the rotary jet mixing flow valve core 201. A high-pressure mixing gas hole 304 is provided on the side wall of the rotary jet mixing flow valve core 201 to connect the concrete channel and the swirl channel 303. A first mixing chamber 405 connected to the concrete channel and the swirl channel 303 is formed in the rotary jet mixing flow valve body 202 for mixing concrete, high-pressure gas and accelerator. Specifically, the swirl channel 303 is evenly distributed on the outer oblique cone surface of the rotary jet mixing flow valve core 201 at a 10-degree angle. The high-pressure mixing gas hole 304 is evenly designed at the intersection of the middle of the oblique cone and the swirl channel 303, and its position is opposite to the mixing nozzle of the rotary jet mixing flow valve body 202. In a specific embodiment, two mixing grooves 402 are symmetrically arranged on both sides of the rotary jet mixing flow valve body 202, one for introducing high-pressure gas and the other for introducing accelerator.

[0037] The rotary jet mixing valve body 202 is the outer shell of the rotary jet mixer 102. It supports and protects the rotary jet mixing valve core 201 inside and provides a channel for introducing high-pressure airflow and accelerator. The mixing groove 402 is set on the channel of the rotary jet mixing valve body 202 and is used to introduce high-pressure airflow and accelerator. These fluids enter the swirl channel 303 of the rotary jet mixing valve core 201 through the mixing groove 402; the rotary jet mixing valve core 201 is the core component of the rotary jet mixer 102, which is responsible for mixing and breaking up the concrete, high-pressure airflow and accelerator; the swirl channel 303 guides the high-pressure airflow and accelerator to flow in a specific direction and applies a rotational force to the valve core to make it rotate; the high-pressure mixing air hole 304 is connected to the concrete channel, allowing the high-pressure airflow and accelerator to enter the concrete flow area for preliminary breaking up and mixing.

[0038] During operation, the high-pressure airflow and the accelerating setting agent enter the rotary spray mixing flow valve core 201 through the mixing flow groove 402 on the rotary spray mixing flow valve body 202, and the high-pressure airflow and the accelerating setting agent flow along the swirl channel 303. These channels are at an angle to the valve core axis, so that a rotational thrust is applied to the valve core during the fluid flow process. Under the guidance of the swirl channel 303, the thrust of the high-pressure airflow causes the rotary spray mixing flow valve core 201 to rotate. The rotating valve core forms a vortex effect in the swirl channel 303, which increases the contact area and time of the mixture. The high-pressure mixing air hole 304 introduces the high-pressure airflow and the accelerating setting agent into the concrete channel, mixes them in the valve core and performs preliminary dispersion.

[0039] The nozzle 103 includes a second mixing chamber 502 and a straight-through cavity 503. The inner diameter of the second mixing chamber 502 tapers from the end closest to the first mixing chamber 306 to the end further away from the first mixing chamber 306. The second mixing chamber 502 is used for secondary mixing of concrete, accelerator, and high-pressure air flow. The inner diameter of the straight-through cavity 503 coincides with the minimum inner diameter of the second mixing chamber 502. The second mixing chamber 502 achieves secondary mixing of concrete, accelerator, and high-pressure air flow by tapering its inner diameter from the end closest to the first mixing chamber 306 to the end further away from the first mixing chamber 306. This tapering inner diameter forces intense turbulence in the fluid as it passes through, further promoting uniform mixing and increasing the injection pressure, resulting in a more even and fine distribution of the concrete. The inner diameter of the straight-through cavity 503 is consistent with the minimum inner diameter of the second mixing chamber 502, ensuring that the flow velocity of the fluid remains unchanged after passing through the second mixing chamber 502, and can be sprayed out in a stable, clustered form, thereby improving the accuracy and effect of the spraying, reducing the rebound of concrete during the spraying process, and improving the construction quality. In order to achieve the best effect, the tapering angle and length of the second mixing chamber 502 need to be determined through experiments to ensure the best mixing effect and spraying pressure; at the same time, the length of the straight-through cavity 503 also needs to be designed according to the spraying requirements to ensure the stability of the flow beam. The entire nozzle 103 should be made of high-strength, wear-resistant materials, such as cemented carbide or ceramic-coated metal, and high-precision processing should be used to ensure the smoothness of the inner wall and the accuracy of the dimensions to avoid unstable factors in the fluid flow.

[0040] Reference Figure 3The valve core of the rotary jet mixer 102 includes a high-pressure tail edge 302 and an outer oblique cone 307. The high-pressure tail edge 302 is in circumferential sealing cooperation with the inner wall of the valve body of the rotary jet mixer 102. The outer diameter of the outer oblique cone gradually decreases from the end close to the high-pressure tail edge 302 to the end away from the high-pressure tail edge 302. The swirl channel 303 is arranged on the outer wall of the outer oblique cone. The high-pressure tail edge 302 is in circumferential sealing cooperation with the inner wall of the valve body of the rotary jet mixer 102 to ensure that the high-pressure airflow and the quick-setting agent do not leak when entering the rotary jet mixer 102, providing a stable pressure environment. The outer diameter of the outer oblique cone 307 gradually decreases from the end close to the high-pressure tail edge 302 to the end away from the high-pressure tail edge 302. This gradual contraction design makes the fluid velocity gradually increase when the high-pressure airflow and the quick-setting agent pass through, forming a strong rotating flow, which is conducive to the uniform mixing and breaking up of the concrete. The swirl channel 303 is arranged on the outer wall of the outer oblique cone 307. These channels are usually arranged at a certain angle to the axis of the valve core and are distributed in a spiral or inclined shape. They are designed to guide the high-pressure airflow to flow along a predetermined path and apply a rotational thrust to the valve core to cause the valve core to rotate. The rotating valve core forms a vortex effect in the swirl channel 303, increasing the contact area and time of the mixture, thereby achieving more complete mixing and breaking up. In the specific setting, the high-pressure tail edge 302 should be made of high-pressure resistant and wear-resistant materials to ensure that it is not easily worn after long-term use, and through precision processing, it is ensured to fit closely with the inner wall of the valve body. The tapered angle and length of the outer oblique cone 307 need to be determined through experiments to achieve the best fluid acceleration and rotation effect. The number, angle and shape of the swirl channel 303 also need to be optimized according to actual usage to ensure that the concrete, high-pressure airflow and quick-setting agent can be fully mixed, thereby improving the injection effect and construction quality. Through these precise designs and settings, the valve core of the entire rotary jet mixer 102 achieves an efficient mixing and breaking up process, significantly improving the effect of ultra-high performance concrete spraying construction.

[0041] A sealing ring groove 301 is circumferentially provided on the outer wall of the high-pressure trailing edge 302. A dustproof seal ring is located within this groove, which is designed to cooperate with the rotary jet mixing valve body 202. The primary function of this groove 301 and the dustproof seal ring within it is to ensure a tight seal between the high-pressure airflow and the accelerator between the high-pressure trailing edge 302 and the inner wall of the rotary jet mixing valve body 202, preventing any leakage of concrete, gas, or accelerator, thereby maintaining the internal high-pressure environment and fluid dynamic stability. By preventing external contaminants from entering the mixer, the seal ring also acts as a dustproof device, extending the service life of the rotary jet mixing valve 102.

[0042] Reference Figure 4A flow control protection edge 305 is provided within the concrete channel of the rotary jet mixing valve core 201 to prevent concrete from entering the high-pressure mixing air hole 304. The flow control protection edge 305 is located on the side of the high-pressure mixing air hole 304 away from the first mixing chamber 306. The main function of the flow control protection edge 305 is to prevent concrete from flowing back into the high-pressure mixing air hole 304 under high pressure, preventing concrete accumulation and blockage within the air hole. This ensures that the high-pressure airflow and accelerator can smoothly enter the mixing area, maintaining the stability and efficiency of the mixing process.

[0043] The flow control guard 305 is an annular ring surrounding the concrete flow path of the jet mixing valve core 201. Its inner diameter tapers from the side away from the high-pressure mixing air hole 304 to the side closer to the high-pressure mixing air hole 304. The primary function of the flow control guard 305 is to effectively guide the flow of concrete through its tapering inner diameter, creating a gradually tightening channel. This prevents high-pressure concrete from flowing backwards into the high-pressure mixing air hole 304, thereby preventing air hole blockage and concrete accumulation.

[0044] Reference Figure 5 and Figure 6 A valve core cone cavity 403 for assembling the rotary jet mixing flow valve core 201 is formed in the rotary jet mixing flow valve body 202. The valve core cone cavity 403 is a conical cavity with an inner diameter gradually decreasing from close to the delivery pipeline 101 to away from the delivery pipeline 101. The main function of the valve core cone cavity 403 is to guide and accelerate the flow of concrete, high-pressure airflow and quick-setting agent through its gradually decreasing conical design, so that they are gradually pressurized before entering the mixing area, thereby improving the kinetic energy and mixing effect of the fluid. In the specific setting, the inner wall of the valve core cone cavity 403 should be kept highly smooth to reduce the friction resistance and energy loss during the flow of the fluid, ensuring that the fluid can pass smoothly and quickly. A tail edge cavity 401 for assembling the high-pressure tail edge 302 is formed in the rotary jet mixing flow valve body 202.

[0045] The nozzle 103 is provided with a flange 501, which is connected to the rotary jet mixer 102 through a sealing ring and a clamp for fixing the nozzle 103. The main function of the flange 501 is to provide a stable and firm connection interface to ensure that the nozzle 103 can be reliably installed on the rotary jet mixer 102. At the same time, through the combination of the sealing ring and the clamp, an efficient sealing effect is achieved to prevent concrete, high-pressure airflow and quick-setting agent from leaking at the connection. When specifically set, the flange 501 should be made of high-strength, corrosion-resistant materials such as stainless steel or high-strength alloys to ensure long-term stability and durability under high pressure and high flow rate conditions. The sealing ring should be made of high-pressure resistant and wear-resistant materials such as fluororubber or polytetrafluoroethylene to ensure its sealing performance and service life under high pressure environments. The nozzle 103 is a Venturi nozzle 103, which controls the conveying volume and flow rate of ultra-high performance concrete so that the ultra-high performance concrete is fully dispersed by the high-pressure air.

[0046] The angle between the gas flow direction in the high-pressure mixing air hole 304 and the concrete flow direction in the rotary jet mixing valve core 201 is an acute angle. The design of the gas flow direction and the concrete flow direction at an acute angle helps to enhance the impact and shearing effect of the gas on the concrete, thereby increasing the mixing effect. During the specific setting, the position and angle of the high-pressure mixing air hole 304 need to be accurately calculated to ensure that the gas can enter the concrete flow path at the optimal angle. The acute-angled design of the air hole allows the high-pressure airflow to quickly cut into the concrete flow, causing the concrete to be violently disturbed and dispersed under the impact of the high-speed airflow, thereby improving the mixing efficiency and the breaking up effect.

[0047] Reference Figure 7 The delivery pipe 101 is a gradually changing diameter delivery pipe 101, which is connected to the rotary jet mixer 102 through a clamp and a sealing rubber ring. The main function of the gradually changing diameter delivery pipe 101 is to effectively adjust the flow rate and flow of concrete through gradually changing pipe diameter, so that it is gradually pressurized and accelerated before entering the rotary jet mixer 102, ensuring the smoothness and continuity of flow and preventing blockage and pulsation in high-pressure environments.

[0048] During the ultra-high performance concrete spraying operation, the swirl channel 303 and the high-pressure mixing air hole 304 of the swirl jet mixer 102 increase the contact range and the breaking time of the high-pressure air, the quick-setting agent and the concrete, increase the air volume of the high-pressure air, change the flow posture of the mixed fluid, avoid the solidification and backflow of the ultra-high performance concrete in the swirl jet mixing valve core 201, and enable the three to be fully mixed to form high-quality high-speed rotating atomized concrete; the delivery volume and flow rate of the ultra-high performance concrete are controlled by the gradually changing diameter pipeline and the nozzle 103, so that The ultra-high performance concrete is fully dispersed by the high-pressure air, and its high-speed flow characteristics can also ensure that the mixed initial setting concrete quickly passes through the rotary jet mixer 102 and the nozzle 103, and has the characteristics of not being easy to stick to the rotary jet mixer 102 and the nozzle, and can effectively solve the problems of wear and blockage of the inner walls of the rotary jet mixer 102 and the nozzle 103; in summary, the rotary jet dispersion device can improve the construction quality of the concrete wet spraying machine, reduce the rebound rate of concrete, increase the service life of the nozzle 103, prevent the nozzle 103 from being blocked and bursting, and ensure the safety of equipment and personnel.

[0049] Through experiments, it is proved that the particle size of ultra-high concrete is ≤2mm, the spraying form is mist, and the spraying process emits a "ssssss" sound; this patented design has the function of controlling the fluid movement posture, reaction time and reaction area, which increases the contact reaction time of concrete, accelerator and high-pressure air, prevents the initial setting and backflow of concrete in the mixer, reduces the adhesion and solidification of concrete to the pipeline, reduces the risk of pipe blockage, reduces the cleaning and replacement of the mixer and nozzle 103, reduces manual labor intensity, and improves the spraying efficiency and the quality of sprayed concrete.

[0050] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A UHPC concrete rotary grouting device, characterized by: It comprises a gradually changing diameter delivery pipeline (101), a rotary jet mixer (102) and a venturi nozzle (103); The input end of the gradually changing diameter delivery pipeline (101) is used for inputting concrete, and the output end of the gradually changing diameter delivery pipeline (101) is used for connecting to a rotary jet mixer (102) for conveying gradually changing diameter concrete so that the concrete is fully dispersed; the rotary jet mixer (102) comprises a rotary jet mixing valve body (202) and a rotary jet mixing valve core (201) arranged in the rotary jet mixing valve body (202); the rotary jet mixing valve body (202) is provided with a mixing groove (402) for introducing high-pressure airflow and quick-setting agent; the rotary jet mixing valve core (201) is provided with a swirl channel (303) at an angle to the axis of the rotary jet mixing valve core (201); the high-pressure airflow entering from the mixing groove (402) rotates along the swirl channel (303) and thereby applies a rotational thrust to the concrete, causing the concrete to be peeled off layer by layer and dispersed; A concrete flow channel (306) for connecting to the output end of the gradually changing diameter delivery pipeline (101) is formed in the axial direction of the rotary jet mixing flow valve core (201); a high-pressure mixing gas hole (304) communicating with the concrete flow channel (306) and the swirl channel (303) is provided on the side wall of the rotary jet mixing flow valve core (201); a first mixing cavity (405) connected to the concrete flow channel (306) and the swirl channel (303) is formed in the rotary jet mixing flow valve body (202) for initially breaking up and mixing concrete, high-pressure gas and quick-setting agent; A second mixing chamber (502) and a straight-through cavity (503) are formed in the Venturi nozzle (103); the inner diameter of the second mixing chamber (502) gradually decreases from an end close to the first mixing chamber (405) to an end away from the first mixing chamber (405); the second mixing chamber (502) is used for secondary mixing of concrete, quick-setting agent and high-pressure air fluid; the inner diameter of the straight-through cavity (503) is consistent with the minimum inner diameter of the second mixing chamber (502); The inlet end of the second mixing chamber (502) of the Venturi nozzle (103) is connected to the outlet end of the first mixing chamber (405) of the rotary jet mixer (102) to provide a second dispersion and mixing of concrete, high-pressure gas and quick-setting agent; the straight-through chamber (503) of the Venturi nozzle (103) is used to restrict the concrete spraying range.

2. The UHPC concrete rotary grouting and scattering device according to claim 1, characterized in that: The rotary jet mixing flow valve core (201) comprises a high-pressure trailing edge (302) and an outer oblique cone (307). The high-pressure trailing edge (302) is circumferentially sealed with the inner wall of the rotary jet mixing flow valve body (202). The outer diameter of the outer oblique cone (307) gradually decreases from an end close to the high-pressure trailing edge (302) to an end away from the high-pressure trailing edge (302). The rotary flow channel (303) is arranged on the outer wall of the outer oblique cone.

3. The UHPC concrete rotary grouting and scattering device according to claim 2, characterized in that: A sealing ring groove (301) is circumferentially provided on the outer wall of the high-pressure trailing edge (302), and a dustproof sealing ring for cooperating with the rotary jet mixing valve body (202) is provided in the sealing ring groove (301).

4. The UHPC concrete rotary grouting and scattering device according to claim 1, characterized in that: A flow control protection edge (305) for preventing concrete from entering the high-pressure mixed gas hole (304) is provided in the concrete channel of the rotary jet mixed flow valve core (201); the flow control protection edge (305) is located on a side of the high-pressure mixed gas hole (304) away from the first mixing cavity (405).

5. The UHPC concrete rotary grouting and scattering device according to claim 4, characterized in that: The flow control protection edge (305) is annular and surrounds the concrete flow channel of the rotary jet mixing valve core (201). The inner diameter of the flow control protection edge (305) gradually decreases from the side away from the high-pressure mixed gas hole (304) to the side close to the high-pressure mixed gas hole (304).

6. The UHPC concrete rotary grouting and scattering device according to claim 4, characterized in that: A valve core cone cavity (403) for assembling the rotary jet mixing flow valve core (201) is formed in the rotary jet mixing flow valve body (202). The valve core cone cavity (403) is a conical cavity with an inner diameter gradually decreasing from close to the delivery pipeline (101) to away from the delivery pipeline (101).

7. The UHPC concrete rotary grouting and scattering device according to claim 6, characterized in that: The venturi nozzle (103) is provided with a flange (501), and the flange (501) is connected to the rotary jet mixer (102) through a sealing ring and a clamp, and is used for fixing the nozzle (103).

8. The UHPC concrete rotary grouting and scattering device according to claim 1, characterized in that: The angle between the gas flow direction in the high-pressure mixed gas hole (304) and the concrete flow direction in the rotary jet mixed flow valve core (201) is an acute angle.

9. The UHPC concrete rotary grouting and scattering device according to claim 1, characterized in that: The delivery pipeline (101) is a gradually changing diameter delivery pipeline (101), which is connected to the rotary jet mixer (102) via a clamp and a sealing rubber ring, and is used for changing the diameter of the concrete volume.

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