Concrete conveying device suitable for large vertical drop distance and construction method

Abstract

The application discloses a concrete conveying device suitable for large vertical falling distance and a construction method, which comprises a concrete pumping vehicle, the concrete pumping vehicle is arranged on the ground and is connected with a vertical conveying pipe through a pumping connecting pipe, the vertical conveying pipe is fixed on the side wall of a vertical structure through a side wall fixing clamp, the tail of the vertical conveying pipe is connected with a concrete pouring operation pipe, and a plurality of self-rotating spiral chute structures are arranged on the vertical conveying pipe in an intermittent mode. The gravity potential energy of the pumped concrete fluid is converted into the self-rotating kinetic energy of the pipeline through the self-rotating spiral chute, the flow speed of the pumped concrete fluid in the pipeline can be slowed down, and thus the occurrence of phenomena such as aggregate segregation of the high-speed falling pumped concrete fluid and large-falling-distance impact can be effectively avoided, and the application is especially suitable for concrete pouring construction with extremely large vertical falling distance.

Description

Technical Field

[0001] This invention relates to a concrete conveying device and construction method suitable for large vertical drop distances, belonging to the technical field of concrete pouring construction equipment. Background Technology

[0002] In the structural pouring of long tunnels and ventilation shafts, concrete must overcome significant height differences during its pumping from the ground to the bottom of the shaft. Conventional concrete pumping pipes cannot effectively limit the acceleration of the pumped concrete as the drop increases. The high-speed descent of the pumped concrete can easily lead to problems such as aggregate segregation and rapid impact, adversely affecting the quality of the concrete pouring and construction safety. Since large vertical drop concrete pouring is relatively rare, there is currently a lack of effective solutions to these problems. Therefore, considering the flow characteristics of pumped concrete and the key points of concrete pumping pipe layout, providing a concrete conveying device for large vertical drop is of great practical significance. Summary of the Invention

[0003] Therefore, the object of the present invention is to provide a concrete conveying device and construction method suitable for large vertical drop distances, so as to at least solve the problems mentioned in the background art.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A concrete conveying device suitable for large vertical drop includes a concrete pump truck, which is set on the ground and connected to a vertical transport pipe through a pumping connection pipe. The vertical transport pipe is fixed to the side wall of a vertical structure by a side wall fixing clip, and its tail end is connected to a concrete pouring operation pipe. Several self-rotating spiral chute structures are intermittently arranged on the vertical transport pipe. The self-rotating spiral chute structures are used to provide a deceleration effect for pumping concrete fluid.

[0006] Furthermore, the aforementioned spin-type spiral chute structure includes an outer sleeve, which comprises a hollow steel cylinder. The upper end of the hollow steel cylinder is provided with an upper pipe connection port, and the lower end is provided with a lower pipe connection port. The upper pipe connection port is connected to the upper vertical transport pipe, and the lower pipe connection port is connected to the lower vertical transport pipe. An inner sleeve is rotatably connected inside the hollow steel cylinder via a rotatable connecting flange, and an inner spiral chute is provided inside the inner sleeve.

[0007] Furthermore, it also includes an outer spiral chute, with a cavity between the outer sleeve and the inner sleeve. The outer spiral chute is disposed in the cavity and is fixedly connected to the outer wall of the inner sleeve. A first port and a second port communicating with the cavity are respectively provided at the upper and lower ends of the hollow steel cylinder.

[0008] Furthermore, the aforementioned spin-type spiral chute structure includes an outer sleeve, an inner sleeve rotatably connected inside the outer sleeve, an inner spiral chute inside the inner sleeve, and an outer spiral chute outside the inner sleeve; the outer sleeve includes a hollow steel cylinder, with an upper pipe connection port and a first port at the upper end, and a lower pipe connection port and a second port at the lower end. The first and second ports are connected to the cavity between the outer sleeve and the inner sleeve. The upper pipe connection port is connected to the upper vertical transport pipe, and the lower pipe connection port is connected to the lower vertical transport pipe.

[0009] Furthermore, the inner sleeve includes a steel cylinder and an intermediate column, and the inner spiral chute is arranged in the gap between the steel cylinder and the intermediate column, and is fixedly connected to the intermediate column and the steel cylinder.

[0010] Furthermore, the diameter of the steel cylinder is greater than 1.3 times that of the vertical transport pipe, and the diameter of the intermediate column is less than 0.2 times that of the steel cylinder, to ensure the flow space for pumping concrete fluid; the inclination slope of the inner spiral chute is 50 to 60 degrees to ensure the flowability of pumping concrete fluid.

[0011] Furthermore, the outer spiral chute includes a sloping panel, a side plate, and a wire brush. One end of the sloping panel is welded to the outer side of the steel cylinder, and the other end is welded to the middle part of the side plate. The side plate is close to the inner wall of the hollow steel cylinder, with a small gap between them. The wire brush is fixed to the side plate as an isolation structure between the side plate and the hollow steel cylinder. The slope of the outer spiral chute is 25-30 degrees, and the sloping panel is provided with transverse grooves to improve the friction of the water flow on the outer spiral chute.

[0012] Furthermore, it also includes a pump, a high-pressure water supply pipe, and a high-pressure drainage pipe. The pump is detachably connected to the first port and the second port on the outer sleeve through the high-pressure water supply pipe and the high-pressure drainage pipe to form a closed-loop water circuit.

[0013] A construction method based on the aforementioned concrete conveying device suitable for large vertical drop heights includes the following steps:

[0014] Step S1: Arrange the concrete pump truck, pump connection pipe, vertical transport pipe, self-rotating spiral chute structure and concrete pouring operation pipe in an orderly manner, and prepare the pump, high-pressure water supply pipe and high-pressure drainage pipe for later use.

[0015] Step S2: Concrete pouring construction. Based on the concrete's fluidity, select the appropriate pouring method:

[0016] Normal pouring mode: The concrete pump truck pumps concrete into the inner sleeve. The impact and friction between the pumped concrete fluid and the inner spiral chute drive the self-rotating spiral chute structure to rotate, and the concrete pumping operation is carried out. At the same time, the workers operate the concrete pouring operation pipe to carry out the concrete pouring construction.

[0017] Forward-driven mode - concrete pouring construction: The high-pressure water supply pipe is connected to the first port and the high-pressure drainage pipe is connected to the second port. The pump then pressurizes the water flow in the forward direction, driving the self-rotating spiral chute structure to rotate in the forward direction to carry out concrete pumping operations. At the same time, workers operate the concrete pouring operation pipe to carry out concrete pouring construction.

[0018] Reverse resistance boosting mode - concrete pouring construction: Connect the high-pressure water supply pipe to the second port and the high-pressure drainage pipe to the first port. Then, the pump pressurizes the water flow in reverse, driving the self-rotating spiral chute structure to rotate in reverse to carry out concrete pumping operations. At the same time, workers operate the concrete pouring operation pipe to carry out concrete pouring construction.

[0019] As the structural pouring position changes, the vertical transport pipe and the self-rotating spiral chute structure are systematically spliced ​​and lengthened, and then step S2 is repeated for concrete pouring construction.

[0020] Step S3: After the concrete pouring is completed, clean the concrete pumping pipe and dismantle it in an orderly manner from bottom to top.

[0021] Furthermore, when the concrete has good fluidity, a reverse resistance-increasing mode is used for concrete pouring; when the concrete has moderate fluidity, a normal pouring mode is used for concrete pumping; and when the concrete has poor fluidity, a forward-push mode is used for concrete pouring.

[0022] Furthermore, in the above steps, if the concrete pumping pipe is partially blocked, a reverse resistance-increasing mode is performed - high-pressure flushing of the concrete pumping pipe: the high-pressure water supply pipe is connected to the second port, and the high-pressure drain pipe is connected to the first port, so that the pump pressurizes the water flow and drives the self-rotating spiral chute structure to rotate in the opposite direction; then, a high-pressure water gun is used to perform high-pressure water injection into the inner sleeve.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] (1) The present invention arranges a self-rotating spiral chute structure at a certain interval in the middle of the concrete pumping pipe, and then uses the mutual friction between the pumped concrete fluid and the self-rotating spiral chute structure to convert the downward kinetic energy of the pumped concrete fluid into the rotational kinetic energy of the self-rotating spiral chute structure. Without causing significant impact disturbance to the concrete pumping pipe, the downward speed of the pumped concrete fluid is effectively reduced, thereby avoiding the safety hazards caused by the rapid impact of concrete.

[0025] (2) By using a spin-type spiral chute structure to effectively decelerate the rapidly falling pumped concrete fluid, the falling speed of the pumped concrete fluid can be controlled within a reasonable range, thereby effectively avoiding the occurrence of concrete aggregate segregation.

[0026] (3) The self-rotating spiral chute structure can rotate in the forward direction under the drive of external power equipment. It can assist the pumping concrete fluid in sliding motion inside the self-rotating spiral chute structure when the flow of pumping concrete fluid is not smooth, thereby effectively preventing the occurrence of concrete pipe blockage.

[0027] (4) The self-rotating spiral chute structure can rotate in the opposite direction under the drive of external power equipment, thereby disrupting the natural downward movement of the pumped concrete fluid, achieving a better mechanical mixing effect, and further improving the uniformity between concrete aggregates.

[0028] (5) The reverse-rotating spin spiral chute structure can effectively improve the impact of the fluid inside the pipe on the wall of the spin spiral chute structure, and can effectively improve the flushing effect of the water flow on the spin spiral chute structure, which is beneficial to the cleaning of concrete pumping pipes.

[0029] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will now be described in further detail with reference to the accompanying drawings, wherein:

[0031] Figure 1 A structural schematic diagram of the concrete conveying device and construction method suitable for large vertical drop distance provided by the present invention;

[0032] Figure 2 This is a schematic cross-sectional view of the spin-type spiral chute structure provided in Embodiment 1 of the present invention;

[0033] Figure 3 for Figure 2 Schematic diagram of the structure of the inner and outer jacket;

[0034] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the inner sleeve;

[0035] Figure 5 This is a schematic cross-sectional view of the spin-type spiral chute structure provided in Embodiment 2 of the present invention;

[0036] Figure 6 for Figure 5 Schematic diagram of the structure of the inner and outer jacket;

[0037] Figure 7 for Figure 5 Schematic diagram of the structure of Chinese and foreign spiral chutes;

[0038] Figure 8 This is a flowchart of the working process of the spin spiral chute structure provided in Embodiment 3 of the present invention (forward push mode).

[0039] Figure 9 The flowchart of the working process of the spin spiral chute structure provided in Embodiment 3 of the present invention (reverse push mode).

[0040] In the diagram: 1. Concrete pump truck; 2. Pumping connection pipe; 3. Vertical transport pipe; 4. Side wall fixing clip; 5. Concrete pouring operation pipe; 6. Outer sleeve; 6.1. Hollow steel cylinder; 6.2. Upper pipe connection port; 6.3. Lower pipe connection port; 6.4. First port; 6.5. Second port; 7. Rotatable connection flange; 7.1. Fixed pipe connection base; 7.2. Rotatable pipe connection base; 7.3. Middle rotatable connection structure; 8. Inner sleeve; 8.1. Steel cylinder; 8.2. Middle column; 8.3. Inner spiral chute; 9. Outer spiral chute; 9.1. Sloping panel; 9.2. Side plate; 9.3. Wire brush; 10. Pump; 11. High-pressure water supply pipe; 12. High-pressure drainage pipe. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1

[0043] like Figure 1-4 As shown, a concrete conveying device and construction method suitable for large vertical drop height includes a concrete pump truck 1, which is set on the ground and connected to a vertical transport pipe 3 through a pumping connection pipe 2. The vertical transport pipe 3 is fixed to the side wall of a vertical structure by a side wall fixing clip 4, and its tail end is connected to a concrete pouring operation pipe 5. Several self-rotating spiral chute structures are intermittently set on the vertical transport pipe 3. The self-rotating spiral chute structures are used to provide a deceleration effect for pumping concrete fluid.

[0044] The described spin-type spiral chute structure includes an outer sleeve 6, within which an inner sleeve 8 is rotatably connected. The inner sleeve 8 contains an inner spiral chute 8.3. Specifically, the inner sleeve 8 has rotatable connecting flanges 7 at both ends, allowing it to rotate within the outer sleeve 6. During operation, pumped concrete fluid enters the inner sleeve 8 and impacts the inner spiral chute 8.3. The mutual impact and friction between the pumped concrete fluid and the inner spiral chute 8.3 converts the downward kinetic energy of the pumped concrete fluid into the rotational kinetic energy of the spiral chute structure. This allows the inner sleeve 8 to rotate freely under the influence of the concrete fluid, effectively slowing down the downward velocity of the pumped concrete fluid without causing significant impact or disturbance to the concrete pumping pipe.

[0045] The inner sleeve 8 includes a steel cylinder 8.1 and an intermediate column 8.2. The inner spiral chute 8.3 is arranged in the gap between the steel cylinder 8.1 and the intermediate column 8.2 and is fixedly connected to the intermediate column 8.2 and the steel cylinder 8.1.

[0046] The rotatable connecting flange 7 includes a fixed pipe connecting base 7.1, a rotatable pipe connecting base 7.2, and an intermediate rotatable connecting structure 7.3. The fixed pipe connecting base 7.1, the rotatable pipe connecting base 7.2, and the intermediate rotatable connecting structure 7.3 form a reliable pipe rotatable connecting structure with good sealing and waterproof performance. The fixed pipe connecting base 7.1 is connected to the upper pipe connecting port 6.2 or the lower pipe connecting port 6.3, and the rotatable pipe connecting base 7.2 is connected to the end of the inner sleeve 8.

[0047] In this embodiment, the outer sleeve 6 includes a hollow steel cylinder 6.1, an upper pipe connection port 6.2 and a lower pipe connection port 6.3. The upper pipe connection port 6.2 is connected to the upper vertical transport pipe 3, and the lower pipe connection port 6.3 is connected to the lower vertical transport pipe 3.

[0048] Example 2

[0049] Based on Example 1, combined with Appendix Figures 1-9 A concrete conveying device suitable for large vertical drop heights is provided. This device further includes an outer spiral chute 9, with a cavity between an outer sleeve 6 and an inner sleeve 8. The outer spiral chute 9 is disposed within the cavity and fixedly connected to the outer wall of the inner sleeve 8. The inner sleeve 8 and the outer spiral chute 9 can rotate within the outer sleeve 6 via a rotatable connecting flange 7. Applying external power to the outer spiral chute 9 can further drive the inner sleeve 8 to rotate, thereby providing a better concrete fluid pumping effect. Specifically, the external power can be a fluid, gas, etc., acting on the outer spiral chute 9. Specifically, using a substance that can provide external power, such as a fluid or gas, to impact the outer spiral chute 9 converts the impact kinetic energy into the rotational kinetic energy of the outer spiral chute 9.

[0050] In this embodiment, the outer sleeve 6 includes a hollow steel cylinder 6.1, an upper pipe connection port 6.2, a lower pipe connection port 6.3, a first port 6.4, and a second port 6.5. The first port 6.4 and the second port 6.5 are connected to the cavity between the outer sleeve 6 and the inner sleeve 8. The first port 6.4 and the second port 6.5 are respectively located at the upper and lower ends of the hollow steel cylinder 6.1. The upper pipe connection port 6.2 is connected to the upper vertical transport pipe 3, and the lower pipe connection port 6.3 is connected to the lower vertical transport pipe 3. The first port 6.4 and the second port 6.5 serve as fluid and gas connection ports, used to apply power to the outer spiral chute 9, driving the inner sleeve 8 to rotate.

[0051] The diameter of the steel cylinder 8.1 should be greater than 1.3 times that of the vertical transport pipe 3, and the diameter of the intermediate column 8.2 should be less than 0.2 times that of the steel cylinder 8.1 to ensure sufficient flow space for the pumped concrete fluid. The inclination slope of the inner spiral chute 8.3 should be relatively large, preferably controlled between 50 and 60 degrees, to ensure the flowability of the pumped concrete fluid. The diameter of the hollow steel cylinder 6.1 should be greater than 1.5 times that of the vertical transport pipe 3, making the diameter of the hollow steel cylinder 6.1 larger than that of the steel cylinder 8.1, thereby ensuring that a cavity is left between the outer sleeve 6 and the inner sleeve 8.

[0052] The external spiral chute 9 includes a sloping panel 9.1, a side plate 9.2, and a wire brush 9.3. One end of the sloping panel 9.1 is welded to the outer side of the steel cylinder 8.1, and the other end is welded to the middle part of the side plate 9.2. The side plate 9.2 is close to the inner wall of the hollow steel cylinder 6.1, with a small gap between them. The wire brush 9.3 is fixed on the side plate 9.2, serving as an isolation structure between the side plate 9.2 and the hollow steel cylinder 6.1, and its function is to prevent water flow from passing through the aforementioned gap. The slope of the external spiral chute 9 should be relatively small, controlled at around 25-30 degrees, and the sloping panel 9.1 is provided with transverse grooves to increase the friction of the water flow against the external spiral chute 9.

[0053] Example 3

[0054] Based on Examples 1 and 2, and in conjunction with the appendix Figures 1-9 A concrete conveying device suitable for large vertical drop heights is provided. The device also includes a pump 10, a high-pressure water supply pipe 11, and a high-pressure drainage pipe 12. The pump 10 is detachably connected to the first port 6.4 and the second port 6.5 on the outer sleeve 6 through the high-pressure water supply pipe 11 and the high-pressure drainage pipe 12 to form a closed-loop water circuit. Specifically, the detachable connection structure is a quick-connect coupling.

[0055] This embodiment can provide two operating modes:

[0056] Mode 1: Forward-driven mode, where the water flow pushes the outer spiral chute 9 in the same direction as the pumped concrete fluid pushes the inner spiral chute 8.3. This mode is suitable for situations where the pumped concrete fluid is too viscous, ensuring that the pumped concrete fluid does not clog the pipe. Specifically, the high-pressure water supply pipe 11 is connected to the first port 6.4 via a quick-connect coupling, and the high-pressure drain pipe 12 is connected to the second port 6.5, thereby pressurizing the water flow using the pump 10.

[0057] Mode 2: Reverse resistance boosting mode, where the direction of the water flow pushing the outer spiral chute 9 is opposite to the direction of the pumped concrete fluid pushing the inner spiral chute 8.3. This mode is suitable for situations where the consistency of the pumped concrete fluid is too low, or when there is partial blockage in the concrete pumping pipe, requiring high-pressure flushing. Specifically, the high-pressure water supply pipe 11 is connected to the second port 6.5 via a quick-connect coupling, and the high-pressure drain pipe 12 is connected to the first port 6.4, thereby pressurizing the water flow using the pump 10.

[0058] The construction method based on the above-mentioned concrete conveying device applicable to large vertical drop distances specifically includes the following steps:

[0059] Step S1: Arrange the concrete pump truck 1, pumping connection pipe 2, vertical transport pipe 3, side wall fixing clip 4, concrete pouring operation pipe 5 and self-rotating spiral chute structure in an orderly manner, and prepare the pump 10, high-pressure water supply pipe 11 and high-pressure drainage pipe 12 for later use.

[0060] Step S2: Concrete pouring construction. Based on the concrete's fluidity, select the appropriate pouring method:

[0061] Normal pouring mode: The concrete pump truck 1 pumps concrete into the inner sleeve 8. The impact and friction between the pumped concrete fluid and the inner spiral chute 8.3 drive the self-rotating spiral chute structure to rotate, and the concrete pumping operation is carried out. At the same time, the workers operate the concrete pouring operation pipe 5 to carry out the concrete pouring construction.

[0062] Forward push mode - concrete pouring construction: connect the high pressure water supply pipe 11 to the first port 6.4 and the high pressure drainage pipe 12 to the second port 6.5. Then the pump 10 pressurizes the water flow in the forward direction, driving the self-rotating spiral chute structure to rotate in the forward direction. Then the concrete pumping operation is carried out. At the same time, the workers operate the concrete pouring operation pipe 5 to carry out concrete pouring construction.

[0063] Reverse resistance boosting mode - concrete pouring construction: connect the high-pressure water supply pipe 11 to the second port 6.5 and the high-pressure drainage pipe 12 to the first port 6.4. Then the pump 10 pressurizes the water flow in the reverse direction, driving the self-rotating spiral chute structure to rotate in the reverse direction. Then the concrete pumping operation is carried out. At the same time, the worker operates the concrete pouring operation pipe 5 to carry out concrete pouring construction.

[0064] As the structural pouring position changes, the vertical transport pipe 3 and the self-rotating spiral chute structure are spliced ​​and lengthened in an orderly manner, and then step S2 is repeated to carry out concrete pouring construction.

[0065] Step S3: After the concrete pouring is completed, clean the concrete pumping pipe and dismantle it in an orderly manner from bottom to top.

[0066] In the above steps, when the concrete has good fluidity, the reverse resistance mode is used for concrete pouring; when the concrete has normal fluidity, the normal pouring mode is used for concrete pumping; and when the concrete has poor fluidity, the forward push mode is used for concrete pouring.

[0067] In the above steps, if the concrete pumping pipe is partially blocked, the reverse resistance-increasing mode is adopted - high-pressure flushing of the concrete pumping pipe: the high-pressure water supply pipe 11 is connected to the second port 6.5, the high-pressure drain pipe 12 is connected to the first port 6.4, and then the pump 10 pressurizes the water flow, driving the self-rotating spiral chute structure to rotate in the opposite direction; then the high-pressure water gun is used to perform high-pressure water injection into the inner sleeve 8.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments without departing from the technical solution of the present invention and based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A concrete conveying device suitable for large vertical drop, comprising a concrete pump truck (1), the concrete pump truck (1) being installed on the ground and connected to a vertical transport pipe (3) via a pumping connection pipe (2), the vertical transport pipe (3) being fixed to the side wall of a vertical structure via a side wall fixing clip (4), and its tail being connected to a concrete pouring operation pipe (5), characterized in that, Several self-rotating spiral chute structures are intermittently installed on the vertical transport pipe (3). The self-rotating spiral chute structures are used to provide a deceleration effect for pumping concrete fluid. The self-spinning spiral chute structure includes an outer sleeve (6), which includes a hollow steel cylinder (6.1). The upper end of the hollow steel cylinder (6.1) is provided with an upper pipe connection port (6.2), and the lower end is provided with a lower pipe connection port (6.3). The upper pipe connection port (6.2) is connected to the upper vertical transport pipe (3), and the lower pipe connection port (6.3) is connected to the lower vertical transport pipe (3). An inner sleeve (8) is rotatably connected inside the hollow steel cylinder (6.1) through a rotatable connecting flange (7). An inner spiral chute (8.3) is provided inside the inner sleeve (8). It also includes an outer spiral chute (9), with a cavity between the outer sleeve (6) and the inner sleeve (8). The outer spiral chute (9) is set in the cavity and is fixedly connected to the outer wall of the inner sleeve (8). A first port (6.4) and a second port (6.5) communicating with the cavity are respectively provided at the upper and lower ends of the hollow steel cylinder (6.1). It also includes a pump (10), a high-pressure water supply pipe (11) and a high-pressure drain pipe (12). The pump (10) is detachably connected to the first port (6.4) and the second port (6.5) on the outer sleeve (6) through the high-pressure water supply pipe (11) and the high-pressure drain pipe (12) to form a closed-loop water circuit.

2. The concrete conveying device suitable for large vertical drop distances according to claim 1, characterized in that, The inner sleeve (8) includes a steel cylinder (8.1) and an intermediate column (8.2). The inner spiral chute (8.3) is arranged in the gap between the steel cylinder (8.1) and the intermediate column (8.2) and is fixedly connected to the intermediate column (8.2) and the steel cylinder (8.1).

3. The concrete conveying device suitable for large vertical drop distances according to claim 2, characterized in that, The diameter of the steel cylinder (8.1) is greater than 1.3 times that of the vertical transport pipe (3), and the diameter of the intermediate column (8.2) is less than 0.2 times that of the steel cylinder (8.1) to ensure the flow space for pumped concrete fluid; the inclination slope of the inner spiral chute (8.3) is 50 to 60 degrees to ensure the flowability of pumped concrete fluid.

4. The concrete conveying device suitable for large vertical drop distances according to claim 1, characterized in that, The outer spiral chute (9) includes a ramp panel (9.1), a side plate (9.2), and a wire brush (9.3). One end of the ramp panel (9.1) is welded to the outer side of the steel cylinder (8.1), and the other end is welded to the middle part of the side plate (9.2). The side plate (9.2) is close to the inner wall of the hollow steel cylinder (6.1), with a small gap between them. The wire brush (9.3) is fixed on the side plate (9.2) as an isolation structure between the side plate (9.2) and the hollow steel cylinder (6.1). The slope of the outer spiral chute (9) is 25-30 degrees, and the ramp panel (9.1) is provided with transverse grooves to improve the friction of the water flow on the outer spiral chute (9).

5. A construction method based on the concrete conveying device for large vertical drop distances as described in claim 1, characterized in that, Includes the following steps: Step S1: Arrange the concrete pump truck (1), pumping connection pipe (2), vertical transport pipe (3), self-rotating spiral chute structure and concrete pouring operation pipe (5) in an orderly manner, and prepare the pump (10), high-pressure water supply pipe (11) and high-pressure drainage pipe (12) for later use. Step S2: Concrete pouring construction. Based on the concrete's fluidity, select the appropriate pouring method: Normal pouring mode: The concrete pump truck (1) pumps concrete into the inner sleeve (8). The pumped concrete fluid and the inner spiral chute (8.3) are impacted and rubbed against each other, which drives the self-rotating spiral chute structure to rotate and carry out concrete pumping operations. At the same time, the workers operate the concrete pouring operation pipe (5) to carry out concrete pouring construction. Forward push mode - concrete pouring construction: connect the high pressure water supply pipe (11) to the first port (6.4) and the high pressure drainage pipe (12) to the second port (6.5), and then the pump (10) pressurizes the water flow in the forward direction, driving the self-rotating spiral chute structure to rotate in the forward direction, and then the concrete pumping operation is carried out. At the same time, the workers operate the concrete pouring operation pipe (5) to carry out concrete pouring construction. Reverse resistance boosting mode - concrete pouring construction: connect the high pressure water supply pipe (11) to the second port (6.5), connect the high pressure drainage pipe (12) to the first port (6.4), and then the pump (10) pressurizes the water flow in the reverse direction, driving the self-rotating spiral chute structure to rotate in the reverse direction, and then carry out concrete pumping operation. At the same time, the workers operate the concrete pouring operation pipe (5) to carry out concrete pouring construction. As the structural pouring position changes, the vertical transport pipe (3) and the self-rotating spiral chute structure are spliced ​​and lengthened in an orderly manner, and then step S2 is repeated for concrete pouring construction. Step S3: After the concrete pouring is completed, clean the concrete pumping pipe and dismantle it in an orderly manner from bottom to top.

6. The construction method according to claim 5, characterized in that, When the concrete has good fluidity, the reverse resistance mode is used for concrete pouring; when the concrete has moderate fluidity, the normal pouring mode is used for concrete pumping; when the concrete has poor fluidity, the forward push mode is used for concrete pouring.

7. The construction method according to claim 6, characterized in that, When the concrete pumping pipe is partially blocked, the reverse resistance mode - high pressure flushing of the concrete pumping pipe is carried out: the high pressure water supply pipe (11) is connected to the second port (6.5), the high pressure drain pipe (12) is connected to the first port (6.4), and then the pump (10) pressurizes the water flow, driving the self-rotating spiral chute structure to rotate in the opposite direction; then the high pressure water gun is used to fill the inner sleeve (8) with high pressure.

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