Vacuum auxiliary filling equipment and method for concrete in spiral cavity in pipe wall interlayer
By using vacuum-assisted filling equipment and methods, the construction difficulties of concrete in spiral cavities have been solved, achieving dense filling and strength enhancement, detecting leaks, and making it suitable for concrete filling of longer pipes.
Patent Information
- Application Number
- CN202410644900.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-11-25
AI Technical Summary
Existing technologies are unable to effectively solve the problem of filling concrete into spiral cavities, especially when the pipe is high, construction is difficult, air is difficult to expel, concrete is prone to separation from the cavity wall, liquid column difference makes it difficult to complete the grouting, and micro air bubbles and bleeding cause non-density problems.
Vacuum-assisted filling equipment and methods are used. The pipe is placed horizontally, and the spiral cavity outlets at both ends are sealed. A vacuum pump creates negative pressure inside the pipe to assist the concrete slurry to move in a spiral shape. Combined with valve control steps, the filling is ensured to be dense.
It ensures that the concrete and the cavity wall are not easily separated, the filling is dense, it is suitable for longer pipes, it enhances the strength of the concrete inside the cavity, and it can detect leaks in the pipe. The concrete and the pipe wall generate prestress.
Smart Images
Figure CN121004672A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of concrete pipe filling technology, and in particular to a vacuum-assisted filling device and method for concrete in a cavity with a pipe wall having a sandwich structure in the form of a spiral. Background Technology
[0002] The applicant has filed a prior patent application entitled "A Double-Wall Spiral Welded Pipe and Its Manufacturing Method", with application number 2021218306623. The pipe wall is composed of two outer steel strips and a vertical reinforcing ring in the steel strip interlayer. The pipe wall has a spiral cavity that is connected end to end. Fine stone self-leveling concrete or concrete mortar needs to be poured into the spiral cavity.
[0003] One common method is to erect the steel pipe and inject concrete under high pressure from the bottom using a jacking method. The air in the cavity is discharged from the vent at the top as the liquid level rises. However, when the pipe is high, it is difficult to erect the pipe and construction safety is hard to guarantee. At the same time, when the pipe is high, the injection pressure of the concrete is very high, which will cause the cavity wall to deform. In addition, a small amount of air and water in the cavity cannot be discharged, causing a gap between the concrete and the cavity wall. Furthermore, the excess water that seeps out after the concrete hydration reaction is over will also cause a gap between the concrete and the cavity wall, ultimately affecting the performance of the entire product and structure. The second commonly used method involves placing the steel pipe horizontally, injecting concrete from one end and expelling it from the other. However, experiments revealed the following problems: First, a large amount of air remains at the top of each spiral cavity and cannot escape. Second, during the pouring process, a difference in liquid column height is formed between the left and right sides of multiple spiral cavities. The cumulative effect of this difference in liquid column height creates significant reaction pressure at the injection end, making pouring difficult. Furthermore, this method cannot solve the problems of voids and incomplete compaction caused by microbubbles and bleeding in the concrete, such as the separation of concrete from the cavity walls. Figure 1 and 2 As shown. Summary of the Invention
[0004] Purpose of the invention: In order to overcome the shortcomings of the prior art, the first objective of this invention is to disclose a vacuum-assisted filling device for concrete in a spiral cavity; The second objective is to disclose a method for vacuum-assisted filling of concrete into a spiral cavity using the aforementioned equipment.
[0005] Technical solution: The spiral cavity concrete vacuum-assisted filling device disclosed in this invention has a horizontally placed tube body with the spiral cavity outlets at both ends sealed and the grouting port located at the bottom of one end. The filling equipment includes: The first pipe has a first valve and a second valve respectively provided in the extension direction of the pipe body of each spiral cavity corresponding to the top of the pipe body and communicating with the interior. The second pipeline has one end connected between the first valve and the second valve of the first pipeline, and a third valve is provided on the second pipeline. A vacuum tank, with the other end of the second pipe connected to the vacuum tank, which is connected to a vacuum pump.
[0006] Furthermore, the top outer wall of the spiral cavity has an opening, through which the first pipe communicates with the interior of the spiral cavity.
[0007] Furthermore, the vacuum tank is equipped with a transparent observation window.
[0008] Furthermore, the vacuum pump is connected to the top of the vacuum tank, and the second pipe is connected to the bottom or side of the vacuum tank.
[0009] Furthermore, the concrete filling the spiral cavity is micro-expansion concrete.
[0010] The grouting method based on the above-mentioned spiral cavity concrete vacuum-assisted filling equipment includes the following steps: S1. Close all second valves and the first and third valves corresponding to all spiral cavities except the last one. Start injecting concrete from the grouting port. At the same time, start the vacuum pump. The first and second pipes at the very end start to draw a vacuum, so that negative pressure is formed in all spiral cavities to assist the concrete grout to move in a spiral shape. S2. When slurry appears inside the vacuum tank, close the last first valve and the vacuum pump, open the first and second valves at the top of all spiral cavities, and continue grouting. When slurry is discharged from the end of the second valve of the first spiral cavity near the grouting port, close the first valve at the top of that first spiral cavity. Then, continue grouting until slurry is discharged from the end of the second valve at the top of the next spiral cavity, then close the first valve at the top of that spiral cavity. Repeat this operation until the last spiral cavity. S3. Open the first and third valves, close the second valve and the grouting port valve, start the vacuum pump to evacuate, keep the spiral cavity under negative pressure, and maintain this state for a certain period of time. S4. Close all first valves, turn off the vacuum pump, open the grouting port valve, perform a second grouting, maintain pressure for a certain period of time, close the grouting port valve, and remove all grouting and auxiliary equipment after the concrete in the spiral cavity has initially set.
[0011] Beneficial effects: Compared with the prior art, the advantages of the present invention are: 1. Voids are less likely to form between the pipe wall and the concrete inside the cavity, ensuring a dense filling; 2. This equipment can fill relatively long pipes; 3. It can increase the strength of the concrete inside the cavity; 4. During the injection process, the pipe body can be checked for leaks; 5. Prestress can be generated between the concrete and the pipe wall inside the spiral cavity. Attached Figure Description
[0012] Figure 1 This is a radial sectional view of concrete pouring when the steel pipe is placed horizontally in the background art. Figure 2 This is an axial sectional view of concrete pouring when the steel pipe is placed horizontally in the background art. Figure 3 This is a schematic diagram of the structure of the present invention. Detailed Implementation
[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0014] like Figure 3 The spiral cavity concrete vacuum-assisted filling device shown has a horizontally placed tube with its two ends of the spiral cavity outlet sealed. The grouting port is located at the bottom of one end, through which micro-expansion concrete is filled into the spiral cavity.
[0015] The filling equipment includes: The first pipe 1 is provided for each spiral cavity at the top of the pipe body. The top outer wall of the spiral cavity is opened. The first pipe 1 is connected to the inside of the spiral cavity through the opening. The first valve 2 and the second valve 3 are respectively provided in the extension direction of the pipe body of the first pipe 1. The second pipe 4 is connected at one end to the first valve 2 and the second valve 3 of the first pipe 1, and the second pipe 4 is provided with a third valve 5. The vacuum tank 6 is connected to the other end of the second pipe 4. The vacuum tank 6 is connected to a vacuum pump 7 and has a transparent observation window 8.
[0016] The vacuum pump 7 is connected to the top of the vacuum tank 6, and the second pipe 4 is connected to the bottom or side of the vacuum tank 6.
[0017] The grouting method using the aforementioned spiral cavity vacuum-assisted filling equipment for concrete includes the following steps: S1. Close all second valves 3, close the first valves 2 and third valves 5 corresponding to all spiral cavities except the last one, and start injecting concrete from the grouting port. At the same time, the last second pipe 4 starts to draw a vacuum, so that negative pressure is formed in all spiral cavities to assist the concrete grout to move in a spiral shape. S2. When slurry appears in the vacuum tank 6, close the last third valve 5 and the vacuum pump 7, open the first valve 2 and the second valve 3 at the top of all spiral cavities, and continue grouting. When slurry is discharged from the end of the second valve 3 of the first spiral cavity near the grouting port, close the first valve 2 at the top of the first spiral cavity and continue grouting. When slurry is discharged from the end of the second valve 3 at the top of the next spiral cavity, close the first valve 2 at the top of the spiral cavity for that cycle. Repeat this operation until the last spiral cavity. S3. Open the first valve 2 and the third valve 5, close the second valve 3 and the grouting port valve, start the vacuum pump 7, and maintain the vacuum state for a certain period of time. S4. Close all first valves 2, open the grouting port valve, perform a second grouting, maintain pressure for a certain period of time, close the grouting port valve, and remove all grouting and auxiliary equipment after the concrete in the spiral cavity has initially set.
Claims
1. A vacuum-assisted filling device for a spiral cavity of concrete within a pipe wall interlayer, characterized in that, The pipe is placed horizontally, with the spiral cavity outlets at both ends sealed, and the grouting port located at the bottom of one end; The filling equipment includes: The first pipe (1) is provided with each spiral cavity at the top of the pipe body and communicates with the inside. The first pipe (1) is provided with a first valve (2) and a second valve (3) in the extension direction of the pipe body. The second pipe (4) is connected at one end to the first valve (2) and the second valve (3) of the first pipe (1), and a third valve (5) is provided on the second pipe (4). The vacuum tank (6) is connected to the other end of the second pipe (4), and the vacuum tank (6) is connected to a vacuum pump (7).
2. The vacuum-assisted filling device for a spiral cavity concrete structure with a pipe wall interlayer according to claim 1, characterized in that: The top outer wall of the spiral cavity has an opening, and the first pipe (1) is connected to the inside of the spiral cavity through the opening.
3. The vacuum-assisted filling device for the spiral cavity concrete in the pipe wall interlayer according to claim 1, characterized in that: The vacuum tank (6) is provided with a transparent observation window (8).
4. The vacuum-assisted filling device for the spiral cavity of concrete in the pipe wall interlayer according to claim 1, characterized in that: The vacuum pump (7) is connected to the top of the vacuum tank (6), and the second pipe (4) is connected to the bottom or side of the vacuum tank (6).
5. The vacuum-assisted filling device for the spiral cavity concrete in the pipe wall interlayer according to claim 1, characterized in that: The concrete filling the spiral cavity is micro-expansion concrete.
6. A grouting method for a vacuum-assisted filling device for concrete in a spiral cavity within a pipe wall interlayer as described in claim 1, characterized in that, Includes the following steps: S1. Close all second valves (3) and the first valves (2) and third valves (5) corresponding to all spiral cavities except the last one. Start injecting concrete from the grouting port. At the same time, start the vacuum pump (7). The last second pipe (4) and the first pipe (1) start to draw a vacuum, so that negative pressure is formed in all spiral cavities to assist the concrete slurry to move in a spiral shape. S2. When slurry appears in the vacuum tank (6), close the last first valve (2) and vacuum pump (7), open the first valve (2) and second valve (3) at the top of all spiral cavities, and continue grouting. After the slurry is discharged from the end of the second valve (3) of the first spiral cavity near the grouting port, close the first valve (2) at the top of the first spiral cavity. Then, continue grouting. After the slurry is discharged from the end of the second valve (3) at the top of the next spiral cavity, close the first valve (2) at the top of the spiral cavity. Repeat this operation until the last spiral cavity. S3. Open all first valves (2) and third valves (5), close the second valve (3) and grouting port valve, start the vacuum pump (7) to draw a vacuum, and maintain the vacuum state for a certain period of time; S4. Close all first valves (2), open the grouting port valve, perform a second grouting, maintain pressure for a certain period of time, close the grouting port valve, and remove all grouting and auxiliary equipment after the concrete in the spiral cavity has initially set.