Construction method for circular drainage pipeline of tailing pond drainage system
By using a formwork installation method combining steel cage with inflatable airbags in the construction of tailings pond drainage pipelines, the construction difficulty and leakage problems are solved, efficient and economical construction results are achieved, and construction quality and efficiency are improved.
Patent Information
- Application Number
- CN202510715285.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2025-08-05
AI Technical Summary
There are problems such as small working space, high construction difficulty, poor formwork installation, and poor support during the construction of tailings pond drainage pipelines, which lead to common quality problems such as the inner surface not smooth, many joints, and the connection between the prefabricated pipe and the support is prone to leakage, affecting construction efficiency and construction period.
The construction method of concrete pouring is adopted for steel cage installation - external formwork installation, reinforcement - inner formwork installation (using inflatable airbags as core molds) - is used to connect the steel cage to the support table, the outer formwork is reinforced, and the inner formwork is used to inflatable and pressurized to fit the steel cage to ensure the quality of concrete pouring.
It improves the visual perception of concrete pipes, prevents leakage, shortens construction period, reduces labor waste, reduces project costs, and improves construction quality and efficiency.
Smart Images
Figure CN120425804A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of mine engineering pipeline construction, in particular to a method for constructing a circular drainage pipeline in a tailings pond drainage system. Background Art
[0002] Drainage pipe construction is an important part of tailings pond construction. The combination of drainage pipes and drainage wells can effectively reduce rainwater scouring and erosion, and at the same time effectively prevent flood disasters, ensure the safety and stability of the environment around the tailings pond, protect the environmental ecology and promote sustainable development, and provide the necessary safety conditions for the normal operation of the tailings pond.
[0003] The current construction of tailings pond drainage pipes generally uses the construction technology of setting up supports, installing internal and external formwork, and pouring concrete in situ. However, when installing the inner formwork, there are problems such as small working space, high construction difficulty, loose formwork installation joints, and weak formwork support. As a result, after the formwork is removed, the inner surface of the concrete pipe is prone to unevenness and many joints. Problems such as small working space and low construction efficiency are also very obvious. Due to the above problems, some construction sites use prefabricated prefabricated pipes combined with cast-in-situ concrete construction methods to construct tailings pond drainage pipes. However, in this method, the secondary grouting at the connection between the prefabricated pipe and the reserved reinforcement of the foundation is prone to leakage, delaying the construction period.
[0004] In view of the above situation, in order to ensure the smooth construction of the tailings pond drainage pipe, a construction method of the circular drainage pipe of the tailings pond drainage system is proposed. Summary of the Invention
[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a circular drainage pipe construction method for a tailings pond drainage system, which aims to ensure the smooth construction of the tailings pond drainage pipe and effectively prevent the occurrence of leakage and other quality problems.
[0006] The technical solution adopted by the present invention to solve its technical problem is: A method for constructing a circular drainage pipe in a tailings pond drainage system is carried out in the following steps: S1. Installation of steel cage: After the steel cage segments of the drainage pipe are tied, the tied steel cage segments are connected to the cap; S2. Installation and reinforcement of outer formwork: The outer formwork includes the top formwork and vertical side formwork. The top formwork is placed outside the upper arc section of the reinforcement cage, and the vertical side formwork is placed outside the vertical section of the reinforcement cage. S3. Installation and reinforcement of the end formwork: The end formwork consists of an end plate and an end ring plate. A through hole is opened in the center of the end plate. A waterstop is installed in the middle of the end of the reinforcement cage. The end plate is sleeved on the waterstop, and the end ring plate is installed close to the inner side of the waterstop. After the end ring plate is installed, the end plate and the end ring plate are respectively connected to the outer formwork for reinforcement; S4. Installation and reinforcement of the inner formwork: An iron roll is installed inside the steel cage as the inner formwork. An airbag is then inserted into the center of the roll and inflated. The airbag inflates and pressurizes the roll so that it fits the inside of the steel cage. S5. Concrete pouring: First pour the concrete on the side wall and bottom of the drainage pipe and vibrate it; finally pour the concrete on the upper curved section of the pipe and vibrate it; S6. After the concrete curing is completed, the formwork is removed and the construction of the next section of the drainage pipe is carried out.
[0007] Compared with the prior art, the present invention has the following beneficial effects: The construction method of the present invention using an inflatable air bag as a core mold in the inner template can be quickly constructed, effectively improves the appearance of the concrete pipe, prevents leakage problems, and reduces the waste of manpower caused by the difficulty in installing the inner template, shortens the installation and construction period, and thus saves project costs, with good economic and social benefits.
[0008] Preferably, a further technical solution of the present invention is: Preferably, the top formwork is composed of several arc-shaped rolled plates with an arc length of 1m and a length of 2m. The length of the arc-shaped rolled plates is determined according to the length of the steel cage; and the curvature of the arc-shaped rolled plates is determined by the curvature of the upper arc section of the steel cage.
[0009] Preferably, the vertical side formwork is a rectangular plate, and a hole is opened in the center of the top of the formwork, and the size of the opening is 0.1m×0.1m.
[0010] Preferably, along the length direction of the steel cage, template reinforcement ribs are installed at intervals outside the top template. The template reinforcement ribs are arc-shaped structures, and the curvature is determined by the curvature of the upper arc section of the steel cage; adjacent reinforcement ribs are connected by connecting bars.
[0011] Preferably, the end plate includes two rectangular plates, each rectangular plate has a semicircular hole on one side, the two rectangular plates are butted together, the two semicircular holes are spliced into a circular hole, and the diameter of the circular hole is equal to the outer diameter of the water stop.
[0012] Preferably, the outer diameter of the end ring plate is equal to the inner diameter of the water stop, and the inner diameter of the end ring plate is equal to the outer diameter of the airbag after inflation.
[0013] Preferably, the sheet iron is rolled and pressed into a cylindrical shape, and the length of the sheet iron is consistent with the length of the drainage pipe sections.
[0014] Preferably, each segment is provided with a vertical support and a transverse support on the outside of the end template, the transverse support is placed on the outside of the vertical support, and an oblique support 2 is provided between the transverse support and the base.
[0015] Preferably, sealing treatment is performed between the end plate and the outer template, and between the end ring plate and the inner template. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 Schematic diagram of the connection between the reinforcement cage and the cap in the present invention; Figure 2 for Figure 1 yes Figure 1 Side view of; Figure 3 Schematic diagram of the structure for installing and fixing the outer formwork; Figure 4 for Figure 3 Side view of; Figure 5 It is a structural diagram for fixing the end template; Figure 6 for Figure 5 Side view of; Figure 7 This is a structural diagram after the airbag is installed; Figure 8 for Figure 7 Side view of; Figure 9 This is a schematic diagram of the layered casting of the pipe side wall; Figure 10 This is a schematic diagram of the layered pouring of the pipe top; Figure 11 This is a schematic diagram of the pipeline structure after pouring is completed; Figure 12 for Figure 11 Side view of; Figure 13 It is a structural diagram of the top template; Figure 14 It is a structural diagram of the vertical side form; Figure 15 Schematic diagram of the structure of the end plate; Explanation of the accompanying reference numerals: 1. Steel cage; 2. Cap; 3. Top formwork; 301. Arc-shaped rolled plate; 4. Vertical side formwork; 5. Keel support; 6. Diagonal support one; 7. Formwork reinforcement rib; 8. Square hole; 9. End plate; 10. End ring plate; 11. Waterstop; 12. Diagonal support two; 13. Horizontal support; 14. Vertical support; 15. Airbag; 16. Inner formwork; 17. Vibrating rod. DETAILED DESCRIPTION
[0017] The present invention will be further described below in conjunction with specific embodiments. The purpose is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.
[0018] The foundation of the tailings drainage pipe is generally a strip cap + pile foundation. Its main purpose is to prevent the pipe from sinking due to poor backfill quality and oblique impact force during the drainage process. During the construction of the drainage pipe, the drainage pipe is divided into several sections, and then the formwork is cast section by section. The steel cage of each section is a double-layer structure. The inner layer of the steel cage is a cylindrical structure, and the outer layer is divided into an upper arc section of the steel cage and a vertical section of the steel cage. The arc of the upper arc section of the steel cage is consistent with that of the inner cylindrical structure. Figures 1 to 15 As shown, the construction is carried out according to the process of steel cage installation - outer formwork installation, reinforcement - inner formwork installation, reinforcement - concrete pouring - formwork removal. The specific contents are as follows: S1. Installation of steel cage 1: After the steel cage 1 of the drainage pipe is tied in sections, tie the tied steel cage 1 to the steel bar heads reserved on the pedestal 2, and set mortar pads between the steel cage 1 and the pedestal 2.
[0019] S2. Installation and reinforcement of the outer formwork: The outer formwork consists of a top formwork 3 and a vertical side formwork 4. The top formwork 3 is placed on the outside of the upper arc section of the steel cage 1, and the vertical side formwork 4 is placed on the outside of the vertical section of the steel cage 1; the vertical side formwork 4 is made of bamboo plywood, 12 mm thick, 1.2 m long, and 0.9 m wide. A square hole 8 is opened in the upper part of the vertical side formwork 4, with a hole size of 0.1 m * 0.1 m; horizontal and vertical keel supports 5 are set on the outside of the vertical side formwork 4, and an oblique support 6 is set between the pile foundation, and the keel supports 5 on both sides of the steel cage 1 are fixed with tension bolts; The top formwork 3 consists of two curved plates with an arc length of 1m and a length of 2m. The length of each curved plate is determined by the length of the reinforcement cage 1. The two curved plates are symmetrically arranged about the center of the upper curved section of the reinforcement cage 1, and the lower end of each curved plate is placed on the inner side of the vertical side plate on its side. The curvature of the arc-shaped roll is determined by the curvature of the upper arc section of the steel cage 1; the outside of the arc-shaped roll is welded with template reinforcement ribs 7 at intervals along the length direction of the steel cage 1, and the two ends of the template reinforcement ribs 7 are respectively connected to the outer walls of the two arc-shaped rolls; the template reinforcement ribs 7 are an arc-shaped structure, and their curvature is determined by the curvature of the upper arc section of the steel cage 1. Adjacent template reinforcement ribs 7 are connected into a whole by connecting ribs arranged at intervals along the surface of the arc-shaped roll.
[0020] The square hole 8 at the top of the vertical side form 4 and the gap between the two arc-shaped rolled plates are used as vibration holes respectively.
[0021] S3. Installation and reinforcement of the end template: The end template consists of an end plate 9 and an end ring plate 10. Both the end plate 9 and the end ring plate 10 are made of bamboo plywood. The end plate 9 is 12 mm thick, 1.2 m long, and 0.9 m wide. The end plate 9 consists of two rectangular plates. A semicircular hole is opened on one side of each end. The diameters of the two semicircular holes are equal, and the two semicircular holes are spliced to form a circular hole. The diameter of the circular hole is equal to the outer diameter of the waterstop 11. The thickness of the end ring plate 10 is 12 mm. The outer diameter of the end ring plate 10 is equal to the inner diameter of the water stop 11. The inner diameter of the end ring plate 10 is equal to the inner diameter of the water stop 11. The inner diameter of the end ring plate 10 is equal to the outer diameter of the air bag 15 after inflation. The water stop 11 is placed in the middle of the steel cage 1, and then clamped inside and outside by the end ring plate 10 and the end plate 9. After the end ring plate 10 and the end plate 9 are assembled with the water stop 11, they are assembled and reinforced with the vertical side form 4; Each segment is provided with a vertical support 14 and a transverse support 13 on the outside of the end formwork. The transverse support 13 is placed outside the vertical support 14, and a second diagonal support 12 is provided between the transverse support 13 and the base 2. The vertical support 14, the transverse support 13 and the second diagonal support 12 are used to reinforce the end formwork. The joints between the end formwork and the vertical formwork are sealed with rubber strips, and the position of the waterstop 11 is determined according to the design requirements.
[0022] S4. Installation and reinforcement of the inner formwork 16: In the factory, an iron coil is processed according to the inner diameter of the steel cage 1. The iron coil is made by pressing the iron coil into a cylindrical shape. The tail of the iron coil is a galvanized steel plate with a thickness of 3mm. The length of the iron coil is equal to the length of the drainage pipe segment. The iron coil is installed inside the steel cage 1, and then a high-pressure airbag 15 is inserted into the iron coil. A small compressor is used to pressurize the iron coil. The pressure value is set according to the upper part of the airbag 15 and the lateral concrete pressure, and a safety factor of 1.3 is taken into account. Generally, the pressure for small diameter pipes reaches 0.1MPa and is maintained at a stable pressure for 20 minutes without pressure drop during this period. When the small compressor inflates the airbag 15, the airbag 15 inflates and pressurizes the iron coil, so that the iron coil reinforces the inner formwork 16 of the steel cage 1.
[0023] S5. Concrete pouring: first pour the concrete for the side wall and bottom of the drainage pipe in layers and vibrate it. The depth of each layer should not exceed 30cm. When pouring to the vibration hole position of the vertical side form 4, immediately reinforce and seal the vibration hole. Then start pouring the concrete for the upper arc section of the pipe and vibrate it. While pouring, observe the pressure value of the air bag 15 at any time. After pouring, perform surface finishing and calendering.
[0024] S6. During concrete curing, geomembrane is laid in time and a dedicated person is assigned to record watering. When the concrete strength reaches 75% during curing, the airbag 15 is depressurized and the iron roll is pulled out. The vertical formwork, formwork reinforcement ribs 7 and top formwork 3 are removed and the next section of the drainage pipe is constructed.
[0025] The present invention adopts an inflatable core mold construction method on the inner template of the drainage pipe, which can quickly fix the inner template, reduce the installation difficulty of the inner template, shorten the installation and construction period, and reduce the waste of human resources; during the concrete pouring process, the poured inner surface is always guaranteed to be complete and smooth, thereby improving the construction quality; and when the segment is long and the aperture is small, which cannot meet the needs of construction personnel for internal installation, the inner template can use a high-pressure air bag as an inflatable core mold, which effectively solves the problem of narrow working surface. Iron sheets are arranged around the air bag to ensure that the inner surface of the pipe is relatively complete and smooth during the concrete pouring process.
[0026] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes made by using the contents of the present invention description and the drawings are included in the scope of the present invention.
Claims
1. A method for constructing a circular drainage pipe in a tailings pond drainage system, characterized in that: Follow these steps: S1. Installation of steel cage: After the steel cage segments of the drainage pipe are tied, the tied steel cage segments are connected to the cap; S2. Installation and reinforcement of outer formwork: The outer formwork includes the top formwork and vertical side formwork. The top formwork is placed outside the upper arc section of the reinforcement cage, and the vertical side formwork is placed outside the vertical section of the reinforcement cage. S3. Installation and reinforcement of the end formwork: The end formwork consists of an end plate and an end ring plate. A through hole is opened in the center of the end plate. A waterstop is installed in the middle of the end of the reinforcement cage. The end plate is sleeved on the waterstop, and the end ring plate is installed close to the inner side of the waterstop. After the end ring plate is installed, the end plate and the end ring plate are respectively connected to the outer formwork for reinforcement; S4. Installation and reinforcement of the inner formwork: An iron roll is installed inside the steel cage as the inner formwork. An airbag is then inserted into the center of the roll and inflated. The airbag inflates and pressurizes the roll so that it fits the inside of the steel cage. S5. Concrete pouring: First pour the concrete on the side wall and bottom of the drainage pipe and vibrate it; finally pour the concrete on the upper curved section of the pipe and vibrate it; S6. After the concrete curing is completed, the formwork is removed and the next section of the drainage pipe is constructed.
2. The method for constructing a circular drainage pipe in a tailings pond drainage system according to claim 1, characterized in that: The top formwork consists of several arc-shaped rolled plates with an arc length of 1m and a length of 2m. The length of the arc-shaped rolled plates is determined according to the length of the steel cage; and the curvature of the arc-shaped rolled plates is determined by the curvature of the upper arc section of the steel cage.
3. The method for constructing a circular drainage pipe in a tailings pond drainage system according to claim 1, characterized in that: The vertical side formwork is a rectangular plate with a hole centered on the top of the formwork, and the size of the hole is 0.1m×0.1m.
4. The method for constructing a circular drainage pipe in a tailings pond drainage system according to claim 1, characterized in that: Along the length direction of the steel cage, formwork reinforcement ribs are installed at intervals on the outside of the top formwork. The formwork reinforcement ribs are arc-shaped structures, and the curvature is determined by the curvature of the upper arc section of the steel cage; adjacent reinforcement ribs are connected by connecting bars.
5. The method for constructing a circular drainage pipe in a tailings pond drainage system according to claim 1, characterized in that: The end plate includes two rectangular plates, each of which has a semicircular hole on one side. The two rectangular plates are butted together, and the two semicircular holes are spliced into a circular hole, and the diameter of the circular hole is equal to the outer diameter of the water stop.
6. The method for constructing a circular drainage pipe in a tailings pond drainage system according to claim 1, characterized in that: The outer diameter of the end ring plate is equal to the inner diameter of the water stop, and the inner diameter of the end ring plate is equal to the outer diameter of the airbag after inflation.
7. The method for constructing a circular drainage pipe in a tailings pond drainage system according to claim 1, characterized in that: The iron sheet is rolled and pressed into a cylindrical shape, and the length of the iron sheet is consistent with the length of the drainage pipe section.
8. The method for constructing a circular drainage pipe in a tailings pond drainage system according to claim 1, characterized in that: Each segment is provided with a vertical support and a horizontal support on the outside of the end formwork. The horizontal support is placed on the outside of the vertical support, and an inclined support 2 is provided between the horizontal support and the base.
9. The method for constructing a circular drainage pipe in a tailings pond drainage system according to claim 1, characterized in that: The end plate and the outer template, as well as the end ring plate and the inner template are sealed respectively.