Construction method of a cylindrical diving pool

Abstract

The present invention provides a construction method for a cylindrical diving pool. A hoist is provided on the first-floor ring beam for the overall sliding descent construction of the underground steel platform. By using the formwork system of the underground steel platform, the pouring of the cylindrical diving pool from top to bottom can be realized. By setting steel platform supports on the cylindrical diaphragm wall and setting the oil cylinder assemblies on the outer peripheral surface of the regular polygon steel box girder, the force state conversion of the self-weight of the underground steel platform from being borne by the wire ropes to being borne by the steel platform supports can be realized, improving the overall construction safety. By integrating the pre-pressurized oil cylinder assemblies, working platforms, formwork systems, and equipment platforms on the underground steel platform, the frequency of installation and disassembly of equipment and facilities can be reduced, and the construction efficiency, mechanization and automation levels, and reuse rate can be effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering machinery, and relates to a construction method for a cylindrical diving pool. Background Art

[0002] An underground cylindrical diving pool is a vertical cylindrical structure. The construction process includes pouring a cylindrical diaphragm wall, dewatering, excavating soil, temporarily supporting the cylindrical side wall, and pouring the cylindrical reinforced concrete side wall of the diving pool. Among them, excavating soil, temporarily supporting the cylindrical side wall, and pouring the cylindrical reinforced concrete side wall of the diving pool are the main processes for forming the cylindrical structure of the underground circular diving pool. To cooperate with the construction of the cylindrical structure forming, scattered equipment and facilities such as temporary steel supports, hydraulic cylinders, steel formworks, scaffolding, and earthmoving machinery are commonly used. The application of these scattered equipment and facilities has the disadvantages of frequent installation and disassembly, large transfer workload, low construction efficiency, low mechanization and automation levels, and being not conducive to turnover use.

[0003] Therefore, how to provide a construction method for a cylindrical diving pool with low installation and disassembly frequency of equipment and facilities, high construction efficiency, high mechanization and automation levels, and high reuse rate has become a technical problem that needs to be further improved and optimized in the construction industry. Summary of the Invention

[0004] The present invention aims to invent a construction method for a cylindrical diving pool. By adopting the method of overall automatic sliding down of an underground steel platform, the pouring of the cylindrical diving pool from top to bottom can be realized. By integrating the pre-pressurized oil cylinder assembly, working platform, formwork system, and equipment platform on the underground steel platform, the problems of high installation and disassembly frequency of existing equipment and facilities, low construction efficiency, low mechanization and automation levels, and low reuse rate are solved.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] A construction method for a cylindrical diving pool includes the following steps:

[0007] Step 1: Assemble the underground steel platform on the ground. The underground steel platform includes a regular polygon steel box girder, several oil cylinder assemblies, several lifting points, a formwork system, an operation platform, a platform guardrail, and an equipment platform. The regular polygon steel box girder is composed of several straight-section steel box girders spliced together. The lifting points are fixedly connected to the inner side of the regular polygon steel box girder at equal intervals. The oil cylinder assemblies are arranged at equal intervals and vertically on the outer peripheral surface of the regular polygon steel box girder. The operation platform is arranged on the inner side of the regular polygon steel box girder and forms a circle. The platform guardrail is arranged on the side of the operation platform away from the regular polygon steel box girder and forms a circle. The equipment platform is arranged on the side of the operation platform away from the regular polygon steel box girder. The formwork system is arranged on the regular polygon steel box girder. The oil cylinder assembly includes an oil cylinder support and a hydraulic cylinder, and the two are hinged. The oil cylinder support is hinged to the straight-section steel box girder and is located outside the regular polygon steel box girder. The hydraulic cylinder is controlled by a hydraulic power system;

[0008] Step 2: After the construction of the cylindrical diaphragm wall is completed and meets the excavation conditions, excavate the soil inside the cylindrical diaphragm wall to a certain depth;

[0009] Step 3: Install several steel platform supports on the inner wall of the cylindrical diaphragm wall, hoist the underground steel platform and make the regular polygon steel box girder support on the steel platform supports;

[0010] Step 4: Hoist the steel reinforcement cage, pour concrete using the formwork system, and complete the construction of the first-floor ring beam;

[0011] Step 5: After the first-floor ring beam meets the strength requirements, install several winch supports and winches on the upper part of the first-floor ring beam, and connect the steel wire ropes on the winches to the lifting points of the underground steel platform;

[0012] Step 6: Continue to excavate the soil to a certain depth, move the steel platform supports downward and install them on the inner wall of the cylindrical diaphragm wall corresponding to the next construction section, operate the winch, lower the underground steel platform, and make the regular polygon steel box girder support on the steel platform supports;

[0013] Step 7: Operate the hydraulic power system to extend the hydraulic cylinders to support on the inner wall of the cylindrical diaphragm wall with a certain pre-pressure to play a role in temporary support;

[0014] Step 8: Hoist the steel reinforcement cage into place and position the formwork system;

[0015] Step 9: Operate the hydraulic power system to contract the hydraulic cylinders, cancel the pre-pressure applied on the inner wall of the cylindrical diaphragm wall, and make the self-weight of the underground steel platform be entirely borne by the steel platform supports;

[0016] Step 10: Pour concrete to complete the construction of the reinforced concrete cylindrical wall of the diving pool;

[0017] Step 11: Repeat Steps 6 to 10 until the designed depth of the cylindrical diving pool is reached. Dismantle the underground steel platform and lift the cylinder to the ground, and complete the pouring of the bottom slab of the cylindrical diving pool, thereby realizing the construction of the cylindrical diving pool.

[0018] Preferably, in the above construction method of the cylindrical diving pool, the formwork system includes a bottom formwork system and a side formwork system. The bottom formwork system is arranged on the upper side of the regular polygon steel box girder, and the side formwork system is arranged on the upper side of the bottom formwork system. The side formwork system includes a number of formwork units and a number of formwork removal devices. Each formwork unit is installed on the upper side of the bottom formwork system through the corresponding formwork removal device. After all the formwork units are closed by the formwork removal devices, they can enclose a cylindrical structure.

[0019] Preferably, in the above construction method of the cylindrical diving pool, the bottom formwork system includes bottom formwork cross beams, bottom formwork longitudinal beams and a bottom formwork panel. The bottom formwork cross beams are rigidly connected to the regular polygon steel box girder and are located on the upper side of the regular polygon steel box girder; the bottom formwork longitudinal beams are vertically connected to the bottom formwork cross beams, and the bottom formwork longitudinal beams are located on the upper side of the bottom formwork cross beams; the bottom formwork panel is placed on the upper side of the bottom formwork longitudinal beams, and a temporary connection is adopted between the bottom formwork panel and the bottom formwork longitudinal beams.

[0020] Preferably, in the above construction method of the cylindrical diving pool, in Step 4, hoist the steel reinforcement cage onto the bottom formwork system, and on the premise of ensuring that the bottom formwork system and the side formwork system are installed and supported in place, complete the pouring construction of the first-floor ring beam;

[0021] In Step 5, after the first-floor ring beam meets the strength requirements, operate the formwork removal device to realize the interval formwork removal of the formwork units;

[0022] In Step 8, first install the bottom formwork system to make the bottom formwork panel in place, then hoist the steel reinforcement cage in place, operate the formwork removal device to realize the closing of the formwork units, and lock and reinforce the formwork units to realize the in-place of the formwork system;

[0023] In Step 10, after the reinforced concrete cylindrical wall of the diving pool meets the strength requirements, operate the formwork removal device to realize the interval formwork removal of the formwork units.

[0024] Preferably, in the above construction method of the cylindrical diving pool, the operation platform is arranged above the bottom formwork longitudinal beams and is located inside the bottom formwork longitudinal beams.

[0025] Preferably, in the above construction method of the cylindrical diving pool, the platform guardrail includes a guardrail sleeve and a guardrail unit. The guardrail sleeve is vertically fixed at the end of the bottom formwork cross beam, and the vertical rods on both sides of the guardrail unit are connected to the guardrail sleeve by hoop.

[0026] Preferably, in the construction method of the above-mentioned cylindrical diving pool, the equipment platform includes platform crossbeams and an equipment platform deck for installing mechanical equipment. The platform crossbeams are fixed on the upper side of the straight-section steel box girder and horizontally extend inwards for a certain distance, and the equipment platform deck is fixed on the upper side of the platform crossbeams.

[0027] Preferably, in the construction method of the above-mentioned cylindrical diving pool, a hydraulic power system, an excavator robotic arm, a soil collection box, and a tower ladder converted from a construction elevator are arranged on the equipment platform.

[0028] It can be seen from the above disclosed technical solutions that, compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] In the construction method of the cylindrical diving pool provided by the present invention, a hoist is arranged on the first-floor ring beam for the overall sliding descent construction of the underground steel platform. By using the formwork system of the underground steel platform, the cylindrical diving pool can be poured from top to bottom; by arranging steel platform supports on the cylindrical diaphragm wall and arranging the oil cylinder assemblies on the outer peripheral surface of the regular polygon steel box girder, the force state conversion of the self-weight of the underground steel platform from being borne by the steel wire ropes to being borne by the steel platform supports can be realized, improving the safety of the overall construction. By integrating the pre-pressurized oil cylinder assemblies, the working platform, the formwork system, and the equipment platform on the underground steel platform, the frequency of installation and disassembly of equipment and facilities can be reduced, and the construction efficiency, mechanization and automation level, and reuse rate can be effectively improved. Description of the Drawings

[0030] The drawing is a sectional view of the construction state of an overall sliding descent type steel platform system for a circular deep foundation pit.

[0031] The drawing is a three-dimensional view of the sliding descent state of an overall sliding descent type steel platform system for a circular deep foundation pit.

[0032] The drawing is a front view of an overall sliding descent type steel platform system for a circular deep foundation pit.

[0033] The drawing is a top view of an overall sliding descent type steel platform system for a circular deep foundation pit.

[0034] The drawing is a three-dimensional view of an overall sliding descent type steel platform system for a circular deep foundation pit.

[0035] The drawing is a three-dimensional view of an overall sliding descent type steel platform system for a circular deep foundation pit.

[0036] The drawing is a three-dimensional view of the steel box girder of an overall sliding descent type steel platform system for a circular deep foundation pit.

[0037] The drawing is a three-dimensional view of the oil cylinder assembly of an overall sliding descent type steel platform system for a circular deep foundation pit.

[0038] The attached drawing is the front view (without the side formwork system) of an integral sliding steel platform system for a circular deep foundation pit.

[0039] The attached drawing is the top view (without the side formwork system) of an integral sliding steel platform system for a circular deep foundation pit.

[0040] The attached drawing is the top view of the side formwork system of an integral sliding steel platform system for a circular deep foundation pit.

[0041] The attached drawing is the three-dimensional view of the side formwork system of an integral sliding steel platform system for a circular deep foundation pit.

[0042] The attached drawing is the three-dimensional view (without showing the side formwork system) of an integral sliding steel platform system for the construction of the cylindrical structure of an underground cylindrical diving pool.

[0043] The attached Figures 14 to 23 is the construction flow chart of an integral sliding steel platform system for a circular deep foundation pit.

[0044] In the figure: 1. Cylindrical diaphragm wall; 2. First-floor ring beam; 3. Hoist support; 4. Hoist; 5. Steel wire rope; 6. Underground steel platform; 61. Regular polygon steel box girder; 611. Straight-section steel box girder; 62. Oil cylinder assembly; 621. Oil cylinder support; 622. Hydraulic oil cylinder; 63. Hoisting point; 64. Bottom formwork system; 641. Bottom formwork cross beam; 642. Bottom formwork longitudinal beam; 643. Bottom formwork panel; 65. Side formwork system; 651. Formwork unit; 652. Formwork withdrawal device; 66. Working platform; 67. Platform guardrail; 671. Guardrail sleeve; 672. Guardrail unit; 68. Equipment platform; 681. Platform cross beam; 682. Equipment platform plate; 7. Reinforced concrete cylindrical wall of the diving pool; 8. Steel platform support; 9. Steel reinforcement cage. Specific embodiments

[0045] The present invention will be further described in detail below in conjunction with the attached drawings and specific embodiments. The technical content and features of the present invention will be described in detail below with reference to the listed embodiments in conjunction with the attached drawings. It should be noted that the attached drawings are in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention. For the convenience of description, the "upper" and "lower" directions mentioned below are consistent with the upper and lower directions of the attached drawings, but this should not be a limitation to the technical solution of the present invention.

[0046] Please refer to Figures 1 to 13, this embodiment discloses an integral sliding steel platform system for a circular deep foundation pit, including: a winch 4, a steel wire rope 5, an underground steel platform 6, and a steel platform support 8. The underground steel platform 6 includes a regular polygon steel box girder 61, a number of oil cylinder assemblies 62, a number of lifting points 63, a formwork system, an operation platform 66, a platform guardrail 67, and an equipment platform 68. The steel platform supports 8 are detachably and equidistantly installed on the inner wall of the cylindrical diaphragm wall 1. The regular polygon steel box girder 61 is formed by splicing a number of straight-section steel box girders 611. The lifting points 63 are fixedly connected equidistantly to the inner side of the regular polygon steel box girder 61. The oil cylinder assemblies 62 are vertically arranged equidistantly on the outer peripheral surface of the regular polygon steel box girder 61. The operation platform 66 is arranged inside the regular polygon steel box girder 61 and forms a circle. The platform guardrail 67 is arranged on the side of the operation platform 66 away from the regular polygon steel box girder 61 and forms a circle. The equipment platform 68 is arranged on the side of the operation platform 66 away from the regular polygon steel box girder 61. The formwork system is arranged on the upper side of the regular polygon steel box girder 61. The winch 4 is arranged at the upper part of the circular deep foundation pit. The winch 4 is connected to the lifting points 63 of the underground steel platform 6 through the steel wire rope 5 to realize the overall sliding control of the underground steel platform 6 by the winch 4. The regular polygon steel box girder 61 can be supported by the steel platform supports 8 or supported on the inner wall of the cylindrical diaphragm wall 1 by a number of oil cylinder assemblies 62.

[0047] The integral sliding steel platform system for a circular deep foundation pit provided by the present invention sets a winch 4 at the upper part of the circular deep foundation pit for the overall sliding construction of the underground steel platform 6. By using the formwork system of the underground steel platform 6, the pouring of the cylindrical diving pool from top to bottom can be realized. By setting steel platform supports 8 on the cylindrical diaphragm wall 1, the force state conversion of the self-weight of the underground steel platform 6 from being borne by the steel wire rope 5 to being borne by the steel platform supports 8 can be realized, improving the safety of the overall construction. By integrating the pre-pressurized oil cylinder assemblies 62, the operation platform 66, the formwork system, and the equipment platform 68 on the underground steel platform 6, the installation and disassembly frequency of equipment and facilities can be reduced, and the construction efficiency, mechanization and automation level, and reuse rate can be effectively improved.

[0048] Preferably, in the above-mentioned integral sliding steel platform system for circular deep foundation pits, the formwork system includes a bottom formwork system 64 and a side formwork system 65. The bottom formwork system 64 is arranged on the upper side of the regular polygon steel box girder 61, and the side formwork system 65 is arranged on the upper side of the bottom formwork system 64. The side formwork system 65 includes a number of formwork units 651 and a number of formwork removal devices 652. Each formwork unit 651 is installed on the upper side of the bottom formwork system 64 through the corresponding formwork removal device 652. After all the formwork units 651 are closed by the formwork removal devices 652, they can form a cylindrical structure for the casting construction of a cylindrical diving pool. The side formwork system 65 adopts the formwork removal device 652, which can improve the automation and mechanization level of formwork removal and reduce manual labor.

[0049] Preferably, in the above-mentioned integral sliding steel platform system for circular deep foundation pits, the bottom formwork system 64 includes bottom formwork cross beams 641, bottom formwork longitudinal beams 642 and a bottom formwork panel 643. The bottom formwork cross beams 641 are rigidly connected to the regular polygon steel box girder 61 and are located on the upper side of the regular polygon steel box girder 61; the bottom formwork longitudinal beams 642 are vertically connected to the bottom formwork cross beams 641, and the bottom formwork longitudinal beams 642 are located on the upper side of the bottom formwork cross beams 641; the bottom formwork panel 643 is placed on the upper side of the bottom formwork longitudinal beams 642, and a detachable temporary connection is adopted between the bottom formwork panel 643 and the bottom formwork longitudinal beams 642, which is convenient for formwork removal.

[0050] Preferably, in the above-mentioned integral sliding steel platform system for circular deep foundation pits, the operation platform 66 is arranged above the bottom formwork longitudinal beams 642, and the operation platform 66 is located inside the bottom formwork longitudinal beams 642. By arranging the operation platform 66, it is convenient for workers to construct.

[0051] Preferably, in the above-mentioned integral sliding steel platform system for circular deep foundation pits, the platform guardrail 67 includes a guardrail sleeve 671 and a guardrail unit 672. The guardrail sleeve 671 is vertically fixed at the end of the bottom formwork cross beam 641, and the vertical rods on both sides of the guardrail unit 672 are connected with the guardrail sleeve 671 by a ferrule, which can facilitate the quick disassembly and reliable connection between the vertical rods on both sides of the guardrail unit 672 and the guardrail sleeve 671.

[0052] Preferably, in the above-mentioned integral sliding steel platform system for circular deep foundation pits, the equipment platform 68 includes a platform cross beam 681 and an equipment platform plate 682 for setting mechanical equipment. The platform cross beam 681 is fixed on the upper side of the straight section steel box girder 611 and horizontally extends inward for a certain distance, and the equipment platform plate 682 is fixed on the upper side of the platform cross beam 681. Mechanical equipment such as a hydraulic power system, an excavator robotic arm, a soil extraction box, and a tower ladder converted from a construction elevator can be set on the equipment platform 68.

[0053] Preferably, in the above-mentioned integral sliding-down steel platform system for circular deep foundation pits, the oil cylinder assembly 62 includes an oil cylinder support 621 and a hydraulic oil cylinder 622, and the two are hinged. The oil cylinder support 621 is hinged to the straight-section steel box girder 611 and is located outside the regular polygon steel box girder 61. The hydraulic oil cylinder 622 is controlled by a hydraulic power system. The oil cylinder assembly 62 of the hydraulic oil cylinder 622 is arranged outside the regular polygon steel box girder 61, which can apply a pre-pressure to the inner wall of the cylindrical diaphragm wall 1 and play a role in temporary support.

[0054] In summary, for the integral sliding-down steel platform system for circular deep foundation pits provided by the present invention, in order to adapt to the circular inner wall of the diving pool and follow the principle of facilitating processing and production, the method of cutting and straightening is adopted, and the main load-bearing member of the underground steel platform 6, the steel box girder, is designed as a regular polygon. The oil cylinder assembly 62 of the hydraulic oil cylinder 622 is arranged outside the regular polygon steel box girder 61, which can apply a pre-pressure to the inner wall of the cylindrical diaphragm wall 1 and play a role in temporary support. A bottom formwork system 64 and a side formwork system 65 are arranged on the regular polygon steel box girder 61 for concrete pouring. The bottom formwork panel 643 adopts a temporary connection method, which is convenient for demoulding; the side formwork system 65 adopts a formwork withdrawal device 652, thereby improving the automation and mechanization level of formwork withdrawal and reducing manual labor. An operation platform 66 and a guardrail are arranged inside the regular polygon steel box girder 61, which is convenient for workers to construct and ensure the safety of edge operations. An equipment platform 68 is arranged inside the operation platform 66, which is convenient for integrating mechanical equipment such as a hydraulic power system, an excavator robotic arm, a soil extraction box, and a tower ladder for converting with a construction elevator, thereby reducing the transfer work of equipment and facilities and improving work efficiency. A winch 4 is arranged on the first-floor ring beam 2 for the integral sliding-down construction of the underground steel platform 6. A steel platform support 8 is arranged on the cylindrical diaphragm wall 1, which can realize the force state conversion of the self-weight of the underground steel platform 6 from being borne by the steel wire rope 5 to being borne by the steel platform support 8, and improve the safety of the overall construction.

[0055] Please refer to Figures 1 to 23 , this embodiment discloses a construction method for a cylindrical diving pool, which adopts the above-mentioned integral sliding-down steel platform system for circular deep foundation pits. The method includes the following steps:

[0056] Step 1: Assemble the underground steel platform 6 on the ground. The underground steel platform 6 includes a regular polygon steel box girder 61, several oil cylinder assemblies 62, several lifting points 63, a formwork system, an operation platform 66, a platform guardrail 67, and an equipment platform 68. The regular polygon steel box girder 61 is composed of several straight-section steel box girders 611 spliced together. The lifting points 63 are fixedly connected to the inner side of the regular polygon steel box girder 61 at equal intervals. The oil cylinder assemblies 62 are arranged at equal intervals and vertically on the outer peripheral surface of the regular polygon steel box girder 61. The operation platform 66 is arranged inside the regular polygon steel box girder 61 and forms a circle. The platform guardrail 67 is arranged on the side of the operation platform 66 away from the regular polygon steel box girder 61 and forms a circle. The equipment platform 68 is arranged on the side of the operation platform 66 away from the regular polygon steel box girder 61. The formwork system is arranged on the regular polygon steel box girder 61. The oil cylinder assembly 62 includes an oil cylinder support 621 and a hydraulic oil cylinder 622, and the two are hinged. The oil cylinder support 621 is hinged to the straight-section steel box girder 611 and is located outside the regular polygon steel box girder 61. The hydraulic oil cylinder 622 is controlled by a hydraulic power system;

[0057] Step 2: After the construction of the cylindrical diaphragm wall 1 is completed and meets the excavation conditions, excavate the soil inside the cylindrical diaphragm wall 1 to a certain depth;

[0058] Step 3: Install several steel platform supports 8 on the inner wall of the cylindrical diaphragm wall 1, hoist the underground steel platform 6 and make the regular polygon steel box girder 61 supported on the steel platform supports 8;

[0059] Step 4: Hoist the steel reinforcement cage 9, pour concrete using the formwork system, and complete the construction of the first-floor ring beam 2;

[0060] Step 5: After the first-floor ring beam 2 meets the strength requirements, install several winch supports 3 and winches 4 on the upper part of the first-floor ring beam 2, and connect the steel wire ropes 5 on the winches 4 to the lifting points 63 of the underground steel platform 6;

[0061] Step 6: Continue to excavate the soil to a certain depth, move the steel platform supports 8 downward and install them on the inner wall of the cylindrical diaphragm wall 1 corresponding to the next construction section, operate the winch 4, lower the underground steel platform 6, and make the regular polygon steel box girder 61 supported on the steel platform supports 8;

[0062] Step 7: Operate the hydraulic power system to make the hydraulic oil cylinder 622 extend and support on the inner wall of the cylindrical diaphragm wall 1 with a certain pre-pressure to play a role of temporary support;

[0063] Step 8: Hoist the steel reinforcement cage 9 into place and the formwork system into place;

[0064] Step 9: Operate the hydraulic power system to contract the hydraulic cylinder 622, cancel the pre-pressure applied to the inner wall of the cylindrical diaphragm wall 1, so that the self-weight of the underground steel platform 6 is fully borne by the steel platform support 8;

[0065] Step 10: Pour concrete to complete the construction of the reinforced concrete cylindrical wall 7 of the diving pool;

[0066] Step 11: Repeat Steps 6 to 10 until the designed depth of the cylindrical diving pool is reached. Dismantle the underground steel platform 6 and lift it out of the cylinder to the ground, and complete the pouring of the bottom slab of the cylindrical diving pool, thereby realizing the construction of the cylindrical diving pool.

[0067] In the construction method of the cylindrical diving pool provided by the present invention, a winch 4 is arranged on the first-floor ring beam 2 for the overall sliding down construction of the underground steel platform 6. By using the formwork system of the underground steel platform 6, the pouring of the cylindrical diving pool from top to bottom can be realized; by arranging the steel platform support 8 on the cylindrical diaphragm wall 1 and arranging the cylinder assembly 62 on the outer peripheral surface of the regular polygon steel box girder 61, the force state conversion of the self-weight of the underground steel platform 6 from being stressed by the steel wire rope 5 to being borne by the steel platform support 8 can be realized, improving the safety of the overall construction. By integrating the pre-pressurized cylinder assembly 62, the operation platform 66, the formwork system, and the equipment platform 68 on the underground steel platform 6, the installation and disassembly frequency of equipment and facilities can be reduced, and the construction efficiency, mechanization and automation level, and reuse rate can be effectively improved.

[0068] Preferably, in the above construction method of the cylindrical diving pool, the formwork system includes a bottom formwork system 64 and a side formwork system 65. The bottom formwork system 64 is arranged on the upper side of the regular polygon steel box girder 61, and the side formwork system 65 is arranged on the upper side of the bottom formwork system 64. The side formwork system 65 includes a plurality of formwork units 651 and a plurality of formwork withdrawal devices 652. Each formwork unit 651 is installed on the upper side of the bottom formwork system 64 through the corresponding formwork withdrawal device 652. After all the formwork units 651 are closed by the formwork withdrawal devices 652, they can enclose a cylindrical structure. Since the side formwork system 65 adopts the formwork withdrawal device 652, the automation and mechanization level of formwork withdrawal are improved, and manual labor is reduced. The formwork withdrawal device 652 is a common technical means in the art and will not be elaborated here. For example, the opening and closing formwork device disclosed in Chinese Patent CN111287454A on June 16, 2020 can be adopted.

[0069] Preferably, in the above construction method of the cylindrical diving pool, the bottom formwork system 64 includes bottom formwork cross beams 641, bottom formwork longitudinal beams 642, and a bottom formwork panel 643. The bottom formwork cross beams 641 are rigidly connected to the regular polygon steel box girder 61 and are located on the upper side of the regular polygon steel box girder 61. The bottom formwork longitudinal beams 642 are perpendicularly connected to the bottom formwork cross beams 641, and the bottom formwork longitudinal beams 642 are located on the upper side of the bottom formwork cross beams 641. The bottom formwork panel 643 is placed on the upper side of the bottom formwork longitudinal beams 642, and a temporary connection is adopted between the bottom formwork panel 643 and the bottom formwork longitudinal beams 642 to facilitate form removal.

[0070] Preferably, in the above construction method of the cylindrical diving pool, in step 4, the steel reinforcement cage 9 is hoisted onto the bottom formwork system 64. On the premise of ensuring that the bottom formwork system 64 and the side formwork system 65 are installed and supported in place, the casting construction of the first-floor ring beam 2 is completed.

[0071] In step 5, after the first-floor ring beam 2 meets the strength requirements, the formwork withdrawal device 652 is operated to achieve the interval formwork withdrawal of the formwork units 651.

[0072] In step 8, first, the bottom formwork system 64 is installed to position the bottom formwork panel 643, then the steel reinforcement cage 9 is hoisted into position, the formwork withdrawal device 652 is operated to achieve the closing of the formwork units 651, and the formwork units 651 are locked and reinforced to achieve the positioning of the formwork system.

[0073] In step 10, after the reinforced concrete cylindrical wall 7 of the diving pool meets the strength requirements, the formwork withdrawal device 652 is operated to achieve the interval formwork withdrawal of the formwork units 651.

[0074] Preferably, in the above construction method of the cylindrical diving pool, the operation platform 66 is arranged above the bottom formwork longitudinal beams 642, and the operation platform 66 is located inside the bottom formwork longitudinal beams 642.

[0075] Preferably, in the above construction method of the cylindrical diving pool, the platform guardrail 67 includes a guardrail sleeve 671 and guardrail units 672. The guardrail sleeve 671 is vertically fixed at the end of the bottom formwork cross beam 641, and the vertical rods on both sides of the guardrail unit 672 are connected to the guardrail sleeve 671 by a hoop connection, which can facilitate the quick disassembly and reliable connection between the vertical rods on both sides of the guardrail unit 672 and the guardrail sleeve 671.

[0076] Preferably, in the above construction method of the cylindrical diving pool, the equipment platform 68 includes a platform cross beam 681 and an equipment platform plate 682 for setting mechanical equipment. The platform cross beam 681 is fixed on the upper side of the straight-section steel box girder 611 and horizontally extends inward for a certain distance, and the equipment platform plate 682 is fixed on the upper side of the platform cross beam 681.

[0077] Preferably, in the construction method of the above-mentioned cylindrical diving pool, a hydraulic power system, an excavator robotic arm, a soil collection box, and a tower ladder converted from a construction elevator are provided on the equipment platform 68.

[0078] In summary, for the integral sliding steel platform system for a circular deep foundation pit provided by the present invention, in order to adapt to the circular inner wall of the diving pool and follow the principle of facilitating processing and production, the method of straightening by cutting curves is adopted, and the main stress member, the steel box girder of the underground steel platform 6, is designed as a regular polygon. A hydraulic cylinder 622 and a cylinder assembly 62 are arranged on the outer side of the regular polygon steel box girder 61, which can apply a pre-pressure to the inner wall of the cylindrical diaphragm wall 1 to play a role of temporary support. A bottom formwork system 64 and a side formwork system 65 are arranged on the regular polygon steel box girder 61 for concrete pouring. The bottom formwork panel 643 is connected in a temporary manner to facilitate demoulding; the side formwork system 65 adopts a formwork withdrawal device 652, thereby improving the automation and mechanization level of formwork withdrawal and reducing manual labor. An operation platform 66 and a guardrail unit 672 are arranged on the inner side of the regular polygon steel box girder 61 to facilitate the construction of workers and ensure the safety of edge operations. An equipment platform 68 is arranged on the inner side of the operation platform 66 to facilitate the integration of mechanical equipment such as a hydraulic power system, an excavator robotic arm, a soil collection box, and a tower ladder converted from a construction elevator, thereby reducing the transfer work of equipment and facilities and improving work efficiency. A winch 4 is arranged on the first-floor ring beam 2 for the integral sliding construction of the underground steel platform 6. A steel platform support 8 is arranged on the cylindrical diaphragm wall 1, which can realize the force state conversion of the self-weight of the underground steel platform 6 from being borne by the steel wire rope 5 to being borne by the steel platform support 8, and improve the safety of the overall construction.

[0079] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the field of the present invention based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A construction method for a cylindrical diving pool, characterized in that, It includes the following steps: Step 1: Assemble the underground steel platform on the ground. The underground steel platform includes a regular polygon steel box girder, several oil cylinder assemblies, several lifting points, a formwork system, a working platform, a platform guardrail, and an equipment platform. The regular polygon steel box girder is composed of several straight-section steel box girders spliced together. The lifting points are fixedly connected to the inner side of the regular polygon steel box girder at equal intervals. The oil cylinder assemblies are arranged at equal intervals and vertically on the outer peripheral surface of the regular polygon steel box girder. The working platform is arranged on the inner side of the regular polygon steel box girder and forms a circle. The platform guardrail is arranged on the side of the working platform away from the regular polygon steel box girder and forms a circle. The equipment platform is arranged on the side of the working platform away from the regular polygon steel box girder. The formwork system is arranged on the regular polygon steel box girder. The oil cylinder assembly includes an oil cylinder support and a hydraulic cylinder, and the two are hinged. The oil cylinder support is hinged to the straight-section steel box girder and is located outside the regular polygon steel box girder. The hydraulic cylinder is controlled by a hydraulic power system; Step 2: After the construction of the cylindrical diaphragm wall is completed and meets the excavation conditions, excavate the soil inside the cylindrical diaphragm wall to a certain depth; Step 3: Install several steel platform supports on the inner wall of the cylindrical diaphragm wall, hoist the underground steel platform and make the regular polygon steel box girder supported on the steel platform supports; Step 4: Hoist the steel reinforcement cage and pour concrete using the formwork system to complete the construction of the first-floor ring beam; Step 5: After the first-floor ring beam meets the strength requirements, install several winch supports and winches on the upper part of the first-floor ring beam, and connect the steel wire ropes on the winches to the lifting points of the underground steel platform; Step 6: Continue to excavate the soil to a certain depth, move the steel platform supports downward to the inner wall of the cylindrical diaphragm wall corresponding to the next construction section, operate the winch, lower the underground steel platform, and make the regular polygon steel box girder supported on the steel platform supports; Step 7: Operate the hydraulic power system to extend the hydraulic cylinders to support on the inner wall of the cylindrical diaphragm wall with a certain pre-pressure to play a role in temporary support; Step 8: Hoist the steel reinforcement cage in place and position the formwork system; Step 9: Operate the hydraulic power system to contract the hydraulic cylinders, cancel the pre-pressure applied on the inner wall of the cylindrical diaphragm wall, and make the self-weight of the underground steel platform entirely borne by the steel platform supports; Step 10: Pour concrete to complete the construction of the reinforced concrete cylindrical wall of the diving pool; Step 11: Repeat Steps 6 to 10 until the designed depth of the cylindrical diving pool is reached, disassemble the underground steel platform, hoist it out of the cylinder to the ground, and complete the pouring of the bottom slab of the cylindrical diving pool, thereby realizing the construction of the cylindrical diving pool.

2. The construction method of the cylindrical diving pool according to claim 1, characterized in that, The formwork system includes a bottom formwork system and a side formwork system. The bottom formwork system is arranged on the upper side of the regular polygon steel box girder. The side formwork system is arranged on the upper side of the bottom formwork system. The side formwork system includes several formwork units and several formwork withdrawal devices. Each formwork unit is installed on the upper side of the bottom formwork system through the corresponding formwork withdrawal device. After all the formwork units are closed by the formwork withdrawal devices, they can form a cylindrical structure.

3. The construction method of the cylindrical diving pool according to claim 2, characterized in that, The bottom formwork system includes bottom formwork cross beams, bottom formwork longitudinal beams and a bottom formwork panel. The bottom formwork cross beams are rigidly connected to the regular polygon steel box girder and are located on the upper side of the regular polygon steel box girder; the bottom formwork longitudinal beams are perpendicularly connected to the bottom formwork cross beams and are located on the upper side of the bottom formwork cross beams; the bottom formwork panel is placed on the upper side of the bottom formwork longitudinal beams, and a temporary connection is adopted between the bottom formwork panel and the bottom formwork longitudinal beams.

4. The construction method of the cylindrical diving pool according to claim 3, characterized in that In step 4, hoist the steel reinforcement cage onto the bottom formwork system, and complete the casting construction of the first-floor ring beam on the premise of ensuring the installation and support in place of the bottom formwork system and the side formwork system. In step 5, after the first-floor ring beam meets the strength requirements, operate the formwork removal device to achieve the interval formwork removal of the formwork units. In step 8, first install the bottom formwork system to place the bottom formwork panel in place, then hoist the steel reinforcement cage in place, operate the formwork removal device to achieve the formwork closing of the formwork units, and lock and reinforce the formwork units to achieve the in-place of the formwork system. In step 10, after the reinforced concrete cylindrical wall of the diving pool meets the strength requirements, operate the formwork removal device to achieve the interval formwork removal of the formwork units.

5. The construction method of the cylindrical diving pool according to claim 3, characterized in that, The operation platform is arranged above the bottom formwork longitudinal beams and is located inside the bottom formwork longitudinal beams.

6. The construction method of the cylindrical diving pool according to claim 1, characterized in that The platform guardrail includes guardrail sleeves and guardrail units. The guardrail sleeves are vertically fixed at the ends of the bottom formwork cross beams, and the vertical rods on both sides of the guardrail units are connected to the guardrail sleeves by hoop.

7. The construction method of the cylindrical diving pool according to claim 1, characterized in that, The equipment platform includes platform cross beams and an equipment platform plate for setting mechanical equipment. The platform cross beams are fixed on the upper side of the straight-section steel box girder and horizontally extend inward for a certain distance, and the equipment platform plate is fixed on the upper side of the platform cross beams.

8. The construction method of the cylindrical diving pool according to claim 1, characterized in that, A hydraulic power system, an excavator robotic arm, a soil collection box and a tower ladder converted from a construction elevator are arranged on the equipment platform.

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