Nuclear power engineering key equipment circular hole template support system and construction method thereof

Abstract

The application provides a nuclear power engineering key equipment circular hole template support system and a construction method thereof, which comprises at least two door type steel frames arranged side by side, the inner surfaces of arc-shaped steel templates are uniformly provided with a plurality of steel pipes, the two ends of the steel pipes extend out of the two ends of the arc-shaped steel templates, and the plurality of steel pipes are connected with the door type steel frames through a plurality of high-strength pull rods. The high-strength pull rods can be adjusted to a horizontal or vertical state according to needs. The design enables the other end of the pull rod to smoothly pass through the door type steel frame and be anchored by using a butterfly nut and a steel bar anchoring block, so that the load is effectively decomposed into horizontal force and vertical force, and the overall stability and reliability of the template system are greatly enhanced. The door type steel template support system not only improves the safety in the construction process, but also enhances the stability of the template system and the overall quality of the structure, and is a more efficient and reliable construction scheme.

Description

Technical Field

[0001] This invention relates to the field of circular opening formwork support, and in particular to a circular opening formwork support system for key equipment in nuclear power engineering and its construction method. Background Technology

[0002] Traditional formwork support systems for openings have some obvious limitations and shortcomings in construction, which can be summarized as follows:

[0003] In some engineering projects, especially those involving the installation of large equipment, certain critical pieces of equipment need to be hoisted into place early in the structural construction phase. Once the equipment is in place, the surrounding space will be occupied, making subsequent reinforcement work with internal support formwork difficult. This not only increases the complexity of the construction organization but may also affect the progress of structural construction.

[0004] In many cases, openings are not only part of the structure but also important passageways for personnel and materials on the construction site. Using internal supports would occupy space in these passageways, affecting personnel passage and material transport, and could pose a threat to safe evacuation, especially in emergencies.

[0005] Traditional formwork for openings, especially wooden formwork used for circular or other irregularly shaped openings, often has gaps at the joints, which can lead to grout leakage during concrete pouring. Grout leakage not only wastes materials but also reduces the overall quality and safety of the concrete structure. Furthermore, for irregularly shaped openings, wooden formwork is difficult to precisely match the opening shape, further exacerbating this problem.

[0006] In summary, traditional formwork support systems for openings have significant shortcomings in meeting the needs of modern engineering, particularly in terms of flexibility, efficiency, and quality control. These issues have prompted the industry to seek more advanced and efficient solutions, such as the application of new technologies like portal steel formwork support systems. Summary of the Invention

[0007] The main objective of this invention is to provide a circular opening formwork support system and its construction method for key equipment in nuclear power engineering, which solves the obvious shortcomings of traditional opening formwork support systems in adapting to modern engineering needs, especially in terms of flexibility, efficiency and quality control.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a support system for a circular opening template of a key equipment in nuclear power engineering, including at least two portal steel frames arranged side by side, multiple steel pipes evenly arranged on the inner surface of the arc-shaped steel template, with both ends of the steel pipes extending out of both ends of the arc-shaped steel template, and the multiple steel pipes connected to the portal steel frames through multiple high-strength tie rods.

[0009] In the preferred embodiment, the portal steel frame consists of two steel frames arranged side by side, with a gap between the two steel frames. One end of the high-strength tie rod is connected to the steel pipe, and the other end passes through the gap on the portal steel frame and is connected to the wing nut.

[0010] In the preferred embodiment, a circular collar is also provided, which is fitted onto the steel pipe and connected to at least one high-strength tie rod.

[0011] In the preferred embodiment, the circular collar has one or more limiting grooves, a rotating ring is rotatably connected inside the limiting groove, and a connecting rod is provided on the rotating ring, which is connected to one end of the high-strength tie rod.

[0012] In the preferred embodiment, both ends of the high-strength tie rod are threaded, one end of the high-strength tie rod is threaded to the connecting rod on the rotating ring, and a hexagonal rotating structure is provided near the threaded end of the high-strength tie rod.

[0013] In the preferred embodiment, the other end of the high-strength tie rod passes through the gap in the portal steel frame and the steel pad and is threadedly connected to the wing nut.

[0014] In the preferred embodiment, when the circular collar is connected to the two high-strength tie rods, the two high-strength tie rods pass through the gaps on the top and sides of the portal steel frame and the steel pads, respectively, and are threaded to the wing nuts.

[0015] In the preferred embodiment, tensioning tubes are arranged side by side at the base of the bottom of the arc-shaped steel formwork. The two ends of the tensioning tubes extend out of the two ends of the arc-shaped steel formwork. One side of the two tensioning tubes is connected to the inner surface of the arc-shaped steel formwork, and the other side abuts against the tension plate. One end of the tie rod reinforcing bar passes between the two tensioning tubes and through the tension plate. The other end of the tie rod reinforcing bar passes through the portal steel frame and the steel pad. Both ends of the tie rod reinforcing bar are provided with reinforcing bar anchor blocks. The reinforcing bar anchor blocks are threadedly connected to the tie rod reinforcing bar. The two reinforcing bar anchor blocks abut against the tension plate and the steel pad respectively.

[0016] In the preferred embodiment, the inner surface of the pull plate is provided with an arc-shaped groove that matches the tensioning tube.

[0017] The method includes:

[0018] S1. When constructing the lower half of the opening, pre-embed steel brackets in the wall and weld the portal steel frame to the steel brackets;

[0019] S2. Based on the center positioning of the hole, the arc-shaped steel template is temporarily fixed with sleepers, and care is taken to control the deformation of the arc-shaped steel template during the process;

[0020] S3. Arrange the steel pipes at equal intervals on the arc-shaped steel formwork, and weld the arc-shaped steel formwork to the steel pipes for fixation. Weld tension pipes at the base of the arc-shaped steel formwork, and leave a distance between the tension pipes to facilitate the passage of the tie rod reinforcement.

[0021] S4. A circular ring is fitted onto the steel pipe. A high-strength tie rod is welded or threaded onto the rotating ring of the circular ring. A high-strength tie rod is installed at the top of the arc-shaped steel formwork. At least two high-strength tie rods are installed on each steel pipe on the side of the arc-shaped steel formwork.

[0022] S5. The vertical and horizontal high-strength tie rods pass through the top and side of the portal steel frame and are threaded to the wing nuts. The wing nuts adjust the tension of the high-strength tie rods.

[0023] S6. After the entire curved steel formwork is fixed, tighten and fix the root of the curved steel formwork.

[0024] S7. Install a tie plate on the tension tube. One end of the tie rod reinforcing bar passes through the tie plate, and the other end passes through the portal steel frame and steel pad. Install reinforcing bar anchor blocks at both ends of the tie rod reinforcing bar. The reinforcing bar anchor blocks are threaded to both ends of the tie rod reinforcing bar. Rotate the reinforcing bar anchor blocks to tighten the root position of the arc-shaped steel formwork.

[0025] This invention provides a support system for the formwork of a circular opening in a key piece of nuclear power engineering and its construction method, which improves structural safety: when constructing the lower part of the opening, steel brackets are pre-embedded in the wall and a portal steel frame is welded to the steel brackets, which can effectively reduce the height of the frame and thus improve the safety of the entire structure.

[0026] Enhanced formwork rigidity: Using curved steel formwork as formwork provides greater rigidity compared to traditional wooden formwork. This allows it to better resist the self-weight of the concrete and the lateral pressure generated during pouring, ensuring the quality of the concrete structure.

[0027] Improving the stability of the formwork system: High-strength tie rods are connected to steel pipes via circular ring clamps. The mobility and adjustability of the circular ring clamps allow the high-strength tie rods to be adjusted to a horizontal or vertical position as needed. This design allows the other end of the tie rod to pass smoothly through the portal steel frame and be anchored using wing nuts and steel reinforcement anchor blocks, thereby effectively decomposing the load into horizontal and vertical forces, greatly enhancing the overall stability and reliability of the formwork system.

[0028] In conclusion, the portal steel formwork support system not only improves safety during construction but also enhances the stability of the formwork system and the overall quality of the structure, making it a more efficient and reliable construction solution. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0030] Figure 1 This is the main structural view of the portal steel frame of the present invention;

[0031] Figure 2 This is a general appearance structural diagram of the portal steel frame layout of the present invention;

[0032] Figure 3 This is a structural diagram of a single tie rod at the top of the arc-shaped steel formwork of the present invention;

[0033] Figure 4 This is a left-side view of the installation structure of the two high-strength tie rods on the side of the arc-shaped steel template of the present invention;

[0034] Figure 5 This is a right-side view of the installation structure of the two high-strength tie rods on the side of the arc-shaped steel template of the present invention;

[0035] Figure 6 This is a disassembled structural diagram of the circular ring collar of the present invention;

[0036] Figure 7 This is a main view of the tension tube installation structure of the present invention;

[0037] Figure 8 This is a side view of the tension tube installation structure of the present invention.

[0038] In the diagram: 1. Steel bracket; 2. Portal steel frame; 3. Steel pipe; 4. Arc-shaped steel formwork; 5. High-strength tie rod; 6. Reinforcing bar anchor block; 7. Wing nut; 8. Tie rod reinforcement; 9. Steel pad; 10. Circular ring collar; 1001. Rotating ring; 1002. Connecting rod; 1003. Limiting groove; 11. Pull plate; 12. Tensioning pipe. Detailed Implementation

[0039] Example 1

[0040] like Figures 1-8 As shown, a support system for a circular opening formwork of a key equipment in a nuclear power plant includes at least two parallel portal steel frames 2. Multiple steel pipes 3 are evenly arranged on the inner surface of an arc-shaped steel formwork 4. The two ends of the steel pipes 3 extend out of the two ends of the arc-shaped steel formwork 4. The multiple steel pipes 3 are connected to the portal steel frames 2 through multiple high-strength tie rods 5.

[0041] The system mainly comprises at least two parallel portal steel frames 2, curved steel formwork 4, steel pipes 3, and high-strength tie rods 5. Multiple steel pipes 3 are evenly distributed inside the curved steel formwork 4, with both ends extending beyond the formwork. These steel pipes 3 are connected to the portal steel frames 2 via multiple high-strength tie rods 5. The steel pipes 3 are arranged at equal intervals on the curved steel formwork 4 and fixed to the formwork by welding; this design enhances the rigidity and overall stability of the formwork.

[0042] The two high-strength tie rods 5 can be adjusted to be horizontal and vertical, allowing the other end to pass through the portal steel frame 2 and be anchored by the wing nut 7 and the steel bar anchor block 6, effectively decomposing the load into horizontal and vertical forces, significantly improving the overall stability and safety of the formwork system.

[0043] Multiple steel pipes 3 are evenly arranged on the inner surface, with both ends of these steel pipes extending beyond the ends of the template. The steel pipes 3 are fixed to the curved steel template 4 by welding, which enhances the overall rigidity and stability of the template.

[0044] In the preferred embodiment, the portal steel frame 2 consists of two parallel steel frames with a gap between them. One end of the high-strength tie rod 5 is connected to the steel pipe 3, and the other end passes through the gap in the portal steel frame 2 and connects to the wing nut 7. It consists of two parallel steel frames with a certain gap between them.

[0045] This design allows one end of the high-strength tie rod 5 to pass through this gap and connect with the wing nut 7, facilitating installation and adjustment.

[0046] The gap design between the portal steel frames 2 facilitates the installation of the high-strength tie rods 5, while the wing nuts 7 simplify the tightening process and improve construction efficiency.

[0047] In the preferred embodiment, a circular collar 10 is also provided, which is fitted onto the steel pipe 3 and connected to at least one high-strength tie rod 5.

[0048] The high-strength tie rod 5 can be adjusted to a horizontal or vertical position by means of the movable and adjustable circular collar 10, so that the other end can pass through the portal steel frame 2 and be anchored with the wing nut 7 and the steel bar anchor block 6.

[0049] In the preferred embodiment, the circular collar 10 has one or more limiting grooves 1003, and a rotating ring 1001 is rotatably connected inside the limiting groove 1003. The rotating ring 1001 is provided with a connecting rod 1002, and the connecting rod 1002 is connected to one end of the high-strength tie rod 5.

[0050] The circular collar 10 is provided with one or more limiting grooves 1003. These limiting grooves are used to accommodate and fix the position of the rotating ring 1001, ensuring that it can rotate freely within a specific range without falling off.

[0051] The rotating ring 1001 is located inside the limiting groove 1003 and can rotate freely within this groove. The design of the rotating ring 1001 allows the high-strength tie rod 5 to be adjusted to a horizontal or vertical position as needed, thereby facilitating the installation and fixation of the other end through the portal steel frame 2.

[0052] One end of the connecting rod 1002 is connected to the rotating ring 1001, and the other end is connected to one end of the high-strength tie rod 5. The function of the connecting rod 1002 is to connect the rotating ring 1001 and the high-strength tie rod 5 to achieve linkage between the two.

[0053] The design of the limiting groove 1003 and the rotating ring 1001 of the circular sleeve 10 allows the high-strength tie rod 5 to be adjusted to different positions according to actual needs, enhancing the system's adaptability and adjustability.

[0054] The rotating ring 1001 is connected to the high-strength tie rod 5 by the connecting rod 1002, which makes it easier for the high-strength tie rod 5 to pass through the portal steel frame 2, simplifying the installation process.

[0055] In the preferred embodiment, both ends of the high-strength tie rod 5 are threaded. One end of the high-strength tie rod 5 is threadedly connected to the connecting rod 1002 on the rotating ring 1001, and a hexagonal rotating structure is also provided near the threaded end of the high-strength tie rod 5. The threaded connection facilitates quick assembly and disassembly between the high-strength tie rod 5 and the connecting rod 1002, improving construction efficiency.

[0056] A hexagonal rotating structure is also provided near the threaded end of the high-strength tie rod 5. This design facilitates the use of tools such as wrenches to rotate the high-strength tie rod 5, thereby tightening or loosening the threaded connection.

[0057] The high-strength tie rod 5 can be quickly assembled or disassembled with the connecting rod 1002 via a threaded connection, simplifying the installation process. The hexagonal rotating structure design allows the high-strength tie rod 5 to be easily rotated using tools such as wrenches, facilitating adjustment of its position and tightness, and improving construction flexibility.

[0058] In the preferred embodiment, the other end of the high-strength tie rod 5 passes through the gap of the portal steel frame 2 and the steel pad 9 and is threadedly connected to the wing nut 7.

[0059] After the other end of the high-strength tie rod 5 passes through the gap in the portal steel frame 2, it also needs to pass through the steel pad 9. The function of the steel pad 9 is to increase the contact area, distribute the pressure of the high-strength tie rod 5 on the portal steel frame 2, and prevent excessive local stress from causing structural damage.

[0060] The wing nut 7 rests against the steel pad 9. By rotating the wing nut 7, the tension of the high-strength tie rod 5 can be adjusted to ensure the stability of the template system.

[0061] The steel pad 9 increases the contact area, dispersing the pressure of the high-strength tie rod 5 on the portal steel frame 2 and improving the overall structural stability. The use of the wing nut 7 allows for precise adjustment of the tension of the high-strength tie rod 5, ensuring the stability and safety of the formwork system during concrete pouring.

[0062] In the preferred embodiment, when the circular collar 10 is connected to the two high-strength tie rods 5, the two high-strength tie rods 5 pass through the gaps on the top and sides of the portal steel frame 2 and the steel pad 9 respectively and are threadedly connected to the wing nut 7.

[0063] like Figure 2 ,4 As shown in Figure 5, the two high-strength tie rods 5 can be adjusted to be horizontal and vertical, allowing the other end to pass through the portal steel frame 2 and be anchored using wing nuts 7 and steel bar anchor blocks 6. The connection between the two high-strength tie rods 5 and the portal steel frame 2 effectively decomposes the load into horizontal and vertical forces, significantly improving the overall stability and safety of the formwork system.

[0064] The two high-strength tie rods 5 can be adjusted to different positions according to actual needs, enhancing the system's adaptability and adjustability. The gap design on the top and sides of the portal steel frame 2 facilitates the installation of the high-strength tie rods 5, while the wing nuts 7 simplify the tightening process and improve construction efficiency.

[0065] In the preferred embodiment, tensioning tubes 12 are arranged side by side at the base positions on both sides of the bottom of the arc-shaped steel formwork 4. The two ends of the tensioning tubes 12 extend out of the two ends of the arc-shaped steel formwork 4. One side of the two tensioning tubes 12 is connected to the inner surface of the arc-shaped steel formwork 4, and the other side abuts against the tie plate 11. One end of the tie rod reinforcing bar 8 passes between the two tensioning tubes 12 and through the tie plate 11. The other end of the tie rod reinforcing bar 8 passes through the portal steel frame 2 and the steel pad 9. Both ends of the tie rod reinforcing bar 8 are provided with reinforcing bar anchor blocks 6. The reinforcing bar anchor blocks 6 are threadedly connected to the tie rod reinforcing bar 8. The two reinforcing bar anchor blocks 6 abut against the tie plate 11 and the steel pad 9 respectively.

[0066] The combined use of tensioning pipe 12, tension plate 11, tie rod 8, and rebar anchor block 6 effectively tightens the root position of the curved steel formwork 4, ensuring the stability of the formwork. The design of tensioning pipe 12 and tie rod 8 enhances the overall rigidity of the formwork, enabling it to withstand greater concrete self-weight and lateral pressure generated during pouring. The gap design on the top and sides of the portal steel frame 2 facilitates the installation of high-strength tie rods 5 and tie rod 8, while the rebar anchor block 6 simplifies the tightening process and improves construction efficiency. The tension of the tie rod 8 can be adjusted by rotating the rebar anchor block 6, enhancing the system's adaptability and adjustability.

[0067] In a preferred embodiment, the inner surface of the pull plate 11 is provided with an arc-shaped groove that matches the tension tube 12. This design allows the pull plate 11 to better fit the tension tube 12, enhancing the stability of the connection.

[0068] Example 2

[0069] Further explanation in conjunction with Example 1, such as Figure 1-8 The method, as shown in the diagram, includes:

[0070] S1. When constructing the lower half of the opening, pre-embed steel bracket 1 in the wall and weld the portal steel frame 2 onto the steel bracket 1;

[0071] S2. Based on the center positioning of the hole, the arc-shaped steel template 4 is temporarily fixed with sleepers. During the process, attention should be paid to controlling the deformation of the arc-shaped steel template 4.

[0072] S3. Arrange the steel pipes 3 at equal intervals on the arc-shaped steel template 4, and weld the arc-shaped steel template 4 to the steel pipes 3 for fixation. Weld the tensioning pipes 12 at the foot of the arc-shaped steel template 4, and leave a distance between the tensioning pipes 12 to facilitate the passage of the tie rod reinforcement 8.

[0073] S4. A circular ring 10 is fitted onto the steel pipe 3. A high-strength tie rod 5 is welded or threaded onto the rotating ring 1001 of the circular ring 10. A high-strength tie rod 5 is installed at the top of the arc-shaped steel template 4. At least two high-strength tie rods 5 are installed on each steel pipe 3 on the side of the arc-shaped steel template 4.

[0074] S5, the vertical and horizontal high-strength tie rods 5 pass through the top and side of the portal steel frame 2 respectively and are threaded to the wing nut 7. The wing nut 7 adjusts the tension of the high-strength tie rod 5.

[0075] S6. After the entire curved steel formwork 4 is fixed, tighten and fix the root of the curved steel formwork 4.

[0076] S7. Install a tension plate 11 on the tension tube 12. One end of the tie rod reinforcing bar 8 passes through the tension plate 11, and the other end passes through the portal steel frame 2 and the steel pad 9. Install reinforcing bar anchor blocks 6 at both ends of the tie rod reinforcing bar 8. The reinforcing bar anchor blocks 6 are threaded to both ends of the tie rod reinforcing bar 8. Rotate the reinforcing bar anchor blocks 6 to tighten the root position of the arc-shaped steel template 4.

[0077] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A construction method for a formwork support system for a circular opening in a key piece of equipment in a nuclear power plant project, characterized by: The application relates to a steel formwork structure, which comprises at least two door-shaped steel frames (2) arranged side by side, and a plurality of steel pipes (3) arranged uniformly on the inner surface of an arc-shaped steel formwork (4); the two ends of the steel pipes (3) extend out of the two ends of the arc-shaped steel formwork (4); the plurality of steel pipes (3) are connected with the door-shaped steel frames (2) through a plurality of high-strength pull rods (5). The door-shaped steel frame (2) is composed of two steel frames arranged side by side, and a gap is left between the two steel frames; one end of the high-strength pull rod (5) is connected with the steel pipe (3), and the other end of the high-strength pull rod (5) passes through the gap in the door-shaped steel frame (2) and is connected with a butterfly nut (7). A circular ring sleeve hoop (10) is further arranged, the circular ring sleeve hoop (10) is sleeved on the steel pipe (3), and the circular ring sleeve hoop (10) is connected with at least one high-strength pull rod (5). The method comprises the following steps: S1, embedding a steel bracket (1) on the wall body when constructing the lower half of the hole, and welding the door-shaped steel frame (2) on the steel bracket (1); S2, positioning according to the hole center, temporarily fixing the arc-shaped steel formwork (4) by using sleepers, and controlling the deformation of the arc-shaped steel formwork (4) in the process; S3, arranging the steel pipes (3) on the arc-shaped steel formwork (4) at equal intervals, and welding and fixing the arc-shaped steel formwork (4) and the steel pipes (3); welding a tension pipe (12) at the root position of the arc-shaped steel formwork (4), and leaving a distance between the tension pipes (12) to facilitate the pull rod steel bars (8) to pass through; S4, the steel pipe (3) is sleeved with a circular ring sleeve hoop (10), a rotating ring (1001) of the circular ring sleeve hoop (10) is welded or threadedly connected with the high-strength pull rod (5), one high-strength pull rod (5) is arranged at the top position of the arc-shaped steel formwork (4), and at least two high-strength pull rods (5) are arranged on each steel pipe (3) at the side position of the arc-shaped steel formwork (4); S5, the vertical and horizontal high-strength pull rods (5) are respectively threadedly connected with the butterfly nut (7) through the top and side of the door-shaped steel frame (2), and the butterfly nut (7) adjusts the tension degree of the high-strength pull rod (5); S6, after the arc-shaped steel formwork (4) is fixed as a whole, the root part of the arc-shaped steel formwork (4) is fixed by tensioning; S7, installing a pull plate (11) on the tension pipe (12), one end of the pull rod steel bar (8) passes through the pull plate (11), the other end of the pull rod steel bar (8) passes through the door-shaped steel frame (2) and a steel pad plate (9), and a steel anchor block (6) is arranged at the two ends of the pull rod steel bar (8) respectively, the steel anchor block (6) is threadedly connected with the two ends of the pull rod steel bar (8), and the arc-shaped steel formwork (4) at the root position is tensioned by rotating the steel anchor block (6).

2. The construction method of the nuclear power engineering key equipment circular hole template support system according to claim 1, characterized in that: The circular ring sleeve hoop (10) is provided with one or more limiting grooves (1003), the limiting grooves (1003) are rotatably connected with rotating rings (1001) inside, the rotating rings (1001) are provided with connecting rods (1002), and the connecting rods (1002) are connected with one end of the high-strength pull rod (5).

3. The construction method of the nuclear power engineering key equipment circular hole template support system according to claim 1, characterized in that: The high-strength pull rod (5) is provided with threads at the two ends, one end of the high-strength pull rod (5) is threadedly connected with the connecting rod (1002) on the rotating ring (1001), and a hexagonal rotating structure is further arranged near the threaded end of the high-strength pull rod (5).

4. The construction method of the nuclear power engineering key equipment circular hole template support system according to claim 1, characterized in that: The other end of the high-strength pull rod (5) is threadedly connected with the butterfly nut (7) through the gap in the door-shaped steel frame (2) and the steel pad plate (9).

5. The construction method of the nuclear power engineering key equipment circular hole formwork support system according to claim 4, characterized in that: When the circular ring sleeve (10) is connected with the two high-strength pull rods (5), the two high-strength pull rods (5) pass through the gaps at the top and sides of the door-type steel frame (2) and are threadedly connected with the wing nuts (7) through the steel backing plates (9).

6. The construction method of the nuclear power engineering key equipment circular hole formwork support system according to claim 1, characterized in that: The two ends of the tension pipe (12) extend out of the two ends of the arc-shaped steel formwork (4), one side of the two tension pipes (12) is connected with the inner surface of the arc-shaped steel formwork (4), and the other side abuts against the pull plate (11). One end of the pull rod steel bar (8) passes through the two tension pipes (12) and the pull plate (11), the other end of the pull rod steel bar (8) passes through the door-type steel frame (2) and the steel backing plate (9), and the two ends of the pull rod steel bar (8) are both provided with the steel bar anchoring blocks (6) which are threadedly connected with the pull rod steel bar (8) and abut against the pull plate (11) and the steel backing plate (9) respectively.

7. The construction method of the nuclear power engineering key equipment circular hole template support system according to claim 1, characterized in that: The inner surface of the pull plate (11) is provided with an arc-shaped groove matched with the tension pipe (12).

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