A modular reinforcing cage external prefabrication tool for a nuclear-related thick wall structure and a construction method thereof

Abstract

The application discloses a kind of modularized reinforcement cage external prefabrication tool and construction method of nuclear thick wall structure, including ground beam and bottom longitudinal reinforcement positioning profiled steel beam;Ground beam is vertically arranged in the lower end of bottom longitudinal reinforcement positioning profiled steel beam, two columns are arranged above the middle of ground beam;Two top longitudinal reinforcement positioning locking profiled steel beams are symmetrically arranged in parallel between the top of two end columns;Between top longitudinal reinforcement positioning locking profiled steel beam and bottom longitudinal reinforcement positioning profiled steel beam, set up profiled steel comb, inverted F-shaped steel comb and longitudinal bearing channel steel;Transverse bearing pull rod is arranged at equal intervals between longitudinal bearing channel steel on front and back sides;Short hanger beam is arranged on top longitudinal reinforcement positioning locking profiled steel beam;Lifting lug is arranged above short hanger beam.The application can effectively realize the binding and hoisting of modularized reinforcement cage in thick wall structure with high stiffness, high precision and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, specifically to a modular prefabricated steel cage externally mounted tooling and construction method for nuclear-related thick wall structures. Background Technology

[0002] In the field of nuclear engineering, thick walls reinforced with densely packed large-diameter steel bars are the main load-bearing components in structures, widely used in various containment buildings, reactor buildings, and other critical structures. Currently, the construction of steel reinforcement in nuclear-related thick wall structures still mainly relies on traditional manual operation methods, using a method of tying individual steel bars one by one. This not only involves cumbersome work processes but also results in chaotic on-site material storage and poor coordination of procedures, leading to low construction efficiency and significant challenges in quality control. As nuclear engineering develops towards higher safety, higher quality, and higher efficiency, traditional construction methods can no longer meet the stringent requirements of modern large-scale nuclear power projects for schedule and precision.

[0003] In response to the national strategic need to promote the industrialization and intelligent transformation of major engineering projects, and to improve the quality and efficiency of steel reinforcement engineering, research on modular and prefabricated integrated steel cage construction technology has become an urgent issue for the industry.

[0004] In recent years, modular prefabrication and overall hoisting technology for steel cages has been gradually applied to nuclear-related projects. For example, Chinese invention patent application CN115613811A discloses a modular construction tooling and method for straight-wall steel cages. This method uses two parallel planar frame skeletons, which are connected to form a three-dimensional frame tooling with a steel reinforcement limiting structure. After the straight-wall steel cage is prefabricated and tied off-site, the steel cage and construction tooling are hoisted together to the pre-reserved steel reinforcement location on-site for connection. This technology has made some progress in reducing on-site steel reinforcement tying work, improving the efficiency of steel cage prefabrication, and achieving preliminary steel reinforcement positioning. However, based on the disclosed structure and construction method, there are still shortcomings. Problems such as inaccurate steel reinforcement positioning, low overall rigidity of the prefabricated tooling, large deformation of the steel cage during hoisting, and low construction efficiency still exist in the use of prefabricated tools for hoisting modular steel cages. Therefore, it is urgent to develop a modular steel cage complete construction technology with high rigidity, high precision, and easy assembly characteristics to support the transformation and upgrading of nuclear-related projects towards industrialization, standardization, and intelligence, and comprehensively improve project quality and construction efficiency. Summary of the Invention

[0005] In order to overcome the defects of the existing technology, the purpose of this invention is to provide a modular steel cage external prefabrication fixture and construction method for nuclear-related thick wall structures, which can effectively realize the binding and hoisting of modular steel cages in thick wall structures with high rigidity, high precision and high efficiency.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A modular, externally mounted prefabricated steel cage for nuclear-related thick wall structures includes a ground beam and two parallel and symmetrically arranged bottom longitudinal reinforcement positioning steel beams. The ground beam is vertically installed at both ends below the bottom longitudinal reinforcement positioning steel beam. Two columns are installed above the middle of the ground beam. The outside of the columns is fixed by diagonal bracing. One end of the diagonal bracing is installed in the middle of the column, and the other end is installed on the surface of the ground beam. Two top longitudinal reinforcement positioning and locking steel beams are symmetrically arranged between the tops of the columns at both ends; A multi-shaped steel bar comb, an inverted F-shaped steel bar comb, and a longitudinal bearing channel steel are installed between two parallel top longitudinal reinforcement positioning and locking steel beams and two parallel bottom longitudinal reinforcement positioning steel beams; The shaped steel bar comb includes two sets, with each set of shaped steel bar combs symmetrically arranged on both sides of the top longitudinal reinforcement positioning and locking steel beam and the bottom longitudinal reinforcement positioning steel beam; Multiple sets of inverted F-shaped steel bar combs and longitudinal bearing channel steel are set; each set of inverted F-shaped steel bar combs and longitudinal bearing channel steel are symmetrically set on both sides of the top longitudinal reinforcement positioning and locking steel beam and the bottom longitudinal reinforcement positioning steel beam; Transverse load-bearing tie rods are evenly spaced between the longitudinal load-bearing channel steels on the front and rear sides; The short lifting beam is set on the top longitudinal reinforcement positioning and locking steel beam; the lifting lug is set above the short lifting beam.

[0007] The ground beam includes a steel section and several stiffening ribs. Among them, the upper flange of the steel section is provided with several bolt holes 1 at both ends for connecting with the diagonal brace, and several bolt holes 2 and several bolt holes 3 in the middle of the upper flange of the steel section are provided for connecting with the column and the bottom longitudinal reinforcement positioning steel beam respectively; several stiffening ribs 1 are arranged between the upper and lower flanges of the steel section, located at the connection between the ground beam and the column and the ground beam and the diagonal brace.

[0008] The column includes two steel sections, several stiffening ribs, and a connecting plate. Among them, the top flange of steel section 2 is provided with several bolt holes 4 for connecting with the top longitudinal reinforcement positioning and locking steel beam; the middle flange of steel section 2 is provided with several bolt holes 5 for connecting with the diagonal brace; the bottom flange of steel section 2 is provided with several bolt holes 6 for connecting with the bottom longitudinal reinforcement positioning steel beam; several stiffening ribs 2 are welded to the bolt connection points inside the flange of steel section 2; connecting plate 1 is welded to the bottom of steel section 2, and connecting plate 1 is provided with several bolt holes 7 for connecting with the ground beam, the diameter and position of bolt holes 7 are the same as those of bolt holes 2 of the ground beam.

[0009] The diagonal brace includes a steel section three, a connecting plate two, and a connecting plate three. Both ends of the steel section three are designed to bevel. The connecting plate two and the connecting plate three are respectively provided with several bolt holes eight and several bolt holes nine for connecting with the column and the ground beam. The diameter and position of the bolt holes eight are the same as those of the bolt holes five of the column, and the diameter and position of the bolt holes nine are the same as those of the bolt holes one of the ground beam.

[0010] The bottom longitudinal reinforcement positioning steel beam includes an irregular upper flange plate, a web plate, a lower flange plate, several stiffening ribs, a connecting plate, and a stepped constricted longitudinal reinforcement positioning sleeve. A rectangular web is placed vertically between the shaped upper flange and the lower flange, with its upper and lower edges welded and fixed to the shaped upper flange and the lower flange, respectively. The shaped upper flange is a steel plate with multiple protruding positions on one side. It has several circular holes (1) corresponding to the spacing of the longitudinal bars in the pre-suspended reinforcing cage. A stepped-narrowed longitudinal bar positioning sleeve is welded between the upper and lower flanges at the locations of these circular holes. This sleeve is used for positioning and restraining the lower part of the longitudinal bars in the reinforcing cage. Additionally, several bolt holes (10) are located at the protruding positions of the shaped upper flange for connection to the longitudinal bearing channel steel. The lower flange has several bolt holes (11) at both ends for connection to the ground beam. The diameter of the bolt holes (11) is... The bolt holes are the same as those of the ground beam; several stiffening ribs are welded to the protruding part of the irregular upper flange plate 1 between the irregular upper flange plate, web plate and lower flange plate; the connecting plate 4 is welded to the side edges of the irregular upper flange plate 1 and the lower flange plate at both ends, and the connecting plate 4 is provided with several bolt holes 12 for connecting with the column. The diameter and position of the bolt holes 12 are the same as those of the bolt holes 6 of the column; in addition, the inner diameter of the stepped constricted longitudinal reinforcement positioning sleeve decreases from top to bottom, and is 48mm, 37mm and 29mm respectively, which can meet the positioning of longitudinal reinforcement in steel cages with diameters of 40mm, 32mm, 28mm and 25mm. The specific inner diameter can also be flexibly adjusted according to the preset diameter of the longitudinal reinforcement. The top longitudinal rib positioning and locking steel beam includes an irregular upper flange plate II, a web plate II, an irregular lower flange plate, several stiffening ribs IV, several stiffening ribs V, a connecting plate V, and a longitudinal rib positioning and locking sleeve. The second web plate is rectangular and is placed vertically between the second irregular upper flange plate and the second irregular lower flange plate, with its upper and lower edges welded and fixed to the second irregular upper flange plate and the second irregular lower flange plate, respectively. The smaller outward protrusion of the irregular upper flange plate 2 is provided with several bolt holes thirteen for connection with the short lifting beam; the larger outward protrusions of the irregular upper flange plate 2 and the irregular lower flange plate are respectively provided with elliptical elongated holes for installing and fixing inverted F-shaped steel bar combs; the two ends of the irregular upper flange plate 2 and the irregular lower flange plate are provided with round holes two for installing and fixing F-shaped steel bar combs; the irregular lower flange plate is provided with several round holes three according to the spacing of the longitudinal bars in the pre-lifted steel cage, and longitudinal bar positioning locking sleeves are welded between the upper and lower flange plates at the corresponding hole positions for positioning and restraining the upper part of the longitudinal bars in the steel cage. The diameter and position of the round holes three are the same as the round holes one of the bottom longitudinal bar positioning steel beam. In addition, the smaller outward protrusion of the irregular lower flange plate is provided with Several bolt holes fourteen are used to connect with the longitudinal bearing channel steel; several stiffening ribs four and five are respectively welded to the larger and smaller outward protrusions of the upper and lower flange plates to enhance the local bearing capacity and structural stability; connecting plate five is welded to the side edges of the two ends of the upper flange plate two and the lower flange plate, and several bolt holes fifteen are provided on this plate for connection with the column. The diameter and position of bolt holes fifteen are the same as those of bolt holes four on the column; the longitudinal rib positioning locking sleeve is composed of a short round steel pipe, a nut one and a hexagonal head bolt. Among them, a round hole three is opened in the middle of the short round steel pipe, the nut one is welded to the outer wall of the round hole three, and the hexagonal head bolt is arranged on the nut one. The inner diameter of the short round steel pipe is slightly larger than the diameter of the longitudinal rib. The outer contours of the upper flange plate and the lower flange plate are the same, except that the positions of the internal openings are different. Specifically, the outer contour is a rectangle with two trapezoidal shapes that bulge outward on one long side: a smaller one and a larger one.

[0011] The shaped reinforcing bar comb includes a longitudinal long reinforcing bar I, several transverse short reinforcing bars I, several transverse short reinforcing bars II, and two nuts II. The transverse short reinforcing bars are welded vertically to both sides of the longitudinal long reinforcing bar I according to the spacing of the transverse reinforcing bars in the reinforcing cage, and are used for positioning the transverse reinforcing bars in the reinforcing cage along the height direction. The slightly longer transverse short reinforcing bars are marked with positioning marks for positioning the transverse reinforcing bars in the reinforcing cage along the thickness direction. The top of the longitudinal long reinforcing bar I is provided with a threaded rod of a certain length, which can pass through the round hole II in the top longitudinal reinforcing bar positioning and locking steel beam and then be fixed by the two nuts II.

[0012] The inverted F-shaped steel bar comb includes a longitudinal long steel bar II, several transverse short steel bars III, and two nuts III. The transverse short steel bars III are welded to one side of the longitudinal long steel bar II at certain intervals for positioning the transverse bars in the steel cage along the vertical direction. The slightly longer transverse short steel bars are marked with positioning marks for positioning the transverse bars inside the steel cage along the thickness direction. The top of the longitudinal long steel bar II is provided with a threaded rod of a certain length, which can pass through the elliptical elongated hole in the top longitudinal bar positioning and locking steel beam and be fixed by the two nuts III.

[0013] The longitudinal load-bearing channel steel includes a channel steel and connecting plates six at both ends. The web of the channel steel is provided with several round holes four for positioning and fixing the transverse load-bearing tie rod. Each of the connecting plates six at both ends is provided with several bolt holes sixteen, which are used to connect with the top longitudinal reinforcement positioning and locking steel beam and the bottom longitudinal reinforcement positioning steel beam, respectively. The diameter and position of the bolt holes sixteen are the same as the bolt holes ten of the irregular upper flange plate one in the bottom longitudinal reinforcement positioning steel beam and the bolt holes fourteen of the irregular lower flange plate in the top longitudinal reinforcement positioning and locking steel beam.

[0014] The transverse load-bearing tie rod includes a long round steel pipe, a tie rod, and a nut. The inner diameter of the long round steel pipe is slightly larger than the diameter of the tie rod and the diameter of the four holes in the longitudinal load-bearing channel steel. It serves as both a cantilever for the reinforcing cage to transfer its weight to the load-bearing channel steel and a support to prevent deformation of the load-bearing channel steel on both sides during the tightening of the bolts. The tie rod is installed inside the long cylindrical steel tube and fixed at both ends with nuts.

[0015] The short lifting beam includes a steel section four and several stiffening ribs six; wherein, the upper flange of the steel section four is provided with several bolt holes seventeen for connection with the lifting lugs; the lower flange of the steel section four is provided with several bolt holes eighteen for connection with the top longitudinal reinforcement positioning and locking steel beam, and the diameter and position of the bolt holes eighteen are the same as the bolt holes thirteen of the irregular upper flange plate two in the top longitudinal reinforcement positioning and locking steel beam; the stiffening ribs six are arranged at the connection between the short lifting beam and the top longitudinal reinforcement positioning and locking steel beam.

[0016] The lifting lug includes a lug plate and a connecting plate 7, with the lug plate disposed on the upper surface of the connecting plate 7; The ear plate has a centrally located lifting hole; the connecting plate 7 has several bolt holes 20 for connecting to the short lifting beam, and the diameter and position of the bolt holes 20 are the same as those of the bolt holes 17 on the upper flange of the short lifting beam.

[0017] The construction method for modular steel cage external prefabricated fixtures for nuclear-related thick wall structures is as follows: (1) Assembly of the main body of the external prefabricated tooling; two ground beams are arranged in the preset positions on the flat ground; the bottom longitudinal reinforcement positioning steel beam is connected to the ground beam with several bolts; the column is connected to the ground beam and the bottom longitudinal reinforcement positioning steel beam with several bolts; the diagonal brace is connected to the ground beam and the column with several bolts; the two top longitudinal reinforcement positioning and locking steel beams, the short hanging beam and the lifting lug are connected with several bolts and then lifted as a whole and connected to the top of the column; (2) Binding of modular steel cage and assembly of external prefabricated fixtures; insert the longitudinal bars of the steel cage into the longitudinal bar positioning and locking sleeve of the top longitudinal bar positioning and locking steel beam in sequence, and then insert the stepped constricted longitudinal bar positioning sleeve of the bottom longitudinal bar positioning steel beam. Lock the longitudinal bars by tightening the hexagonal head bolts in the longitudinal bar positioning and locking sleeve; connect and fix the F-shaped steel bar comb and the inverted F-shaped steel bar comb in sequence on the top longitudinal bar positioning and locking steel beam; use several bolts to connect the top and bottom of the longitudinal bearing channel steel to the top longitudinal bar positioning and locking steel beam and the bottom longitudinal bar positioning steel beam respectively, and install the transverse bearing tie rod between the front and rear longitudinal bearing channel steels; then insert the transverse bars and tie rods in sequence according to the predetermined positions and bind and fix them. (3) Overall hoisting of modular steel cage; First, remove the connecting bolts between the top longitudinal reinforcement positioning and locking steel beam and the column, and between the longitudinal bearing channel steel and the bottom longitudinal reinforcement positioning steel beam; Use a hoisting rope to connect the lifting lug to the lifting point below the long lifting beam, and then use a hoisting rope to connect the lifting point on the long lifting beam to the hook; Hoist the external prefabricated tooling and modular steel cage together upwards and move them smoothly to the position where the steel cage is to be connected; Place extrusion sleeves between the ends of the horizontal reinforcement on the side of the steel cage, the ends of the longitudinal reinforcement at the bottom, and the steel bars to be connected, and use the steel bar sleeve extrusion connection technology in the steel bar mechanical connection method to firmly connect the two; (4) Retrieval of external prefabricated fixtures; After the steel cage is connected and fixed to the predetermined position, remove the transverse load-bearing tie rod; Rotate the fixing nuts 2 and 3 at the ends of the shaped steel bar comb and the inverted F-shaped steel bar comb to move them down and separate them from the contact with the transverse reinforcement, rotate the shaped steel bar comb 90 degrees, move the inverted F-shaped steel bar comb to the outermost edge of the elliptical long hole and rotate it 90 degrees; Loosen the hexagonal head bolts in the longitudinal reinforcement positioning and locking sleeve of the top longitudinal reinforcement positioning and locking steel beam; Lift and retrieve the external prefabricated fixtures, and reconnect and fix them to the column and the bottom longitudinal reinforcement positioning steel beam to carry out the binding and hoisting work of the next steel cage, repeat the above steps until the steel reinforcement project is completely hoisted.

[0018] The beneficial effects of this invention are: 1) This invention employs external prefabricated fixtures to achieve ground binding and aerial hoisting of modular rebar cages. Specifically, the longitudinal bars in the rebar cage are precisely positioned and locked according to preset spacing by the stepped-narrow-mouth longitudinal bar positioning sleeves in the bottom longitudinal bar positioning steel beam and the longitudinal bar positioning and locking sleeves in the top longitudinal bar positioning and locking steel beam. This prevents vertical bar misalignment during hoisting and installation, ensuring precise alignment of the rebar cage. The transverse bars in the rebar cage are precisely positioned and fixed according to preset spacing by the shaped rebar combs, inverted F-shaped rebar combs, and transverse load-bearing tie rods, facilitating precise alignment and installation of the transverse bars and enhancing the construction quality of the structure. Because this external prefabricated fixture has high structural rigidity, it effectively constrains the rebar cage throughout the hoisting process, significantly suppressing deformation and rebar misalignment caused by the cage's own weight or external forces.

[0019] 2) This invention employs a complete set of rebar cage construction technology, with assembly line construction on site. The rebar cage is tied to the ground outside the core construction area, and then hoisted as a whole using external prefabricated tools. After being hoisted to the predetermined position, the rebar cage is securely connected to the predetermined position using rebar sleeve extrusion connection technology, which greatly simplifies the on-site installation process. Through parallel operation of multiple tools, the tying and hoisting of modular rebar cages can be carried out simultaneously, effectively shortening the construction cycle.

[0020] 3) This invention employs external prefabricated fixtures to complete the binding and overall hoisting of modular rebar cages, achieving standardization and modularization of the rebar processing, positioning, and installation process. It enables precise control of rebar spacing, protective layer thickness, node positions, and overall dimensional deviations, improving the quality and batch consistency of the rebar cage. It is particularly suitable for construction scenarios involving nuclear facilities and other nuclear-related projects, characterized by dense rebar, large structural dimensions, and high requirements for construction precision and quality traceability. It reduces the need for individual rebar installation and cross-operations on construction sites, minimizing errors, omissions, and positioning deviations caused by limited work space, differences in personnel operation, and chaotic material stacking. This ensures that the rebar cage installation position and structural stress performance meet the design and acceptance requirements of nuclear-related projects, thereby improving the construction quality, structural safety, and long-term service reliability of nuclear-related structures. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a modular steel cage external prefabricated tooling for a nuclear-related thick wall structure according to the present invention.

[0022] Figure 2 This is a schematic diagram of the ground beam structure.

[0023] Figure 3 This is a schematic diagram of the column structure.

[0024] Figure 4 This is a schematic diagram of the diagonal bracing structure.

[0025] Figure 5 This is a schematic diagram of the bottom longitudinal reinforcement positioning steel beam structure.

[0026] Figure 6 This is a schematic diagram of the top longitudinal reinforcement positioning and locking type steel beam structure.

[0027] Figure 7 This is a schematic diagram of the stepped constricted longitudinal reinforcement positioning sleeve structure.

[0028] Figure 8 This is a schematic diagram of the longitudinal reinforcement positioning and locking sleeve.

[0029] Figure 9 This is a schematic diagram of the Feng-shaped steel bar comb structure.

[0030] Figure 10 This is a schematic diagram of an inverted F-shaped steel bar comb structure.

[0031] Figure 11 This is a schematic diagram of the longitudinal load-bearing channel steel structure.

[0032] Figure 12 This is a schematic diagram of the lateral load-bearing tie rod structure.

[0033] Figure 13 This is a schematic diagram of a short suspension beam structure.

[0034] Figure 14 This is a schematic diagram of the lifting lug structure.

[0035] Figure 15 This is a schematic diagram of the ground beam positioning and installation.

[0036] Figure 16 This is a schematic diagram of the installation of the bottom longitudinal reinforcement positioning steel beam.

[0037] Figure 17 This is a schematic diagram of the column installation.

[0038] Figure 18 This is a diagram showing the installation of the diagonal brace.

[0039] Figure 19 This is a schematic diagram of the installation of the top longitudinal reinforcement positioning and locking steel beam, short lifting beam, and lifting lugs.

[0040] Figure 20 This is a schematic diagram of the installation of longitudinal reinforcement bars in a modular steel cage.

[0041] Figure 21 This is a schematic diagram of the installation of the Feng-shaped steel bar comb, the inverted F-shaped steel bar comb, the longitudinal bearing channel steel, and the transverse bearing tie rod.

[0042] Figure 22 This is a schematic diagram of the positioning and binding of horizontal bars and tie bars in a modular steel cage.

[0043] Figure 23 This is a schematic diagram showing the removal of bolts between the top longitudinal reinforcement positioning and locking steel beam and the column, and between the longitudinal bearing channel steel and the bottom longitudinal reinforcement positioning steel beam before lifting.

[0044] Figure 24 This is a schematic diagram showing the arrangement of lifting ropes and long lifting beams on the modular steel cage before lifting.

[0045] Figure 25 This is a schematic diagram of the steel cage suspended in the air after being lifted.

[0046] Figure 26 This is a schematic diagram showing the connection of a modular steel cage using steel extrusion sleeves after it has been hoisted to the designated position.

[0047] Figure 27This is a schematic diagram of the disassembly process of external prefabricated tooling.

[0048] Figure 28 This is a schematic diagram of the lifting and recovery of external prefabricated tooling. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings.

[0050] like Figure 1 As shown, the present invention provides a modular externally mounted prefabricated tooling for nuclear-related thick wall structures, comprising: 1. Ground beam for connecting upper fixtures; 2. Column for supporting upper fixtures and loads; 3. Diagonal brace for providing lateral support for fixtures; 4. Bottom longitudinal reinforcement positioning steel beam for auxiliary positioning of vertical longitudinal reinforcement in the reinforcing cage; 5. Top longitudinal reinforcement positioning and locking steel beam for auxiliary positioning and fixing of vertical longitudinal reinforcement in the reinforcing cage; 6. F-shaped reinforcing bar comb for auxiliary positioning of both ends of transverse reinforcement in the reinforcing cage and auxiliary load bearing during hoisting; 7. Inverted F-shaped reinforcing bar comb for auxiliary positioning of the middle of transverse reinforcement in the reinforcing cage and auxiliary load bearing during hoisting; 8. Longitudinal load-bearing channel steel for mainly bearing the weight of the reinforcing cage during hoisting; 9. Transverse load-bearing tie rod for auxiliary transmission of the weight of the reinforcing cage during hoisting; 10. Short lifting beam for overall hoisting; 11. Lifting lug for fixing lifting ropes. All parts are connected by bolts.

[0051] like Figure 2 As shown, the ground beam 1 is welded from a steel section 1.1 and several stiffening ribs 1.2. The upper flange of the steel section 1.1 has several bolt holes 1.1.1 at both ends for connection to the diagonal brace 3, and several bolt holes 1.1.2 and 1.1.3 in the middle of the upper flange for connection to the column 2 and the bottom longitudinal reinforcement positioning steel beam 4, respectively. The stiffening ribs 1.2 are arranged between the upper and lower flanges of the steel section 1.1, specifically at the connections between the ground beam 1 and the column 2, and between the ground beam 1 and the diagonal brace 3.

[0052] like Figure 3As shown, column 2 is welded from steel section 2.1, several stiffening ribs 2.2, and connecting plate 2.3. Specifically, the top flange of steel section 2.1 has several bolt holes 2.1.1 for connecting to the top longitudinal reinforcement positioning and locking steel beam 5; the middle flange of steel section 2.1 has several bolt holes 2.1.2 for connecting to the diagonal brace 3; the bottom flange of steel section 2.1 has several bolt holes 2.1.3 for connecting to the bottom longitudinal reinforcement positioning steel beam 4; several stiffening ribs 2.2 are welded to the bolt connections inside the flange of steel section 2.1; connecting plate 2.3 is welded to the bottom of steel section 2.1, and has several bolt holes 2.3.1 for connecting to the ground beam 1. The diameter and position of bolt holes 2.3.1 are the same as those of bolt holes 1.1.2 on the ground beam 1.

[0053] like Figure 4 As shown, the diagonal brace 3 is welded from section steel 3.1, connecting plate 2 3.2, and connecting plate 3.3. Both ends of section steel 3.1 are designed with beveled cuts. Connecting plate 2 3.2 and connecting plate 3.3 are respectively provided with several bolt holes 8 3.2.1 and several bolt holes 9 3.3.1 for connection to column 2 and ground beam 1, respectively. The diameter and position of bolt hole 8 3.2.1 are the same as bolt hole 5 2.1.2 of column 2, and the diameter and position of bolt hole 9 3.3.1 are the same as bolt hole 1 1.1.1 of ground beam 1.

[0054] like Figure 5 As shown, the bottom longitudinal reinforcement positioning steel beam 4 is welded from an irregular upper flange plate 4.1, a web plate 4.2, a lower flange plate 4.3, several stiffening ribs 4.4, a connecting plate 4.5, and a stepped constricted longitudinal reinforcement positioning sleeve 4.6. The irregular upper flange plate 4.1 has several round holes 4.1.1 according to the spacing of the longitudinal reinforcement 12 in the pre-suspended steel cage. A stepped constricted longitudinal reinforcement positioning sleeve 4.6 is welded between the upper and lower flange plates at these hole locations for positioning and restraining the lower part of the longitudinal reinforcement 12 in the steel cage. Additionally, several bolt holes 4.1.2 are provided on the protruding part of the irregular upper flange plate 4.1 for connection with the longitudinal bearing channel steel 8. Several bolt holes 4.3.1 are provided at both ends of the lower flange plate 4.3 for connection with the ground beam 1. The diameter and position of the holes in 4.3.1 are the same as those of the bolt holes 1.1.3 of the ground beam 1; several stiffening ribs 4.4 are welded to the protruding part of the upper flange 4.1 between the upper flange 4.1, the web 4.2 and the lower flange 4.3; the connecting plate 4.5 is welded to the side edges of the upper flange 4.1 and the lower flange 4.3 at both ends, and several bolt holes 4.5.1 are provided on the plate for connection with the column 2. The diameter and position of the bolt holes 4.5.1 are the same as those of the bolt holes 2.1.3 of the column 2.

[0055] like Figure 6As shown, the top longitudinal rib positioning and locking steel beam 5 is welded together from the irregular upper flange plate 2 5.1, the web plate 2 5.2, the irregular lower flange plate 5.3, several stiffening ribs 4 5.4, several stiffening ribs 5.5, the connecting plate 5.6, and the longitudinal rib positioning and locking sleeve 5.7. The smaller outward protrusion of the irregular upper flange plate 2 5.1 is provided with several bolt holes 13 5.1.1 for connection with the short lifting beam 10; the larger outward protrusions of the irregular upper and lower flange plates are respectively provided with elliptical elongated holes 5.1.2 for installation and fixing of inverted F-shaped steel bar combs 7; the two ends of the irregular upper and lower flange plates are provided with round holes 2 5.1.3 for installation and fixing of F-shaped steel bar combs 6; the irregular lower flange plate 5.3 is provided with several round holes 3 5.3.1 according to the spacing of the longitudinal bars 12 in the pre-lifted steel cage, and longitudinal bar positioning locking sleeves 5.7 are welded between the upper and lower flange plates at the corresponding hole positions for positioning and restraint of the upper part of the longitudinal bars 12 in the steel cage. The diameter, position and bottom of the round holes 3 5.3.1 are specified. The circular holes 4.1.1 of the longitudinal reinforcement positioning steel beam 4 are the same. In addition, the smaller outward protrusion of the irregular lower flange plate 5.3 is provided with several bolt holes 14.3.2 for connection with the longitudinal bearing channel steel 8. Several stiffening ribs 4.4 and 5.5 are respectively welded to the larger and smaller outward protrusions of the irregular upper and lower flange plates to enhance local bearing capacity and structural stability. The connecting plate 5.6 is welded to the side edges of the irregular upper flange plate 2.1 and irregular lower flange plate 5.3 at both ends, and several bolt holes 15.6.1 are provided on this plate for connection with the column 2. The diameter and position of the bolt holes 15.6.1 are the same as those of the bolt holes 4.1.1 of the column 2.

[0056] like Figure 7 As shown, the inner diameter of the stepped constricted longitudinal reinforcement positioning sleeve 4.6 decreases from top to bottom, to 48mm, 37mm and 29mm respectively, which can meet the positioning of longitudinal reinforcement 12 in steel cages with diameters of 40mm, 32mm, 28mm and 25mm. The specific inner diameter can also be flexibly adjusted according to the preset diameter of the longitudinal reinforcement.

[0057] like Figure 8 As shown, the longitudinal rib positioning and locking sleeve 5.7 is composed of a short round steel tube 5.7.1, a nut 5.7.2, and a hexagonal head bolt 5.7.3. The short round steel tube 5.7.1 has a circular hole 5.7.1.1 in the middle. The nut 5.7.2 is welded to the outer wall of the circular hole. The hexagonal head bolt 5.7.3 is arranged on the nut 5.7.2. The inner diameter of the short round steel tube 5.7.1 is slightly larger than the diameter of the longitudinal rib 12.

[0058] like Figure 9As shown, the shaped steel reinforcement comb 6 consists of a longitudinal long steel bar 6.1, several transverse short steel bars 6.2, several transverse short steel bars 6.3, and two nuts 6.4. The transverse short steel bars are welded vertically to both sides of the longitudinal long steel bar 6.1 according to the spacing of the transverse reinforcement bars 13 in the steel cage, and are used for positioning the transverse reinforcement bars 13 along the height direction in the steel cage. The slightly longer transverse short steel bars are marked with positioning marks for positioning the internal transverse reinforcement bars 13 along the thickness direction in the steel cage. A threaded rod of a certain length is provided at the top of the longitudinal long steel bar 6.1, which can pass through the circular holes 5.1.3 in the irregular upper and lower flange plates of the top longitudinal reinforcement positioning and locking steel beam 5 and be fixed by the two nuts 6.4.

[0059] like Figure 10 As shown, the inverted F-shaped reinforcing bar comb 7 consists of a longitudinal long reinforcing bar 7.1, several transverse short reinforcing bars 7.2, and two nuts 7.3. The transverse short reinforcing bars 7.2 are welded to one side of the longitudinal long reinforcing bar at certain intervals for positioning the transverse reinforcement in the vertical direction within the reinforcing cage. The slightly longer transverse short reinforcing bars are marked with positioning indicators for positioning the internal transverse reinforcement 13 along the thickness direction within the reinforcing cage. The top of the longitudinal long reinforcing bar 7.1 is equipped with a threaded rod of a certain length, which can pass through the elliptical holes 5.1.2 in the irregular upper and lower flange plates of the top longitudinal reinforcement positioning and locking steel beam 5 and be fixed by the two nuts 7.3.

[0060] like Figure 11 As shown, the longitudinal bearing channel steel 8 is welded from channel steel 8.1 and connecting plates 8.2 at both ends. The web of channel steel 8.1 has several round holes 8.1.1 for positioning and fixing the transverse bearing tie rod 9. The connecting plates 8.2 at both ends each have several bolt holes 8.2.1 for connecting to the top longitudinal reinforcement positioning and locking steel beam 5 and the bottom longitudinal reinforcement positioning steel beam 4, respectively. The diameter and position of the bolt holes 8.2.1 are the same as those of the bolt holes 4.1.2 on the irregular upper flange plate 4.1 in the bottom longitudinal reinforcement positioning steel beam 4 and the bolt holes 5.3.2 on the irregular lower flange plate 5.3 in the top longitudinal reinforcement positioning and locking steel beam 5.

[0061] like Figure 12 As shown, the transverse load-bearing tie rod 9 consists of a long cylindrical steel pipe 9.1, a tie rod 9.2, and a nut 9.3. The inner diameter of the long cylindrical steel pipe 9.1 is slightly larger than the diameter of the tie rod 9.2 and the diameter of the circular hole 8.1.1 in the longitudinal load-bearing channel steel 8. It serves both as a support rod for the reinforcing cage, transferring its weight to the load-bearing channel steel 8, and as a strut to prevent deformation of the load-bearing channel steel 8 on both sides during bolt tightening.

[0062] like Figure 13As shown, the short lifting beam 10 is welded from section steel 10.1 and several stiffening ribs 10.2. Section steel 10.1 has several bolt holes 1710.1.1 on its upper flange for connection to the lifting lug 11; section steel 10.1 has several bolt holes 1810.1.1 on its lower flange for connection to the top longitudinal reinforcement positioning and locking steel beam 5. The diameter and position of bolt holes 1810.1.1 are the same as bolt holes 135.1.1 on the irregular upper flange plate 25.1 of the top longitudinal reinforcement positioning and locking steel beam 5. The stiffening ribs 10.2 are arranged at the connection between the short lifting beam 10 and the top longitudinal reinforcement positioning and locking steel beam 5.

[0063] like Figure 14 As shown, the lifting lug 11 is welded from a lug plate 11.1 and a connecting plate 11.2. The lug plate 11.1 has a centrally located lifting hole 11.1.1; the connecting plate 11.2 has several bolt holes 11.2.1 for connection to the short lifting beam 10, and the diameter and position of the bolt holes 11.2.1 are the same as those of the bolt holes 10.1.1 on the upper flange of the short lifting beam 10.

[0064] The specific construction method of the modular steel cage external prefabricated fixture for nuclear-related thick wall structures of the present invention includes the following steps: 1) Assembly of the main body of the external prefabricated tooling. The specific assembly process is as follows: Figure 15 As shown, two ground beams 1 are arranged at predetermined positions on a flat surface; as... Figure 16 As shown, several bolts 100 are used to connect the bottom longitudinal reinforcement positioning steel beam 4 to the ground beam 1; as Figure 17 As shown, several bolts 100 are used to connect the column 2 to the ground beam 1 and the bottom longitudinal reinforcement positioning steel beam 4; as Figure 18 As shown, several bolts 100 are used to connect the diagonal brace 3 to the ground beam 1 and the column 2; as Figure 19 As shown, the two top longitudinal reinforcement positioning and locking steel beams 5, short lifting beams 10 and lifting lugs 11 are connected by several bolts 100 and then lifted as a whole to be connected to the top of the column 2.

[0065] 2) Binding of modular steel reinforcement cages and assembly of external prefabricated fixtures and accessories. The specific assembly process is as follows: Figure 20 As shown, the longitudinal bars 12 of the reinforcing cage are first inserted into the longitudinal bar positioning and locking sleeves 5.7 of the top longitudinal bar positioning and locking steel beam 5, and then inserted into the stepped constricted longitudinal bar positioning sleeves 4.6 of the bottom longitudinal bar positioning steel beam 4. The longitudinal bars 12 are then locked and fixed by tightening the hexagonal head bolts 5.7.3 in the longitudinal bar positioning and locking sleeves 5.7. Figure 21As shown, the top longitudinal reinforcement positioning and locking steel beam 5 is sequentially connected and fixed with the F-shaped steel bar comb 6 and the inverted F-shaped steel bar comb 7. Several bolts 100 are used to connect the top and bottom of the longitudinal bearing channel steel 8 to the top longitudinal reinforcement positioning and locking steel beam 5 and the bottom longitudinal reinforcement positioning steel beam 4, respectively. A transverse bearing tie rod 9 is installed between the front and rear longitudinal bearing channel steels 8. Figure 22 As shown, insert the horizontal reinforcing bars 13 and the tie bars 14 in sequence at the predetermined positions and tie them in place.

[0066] 3) Overall hoisting of the modular steel reinforcement cage. The specific hoisting process is as follows: Figure 23 As shown, first remove the connecting bolts 100 between the top longitudinal reinforcement positioning and locking steel beam 5 and the column 2, and between the longitudinal bearing channel steel 8 and the bottom longitudinal reinforcement positioning steel beam 4; as Figure 24 As shown, the lifting lug 11 is connected to the lifting point below the long lifting beam 16 using lifting rope 15, and then the lifting point on the long lifting beam 16 is connected to the lifting hook using lifting rope 15; as shown Figure 25 As shown, the external prefabricated tooling and modular steel cage are lifted upwards as a whole and moved smoothly to the position where the steel cage is to be connected; as Figure 26 As shown, extrusion sleeves 14 are arranged between the ends of the horizontal bars 13 on the side of the steel cage, the ends of the longitudinal bars 12 at the bottom, and the steel bars to be connected, and the steel bar sleeve extrusion connection technology in the steel bar mechanical connection method is used to firmly connect the two.

[0067] 4) Retrieval of external prefabricated tooling. The specific retrieval process is as follows: Figure 27 As shown, after the reinforcing cage is connected and fixed to the predetermined position, remove the transverse load-bearing tie rod 9, rotate the fixing nuts 6.4 and 7.3 at the ends of the shaped reinforcing bar comb 6 and the inverted F-shaped reinforcing bar comb 7 to move them down and disengage from the transverse reinforcement 13, rotate the shaped reinforcing bar comb 6 by 90 degrees, move the inverted F-shaped reinforcing bar comb 7 outward to the outermost edge of the elliptical elongated hole 5.1.2 and rotate it by 90 degrees, loosen the hexagonal head bolt 5.7.3 in the longitudinal reinforcement positioning and locking sleeve 5.7 in the top longitudinal reinforcement positioning and locking steel beam 5; as Figure 28 As shown, the external prefabricated fixtures are lifted and retrieved, and then reconnected and fixed to the column 2 and the bottom longitudinal reinforcement positioning steel beam 4 to carry out the binding and hoisting of the next steel cage. The above steps are repeated until all steel reinforcement works are hoisted.

[0068] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A modular, externally mounted prefabricated steel cage fixture for nuclear-related thick wall structures, characterized in that: It includes a ground beam (1) and two parallel and symmetrically arranged bottom longitudinal reinforcement positioning steel beams (4); the ground beam (1) is vertically arranged at both ends below the bottom longitudinal reinforcement positioning steel beams (4), and two columns (2) are arranged above the middle part of the ground beam (1). The outside of the columns (2) is fixed by diagonal bracing (3). One end of the diagonal bracing (3) is installed in the middle of the column (2), and the other end is set on the surface of the ground beam (1); Two top longitudinal reinforcement positioning and locking steel beams (5) are set symmetrically between the tops of the columns (2) at both ends; A multi-shaped steel bar comb (6), an inverted F-shaped steel bar comb (7), and a longitudinal bearing channel steel (8) are set between two parallel top longitudinal reinforcement positioning and locking steel beams (5) and two parallel bottom longitudinal reinforcement positioning steel beams (4); The shaped steel bar comb (6) includes two sets, and each set of shaped steel bar combs (6) is symmetrically arranged on both sides of the top longitudinal reinforcement positioning and locking steel beam (5) and the bottom longitudinal reinforcement positioning steel beam (4); Multiple sets of inverted F-shaped steel bar combs (7) and longitudinal bearing channel steel (8) are set; each set of inverted F-shaped steel bar combs (7) and longitudinal bearing channel steel (8) are symmetrically set on both sides of the top longitudinal reinforcement positioning and locking steel beam (5) and the bottom longitudinal reinforcement positioning steel beam (4); The transverse load-bearing tie rods (9) are evenly spaced between the longitudinal load-bearing channel steels (8) on the front and rear sides; the short lifting beam (10) is set on the top longitudinal reinforcement positioning and locking steel beam (5); the lifting lug (11) is set above the short lifting beam (10).

2. The modular external steel cage prefabrication fixture for a nuclear-related thick wall structure according to claim 1, characterized in that, The ground beam (1) includes a steel section (1.1) and several stiffening ribs (1.2); Among them, the upper flange of the steel section (1.1) is provided with several bolt holes (1.1.1) at both ends for connecting with the diagonal brace (3), and the upper flange of the steel section (1.1) is provided with several bolt holes (1.1.2) and several bolt holes (1.1.3) in the middle, which are respectively used to connect with the column (2) and the bottom longitudinal reinforcement positioning steel beam (4); several stiffening ribs (1.2) are arranged between the upper and lower flanges of the steel section (1.1) and located at the connection between the ground beam (1) and the column (2) and the ground beam (1) and the diagonal brace (3).

3. The modular external steel cage prefabrication fixture for a nuclear-related thick wall structure according to claim 1, characterized in that, The column (2) includes a second type of steel section (2.1), several second stiffening ribs (2.2), and a first connecting plate (2.3); Among them, the top flange of steel section 2 (2.1) is provided with several bolt holes 4 (2.1.1) for connecting with the top longitudinal reinforcement positioning and locking steel beam (5); the middle flange of steel section 2 (2.1) is provided with several bolt holes 5 (2.1.2) for connecting with the diagonal brace (3); the bottom flange of steel section 2 (2.1) is provided with several bolt holes 6 (2.1.3) for connecting with the bottom longitudinal reinforcement positioning steel beam (4); several stiffening ribs 2 (2.2) are welded to the bolt connection inside the flange of steel section 2 (2.1); the connecting plate 1 (2.3) is welded to the bottom of steel section 2 (2.1), and the connecting plate 1 (2.3) is provided with several bolt holes 7 (2.3.1) for connecting with the ground beam (1), the hole diameter and hole position of bolt holes 7 (2.3.1) are the same as those of bolt holes 2 (1.1.2) of the ground beam (1).

4. The modular external steel cage prefabrication fixture for a nuclear-related thick wall structure according to claim 1, characterized in that, The diagonal brace (3) includes a steel section three (3.1), a connecting plate two (3.2) and a connecting plate three (3.3). Both ends of the steel section three (3.1) are designed to be beveled. The connecting plate two (3.2) and the connecting plate three (3.3) are respectively provided with several bolt holes eight (3.2.1) and several bolt holes nine (3.3.1) for connecting with the column (2) and the ground beam (1). The diameter and position of the bolt hole eight (3.2.1) are the same as those of the bolt hole five (2.1.2) of the column (2), and the diameter and position of the bolt hole nine (3.3.1) are the same as those of the bolt hole one (1.1.1) of the ground beam (1).

5. The modular external steel cage prefabrication fixture for a nuclear-related thick wall structure according to claim 1, characterized in that, The bottom longitudinal reinforcement positioning steel beam (4) includes an irregular upper flange plate (4.1), a web plate (4.2), a lower flange plate (4.3), several stiffening ribs (4.4), a connecting plate (4.5), and a stepped constricted longitudinal reinforcement positioning sleeve (4.6). The first web plate (4.2) is rectangular and is placed vertically between the first irregular upper flange plate (4.1) and the second lower flange plate (4.3), and its upper and lower edges are welded and fixed to the first irregular upper flange plate (4.1) and the second lower flange plate (4.3) respectively. Among them, the irregular upper flange plate 1 (4.1) is an irregular steel plate with multiple outward protrusions on one side edge. It has several round holes 1 (4.1.1) on it according to the spacing of the longitudinal bars (12) in the pre-suspended steel cage. A stepped constricted longitudinal bar positioning sleeve (4.6) is welded between the upper and lower flange plates at the position of the round hole 1 (4.1.1). It is used for positioning and restraining the lower part of the longitudinal bars (12) in the steel cage. In addition, several bolt holes 10 (4.1.2) are provided at the outward protrusions of the irregular upper flange plate 1 (4.1) for connecting with the longitudinal bearing channel steel (8). The lower flange plate (4.3) has several bolt holes 11 (4.3.1) at both ends for connecting with the ground beam (1). The holes of bolt holes 11 (4.3.1) are... The diameter and hole position are the same as the bolt hole three (1.1.3) of the ground beam (1); several stiffening ribs three (4.4) are welded to the protruding part of the irregular upper flange plate one (4.1) between the irregular upper flange plate (4.1), the web plate (4.2) and the lower flange plate (4.3); the connecting plate four (4.5) is welded to the side edge of the irregular upper flange plate one (4.1) and the lower flange plate (4.3) at both ends, and several bolt holes twelve (4.5.1) for connecting with the column (2) are provided on the connecting plate four (4.5). The hole diameter and hole position of the bolt hole twelve (4.5.1) are the same as the bolt hole six (2.1.3) of the column (2); in addition, the inner diameter of the stepped narrowing longitudinal reinforcement positioning sleeve (4.6) is gradually reduced from top to bottom.

6. The modular external steel cage prefabrication fixture for a nuclear-related thick wall structure according to claim 1, characterized in that, The top longitudinal reinforcement positioning and locking steel beam (5) includes an irregular upper flange plate two (5.1), a web plate two (5.2), an irregular lower flange plate (5.3), several stiffening ribs four (5.4), several stiffening ribs five (5.5), a connecting plate five (5.6), and a longitudinal reinforcement positioning and locking sleeve (5.7). The second web plate (5.2) is rectangular and is placed vertically between the second irregular upper flange plate (5.1) and the second irregular lower flange plate (5.3), and its upper and lower edges are welded and fixed to the second irregular upper flange plate (5.1) and the second irregular lower flange plate (5.3) respectively; The smaller outwardly protruding part of the irregular upper flange plate 2 (5.1) is provided with several bolt holes thirteen ( 5.1.1), used to connect with the short hanging beam (10); the larger outward protrusions of the irregular upper flange plate (5.1) and the irregular lower flange plate (5.3) are respectively provided with elliptical elongated holes ( 5.1.2), used for installing and fixing the inverted F-shaped steel bar comb (7); the two ends of the irregular upper flange plate (5.1) and the irregular lower flange plate (5.3) are provided with round holes (5.1.3) for installing and fixing the F-shaped steel bar comb (6); the irregular lower flange plate (5.3) is provided with several round holes (5.3.1) according to the spacing of the longitudinal bars (12) in the pre-suspended steel cage, and longitudinal bar positioning locking sleeves (5.7) are welded between the upper and lower flange plates at the corresponding hole positions for the longitudinal bars (12) in the steel cage. The positioning and constraint of the part, the diameter and position of the circular hole three (5.3.1) are the same as the circular hole one (4.1.1) of the bottom longitudinal reinforcement positioning steel beam (4). In addition, the smaller outward protrusion of the irregular lower flange plate (5.3) is provided with several bolt holes fourteen (5.3.2) for connecting with the longitudinal bearing channel steel (8); several stiffening ribs four (5.4) and stiffening ribs five (5.5) are respectively welded to the larger and smaller outward protrusions of the irregular upper and lower flange plates to enhance the local bearing capacity and structural stability. Connecting plate five (5.6) is welded to the side edges of the two ends of the irregular upper flange plate two (5.1) and the irregular lower flange plate (5.3), and several bolt holes fifteen (5.6.1) are provided on this plate for connection with the column (2). The diameter and position of bolt holes fifteen (5.6.1) are the same as those of bolt holes four (2.1.1) on the column (2); the longitudinal rib positioning locking sleeve (5.7) is made of short round steel pipe (5.7.1). It consists of a nut (5.7.2) and a hexagonal head bolt (5.7.3), wherein a circular hole (5.7.1.1) is opened in the middle of the short round steel pipe (5.7.1), the nut (5.7.2) is welded to the outer wall of the circular hole (5.7.1.1), and the hexagonal head bolt (5.7.3) is arranged on the nut (5.7.2). The inner diameter of the short round steel pipe (5.7.1) is slightly larger than the diameter of the longitudinal rib (12); The outer contours of the irregular upper flange plate 2 (5.1) and the irregular lower flange plate (5.3) are the same. Specifically, the outer contours are rectangular and have two trapezoidal shapes with smaller and larger convexities on one long side.

7. The modular external steel cage prefabrication fixture for a nuclear-related thick wall structure according to claim 1, characterized in that, The shaped steel bar comb (6) includes a longitudinal long steel bar I (6.1), several transverse short steel bars I (6.2), several transverse short steel bars II (6.3), and two nuts II (6.4). The transverse short steel bars are vertically welded to both sides of the longitudinal long steel bar I (6.1) according to the spacing of the transverse bars (13) in the steel cage, and are used for positioning the transverse bars (13) in the steel cage along the height direction. The slightly longer transverse short steel bars are marked with positioning marks and are used for positioning the transverse bars (13) inside the steel cage along the thickness direction. The top of the longitudinal long steel bar I (6.1) is provided with a certain length of threaded rod, which can pass through the round hole II (5.1.3) in the top longitudinal bar positioning locking steel beam (5) and be fixed by two nuts II (6.4). The inverted F-shaped steel bar comb (7) includes a longitudinal long steel bar II (7.1), several transverse short steel bars III (7.2) and two nuts III (7.3). The transverse short steel bars III (7.2) are welded to one side of the longitudinal long steel bar II (7.1) at certain intervals for positioning the transverse bars in the steel cage along the vertical direction. The slightly longer transverse short steel bars are marked with positioning marks for positioning the internal transverse bars (13) in the steel cage along the thickness direction. The top of the longitudinal long steel bar II (7.1) is provided with a threaded rod of a certain length, which can pass through the elliptical long hole (5.1.2) in the top longitudinal bar positioning and locking steel beam (5) and be fixed by the two nuts III (7.3).

8. A modular steel cage external prefabricated fixture for a nuclear-related thick wall structure according to claim 1, characterized in that the longitudinal bearing channel steel (8) includes a channel steel (8.1) and connecting plates six (8.2) at both ends, wherein the web of the channel steel (8.1) is provided with a plurality of round holes four (8.1.1) for positioning and fixing the transverse bearing tie rod (9); the connecting plates six (8.2) at both ends are provided with a plurality of bolt holes sixteen (8.2.1) for connecting with the top longitudinal reinforcement positioning and locking steel beam (5) and the bottom longitudinal reinforcement positioning steel beam (4) respectively, and the hole diameter and hole position of the bolt holes sixteen (8.2.1) are the same as the bolt holes ten (4.1.2) of the irregular upper flange plate one (4.1) in the bottom longitudinal reinforcement positioning steel beam (4) and the bolt holes fourteen (5.3.2) of the irregular lower flange plate (5.3) in the top longitudinal reinforcement positioning and locking steel beam (5); The transverse load-bearing tie rod (9) includes an elongated steel tube (9.1), a tie rod (9.2), and a nut (9.3), wherein the inner diameter of the elongated steel tube (9.1) is slightly larger than the diameter of the tie rod (9.2) and the diameter of the four circular holes in the longitudinal load-bearing channel steel (8). The aperture of 8.1.1) serves both as a cantilever for the reinforcing cage to transfer its weight to the bearing channel steel (8) and as a support to prevent deformation of the bearing channel steel (8) on both sides during the bolt tightening process; The tie rod (9.2) is set inside the elongated cylindrical steel tube (9.1) and fixed at both ends by nuts (9.3).

9. The modular external steel cage prefabrication fixture for a nuclear-related thick wall structure according to claim 1, characterized in that, The short suspension beam (10) includes a steel section four (10.1) and several stiffening ribs six (10.2), which are welded together; wherein, the upper flange of the steel section four (10.1) is provided with several bolt holes seventeen ( 10.1.1), used for connection with lifting lug (11); the lower flange of section steel four (10.1) is provided with several bolt holes eighteen ( 10.1.1), used to connect with the top longitudinal reinforcement positioning and locking steel beam (5), and bolt holes eighteen ( The hole diameter and hole position of 10.1.1) are the same as the bolt hole thirteen (5.1.1) of the irregular upper flange plate two (5.1) in the top longitudinal reinforcement positioning and locking steel beam (5); the stiffening rib six (10.2) is arranged at the connection between the short hanging beam (10) and the top longitudinal reinforcement positioning and locking steel beam (5); The lifting lug (11) includes a lug plate (11.1) and a connecting plate seven (11.2), with the lug plate (11.1) disposed on the upper surface of the connecting plate seven (11.2); The ear plate (11.1) and the connecting plate seven (11.2) are welded together, wherein, A lifting hole (11.1.1) is provided in the center of the ear plate (11.1); several bolt holes (11.2.1) are provided on the connecting plate seven (11.2) for connecting with the short lifting beam (10), and the diameter and position of the bolt holes (11.2.1) are the same as the bolt holes (10.1.1) on the upper flange of the short lifting beam (10).

10. A construction method for a modular steel cage external prefabricated fixture for a nuclear-related thick wall structure according to any one of claims 1-9, characterized in that, The steps are as follows: (1) Assembly of the main body of the external prefabricated tooling; two ground beams (1) are arranged in the preset position on the flat ground; the bottom longitudinal reinforcement positioning steel beam (4) is connected to the ground beam (1) with several bolts (100); the column (2) is connected to the ground beam (1) and the bottom longitudinal reinforcement positioning steel beam (4) with several bolts (100); the diagonal brace (3) is connected to the ground beam (1) and the column (2) with several bolts (100); the two top longitudinal reinforcement positioning locking steel beams (5), the short lifting beam (10) and the lifting lug (11) are connected with several bolts (100) and then lifted as a whole and connected to the top of the column (2); (2) Binding of modular steel cage and assembly of external prefabricated fixtures; the longitudinal bars (12) of the steel cage are first inserted into the longitudinal bar positioning and locking sleeve (5.7) of the top longitudinal bar positioning and locking steel beam (5), and then inserted into the stepped constricted longitudinal bar positioning sleeve (4.6) of the bottom longitudinal bar positioning steel beam (4), and the longitudinal bars (12) are locked and fixed by tightening the hexagonal head bolts (5.7.3) in the longitudinal bar positioning and locking sleeve (5.7); the top longitudinal bars The positioning and locking steel beam (5) is connected and fixed in sequence with the F-shaped steel bar comb (6) and the inverted F-shaped steel bar comb (7); the top and bottom of the longitudinal bearing channel steel (8) are connected to the top longitudinal reinforcement positioning and locking steel beam (5) and the bottom longitudinal reinforcement positioning steel beam (4) respectively with several bolts (100), and the transverse bearing tie rod (9) is installed between the front and rear longitudinal bearing channel steels (8); then the transverse reinforcement (13) and tie rod (14) are inserted in sequence at the predetermined positions and tied and fixed. (3) Overall hoisting of modular steel cage; First, remove the connecting bolts (100) between the top longitudinal reinforcement positioning and locking steel beam (5) and the column (2) and between the longitudinal bearing channel steel (8) and the bottom longitudinal reinforcement positioning steel beam (4); Use the hoisting rope (15) to connect the hoisting lug (11) to the hoisting point below the long hoisting beam (16), and then use the hoisting rope (15) to connect the hoisting point on the long hoisting beam (16) to the hook; hoist the external prefabricated tooling and modular steel cage upward as a whole and move them smoothly to the position where the steel cage is to be connected; arrange the extrusion sleeve (17) between the end of the horizontal reinforcement (13) on the side of the steel cage, the end of the bottom longitudinal reinforcement (12) and the steel reinforcement to be connected, and use the steel reinforcement sleeve extrusion connection technology in the steel reinforcement mechanical connection method to firmly connect the two; (4) Retrieval of external prefabricated fixtures; After the steel cage is connected and fixed to the predetermined position, remove the transverse bearing tie rod (9); Rotate the fixing nuts 2 (6.4) and 3 (7.3) at the ends of the shaped steel bar comb (6) and the inverted F-shaped steel bar comb (7) to move them down and separate them from the contact with the transverse reinforcement (13), rotate the shaped steel bar comb (6) 90 degrees, move the inverted F-shaped steel bar comb (7) to the outermost edge of the elliptical long hole (5.1.2) and rotate it 90 degrees; Loosen the hexagonal head bolts (5.7.3) in the longitudinal reinforcement positioning locking sleeve (5.7) of the top longitudinal reinforcement positioning locking steel beam (5); Lift and retrieve the external prefabricated fixtures, and reconnect and fix them to the column (2) and the bottom longitudinal reinforcement positioning steel beam (4) to carry out the binding and hoisting work of the next steel cage, repeat the above steps until the steel reinforcement project is fully hoisted.

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