A steel bar positioning device and method for a heavy shear wall in a nuclear power plant building

Abstract

The present invention relates to a positioning device and method for the steel bars of a heavy shear wall in a nuclear power plant building, which includes at least two positioning structures connected by cross beams. The positioning mechanism is enclosed by a top bracket, a bottom bracket and side brackets. The top bracket, the bottom bracket and the side brackets all include a first member and a second member arranged in parallel. A plurality of steel bar positioning mechanisms and limit members are provided between the first member and the second member. Among them, the steel bar positioning mechanisms of the top bracket and the bottom bracket are arranged correspondingly, and the steel bar positioning mechanisms of the two side brackets are arranged correspondingly. The steel bar positioning mechanism includes a first support connected to the first member and a second support connected to the second member, and further includes a support member for being arranged between the first support and the second support. The support member cooperates with the first support and the second support to position two steel bars. The positioning device of the present invention is applicable to the positioning of the steel bars of a heavy shear wall.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant construction, and in particular to a steel bar positioning device and method for a heavy shear wall of a nuclear power plant. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Nuclear power plants utilize reinforced concrete shear wall structures to withstand vertical and horizontal loads. Heavy-duty shear wall structures are employed when the dimensions and reinforcement of traditional thin walls do not meet design requirements. Compared to conventional thin shear wall structures with a single layer of reinforcement on one side, heavy-duty shear wall structures require significantly higher design parameters, including significantly increased wall thickness and rebar diameter. Two layers of rebar (two layers each of vertical and horizontal) are typically installed on one side of the wall. During shear wall construction, the rebar must be positioned and tied. Currently, wall reinforcement is primarily installed on-site by direct tying each rebar individually. For heavy-duty shear walls, since they have two layers of rebar on one side, construction requires manual positioning and tying of the vertical and horizontal rebar, one by one, from the inside out and from the bottom up. Due to the large number of rebar layers, their large diameter, and their weight, rebar positioning and tying must be performed entirely manually, resulting in significant construction effort and safety risks, low efficiency, and long work hours. Due to the large diameter of the rebar, on-site bending and adjustment are extremely difficult. The positioning and spacing of the rebar are poorly controlled, making it difficult to ensure the quality and consistency of the binding. Furthermore, heavy shear walls in nuclear power plants often feature large, heavy embedded components with numerous and long anchor bars. These components must be installed only after the wall reinforcement is completed. However, due to the poor positioning accuracy of the wall reinforcement, the embedded anchor bars often cannot be installed or require bending and adjustment, significantly increasing the construction complexity and making it difficult to ensure the quality of the embedded components.

[0004] Currently, there are relatively few patent studies and applications related to shear wall reinforcement binding and shaping. Patent publication number CN109594783A proposes a shear wall reinforcement binding and shaping tool, patent publication number CN110670806 A proposes a shear wall reinforcement binding and shaping method, and patent publication number CN110918839 A proposes a reinforcement binding positioning and assembly auxiliary jig.

[0005] The inventors found that for patents CN109594783A and CN11091883A, due to the lack of support and positioning devices between multiple layers of steel bars, the proposed tooling can only be applied to the positioning and binding of single-layer horizontal and vertical steel bars, and cannot be applied to the overall binding of steel bars on both sides of the wall or the assembled binding of multiple layers of steel bars on one side. For patent CN110670806A, the steel bar positioning device of the proposed tooling is a frame structure, which can position the steel bars on both sides of the wall at the same time, and has a certain expansion in function, and can meet the overall positioning and binding of the bilateral steel bars of conventional thin shear walls; however, similar to the previous two patents, due to the lack of support and positioning devices between multiple layers of steel bars, this tooling cannot be applied to the nuclear power heavy shear wall with two layers of vertical and horizontal steel bars arranged on one side of the wall. Although the above three toolings can improve the construction efficiency of conventional thin shear walls to a certain extent, due to the limitations of their tooling designs, they cannot meet the construction requirements of the overall positioning and assembly of steel bars in heavy shear walls, and the improvement of construction efficiency is very limited. In addition, the above three toolings cannot be used for the overall pre-installation of large embedded parts, and the problems of difficult installation and difficult quality control of embedded parts have not been effectively solved. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, and provides a modular construction device for steel bars of heavy shear walls in nuclear power plants, which solves the problems of difficult control of steel bar spacing, poor positioning accuracy, and difficult guarantee of binding quality in the current construction method of heavy shear walls; solves the problems of high labor intensity, large safety risks, low construction efficiency and long construction time in the current construction method, and also solves the problem that the existing steel bar binding and positioning tooling cannot be applied to heavy shear walls.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions

[0008] In a first aspect, an embodiment of the present invention provides a steel bar positioning device for a heavy shear wall in a nuclear power plant, including at least two positioning structures connected by a cross beam. The positioning mechanism is enclosed by a top bracket, a bottom bracket and a side bracket. The top bracket, the bottom bracket and the side bracket all include a first member and a second member arranged in parallel. There are multiple steel bar positioning mechanisms and limiters between the first member and the second member. Among them, the steel bar positioning mechanisms of the top bracket and the bottom bracket are arranged correspondingly, and the steel bar positioning mechanisms of the two side brackets are arranged correspondingly. The steel bar positioning mechanism includes a first support connected to the first member and a second support connected to the second member, and further includes a support member for being arranged between the first support and the second support. The support member cooperates with the first support and the second support to position two steel bars.

[0009] Optionally, the first support is a first support plate, which is fixed to the first member. The end of the first support plate facing the second member is provided with a first positioning groove matching the steel bar. The second support is a second support plate, which is fixed to the second member. The end of the second support plate facing the first member is provided with a second positioning groove matching the steel bar.

[0010] Optionally, the support member includes a connecting rod. One end of the connecting rod is provided with a first clamping plate matching the first positioning groove. The first clamping plate can form a space for the steel bar to pass through with the first positioning groove. The other end of the connecting rod is provided with a second clamping plate matching the second positioning groove. The second clamping plate can form a space for the steel bar to pass through with the second positioning groove.

[0011] Optionally, both the first member and the second member of the top bracket adopt a truss structure, including a rectangular frame. A plurality of vertical supports are arranged inside the rectangular frame, and diagonal supports are arranged on both sides of the vertical supports.

[0012] Optionally, the cross beam between the top brackets of the plurality of positioning mechanisms is located corresponding to the position of the vertical support.

[0013] Optionally, both the first member and the second member of the bottom bracket and the side bracket adopt rod-shaped members.

[0014] Optionally, the limiting member is a limiting tube, and the limiting tube is fixedly connected to the first member and the second member through fasteners.

[0015] Optionally, the fastener is a bolt. The bolt passes through the first member, the limiting tube and the second member in sequence and then tightens the nut. The head of the bolt and the nut press and fix the first member, the limiting tube and the second member.

[0016] Optionally, a plurality of lifting lugs are arranged on the upper surface of the top bracket.

[0017] In a second aspect, an embodiment of the present invention provides a method for positioning steel bars of a heavy shear wall in a nuclear power plant building, including the following steps:

[0018] Step 1: Assemble the first members of the top bracket, the bottom bracket and the side bracket, and place the first members horizontally.

[0019] Step 2: Place the first-layer horizontal and vertical steel bars in the positioning grooves of the first support. Install a plurality of limiting members on the first member. The placed horizontal and vertical steel bars cooperate with one end of the support member, and then bind the steel bars.

[0020] Step 3: Place the second-layer horizontal and vertical steel bars at the other end of the support member and bind and fix the second-layer horizontal and vertical steel bars.

[0021] Step 4: After assembling the second components of the top bracket, bottom bracket and side bracket, hoist them, so that the positioning groove of the second support seat cooperates with the horizontal and vertical steel bars of the second layer, and fix the limiting parts to the first component and the second component to complete the assembly of one positioning mechanism and the steel bars;

[0022] Step 5: Fix the cross beam on the upper surface of the second component, and repeat Steps 1 - 4 to complete the assembly of the second positioning mechanism and the steel bars. The first component of the upper positioning mechanism is fixed to the cross beam connected to the lower positioning mechanism, and so on in a cycle to complete the assembly of multiple positioning mechanisms and the steel bars;

[0023] Step 6: Remove the side bracket and bottom bracket, hoist the formed steel bar mesh to the vertical state through the top bracket and hoist it to the set position at the construction site, connect the steel bars of the steel bar mesh with the steel bars of the already constructed part, and remove the top bracket to complete the installation of the shear wall steel bar cage.

[0024] Advantages of the present invention:

[0025] 1. For the steel bar positioning device of the present invention, the first support seat is arranged on the first component, the second support seat is arranged on the second component, and a support member can be placed between the first support seat and the second support seat. Both ends of the support member can respectively cooperate with the positioning grooves on the first support seat and the second support seat to position two steel bars at the same time. Therefore, the positioning of two layers of vertical and horizontal steel bars in the wall body is realized, overcoming the defect that the existing steel bar positioning tooling cannot be applied to double-layer steel bar positioning, and meeting the construction requirements for the overall positioning and assembly of steel bars in heavy shear walls.

[0026] 2. For the method of the steel bar positioning device of the present invention, the steel bar positioning device is pre-assembled with the steel bars and then hoisted to the construction site, which can separate the binding of wall steel bars and the installation of embedded parts from the on-site construction sequence. The corresponding wall steel bar cages can be prefabricated in the factory in advance and the embedded parts can be installed before the on-site construction, which can greatly shorten the on-site steel bar binding and embedded part installation time, reduce the construction difficulty and improve the construction efficiency.

[0027] 3. For the method of the steel bar positioning device of the present invention, since the whole positioning device is horizontally placed when assembled with the steel bars, the steel bars are also horizontally placed, improving the vertical operation mode of the current wall steel bar binding to a horizontal binding mode. The steel bars during the binding process are not in a vertical state, eliminating the possibility of the steel bar cage becoming unstable, and greatly improving the construction safety. Description of the Drawings

[0028] The specification drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation to this application.

[0029] Figure 1Schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0030] Figure 2 Front view of the overall structure of Embodiment 1 of the present invention;

[0031] Figure 3 Side view of the overall structure of Embodiment 1 of the present invention;

[0032] Figure 4 Assembly schematic diagram of the top brackets of the first positioning mechanism and the second positioning mechanism in Embodiment 1 of the present invention;

[0033] Figure 5 Schematic diagram of the structure of the first component of the top bracket in Embodiment 1 of the present invention;

[0034] Figure 6 For the present invention Figure 5 Partial enlarged schematic diagram at position A;

[0035] Figure 7 Schematic diagram of the structure of the first support in Embodiment 1 of the present invention;

[0036] Figure 8 Schematic diagram of the structure of the support member in Embodiment 1 of the present invention;

[0037] Figure 9 Schematic diagram of the structure of the limiting tube in Embodiment 1 of the present invention;

[0038] Figure 10 Schematic diagram of the cooperation of the first bolt and the first nut in Embodiment 1 of the present invention;

[0039] Figure 11 Assembly schematic diagram of the side brackets of the first positioning mechanism and the second positioning mechanism in Embodiment 1 of the present invention;

[0040] Figure 12 Schematic diagram of the first component of the side bracket in Embodiment 1 of the present invention;

[0041] Figure 13 For the present invention Figure 12 Partial enlarged schematic diagram at position B;

[0042] Figure 14 Assembly schematic diagram of the bottom brackets of the first positioning mechanism and the second positioning mechanism in Embodiment 1 of the present invention;

[0043] Figure 15 Assembly schematic diagram of the second bolt and the second nut in Embodiment 1 of the present invention;

[0044] Among them, 1. top bracket, 2. side bracket, 3. bottom bracket, 4. top cross beam, 5. first member, 6. second member, 7. first base rod seat, 8. second base rod seat, 9. vertical support, 10. diagonal brace, 11. first support, 12. second support, 13. connecting rod, 14. first clamping plate, 15. second clamping plate, 16. limiting tube, 17. first bolt, 18. first nut, 19. opening, 20. lifting lug plate, 21. second bolt, 22. second nut, 23. first positioning groove, 24. node plate, 25. lifting hole, 26. side cross beam, 27. bottom cross beam. Detailed implementation manner

[0045] In this embodiment, the heavy shear wall refers to a shear wall with two layers of steel bar meshes arranged at both the A side and the B side of the wall. The A side and the B side refer to two relatively large opposite wall surfaces of the shear wall. The steel bar mesh is formed by vertically and horizontally cross-binding and fixing vertical steel bars and horizontal steel bars.

[0046] Embodiment 1

[0047] This embodiment provides a steel bar positioning device for the heavy shear wall of a nuclear power plant building, as Figures 1 - 3 shown, including at least two positioning mechanisms. In this embodiment, two positioning mechanisms are provided, namely the first positioning mechanism and the second positioning mechanism. The structures of the first positioning mechanism and the second positioning mechanism are the same. The first positioning mechanism is used to position the steel bars of the two layers of steel bar meshes on the A side of the heavy shear wall, and the second positioning mechanism is used to position the steel bars of the two layers of steel bar meshes on the B side of the heavy shear wall.

[0048] The first positioning mechanism and the second positioning mechanism are connected by a plurality of cross beams, so that the first positioning mechanism and the second positioning mechanism form an integral structure.

[0049] The structures of the first positioning mechanism and the second positioning mechanism are exactly the same. Taking the first positioning mechanism as an example for illustration:

[0050] The first positioning mechanism includes a top bracket 1, a bottom bracket 3 and a side bracket 2 located at the same-side ends of the top bracket 1 and the bottom bracket 3. The top bracket 1, the bottom bracket 3 and the side bracket 2 jointly enclose a rectangular frame structure matching the heavy shear wall.

[0051] The top bracket 1, the side bracket 2 and the bottom bracket 3 all include a first member 5 and a second member 6 arranged in parallel. A plurality of limiting members and steel bar positioning mechanisms are arranged between the first member 5 and the second member 6, and the steel bar positioning mechanisms and the limiting members are alternately distributed.

[0052] Specifically, in the top bracket, as Figures 4 - 10As shown in the figure, both the first member 5 and the second member 6 adopt a truss structure. The first member 5 and the second member 6 both include a rectangular frame, and the rectangular frame includes two first base rod seats 7 and two second base rod seats 8 arranged in parallel. Both the first base rod seat 7 and the second base rod seat 8 are made of rectangular steel pipes. A plurality of vertical supports 9 are arranged between the first base rod seat 7 and the second base rod seat 8. Among them, the vertical supports 9 at both ends together with the first base rod seat 7 and the second base rod seat 8 enclose a rectangular frame. One end of the vertical support 9 is fixedly welded to the first base rod seat 7, and the other end is fixedly welded to the second base rod seat 8.

[0053] Among them, on both sides of the non-end vertical support 9, diagonal braces 10 are arranged. Slots are provided at both ends of the diagonal brace 10, and a gusset plate 24 is inserted into the slots, and the diagonal brace 10 is fixedly welded to the gusset plate 24. The gusset plate 24 is fixedly welded between the vertical support 9 and the base rod seat, thus realizing the fixation of the diagonal brace 10.

[0054] Since the top bracket functions as a lifting tool for the steel reinforcement cage during use, its first member 5 and second member 6 adopt a truss structure, which has high structural strength and ensures the stability and safety of lifting.

[0055] A plurality of limiting members and steel bar positioning mechanisms are arranged between the first base rod seats 7 of the first member 5 and the second member 6 in the X direction. A plurality of limiting members and steel bar positioning mechanisms are arranged between the second base rod seats 8 of the first member 5 and the second member 6 in the X direction.

[0056] Wherein the X direction is the length direction of the first base rod seat 7 and the second base rod seat 8, and the direction perpendicular to the X direction is the Y direction.

[0057] The setting methods of the limiting members and the steel bar positioning mechanisms between the two first base rod seats 7 and the two second base rod seats 8 are exactly the same, and the steel bar positioning mechanisms of the two first base rod seats 7 and the steel bar positioning mechanisms of the two second base rod seats 8 are arranged at corresponding positions, so that a vertical steel bar can pass through the corresponding steel bar positioning mechanisms between the two first base rod seats and the two second base rod seats.

[0058] The setting methods of the steel bar positioning mechanisms and the limiting members between the two first base rod seats 7 and the two second base rod seats 8 are the same. Taking the steel bar positioning mechanisms and the limiting members between the two first base rod seats 7 as an example for description:

[0059] The steel bar positioning mechanism includes a first support 11 and a second support 12 which are arranged oppositely. The first support 11 is fixed on the first base bar seat 7 of the first component 5, and the second support 12 is fixed on the first base bar seat 7 of the second component 6. The first support is a first support plate, and the first support plate is welded and fixed to the first base bar seat 7 of the first component. A first positioning groove 23 matching the steel bar is arranged on the end face of the first support plate close to the second support. The first positioning groove 23 is a semi-circular groove. The second support 12 is a second support plate, and the second support plate is welded and fixed to the first base bar seat 7 of the second component 6. A second positioning groove is formed on the end face of the second support 12 close to the first support 11, and the second positioning groove is a semi-circular groove.

[0060] In this embodiment, both the first support plate and the second support plate are square steel plates with a thickness of 8 - 12 mm.

[0061] A support member can be placed between the first support 11 and the second support 12. The support member includes a connecting rod 13. A first clamping plate 14 is welded and fixed to one end of the connecting rod 13, and a second clamping plate 15 is welded and fixed to the other end. Both the first clamping plate 14 and the second clamping plate 15 are U-shaped plates matching the steel bar. The first clamping plate 14 can cooperate with the first positioning groove 23 to position the vertical steel bars in the first layer of steel bar mesh on the A surface of the shear wall, and the second clamping plate 15 can cooperate with the second positioning groove to position the vertical steel bars in the other layer of steel bar mesh on the A surface of the shear wall.

[0062] The distance between adjacent first supports 11 and adjacent second supports 12 is determined according to the design drawing of the shear wall. In this embodiment, the distance between adjacent first supports 11 and adjacent second supports 12 is 150 mm - 300 mm to meet the design requirements of different walls.

[0063] The limiting member is arranged between two adjacent steel bar positioning mechanisms. One end of the limiting member is attached to the first base bar seat 7 of the first component 5, and the other end is attached to the first base bar seat 7 of the second component 6, and is used to support the second component 6 above the first component 5 when the whole positioning device is horizontally placed for assembly.

[0064] The limiting member is a limiting tube 16. The limiting tube 16 is a circular hollow steel pipe, and the limiting tube 16 is fixedly connected to the first base bar seats 7 of the first component 5 and the second component 6 through fasteners.

[0065] Specifically, the fastener uses the first bolt 17. The screw part of the first bolt 17 sequentially passes through the first base rod seat 7 of the first member 5, the limiting tube 16, and the first base rod seat 7 of the second member 6, and then is threadedly connected to the first nut 18. The head of the first bolt 17 presses against the first base rod seat 7 of the first member 5, and the first nut 18 presses against the first base rod seat 7 of the second member 6, thereby realizing the fixed connection of the first base rod seats of the first member 5 and the second member 6 to form an integral body. An opening 19 for the first bolt to pass through is provided on the first base rod seat 7.

[0066] The arrangement of the steel bar positioning mechanism and the limiting member between the second base rod seats 8 of the first member 5 and the second member 6 is the same as that described above, and will not be repeated here.

[0067] In this embodiment, the second base rod seat 8 is used to connect to the side bracket. A plurality of lifting lugs are provided on the upper surface of the first base rod seat 7. The lifting lugs use lifting lug plates 20, and lifting holes 25 are provided on the lifting lug plates.

[0068] As Figures 11 - 13 shown, the side bracket also includes a first member 5 and a second member 6. Both the first member 5 and the second member 6 adopt rod-shaped structures. The first member 5 and the second member 6 of the side bracket are both made of rectangular steel pipes. One end of the first member 5 of the side bracket is fixedly connected to the end of the second base rod seat 8 of the first member of the top bracket through a right-angle connecting piece or a screw, and one end of the second member 6 is fixedly connected to the end of the second base rod seat 8 of the second member of the top bracket through a right-angle connecting piece or a screw.

[0069] A plurality of alternately arranged steel bar positioning mechanisms and limiting members are provided between the first member 5 and the second member 6 of the side bracket. The steel bar positioning mechanism here is used to position the horizontal steel bars of the steel bar mesh.

[0070] The steel bar positioning mechanisms of the two side brackets are arranged correspondingly.

[0071] The structure of the steel bar positioning mechanism is the same as that of the steel bar positioning mechanism of the top bracket, and also includes a first support 11 and a second support 12 arranged opposite to each other. The first support 11 is provided with a first positioning groove 23, and the second support 12 is provided with a second positioning groove. A support member can be placed between the first support and the second support. By cooperating with the two end parts of the support member with the first support and the second support respectively, the horizontal steel bars of the two layers of steel bar meshes on the A surface of the shear wall are positioned.

[0072] The limiting member also uses the limiting tube 16, and the fastener uses the first bolt 17. The screw part of the first bolt 17 passes through the first member 5, the limiting tube 16, and the second member 6 of the side bracket in sequence through the opening and then the first nut 18 is tightened to realize the fixation of the first member 5 and the second member 6 of the side bracket.

[0073] AsFigure 14 As shown, the structural form of the bottom bracket is exactly the same as that of the side bracket, and it also includes a first member 5 and a second member 6. A plurality of steel bar positioning mechanisms and limit members are arranged between the first member 5 and the second member 6, and the positions of the steel bar positioning mechanisms of the bottom bracket correspond to the positions of the steel bar positioning mechanisms of the top bracket.

[0074] A limit member is also arranged between the first member 5 and the second member 6 of the bottom bracket. The limit member adopts a limit tube 16, and the limit tube is fixed to the first member 5 and the second member 6 through a first bolt 17 and a first nut 18.

[0075] The structures of the steel bar positioning mechanisms and limit members of the bottom bracket are the same as those of the steel bar positioning mechanisms and limit members of the top bracket and the side bracket, and will not be repeated here.

[0076] One end of the first member 5 of the bottom bracket is fixed to the end of the first member 5 of the side bracket on one side through a right-angle connector or a screw, and the other end is fixed to the end of the first member of the side bracket on the other side through a right-angle connector or a screw. One end of the second member of the bottom bracket is fixed to the end of the second member of the side bracket on one side through a right-angle connector or a screw, and the other end is fixed to the end of the second member of the side bracket on the other side through a right-angle connector or a screw.

[0077] The structure of the second positioning mechanism is exactly the same as that of the first positioning mechanism and will not be repeated here. The second positioning mechanism is used to position the two-layer steel bar mesh at the B surface position of the heavy shear wall.

[0078] The first positioning mechanism and the second positioning mechanism are connected into a whole through a plurality of cross beams.

[0079] Specifically, among the top bracket, the side bracket and the bottom bracket, a plurality of cross beams are arranged between the second member of the first positioning mechanism and the first member of the second positioning mechanism.

[0080] The number of top cross beams 4 corresponding to the top bracket is 2N, where N is the number of vertical supports included in the first member of the top bracket, and the position of the cross beam corresponds to the end position of the vertical support.

[0081] One side cross beam 26 corresponding to the side bracket and one bottom cross beam 27 corresponding to the bottom bracket are provided for every 5 - 8 steel bars.

[0082] Such as Figure 15As shown in the figure, in this embodiment, the cross beam is made of a rectangular hollow steel pipe. The fixing methods of the cross beams of the bottom bracket, the side bracket and the bottom bracket are the same. The cross beam is fixed to the first member and the second member through the second bolt 21 and the second nut 22. The screw part of the second bolt 21 sequentially passes through the first member and the second member of the first positioning mechanism, the cross beam, the first member and the second member of the second positioning mechanism, and then the second nut 22 is screwed on. The head of the second bolt 21 and the second nut 22 are used to press and fix the first positioning mechanism, the second positioning mechanism and the cross beam.

[0083] During assembly, a cushion block needs to be placed under the first member of the positioning mechanism located below to facilitate the installation of the first nut and the second nut.

[0084] In the positioning device of this embodiment, both ends of the support member can be respectively matched with the positioning grooves on the first support 11 and the second support 12, and the two steel bars are positioned at the same time. Therefore, the positioning of the two layers of vertical steel bars and horizontal steel bars in the wall body is realized, breaking through the limitation of the prior art which is only applicable to the positioning of single-layer steel bars, and having a wider application range. It can not only cover the coverage range of the prior art, but also be applicable to the accurate positioning and binding of the steel bars of the heavy shear wall with multiple layers of horizontal and vertical steel bars arranged on both sides; through the design of the steel bar positioning mechanism, the positioning of each steel bar is ensured to be accurate and the support is stable.

[0085] Embodiment 2

[0086] This embodiment provides a method for the steel bar positioning device of the heavy shear wall of a nuclear power plant building described in Embodiment 1, including the following steps:

[0087] Step 1: Assemble the first members 5 of the bottom bracket 3, the side bracket 2 and the top bracket 1 of the first positioning mechanism, and fix the first members of the bottom bracket 3, the side bracket 2 and the top bracket 1 of the first positioning mechanism through right-angle connectors or screws to form a rectangular frame structure. The rectangular frame structure is horizontally arranged, and the first positioning groove of the first support faces upward. The formed frame structure is hoisted onto the cushion block.

[0088] Step 2: Locate and place the embedded parts of the A-side wall according to the design drawings. According to the requirements of the drawing design, place the outermost vertical steel bars on the A side in the first positioning grooves 23 of the first supports 11 of the bottom bracket 3 and the top bracket 1, and place the outermost horizontal steel bars on the A side in the first positioning grooves 23 of the first supports 11 of the two side brackets. A limiting pipe 16 is arranged between two adjacent steel bars. The placed horizontal steel bars and vertical steel bars are tied and fixed to form the first layer of steel bar mesh. Then, place the support member so that the first clamping plate 14 of the support member clamps the placed steel bars, and use the first clamping plate 14 and the first positioning groove 23 to position the outermost horizontal steel bars and vertical steel bars on the A side.

[0089] Step 3: Place the steel bars of the other layer of the steel bar mesh on the A side of the wall in the second clamping plate 15 at the other end of the support member, including horizontal steel bars and vertical steel bars, and bind and fix the horizontal steel bars and vertical steel bars to form the second layer of the steel bar mesh on the A side.

[0090] Step 4: Fix the second members of the bottom bracket 3, the side bracket 2 and the top bracket 1 of the first positioning mechanism through right-angle connectors or screws to enclose a rectangular frame structure, and then hoist the rectangular frame structure. During hoisting, the second positioning groove of the second support 12 is set downward so that the second positioning groove of the second support 12 catches the steel bars of the second layer of the steel bar mesh. The screw part of the first bolt 17 passes through the second member 6, the limiting tube 16 and the first member 5 in sequence and then tightens the first nut 18 to complete the assembly and positioning of the first positioning mechanism and the steel bar mesh on the A side of the shear wall.

[0091] Step 5: Place a cross beam on the upper surfaces of all the second members 6 of the first positioning mechanism, repeat Steps 1 - 4 to install the second positioning mechanism, and position the second positioning mechanism with the horizontal steel bars and vertical steel bars on the B side of the wall. Among them, the first member of the second positioning mechanism contacts the top end of the cross beam. After the screw part of the second bolt 21 passes through the second member and the first member of the second positioning mechanism, the cross beam, the second member and the first member of the first positioning mechanism, tighten the second nut 22 so that the first positioning mechanism and the second positioning mechanism are connected into a whole. At this time, the positioning of the positioning device with the steel bar mesh on the A side and the steel bar mesh on the B side of the wall is completed.

[0092] In this embodiment, the embedded anchor bars of the placed embedded parts are bound and fixed to the fixed steel bars through binding wires.

[0093] Step 6: Remove the side bracket and the bottom bracket. Since the top bracket 1 of the first positioning mechanism and the second positioning mechanism is still connected to the vertical steel bars, the top bracket 1 can be used as a lifting tool for the formed four-layer steel bar mesh. Use a crane and a lifting lug to lift the steel bar mesh and the top bracket to a vertical state and transport them to the construction site. Connect the steel bars of the steel bar mesh to the constructed steel bars through steel sleeves, and then remove the top bracket to complete the installation of the shear wall steel cage. The overall hoisting and positioning by a crane and the connection with the existing steel bars through steel sleeves can reduce the labor intensity of on-site workers, shorten the construction time, and greatly reduce the safety operation risk.

[0094] In the method of this embodiment, the reinforcement cage can be prefabricated in the factory in advance. The binding of the wall reinforcement and the installation of the embedded parts can be separated from the on-site construction sequence. The corresponding wall reinforcement cage can be prefabricated in the factory in advance and the embedded parts can be installed before the on-site construction, which can greatly shorten the on-site reinforcement binding and embedded part installation time, reduce the construction difficulty, improve the construction efficiency. Moreover, the reinforcement cage can be continuously fabricated without waiting for the concrete pouring and strength formation, which can greatly improve the production efficiency of the reinforcement workers and save human resources. In addition, in the method of this embodiment, the current vertical operation mode of wall reinforcement binding is improved to horizontal binding. During the binding process, the reinforcement is not in a vertical state, eliminating the possibility of the reinforcement cage instability and greatly improving the construction safety.

[0095] In summary, by adopting the positioning device and method of this embodiment, accurate positioning can be simultaneously carried out on the multi-layer vertical and horizontal reinforcements arranged on both sides of the heavy shear wall, and the positioning error can be controlled within 1 mm. The large embedded parts can be integrally pre-installed, which can improve the construction quality while reducing the construction difficulty of the wall reinforcement and the embedded parts. In addition, the construction method proposed in this embodiment can improve the current direct binding method to modular prefabrication and installation of the overall wall reinforcement cage, and through parallel processing in the reinforcement factory, it can greatly improve the on-site construction efficiency and shorten the construction period, and can greatly reduce the labor intensity of the on-site construction personnel and reduce the construction risk.

[0096] Although the specific implementation manners of the present invention are described above in conjunction with the drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A positioning device for the steel bars of a heavy shear wall in a nuclear power plant building, characterized in that, It includes at least two positioning structures connected by a cross beam. The positioning mechanism is enclosed by a top bracket, a bottom bracket, and side brackets. The top bracket, bottom bracket, and side brackets all include a first member and a second member arranged in parallel. A plurality of steel bar positioning mechanisms and limit members are provided between the first member and the second member. Among them, the steel bar positioning mechanisms of the top bracket and the bottom bracket are arranged correspondingly, and the steel bar positioning mechanisms of the two side brackets are arranged correspondingly. The steel bar positioning mechanism includes a first support connected to the first member and a second support connected to the second member, and further includes a support member for being arranged between the first support and the second support. The support member cooperates with the first support and the second support to position two steel bars. The first support is a first support plate, the first support plate is fixed to the first member, and a first positioning groove matching the steel bar is provided at the end of the first support plate facing the second member. The second support is a second support plate, the second support plate is fixed to the second member, and a second positioning groove matching the steel bar is provided at the end of the second support plate facing the first member. The support member includes a connecting rod. A first clamping plate matching the first positioning groove is provided at one end of the connecting rod. The first clamping plate can form a space for the steel bar to pass through with the first positioning groove. The other end of the connecting rod is provided with a second clamping plate matching the second positioning groove. The second clamping plate can form a space for the steel bar to pass through with the second positioning groove. The fastener is a bolt. The bolt passes through the first member, the limit tube, and the second member in sequence and then tightens the nut. The head of the bolt and the nut press and fix the first member, the limit tube, and the second member.

2. The heavy shear wall steel bar positioning device for a nuclear power plant building according to claim 1, characterized in that, The first member and the second member of the top bracket both adopt a truss structure, including a rectangular frame, and a plurality of vertical supports are arranged inside the rectangular frame. Diagonal supports are provided on both sides of the vertical supports.

3. The positioning device for heavy shear wall steel bars in a nuclear power plant building according to claim 2, characterized in that, The cross beam between the top brackets of the plurality of positioning mechanisms is located corresponding to the position of the vertical supports.

4. A heavy shear wall steel bar positioning device for a nuclear power plant building according to claim 1, characterized in that, The first member and the second member of the bottom bracket and the side brackets both adopt rod-shaped members.

5. The heavy shear wall steel bar positioning device for a nuclear power plant building according to claim 1, wherein The limit member is a limit tube, and the limit tube is fixedly connected to the first member and the second member through fasteners.

6. The heavy shear wall steel bar positioning device for a nuclear power plant building according to claim 1, wherein, A plurality of lifting lugs are provided on the upper surface of the top bracket.

7. A method for a steel bar positioning device of a heavy shear wall in a nuclear power plant building according to any one of claims 1-6, comprising the following steps: Step 1: Assemble the first members of the top bracket, the bottom bracket, and the side brackets. The first members are arranged horizontally. Step 2: Place the first-layer horizontal and vertical steel bars in the positioning grooves of the first supports. Install a plurality of limit members on the first member. The placed horizontal and vertical steel bars cooperate with one end of the support member, and then carry out the binding of the steel bars. Step 3: Place the second-layer horizontal and vertical steel bars at the other end of the support member and carry out the binding and fixing of the second-layer horizontal and vertical steel bars. Step 4: Assemble and hoist the second members of the top bracket, the bottom bracket, and the side brackets, so that the positioning grooves of the second supports cooperate with the second-layer horizontal and vertical steel bars, and fix the limit members to the first member and the second member to complete the assembly of one positioning mechanism and the steel bars. Step 5: Fix the cross beam on the upper surface of the second component, and repeat Step 1 - Step 4 to complete the assembly of the second positioning mechanism and the steel bars. The first component of the upper positioning mechanism is fixed to the cross beam connected to the lower positioning mechanism, and so on in a cycle to complete the assembly of multiple positioning mechanisms and steel bars; Step 6: Remove the side brackets and bottom brackets, lift the formed steel bar mesh to a vertical state through the top bracket and hoist it to the set position at the construction site, connect the steel bars of the steel bar mesh with the steel bars of the already constructed part, and remove the top bracket to complete the installation of the shear wall steel bar cage.

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