A double-layer combined reinforcing tool and step-by-step reinforcing construction method for a vertical inclined sleeve of a nuclear power plant

Abstract

This invention relates to the field of nuclear power plant civil engineering pre-embedded sleeve construction technology, and particularly to a double-layer combined reinforcement fixture and step-by-step reinforcement construction method for nuclear power plant vertical inclined sleeves. The fixture includes: a detachable temporary reinforcement fixture, a prefabricated long-term permanent reinforcement fixture, a vertical inclined sleeve, and wall structure reinforcement bars. The vertical inclined sleeve is movably inserted through a channel in the wall structure reinforcement bars, with its two ends extending to the inner and outer sides of the wall structure to be poured. The prefabricated long-term permanent reinforcement fixture is installed on the inclined upper part of the vertical inclined sleeve and is tied and fixed to the wall structure reinforcement bars. The detachable temporary reinforcement fixture is detachably installed on the inclined lower part of the vertical inclined sleeve to provide temporary support and constraint during the hoisting stage of the vertical inclined sleeve. This invention provides a double-layer combined reinforcement fixture and step-by-step reinforcement construction method that can achieve stable positioning of the inclined sleeve throughout its entire lifecycle, while also considering construction safety, pre-embedding accuracy, and cost reduction and efficiency improvement.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant civil engineering pre-embedded sleeve construction technology, and in particular to a double-layer combined reinforcement tooling and a step-by-step reinforcement construction method for nuclear power plant vertical inclined sleeves. Background Technology

[0002] The walls of the nuclear island plant contain numerous vertically inclined sleeves with significant weight and steep angles. These sleeves, with their large diameters and inclined arrangement, are highly susceptible to slippage, overturning, and falling during the entire construction cycle, from sleeve hoisting and placement to rebar tying and concrete pouring. This poses a major safety hazard due to the high-altitude sleeves falling, and also risks causing deviations in the embedded axis, elevation, and angle of inclination, making it impossible to connect electromechanical pipelines later. Current traditional reinforcement methods rely solely on single-sided on-site welding of reinforcing bars for one-time fixation, which has multiple technical drawbacks. 1. During the casing hoisting stage, there is no temporary support constraint, and the casing is only supported and positioned manually. The casing is prone to tipping over and slipping during high-altitude operations, making safety management extremely difficult. 2. With tie bars only on one side, the stress is uneven under the lateral pressure of the concrete pouring, the sleeve is offset in one direction, and the pre-embedded accuracy is difficult to meet the high-precision acceptance standards for nuclear power. 3. All reinforcement bars are welded on-site with hot air. The hot air approval process in the nuclear island area is cumbersome, and the quality of the welds is difficult to control uniformly, which can easily lead to weld failure. 4. There is no layered reinforcement logic, the temporary hoisting limit and the permanent fixing process are confused, all the reinforcement parts are permanently buried in concrete after pouring, the consumption of materials is large and cannot be reused. 5. The bottom of the casing lacks support and restraint, making it prone to sinking or floating under its own weight. The positional deviation of the upper and lower ends of the casing exceeds the standard, resulting in a large amount of rework and rectification in the later stage. Summary of the Invention

[0003] The purpose of this invention is to provide a double-layer combined reinforcement tooling and a step-by-step reinforcement construction method for vertical inclined sleeves in nuclear power plants, so as to achieve stable positioning of the inclined sleeves throughout the entire cycle, while taking into account construction safety, pre-embedding accuracy and cost reduction and efficiency improvement, so as to solve the technical problems existing in the background art.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: A double-layer combined reinforcement fixture for a nuclear power plant vertical inclined sleeve includes: a detachable temporary reinforcement fixture, a prefabricated long-term permanent reinforcement fixture, a vertical inclined sleeve, and wall structure reinforcement bars. The vertical inclined sleeve is movably inserted through a channel in the wall structure reinforcement bars, with its two ends extending to the inner and outer sides of the wall structure to be poured. The prefabricated long-term permanent reinforcement fixture is installed on the inclined upper part of the vertical inclined sleeve and is tied and fixed to the wall structure reinforcement bars. The detachable temporary reinforcement fixture is detachably installed on the inclined lower part of the vertical inclined sleeve to provide temporary support and constraint during the hoisting stage of the vertical inclined sleeve.

[0005] Furthermore, the vertical inclined sleeve is an axially continuous steel sleeve structure, and the two end faces of the vertical inclined sleeve in the inclined direction are parallel to the inner and outer facades of the wall structure to be poured, respectively.

[0006] Furthermore, the wall structure reinforcement includes horizontal bars and vertical bars, and a plurality of horizontal bars and vertical bars are provided, with the plurality of horizontal bars and the plurality of vertical bars respectively welded and fixed at the intersection point.

[0007] Furthermore, the prefabricated long-term permanent reinforcement fixture includes: a Z-shaped fixing frame, wherein two Z-shaped fixing frames are provided, and the two Z-shaped fixing frames are respectively welded and fixed to the upper and lower sides of the outer wall of the inclined upper part of the vertical sleeve, and the two Z-shaped fixing frames are respectively tied and tied to the wall structure steel bars adjacent to them.

[0008] Furthermore, the two Z-shaped fixing brackets are vertically coplanar and their openings are positioned opposite each other; the welding length of the legs at both ends of each Z-shaped fixing bracket to the vertical inclined sleeve is ≥30mm.

[0009] Furthermore, the zigzag fixing frame is formed by bending φ12 round steel.

[0010] Furthermore, the detachable temporary reinforcement fixture is a hook, and there are two hooks. One end of the two hooks respectively clamps the axial outer wall of the upper and lower sides of the inclined vertical sleeve, and the other end of the two hooks can be detachably tied to fix the reinforcing steel of the wall structure.

[0011] Furthermore, the detachable temporary reinforcement fixture includes: a diagonal brace, the lower end of which is supported on the top of the floor slab, and the upper end of which is pressed against the lower port of the inclined vertical sleeve.

[0012] A step-by-step reinforcement construction method for vertical inclined sleeves in nuclear power plants, utilizing a double-layer combined reinforcement fixture, includes the following steps: Step 1: Weld two Z-shaped fixing brackets to the upper and lower sides of the outer wall of the inclined upper part of the vertical sleeve outside the site. The welding length of the legs at both ends of each Z-shaped fixing bracket to the vertical sleeve is ≥30mm. Step 2: Hoist the vertical inclined sleeve to the designed pre-embedded inclination angle and elevation. Select detachable temporary reinforcement tools according to the size of the on-site construction space. If the on-site space meets the conditions for inclined bracing, support the lower end of the inclined brace on the top of the floor slab and tighten the upper end of the inclined brace against the lower end of the inclined vertical sleeve. If the on-site space does not meet the conditions for inclined bracing, clamp one end of each of the two hooks onto the axial outer walls of the upper and lower sides of the inclined lower part of the vertical sleeve, and detachably tie the other ends of the two hooks to the wall structure reinforcement. Step 3: Secure the two prefabricated Z-shaped fixing brackets on the vertical inclined sleeve to the wall structure steel bars at multiple points using tie wires; Step 4: After the wall structure steel reinforcement is fixed and passes the concealed inspection, remove the diagonal braces or hooks before the wall formwork is closed. Step 5: Set up the wall formwork and carry out concrete pouring and vibration operations.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the provision of detachable temporary reinforcement fixtures, can withstand the self-weight of the vertical inclined sleeve during the hoisting and reinforcement binding stages, preventing it from falling from a height. By symmetrically welding two Z-shaped fixing frames on the upper and lower sides of the outer wall of the inclined upper part of the vertical inclined sleeve and binding the two Z-shaped fixing frames to the wall structure reinforcement, the force can be evenly distributed during the concrete pouring and vibration stages to prevent the vertical inclined sleeve from shifting. This invention covers the entire process of vertical inclined sleeve installation to completion, simultaneously solving safety risks and problems of excessive pre-embedded accuracy.

[0014] 2. Hooks and diagonal braces are only used for temporary support. They can be completely removed and reused before formwork construction. There is no one-time consumption of pre-embedded steel materials. Long-term batch construction can significantly reduce the procurement cost of tooling materials.

[0015] 3. The Z-shaped fixing frame is pre-welded in the vertical inclined sleeve prefabrication plant, and only binding and fixing are required on the construction site, which saves a lot of on-site welding and weld flaw detection procedures, simplifies the nuclear island hot work approval process, and improves on-site construction efficiency.

[0016] 4. The upper and lower sides of the outer wall of the inclined vertical sleeve are equipped with permanent tie structures, which evenly distribute the lateral pressure of the concrete and prevent unidirectional offset, floating or sinking. The inclination angle, axis and elevation deviation of the vertical inclined sleeve can be controlled, which greatly reduces the amount of work required for subsequent electromechanical connection and rectification.

[0017] 5. All tooling components are made of conventional building steel, and the manufacturing process is simple; the construction process is standardized, and ordinary civil engineering technicians can complete the reinforcement work step by step without the need for professional welders to be stationed on site for a long time.

[0018] 6. This invention distinguishes five standardized steps: prefabrication, hoisting, permanent locking, dismantling of temporary fixtures, and pouring. The process nodes are clearly defined, which facilitates quality acceptance and safety inspection at the nuclear power construction site and ensures strong traceability of the project. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram showing the connection between the zigzag fixing frame and the vertical inclined sleeve in this invention; Figure 4This is a schematic diagram of the zigzag fixing frame in this invention.

[0020] The labels in the attached diagram are: 1-hook, 2-diagonal brace, 3-vertical diagonal sleeve, 4-zigzag fixing bracket, 5-wall structural steel reinforcement. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] See Figures 1-4 As shown, a double-layer combined reinforcement fixture for a nuclear power plant vertical inclined sleeve includes: a detachable temporary reinforcement fixture, a prefabricated long-term permanent reinforcement fixture, a vertical inclined sleeve 3, and wall structure steel bars 5. The vertical inclined sleeve 3 is movably inserted through a channel on the wall structure steel bars 5, with its two ends extending to the inner and outer sides of the wall structure to be poured. The prefabricated long-term permanent reinforcement fixture is installed on the inclined upper part of the vertical inclined sleeve 3 and is tied and fixed to the wall structure steel bars 5. The detachable temporary reinforcement fixture is detachably installed on the inclined lower part of the vertical inclined sleeve 3 to provide temporary support and constraint during the hoisting stage of the vertical inclined sleeve 3.

[0023] In this embodiment, the vertical inclined sleeve 3 is an axially continuous steel sleeve structure, and the two end faces of the vertical inclined sleeve 3 in the inclined direction are parallel to the inner and outer facades of the wall structure to be poured, respectively.

[0024] In this embodiment, the wall structure reinforcement 5 includes: horizontal bars and vertical bars. Several horizontal bars and several vertical bars are provided. Several horizontal bars are welded and fixed to several vertical bars at the intersection points, or are fixed and connected by binding wire.

[0025] In this embodiment, the prefabricated long-term permanent reinforcement fixture includes: a Z-shaped fixing frame 4, two Z-shaped fixing frames 4 are provided, the two Z-shaped fixing frames 4 are respectively welded and fixed to the upper and lower sides of the outer wall of the inclined upper part of the vertical inclined sleeve 3, and the two Z-shaped fixing frames 4 are respectively tied and tied to the wall structure steel bars 5 adjacent to them; during the pouring, the lateral pressure of the concrete is evenly offset to prevent the vertical inclined sleeve 3 from shifting in one direction.

[0026] In this embodiment, the two U-shaped fixing frames 4 are vertically coplanar and their openings face each other; the welding length of the legs at both ends of each U-shaped fixing frame 4 to the vertical inclined sleeve 3 is ≥30mm; the welding points avoid the wall structure steel bars 5; the U-shaped fixing frames 4 and the vertical inclined sleeve 3 are welded together during the prefabrication stage of the vertical inclined sleeve 3; on site, they are only tied to the wall structure steel bars 5 by binding, without the need for on-site hot work.

[0027] In this embodiment, the Z-shaped fixing frame 4 is formed by bending φ12 round steel.

[0028] In this embodiment, the detachable temporary reinforcement fixture is: hook 1. There are two hooks 1. One end of the two hooks 1 respectively clamps the axial outer wall of the upper and lower sides of the inclined sleeve 3. The other end of the two hooks 1 can be detachably tied to the wall structure steel bars 5.

[0029] In this embodiment, the detachable temporary reinforcement fixture includes: a diagonal brace 2, the lower end of which is supported on the top of the floor slab, and the upper end of which is pressed against the lower port of the inclined vertical sleeve 3.

[0030] Hook 1 and diagonal brace 2 are both standard steel parts, with no need for permanent pre-embedding. The single vertical diagonal sleeve 3 is removed after construction and can be transferred to other sleeves for reuse.

[0031] A step-by-step reinforcement construction method for vertical inclined sleeves in nuclear power plants includes the following steps: Step 1: During the off-site prefabrication stage of the vertical inclined sleeve 3, weld two Z-shaped fixing brackets 4 to the upper and lower sides of the outer wall of the inclined upper part of the vertical inclined sleeve 3. The welding length between the legs at both ends of each Z-shaped fixing bracket 4 and the vertical inclined sleeve 3 is ≥30mm. Grind and remove weld beads and slag to ensure that the welding position does not interfere with the wall structure steel bars 5. Step 2: Use hoisting equipment to lift the heavy vertical inclined sleeve 3 to the pre-embedded position in the wall and adjust it to the preset tilt angle. Select detachable temporary reinforcement tools according to the size of the construction space. If the space meets the support conditions of the inclined brace 2, support the lower end of the inclined brace 2 on the top of the floor slab and tighten the upper end of the inclined brace 2 against the lower end of the inclined vertical sleeve 3. If the space does not meet the support conditions of the inclined brace 2, clamp one end of the two hooks 1 to the axial outer walls of the upper and lower sides of the inclined vertical sleeve 3 respectively, and detachably tie the other end of the two hooks 1 to the wall structure steel bars 5. Rely on the detachable temporary reinforcement tools to support the self-weight of the vertical inclined sleeve 3 and prevent it from tilting and slipping during the hoisting and reinforcement binding stages. Step 3: Secure the two prefabricated Z-shaped fixing brackets 4 on the vertical inclined sleeve 3 to the wall structure steel bars 5 at multiple points using tie wires to form a double-sided permanent constraint system. Re-measure the axis, elevation, and inclination angle of the vertical inclined sleeve 3 to ensure they are correct. Step 4: After the wall structure steel reinforcement 5 is fixed and passes the concealed inspection, before the wall formwork is closed, remove the diagonal brace 2 or hook 1, clean the surface cement slag, and transfer it to other places in the same area where vertical diagonal sleeves 3 are to be pre-embedded for recycling. Step 5: Erect wall formwork and carry out concrete pouring and vibration operations; rely on the Z-shaped fixing frames on both sides of the vertical inclined sleeve 3 to evenly tie and constrain, resist the lateral pressure of concrete pouring and vibration, lock the axis, elevation and inclination of the vertical inclined sleeve 3 throughout the process, and complete the pre-embedding after curing and shaping. The pre-embedding dimensions meet the nuclear power design standards.

[0032] The tooling structure of this invention is simple and the supporting construction methods are standardized. It can be widely used in the pre-embedded construction of various large-diameter, large-angle heavy vertical inclined sleeves in nuclear islands and conventional islands, with significant safety, quality and economic benefits.

[0033] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the technical solution of the present invention, based on the technical essence of the present invention, shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A double-layer combined reinforcement fixture for a vertical inclined sleeve in nuclear power plants, characterized in that, include: The equipment includes a detachable temporary reinforcement fixture, a prefabricated long-term permanent reinforcement fixture, a vertical inclined sleeve (3), and wall structure reinforcement (5). The vertical inclined sleeve (3) is movably inserted through the channel on the wall structure reinforcement (5) and its two ends extend to the inner and outer sides of the wall structure to be poured. The prefabricated long-term permanent reinforcement fixture is set on the inclined upper part of the vertical inclined sleeve (3) and is tied and fixed with the wall structure reinforcement (5). The detachable temporary reinforcement fixture is detachably installed on the inclined lower part of the vertical inclined sleeve (3) and is used to provide temporary support and constraint during the hoisting stage of the vertical inclined sleeve (3).

2. The double-layer combined reinforcement fixture for a vertical inclined sleeve of a nuclear power plant according to claim 1, characterized in that: The vertical inclined sleeve (3) is an axially continuous steel sleeve structure. The two end faces of the vertical inclined sleeve (3) in the inclined direction are parallel to the inner and outer facades of the wall structure to be poured, respectively.

3. The double-layer combined reinforcement fixture for a vertical inclined sleeve of a nuclear power plant according to claim 1, characterized in that: The wall structure reinforcement (5) includes: horizontal bars and vertical bars, and there are several horizontal bars and several vertical bars. The several horizontal bars are welded and fixed to the several vertical bars at the intersection.

4. The double-layer combined reinforcement fixture for a vertical inclined sleeve of a nuclear power plant according to claim 1, characterized in that: The prefabricated long-term permanent reinforcement fixture includes: a Z-shaped fixing frame (4), two Z-shaped fixing frames (4) are provided, the two Z-shaped fixing frames (4) are respectively welded and fixed on the upper and lower sides of the outer wall of the inclined upper part of the vertical inclined sleeve (3), and the two Z-shaped fixing frames (4) are respectively tied and tied to the wall structure steel bars (5) adjacent to them.

5. The double-layer combined reinforcement fixture for a nuclear power plant vertical inclined sleeve according to claim 4, characterized in that: Two Z-shaped fixing brackets (4) are vertically coplanar and their openings are opposite each other; the welding length of the legs at both ends of each Z-shaped fixing bracket (4) to the vertical inclined sleeve (3) is ≥30mm.

6. The double-layer combined reinforcement fixture for a nuclear power plant vertical inclined sleeve according to claim 5, characterized in that: The zigzag fixing frame (4) is formed by bending φ12 round steel.

7. The double-layer combined reinforcement fixture for a nuclear power plant vertical inclined sleeve according to claim 6, characterized in that: The detachable temporary reinforcement fixture is a hook (1). There are two hooks (1). One end of the two hooks (1) respectively holds the axial outer wall of the upper and lower sides of the inclined sleeve (3). The other end of the two hooks (1) respectively detachably connects and fixes the wall structure steel bars (5).

8. The double-layer combined reinforcement fixture for a vertical inclined sleeve of a nuclear power plant according to claim 6, characterized in that: The detachable temporary reinforcement fixture includes: a diagonal brace (2), the lower end of which is supported on the top of the floor slab, and the upper end of which is pressed against the lower port of the inclined vertical sleeve (3).

9. A step-by-step reinforcement construction method for vertical inclined sleeves of nuclear power plants, utilizing the double-layer combined reinforcement fixture described in claim 7 or 8, characterized in that: Includes the following steps: Step 1: Weld two Z-shaped fixing brackets (4) to the upper and lower sides of the outer wall of the inclined upper part of the vertical inclined sleeve (3) outside the field. The welding length between the legs at both ends of each Z-shaped fixing bracket (4) and the vertical inclined sleeve (3) is ≥30mm. Step 2: Hoist the vertical inclined sleeve (3) to the designed pre-embedded inclination angle and elevation, and select detachable temporary reinforcement tools according to the size of the on-site construction space; if the on-site space meets the support conditions of the inclined brace (2), support the lower end of the inclined brace (2) on the top of the floor slab, and press the upper end of the inclined brace (2) against the lower port of the inclined part of the vertical inclined sleeve (3); if the on-site space does not meet the support conditions of the inclined brace (2), clamp one end of the two hooks (1) on the axial outer wall of the upper and lower sides of the inclined part of the vertical inclined sleeve (3) respectively, and detachably tie the other end of the two hooks (1) to fix the wall structure steel bars (5). Step 3: Secure the two prefabricated Z-shaped fixing brackets (4) on the vertical inclined sleeve (3) to the wall structure steel bars (5) using multiple binding wires; Step 4: After the wall structure steel reinforcement (5) is fixed and passes the concealed inspection, remove the diagonal brace (2) or hook (1) before the wall formwork is closed. Step 5: Set up the wall formwork and carry out concrete pouring and vibration operations.

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