A method for accurately installing embedded parts in nuclear power plants

Abstract

The present invention relates to a method for the precise installation of embedded parts in a nuclear power plant, belonging to the technical field of civil construction of nuclear power plants. The method comprises the following steps: S1, dividing and manufacturing primary embedded parts and secondary embedded parts according to on-site construction requirements and force requirements; S2, on-site positioning and installation of the primary embedded parts; S3, pouring concrete for the floor slab structure layer; S4, plane positioning and elevation adjustment of the secondary embedded parts; S5, processing the gap between the primary embedded parts and the secondary embedded parts; S6, connecting and fixing the secondary embedded parts and the primary embedded parts; S7, pouring the building surface layer to complete the precise installation of the embedded parts. The method provided by the present invention can not only meet the installation precision requirements, but also improve construction efficiency, solve the unnecessary labor consumption caused by the inability to achieve installation precision, and has simple procedures, strong operability, and guaranteed quality control.

Description

Technical Field

[0001] The invention belongs to the technical field of civil construction of nuclear power plants, and specifically relates to a method for accurately installing embedded parts of nuclear power plants, which is used for accurately installing embedded parts of electrical instrument panels and cabinets of nuclear power plants. Background Art

[0002] Numerous embedded components exist within the nuclear island building. These components are crucial for securing pipes, equipment, and cabinets to walls and panels. Many embedded components in the nuclear island's electrical and instrumentation panels must meet a straightness requirement of 1mm / m. During the civil construction process, unavoidable factors such as concrete vibration, impact from pouring, and stress from concrete setting and hardening can hinder installation accuracy even with rigorous quality control at every stage.

[0003] To ensure the installation accuracy of embedded parts in electrical instrument panels, the previous solution involved manual grinding or adding flat steel to secure the parts. The former was labor-intensive and time-consuming, while the latter involved extensive welding, making adjustment and securing the secondary embedded parts difficult, and quality control challenging. To address these issues, a method for precise embedded part installation was developed, based on the full integration of design and construction and extensive practical experience, resulting in significant economic benefits. Summary of the Invention

[0004] In order to solve the defects of the prior art, the purpose of the present invention is to provide a method for accurately installing embedded parts in nuclear power plants, which can meet the installation accuracy requirements of embedded parts of electrical instrument panels and cabinets and improve construction efficiency.

[0005] In order to achieve the above purpose, a technical solution adopted by the present invention is:

[0006] A method for accurately installing embedded parts in a nuclear power plant, comprising the following steps:

[0007] S1. Divide and manufacture primary embedded parts and secondary embedded parts according to on-site construction requirements and force requirements;

[0008] S2. On-site positioning and installation of the primary embedded parts;

[0009] S3, pouring concrete for the floor slab structure layer;

[0010] S4, performing plane positioning and elevation adjustment on the secondary embedded parts;

[0011] S5, processing the gap between the primary embedded parts and the secondary embedded parts;

[0012] S6, connecting and fixing the secondary embedded part and the primary embedded part;

[0013] S7. Pour the building surface layer and complete the precise installation of embedded parts.

[0014] Furthermore, in the method for precise installation of embedded parts in nuclear power plants as described above, the division specifications of the primary embedded parts are 1m / piece along the length direction, and the thickness and width are determined according to the design documents; the division specifications of the secondary embedded parts and embedded plates are 1000mm long × width × height 150mm × 50mm, and the material is Q235B steel plate.

[0015] Furthermore, in the method for precise installation of embedded parts in nuclear power plants as described above, the primary embedded parts include primary embedded plate, and the bottom surface of the primary embedded plate is welded with multiple anchor nails equidistantly along the length direction, and the spacing and length of the anchor nails are determined according to the design documents.

[0016] Furthermore, in the method for precise installation of embedded parts in a nuclear power plant as described above, the secondary embedded parts include a secondary embedded part embedded plate and four secondary embedded part adjustment bolt pairs, the secondary embedded part adjustment bolt pairs include bolts and nuts, and the nuts are spot welded to the corners of the two side surfaces of the secondary embedded part embedded plate along the length direction.

[0017] Furthermore, in the method for precise installation of embedded parts in a nuclear power plant as described above, step S2 specifically comprises: tying and fixing the primary embedded parts to the floor reinforcement after accurate positioning, ensuring that the elevation of the top surface of the embedded plate of the primary embedded parts is 1 to 2 mm lower than the elevation of the top surface of the floor structure layer; fixing two adjacent primary embedded parts by spot welding on both side surfaces along the length direction of the embedded plate, and not connecting and fixing at the joints on the top surface of the embedded plate.

[0018] Furthermore, in the method for precise installation of embedded parts in a nuclear power plant as described above, the method for plane positioning of the secondary embedded parts in step S4 is specifically: placing the secondary embedded parts on the top surface of the embedded plate of the primary embedded parts, and adjusting the position of the secondary embedded parts so that the center line of the embedded plate of the secondary embedded parts along the length direction coincides with the center line of the embedded plate of the primary embedded parts along the length direction.

[0019] Furthermore, in the method for precise installation of embedded parts in a nuclear power plant as described above, the method for adjusting the elevation of the secondary embedded parts in step S4 is specifically as follows: adjusting the elevation of the top surface of the embedded plate of the secondary embedded parts by four bolts, measuring the elevation using a level rod and a level, fixing the bolts after precise positioning, and spot welding the primary embedded parts and the secondary embedded parts on both sides at a fixed distance along the length direction of the bottom edge of the embedded plate of the secondary embedded parts.

[0020] Furthermore, in the method for precise installation of embedded parts in a nuclear power plant as described above, in step S5, areas where the gap exceeds the design requirements are supported by steel plate washers of appropriate thickness depending on the extent of the gap.

[0021] Furthermore, in the method for precise installation of embedded parts in a nuclear power plant as described above, in step S6, the primary embedded part and the secondary embedded part are fully welded together by double-sided right-angle fillet welds along the length direction of the bottom edge of the embedded plate of the secondary embedded part.

[0022] Furthermore, in the method for precise installation of embedded parts in a nuclear power plant as described above, in step S7, the floor slab construction surface layer is poured so that the top surface of the embedded plate of the secondary embedded part is flush with the floor slab construction surface layer.

[0023] The method for accurately installing embedded parts for nuclear power plants according to the present invention has the following significant technical effects:

[0024] The present invention is formed on the basis of full integration of design and construction and extensive practice. It can not only meet the accuracy requirements for the installation of embedded parts of electrical instrument panels in nuclear power plants, but also improve construction efficiency and solve the problem of unnecessary labor consumption caused by the inability to achieve installation accuracy. In addition, the process is simple, the operability is strong, and the quality control is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a flow chart of a method for precise installation of embedded parts in a nuclear power plant provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of a primary embedded part;

[0027] Figure 3 This is a schematic diagram of the primary embedded parts positioning installation;

[0028] Figure 4 It is a schematic diagram of the composition and positioning of secondary embedded parts;

[0029] Figure 5 This is a schematic diagram of the secondary embedded parts elevation adjustment;

[0030] Figure 6 This is a schematic diagram of the fixed installation of secondary embedded parts;

[0031] Figure 7 This is a schematic diagram of the final effect after the embedded parts are accurately installed;

[0032] In the figure: 1-primary embedded parts, 11-primary embedded parts and embedded plates, 12-primary embedded parts and anchor nails, 2-secondary embedded parts, 21-secondary embedded parts and adjustment bolt pairs, 211-bolts, 212-nuts, 22-secondary embedded parts and embedded plates, 3-double-sided right-angle spot welding, 4-steel plate gaskets, 5-floor slab reinforcement, 6-floor slab structural layer, 7-level rod, 8-level, 9-double-sided right-angle fillet welds, 10-floor slab building surface layer. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to specific embodiments and the accompanying drawings.

[0034] In order to meet the installation accuracy requirements of embedded parts of electrical instrument panels in nuclear power plants and improve construction efficiency, the present invention proposes a method for precise installation of embedded parts in nuclear power plants based on the full integration of design and construction and extensive practice. Figure 1 A flow chart of the method is shown, which comprises the following steps:

[0035] S1. Make primary and secondary embedded parts according to on-site construction requirements and force requirements.

[0036] According to the on-site construction requirements and stress requirements, the embedded parts of the electrical instrument panel cabinet are divided and manufactured. Figure 2 As shown, the primary embedded component is segmented into 1m / piece along the length, with thickness and width determined by the design documents. The primary embedded component 1 includes an embedded plate 11, with several anchor pins 12 welded to its bottom surface at equal intervals along the length. The spacing and length of the anchor pins 12 are determined by the design documents.

[0037] like Figure 4 As shown, the secondary embedded component 2 includes a secondary embedded plate 22 and four secondary embedded adjustment bolt pairs 21. The secondary embedded plate 22 is made of Q235B steel plate cut to a size of 1000mm × 150mm × 50mm (length × width × height). The secondary embedded adjustment bolt pairs 21 include bolts 211 and nuts 212. Nuts 212 are spot-welded to the four corners of the secondary embedded plate 22 along its length, 100mm horizontally from the nearest edge of the secondary embedded plate 22 and centered along its thickness. Bolts 211 are no taller than 40mm, and nuts 212 are M10 in size, with a performance rating of 4.6.

[0038] S2. Position and install embedded parts on site.

[0039] like Figure 3 As shown, after accurate positioning, the primary embedded parts 1 are tied and fixed to the floor slab reinforcement 5, ensuring that the top surface elevation of the primary embedded plate 11 is 1-2 mm lower than the top surface elevation of the floor slab structural layer 6. Two adjacent primary embedded parts 1 are fixed by spot welding along the length of the embedded plate, and the joint at the top surface of the embedded plate is not connected or fixed.

[0040] S3. Pour concrete for the floor slab structure layer.

[0041] After completing the positioning and installation of the primary embedded parts, then start pouring the floor structure layer concrete. After completing the pouring of the floor structure layer, the top surface of the embedded plate 11 of the primary embedded parts 1 is cleaned up and tidy, and no residual concrete is allowed.

[0042] S4. Perform plane positioning and elevation adjustment on secondary embedded parts.

[0043] like Figure 4As shown, the plane positioning of the secondary embedded part 2 is determined according to the design document. The bottom surface of the secondary embedded part embedded plate 22 is placed on the top surface of the primary embedded part embedded plate 11, and the position of the secondary embedded part 2 is adjusted so that the center line of the secondary embedded part embedded plate 22 along the length direction coincides with the center line of the primary embedded part embedded plate 11 along the length direction, thus completing the plane positioning of the secondary embedded part 2.

[0044] like Figure 5 As shown, the elevation of the top surface of the secondary embedded plate 22 is adjusted by four bolts 211, and the elevation is measured using a level rod 7 and a level 8. Point A is any point between the reference point on the floor slab and the embedded part to be measured. After precise positioning, the bolts are fixed, and the primary and secondary embedded parts are spot welded on both sides at a fixed distance along the length direction of the bottom edge of the secondary embedded plate 22, with a spacing of 200 mm.

[0045] S5. Process the gap between the primary embedded parts and the secondary embedded parts.

[0046] like Figure 4 、 Figure 6 As shown, check whether the gap between the primary embedded parts 1 and the secondary embedded parts 2 meets the design requirements. For areas where the gap exceeds the design requirements, support them with steel plate gaskets 4 of appropriate thickness depending on the excess situation.

[0047] S6. Connect and fix the secondary embedded parts and the primary embedded parts.

[0048] like Figure 6 As shown in the figure, the primary embedded part 1 and the secondary embedded part 2 are connected by full right-angle fillet welds along the length direction of the bottom edge of the secondary embedded part plate. The fillet weld height h f =10mm.

[0049] S7. Pour the building surface layer.

[0050] like Figure 7 As shown, the floor slab construction surface layer 10 is poured so that the top surface of the secondary embedded plate 22 is flush with the floor slab construction surface layer 10.

[0051] The present invention provides a method for precise installation of embedded parts in nuclear power plants. The method is formed on the basis of full integration of design and construction and extensive practice. It can not only meet the installation precision requirements, but also improve construction efficiency, solve the problem of unnecessary labor consumption caused by the inability to achieve installation precision, and has simple procedures, strong operability and guaranteed quality control.

[0052] The above embodiments are merely illustrative of the present invention, and the present invention may also be implemented in other specific ways or in other specific forms without departing from the gist or essential characteristics of the present invention. Therefore, the described embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is to be determined by the appended claims, and any variations equivalent to the intent and scope of the claims are intended to be within the scope of the present invention.

Claims

1. A method for accurately installing embedded parts in a nuclear power plant, comprising the following steps: S1. Divide and manufacture primary embedded parts and secondary embedded parts according to on-site construction requirements and force requirements; S2. On-site positioning and installation of the primary embedded parts; S3, pouring concrete for the floor slab structure layer; S4, performing plane positioning and elevation adjustment on the secondary embedded parts; S5, processing the gap between the primary embedded parts and the secondary embedded parts; S6, connecting and fixing the secondary embedded part and the primary embedded part; S7. Pour the building surface layer and complete the precise installation of embedded parts; The secondary embedded parts include a secondary embedded plate and four secondary embedded adjustment bolt pairs, the secondary embedded adjustment bolt pairs include bolts and nuts, and the nuts are spot welded to the corners of the two side surfaces of the secondary embedded plate along the length direction respectively; The method for plane positioning of the secondary embedded parts in step S4 is specifically as follows: placing the secondary embedded parts on the top surface of the embedded plate of the primary embedded parts, and adjusting the position of the secondary embedded parts so that the center line of the embedded plate of the secondary embedded parts along the length direction coincides with the center line of the embedded plate of the primary embedded parts along the length direction; The method for adjusting the elevation of the secondary embedded parts in step S4 is specifically as follows: adjusting the elevation of the top surface of the embedded plate of the secondary embedded parts by four bolts, measuring the elevation by using a level rod and a level, accurately positioning and fixing the bolts, and spot welding the primary embedded parts and the secondary embedded parts on both sides at a fixed distance along the length direction of the bottom edge of the embedded plate of the secondary embedded parts; In step S5, for areas where the gap exceeds the design requirements, steel plate washers of appropriate thickness are used to support the gap depending on the extent of the gap. In step S6, the primary embedded part and the secondary embedded part are fully welded together by double-sided right-angle fillet welds along the length direction of the bottom edge of the secondary embedded part plate.

2. The method for precise installation of embedded parts in a nuclear power plant according to claim 1, characterized in that: The division specification of the primary embedded parts is 1m / piece along the length direction, and the thickness and width are determined according to the design documents; the division specification of the secondary embedded parts is length×width×height 1000mm×150mm×50mm, and the material is Q235B steel plate.

3. The method for precise installation of embedded parts in a nuclear power plant according to claim 2, characterized in that: The primary embedded part includes a primary embedded plate, and a plurality of anchor nails are welded on the bottom surface of the primary embedded plate at equal intervals along the length direction. The spacing and length of the anchor nails are determined according to the design documents.

4. The method for precise installation of embedded parts in a nuclear power plant according to claim 3, characterized in that: Step S2 specifically includes: tying and fixing the primary embedded parts to the floor slab reinforcement after accurate positioning, ensuring that the elevation of the top surface of the embedded plate of the primary embedded parts is 1 to 2 mm lower than the elevation of the top surface of the floor slab structure layer; fixing two adjacent primary embedded parts by spot welding on both side surfaces along the length direction of the embedded plate, and not connecting and fixing the joints at the top surface of the embedded plate.

5. The method for precise installation of embedded parts in a nuclear power plant according to claim 1, characterized in that: In step S7, the floor slab construction surface layer is poured so that the top surface of the secondary embedded plate is flush with the floor slab construction surface layer.

Images