A process for assembling a sealed storage tank basket

Abstract

The present application belongs to the assembly process method, and particularly relates to a sealed storage tank basket assembly process method. The sealed storage tank basket assembly process method comprises the following steps: step 1, building an assembly platform; step 2, making a tooling; step 3, assembling a support plate lifting tooling; step 4, nested assembly; step 5, lifting and placing; step 6, positioning and error correction; step 7, plumb line control; and step 8, height revision. The present application has the following remarkable effects: (1) a cast iron platform, a support plate, an equal height block, a jack, a pressing plate and a level are used to build an assembly datum platform, which lays a foundation for subsequent assembly and measurement; (2) a storage sleeve lifting tooling is made, which ensures that the storage sleeve is vertically and stably lifted and prevents collision with adjacent storage sleeves; and (3) a support plate lifting tooling is assembled by using a support plate, a pull rod and a nut in the basket, and the support plate is lifted at the lower end of the tooling, thereby solving the lifting problem of the support plate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of assembly process, and particularly relates to a kind of sealed storage tank basket assembly process. BACKGROUND

[0002] The current spent fuel dry storage technology can be roughly divided into three forms: dry well storage, storage room storage and container storage. Container storage can be divided into metal container storage and concrete dry container storage. Concrete dry storage container uses concrete structure as radiation protection material, and generally adopts open storage mode. The key difference from metal container is that the concrete structure of concrete container does not have containment performance, so the fuel assembly needs to be loaded into a sealed storage tank, and the sealed storage tank is automatically welded at a distance after sealing, and then placed into the concrete structure module for storage by using a transfer container. On the basis of ensuring safety and the same operation, the equipment production cycle is short, which can meet the demand of spent fuel export of nuclear power plant as soon as possible, and is an important technical route of metal dry storage container in the world at present.

[0003] The sealed storage tank basket parts designed by a design institute provide containment, inert environment, structural support and critical control for spent fuel. The basket is composed of top plate assembly, storage sleeve, support plate, boron aluminum plate, aluminum plate, aluminum block, distance tube and connecting rod. The storage sleeve and the connecting rod are vertically distributed and penetrate through each layer of support plate. Each layer of boron aluminum plate, aluminum plate, aluminum block and distance tube is separated by each layer of support plate. The boron aluminum plate and the aluminum plate are assembled in the form of mutual nesting between the storage sleeves and placed on each layer of support plate. The basket requires that the spacing tolerance between each storage sleeve after assembly is ±0.5mm (not cumulative). The basket has many assembly parts and requires very high assembly precision, and there is no experience to be referred to in assembly in China. SUMMARY

[0004] The present application provides a kind of sealed storage tank basket assembly process method for the defects of prior art.

[0005] The present application is implemented as follows: a kind of sealed storage tank basket assembly process method, wherein, including the following steps:

[0006] Step 1: build an assembly platform;

[0007] Step 2: make tooling;

[0008] Step 3: assemble the support plate lifting tooling;

[0009] Step 4: nested assembly;

[0010] Step 5: hoist and place;

[0011] Step 6: positioning and error correction;

[0012] Step 7: vertical control;

[0013] Step 8: height revision.

[0014] The sealing storage tank hanging basket assembly process method as claimed in the above, wherein the step 1 comprises,

[0015] The cast iron platform, the support plate and the equal height block at the bottom, the jack, the pressing plate and the level are used to build the assembly datum platform.

[0016] The sealing storage tank hanging basket assembly process method as claimed in the above, wherein the step 2 comprises,

[0017] The tooling is divided into two parts, the bottom and the top, and is respectively made.

[0018] The sealing storage tank hanging basket assembly process method as claimed in the above, wherein the step 2 comprises,

[0019] The bottom and the top of the tooling are respectively placed at the bottom end and the top end of the storage sleeve to realize the hoisting function, the middle of the tooling is connected through the lifting rope, four L-shaped rib plates are welded on the bottom plate of the tooling, the L-shaped rib plates are positioned at the inner side of the bottom of the storage sleeve, the outer side dimension of the bottom plate is between the storage outer side and the square hole of the support plate, and it is ensured that the bottom hoisting tooling can meet the requirements of lifting the storage sleeve and passing through the square hole of each layer of support plate.

[0020] The sealing storage tank hanging basket assembly process method as claimed in the above, wherein the step 3 comprises,

[0021] The support plate hoisting tooling is assembled by the combination of the part support plate, the pull rod and the nut in the hanging basket, the support plate at the upper end of the tooling plays the role of the hoisting tooling, and the support plate at the lower end of the tooling is the support plate that needs to be assembled.

[0022] The sealing storage tank hanging basket assembly process method as claimed in the above, wherein the step 4 comprises,

[0023] When the support plate is assembled and inserted into the storage sleeve for about one layer height from top to bottom, the boron aluminum plate and the aluminum plate are assembled, the boron aluminum plate and the aluminum plate are sequentially and mutually nested between the top storage sleeves, and the boron aluminum plate and the aluminum plate are placed on the assembled support plate hoisting tooling.

[0024] The sealing storage tank hanging basket assembly process method as claimed in the above, wherein the step 5 comprises,

[0025] Slowly hoist the support plate hoisting tool to the assembly layer, support the support plate to the assembly layer with a jack support after the next layer of the periphery of the aluminum block is not assembled, and then sequentially disassemble the support plate hoisting tool bottom nut, finally twist the jack to make the four directions of the support plate fall smoothly to the lower layer of the periphery of the aluminum block to ensure that the support plate is placed stably, and prevent mutual collision and damage to the surface plating of the support plate.

[0026] The sealing storage tank hanging basket assembly process method, wherein, the step 6 includes, the support plate, the aluminum block, the aluminum plate, the periphery aluminum block and the fixed distance pipe are assembled about 3-5 layers, and the positioning rod is inserted into the pull rod hole of the assembled aluminum block and the support plate to carry out layering deviation correction.

[0027] The sealing storage tank hanging basket assembly process method, wherein, the step 7 includes,

[0028] The assembly process uses a level to detect the flatness of each layer of support plate, and a side hanging pendant to measure the verticality of the side surface. When the verticality is large, the hand-operated hoist is used to accurately control the slight deviation correction of the pull rod and the periphery aluminum block, to ensure that the verticality of every two 90-degree aluminum blocks meets the requirements.

[0029] The sealing storage tank hanging basket assembly process method, wherein, the step 8 includes,

[0030] After assembly, the nuts are tightened to compress each assembly layer and measure the total height of the hanging basket assembly. If the height is out of tolerance, the height direction size of the assembly parts except the support plate of the top layer is processed.

[0031] The significant effects of the present application are: (1) a cast iron platform, a support plate and an equal height block at the bottom layer, a jack, a pressing plate and a level are used to build an assembly reference platform, which lays a foundation for subsequent assembly and measurement.

[0032] (2) a storage sleeve hoisting tool is made to ensure that the storage sleeve is vertically vertical and hoisted stably, and to prevent collision between adjacent storage sleeves.

[0033] (3) the support plate hoisting tool is assembled by the support plate, the pull rod and the nut in the hanging basket, and the support plate is hoisted at the lower end of the tool, which solves the hoisting problem of the support plate.

[0034] (4) the boron aluminum plate and the aluminum plate are assembled when the support plate is assembled from top to bottom and inserted into the storage sleeve about one layer height, and the boron aluminum plate and the aluminum plate are placed in the assembly support plate hoisting tool, which solves the operation difficulty of the boron aluminum plate and the aluminum plate nested assembly, and ensures that the whole support plate, the boron aluminum plate and the aluminum plate are assembled from top to bottom to the specified position.

[0035] (5) Slowly hoist the support plate hoisting tool to the assembly layer, and support the support plate with a jack at the position where the next layer of peripheral aluminum blocks is not assembled as a gap after the support plate is hoisted to the assembly layer, and then the bottom nuts of the support plate hoisting tool are sequentially disassembled. Finally, the jack is twisted to make the four directions of the support plate stably fall onto the lower layer of peripheral aluminum blocks to ensure that the support plate is stably placed and prevent mutual collision and damage to the surface plating of the support plate.

[0036] (6) After the support plate, aluminum block, aluminum plate, peripheral aluminum block, and distance tube are assembled for about 3-5 layers, a positioning rod is inserted into the pull rod hole of the assembled aluminum block and support plate to correct the layer deviation and ensure the subsequent assembly reference.

[0037] (7) During the assembly process, a level instrument is used to detect the flatness of each layer of support plates, and a side-suspended pendant is used to measure the verticality of the side. When the verticality is large, a hand-operated hoist is used to accurately correct the slight deviation of the pull rod and the peripheral aluminum block, ensuring that the verticality of every two 90-degree aluminum blocks meets the requirements and correcting the human assembly error deviation during the assembly process, thereby satisfying the overall assembly accuracy identification basis.

[0038] (8) After the assembly is completed, the total height of the hanging basket assembly is measured by tightening the nuts to compress each assembly layer. If the height is out of tolerance, the assembly height direction size of the top layer assembly parts except the support plate is adjusted to solve the total height size tolerance problem of the hanging basket assembly. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 Storage sleeve hoisting tool

[0040] Figure 2 Support plate hoisting tool

[0041] In the figure, the serial number is: 1. The upper end of the hoisting tool; 2. The storage sleeve; 3. The lower end of the hoisting tool; 4. The support plate for hoisting; 5. The pull rod; 6. The support plate for product assembly DETAILED DESCRIPTION

[0042] A sealing storage tank hanging basket assembly process method, comprising the following steps:

[0043] 1) A cast iron platform, a support plate and an equal height block at the bottom, a jack, a pressing plate, and a level instrument are used to build an assembly reference platform, which lays a foundation for subsequent assembly and measurement.

[0044] 2) The storage sleeve lifting tool is made of two parts, bottom and top, which are placed at the bottom and top of the storage sleeve respectively to realize the lifting function. The middle of the tool is connected by a lifting rope. Four L-shaped rib plates are welded on the bottom plate of the lifting tool. The L-shaped rib plates are positioned inside the bottom of the storage sleeve. The outer dimension of the bottom plate is between the outer side of the storage and the square hole of the support plate, which ensures that the bottom lifting tool can lift the storage sleeve and pass through the square hole of each layer of support plate. It ensures that the storage sleeve is vertical and stable during lifting, preventing collision with adjacent storage sleeves.

[0045] 3) The support plate lifting tool is assembled by combining the support plate, pull rod and nut in the basket. The support plate at the upper end of the tool serves as the lifting tool, and the support plate at the lower end is the support plate that needs to be assembled, solving the problem of lifting the support plate.

[0046] 4) When the support plate is assembled and inserted into the storage sleeve about one layer height, the boron aluminum plate and aluminum plate are assembled. The boron aluminum plate and aluminum plate are nested and assembled between each storage sleeve at the top, and placed on the assembled support plate lifting tool. This solves the problem of nested assembly of boron aluminum plate and aluminum plate, and ensures that each layer of support plate, boron aluminum plate and aluminum plate is assembled from top to bottom to the specified position.

[0047] 5) Slowly lift the support plate lifting tool to the assembly layer. After the support plate is lifted to the assembly layer, use a jack to support and hold the support plate at the next layer of aluminum block without assembly. Then, disassemble the nuts at the bottom of the support plate lifting tool. Finally, turn the jack to make the support plate fall smoothly in four directions to the next layer of aluminum block, ensuring that the support plate is placed smoothly and preventing damage to the surface plating of the support plate.

[0048] 6) After assembling about 3-5 layers of support plate, aluminum block, aluminum plate, aluminum block and distance tube, use a positioning rod to insert the pull rod hole of the assembled aluminum block and support plate to correct the layer deviation. This method decomposes the assembly error in different areas and ensures the subsequent assembly reference.

[0049] 7) During assembly, use a level to detect the flatness of each layer of support plate, and hang a pendant on the side to measure the verticality of the side. When the verticality is large, use a hand-operated hoist to accurately control the slight deviation of the pull rod and the surrounding aluminum block, ensuring that the verticality of each two 90-degree aluminum blocks meets the requirements, and correcting the human assembly error deviation problem during assembly, laying the foundation for the overall assembly accuracy.

[0050] 8) After assembly, tighten the nuts to compress each assembly layer and measure the total height of the basket assembly. If the height is out of tolerance, adjust the assembly height of the parts except the support plate on the top layer to solve the problem of total height tolerance of the basket assembly.

Claims

1. A process for assembling a sealed storage tank basket, characterized by, It comprises the following steps: Step 1: build an assembly platform; Step 2: make a tooling; Step 3: assemble the support plate lifting tooling; Step 4: nested assembly; Step 5: hoist and place; Step 6: positioning and error correction; Step 7: plumb control; Step 8: height revision; The step 1 comprises, Cast iron platform, bottom layer with support plate and equal height block, jack, pressing plate, level to build the assembly reference platform; The step 2 comprises, The tooling is divided into two parts, bottom and top, and is made respectively; The step 2 comprises, The bottom and top of the tooling are placed at the bottom end and top end of the storage sleeve respectively to realize the lifting function, the middle of the tooling is connected by lifting rope, four L-shaped rib plates are welded on the bottom plate of the lifting tooling, the L-shaped rib plates are positioned inside the bottom of the storage sleeve, and the outer dimension of the bottom plate is between the outer side of the storage sleeve and the square hole of the support plate, so that the bottom lifting tooling can meet the requirements of lifting the storage sleeve and passing through the square hole of each layer of support plate; The step 3 comprises, The support plate lifting tooling is assembled by combining the parts support plate, pull rod and nut in the lifting basket, the support plate at the upper end of the tooling serves as the lifting tooling, and the support plate at the lower end of the tooling is the support plate to be assembled; The step 4 comprises, First, the support plate is assembled from top to bottom and inserted into the storage sleeve, when assembling a layer height, the boron aluminum plate and aluminum plate are assembled, and the boron aluminum plate and aluminum plate are placed on the assembly support plate lifting tooling; The step 5 comprises, Slowly lift the support plate lifting tooling to the assembly layer, support the support plate with the jack at the next layer of the periphery of the aluminum block without assembly clearance, then disassemble the nuts at the bottom of the support plate lifting tooling in turn, and finally turn the jack to make the four directions of the support plate fall smoothly to the next layer of the periphery of the aluminum block to ensure the stable placement of the support plate and prevent mutual collision and damage to the surface plating of the support plate; The step 6 comprises, After every 3-5 layers of support plate, aluminum block, aluminum plate, periphery aluminum block and distance tube are assembled, the positioning rod is inserted into the pull rod hole of the assembled aluminum block and support plate to correct the deviation of each layer; The step 7 comprises, During assembly, the level is used to detect the flatness of each layer of support plate, and the side hanging pendant is used to measure the verticality of the side, the hand-operated hoist is used to accurately control the slight correction of the pull rod and the periphery of the aluminum block to ensure that the verticality of every two 90-degree aluminum blocks meets the requirements; The step 8 comprises, After assembly, tighten the nuts to compress each assembly layer and measure the total height of the lifting basket, if the height is out of tolerance, the height direction size of the assembly parts except the support plate on the top layer is reprocessed.

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