Method for installing a high-level solidification mass storage well

Abstract

The application belongs to the installation method, and particularly relates to a kind of installation method of group high radioactive solidification body storage well equipment. It includes: group storage well equipment installation adopts segmented installation, through positioning steel plate installation→storage well bottom plate installation→penetrating piece installation→penetrating piece pouring→well hole hoisting→well hole installation acceptance→well hole and penetrating piece on-site welding→after secondary grouting step, the whole combination forms group storage well equipment group, realizes the function. The remarkable effect of the application is: effectively avoids well hole hoisting deformation; ensures that displacement phenomenon does not appear in pouring process; prevents heavy concrete pouring displacement.

Description

TECHNICAL FIELD

[0001] The present application belongs to the installation method, and particularly relates to an installation method of a group type high-radioactivity solidified body storage well equipment. BACKGROUND

[0002] With the first batch of reactors serving the end of life, the nuclear facility decommissioning problem is increasingly concerned by all parties, and our country also increases the reactor decommissioning budget investment, and the problem to be solved is the treatment of the decommissioned nuclear facilities. There are a large amount of high-level liquid waste to be disposed in the domestic nuclear facility decommissioning disposal construction project. In the high-level liquid waste disposal process, there are many technical difficulties in the installation process of the glass solidified body temporary storage device, the large-scale pre-embedded installation of the storage well penetrating part and the support, the displacement and deformation caused by the heavy concrete pouring are prevented; the lateral force of the top of the storage well shaft needs to be balanced, and the compensator at the lower part of the storage room top plate penetrating part cannot support the lateral force, so the shaft must be inserted into the top plate penetrating part, so that the shaft and the penetrating part partially overlap, forming a directional support to balance the lateral force; in the installation process, in order to ensure the balance of the lateral force, the control difficulty of the large-scale shaft hoisting precision is great, and the overall leveling and alignment of the storage well shaft through the base and the storage room bottom plate is difficult to realize. The installation leveling and alignment of the storage well, the large-scale equipment overall pre-embedded installation in the limited area, the large-scale equipment pre-embedded installation overall heavy concrete pouring in the limited area, and the large-scale hoisting precision control of the cylinder equipment in the limited area become the restriction points in the construction process. SUMMARY

[0003] The present application is directed to the defects of the prior art, and provides an installation method of a group type high-radioactivity solidified body storage well equipment.

[0004] The present application is implemented as follows: an installation method of a group type high-radioactivity solidified body storage well equipment, including the following contents,

[0005] The group type storage well equipment installation adopts segmented installation, and after the positioning steel plate installation, the storage well bottom plate installation, the penetrating part installation, the penetrating part pouring, the shaft hoisting, the shaft installation acceptance, the shaft and the penetrating part on-site welding, and the secondary grouting steps, the group type storage well equipment group is formed by overall combination, and the predetermined function is realized.

[0006] The installation method of the group type high-radioactivity solidified body storage well equipment as described above, wherein the following steps are included,

[0007] Step S1, when the through-penetrating member is marked and positioned on the positioning steel plate, at least four longitudinal and transverse center lines of the through-penetrating member are marked on the top plate of each room according to the longitudinal and transverse reference lines provided by the civil engineering, then the center point of the storage well bottom plate is guided to the upper part of the positioning steel plate by using a laser plumb instrument, and whether the center of the storage well bottom plate is consistent with the installation center line of the through-penetrating member is checked. If there is deviation, the deviation of the longitudinal and transverse reference lines of the through-penetrating member is calculated based on the center of the storage well bottom plate, and the deviation value is compensated when the hole position of the positioning steel plate is marked, so as to ensure that the through-penetrating member is consistent with the center of the storage well bottom plate. After the marking is completed, the positioning steel plate is holed, and the cutting excess is welded with a lug for use as a hole protection plug.

[0008] Step S2, the storage well bottom plate is installed on the anchor bolt after the structure pre-embedded member is pre-embedded. The storage well bottom plate has a square structure and is provided with an installation hole penetrating through the anchor bolt. A nut is arranged at the upper and lower positions of the installation hole, and an optical combined level instrument (accuracy 0.01 mm) is used for accurate measurement, the storage well bottom plate is adjusted up and down by rotating the lower nut, and after the adjustment is completed, the upper nut is tightened. The installation of the storage well bottom plate should be carried out after the surface of the structure pre-embedded member is cleaned and the acceptance is qualified. When the storage well bottom plate is installed, initial leveling and alignment are first carried out, and then precise leveling and alignment are carried out after the shaft hoisting is completed.

[0009] Step S3, the penetration piece is an internal cylindrical structure, and the outer side is provided with a bellows, a positioning flange, a truss support flange, and a feed port in sequence from bottom to top. The penetration piece is hoisted into place after the room positioning steel plate is handed over and passed the review and acceptance. When the penetration piece is installed, the positioning flange on it is seated on the positioning steel plate. The penetration piece of each room ceiling is installed by first adjusting it one by one in the horizontal direction, and then adjusting it row by row in the longitudinal direction. After the installation and acceptance of the previous row of penetration pieces are passed, the next row can be constructed. After the penetration pieces are in place and leveled and aligned one by one, the positioning flanges and the positioning steel plates are spot-welded and fixed one by one, and then the positioning truss is installed. The welding position of the penetration piece and the positioning steel plate is located on the side of the positioning flange, and only sealing welding is performed. The welds need to be 100% penetrated and inspected according to the corresponding standards, and the level I rating is qualified. After the installation and spot welding of the penetration piece is completed, a plumb bob is used in conjunction with a steel ruler to select the longest section of the same diameter with high manufacturing precision in the direction of 90 degrees to each other for plumbness measurement. The plumbness is re-measured during and after the welding process. The verticality change of the penetration piece is calculated by measuring the elevation change value in the direction of 90 degrees to each other during and after the installation of the positioning truss. The plumbness adjustment must be made for any deviation that exceeds the design allowable deviation requirement. After the welding is completed, a bellows is passed under the positioning steel plate. The bellows is required to be in good condition to effectively prevent damage to the equipment caused by vibration. The positioning truss is a frame-type structure as a whole. The penetration piece is fixed by the positioning truss as a whole, and the overall leveling and alignment of the penetration piece is carried out. After the installation of each row of positioning trusses, the overall leveling and alignment of each group is carried out. Finally, the penetration piece and the positioning steel plate are sealed and welded and inspected. The penetration piece and the positioning truss are installed row by row. The positioning truss is installed below the feed port of the penetration piece, and the bottom is supported by the truss support flange. The upper part is welded to the side wall of the feed port.

[0010] Step S4: The welded penetration piece and the positioning steel plate are reinforced by the positioning truss to form a local enclosed space. After the enclosed space is reinforced with steel bars, a secondary concrete pouring is performed. After the pouring is completed, the height of the concrete is kept flush with the lower edge of the feed opening of the penetration piece.

[0011] Step S5, the guide cone is installed at the bottom of the wellbore before hoisting, which is connected to the bottom of the wellbore through the bolt inside the guide cone, and the guide cone has a chamfer, which can effectively make the wellbore pass through the lower corrugated pipe of the through-penetration part, and ensure the hoisting accuracy of the wellbore. The wellbore hoisting adopts double-machine lifting method, the lifting end uses tower crane to connect with the reserved ear hole of the wellbore through the pole beam, and the tail end of the wellbore uses the automobile crane to buckle the wellbore through the clamping ring, so as to avoid the deformation of the wellbore during hoisting. When the wellbore is hoisted by using the method, the tower crane and the automobile crane are operated synchronously, the wellbore is lifted gradually, then the automobile crane stops, the tower crane rises, the wellbore is turned from the horizontal state to the vertical state, the state of the hoisted object is checked, the clamping ring is removed under the condition of no abnormal situation. The wellbore is slowly installed into the through-penetration part in the vertical state, 2 inverted chains are symmetrically hung at a height of 3 meters from the ground and connected with the wellbore, the wellbore is stably lowered to the installation floor, and the interval of the wellbore and the lower ring of the through-penetration part is adjusted to be consistent.

[0012] Step S6, the wellbore and the through-penetration part are adjusted to have equal gap between the wellbore and the corrugated pipe section in the equipment room penetrated by the through-penetration part, and are fixed by spot welding, then the measuring clamp is installed at the lower part of the corrugated pipe section in the equipment room penetrated by the through-penetration part, then 1 hoisting line drop is arranged at the position of 90 degrees with the cylinder wall by using the measuring clamp, two points on the vertical plane of the storage well are selected as effective measuring points, the position of the wellbore is adjusted to level and align the wellbore. After the wellbore is leveled and aligned and is spot welded with the bottom plate of the storage well, the wellbore and the through-penetration part are welded and leveled and aligned.

[0013] Step S7, the wellbore and the through-piece are welded and detected in sequence. The wellbore and the through-piece in each room are welded and detected in sequence along the transverse direction and then in sequence along the longitudinal direction. After the wellbore and the through-piece in the previous row are welded, detected and accepted, the wellbore and the through-piece in the next row can be welded. In order to ensure that the gap between the wellbore and the through-piece is uniformly distributed, four-point positioning (3 / 6 / 9 / 12 o'clock positions) is used when positioning welding to reduce the uneven distribution of the gap caused by manufacturing tolerances, and the positioning spot welding length is 15-20 mm. The wellbore and the through-piece are welded. A welding top support device is installed on the upper part of the storage well first, a radial support force is added inside the weld area to reduce welding deformation, and the working surface of the lower end welding top support mechanism is the weld position of the wellbore and the through-piece. In order to prevent shrinkage and displacement during the welding process of the wellbore and the through-piece, the welding top support device is removed after the weld cools to room temperature. The welding top support device comprises a guide plate, a variable diameter wheel and at least two support plates; the variable diameter wheel is located at the center of the guide plate and can rotate reciprocally about the axis of the guide plate relative to the guide plate; the support plates are symmetrically distributed in the circumferential direction on the guide plate and can move reciprocally in the radial direction of the guide plate; the support plates are fan-shaped plates, wherein the outer edge of the support plate is a circular arc surface and extends outward beyond the outer edge of the guide plate in the radial direction, and the inner edge of the support plate is a flat surface and contacts the outer edge of the variable diameter wheel; the outer edge of the circular arc surface gradually increases in length by rotating the variable diameter wheel, forming an opening and closing mechanism. After the spot welding of the wellbore installation point is completed, a measuring clamp is installed on the corrugated pipe near the positioning steel plate of the wellbore, and a hanging line drop (weight 5 Kg) is hung at a position 90 degrees away from the measuring clamp. Three measuring points are set at equal intervals along the length of the storage well to measure the verticality of the storage well. After each layer of weld is welded during the wellbore welding process, it is re-measured.

[0014] Step S8, after the wellbore and the through-piece and the storage well bottom plate are all welded, the installation accuracy is re-measured to see if it meets the standard, and after the sample test is passed, the concrete is poured again to the edge of the storage well bottom plate.

[0015] The method for installing a group high radioactive solidified body storage well device as described above, wherein the method comprises the following steps: in step S1, a hole protection plug is made by cutting the excess material of the positioning steel plate and welding the lug, which effectively saves the production material and improves the secondary utilization rate of the material. The hole protection effect is good, and the hole protection plug placed is only left with a small notch between the original cutting hole, which can be easily taken out and can completely cover the hole to achieve the protection effect.

[0016] The method for installing a group high radioactive solidified body storage well device as described above, wherein the method comprises the following steps: in step S1, a hole protection plug is made by cutting the excess material of the positioning steel plate and welding the lug, which effectively saves the production material and improves the secondary utilization rate of the material. The hole protection effect is good, and the hole protection plug placed is only left with a small notch between the original cutting hole, which can be easily taken out and can completely cover the hole to achieve the protection effect.

[0017] The method for installing a group high radioactive solidified body storage well device as described above, wherein the method comprises the following steps: in step S2, the storage well bottom plate is placed after being cleaned by using the structure pre-embedded part and the anchor bolt which have been completed in advance, and a nut is arranged at the upper and lower positions of the anchor bolt passing through the storage well bottom plate, so that the anchor bolt and the nut can be effectively used to adjust the size to uniformly level the plurality of storage well bottom plates. The leveled storage well bottom plate has a uniform installation reference, which ensures the overall accuracy during the device installation process.

[0018] The method for installing a group high radioactive solidized body storage well device as described above, wherein the method comprises the following steps: in step S3, the installation and fixation of the penetrating part are performed by using the combined positioning function of the positioning steel plate and the positioning truss. The positioning steel plate forms a penetrating part installation reference surface, and the pre-fabricated positioning steel plate unified reference surface provides a unified penetrating part installation reference in a wide range. The combined structure of the positioning truss is used to uniformly level and fix the plurality of penetrating parts as a whole, which ensures the overall installation accuracy.

[0019] The installation method of the population type high radioactivity solidified body storage well equipment as described above, wherein the following steps are included, in step S5, the guide cone with chamfer is used to assist the smooth insertion of the penetrating member in the cylinder installation process. The double machine lifting method is adopted, the upper end is lifted by the flat beam and the clamp, two lifting points are used for lifting, the well cylinder is rotated in the space direction to change the horizontal direction into the vertical direction, and the deformation of the storage well cylinder in the turning process is ensured. The movable detachable clamp and the guide cone are used to improve the reuse rate of the tool.

[0020] The installation method of the population type high radioactivity solidified body storage well equipment as described above, wherein the following steps are included, in step S6, the measuring clamp is installed at the bottom of the penetrating member, and the plumb line is hung to the bottom of the well cylinder, so that the measurement and the overall leveling and alignment can be effectively assisted.

[0021] The installation method of the population type high radioactivity solidified body storage well equipment as described above, wherein the following steps are included, in step S7, the welding deformation prevention jacking device is used, which is provided with an opening and closing mechanism, the opening and closing form is controlled, the well cylinder and the penetrating member being welded are effectively jacked, and the welding deformation is controlled. The device is opened during the welding process, the welding seam being welded is jacked, and the device is closed and taken out after the welding seam is cooled.

[0022] The significant effect of the present application is that a large-scale equipment overall pre-burying installation overall leveling and alignment method in a restricted area is developed for installation of a storage well, a large-scale equipment overall pre-burying installation anti-heavy concrete pouring displacement and deformation method in a restricted area, a large-scale hoisting precision control method of a cylinder equipment in a restricted area, and a large-scale installation overall leveling and alignment method of a cylinder equipment in a restricted area. For storage well top plate through-penetrating piece marking and positioning, at least four longitudinal and transverse center lines of the through-penetrating piece are marked on the top plate of each room according to longitudinal and transverse reference lines, then the center point of the storage well bottom plate structure pre-burying piece is guided to the upper part of the positioning steel plate by using a laser plumb instrument, and whether the center of the pre-burying piece is consistent with the installation center line of the through-penetrating piece is checked, so that the measurement accuracy is ensured. For storage well well hole hoisting, a well hole hoisting pole balance beam and a clamp are developed, a double-machine lifting method is used during hoisting, a tower crane and a well hole pre-reserved lifting lug hole are connected through the pole balance beam at a lifting end, a car hoist and the well hole are connected through a clamp at a tail end for hoisting and transporting, and hoisting deformation of the well hole is effectively avoided. A pole beam is used for connecting the main lifting hook and the well hole, and a clamp is used for connecting the auxiliary lifting hook and the well hole, so that deformation of the well hole caused by stress during hoisting is effectively prevented. For welding of the well hole and the through-penetrating piece, a special top support device for welding of the well hole and the through-penetrating piece is developed as a measure for preventing shrinkage deformation and displacement of the well hole and the through-penetrating piece during welding, an upper end support mechanism is fixed on the through-penetrating piece to prevent displacement, a lower end top support mechanism working surface is the position of the well hole and the through-penetrating piece welding seam, a radial top support force top support device is added inside the welding seam area, and welding deformation is reduced. For installation of the storage well through-penetrating piece, a positioning steel plate is installed at the top of each equipment room as a through-penetrating piece installation base and a displacement fixing measure, after completion of leveling and alignment of the through-penetrating piece, the through-penetrating piece bottom flange and the positioning steel plate are sealed and welded to ensure that no displacement occurs during pouring. For heavy concrete pouring of the storage well through-penetrating piece, a heavy concrete pouring displacement positioning truss is developed, after completion of welding of the through-penetrating piece and the positioning steel plate, a welding positioning truss is installed and welded between the through-penetrating pieces at the top of each equipment room as a measure for ensuring the verticality of the through-penetrating piece during pouring. After completion of installation of each row of trusses, overall leveling and alignment of each group is performed, the through-penetrating pieces and the positioning trusses are installed row by row, and the verticality of the through-penetrating pieces is monitored, finally, each row of trusses is welded to form a whole, and heavy concrete pouring displacement is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 a storage well structure diagram of the present application;

[0024] Figure 2 a positioning steel plate cutting and protection device diagram of the present application;

[0025] Figure 3 a foot bolt and storage well bottom plate connection diagram of the present application;

[0026] Figure 4This is a schematic diagram of the overall leveling and alignment of the positioning steel plate and the positioning truss fastened in the present invention;

[0027] Figure 5 This is a schematic diagram of the installation of the guide cone of the present invention;

[0028] Figure 6 This is a schematic diagram of the installation of the double-machine lifting method of the present invention;

[0029] Figure 7 This is a schematic diagram of the hoisting and positioning of the wellbore of the present invention;

[0030] Figure 8 This is a schematic diagram of leveling and aligning the measuring clamp of the present invention;

[0031] Figure 9 Schematic diagram of the welding anti-deformation support device of the present invention;

[0032] Figure 10 This is a schematic diagram of the support device for welding anti-deformation according to the present invention;

[0033] Figure 11 It is a schematic diagram of the card holding device of the present invention. DETAILED DESCRIPTION

[0034] Below, combined with the attached Figures 1-8 , the installation method of the group-type high-radioactive solidified body storage well equipment described in the present invention is described in detail.

[0035] like Figure 1 and Figure 2 As shown, the positioning steel plate 1 is located above the corrugated pipe of the penetration piece 2. During installation, the penetration piece 2 passes vertically through the pre-opened hole 1-1 of the positioning steel plate 1, using the positioning steel plate 1 as a positioning reference. When marking and positioning the penetration piece 2 on the positioning steel plate 1, first mark the longitudinal and transverse center lines 1-2 of at least four penetration pieces on the ceiling of each room based on the longitudinal and transverse reference lines provided by the civil engineering. Then, use the laser plumb line 3 to guide the center point of the embedded structural parts of the storage well floor 4 to the top of the positioning steel plate 1 to verify whether the storage well floor 4 is consistent with the installation center line of the penetration piece 2. If there is a deviation, it is necessary to use the storage well floor 4 as a reference to calculate the deviation of the longitudinal and transverse center lines 1-2 of the penetration piece, and compensate for the deviation value when marking the pre-opened hole 1-1 of the positioning steel plate 1 to ensure that the center of the penetration piece 2 is consistent with the center of the storage well floor 4. After marking, the positioning steel plate 1 is drilled. After drilling, the cut material is welded to the hanging ears 1-3, which are used as hole protection plugs 1-4.

[0036] like Figure 1 and Figure 3As shown, the storage well bottom plate 4 is installed on the anchor bolt 5-1 which is embedded by the structural embedded part 5. The storage well bottom plate 4 is in square structure and has an installation hole 4-1 passing through the anchor bolt 5-1. A nut is arranged at the upper and lower positions of the installation hole 4-1. The accurate measurement is performed by using an optical combined level (accuracy 0.01mm). The storage well bottom plate 4 is adjusted in the up and down directions by rotating the lower nut 5-3. After the adjustment is completed, the upper nut 5-2 is tightened. The installation of the storage well bottom plate 4 should be performed after the surface of the structural embedded part 5 is cleaned and the acceptance is passed. The installation of the storage well bottom plate 4 is firstly performed by initial leveling and alignment. After the shaft 7 is hoisted, the accurate leveling and alignment are performed.

[0037] As shown in Figure 1 and Figure 4 The through part 2 is in internal cylindrical structure. The outside is sequentially provided with a corrugated pipe, a positioning flange, a truss support flange and a feeding port from bottom to top. After the through part 2 is hoisted to the positioning steel plate 1 and is in position, the positioning steel plate 1 is handed over and is rechecked and accepted. The installation of the through part 2 is performed after the handing over and acceptance. During the installation of the through part 2, the positioning flange is seated on the positioning steel plate 1. The installation of the through part 2 of each room roof is firstly adjusted in position along the transverse direction, then is adjusted in position along the longitudinal direction. After the installation and acceptance of the previous row of through parts are completed, the next row of construction can be performed. After the adjustment in position and leveling of the through part 2 is completed, the positioning flange and the positioning steel plate 1 are fixed by spot welding. Then, the positioning truss 6 is installed. The welding position of the through part 2 and the positioning steel plate 1 is located at the side of the positioning flange. Only the seal welding is performed. The welding seam needs to be 100% penetrated for inspection according to the corresponding standard. The I level is accepted as qualified. After the spot welding of the through part 2 is completed, the plumbness is measured by using a drop line combined with a steel ruler which is in the direction of 90 degrees with each other. The plumbness is re-measured during and after the welding. The plumbness change of the through part is calculated by measuring the elevation change value in the direction of 90 degrees with each other during and after the installation of the positioning truss 6. The plumbness adjustment is re-performed if the change exceeds the design allowable deviation. After the welding is completed, the corrugated pipe passes through below the positioning steel plate 1. The corrugated pipe needs to be in good condition to effectively prevent the damage of the equipment caused by vibration. The positioning truss 6 is in frame structure. The through part 2 is fixed by the positioning truss 6. The leveling and alignment of the through part 2 are performed. After the installation of each row of positioning trusses 6 is completed, the whole leveling and alignment of each group are performed. Finally, the seal welding and acceptance of the through part 2 and the positioning steel plate 1 are performed. The installation of the through part 2 and the positioning truss 6 is performed row by row. The installation position of the positioning truss 6 is below the feeding port of the through part 2. The bottom is supported by the truss support flange. The upper part is welded on the side wall of the feeding port. The through part 2 and the positioning steel plate 1 which are welded are reinforced by the positioning truss 6. The local sealed space is formed. The concrete is secondarily poured after the reinforcement by the steel bars in the sealed space. The concrete height is kept flush with the lower edge of the feeding port of the through part 2 after the pouring is completed.

[0038] As Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 11 shown, the guide cone 8 is installed at the bottom of the wellbore 7 before hoisting, connected to the bottom of the wellbore 7 through the bolt 8-1 inside the guide cone 8, and has a chamfer 8-2 on the guide cone 8, which can effectively make the wellbore 7 pass through the lower corrugated pipe of the through-penetration piece 2 smoothly and ensure the hoisting accuracy of the wellbore 7. The wellbore 7 is hoisted by double-machine lifting method, the tower crane 9 is connected to the reserved ear hole of the wellbore 7 through the flat beam 10 at the hoisting end, and the automobile crane 11 is connected to the wellbore 7 through the clamp 12 at the tail end 7-2 of the wellbore, to avoid deformation of the wellbore 7 during hoisting. When hoisting using this method, the tower crane 9 and the automobile crane 11 operate synchronously, the wellbore 7 is gradually lifted, then the automobile 11 stops hoisting, the tower crane 9 rises, the wellbore 7 is turned from a horizontal state to a vertical state, the state of the hoisted object is checked, and the clamp 12 is removed under the condition of no abnormality. The wellbore 7 is slowly loaded into the through-penetration piece 2 in the vertical state, two inverted chains 13 are symmetrically hung at a height of 3 meters from the ground and connected to the bottom of the wellbore 7, the wellbore 7 is stably lowered onto the storage well bottom plate 4, and the interval between the wellbore 7 and the lower opening of the through-penetration piece 2 is adjusted to be consistent.

[0039] As Figure 1 and Figure 8 shown, the wellbore 7 and the corrugated pipe of the through-penetration piece 2 are adjusted to have equal gaps and are fixed by spot welding, a measuring clamp 14 is installed at the lower part of the corrugated pipe of the through-penetration piece 2, one hoisting line drop is arranged at each position 90 degrees apart on the wall of the wellbore 7, two points on the vertical plane of the storage well are selected as effective measurement points, the position of the wellbore 7 is adjusted through the storage well bottom plate 4 under the wellbore 7, and the wellbore 7 is leveled and aligned.

[0040] As Figure 1 , Figure 9 and Figure 10As shown, the wellbore 7 and the through-piece 2 are welded and detected in sequence with the through-piece 2 installation sequence. The wellbore 7 and the through-piece 2 in each room are welded and detected, first along the transverse direction one by one, and then along the longitudinal direction row by row. After the last row of wellbore 7 and the through-piece 2 are welded, detected and accepted, the next row of construction can be carried out. In order to ensure uniform distribution of the gap between the wellbore 7 and the through-piece 2, four-point positioning (3 / 6 / 9 / 12 o'clock positions) is used during positioning welding to reduce the uneven distribution of the gap caused by manufacturing tolerances, and the positioning spot welding length is 15-20 mm. The wellbore 7 and the through-piece 2 are welded, a welding top support device 15 is first installed on the upper part of the storage well, a radial support force is added inside the weld area to reduce welding deformation, and the working surface of the lower end welding support mechanism is the weld position of the wellbore 7 and the through-piece 2. In order to prevent shrinkage and displacement during the welding process of the wellbore and the through-piece, the welding top support device 15 is removed after the weld cools to room temperature. The welding top support device 15 includes a guide plate 15-1, a variable diameter wheel 15-2 and at least two support plates 15-3; the variable diameter wheel 15-2 is located at the center of the guide plate 15-1 and can rotate relative to the guide plate 15-1 about the axis of the guide plate 15-1; the support plates 15-3 are symmetrically distributed in the circumferential direction on the guide plate 15-1 and can move reciprocally in the radial direction of the guide plate 15-1; the support plates 15-3 are sector plates, wherein the outer edge of the support plate 15-3 is a circular arc surface and extends radially beyond the outer edge of the guide plate 15-1, and the inner edge of the support plate 15-3 is a flat surface and contacts the outer edge of the variable diameter wheel 15-2; by rotating the variable diameter wheel 15-2, the outer edge of the circular arc surface gradually increases in length, forming an opening and closing mechanism. After the spot welding of the wellbore 7 installation point is completed, a measuring clamp 14 is installed on the corrugated pipe near the positioning steel plate 1 of the wellbore 7, and a hanging line drop (weight 5 Kg) is hung at a position 90 degrees from the measuring clamp 14, and three measuring points are set at equal intervals along the length of the storage well to measure the verticality of the storage well. During the welding process of the wellbore, each layer of weld is re-measured after welding.

Claims

1. A method for installing a group-type highly radioactive solidified body storage well device, characterized by: Including the following content, The installation of group storage well equipment adopts segmented installation. After the steps of positioning steel plate installation → storage well bottom plate installation → penetration piece installation → penetration piece casting → well shaft hoisting → well shaft installation acceptance → well shaft and penetration piece on-site welding → secondary grouting, the whole is assembled to form a group storage well equipment group to achieve the established function. The penetration piece is an internal cylindrical structure, with a bellows, a positioning flange, a truss support flange, and a feed port arranged on the outside in order from bottom to top. The penetration piece is hoisted into place after the room positioning steel plate is handed over and passed the review and acceptance. When the penetration piece is installed, the positioning flange on it sits on the positioning steel plate. The penetration pieces of each room ceiling are installed by first adjusting them one by one in the horizontal direction, and then adjusting them row by row in the vertical direction. The next row can only be constructed after the previous row of penetration pieces has been installed and passed the acceptance. Adjust the gap between the wellbore and the bellows section where the penetration piece enters the equipment room to an equal gap and spot weld them to fix them. Then install a measuring clamp at the lower part of the bellows section where the penetration piece enters the equipment room. Then use the measuring clamp to set a plumb bob at 90 degrees to each other on the wall of the wellbore. Select any two points on the plumb plane of the storage well as valid measuring points. Adjust the position of the wellbore through the storage well bottom plate at the lower part of the wellbore to level and align the wellbore. The wellbore is welded to the through-piece, and a welding support device is first installed on the upper part of the storage well, and the welding support device includes a guide plate, a variable diameter wheel and at least two support plates; the variable diameter wheel is located at the center of the guide plate, and can reciprocate around the axis of the guide plate relative to the guide plate; the support plates are symmetrically distributed on the guide plate along the circumferential direction, and can reciprocate along the radial direction of the guide plate; the support plate is a fan-shaped plate, wherein the outer edge of the support plate is a circular arc surface and extends radially outward from the outer edge of the guide plate, and the inner edge of the support plate is a plane and contacts the outer edge of the variable diameter wheel; through the rotation of the variable diameter wheel, the circular arc surface of the outer edge gradually grows outward to form an opening and closing mechanism.

2. The method for installing a group-type highly radioactive solidified body storage well device according to claim 1, characterized in that: The following steps are included: Step S1: When marking and positioning the penetration piece on the positioning steel plate, first mark the longitudinal and transverse center lines of at least four penetration pieces on the ceiling of each room according to the longitudinal and transverse reference lines provided by the civil engineering department. Then, use a laser plumb line to guide the center point of the storage well floor to the upper part of the positioning steel plate, and verify whether the center of the storage well floor is consistent with the installation center line of the penetration piece. If there is a deviation, the deviation of the longitudinal and transverse reference lines of the penetration piece is calculated based on the center of the storage well floor, and the deviation value is compensated when marking the position of the pre-drilled hole on the positioning steel plate to ensure that the center of the penetration piece is consistent with the center of the storage well floor. After the marking is completed, the positioning steel plate is drilled. After the drilling is completed, the cut excess is welded to the hanging lug to be used as a hole protection plug. Step S2: Install the storage well bottom plate on the anchor bolts pre-embedded in the structural embedded parts. The storage well bottom plate has a square structure and is provided with mounting holes through which the anchor bolts pass. A nut is provided at the upper and lower positions of the mounting holes. An optical coincidence level with an accuracy of 0.01 mm is used for precise measurement. The storage well bottom plate is leveled up and down by rotating the lower nut. After leveling is completed, the upper nut is tightened. The installation of the storage well bottom plate should be carried out after the surface of the structural embedded parts has been cleaned and passed acceptance. When installing the storage well bottom plate, preliminary leveling and alignment should be carried out first, and fine leveling and alignment should be carried out after the wellbore is hoisted. Step S3, after the penetration pieces are in place and leveled and aligned one by one, the positioning flanges and positioning steel plates are spot-welded and fixed one by one, and then the positioning truss is installed; the welding position of the penetration piece and the positioning steel plate is located on the side of the positioning flange, and only sealing welding is performed. The welds need to be 100% penetrated and inspected according to the corresponding standards, and grade I is rated as qualified; after the penetration piece is installed and spot-welded, a plumb line is used with a steel ruler to select the longest section of the same diameter with high manufacturing precision at 90 degrees to each other for plumbness measurement, and the plumbness is re-measured during and after the welding process. During and after the installation of the positioning truss, the plumbness of the penetration piece is calculated by measuring the elevation change value at 90 degrees to each other. Changes, for those that exceed the design allowable deviation requirements, the plumbness must be readjusted; after the welding is completed, a bellows is passed under the positioning steel plate. The bellows is required to be in good condition to effectively prevent damage to the equipment caused by vibration; the positioning truss is a frame structure as a whole, and the through-piece is fixed by the positioning truss as a whole, and the through-piece is leveled and aligned as a whole; after the installation of each row of positioning trusses is completed, the overall leveling and alignment of each group is carried out, and finally the through-piece and the positioning steel plate are sealed and welded and accepted, and the through-piece and positioning truss are installed row by row; the positioning truss is installed below the feed port of the through-piece, and the bottom is supported by the truss support flange, and the upper part is welded to the side wall of the feed port; Step S4: The welded penetration piece and the positioning steel plate are reinforced by the positioning truss to form a local enclosed space; after the enclosed space is reinforced with steel bars, concrete is poured a second time, and after the pouring is completed, the height of the concrete is kept flush with the lower edge of the feed port of the penetration piece; Step S5, before hoisting the wellbore, a guide cone is installed at the bottom of the wellbore, and is connected to the bottom of the wellbore by bolts inside the guide cone. The guide cone has a chamfer, which can effectively make the wellbore pass through the corrugated pipe at the lower part of the penetration piece smoothly, so as to ensure the hoisting accuracy of the wellbore; the wellbore hoisting adopts a double-machine lifting method, the lifting end uses a tower crane to connect with the reserved ear hole of the wellbore through a shoulder beam, and the tail end of the wellbore uses a car crane to buckle the wellbore through a clamping ring to avoid deformation of the wellbore hoisting; when using the method, the tower crane and the car crane work synchronously to lift the wellbore step by step, and then the car crane stops, the tower crane rises, and the wellbore is flipped from a horizontal state to a vertical state, the state of the hoisted object is checked, and the clamp is removed if there is no abnormality; the wellbore is slowly loaded into the penetration piece in the vertical state, and when it is 3 meters above the ground, two fall chains are symmetrically hung and connected to the wellbore, and the wellbore is smoothly dropped to the installation floor, and the circumferential spacing between the wellbore and the lower opening of the penetration piece is adjusted to be consistent; Step S6: After the wellbore is leveled and aligned and spot-welded with the storage well bottom plate, the wellbore and the penetration piece are welded and the whole is leveled and aligned; Step S7: The welding and inspection sequence of the shaft and the penetration piece is the same as the installation sequence of the penetration piece. The welding and inspection of the shaft and the penetration piece in each room are first carried out one by one in the horizontal direction, and then row by row in the vertical direction. The construction of the next row can only be carried out after the previous row of shafts and penetration pieces have been welded, inspected and accepted. To ensure that the gap between the shaft and the penetration piece is evenly distributed, four-point positioning is adopted during tack welding, at the 3 / 6 / 9 / 12 o'clock positions, to reduce the uneven distribution of the gap caused by manufacturing tolerances. The tack welding length is 15 to 20 mm. A radial supporting force is added inside the weld area to reduce welding deformation. The working surface of the lower end welding supporting mechanism is the weld position between the wellbore and the through-piece to prevent shrinkage deformation and displacement during the welding process of the wellbore and the through-piece. The welding supporting device is removed after the weld cools to room temperature. After the wellbore installation spot welding is completed, a measuring clamp is installed on the corrugated pipe of the wellbore close to the positioning steel plate, and a pendant with a weight of 5 kg is hung at a 90-degree position. Three measuring points are set at equidistant positions along the entire length of the storage well to measure the verticality of the entire length of the storage well. During the shaft welding process, each layer of weld is retested after completion; Step S8: After the wellbore, the penetration piece and the storage well bottom plate are welded, the installation accuracy is retested to see if it meets the standard, and after the sample test is carried out and no problem is found, the concrete is poured to the edge of the storage well bottom plate for the second time; The method comprises the following steps: when adopting the hoisting method proposed by the present invention to install group-type high-radioactive solidified body storage well equipment, the existing conditions on site are utilized, and the storage well installation is carried out in the form of segmented hoisting and complete assembly; the installation, measurement and welding are carried out simultaneously to reduce error accumulation and improve installation accuracy; the combined stable structure of positioning steel plates and positioning trusses is adopted to effectively avoid the influence of secondary concrete pouring on the accuracy of the penetration parts during the installation process of the penetration parts; the end guide cone is used to avoid collision during the hoisting of the wellbore, and the application of the double-machine lifting method avoids damage and deformation of the cylinder body, effectively ensuring the realization of installation accuracy; the welding support device in the welding process utilizes its unique internal support form to avoid the problem of welding deformation of the penetration parts and the cylinder body; the installation method and auxiliary work of the group-type high-radioactive solidified body storage well equipment provided by the present method effectively improve the hoisting quality and hoisting safety; The method comprises the following steps: in step S1, the remaining material of the hole cut from the positioning steel plate is welded to the hole protection plug after the hanging ear is welded, which effectively saves the production materials and improves the secondary utilization rate of the materials; the hole protection effect of the cut hole is good, and only a small incision is left between the placed hole protection plug and the original cut hole, which is convenient for removal and can completely cover the hole to achieve the protection effect; The method comprises the following steps: in step S2, using pre-made structural embedded parts and anchor bolts, the storage well bottom plate is cleaned and placed, and a nut is provided at the upper and lower positions of the storage well bottom plate where the anchor bolts are passed, so that the large-size adjustment function of the anchor bolts and nuts can be effectively utilized to uniformly level multiple storage well bottom plates. After leveling, the storage well bottom plates have a unified installation reference, thereby ensuring the overall accuracy of the equipment installation process; The method comprises the following steps: in step S3, the through-pieces are installed and fixed by using the combined positioning function of the positioning steel plate and the positioning truss; the positioning steel plate forms a reference surface for the installation of the through-pieces; the prefabricated positioning steel plate is used to unify the reference surface, thereby providing a unified reference surface for the installation of the through-pieces over a large area; the combined structure of the positioning truss is used to level and fix the multiple through-pieces as a whole, thereby ensuring their overall installation accuracy; The method comprises the following steps: in step S5, a guide cone with a chamfered corner is used to assist in smoothly inserting the penetration piece during the installation of the cylinder; a double-machine lifting method is adopted, and the upper end is lifted by two lifting points, a shoulder beam and a clamp, and the shaft is rotated in the spatial direction to change the shaft from a horizontal direction to a vertical direction, thereby ensuring that the storage shaft body does not deform during the turning process; a movable and detachable clamp and guide cone are used to improve the reuse rate of the tooling; The following steps are included: in step S6, a measuring clamp is installed at the bottom of the penetration piece, and a plumb line is hung to the bottom of the wellbore, which can effectively measure and assist in overall leveling and alignment; The method includes the following steps: in step S7, a welding anti-deformation support device is used, which has an opening and closing mechanism. By controlling the opening and closing form, the wellbore and the through-piece being welded can be effectively tightened to control welding deformation; when the welding process is in progress, the device is opened to tighten the weld being welded, and the device is closed and taken out after the weld cools down.

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