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CN-117071925-B - Maintenance method for medical super-thick irregular concrete roof of linear accelerator chamber

CN117071925BCN 117071925 BCN117071925 BCN 117071925BCN-117071925-B

Abstract

The invention provides a maintenance method of a medical super-thick irregular concrete roof of a linear accelerator chamber, which belongs to the technical field of construction of large-volume concrete structures, and the maintenance method comprises the steps that when the roof is poured into tail sounds, a 1.5m thick roof is poured firstly, and at the moment, a 3m thick part of the roof is about to be poured by a hanging die. The 1.5m thick top plate enters a curing stage and needs to be protected. After the casting of the 3m thick top plate is completed, the side surface is different from the top surface, and is maintained by a belt mold. The maintenance takes geotextile moisture preservation and cotton cloth heat preservation as basic methods to form different treatment methods for the positions of different thickness, top surface and hanging mould. The invention ensures that the concrete in different development stages and under different exposure conditions can be cured in place at one time, and avoids concrete cracking.

Inventors

  • LI FENGNAN
  • WANG JIANQING
  • LI LEI
  • YUAN WEI
  • ZHANG XUDONG
  • YANG XIAOYU

Assignees

  • 中建八局第三建设有限公司

Dates

Publication Date
20260505
Application Date
20230801

Claims (6)

  1. 1. The utility model provides a medical linac room super thick irregular concrete roof maintenance method, the structure of concrete roof includes cross 3m thick roof and is located 1.5m thick roof of 3m thick roof below, form wrong platform reentrant angle between 3m thick roof and the 1.5m thick roof, 3m thick roof has external corner and side hang mould position, its characterized in that includes the following step: Step 1, adding geotextile (2) between a hanging die template (5) of a 3m thick top plate and a vertical secondary keel (4) when hanging die construction is carried out on the side surface of the 3m thick top plate, and turning to the step 2; Step2, when the roof is poured into the tail sound, after the large-surface pouring of the roof with the thickness of 1.5m is finished, performing first grouting and plastering on the roof with the thickness of 1.5m, covering a plastic film and spraying water for wetting; step 3, after waiting for 1-1.5 h, the part of the 1.5m thick top plate loses fluidity, and the upper half part of the 3m thick top plate higher than 1.5m is poured, wherein the time for the pouring is 4h; step 4, after the 3m thick top plate is poured completely, performing first slurry collecting and plastering, covering a plastic film and spraying water for wetting the 3m thick top plate, and covering 2cm thick heat-insulating cotton cloth and rainproof plastic cloth until maintenance is finished after spraying water for wetting the side surface hanging die; step 5, lifting the plastic film on the 1.5m thick top plate, performing second grouting and plastering on the 1.5m thick top plate, and covering the plastic film, wherein the outer layer of the plastic film is covered with geotextile again, and then spraying water for wetting; Step 6, after finishing the first grouting and plastering of the 3 m-thick top plate for 6 hours, lifting the plastic film covered on the 3 m-thick top plate, performing second grouting and plastering on the 3 m-thick top plate and covering the plastic film, and at the moment, covering the outer layer of the plastic film with geotextile again, and then spraying water for wetting; step 7, after pouring of the 1.5m thick top plate is completed for 20 hours, lifting the plastic film covered on the 1.5m thick top plate, performing final grouting and plastering on the 1.5m thick top plate, sprinkling water and moisturizing, and sequentially covering a moisturizing geotextile, a plastic cloth with a moisturizing function, a 2cm thick thermal insulation cotton cloth and a rainproof plastic cloth on the top surface; Step 8, after pouring of the 3 m-thick top plate is completed for 20 hours, lifting the plastic film covered on the 3 m-thick top plate, performing third slurry collecting and plastering and watering and moisturizing on the 3 m-thick top plate, and then sequentially covering the 3 m-thick top plate with a moisturizing geotextile, a plastic cloth with a moisturizing function, a2 cm-thick thermal insulation cotton cloth and a rainproof plastic cloth; And 9, after the step 8 is completed for 28 days, the whole maintenance is completed, and the maintenance materials of each layer are removed and the mould is removed.
  2. 2. The maintenance method of the ultra-thick irregular concrete roof of the medical linear accelerator chamber according to claim 1, wherein the maintenance method of the stagger internal angle is characterized in that a double-layer extruded sheet (3) with the size of 200mm multiplied by 60mm is paved at the intersection circle of the position of the stagger internal angle.
  3. 3. The maintenance method of the ultra-thick irregular concrete roof of the medical linear accelerator chamber according to claim 1, wherein the maintenance method of the external corners is characterized in that the peripheries of the heat-insulating cotton cloth with the thickness of 2cm and the rainproof plastic cloth in the step 8 hang down for 0.5m, the external corners are completely wrapped, and the lower openings of the rainproof plastic cloth are fixed by adhesive tapes.
  4. 4. The maintenance method of the ultra-thick irregular concrete roof of the medical linear accelerator chamber according to claim 1, wherein in the step 2, after the 1.5m thick roof is subjected to the first slurry collecting and plastering, the plastic film is covered and the water is sprayed and wetted, a double-layer 15mm thick wood template is paved on the top surface of the 1.5m thick roof.
  5. 5. The maintenance method of the ultra-thick irregular concrete roof of the medical linear accelerator chamber according to claim 1, wherein in the step 3, when the upper half part of the 3m thick roof which is higher than 1.5m is poured, the operation range of personnel and equipment is strictly limited, and the range of the paved double-layer 15mm thick wood template can not be trampled.
  6. 6. The maintenance method of the ultra-thick irregular concrete roof of the medical linear accelerator chamber according to claim 1, wherein in the step 4, the exposed screw is also wrapped by the heat-insulating cotton cloth with the thickness of 2cm and the rainproof plastic cloth, and the screw cannot penetrate through the heat-insulating cotton cloth with the thickness of 2 cm.

Description

Maintenance method for medical super-thick irregular concrete roof of linear accelerator chamber Technical Field The invention relates to the technical field of construction of large-volume concrete structures, in particular to a maintenance method of a medical linear accelerator chamber ultra-thick irregular concrete top plate. Background The medical linear accelerator (MEDICAL LINEAR Accelerators) is a product for radiation therapy of clinical routine X-ray or electron beam, which is composed of a therapeutic head, an accelerating tube, a magnetron/klystron, a collimator, a positioning system, a therapeutic bed, a control system, a modulator, a water cooling unit and the like. Radiation is generated in the operation process of the linear accelerator, so that the machine room where the linear accelerator is arranged needs to be designed into super-thick concrete wallboards. The top plate is 3m thick at the middle cross-shaped protruding part and 1.5m thick at the rest part due to different radiation amounts at different positions, see fig. 1. A large-area moisturizing and heat-preserving mode is adopted for the traditional super-thick top plate aiming at the condition of uneven thickness, and aiming at the condition of larger thickness difference and longer pouring time difference, the special part is lack of targeted maintenance measures. Therefore, how to maintain the concrete top plate with huge thickness difference ensures that the concrete is excellent at one time, avoids radiation leakage caused by defects, and is a problem to be solved at the present stage. Disclosure of Invention The invention aims to provide a curing method for the ultra-thick irregular concrete roof of the medical linear accelerator chamber aiming at the defects of the prior art, which not only can carry out targeted curing aiming at special conditions, but also can define the time nodes of each curing step, and the curing measures are more specific, are more suitable for curing the ultra-thick irregular roof and have popularization value. According to the maintenance method of the medical linear accelerator chamber ultra-thick irregular concrete top plate, the concrete top plate structurally comprises a cross-shaped 3m thick top plate and a 1.5m thick top plate positioned below the 3m thick top plate, a staggered internal corner is formed between the 3m thick top plate and the 1.5m thick top plate, and the 3m thick top plate is provided with an external corner and a side hanging die part, and the maintenance method comprises the following steps: Step 1, adding geotextile (2) between a hanging die template (5) of a 3m thick top plate and a vertical secondary keel (4) when hanging die construction is carried out on the side surface of the 3m thick top plate, and turning to the step 2; Step2, when the roof is poured into the tail sound, after the large-surface pouring of the roof with the thickness of 1.5m is finished, performing first grouting and plastering on the roof with the thickness of 1.5m, covering a plastic film and spraying water for wetting; Step 3, after waiting for 1-1.5 h, at the moment, the 1.5m thick top plate loses part of fluidity, and pouring is started to pour the upper half part of the 3m thick top plate higher than 1.5m, otherwise, slurry leakage at the bottom of the lifting die is easy to occur, and the time is 4h; Step 4, after the 3m thick top plate is poured completely, performing first slurry collecting and plastering, covering a plastic film and spraying water for wetting the 3m thick top plate, and covering 2cm thick heat-insulating cotton cloth and rainproof plastic cloth until maintenance is finished after spraying water for wetting the side hanging die; step 5, lifting the plastic film on the 1.5m thick top plate, performing second grouting and plastering on the 1.5m thick top plate, and covering the plastic film, wherein the outer layer of the plastic film is covered with geotextile again, and then spraying water for wetting; Step 6, after finishing the first grouting and plastering of the 3 m-thick top plate for 6 hours, lifting the plastic film covered on the 3 m-thick top plate, performing second grouting and plastering on the 3 m-thick top plate and covering the plastic film, and covering the outer layer of the plastic film with geotextile again at the moment, and then spraying water for wetting; Step 7, after pouring of the top plate with the thickness of 1.5m is completed for 20 hours, lifting the plastic film covered on the top plate with the thickness of 1.5m, and carrying out final slurry collecting and plastering and water sprinkling and moisturizing on the top plate with the thickness of 1.5 m; Step 8, after pouring of the 3 m-thick top plate is completed for 20 hours, lifting the plastic film covered on the 3 m-thick top plate, performing third grouting and plastering and watering and moisturizing on the 3 m-thick top plate, and then sequentially covering the 3 m-thick top plate with a