JP5388098B2 - Repair method of structure - Google Patents

Description

  The present invention relates to a method for repairing a structure, and more particularly, to a method for repairing a through hole such as a crack generated in a wall of a building or container that stores a radiation source.

  For example, the walls of structures that store radiation-generating objects (hereinafter referred to as “radiation sources”), such as nuclear power plants, nuclear fuel reprocessing facilities, and medical radiation utilization facilities, are shielded against radiation and seismic. From the viewpoint of securing the property, the wall thickness and strength are determined by law according to the strength of the radiation source (see, for example, Patent Documents 1 and 2). Therefore, it is considered that such a situation that a large crack or the like is generated on the wall of such a structure does not normally occur.

  However, when an unexpected force is applied to the wall, a large crack or the like that penetrates the indoor side wall surface and the outdoor side wall surface of the wall is generated, and the risk of radiation leaking outside from the crack cannot be eliminated. When such a situation occurs, the worker cannot enter the room where the radiation source is stored because there is a risk of exposure to high radioactivity. For this reason, it is necessary for the worker to quickly repair the cracks in the wall only from the outside. Therefore, conventionally, as shown in FIG. 7, measures have been taken to block the cracked outdoor opening with a radiation shielding plate such as a lead plate.

JP 2005-172443 A JP 2003-041661 A

  As shown in FIG. 7, in the method of closing the cracked outdoor opening with the radiation shielding plate, if the outdoor wall surface has a lot of irregularities, the radiation shielding plate installed on the wall surface and the wall surface There is a risk of radiation leaking outside through the gaps between them, and it is difficult to reliably shield the radiation. In addition, when equipment that is difficult to remove is installed in the vicinity of the cracked outdoor opening, the installation space for the radiation shielding plate is limited, and this method cannot be employed.

  In view of the above points, the present invention, when repairing a through-hole such as a crack penetrating the indoor side and the outdoor side of a wall of a structure, reliably and promptly repairs only by work from one side of the wall. The object is to provide a method that can be performed.

A repair method of a structure according to claim 1 of the present invention is a method of repairing a through hole penetrating a wall surface on one side and a wall surface on the other side of a wall constituting the structure, wherein the one side of the through hole After the bag body is inserted into the through-hole from the opening and the mouth portion of the bag body is disposed outside the one side opening , the filler is filled inside the bag body while holding the mouth portion on the outdoor side. And after the filling of the filler is completed, the through hole is closed by closing the mouth portion of the bag body outside the opening on the one side .

  According to a second aspect of the present invention, there is provided a method for repairing a structure according to the first aspect, wherein the bag body is covered with a front end portion of the nozzle filled with the filler, and the nozzle body is covered with the bag body. The filler is discharged from the tip of the nozzle after being inserted into the through hole from one side opening of the through hole.

The structure repair method according to claim 3 of the present invention is characterized in that, in the above-described claim 1 or 2, the filling material filled in the material of the bag body oozes out .

  According to a fourth aspect of the present invention, there is provided a method for repairing a structure according to any one of the first to third aspects, wherein the structure is a building or a container in which a radiation source is stored, and the filling material includes radiation. It is characterized by using a shielding material.

  According to the first and second structure repairing methods of the present invention, when repairing a through-hole penetrating one side and the other side of the wall of the structure, only the work from one side of the wall is performed. The repair work can be performed reliably and promptly. As a result, for example, when the repair method of the present invention is applied to a crack generated on a wall of a building or the like that stores a radiation source, the work can be reliably performed only from the outside, regardless of the surface shape of the outside wall. In addition, radiation can be shielded quickly.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a repair method for first and second structures according to the present invention will be described in detail with reference to the accompanying drawings.

(Repair method for the first structure)
FIG. 1 is a cross-sectional view showing a state in which a crack generated on a wall is repaired by using the first structure repairing method. The wall 1 to be repaired in the present embodiment is a wall of a building or container that stores a radiation source (not shown) such as a nuclear power plant, a nuclear fuel reprocessing facility, or a medical radiation utilization facility. The wall 1 has cracks (through holes) 4 </ b> A that penetrate the indoor side wall surface 2 and the outdoor side wall surface 3 that store the radiation source and extend substantially horizontally in the width direction. In the indoor side wall surface 2 and the outdoor side wall surface 3 of the wall 1, crack openings 5A and 6A (hereinafter referred to as “indoor side opening 5A” and “outdoor side opening 6A”, respectively) are generated. Part S is formed. In addition, the thickness of the wall 1 illustrated in FIG. 1 is assumed to be around 1 m to 2 m, and the vertical length of the space portion S of the crack 4A is assumed to be about 10 cm.

  As described later, the structure repair method according to the present embodiment inserts a flexible bag body 10 into the space S from the outdoor opening 6A of the crack 4A, and then fills the interior of the bag body 10 The material 20 is filled, and after the filling of the filling material 20 is completed, the mouth portion 11 of the bag body 10 is closed on the outdoor side.

  The bag body 10 is made of a flexible material so that no gap is formed between the bag body 10 and the crack 4A when the inside is filled with the filler 20. As the material of the bag body 10, either a water-tight material such as a rubber tube or a material from which the filler 20 filled inside such as a hemp bag oozes may be applied. In addition, when inserting the some bag body 10 in the space part S, it is preferable to use the hemp bag etc. from which the filler 20 oozes as the bag body 10. FIG. In this case, since the filler 20 oozes out and is filled between the adjacent bag bodies 10, more reliable shielding can be performed. The size of the bag 10 is preferably longer than the length of the crack 4A in the wall thickness direction as shown in FIG. 1 in order to facilitate the work from the outdoor side.

  As the filler 20 filled in the bag body 10, a known radiation shielding material 20 having an excellent ability to shield γ rays and neutrons is used (see, for example, JP-A-2003-255081). The radiation shielding material 20 is a gel-like substance obtained by blending a resin raw material having a high hydrogen content, a heavy metal, and a thermal neutron absorber in a predetermined ratio and mixing them. Here, the resin raw material having a high hydrogen content is, for example, a reactive resin raw material (monomer) having a long-chain aliphatic substituent of (meth) acrylic acid. The heavy metal is specifically a compound containing a heavy metal having an atomic number of 22 or more or a heavy metal having an atomic number of 22 or more, such as lead powder (gas atomized powder). The thermal neutron absorber is, for example, boron carbide, boron nitride, or boric acid. The composition of the radiation shielding material 20 described above is merely an example, and a gel-like radiation shielding material 20 having another composition may be used.

  Further, as the radiation shielding material 20, a slightly viscous material such as an uncured mortar or concrete may be used. The mortar and concrete are general mortar and concrete used in normal construction work. Depending on the intensity of the radiation dose from the radiation source, a heavy aggregate having a high density such as metal (sand iron) may be contained as the fine aggregate of mortar and concrete. Further, as the coarse aggregate of concrete, for example, a heavy aggregate having a high density such as iron ore may be included.

  FIGS. 2-1 to 2-4 are diagrams for explaining an example of a procedure for repairing the crack 4A. (A) is a plan sectional view of the crack 4A portion, and (b) is the outdoor portion of the crack 4A. It is the front view seen from (working side). Hereinafter, the procedure of the method of repairing the crack 4A from the outdoor side using the bag body 10 and the filler 20 described above will be described with reference to FIGS. 2-1 to 2-4.

  First, the empty bag 10 is placed on the tip of the filling nozzle 40 that discharges the radiation shielding material 20. Then, as shown in FIG. 2A, the filling nozzle 40 covered with the bag body 10 is inserted into the crack 4 </ b> A so as to dodge the reinforcing bars 7 embedded in the wall 1. As shown in FIG. 2B, when the tip of the filling nozzle 40 reaches the indoor side, the radiation shielding material 20 is discharged from the tip of the filling nozzle 40. When filling the radiation shielding material 20, the filling operation is performed while pressing the mouth 11 of the bag body 10 on the outdoor side so that the bag body 10 is not blown to the indoor side by the momentum of the radiation shielding material 20 discharged from the filling nozzle 40. Do. As shown in FIG. 2-3, the inside of the bag body 10 is filled with the radioactive shielding material 20 until the gap between the crack 4A and the bag body 10 disappears. After the filling is completed, the filling nozzle 40 is extracted from the bag body 10, and the mouth portion 11 of the bag body 10 is bound to the outside as shown in FIG. 2-4. Hereinafter, the bag body 10 filled with the radiation shielding material 20 and the mouth portion 11 being tightly bound will be referred to as a radiation shielding material storage bag 30.

  By repeating the procedure of FIGS. 2-1 to 2-4, the radiation shielding material storage bag 30 is sequentially packed inside the crack 4A, and the crack 4A is closed. Thus, by filling the bag body 10 with the radiation shielding material 20, the radiation shielding material 20 does not fall out into the room during the filling operation of the radiation shielding material 20, and the space portion of the crack 4 </ b> A is surely obtained. S can be filled.

  In the above procedure, the bag body 10 is filled with the radiation shielding material 20 one by one. However, by preparing a plurality of filling nozzles 40, the plurality of bag bodies 10 are shielded against radiation as described below. It is also possible to fill the material 20 at the same time. First, empty bag bodies 10 are respectively placed on the tips of the plurality of filling nozzles 40. And each filling nozzle 40 of the state which covered the bag body 10 is inserted in the crack 4A so that the reinforcing bar 7 embed | buried in the wall 1 may each be dodged. When the tip of each filling nozzle 40 reaches the indoor side, the radiation shielding material is simultaneously discharged from the tip of each filling nozzle 40. While filling the radiation shielding material 20, while holding the mouth 11 of each bag body 10 on the outdoor side so that the bag body 10 is not blown indoors by the momentum of the radiation shielding material 20 discharged from each filling nozzle 40. Perform the filling operation. The radioactive shielding material 20 is filled in each bag 10 until there is no gap between the crack 4 </ b> A and each bag 10. After the filling is completed, each filling nozzle 40 is extracted from each bag body 10, and the mouth portion 11 of each bag body 10 is tightly bound on the outdoor side. By the above procedure, the plurality of radiation shielding material storage bags 30 can be packed into the crack 4A at the same time.

  What is to be repaired in the repair method of the present embodiment is not limited to the crack 4A described above, and can be applied to through holes of any shape that penetrate the indoor side wall surface 2 and the outdoor side wall surface 3. is there. For example, as shown in FIGS. 3-1 to 3-4, the repair method according to the present embodiment can be applied to a case where an old pipe hole after the pipe is replaced is closed. Hereinafter, a procedure for filling the radiation shielding material storage bag 30 in the piping hole 4B will be briefly described.

  First, as shown in FIG. 3-1, an empty bag body 10 is placed on the tip of a filling nozzle 40 that discharges the radiation shielding material 20, and the filling nozzle 40 in a state of covering the bag body 10 is opened from the outdoor opening 6B. Insert into the piping hole 4B. As shown in FIG. 3B, when the tip of the filling nozzle 40 reaches the indoor opening 5B, the radiation shielding material 20 is discharged from the tip of the filling nozzle 40 while holding the mouth 11 of the bag body 10 on the outdoor side. To do. As shown in FIG. 3C, after filling the inside of the bag body 10 with the radioactive shielding material 20 until the gap between the crack 4B and the bag body 10 disappears, the filling nozzle 40 is removed from the bag body 10 and FIG. As shown in -4, the mouth part 11 of the bag 10 is tightly bound on the outdoor side. By performing the above procedure, the radiation shielding material storage bag 30 can be filled in the piping hole 4B, and the piping hole 4B can be closed.

  In FIGS. 3-1 to 3-4, the piping hole 4B is filled with one radiation shielding material storage bag 30 to close the piping hole 4B. However, when the piping hole is large, the above procedure is repeated. Thus, a plurality of radiation shielding material storage bags 30 are packed in the piping hole. For example, as in the example shown in FIG. 4, the four bag bodies 10 are inserted into the piping holes 4 </ b> C, and the radiation shielding material 20 is filled in each bag body 10. Although the piping hole 4C has a rectangular shape, since the bag body 10 has flexibility, the plurality of radiation shielding material storage bags 30 easily adapt to the shape of the piping hole 4C, and the piping hole 4C is surely secured. Can be occluded.

  Further, as shown in the left diagram of FIG. 5, when a plurality of small pipe groups 4a to 4d are accommodated in the pipe sleeve 4D and the gaps around the small pipe groups 4a to 4d are closed, As shown to the right figure of FIG. 5, the several radiation shielding material storage bag 30 is packed in the space | gap part around small piping groups 4a-4d. Specifically, each of the bag bodies 10 is inserted between the pipe sleeve 4D and the small pipe groups 4a to 4d and into the gaps between the small pipe groups 4a to 4d until the adjacent bag bodies 10 are in close contact with each other. The bag body 10 is filled with the radiation shielding material 20. As shown in FIG. 5, the space around the small pipe groups 4 a to 4 d has a complicated shape, but since the bag body 10 is flexible, it easily adapts to the shape of the space and ensures the space. The part can be occluded.

(Second structure repair method)
Next, the repair method of the 2nd structure based on this invention is demonstrated. In addition, about the structure same as the repair method of the 1st structure mentioned above, the same code | symbol is attached | subjected and demonstrated.

  FIG. 6 is a cross-sectional view showing a state in which a crack generated on the wall is repaired by using the second structure repairing method. In the first repair method described above, after inserting the bag body 10 into the space portion S of the crack 4A, the space portion S is closed by filling the bag body 10 with the radiation shielding material 20 (filler material 20). However, in the second repair method, the radiation shielding material 20 is prepared by filling the bag body 10 with the radiation shielding material 20 in advance, and the radiation shielding material storage bag 30 prepared in advance is cracked 4A. This is different from the first repair method in that it is packed in the space portion S.

  A plurality of radiation shielding material storage bags 30 having a size smaller than that used in the first repair method are prepared. Then, as shown in FIG. 6, the radiation shielding material storage bags 30 are sequentially packed in the space S from the outdoor opening 6 so that no gap is generated between the crack 4 </ b> A. Thereby, the radiation shielding material 20 can be reliably filled in the space portion S of the crack 4A without dropping the radiation shielding material 20 into the room. The method shown in FIG. 6 is an example, and the crack 4A may be closed with one radiation shielding material storage bag 30 depending on the size and shape of the crack 4A.

  As described above, according to the above-described repair method of the first and second structures, when repairing the crack 4 generated on the wall 1 of the building or the like that stores the radiation source, Irrespective of the surface shape and the like, radiation can be shielded reliably and promptly only by work from the outdoor side.

  In the first and second structure repair methods described above, the cracks generated in the wall 1 and the example of closing an old pipe hole have been described. However, the objects to be repaired are limited to cracks and pipe holes. The present invention can be applied to through holes of any shape that penetrate the indoor side wall surface 2 and the outdoor side wall surface 3.

  The work using the above-described first and second structure repair methods may be performed using a robot (machine) instead of a human.

  Furthermore, in the above-described first and second structure repair methods, the repair example of the wall 1 of the structure storing the radiation source has been described. However, the structure to be applied in the present invention stores the radiation source. It is not limited to a structure, A general structure is also included. In short, the repair method of the present invention can be effectively applied when it is necessary to perform repair work for closing a through-hole formed in a wall only by work from one side of the wall. In addition, when applying the repair method of this invention to general structures other than the structure which stores a radiation source, the material of the filler 20 selects and uses an appropriate thing according to the kind of structure, etc. .

It is sectional drawing which shows the state which repaired the crack using the repair method of the 1st structure which concerns on this invention. It is a figure which shows an example of the procedure which repairs a crack. It is a figure which shows an example of the procedure which repairs a crack. It is a figure which shows an example of the procedure which repairs a crack. It is a figure which shows an example of the procedure which repairs a crack. It is a figure which shows an example of the procedure which repairs a piping hole. It is a figure which shows an example of the procedure which repairs a piping hole. It is a figure which shows an example of the procedure which repairs a piping hole. It is a figure which shows an example of the procedure which repairs a piping hole. It is a figure which shows the other example of the procedure which repairs a piping hole. It is a figure which shows the other example of the procedure which repairs a piping hole. It is sectional drawing which shows the state which repaired the crack using the repair method of the 2nd structure based on this invention. It is a figure for demonstrating the conventional method of repairing the crack which generate | occur | produced in the building which stores a radiation source.

Explanation of symbols

1 Wall 2 Indoor Side Wall 3 Outdoor Wall 4A Crack (Through Hole)
4B, 4C, 4D Piping hole (through hole)
5A, 5B Indoor side opening (opening on the other side)
6A, 6B Outdoor side opening (one side opening)
7 Reinforcing bars 10 Bag body 11 Mouth 20 Radiation shielding material (filler)
30 Radiation shielding material storage bag (filling material storage bag)
40 Filling nozzle S Space

Claims (4)

A method of repairing a through hole penetrating a wall surface on one side and a wall surface on the other side of a wall constituting a structure,
After the bag body is inserted into the through hole from one side opening of the through hole and the mouth portion of the bag body is arranged outside the one side opening, the bag portion is held while the mouth portion is held on the outdoor side. A structure repairing method, wherein a filler is filled in a body, and the through hole is closed by closing the mouth of the bag body outside the one side opening after the filling of the filler is completed. .   Cover the tip of the nozzle that fills the filler with the bag, insert the nozzle in the state of covering the bag into the through hole from one side opening of the through hole, and then from the tip of the nozzle. The method for repairing a structure according to claim 1, wherein the filler is discharged. The method for repairing a structure according to claim 1 or 2, wherein a material filled in the bag body oozes out . The structure is a building or container that stores a radiation source;
The method for repairing a structure according to any one of claims 1 to 3, wherein a radiation shielding material is used as the filler.

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