JP7664771B2 - Method for cutting sealing member - Google Patents

Description

This disclosure relates to a method for cutting a sealing member.

When laying out pipes, cables, etc. beyond the wall members that make up a structure, penetrations may be provided in the wall members. For example, in nuclear power plant buildings, a sleeve is placed in a penetration hole formed in a wall member, and a sealing member is provided in the gap between the pipes, cables, etc. that pass inside the sleeve, thereby preventing flooding due to tsunamis, etc. Such sealing members are formed by filling them with elastic resins such as polyurethane and silicone rubber.

When such sealing materials deteriorate due to the surrounding environment or aging, maintenance is required to maintain their performance. Maintenance is performed by removing the sealing material and installing a new one. The sealing material can be removed by volume removal using a drill, or by cutting with a blade such as a cutter knife or chisel. For example, Patent Document 1 discloses a technique for a cutting method using a concrete wire saw in which a loop-shaped wire with diamond chips attached is rotated at high speed to scrape off the concrete, although the object to be removed is not the sealing material but the concrete material.

Japanese Patent Application Publication No. 05-185422

Methods such as volume removal using drills or cutting with blades such as cutter knives or chisels are done manually by workers, so they take a lot of time and are inefficient. In addition, the method in Patent Document 1 described above cuts relatively large concrete materials, and the equipment is large in scale because the wire is rotated at high speed, making it difficult to apply to relatively small objects such as sealing members installed in through holes. In addition, the wire is rotated at high speed under tension to come into contact with the object, generating chips and dust.

At least one embodiment of the present disclosure has been made in consideration of the above circumstances, and aims to provide a method for cutting a seal member that can efficiently cut a seal member provided at a penetration portion of a structure.

In order to solve the above problems, a method for cutting a seal member according to at least one embodiment of the present disclosure includes:
A method for cutting a seal member provided at a penetration portion formed in a wall member that divides a first space and a second space adjacent to each other, comprising the steps of:
a through hole forming step of forming a first through hole and a second through hole at different positions of the seal member;
a first wire insertion step of inserting a wire into the first through hole from the first space toward the second space;
a second wire insertion step of further inserting the wire inserted into the first through hole from the second space toward the first space into the second through hole;
a cutting step of applying tension to one end of the wire while fixing the other end of the wire, thereby cutting the seal member;
Equipped with.

At least one embodiment of the present disclosure provides a method for cutting a seal member that can efficiently cut a seal member installed in a penetration portion of a structure.

FIG. 2 is a front view showing the overall configuration of the structure. 2 is a cross-sectional view taken along line AA in FIG. 1. 4 is a flowchart illustrating a method for cutting a seal member according to one embodiment. 4 is a front view showing a through hole formed in the seal member in step S1 of FIG. 3. 5 is a cross-sectional view showing a state in which a wire is inserted into a first through hole of FIG. 4 in step S2 of FIG. 3. 6 is a cross-sectional view showing a state in which a wire is further inserted into the second through hole of FIG. 5 in step S3 of FIG. 3 . 7 is a cross-sectional view showing a state in which the seal member in FIG. 6 is cut in step S4 in FIG. 3. FIG. 4 is a schematic diagram showing one mode in which the tip of the wire is deflected and guided into the second through hole using an insertion jig in step S3 of FIG. 3 . 9 is a diagram showing an example of a detailed configuration of the insertion jig in FIG. 8 . 9 is a diagram showing an example of a detailed configuration of the insertion jig in FIG. 8 . FIG. 4 is a schematic diagram showing another aspect in which the tip of the wire is deflected and guided into the second through hole using an insertion jig in step S3 of FIG. 3 . This is a result of verifying the relationship between the cutting length and the tension required to cut the seal member. 7 is a modified example of the first through hole and the second through hole in FIG. 6 . 13 is a perspective view showing another embodiment regarding the arrangement of through holes in the seal member. FIG. 13B is a perspective view showing a state in which a block is removed from the sealing member cut using the through hole in FIG. 13A. 13B is a cross-sectional view taken along line C, which is a schematic diagram showing how a wire is inserted into the through hole in FIG. 13A to cut the seal member. FIG. 13B is a cross-sectional view taken along line C, which is a schematic diagram showing how a wire is inserted into the through hole in FIG. 13A to cut the seal member. FIG. 13 is a front view showing another embodiment regarding the arrangement of the through holes in the seal member. FIG. This is a modified example of FIG.

Below, several embodiments of the present invention will be described with reference to the attached drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention and are merely illustrative examples.

First, referring to Figure 1, we will explain the structure 1 having the sealing member 2 to be cut. Figure 1 is a front view showing the overall configuration of the structure 1, and Figure 2 is a cross-sectional view taken along line A-A in Figure 1.

The structure 1 has a wall member 6 having a thickness t. The wall member 6 is configured to partition a first space 8 and a second space 10 adjacent to each other, and a through-hole 4 is formed in the wall member 6 to provide a pipe 12 across the first space 8 and the second space 10. The pipe 12 is a pipe member having an internal space 5 through which a fluid can pass. When viewed from the front as shown in FIG. 1, the through-hole 4 is formed in a substantially circular shape having an inner diameter R2 larger than the outer diameter R1 of the pipe 12, thereby securing a gap 14 between the through-hole 4 and the pipe 12, and configured so that the pipe 12 does not directly interfere with the wall member 6 even if thermal expansion displacement occurs due to temperature change. The pipe 12 is arranged concentrically with the through-hole 4.

In this embodiment, the configuration arranged in the penetration portion 4 is exemplified as a pipe 12, but it may be other configurations such as a cable tray or a cable. Furthermore, the shape of the penetration portion 4 is not limited to a substantially circular shape, and may have any shape.

The gap 14 is a path for flooding due to a tsunami, so the gap 14 is filled with the sealing member 2. The sealing member 2 is made of a material that is firmly attached to the inner diameter R2 of the penetration portion 4 and the outer diameter R1 of the pipe 12 so as to prevent water from leaking, and is flexible enough to follow the displacement of the pipe without restraining it, and is tightly filled in the gap 14 to separate the first space 8 and the second space 10 from each other. The sealing member 2 is made of an elastic resin such as silicone rubber or polyurethane, and provides good waterproof performance by preventing water from entering through the gap 14. This configuration is advantageous for preventing flooding due to tsunamis, for example, when applied to a nuclear power plant building.

When such a sealing member 2 deteriorates due to the surrounding environment or aging, maintenance is required to maintain performance. Maintenance is performed by removing the sealing member 2 and installing a new sealing member 2. Removal of the sealing member 2 can be efficiently performed by cutting the sealing member 2 using the cutting method described below.

3 is a flow chart showing a method for cutting the seal member 2 according to one embodiment, FIG. 4 is a front view showing the through holes 20 (first through hole 20A and second through hole 20B) formed in the seal member 2 in step S1 of FIG. 3, FIG. 5 is a cross-sectional view showing the state in which the wire 30 is inserted into the first through hole 20A in FIG. 4 in step S2 of FIG. 3, FIG. 6 is a cross-sectional view showing the state in which the wire 30 is further inserted into the second through hole 20B in FIG. 5 in step S3 of FIG. 3, and FIG. 7 is a cross-sectional view showing the state in which the seal member 2 in FIG. 6 is cut in step S4 of FIG. 3. In the following description, it is assumed that each operation is performed by a worker on one side (first space 8 side) of the wall member 6 when cutting the seal member 2, but it can be more easily applied when a worker is present on the other side (second space 10 side) of the wall member 6.

First, as shown in FIG. 4, a worker forms a through hole 20 in the seal member 2 from one side (the first space 8 side) (step S1: through hole forming process). The through hole 20 is formed in the seal member 2 along the thickness t direction so as to communicate the first space 8 and the second space 10. The through hole 20 is formed using a tool such as a drill. The inner diameter of the through hole 20 is set to be larger than the outer diameter of the wire 30 so that the wire 30 can be inserted in a process described later. Furthermore, since the workload increases as the inner diameter of the through hole 20 becomes larger, by setting the inner diameter small within a range in which the wire 30 can be inserted, the through hole 20 can be formed with less workload.

In step S1, at least a pair of a first through hole 20A and a second through hole 20B are formed as the through holes 20. The first through hole 20A and the second through hole 20B are formed at different positions in the seal member 2. FIG. 4 shows an example of an arrangement layout of the through holes 20 for cutting the seal member 2 and efficiently removing it from the through portion 4 by this method (specifically, when viewed from the front, a plurality of through holes 20 are formed along the circumferential direction on the inner diameter side (second space 10 side) of the seal member 2, and a plurality of through holes 20 are formed along the circumferential direction on the outer diameter side (wall member 6 side) of the seal member 2).

The position of the through hole 20 in the sealing member 2 is not limited to the layout in FIG. 4. The position of the through hole 20 in the sealing member 2 is a factor that directly determines the cutting range of the sealing member 2, and therefore can be set appropriately depending on the cutting range of the sealing member 2.

Then, as shown in FIG. 5, the worker inserts the wire 30 into the first through hole 20A (step S2: first wire insertion step). The wire 30 has an outer diameter smaller than the inner diameter of the first through hole 20A, and is inserted from the first space 8 where the worker is located toward the second space 10 (toward the first direction D1) until the tip 32 of the wire 30 is sufficiently exposed in the second space 10.

As shown in FIG. 6, the worker then further inserts the wire 30 inserted into the first through hole 20A in step S2 into the second through hole 20B (step S3: second wire insertion step). In step S3, the tip 32 of the wire 30, which is exposed in the second space 10 as a result of being inserted into the first through hole 20A in step S2, is deflected and guided into the second through hole 20B, and the wire 30 is inserted from the second space 10 toward the first space 8 (toward the second direction D2) until the tip 32 of the wire 30 is sufficiently exposed in the first space 8.

In addition, in the first wire insertion process (step S2) and the second wire insertion process (step S3), the wire 30 is inserted into the through hole 20 without applying tension to the wire 30 (except for the tension required for the insertion operation).

Now, a specific method for deflecting and guiding the tip 32 of the wire 30 into the second through hole 20B in step S3 will be described with reference to Figures 8 to 10.

Figure 8 is a schematic diagram showing one mode in which the tip 32 of the wire 30 is deflected and guided into the second through hole 20B using an insertion jig 40 in step S3 of Figure 3, and Figures 9A and 9B are diagrams showing an example of the detailed configuration of the insertion jig 40 of Figure 8.

The insertion jig 40 has a main body 42 and an engagement portion 44 provided at the tip of the main body 42. As shown in Figures 9A and 9B, the main body 42 has a first member 42a, a second member 42b, and a third member 42c that extend in the longitudinal direction. The first member 42a and the second member 42b are engaged with each other by a ring 42d so as to be movable along the extension direction, and are connected to the third member 42c via hinges 42e and 42f, respectively.

The insertion jig 40 can be selectively switched between a first form shown in FIG. 9A and a second form shown in FIG. 9B. In the first form, the first member 42a, the second member 42b, and the third member 42c extend in the same direction. On the other hand, in the second form, when the first member 42a is operated by an operator along the extension direction (arrow B in FIG. 9A) in the first form, the third member 42c rotates about the hinges 42e and 42f, and the third member 42c is deflected relative to the first member 42a and the second member 42b (the angle of the third member 42c relative to the first member 42a and the second member 42b can be adjusted by the amount of operation of the first member 42a by the operator).

The engaging portion 44 has a shape that can engage with the tip 32 of the wire 30. In this embodiment, the engaging portion 44 has a hook shape, but the configuration is not limited.

In this method, as shown in FIG. 8, the insertion jig 40 in the first form is inserted into the second through hole 20B. In the first form, the insertion jig 40 has a substantially linear shape as shown in FIG. 9A, so that it can be inserted into the second through hole 20B without interfering with the surroundings. Next, with the engagement portion 44 fully exposed to the second space 10, the insertion jig 40 is switched to the second form. This allows the engagement portion 44 provided at the tip of the insertion jig 40 to be guided to and capture the tip 32 of the wire 30. Thereafter, with the tip 32 of the wire 30 engaged by the engagement portion 44, the insertion jig 40 is returned to the first form again and pulled out from the second through hole 20B. As a result, the wire 30 with the tip 32 engaged by the engagement portion 44 is pulled out into the first space 8.

In FIG. 8, the tip 32 is configured to have a partially larger diameter than the body of the wire 30 in order to make it easier to engage the tip 32 with the engagement portion 44. This prevents the engagement portion 44 from accidentally falling off the tip 32 when the insertion jig 40 is pulled out of the second through hole 20B while the tip 32 is engaged with the engagement portion 44, improving workability.

Figure 10 is a schematic diagram showing another embodiment in which the tip 32 of the wire 30 is deflected and guided to the second through hole 20B using the insertion jig 40 in step S3 of Figure 3. In this embodiment, the insertion jig 40 includes a first member 40A and a second member 40B. A first magnet 46 is attached to the tip 32 of the wire 30 in advance, and the wire 30 is inserted into the first through hole 20A while being guided by the first member 40A. Then, the insertion jig 40 with the second magnet 50 attached to the tip of the main body 40 is inserted into the second through hole 20B, and the second magnet 50 at the tip is engaged with the first magnet 46. In Figure 10, since the first through hole 20A is located above the second through hole 20B, the tip 32 of the wire 30 inserted into the first through hole 20A is deflected vertically downward, so that the first magnet 46 can be well engaged with the second magnet 50.

Even if the first through hole 20A and the second through hole 20B are not in such a positional relationship, for example, by rotating the first member 40A while inserted into the second through hole 20B, centrifugal force can be applied to the tip 32 of the wire 30 held by the first member 40A, and the first magnet 46 can be engaged with the second magnet 50.

By using the insertion tool 40 in this manner, even if the worker in the first space 8 cannot access the second space 10, the wire 30 can be inserted from the first through hole 20A to the second through hole 20B by working from the first space 8.

In the embodiment shown in FIG. 10, the first magnet 46 and the second magnet 50 may be engaged while observing the state of the space 10 using a monitoring device 54 having an imaging probe 52, such as an endoscope, at its tip. In this case, a third through hole 20C is formed as the through hole 20 in the seal member 2, and the state of the space 10 can be properly observed by inserting the imaging probe 52 into the third through hole 20C.

Returning to Fig. 3, the worker then applies tension to one of the tip 32 and the other end 34 of the wire 30 inserted into the first through hole 20A and the second through hole 20B while fixing the other end, thereby cutting the seal member 2 (step S4: cutting process). Fig. 7 shows in stages how the region of the seal member 2 between the first through hole 20A and the second through hole 20B is gradually cut by the tensioned wire 30. When tension is applied to the wire 30, the seal member 2 is gradually cut from the second space 10 side toward the first space 8. After cutting, the wire 30 is taken out to the first space 8 together with the wire stopper 36.
In this embodiment, a case where tension is applied to the tip 32 while the other end 34 is fixed is illustrated, but tension may be applied to the other end 34 while the tip 32 is fixed.

In this embodiment, a wire stopper 36 is attached to the other end 34 of the wire 30 in order to fix the other end 34. The wire stopper 36 is larger than the inner diameter of the through hole 20 into which the wire 30 is inserted, and when tension is applied to the tip 32, the wire stopper 36 interferes with the through hole 20, preventing the wire 30 from slipping out.

Tension may be applied to the tip 32 of the wire 30, for example, by pulling the tip 32 with a winch device or a jack device. In this case, the winch device or the jack device may be fixed in a predetermined position (the wall member 6 or its surrounding structure (not shown)) by, for example, a stand, in order to absorb the reaction force received when tension is applied. These devices may be operated manually or by using a power source such as an electric motor or an engine. For example, when the seal member 2 is made of a relatively soft material, the tension required is relatively small, and from the viewpoint of work reliability and accident prevention, these devices may be operated manually. Furthermore, when the reaction force received when tension is applied is large, a jack device is also effective.

The magnitude of the tension F applied to the wire 30 can be determined based on various parameters such as the cutting length L (the distance between the first through hole 20A and the second through hole 20B), the diameter W of the wire 30, the pulling speed V, and the material properties of the seal member 2. FIG. 11 shows the results of verification of the relationship between the cutting length L and the tension F required to cut the seal member 2. The results show a tendency for the tension required for the wire 30 to increase as the cutting length L increases. In FIG. 11, the upper limit tension that each wire 30 can withstand is shown by a dashed line, and the tension applied to the wire 30 is set within a range that does not exceed these upper limit tensions.

Figure 11 also shows the results of testing multiple wires 30 with different diameters, and shows that the larger the diameter of the wire 30, the greater the tension F required to cut the seal member 2.

Although the thickness H of the sealing member 2 and the inner diameter D of the through hole 20 affect the difficulty of the work, they tend not to have much effect on the magnitude of the tension F.

Here, FIG. 12 shows a modified example of the first through hole 20A and the second through hole 20B of FIG. 6. As shown in FIG. 12, the first through hole 20A and the second through hole 20B may be formed so that the distance between them increases toward the first space 8. In this case, the block cut out by the wire 30 has a shape that expands toward the first space 8 where the worker is present, which has the advantage that the block can be easily removed to the first space 8 side after cutting.

Next, some specific examples of cutting the sealing member 2 will be described. Figure 13A is a perspective view showing another embodiment of the arrangement of the through holes 20 in the sealing member 2, and Figure 13B is a perspective view showing how a block is removed from the sealing member 2 cut using the through holes 20 in Figure 13A.

In this example, as shown in FIG. 13A, four through holes 20 are formed in the sealing member 2. For ease of explanation, these will be distinguished by calling them through holes 20-1, 20-2, 20-3, and 20-4. The through holes 20-1, 20-2, 20-3, and 20-4 are arranged so as to draw a closed loop on the sealing member 2. As described above, the through holes 20 correspond to the cutting range, so by arranging the through holes 20 in this manner, a portion of the sealing member 2 can be cut out as a block (step S5).

Figures 14A and 14B are cross-sectional views of line C that show a schematic diagram of the state in which the wire 30 is inserted into the through-hole 20 in Figure 13A to cut the seal member 2. In this example, as shown in Figure 14A, the wire 30 is inserted into the through-holes 20-1 and 20-3 as the first through-hole 20A and the through-holes 20-2 and 20-4 as the second through-hole 20B. Then, the wire stopper 36 is provided at a position corresponding to the through-hole 20-3 and tension is applied to the wire 30, cutting the seal member 2 between the through-holes 20-3 and 20-4 (area 1 in Figure 14A). Next, the position of the wire stopper 36 is moved to a position corresponding to the through-hole 20-1, and tension is again applied to the wire 30 to cut the seal member 2 between the through-holes 20-1 and 20-2 (area 2 in Figure 14A).

Next, as shown in FIG. 14B, the wire 30 is inserted through the through holes 20-2 and 20-4 as the first through holes 20A, and through holes 20-1 and 20-3 as the second through holes 20B. Then, a wire stopper 36 is provided at a position corresponding to the through hole 20-2 and tension is applied to the wire 30, cutting the seal member 2 between the through holes 20-2 and 20-3 (region 3 in FIG. 14B). Next, the position of the wire stopper 36 is moved to a position corresponding to the through hole 20-4, and tension is again applied to the wire 30, cutting the seal member 2 between the through holes 20-4 and 20-1 (region 4 in FIG. 14B).

In this way, in this embodiment, by repeating the cutting operation while switching the insertion pattern of the wire 30 into the through holes 20 formed in the sealing member 2, it is possible to efficiently cut out a block with a small number of work steps.

Figure 15 is a front view showing another embodiment of the arrangement of the through holes 20 in the seal member 2. In Figure 15, a pair of first through holes 20A and second through holes 20B are arranged at positions facing each other through the pipe 12 arranged in the penetration portion 4 (positions 180 degrees symmetrical with respect to the pipe 12). In this case, the wire 30 is inserted along route A so as to pass through one side of the pipe 12 and tension is applied to perform the first cut, and then the wire 30 is inserted along route B so as to pass through the other side of the pipe 12 and tension is applied to perform the second cut. In this manner, in this embodiment, the number of through holes 20 formed in the seal member 2 is reduced, and the seal member 2 can be removed with a small number of cuts.

Figure 16 is a modified example of Figure 3. The flow chart shown in Figure 16 may further include a sealant remover application step (step S6) in which a sealant remover is applied to the cut surface formed at the penetration portion 4 after the sealant 2 is cut in the cutting step (step S4) and the cut block is removed in the subsequent step S5. In the sealant remover application step, a sealant remover is applied to the cut surface of the remaining sealant 2 when the sealant 2 is cut in the cutting step (step S4) and removed as a block in step S5. This weakens the adhesive force of the sealant remaining on the cut surface to which the sealant remover has been applied, allowing it to be suitably removed (step S7).

The sealant remover applied to the cut surface in the sealant remover application process can be selected based on the material constituting the sealant 2. For example, when the sealant 2 is composed of urethane rubber, the sealant remover can be selected to include at least one of alcohol, ketone, or a polar solvent having nitrogen in its functional group, so that the sealant remaining on the cut surface can be suitably removed. The sealant remover may also be a polar solvent having oxygen in its functional group, or a mixture of a polar solvent having oxygen in its functional group and a polar solvent having nitrogen in its functional group. Examples of polar solvents having oxygen in their functional group include polar solvents having hydroxyl groups (-OH) and polar solvents having carbonyl groups (-C(=O)-). Examples of polar solvents having hydroxyl groups (-OH) include alcohols (R-OH), and more specifically, higher alcohols having 6 or more carbon atoms (R-OH, R is an alkyl group having 6 or more carbon atoms) and methanol (CH3-OH). An example of a polar solvent having a carbonyl group (-C(=O)-) is a ketone (R-C(=O)-R'), more specifically, acetone (CH3-C(=O)-CH3). An example of a polar solvent having nitrogen in its functional group is a polar solvent having an amino group (N-RR') or a polar solvent having a five-membered ring lactam (-CO-NR-) structure. An example of a polar solvent having an amino group (N-RR') is an amine (N-RR'R''). An example of a polar solvent having a five-membered ring lactam (-CO-NR-) structure is methylpyrrolidone (C5H9NO). As such a material, a mixed solvent of an alcohol and a polar solvent having an amino group, or a mixed solvent of an alcohol and a polar solvent having a five-membered ring lactam structure can be used. More specific examples include chemicals containing higher alcohols with six or more carbon atoms and amines (such as MEC-REL N-10 manufactured by NCC), chemicals containing methanol and methylpyrrolidone (such as URESOLVE 411 manufactured by Air Brown), and ketone chemicals (such as acetone).

When the sealing member 2 is made of silicone rubber, the sealing member remover can be selected to contain at least one of organic sulfonic acid, alkyl halide, or alkene halide, so that the sealing member 2 remaining on the cut surface can be suitably removed. More specifically, such materials include chemicals containing organic sulfonic acid and alkyl halide or alkene halide (e.g., e-Solv 21RZ manufactured by Kaneko Chemical Co., Ltd., Silicone Cleaner X-200 and Silicone Cleaner X-300 manufactured by Nissin Chemical Co., Ltd.). Bromine, chlorine, and fluorine are preferred as the type of halogen, and more preferably, the higher the electronegativity (e.g., in the order of fluorine > chlorine > bromine).

As described above, according to each of the above-mentioned embodiments, the seal member 2 can be easily cut by inserting the wire 30 into the first through hole 20A and the second through hole 20B formed in the seal member 2 and applying tension. By repeating such a cutting operation of the seal member, the seal member 2 can be cut out as a block, and the removal operation of the seal member 2 from the penetration portion 4 of the wall member 6 can be efficiently performed.

In addition, the components in the above-described embodiments may be replaced with well-known components as appropriate without departing from the spirit of this disclosure, and the above-described embodiments may be combined as appropriate.

The contents described in each of the above embodiments can be understood, for example, as follows:

(1) A method for cutting a seal member according to one embodiment includes the steps of:
A method for cutting a seal member (e.g., the seal member 2 in the above embodiment) provided in a penetration portion (e.g., the penetration portion 4 in the above embodiment) formed in a wall member (e.g., the wall member 6 in the above embodiment) that divides a first space (e.g., the first space 8 in the above embodiment) and a second space (e.g., the second space 10 in the above embodiment) adjacent to each other, comprising:
a through hole forming step (e.g., step S1 in the above embodiment) of forming a first through hole (e.g., the first through hole 20A in the above embodiment) and a second through hole (e.g., the second through hole 20B in the above embodiment) at different positions of the sealing member;
a first wire insertion step (e.g., step S2 in the above embodiment) of inserting a wire (e.g., the wire 30 in the above embodiment) into the first through hole from the first space toward the second space;
a second wire insertion step (e.g., step S3 in the above embodiment) of further inserting the wire inserted into the first through hole into the second through hole from the second space toward the first space;
a cutting step of cutting the seal member by applying tension to the other end of the wire while fixing one end of the wire (for example, step S4 in the above embodiment);
Equipped with.

According to the above aspect (1), the sealing member can be easily cut by inserting a wire into the first through hole and the second through hole formed in the sealing member and applying tension. By repeating this cutting operation of the sealing member, the sealing member can be cut out as a block, and the removal operation of the sealing member can be performed efficiently.

(2) In another embodiment, in the above embodiment (1),
In the cutting step, a wire stopper (for example, the wire stopper 36 in the above embodiment) is attached to the one end of the wire, thereby fixing the one end to the seal member.

According to the above aspect (2), when tension is applied to the wire to cut it, the wire can be easily fixed by attaching a wire stopper to one end of the wire.

(3) In another aspect, in the above (1) or (2),
In the second wire insertion step,
Inserting an insertion jig (e.g., the insertion jig of the above embodiment) having an engagement portion (e.g., the engagement portion 44 of the above embodiment) at a tip of a main body (e.g., the main body 42 of the above embodiment) from the first space toward the second space,
With the engaging portion engaging the tip of the wire inserted into the first through hole, the wire is inserted into the second through hole by pulling the insertion jig from the second space toward the first space.

According to the above aspect (3), by pulling out the insertion tool from the second through hole while the tip of the wire inserted into the first through hole is engaged by the insertion tool inserted into the second through hole, the wire inserted into the first through hole can be properly guided into the second through hole.

(4) In another embodiment, in the above embodiment (3),
The insertion jig is capable of deflecting the tip, on which the engagement portion is provided, relative to the main body.

According to the above aspect (4), by deflecting the engagement portion provided at the tip of the insertion jig, the tip of the wire inserted into the first through hole can be easily engaged with the engagement portion at the tip of the wire in the second space.

(5) In another embodiment, in the above embodiment (3),
The engaging portion includes a second magnet (eg, the second magnet 50 in the above embodiment) that can engage with a first magnet (eg, the first magnet 46 in the above embodiment) attached to the tip of the wire.

According to the above aspect (5), the second magnet provided at the tip of the insertion jig is attracted to the first magnet provided at the tip of the wire, so that the tip of the wire inserted into the first through hole can be easily engaged with the engagement portion of the tip of the wire in the second space.

(6) In another aspect, in any one of the above (1) to (5),
In the cutting step, the tension is applied using a winch or jack device.

According to the above aspect (6), tension can be appropriately applied to the wire during the cutting process by using a winch or jack device.

(7) In another aspect, in any one of the above (1) to (6),
The first through hole and the second through hole are formed such that the distance between them increases toward the first space.

According to the above aspect (7), the distance between the first through hole and the second through hole is formed so that the distance between them increases toward the first space. In this case, the block cut out by the wire has a shape that expands toward the first space where the worker is present, so that the block can be easily removed to the first space side after cutting.

(8) In another aspect, in any one of the above (1) to (7),
An insertion member (e.g., the piping 12 in the above embodiment) is disposed in the through-hole across the first space and the second space,
The sealing member is configured to seal a gap (eg, gap 14 in the above embodiment) that exists between the insert member and the wall member.

According to the above aspect (8), the sealing member that seals the gap between the penetrating member and the wall member arranged in the penetration portion can be suitably cut.

(9) In another aspect, in the above (8),
In the through hole forming step, the first through hole and the second through hole are formed at positions opposing each other with the penetrating member interposed therebetween.

According to the above aspect (9), by forming the first through hole and the second through hole at positions facing each other via the penetrating member, the sealing member can be cut efficiently with a small number of steps.

(10) In another aspect, in any one of the above (1) to (9),
The method further includes a sealant remover applying step of applying a sealant remover to a cut surface formed at the penetration portion by cutting the sealant in the cutting step.

According to the above aspect (10), by applying a sealant remover to the cut surface formed by removing the sealant in the cutting process, the sealant remaining on the cut surface can be suitably removed.

(11) In another embodiment, in the above embodiment (10),
The seal member remover includes at least one of an alcohol, a ketone, or a polar solvent having a nitrogen in its functional group.

According to the above aspect (11), by using a seal member remover containing such a material, it is possible to effectively remove a seal member made of, for example, urethane rubber.

(12) In another aspect, in the above (10) or (11),
The seal member remover includes at least one of an organic sulfonic acid, an alkyl halide, or an alkene halide.

According to the above aspect (12), by using a seal member remover containing such a material, it is possible to effectively remove a seal member made of, for example, silicone rubber.

(13) In another aspect, in any one of the above (1) to (12),
The wall member constitutes a building of a nuclear power plant.

According to (13) above, it is possible to suitably cut the sealing member provided at the penetration part of the wall member constituting the nuclear power plant building to prevent flooding due to a tsunami or the like.

Reference Signs List 1 Structure 2 Sealing member 4 Through portion 5 Internal space 6 Wall member 8 First space 10 Second space 12 Pipe 14 Gap 20 Through hole 20A First through hole 20B Second through hole 30 Wire 32 Tip 36 Wire stopper 40 Insertion jig 42 Main body 42a First member 42b Second member 42c Third member 42d Ring 42e Hinge 44 Engagement portion 46 First magnet 50 Second magnet

Claims (13)

A method for cutting a seal member provided at a penetration portion formed in a wall member that divides a first space and a second space adjacent to each other, comprising the steps of:
a through hole forming step of forming a first through hole and a second through hole at different positions of the seal member;
a first wire insertion step of inserting a wire into the first through hole from the first space toward the second space;
a second wire insertion step of further inserting the wire inserted into the first through hole from the second space toward the first space into the second through hole;
a cutting step of applying tension to one end of the wire while fixing the other end of the wire, thereby cutting the seal member;
A method for cutting a seal member comprising: The method for cutting a seal member according to claim 1, wherein in the cutting step, a wire stopper is attached to the one end of the wire to fix the one end to the seal member. In the second wire insertion step,
inserting an insertion jig having an engagement portion at a tip of a body from the first space toward the second space;
3. The method for cutting a sealing member according to claim 1 or 2, wherein the wire is inserted into the second through hole by pulling the insertion jig from the second space toward the first space while the engaging portion engages the tip of the wire inserted into the first through hole. The method for cutting a seal member according to claim 3, wherein the tip of the insertion jig on which the engagement portion is provided can be deflected relative to the main body. The method for cutting a seal member according to claim 3, wherein the engaging portion includes a second magnet that can engage with a first magnet attached to the tip of the wire. The method for cutting a sealing member according to any one of claims 1 to 5, wherein the tension is applied using a winch device or a jack device in the cutting process. The method for cutting a sealing member according to any one of claims 1 to 6, wherein the first through hole and the second through hole are formed so that the distance between them increases toward the first space. an insertion member is disposed in the through portion across the first space and the second space,
The method of claim 1 , wherein the seal member is configured to seal a gap that exists between the insert member and the wall member. The method for cutting a sealing member according to claim 8 , wherein in the through hole forming step, the first through hole and the second through hole are formed at positions opposing each other with the through portion interposed therebetween. The method for cutting a seal member according to any one of claims 1 to 9, further comprising a seal member remover application step of applying a seal member remover to a cut surface formed in the penetration portion by cutting the seal member in the cutting step. The method for cutting a seal member according to claim 10, wherein the seal member remover includes at least one of an alcohol, a ketone, or a polar solvent having nitrogen in its functional group. The method for cutting a seal member according to claim 10 or 11, wherein the seal member remover contains at least one of an organic sulfonic acid, an alkyl halide, or an alkene halide. The method for cutting a seal member according to any one of claims 1 to 12, wherein the wall member constitutes a building of a nuclear power plant.

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