Method for repairing gap below tile and filler injection jig

Abstract

To provide a method for repairing a gap below a tile which has a small load on the environment, and enables construction with low noise and low vibration in a short construction period.SOLUTION: A method for repairing a gap below a tile includes: (1) a joint groove formation step of removing a joint material and a substrate material having predetermined lengths along the side face of a tile laid on a floor, from intersection parts of joints of the tile and intersections, and forming a joint groove having a depth substantially the same as the thickness of the tile; (2) a boring step of boring a filler injection hole reaching the substrate layer below the tile, at the intersections; (3) a filler injection jig erection step of erecting a filler injection jig having a filler charge port on the upper end and a filler discharge port on the lower end, on the upper part of the filler injection hole, by inserting the filler discharge port into the filler injection hole; (4) a filler charging step of charging a filler to the filler injection jig from the filler charge port; and (5) a filler filling step of filling the filler into a gap below the tile, through the filler injection hole and the joint groove, from the filler discharge port, by free fall.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for repairing gaps under tiles, which involves filling gaps that occur under tiles laid on a floor with a filler material to repair the gaps, and a filler injection jig used for this method. [Background technology]

[0002] BACKGROUND ART Tile floors, which are floors covered with tiles, have been widely used. In particular, tile floors in buildings with a lot of pedestrian traffic, such as train stations, tend to develop gaps under the tiles as they deteriorate over time, causing the tiles to loosen and crack, making planned repairs necessary.

[0003] There are two methods for renovating tile floors: (1) a replacement method in which the existing tiles are removed and replaced with new tiles, and (2) a cover method in which new floor panels are laid over the existing tiles. Furthermore, an anchor pinning method such as that described in Patent Document 1 is known as a method for repairing a tile wall having tiles laid on the wall surface. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-184554 Summary of the Invention [Problem to be solved by the invention]

[0005] When repairing station tile floors, work must be done at night to avoid disrupting train service, and the work must be completed in as short a time as possible. This is not limited to station buildings, but also to office buildings and other facilities, where the scope of work is limited during business hours, and low-noise, low-vibration construction methods are required. However, the replacement method requires the removal of all existing tiles, which lengthens the construction period and generates noise and vibration, making it unable to meet the above-mentioned requirements. Moreover, the removed tiles and base material become waste, placing a heavy burden on the environment. In this respect, the covering method produces less waste, but floor panels require replacing any loose or cracked tiles before installation, which still generates waste.

[0006] Conventionally, the anchor pinning method used to repair tile walls involves using an injection pump to inject epoxy resin, which is more expensive and has stronger adhesive strength than cement-based fillers, into the area where the wall has become loose. Many tile floors have a base mortar layer. This mortar layer is made of Basa mortar, which has less moisture than regular mortar. Basa mortar is highly permeable, allowing epoxy resin to penetrate, resulting in the use of more epoxy resin than in tile wall renovations, resulting in higher costs. Also, while tiles installed on walls use epoxy resin with high adhesive strength to prevent them from peeling, tiles used on floors do not require such high adhesive strength, and using expensive epoxy resin may be excessive.

[0007] The present invention aims to provide a method for repairing gaps under tiles and a filler injection jig that has a small impact on the environment, can be carried out in a short period of time with little noise and vibration, and can be used for repairing gaps under tiles. [Means for solving the problem]

[0008] The method of repairing gaps under tiles of the present invention, which has been made to achieve the above-mentioned object, includes: (1) a joint groove forming step of removing a predetermined length of joint material and base material from the intersection of the joints of tiles laid on a floor and along the side of the tile from the intersection to form a joint groove of approximately the same depth as the thickness of the tile; (2) a drilling step of drilling a filler injection hole at the intersection that reaches the base layer under the tile; and (3) a filler injection step of drilling a filler material at the upper end of the filler injection hole. The method includes (3) a filler injection jig erection step in which a filler injection jig having an inlet and a filler discharge outlet at its lower end is erected by inserting the filler discharge outlet into the filler injection hole; (4) a filler injection step in which filler is injected into the filler injection jig from the filler inlet; and (5) a filler filling step in which the filler is allowed to fall freely from the filler discharge outlet through the filler injection hole and the joint groove, filling the gap under the tile with the filler. The filler injection jig may be flat and have a base with a joint sealing material on the bottom surface, and in step (3), the filler injection jig may be erected by inserting the joint sealing material of the base into the joint groove. The tile may be rectangular in plan view, and steps (1) to (5) may be performed on the intersections located at the four corners of the tile. The filler injection jig is cylindrical, and after step (5), the method may further include a filler additional filling step (6) of inserting a cylinder having an outer diameter approximately the same as the inner diameter of the filler injection jig through the filler inlet of the filler injection jig, and pressing down the cylinder to fill the filler from the filler discharge port through the filler injection hole and the joint groove into the gap under the tile. The filler may be a cement slurry or a fine cement slurry.

[0009] In addition, the filler injection jig used in the method for repairing gaps under tiles of the present invention consists of a base, a main body, and a support material that supports the main body on the base, the base is disk-shaped with a through hole in the center and a joint sealing material protruding from the bottom, and the main body consists of a cylindrical chamber with an open top, a funnel-shaped collection section provided at the bottom of the chamber, and an approximately cylindrical injection pipe provided at the bottom of the collection section. The height of the joint sealing material projecting from the base of the bottom plate may be less than the thickness of the tile. The injection tube may be configured to be detachable from the main body. A disk-shaped rotary lid having approximately the same diameter as the inside diameter of the filling tube may be provided inside the filling tube so as to be rotatable in the axial direction of the filling tube. The chamber may have an outer diameter that is substantially the same as the inner diameter of the cylinder. The base may have a cross-shaped groove with a T-shaped cross section centered on the through hole on its bottom surface, and the joint sealing material may have a T-shaped fitting portion, the fitting portion of the joint sealing material may be fitted into the groove and protrude from the bottom surface of the base. [Effects of the Invention]

[0010] The present invention can achieve at least one of the following effects by solving the above-mentioned problems. (1) Because there is no need to remove existing tiles or base materials, which was necessary with conventional re-covering and covering methods, large-scale work is not required, and the process can be carried out with fewer steps, in a shorter construction period, with less manpower, and at lower cost. (2) Because there is no need to remove existing tiles or base materials, which was necessary with conventional re-covering and covering methods, less waste is generated and the burden on the environment is smaller. (3) There is little work that generates noise or vibration, and the facility is low in noise and vibration, so construction can be easily carried out while the facility is open. (4) Filling material is filled into the gaps under the tiles from the intersections of the joints at the corners of the tiles, preventing cracks at the corners of the tiles. (5) By filling the gaps under the tiles at the intersections of the joints at the four corners of the rectangular tiles with filler, the filler filled at the bottom of the four corners of the tile supports the entire tile, preventing damage near the center of the tile. (6) By allowing the filler to fall freely within the body of the filler injection jig, ultrafine cement slurry can be smoothly dispensed and filled. (7) By making the protruding height of the joint sealing material from the bottom plate of the base lower than the thickness of the tile, when the joint sealing material is inserted into the joint groove of approximately the same depth as the thickness of the tile and the base is fixed onto the tile, a space is formed below the joint sealing material into which the filler can flow. (8) By making the joint sealing material of the filler injection jig detachable, it can be replaced with a joint sealing material of a size that matches the width of the joint, making it possible to accommodate a variety of sites. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view of a tile floor being repaired using the method for repairing gaps under tiles of the present invention. [Figure 2] Perspective view of the filler injection jig [Figure 3] Perspective view of the base [Figure 4] Perspective view of the base bottom [Figure 5] An exploded perspective view of the main body of the filler injection jig [Figure 6] Cross-sectional view of filler injection jig [Figure 7] Diagram of joint groove [Figure 8] An explanatory diagram of the steps of the method for repairing gaps under tiles according to the present invention (1) [Figure 9] Perspective view of the base fixed [Figure 10] Cross section of foundation and joint groove [Figure 11] Cross-sectional view of the filler injection jig in an upright position [Figure 12] Cross-sectional view of the filler injection jig with filler added [Figure 13] Cross-section of the gap under the tile filled with filler [Figure 14]An explanatory diagram of the state in which a cylinder is inserted into the main body of the filler injection jig DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, the method for repairing gaps under tiles and the filler injection jig of the present invention will be described in detail with reference to the drawings.

[0013] [Example 1] (1) Overview of repair methods for gaps under tiles The method for repairing gaps under tiles of the present invention involves filling gaps V that have developed under tiles T due to deterioration over time in a tile floor where tiles T have been laid out over the floor surface with a filler (Figure 1). The tile floor in this example is made by forming a mortar layer M as a base layer on concrete C, pouring cement paste on top of that as base material B, and then attaching tiles T. Joint material J is filled in the joints between the tiles T.

[0014] (2) Filling material The base mortar layer M is made of basa mortar and has high permeability. For this reason, the filler in this embodiment does not penetrate the base mortar layer M, but penetrates into the narrow gaps V under the tiles T. Therefore, a cement slurry with larger particles than resins such as epoxy resins used in adhesives, preferably ultrafine cement slurry, is used. Ultrafine cement has a small average particle size of cement particles, so it penetrates into the narrow gaps V. In addition, if the base layer is not basa mortar and the base mortar or the main body of the structure has low permeability, a resin-based adhesive such as acrylic resin or epoxy resin can be used as the filler.

[0015] (3) Filler injection jig The filler 1 is filled using a filler injection jig 2 erected on the tile T (FIG. 2). The filler injection jig 2 comprises a base 21 to be placed on the upper surface of the tile T, a main body 22 capable of accommodating the filler 1, and a support member 23 for supporting the main body 22 on the base 21.

[0016] (3.1) Foundation The base 21 is disk-shaped and has a weight and size that allows the main body 22 to stand independently stably via the support member 23 . A through hole 211 is formed in the center of the base 21, and a joint sealing material 212 is provided to protrude from the bottom surface (FIGS. 3 and 4).

[0017] (3.2) Joint sealing material The joint sealing materials 212 are provided to protrude in a cross shape centered on the through-hole 211. The length of each joint sealing material 212 is approximately the same as the radius of the base 21. The joint sealing material 212 is made of rubber, and the base 21 is fixed onto the tile T by inserting the lower penetration portion 212a into the joint groove 3 formed along the tile T. By making the longitudinal side surface of the penetration portion 212a arc-shaped, the base 21 with the joint sealing material 212 attached can be pressed from above, making it easier for the joint sealing material 212 to penetrate into the joint groove 3. The protruding height of the joint sealing material 212 from the bottom surface of the base 21 is lower than the thickness of the tile T, and is preferably about 2 / 3 of the thickness of the tile T. Furthermore, the joint sealing material 212 is fitted into a cross-shaped groove 213 on the bottom surface, the center of which is the through-hole 211, and is provided so as to protrude. In this case, the groove 213 is a T-groove with a T-shaped cross section, and the joint sealing material 212 is provided with a T-shaped fitting portion 212b, which is configured so as to be slid laterally relative to the groove 213 of the base 21 and be detachable. Since the width of the joint varies from site to site, the joint sealing material 212 is made detachable from the base 21, so that it can be replaced with a joint sealing material 212 of a size that matches the width of the joint, making it possible to accommodate a variety of sites.

[0018] (3.3) Main body The main body 22 has a cylindrical chamber 221, a funnel-shaped collecting section 222 provided at the bottom of the chamber 221, and a substantially cylindrical injection tube 223 provided at the bottom of the collecting section 222 (FIG. 5). The top of the chamber 221 is opened as a filler inlet 224. The filler 1 introduced into the chamber 221 from the filler inlet 224 falls freely under its own weight into the collection section 222, and is uniformly guided by the funnel-shaped collection section 222 to the injection pipe 223 at the bottom. Then, the filler 1 guided from the collection section 222 to the injection pipe 223 falls freely due to its own weight, and is discharged from a filler discharge port 225 provided by opening the lower part of the injection pipe 223 . A disk-shaped rotating lid 226 having approximately the same diameter as the inner diameter of the injection pipe 223 is provided inside the injection pipe 223 so as to be rotatable in the axial direction of the injection pipe 223, and is connected to a handle 227 provided outside the injection pipe 223. By rotating the handle 227, the rotating lid 226 can be rotated inside the injection pipe 223, sealing the injection pipe 223 and stopping the discharge of the filler 1, and by rotating the rotating lid 226, the filler 1 inside the injection pipe 223 can be stirred. The lower part of the injection pipe 223 is passed through the through hole 211 in the center of the base 21 and inserted into the filler injection hole 5, which has the same diameter as the joint width and is provided at the intersection 4 of the joint, so its diameter is reduced to match the diameters of the through hole 211 and the filler injection hole 5. In addition, a backflow prevention member 214 having an inner diameter the same as the outer diameter of the injection pipe 223 at the position of the through hole 211 is protruded inside the through hole 211 to prevent the filler 1 from flowing back from below the base 21 to above the through hole 211. Since the diameter of the filler injection hole 5 varies depending on the width of the joint, by configuring the injection pipe 223 to be detachable from the main body 22, it is possible to replace the injection pipe 223 with one having a diameter that matches the width of the joint, making it possible to respond to various sites. In this embodiment, the injection pipe 223 and the collection part 222 are integrated, and the collection part 222 can be detached from the chamber 221 together.

[0019] (3.4) Support material The support material 23 consists of an upper support material 231 arranged along the outer periphery of the chamber 221 of the main body 22, a lower support material 232 arranged on the base 21, and a brace material 233 connecting the upper support material 231 and the lower support material 232. The support material 23 is placed in the center of the base 21, and the main body 22 is inserted from above the upper support material 231, and the support material 23 supports the main body 22 in an upright position relative to the base 21. At this time, a support material stopper tube 215 is erected from the top surface of the base 21 along the outer periphery of the lower support material 232, and the lower support material 232 is housed within the support material stopper tube 215, thereby preventing the support material 23 from moving sideways. However, the configuration of the support material 23 and the support material stopper tube 215 is not limited to the above embodiment, and can be modified as appropriate as long as the configuration can support the main body 22 in an upright position.

[0020] (4) Steps for repairing gaps under tiles Next, the method for repairing gaps under tiles according to the present invention will be described step by step. The tiles T in this example are rectangular in plan view, and the filler 1 is filled at the intersections 4 of the joints at the four corners of the tiles T.

[0021] (4.1) Selection of filler material Beforehand, remove the tiles T in a location that will not interfere with the repair work, and check the specifications of the base layer. Then, for a highly permeable mortar layer, select ultrafine cement slurry as the filler 1, and for a less permeable base mortar or main body, select ultrafine cement slurry or an adhesive such as epoxy resin as the filler 1. In this embodiment, the base mortar layer M is made of basa mortar, and therefore the filler 1 is made of ultrafine particle cement slurry.

[0022] (4.2) Formation of joint grooves The joint material J and base material B are removed from the intersections 4 of the joints at the corners of the tiles T laid on the floor, and from the intersections along the sides of the tiles T, to form cross-shaped joint grooves 3 (Figures 6 and 7(a)). The depth of the joint groove 3 is approximately the same as the thickness of the tile T, and the length from the intersection of the joint groove 3 is longer than the radius of the base 21. The width of the joint groove 3 is the same as the joint width.

[0023] (4.3) Drilling of filler injection holes Filler injection holes 5 are drilled at the intersections 4 of the joints of the tile T (FIG. 7(b)). In the present invention, the filler 1 is filled through the filler injection holes 5 drilled at the intersections 4 of the joints, so there is no need to drill holes in the tile T. By making the diameter of the filler injection hole 5 the same as the joint width, the filler injection hole 5 can be drilled without having to grind the corners of the tile T. The filler injection holes 5 are deep enough to reach the mortar layer M, which is the base layer. After drilling the filler injection holes 5, dust is removed from the joint grooves 3 and the filler injection holes 5. In this invention, the only work that generates noise and vibration is the drilling of the filler injection holes 5 and the formation of the joint trenches 3 (4.2), so the overall noise and vibration levels are low, and construction can be easily carried out while the building is open. Furthermore, because there is no need to remove the existing tiles T or base material B, which was necessary with conventional re-covering and covering methods, large-scale work is not required, and construction can be carried out in a short period of time with little manpower and at low cost. Furthermore, there is little waste generated, which puts a small burden on the environment.

[0024] (4.4) Installation of filler injection jig The base 21 with the joint sealing material 212 provided in the grooves 213 on the bottom surface is placed so that the central through-hole 211 is aligned with the filler injection hole 5 drilled at the joint intersection 4. At this time, the joint sealing material 212 is aligned with the joint grooves 3 formed in a cross shape. Then, the base 21 is pressed downward, and the joint sealing material 212 is inserted into the joint grooves 3 to fix the base 21 onto the tile T (FIGS. 8(c) and 9). At this time, the depth of the joint grooves 3 is approximately the same as the thickness of the tile T, and the protruding height of the joint sealing material 212 from the bottom plate is less than the thickness of the tile T, so a space S is formed below the joint sealing material 212 into which the filler 1 can flow (FIG. 10). In addition, the length of the joint grooves 3 is longer than the radius of the base 21, so joint groove openings 31 are formed between the end of each joint groove 3 and the outer periphery of the base 21. Then, a support material 23 is placed in the center of the top surface of the base 21, the main body 22 is inserted from above the upper support material 231, and the injection pipe 223 is inserted into the through hole 211 of the base 21 and the filler injection hole 5, and the main body 22 is supported upright by the support material 23 (Figure 11). The filler injection jigs 2 may be erected at all of the intersections 4 of the joints at the four corners of the rectangular tile T at the same time.

[0025] (4.5) Adding filler With the rotary lid 226 inside the filler injection jig 2 in a state where the injection tube 223 is sealed, the filler 1 selected in (5.1) is poured into the chamber 221 through the filler inlet 224 at the top of the chamber 221 of the main body 22 (FIG. 12). To prevent the poured filler 1 from drying out, a disk-shaped anti-drying material 11 with a diameter smaller than the inner diameter of the chamber 221 may be placed on the top surface of the filler 1 as a drop lid.

[0026] (4.6) Filling of voids with filler After the filler 1 is placed into the filler injection jig 2, the rotary lid 226 is rotated open, and the filler 1 in the chamber 221 falls freely under its own weight through the collection section 222 at the bottom of the chamber 221 and the injection pipe 223, and is then discharged from the filler discharge port 225 (FIG. 13). If the selected filler 1 is an ultrafine cement slurry, for example, with an injection pump used in anchor pinning, depending on the blend of ultrafine cement and water, dilatancy can make filling difficult, or the fine particles can get caught in the injection pump, making filling difficult. However, in the present invention, the filler 1 is allowed to fall freely, so these phenomena do not occur, and the ultrafine cement slurry can be discharged and filled smoothly. The filler 1 discharged from the filler discharge port 225 flows from the filler injection hole 5 into the space S of the joint groove 3 below the joint sealing material 212 and into the void V below the tile T connected thereto, and spreads from the joint intersection 4 to the surrounding area. Because the top of the joint groove 3 is sealed with the joint sealing material 212, the filler 1 does not overflow from the top of the joint groove 3. Furthermore, because the filler 1 is injected from the joint intersection 4, the filler 1 does not overflow onto the surface of the tile T. When using a plurality of filler injection jigs 2 to inject filler, such as at intersections 4 of joints at the four corners of a rectangular tile T, the filler 1 is injected from the filler injection jig 2 located at a higher gradient.

[0027] When the filler 1 is injected, the filler 1 spreads around and overflows from the joint groove openings 31 at the ends of the joint grooves 3, but the filler 1 overflows first from the joint groove openings 31 of the joint grooves 3 where the gap V under the tile T is small. For this reason, the joint groove openings 31 from which the filler 1 overflowed first are filled with a sealant such as a rag to prevent the filler 1 from overflowing. Once it is confirmed that the filler 1 has overflowed from the four joint groove openings 31 of the cross-shaped joint groove 3, the injection of the filler 1 is complete. If there is not enough filler 1 previously poured into the main body 22, the anti-drying material 11 can be removed and re-injected through the filler inlet 224, eliminating the need to replace the filler injection jig and improving workability. If the filler 1 is not injected by free fall or if overflow from the joint groove opening 31 cannot be confirmed, a cylinder 24 having an outer diameter substantially the same as the inner diameter of the chamber 221 can be inserted into the filler inlet 224 of the main body 22 and the cylinder 24 can be pushed down to apply pressure to the filler 1 to fill it (Fig. 14). However, if too much pressure is applied, ditality will occur in the chamber 221, so injection is performed at low pressure, for example by dropping the cylinder 24 under its own weight or the weight of a weight placed on it. Once the injection of the filler 1 is complete, the main body 22 and the support material 23 are removed from the base 21. The bottom plate is fixed by inserting the joint sealing material 212 into the joint grooves 3, so it can be easily removed by pulling up the bottom plate. After the curing time corresponding to the selected filler material 1 has elapsed, the base 21 is removed from the tile T, and new joint material is filled into the joint grooves 3 and the filler material injection holes 5, completing the work.

[0028] (4.7) Effect of filler injection at joint intersections If there are gaps in the corners of the tiles, cracks are likely to occur due to the load acting on the corners of the tiles. In this embodiment, the filler 1 is filled into the gap V under the tile T from the intersection 4 of the joints at the corners of the tile T, thereby preventing cracks at the corners of the tile T. Furthermore, when these operations are performed at the intersections 4 of the joints at the four corners of a rectangular tile T, the filler 1 filled at the bottom of the four corners of the tile T supports the entire tile T, preventing damage near the center of the tile T. [Explanation of symbols]

[0029] 1 Filler 2 Filler injection jig, 21 Base, 211 Through hole, 212 Joint sealing material, 213 Groove, 214 Backflow prevention material, 215 Support material stopper tube, 22 Main body, 221 Chamber, 222 Collection part, 223 Injection pipe, 224 Filler material inlet, 225 Filler material outlet, 226 Rotating lid, 227 Handle, 23 Support material, 231 Upper support material, 232 Lower support material, 233 Backing material, 24 Cylinder 3 joint groove, 31 joint groove opening 4 intersection 5 Filler injection hole

Claims

1. (1) a joint groove forming process of removing the joint material and base material from the intersections of the joints of tiles laid on the floor and a predetermined length along the side of the tile from the intersections to form joint grooves having a depth approximately equal to the thickness of the tile; (2) a drilling step of drilling a filler injection hole at the intersection, the filler injection hole reaching the base layer below the tile; (3) a filler injection jig erection step of erecting a filler injection jig having a filler inlet at an upper end and a filler discharge outlet at a lower end above the filler injection hole by inserting the filler discharge outlet into the filler injection hole; (4) a filler injection step of injecting a filler into the filler injection jig through the filler inlet; (5) A filler filling step of filling the gaps under the tiles with the filler by allowing the filler to fall freely from the filler discharge port through the filler injection hole and the joint groove. How to repair gaps under tiles.

2. The filler injection jig has a flat base with a joint sealing material provided on the bottom surface thereof, In the step (3), the filler injection jig is erected by penetrating the joint sealing material of the base into the joint groove, The method for repairing gaps under tiles according to claim 1.

3. The tiles are rectangular in plan view, The steps (1) to (5) are performed on the intersections located at the four corners of the tile, respectively. The method for repairing gaps under tiles according to claim 2.

4. The filler injection jig is cylindrical, After the step (5), (6) The method further includes a filler additional filling step of inserting a cylinder having an outer diameter substantially the same as the inner diameter of the filler injection jig from the filler inlet of the filler injection jig, and pushing down the cylinder to fill the filler from the filler discharge port through the filler injection hole and the joint groove into the gap under the tile. The method for repairing gaps under tiles according to claim 3.

5. The filler is a cement slurry or an ultrafine cement slurry. The method for repairing gaps under tiles according to any one of claims 1 to 4.

6. The device comprises a base, a main body, and a support member that supports the main body on the base; The base is disk-shaped, has a through hole in the center, and has a joint sealing material protruding from the bottom surface, The main body comprises a cylindrical chamber having an open top, a funnel-shaped collecting section provided at the bottom of the chamber, and a substantially cylindrical injection tube provided at the bottom of the collecting section. A filler injection jig used in the method for repairing gaps under tiles according to claim 1.

7. The protruding height of the joint sealing material from the base of the bottom plate is lower than the thickness of the tile. The filler injection jig according to claim 6.

8. The injection tube is configured to be detachable from the main body. The filler injection jig according to claim 6.

9. a disk-shaped rotary lid having approximately the same diameter as the inner diameter of the injection tube is provided inside the injection tube so as to be rotatable in the axial direction of the injection tube, The filler injection jig according to claim 6.

10. The chamber has an outer diameter substantially equal to the inner diameter of the cylinder. The filler injection jig according to claim 6.

11. the base has a cross-shaped groove with a T-shaped cross section formed on the bottom surface with the through hole at the center, The joint sealing material has a T-shaped fitting portion, and the fitting portion of the joint sealing material is fitted into the groove and protrudes from the bottom surface of the base. The filler injection jig according to any one of claims 6 to 10.

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