Mold connection body

Abstract

To provide a mold connection body, which covers an inner wall of a manhole from inside of the inner wall so as to leave a filling space between the inner wall and the mold connection body, and has a first end and a second end that are connected to each other, and can achieve sufficient tensile strength even at a bonded part.SOLUTION: A mold connection body covers an inner wall M4F of a manhole from inside of the inner wall M4F so as to leave a filling space S between the inner wall M4F and the mold connection body, and has a first end 22 and a second end 15 that are connected to each other. The first end 22 and the second end 15 overlap each other, and the overlapping parts are bonded with resin. A resin carrying structure 30 for carrying resin is provided on the first end 22.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a mold connecting body having a first end portion and a second end portion that are connected to each other and cover the inner wall of a manhole from the inside while leaving a filling space between the inner wall and the mold connecting body.

Background Art

[0002] Manholes are generally made of concrete, and the inner wall surface may be corroded by hydrogen sulfide generated in underground pipes, especially sewer pipes, over a long period of time. In addition, cracks may occur on the inner wall surface of manholes buried in roadways due to vehicle vibrations. Furthermore, the strength of manholes may decrease due to aging deterioration. In these cases, repair of the manhole is required.

[0003] However, due to traffic conditions and to keep repair costs down, it is difficult to repair manholes by excavation.

[0004] Therefore, as a method of repairing a manhole using a non-excavation repair material (hereinafter referred to as a mold), an arc-shaped mold is inserted into the manhole from the opening of the manhole entrance in a reduced diameter state, the mold is expanded in diameter, and one circumferential end portion and the other end portion of the mold are joined together to form a cylindrical shape. A filler is filled between the outer peripheral surface of the cylindrical mold and the inner peripheral wall of the manhole, and the filler is cured so that the inner peripheral surface of the mold becomes a new inner peripheral wall of the manhole (see, for example, Patent Document 1). Patent Document 1 describes that when joining one circumferential end portion and the other end portion of the mold, the one end portion and the other end portion are overlapped, and the overlapped portion is adhered with resin.

[0005] In addition, there are cases where molds divided into a plurality of parts are joined together. In this case as well, it is necessary to overlap the molds and adhere the overlapped portion with resin.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, when attempting to bond the overlapping portions with resin, the resin runs off, making it impossible to achieve sufficient bonding and resulting in a significant reduction in the tensile strength of the bonded portion.

[0008] In view of the above circumstances, an object of the present invention is to provide a molded connector that can obtain sufficient tensile strength even at the bonded portion.

Means for Solving the Problems

[0009] The molded connector of the present invention for solving the above object is a molded connector having a first end portion and a second end portion that are connected to each other and cover the inner wall of a manhole from the inside while leaving a filling space between them and the inner wall, the first end portion and the second end portion overlap each other, and the overlapping portion is bonded with resin, and the first end portion is provided with a resin-supporting structure for supporting the resin.

[0010] According to the molded connector of the present invention, at the overlapping portion, the resin is likely to stay due to the resin-supporting structure provided at the first end portion, and the first end portion and the second end portion are bonded by the retained resin, so that sufficient tensile strength can be obtained even at the bonded portion. In addition, since the resin is less likely to run off, the sealing property is also improved, and it is possible to prevent hydrogen sulfide from entering.

[0011] Note that the inner wall may be a peripheral wall or a ceiling wall.

[0012] Further, the resin support structure may be a structure (pebbled structure) in which a recess is provided on the surface of the first end portion facing the second end portion, or a structure in which jagged grooves are provided. Further, the first end portion may be entirely provided with the resin support structure.

[0013] Further, the first end portion and the second end portion may be the end portions on one side and the other side of a common mold. That is, the mold connection body is formed by connecting both end portions in the circumferential direction of a single arc-shaped mold, the first end portion is one end portion in the circumferential direction of the arc-shaped mold, and the second end portion may be the other end portion in the circumferential direction of the arc-shaped mold. Alternatively, the first end portion and the second end portion may be the end portions of different molds.

[0014] Also, The resin may be characterized in that it is a resin resistant to hydrogen sulfide.

[0015] It is preferable that both the first end portion and the second end portion are made of a material resistant to hydrogen sulfide. Also, the resin and the material may be of the same component. For example, both may be mainly composed of a vinyl ester resin.

[0016] Also, The resin support structure is a structure in which a resin support having a first surface located on the first end portion side and a second surface located on the second end portion side is fixed to the first end portion. The resin support may be characterized in that it is provided with a communication space connecting the first surface to the second surface.

[0017] Note that the resin support may be attached to the surface of the first end portion facing the second end portion.

[0018] Further, the mold connector may be arranged vertically, and the resin carrier may extend in the vertical direction of the mold connector. Alternatively, the mold connector may be arranged horizontally, and the resin carrier may extend in the horizontal direction of the mold connector.

[0019] Further, the communication space is not limited to a linear shape and may have a complex shape.

[0020] Also, a first mold, and a second mold, wherein the first mold and the second mold are connected, the first end portion is an end portion of the first mold on the second mold side, and the second end portion may be an end portion of the second mold on the first mold side.

[0021] That is, the present invention can also be applied when connecting different molds together.

Advantages of the Invention

[0022] According to the present invention, it is possible to provide a mold connector capable of obtaining sufficient tensile strength even at an adhesive portion.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

BEST MODE FOR CARRYING OUT THE INVENTION

[0024] Embodiments of the present invention will be described below with reference to the drawings.

[0025] FIG. 1 is a view showing an example of a manhole to be repaired.

[0026] A manhole is an entrance for a person to inspect an underground structure where people cannot normally enter or exit, and is an embedded concrete molded body. Some manholes are made by placing concrete on site, while others have a structure in which assembled types manufactured in a factory are stacked. FIG. 1 shows an example of the latter. Also, the manhole shown in FIG. 1 is for a sewer.

[0027] FIG. 1(A) is a perspective view schematically showing the manhole, and FIG. 1(B) shows a cross-sectional view seen from the side of the manhole. In FIG. 1(A), the left front side of the figure is the front side, and the right rear side is the rear side. Also, in FIG. 1(B), the left side of the figure is the front side, and the right side is the rear side.

[0028] As shown in FIG. 1(A), the manhole M of the present embodiment has a circular opening at the entrance Mi, and a slanted wall portion M2 installed via a height adjustment member M1 below the entrance Mi and a straight wall portion M3 connected to the lower side of the slanted wall portion M2 also have a circular horizontal cross-section. On the other hand, the rectangular portion M4 connected to the lower side of the straight wall portion M3 has a square horizontal cross-section.

[0029] The inner diameter IL of the entrance of the manhole M is 600 mm, while the lateral inner dimension XL of the rectangular part M4 is 2000 mm, and the longitudinal inner dimension YL is also 2000 mm. Note that the inner diameter is enlarged by the inclined wall part M2, and the inner diameter DL of the straight wall part M3 is 900 mm. Also, in this Figure 1(A), a flat mold 1 that covers the inner wall of the rectangular part M4 from the inside while leaving a filling space between it and the inner wall is represented by a two-dot chain line. On the vertical walls (front wall M4F, right side wall M4R, etc.) of the rectangular part M4, a flat mold 1 with a width of 650 mm and a mold piece 2 for width adjustment are shown. Also, on the ceiling wall (top plate Mt) of the rectangular part M4, a flat mold 6 with a width of 350 mm and a mold piece 7 for width adjustment are shown. The installation of each flat mold and the like will be described later.

[0030] Figure 1(B) shows an openable lid MC that closes the opening of the entrance of the manhole M, a receiving frame MR that receives the lid MC, a height adjustment member M1, an inclined wall part M2, and a straight wall part M3. Also shown is a rectangular part M4 that connects to the lower part of the straight wall part M3. On the inclined wall part M2, the straight wall part M3, and the rectangular part M4, lifting brackets SP are attached to the inner peripheral wall on the back side.

[0031] The height adjustment member M1 is a member for adjusting the surface of the lid MC to the height position of the ground, and can be mortar for adjustment, a ready-made adjustment ring, or a concrete ring cast on the construction site. The receiving frame MR is installed on the height adjustment member M1.

[0032] The inclined wall part M2 is made of concrete manufactured in a factory. As shown in Figure 1(B), this inclined wall part M2 is inclined radially outward downward over the entire circumference.

[0033] The straight wall part M3 is also made of concrete manufactured in a factory. This straight wall part M3 is cylindrical, and here, straight wall bodies M30 with different heights are stacked in two layers. Note that there are straight wall bodies M30 with various heights.

[0034] The rectangular part M4 is composed of a top plate Mt, a side wall body Ms, and a pipe attachment wall body Ma.

[0035] The top plate Mt is a horizontal plate made of concrete manufactured at a factory. This top plate Mt forms the ceiling part of the rectangular part M4.

[0036] The side wall body Ms is also made of concrete manufactured at a factory. This side wall body Ms is rectangular and is composed of one stage here. Note that there are side wall bodies Ms of various heights, and they may be stacked in multiple stages.

[0037] The pipe attachment wall body Ma is also a rectangular one made of concrete manufactured at a factory. As shown in Fig. 1(B), an inflow pipe IP and an outflow pipe OP are respectively connected to the pipe attachment wall body Ma. The arrows in the figure indicate the direction in which the sewage flows. Both the inflow pipe IP and the outflow pipe OP are of large diameter. For example, they are of a diameter exceeding 700 mm to 1000 mm. For such large-diameter inflow pipes IP and outflow pipes OP, it is difficult to use a cylindrical manhole, and a rectangular manhole is used.

[0038] An invert IN is arranged at the bottom of the pipe attachment wall body Ma, and the inflow pipe IP and the outflow pipe OP are connected by a groove INg provided in this invert IN.

[0039] Fig. 2 is a diagram showing a flowchart of the lining method of the manhole shown in Fig. 1.

[0040] First, ground treatment is performed (step S1). In the ground treatment, dirt, deposits, weak parts, and deteriorated parts on the inner peripheral wall of the manhole M are removed by high-pressure cleaning. If a deteriorated part remains after the high-pressure cleaning, the deteriorated part is scraped off by scraping work.

[0041] In step S2, pre-construction treatment is performed. In this pre-construction treatment, the foothold fitting SP is cut and removed. Also, when there are large cracks on the inner peripheral surface of the manhole M or when the infiltrating water leaks out, a filler is filled and sealing treatment is performed.

[0042] In step S3, a construction surface survey is performed. In the manhole lining construction method of this embodiment, it is preferable to perform the construction after returning the manhole M to its original inner dimensions. For this reason, a construction surface survey is performed, and in some cases, the inner peripheral surface of the manhole M is repaired using a repair material. The repaired inner peripheral surface is preferably processed into an uneven shape in order to improve the adhesiveness with the filler described later.

[0043] Subsequently, a flat mold is installed in the rectangular portion M4. The flat mold is installed inside the inner wall of the rectangular portion M4 over the entire inner wall surface, and is for forming a filling space for filling a filler between the outer surface of the flat mold and the inner wall of the rectangular portion M4.

[0044] In step S4, the flat mold 1 is inserted through the opening of the manhole inlet Mi.

[0045] Figure 3 is a diagram showing the flat mold.

[0046] The flat mold 1 shown in Fig. 3(A) is a repair material made of a resin mainly composed of a vinyl ester resistant to hydrogen sulfide. In manholes with a high concentration of hydrogen sulfide, cases have been reported where the mold itself and the joints of the mold are corroded by hydrogen sulfide, and hydrogen sulfide penetrates into the filler filled and cured in the filling space, corroding even the filler. For this reason, in this embodiment, the mold itself is also made resistant to hydrogen sulfide. In addition, polyethylene can be cited as another resin resistant to hydrogen sulfide.

[0047] The lateral width WL of the flat mold 1 is 650 mm. Although the lateral width WL of the flat mold 1 is longer than the inner diameter IL of the inlet Mi of the manhole M shown in Fig. 1(A), in step S4, the flat mold 1 can be inserted into the rectangular portion M4 from its inlet Mi by bending it in the lateral width direction.

[0048] The height of the flat mold 1 shown in Fig. 3(A) is 1500 mm, but for example, those with various heights can be prepared within the range of 3000 mm or less. In the flat mold 1 shown in Fig. 3(A), the side closer to the paper surface is the side of the rectangular portion M4 (the side where the filling space is formed). In the following description, the surface of the flat mold 1 that becomes the side of the rectangular portion M4 (the side where the filling space is formed) may be referred to as the outer surface OS, and the opposite side surface may be referred to as the inner surface IS.

[0049] The flat mold 1 has a flat plate portion 10 with a lateral width of 600 mm and a bifurcated portion 20 with a lateral width WL2 of just over 50 mm.

[0050] The thickness of the flat plate portion 10 is about 2 mm. On the outer surface OS of the flat plate portion 10, four protruding ridges 11 protruding toward the side of the rectangular portion M4 (the side where the filling space is formed) are provided in two upper and lower stages. The protruding length of the protruding ridge 11 is the designed thickness (for example, 6 mm). These protruding ridges 11 come into contact with the inner wall of the rectangular portion M4, and a filling space with the above-mentioned designed thickness is formed between the outer surface OS of the flat mold 1 and the inner wall of the rectangular portion M4. Each protruding ridge 11 has a shorter length in the width direction than in the vertical direction so as not to prevent the filling material from flowing down. That is, the protruding ridge 11 is a square bar made of a resin mainly composed of a vinyl ester resistant to hydrogen sulfide, with a vertical length of 300 mm and a lateral width of about 15 mm. When manufacturing the flat mold 1 in the factory, each protruding ridge 11 is attached to the outer surface OS of the flat plate portion 10 with an adhesive while ensuring a space of about 200 mm in both the horizontal and vertical directions.

[0051] An injection hole 12 for injecting the filling material is drilled on-site at the upper end of the flat plate portion 10, and an anchor hole 13 for driving an anchor at intervals of 250 mm or more and 500 mm or less in the height direction is drilled on-site at the central portion in the lateral width direction of the flat plate portion 10. These holes 12 and 13 are shown by dashed-dotted lines in Fig. 3(A).

[0052] The bifurcated part 20 has a covering part 21 extending directly from the flat plate part 10, which is provided over the entire height at one end side in the lateral direction, a wrap part 22 extending in the lateral width direction while maintaining a parallel relationship with the covering part 21 at a position about 4 mm closer to the manhole M side from the flat plate part 10, and a connecting part 23 connecting the flat plate part 10 and the wrap part 22. The lateral width of the wrap part 22 is 50 mm. In the wrap part 22, screw holes 222 are drilled on-site at locations that do not overlap with the covering part 21. In FIG. 3(A), these screw holes 222 are also indicated by dashed-dotted lines. Note that the screw holes 222 may also be drilled in the flat plate part 10. The screw holes 222 are through holes smaller than the anchor holes 13.

[0053] FIG. 3(B) is a schematic cross-sectional view of the wrap part 22 in the flat plate mold 1 shown in FIG. 3(A), with the upper part of the figure being the outer surface OS side.

[0054] The thickness of the wrap portion 22 is also about 2 mm. The wrap portion 22 is formed by sandwiching a sheet GC of a glass roving cloth (woven fabric) woven with horizontal threads of flat glass fibers similar to the vertical threads of flat glass fibers between a sheet GM of a chopped strand mat (non-woven fabric) in which short glass fibers are dispersed, and solidifying these three sheets with a resin mainly composed of a vinyl ester resistant to hydrogen sulfide. The sheet GC of the glass roving cloth has higher strength than the sheet GM of the chopped strand mat but is expensive. By inserting the sheet GC of the glass roving cloth in between, the strength and durability of the wrap portion 22 are enhanced. Also, the difference in strength between one side surface and the other side surface disappears, and the sheet GC of the glass roving cloth functions like a core material. The flat mold 1 has a structure in which a plurality of strip-shaped sheets long in the vertical direction are arranged side by side in the lateral width direction and solidified with a resin mainly composed of a vinyl ester to form an integral body. Since the sheet GC of the glass roving cloth is expensive, in most parts of the flat portion 10 and the covering portion 21, the sheet GC of the glass roving cloth is not used, and instead, three sheets of the sheet GM of the chopped strand mat are stacked and solidified with a resin mainly composed of a vinyl ester. However, in the lining portions where high strength is required or the lining portions where cost can be spent, even in the entire flat portion 10 or the covering portion 21, a structure in which the sheet GC of the glass roving cloth is sandwiched between the sheet GM of the chopped strand mat may be adopted. For example, a structure in which the sheet GC of the glass roving cloth is sandwiched between the sheet GM of the chopped strand mat may be adopted over the entire flat mold 1. Also, in the case of a three-layer structure, the position of the sheet GC of the glass roving cloth is not limited to the middle position, and may be a position on the outer surface OS side or a position on the inner surface IS side. Furthermore, a three-layer structure may be formed with the sheet GC of the glass roving cloth, or a three-layer structure in which the sheet GM of the chopped strand mat is sandwiched between the sheet GC of the glass roving cloth may be adopted. Alternatively, not limited to a three-layer structure, a two-layer structure or a structure with four or more layers including the sheet GC of the glass roving cloth may be adopted. That is, any structure having the sheet GC of the glass roving cloth is acceptable.

[0055] Also, when manufacturing the flat mold 1 in the factory, a primer layer PM is provided at locations in contact with the resin, such as the outer surface OS and the inner surface of the wrap portion 22. In Fig. 3(B), the primer layer PM is indicated by a cross mark. Examples of the primer layer PM include a layer coated with a polyester-based primer. The primer layer PM has a function of improving the adhesiveness with the resin and also has a function of improving the adhesiveness with the joint material. Therefore, the joint material is less likely to flow down due to the primer layer PM. Furthermore, since the primer layer PM improves the smoothness of the base and also improves the durability of the resin of the joint material, the primer layer PM also has a function as a surfacer layer and can be regarded as a primer surfacer (prasurf) layer.

[0056] Furthermore, in manufacturing the flat mold 1 at the factory, a resin-supporting structure is provided on the inner surface (the surface on the covering portion 21 side) of the wrap portion 22. As will be described later, between the bifurcated portions 20 (between the wrap portion 22 and the covering portion 21), the end portion of the flat portion 10 of another flat mold 1 is inserted, and the end portion of another flat mold 1 overlaps with the wrap portion 22. The lap portion where the flat molds 1 overlap each other is subjected to joint treatment. In joint treatment, joint materials such as silicone putty and acid-resistant epoxy putty are often used, but in this embodiment, a resin resistant to hydrogen sulfide is used as the joint material. For example, a resin mainly composed of vinyl ester, which is the same resin used for the flat mold 1, is used. In this way, by using, as the joint material, a material mainly composed of the same resin used for the flat mold 1, the adhesive strength can be increased. The resin mainly composed of vinyl ester has a low viscosity and is likely to drip. Therefore, it is necessary to devise a way to keep the resin in the lap portion until the resin hardens. The resin-supporting structure of this embodiment is such that a resin-supporting sheet 30 provided with a communication space communicating in the thickness direction is attached with a double-sided tape 31. The communication space mentioned here is a space connecting from one surface 30a of the resin-supporting sheet 30 to the other surface 30b, and it may have a shape that is not limited to a straight line but is intricate. One surface 30a is the surface to which the resin-supporting sheet 30 is attached with the double-sided tape 31 and is the surface located on the wrap portion 22 side. Examples of the resin-supporting sheet 30 include a 1-mm-thick felt or a foam sheet. A mesh-like sheet may also be used. The inner surface of the wrap portion 22 is preferably covered as much as possible by this resin-supporting sheet 30. That is, the resin-supporting sheet 30 is preferably provided over the entire length in the height direction of the wrap portion 22 and also over as wide a range as possible in the lateral width direction. The resin supplied in the joint treatment enters the communication space, is held for a certain period of time, gradually oozes out from each of the surfaces 30a and 30b on both sides of the sheet, and eventually hardens. Since the double-sided tape 31 may prevent the oozing of this resin, it is preferably as thin and short as possible.

[0057] Note that, as the resin support structure, the inner surface of the wrap portion 22 may be formed into a structure with recesses provided by shot peening (a matte finish structure), or a structure with jagged grooves provided by machining. Alternatively, jagged grooves may be formed when hardening with resin during the production of the flat mold 1.

[0058] In step S5 shown in FIG. 2, the lower end portion of the flat mold 1 inserted into the rectangular portion M4 is dimensioned to match the shape of the shoulder in the invert IN shown in FIG. 1, and the flat mold 1 is temporarily pulled up to the ground. On the ground, the lower end portion of the flat mold 1 is machined to match the shape of the shoulder, and at the positions of the inflow pipe IP and the outflow pipe OP, it is cut out to match those pipes.

[0059] When the machining of the lower end portion is completed, the flat mold 1 is inserted again through the opening of the manhole inlet Mi.

[0060] In step S6, the flat mold 1 is installed on the vertical walls (front wall, left and right side walls, back wall) of the rectangular portion M4. Taking the front wall M4F of the rectangular portion M4 shown in FIG. 1(A) as an example, the first flat mold 1-1 is arranged so that the end portion (the end portion of the flat portion 10) on the side opposite to the bifurcated portion 20 of the first flat mold 1-1 abuts against the left vertical edge M4e1. When the first flat mold 1-1 is arranged, the screw holes 222 shown in FIG. 3(A) are drilled in the wrap portion 22 of the bifurcated portion 20 of the first flat mold 1-1, screws are driven into the front wall M4F, and the first flat mold 1-1 is temporarily fixed with screws. Also, screw holes may be drilled at a plurality of spaced positions of the flat portion 10, and the flat portion 10 may also be temporarily fixed to the front wall M4F with screws. Note that the temporary fixing of the flat portion 10 with screws is omitted in the description of the second and subsequent flat molds, but it may be performed in the same manner.

[0061] Next, the pressing jig is set.

[0062] FIG. 4 is a view of the state in which the holding jig is set, taken from above in a horizontal cross-section. In FIG. 4, the upper side of the figure is the front wall M4F. Also, the flat mold 1 extends to the back side of the paper surface, and the ridge portion 11 is also shown in FIG. 4.

[0063] First, an anchor hole 13 indicated by a dotted line in FIG. 3(A) is drilled in the central portion in the lateral width direction of the flat plate portion 10. At this time, an injection hole 12 indicated by a dotted line in FIG. 3(A) is also drilled in alignment with the upper end portion of the flat plate portion 10.

[0064] Next, an anchor AC is driven into the front wall M4F from the anchor hole 13. The anchor AC remains in the front wall M4F even after the lining method is completed.

[0065] The holding jig 9 includes a connecting fitting 91, a pressing plate 92, a pushing member 93, and an angle member 94.

[0066] A screw hole is provided at the tip portion of the anchor AC, and the screw portion of the connecting fitting 91 is inserted into the screw hole while turning the connecting fitting 91 so as to mesh with the screw hole. The pressing plate 92 is provided with a through hole 921 through which the connecting fitting 91 passes. The connecting fitting 91 is passed through the through hole 921, and the pressing plate 92 is brought into contact with the flat mold 1. The connecting fitting 91 protrudes from the pressing plate 92 through the through hole 921. Here, the gaps around the connecting fitting 91 and the like are sealed with putty. That is, the gap between the connecting fitting 91 in the through hole 921, the gap between the connecting fitting 91 in the anchor hole 13, and the gap between the connecting fitting 91 and the tip of the anchor AC are sealed with a putty material such as silicone. In FIG. 4, the putty material that seals these gaps is shown in gray. By sealing with the putty material, it is possible to prevent the filling material from leaking out. The connecting fitting 91 is removed from the anchor AC after construction, but if it is difficult to remove due to the hardening of the putty material, the portion of the connecting fitting 91 protruding from the flat mold 1 is cut. Thereafter, it is preferable to coat the cut portion with a resin resistant to hydrogen sulfide. Note that a resin resistant to hydrogen sulfide may be used as the putty material.

[0067] Cover one end of the shaft portion 930 of the pushing member 93 on the protruding portion of the connecting fitting 91. A movable member 931 is passed through the shaft portion 930, and an angle member 94 is disposed between the movable member 931 and the pressing plate 92 so as to extend toward the back side of the paper surface. A screw groove 932 is provided on the other end side of the shaft portion 930. The dial 933 is fitted into the screw groove 932, and by tightening the dial 933, the movable member 931 moves toward the pressing plate 92 side, and the pressing force with which the pressing plate 92 presses the flat mold 1 against the front wall M4F becomes stronger, and the setting of the pressing jig 9 is completed. When the dial 933 is loosened, the pressing force weakens, and the pressing jig 9 is removed by removing the connecting fitting 91 from the screw hole.

[0068] Next, insert the end of the flat plate portion 10 of the second flat mold 1-2 between the bifurcated portions 20 (between the covering portion 21 and the wrapping portion 22) of the first flat mold 1-1 shown in Fig. 1(A) and arrange the second flat mold 1-2. The second flat mold 1-2 is provided with a cutout adapted to the inflow pipe IP in the previous step S5, and the second flat mold 1-2 is divided into upper and lower parts. Therefore, the upper part and the lower part will be arranged respectively. As a result, the wrapping portion 22 of the first flat mold 1-1 and the end of the flat plate portion 10 of the second flat mold 1-2 overlap. Since the lateral width of the wrapping portion 22 is 50 mm as described above, the overlapping margin where the first flat mold 1-1 and the second flat mold 1-2 overlap is 50 mm. Further, here, screw holes may be drilled in the overlapping portion of the two flat molds and screwed to the front wall M4F (the same applies hereinafter). When the arrangement of the second flat mold 1-2 divided into the upper part and the lower part is completed, anchor holes 13 are drilled in the upper part and the lower part respectively, and each part is pressed by a separate pressing jig 9.

[0069] Subsequently, the end of the flat plate portion 10 of the third flat plate mold 1-3 is inserted between the bifurcated portions 20 of the second flat plate mold 1-2 shown in Fig. 1(A), and the third flat plate mold 1-3 is arranged. The overlap between the second flat plate mold 1-2 and the third flat plate mold 1-3 is also 50 mm. When the arrangement of the third flat plate mold 1-3 is completed, the pressing jig 9 is set in the same manner as described above.

[0070] Up to this point, the portion from the left vertical edge M4e1 to 1850 mm is covered by the flat plate mold 1. For the remaining 150 mm, the mold piece 2 for width adjustment is used. This mold piece 2 for width adjustment is prepared by processing a flat plate mold (for example, a flat plate mold with a width of 300 mm) on site. That is, the flat plate mold is cut at a position leaving 150 mm in the lateral direction from the end of the flat plate portion 10. As a result, a mold piece 2 for width adjustment with a width of 150 mm is obtained. The mold piece 2 for width adjustment is inserted between the bifurcated portions 20 of the third flat plate mold 1-3. By doing so, the mold piece 2 for width adjustment abuts against the right vertical edge M4e2, and the front wall M4F of the rectangular portion M4 is covered from the inside by the mold without gaps. Bore holes for screws may also be drilled in the mold piece 2 for width adjustment, and the mold piece 2 for width adjustment may also be screwed to the front wall M4F. Also, the pressing plate 92 of the pressing jig 9 for pressing the third flat plate mold 1-3 may be widened, and the mold piece 2 for width adjustment together with the third flat plate mold 1-3 may be pressed by the pressing plate 92. Alternatively, anchor holes may be drilled in the mold piece 2 for width adjustment, an anchor AC may be driven in from the anchor holes, and the pressing jig 9 may also be set for the mold piece 2 for width adjustment.

[0071] For the mold that covers the front wall M4F of the rectangular portion M4 without gaps from the inside, the pressing jig 9 is set so that as many portions as possible are covered by the pressing plate 92, excluding the portions where the flat plate molds 1 overlap each other and the portions where the flat plate mold 1 and the mold piece 2 for width adjustment overlap each other. However, the location where the injection hole to be described later is drilled is not covered by the pressing plate 92.

[0072] When the installation of the flat mold 1 on the front wall M4F of the rectangular part M4 is completed, the flat mold 1 is similarly installed on the remaining three vertical walls (the right side wall M4R, the back wall, and the left side wall), and step S6 is completed.

[0073] When the installation of the flat mold 1 on the vertical wall of the rectangular part M4 is completed, joint processing is performed on the vertical wall of the rectangular part M4 (step S7).

[0074] FIG. 5 is a view seen from above with a horizontal cross-section of the overlapping portion of the flat molds 1. In this FIG. 5, similar to the previous FIG. 4, the upper side of the figure is the front wall M4F. Hereinafter, the front wall M4F side may be referred to as the outside, and the opposite side may be referred to as the inside. Further, the flat mold 1 extends to the back side of the paper surface. Furthermore, in this FIG. 5, the filling space S between the flat mold 1 and the front wall M4F is also shown.

[0075] In FIG. 5(A), the bifurcated portion 20 of the flat mold 1 shown on the left side is shown. Among the covering portion 21 and the wrapping portion 22 that constitute the bifurcated portion 20, the shorter covering portion 21 is located on the inside, and the longer wrapping portion 22 is located on the outside. The length in the lateral width direction of the wrapping portion 22 is 50 mm, while the length in the lateral width direction of the covering portion 21 is 10 mm. That is, the length in the lateral width direction of the covering portion 21 is 1 / 5 of the length in the lateral width direction of the wrapping portion 22.

[0076] Also, in FIG. 5(A), the sheet GC of the glass roving cloth (woven fabric) described with reference to FIG. 3(B) is schematically shown. The sheet GC of the glass roving cloth is provided from the vicinity of the bifurcated portion 20 of the flat portion 10 in the flat mold 1 shown on the left side, through the connecting portion 23 to the leading edge 22e of the wrapping portion 22. Note that the sheet GC of the glass roving cloth may be provided only up to the middle of the wrapping portion 22 instead of up to the leading edge 22e of the wrapping portion 22. That is, the sheet GC of the glass roving cloth may be provided at a location around the connecting portion including the connecting portion 23, from the portion of the flat portion 10 on the connecting portion 23 side to the portion of the wrapping portion 22 on the connecting portion 22 side.

[0077] The end portion 15 of the flat plate portion 10 of the flat plate mold 1 shown on the right side is inserted between the bifurcated portions 20 of the flat plate mold 1 shown on the left side (between the covering portion 21 and the wrapping portion 22) until the edge 15e of the end portion 15 abuts against the connecting portion 23. The end portion 15 overlaps the covering portion 21 by 10 mm and overlaps the wrapping portion 22 by 50 mm. The flat plate mold 1 is left in place even after the lining method is completed, and the inner surface of the flat plate mold 1 becomes the new inner wall of the rectangular portion M4.

[0078] External forces are applied to the remaining flat plate mold 1 due to earth pressure, earthquakes, etc., generating tensile forces. As shown by the thick arrows in Fig. 5(A), the end portion 15 of the flat plate portion 10 of the flat plate mold 1 shown on the right side may be deformed so as to turn up inward. Against this deformation, instead of relying only on the adhesive force of the resin, the presence of the covering portion 21 enables the end portion 15 to be held down and this deformation to be suppressed. To ensure the overlap between the covering portion 21 and the end portion 15 of the flat plate portion 10 of the flat plate mold 1 shown on the right side, the length of the covering portion 21 in the lateral width direction needs to be at least 1 / 5 of the length of the wrapping portion 22 in the lateral width direction. Also, as the length of the covering portion 21 in the lateral width direction that can hold down the end portion 15, it is also necessary to be at least 1 / 5 of the length of the wrapping portion 22 in the lateral width direction. Also, tensile forces act on the outer wrapping portion 22, but since the sheet GC of glass roving cloth has higher strength than the sheet GM of chopped strand mat, the presence of this sheet GC of glass roving cloth in the wrapping portion 22 enables it to resist the tensile force and prevent the cured resin from being broken. Also, although the flat plate portion 10 and the portion from the flat plate portion 10 to the covering portion 21 are flat, the boundary between the flat plate portion 10 and the connecting portion 23 and the boundary between the connecting portion 23 and the wrapping portion 22 are bent and are susceptible to the influence of tensile forces. The sheet GC of glass roving cloth is provided at these boundaries to reinforce these boundaries.

[0079] As described above, a resin-supported sheet 30 is attached to the inner surface (the surface on the covering portion 21 side) of the wrap portion 22 with a double-sided tape 31. The thickness of the resin-supported sheet 30 is 1 mm, and the end 15 of the flat portion 10 of the flat mold 1 shown on the right faces the wrap portion 22 through the resin-supported sheet 30. That is, the inner surface (the other surface 30b) of the resin-supported sheet 30 with a thickness of 1 mm is in contact with the end 15 of the flat portion 10 of the flat mold 1 shown on the right. In the resin-supported sheet 30, one surface 30a is located on the wrap portion 22 side, and the other surface 30b is located on the end 15 side of the flat portion 10 of the flat mold 1 shown on the right.

[0080] Also, in this Figure 5 as well, the primer layer PM is indicated by a cross mark. This primer layer PM is provided on the outer surface of the flat mold 1 shown on the left. It is also provided on the inner peripheral surface of the bifurcated portion 20. Further, it is also provided on the outer surface of the flat mold 1 shown on the right. In addition, the primer layer PM is provided on the edge 15e of the end 15 in the flat portion 10 of the flat mold 1 shown on the right, and is also provided on the surface of the end 15 facing the covering portion 21.

[0081] At the stage of installing the flat mold 1 in step S6, immediately before inserting the end of the flat portion 10 of the other flat mold 1 between the bifurcated portions 20 of one flat mold 1, the resin support sheet 30 is made to contain a resin mainly composed of a vinyl ester resistant to hydrogen sulfide. The gap GL between the portion of the end 15 in the flat portion 10 of the flat mold 1 shown on the right side, which faces the covering portion 21, and the covering portion 21 is 1 mm. In the joint treatment of step S7, a resin mainly composed of a vinyl ester is pushed into this gap GL with a spatula, and the operation of leveling the resin overflowing from this gap GL is performed. In FIG. 5, the resin is represented by fine dots. The resin contained in the resin support sheet 30 is not likely to drip downward, oozes out from both surfaces 30a and 30b of the resin support sheet 30 respectively, and the gap between the wrap portion 22 of the flat mold 1 shown on the left side and the end 15 of the flat portion 10 of the flat mold 1 shown on the right side is filled with the resin, and the wrap portion 22 of the flat mold 1 shown on the left side and the end 15 of the flat portion 10 of the flat mold 1 shown on the right side are firmly adhered over a length of 50 mm. Also, the sealing property is improved, and it is possible to prevent hydrogen sulfide from entering up to the filler and corroding even the filler.

[0082] In addition, in FIG. 5(A), although the flat mold 1 is shown on the right side, the same applies to the mold piece 2 for width adjustment.

[0083] When the joint treatment on the front wall M4F of the rectangular portion M4 is completed, the joint treatment is similarly performed on the remaining three vertical walls (the right side wall M4R, the back wall, and the left side wall), and step S7 is completed.

[0084] When the joint treatment on the vertical wall of the rectangular part M4 is completed, the filling space S secured by the protruding part 11 is filled with a filler between the vertical wall of the rectangular part M4 and the flat mold 10 (step S8 shown in Fig. 2). As described above, when drilling the anchor holes 13, the injection holes 12 (see Fig. 3(A)) are also drilled at the upper ends of the flat parts 10 of each flat mold 1. Note that the injection holes 12 do not need to be drilled in all the flat molds 1 and the mold pieces 2 for width adjustment. Instead, they may be drilled at only one location (for example, the front wall M4F) or two locations for one wall. Also, the injection holes 12 may be drilled at a timing different from that of drilling the anchor holes 13 (for example, immediately before filling the filler).

[0085] As the filler, a room-temperature curing resin mainly composed of an epoxy resin is used, and the filler is injected into the filling space S from the injection holes 12 by the force of a pump, one wall at a time. For example, in the filling space of the front wall M4F, in the first injection, the resin is filled up to about 300 mm in height, in the second injection, up to about 700 mm in height, in the third injection, up to about 1100 mm in height, and finally up to 1500 mm. Next, the resin is similarly injected into the filling space S of the right side wall M4R in four portions, and the resin is also similarly injected into the filling space S of the back wall in four portions. Finally, the resin is also similarly injected into the filling space S of the left side wall in four portions. Although the injection of the resin is carried out in multiple times in this way, the amount of the first injection is minimized to surely form the part serving as the foundation at the bottom. Also, there is a meaning to confirm that there is no leakage of the filler from the bottom, so the amount of the first injection is reduced. For the filling of the filler in the vertical wall, the filler may be injected by its own weight without using a pump.

[0086] Note that the pressing jig is removed after the filled resin is completely cured.

[0087] Subsequently, a flat mold that covers the top plate of the rectangular portion M4 from the inside is inserted through the opening of the manhole inlet Mi (step S9). Since the flat mold that covers the top plate of the rectangular portion M4 from the inside has a width of 350 mm, it can be easily inserted through the opening of the manhole inlet Mi. The flat mold that covers the top plate of the rectangular portion M4 from the inside is horizontally installed and thus receives the weight of the filling material. Even if it is pressed by a pressing jig as described later, with a width of 650 mm, the flat mold itself is likely to sag downward, and a flat mold with a narrower width than the vertically arranged flat mold 1 is used. Note that the difference between the flat mold with a width of 350 mm and the flat mold with a width of 650 mm shown in Fig. 3(A) is only that the flat portion of the 350-mm flat mold is 300 mm shorter than the flat portion of the 650-mm flat mold. Hereinafter, components with the same names as the components of the flat mold with a width of 650 mm shown in Fig. 3(A) will be described with the same reference numerals as those previously assigned.

[0088] At the portion of the flat mold inserted into the rectangular portion M4 that comes to the position connected to the straight wall portion M3 shown in Fig. 1, the dimension of the inner diameter DL of the straight wall portion M3 is measured. The flat mold after the dimension measurement is once lifted up to the ground, and the flat mold is subjected to a cutting process so as to match the inner diameter DL of the straight wall portion M3 (step S10).

[0089] When the process in step S10 is completed, the flat mold is inserted again through the opening of the manhole inlet Mi.

[0090] In step S11, a flat mold is installed on the top plate Mt of the rectangular portion M4. Referring to FIG. 1(A), the first flat mold 6-1 is arranged such that the end portion (the end portion of the flat portion 10) opposite to the bifurcated portion 20 of the first flat mold 6-1 abuts against the edge Mte1 on one side of the top plate Mt, and the first flat mold 6-1 is temporarily fixed to the top plate Mt with screws. Next, anchor holes are drilled in the central portion in the lateral width direction of the flat portion 10. Subsequently, anchors are driven into the top plate Mt through the anchor holes drilled in the flat portion 10, and the flat mold 6-1 is pressed by a pressing jig. The pressing jig used here has the same configuration as the pressing jig 9 described with reference to FIG. 4, but the width of the pressing plate is narrower than the width of the pressing plate 92 shown in FIG. 4.

[0091] Next, the end portion of the flat portion 10 of the second flat mold 6-2 is inserted between the bifurcated portions 20 of the first flat mold 6-1. This time, the second flat mold 6-2 is screwed, and further, anchor holes are drilled, and the second flat mold 6-2 is pressed by a pressing jig. Thereafter, the same operation is repeated until the end portion of the flat portion 10 of the fifth flat mold 6-5 is inserted between the bifurcated portions 20 of the fourth flat mold 6-4. The fifth flat mold 6-5 is provided with a cutout adapted to the straight wall portion M3 in the previous step S10, and the fifth flat mold 6-5 is divided into left and right parts. Therefore, the left and right parts are respectively inserted between the bifurcated portions 20 of the fourth flat mold 6-4. Then, the left and right parts are respectively screwed, and further, anchor holes are drilled in each part, and each part is pressed by a separate pressing jig. The sixth flat mold 6-6 is the same as the fifth flat mold 6-5. Finally, a mold piece 7 for width adjustment for the remaining 150 mm is cut out, and the end portions of the mold piece 7 for width adjustment are inserted between the bifurcated portions 20 of the sixth flat mold 6-6 divided into left and right parts. After this mold piece 7 is also screwed, the mold piece 7 is also pressed by a pressing jig.

[0092] In step S12, joint treatment is performed on the top plate Mt of the rectangular portion M4. For the joint treatment here, a resin mainly composed of vinyl ester is used as the joint material. Although the front wall M4F, which is a vertical wall, was shown in Fig. 5(A), this front wall M4F can be replaced with the top plate Mt, which is a horizontal wall. The following description will continue with reference to Fig. 5(A). In the flat mold installed on the top plate Mt of the rectangular portion M4, the joint material is more likely to drip than in the flat mold installed on the vertical wall, and the effect of the resin support sheet 30 is exerted. That is, if the resin support sheet 30 is filled with resin so as to completely fill the communication space of the resin support sheet 30, although there is no resin oozing upward, the resin flowing downward is blocked at the end 15 of the flat plate portion 10 in the inserted flat mold shown in Fig. 5(A). Therefore, the gap between the wrap portion 22 of the flat mold shown on the left side and the end 15 of the flat plate portion 10 of the flat mold shown on the right side is filled with resin, and the wrap portion 22 of the flat mold shown on the left side and the end 15 of the flat plate portion 10 of the flat mold shown on the right side are firmly adhered over a length of 50 mm. Also, the sealing performance is improved. Further, in the joint treatment of step S12, resin is pushed into the gap GL shown in Fig. 5(A) with a spatula, and the operation of leveling the resin that is about to drip from this gap GL is performed.

[0093] In step S13 shown in Fig. 2, a filler is filled into the filling space S secured by the protruding strip 11 between the top plate of the rectangular portion M4 and the flat mold 10. When filling the filler, an injection hole for injecting the filler is drilled. The injection hole here is drilled at one end side in the longitudinal direction orthogonal to the width direction of the flat mold or the mold piece for width adjustment. Since the top plate Mt is a horizontal wall, unlike a vertical wall, it is difficult to fill the filler. Even if an attempt is made to fill the filler from the central portion in the longitudinal direction, the flow path of the filler is not determined, and the filling does not proceed well. When filling from one end side in the longitudinal direction, the filling space expands toward the other end side, and the filler is injected toward the other end side by the pressure of the pump. In addition, the protruding strip 11 provided on the outer surface OS of the flat mold and extending from one end side to the other end side may be made to gradually increase the protruding amount from one end side to the other end side to ensure an inclination. However, even if it is called an inclination, it is a very slight inclination with an inclination angle of about several degrees. Also, the injection holes do not have to be drilled in all the flat molds and the mold pieces for width adjustment, and may be drilled at only one location or may be drilled every other one. However, since the wrap portion 22 is closer to the manhole M side as described above, the filling space S is also thinner accordingly. In order to more surely distribute the filler to this thinner portion, it is preferable to drill injection holes in all the flat molds. Also, when drilling the anchor holes in step S9, the injection holes may be drilled together.

[0094] Also, as the filler here, a room temperature curing type resin mainly composed of an epoxy resin is used, and the filler is injected in multiple portions by the force of the pump from the injection hole. That is, the resin is pushed from the one end side provided with the injection hole toward the other end side, and the curing of the resin proceeds from the other end side toward the one end side.

[0095] Note that the pressing jig is removed after the filled resin is completely cured.

[0096] Next, install the straight-wall mold (step S14). The straight-wall mold is a cylindrical one installed inside the straight-wall portion M3 shown in FIG. 1, but it is an arc-shaped sheet body at the stage of being inserted from the opening of the manhole inlet Mi. That is, it is inserted from the opening of the manhole inlet Mi in a reduced-diameter state where both circumferential ends of the arc-shaped sheet body are overlapped. This sheet body for the straight-wall mold is also made of a resin mainly composed of vinyl ester, and protruding portions protruding outward are evenly dispersed at intervals.

[0097] Fit the lower end of the sheet body for the straight-wall mold inserted into the manhole inside the opening Mto (see FIG. 1) that connects the rectangular portion M4 and the straight-wall portion M3 of the top plate Mt. Expand the sheet body by the operator's hand until the protruding portion of the straight-wall mold abuts against the inner peripheral wall of the straight-wall portion. The sheet body becomes a cylindrical straight-wall mold with one circumferential end overlapping the other end. Then, in a state where one circumferential end overlaps the other end, drive anchor bolts toward the inner peripheral wall of the straight-wall portion M3 at some of the protruding portions selected to be evenly scattered in the circumferential direction among the plurality of provided protruding portions, and the straight-wall mold is fixed to the inner peripheral wall of the straight-wall portion M3. Next, install a pressing jig on the inner peripheral side of the straight-wall mold. Although the straight-wall mold is fixed to the inner peripheral wall of the straight-wall portion M3 with anchor bolts, when the filling material is filled into the filling space secured by the protruding portions between the inner peripheral wall of the straight-wall portion M3 and the straight-wall mold, the straight-wall mold may bulge inward or collapse due to the weight of the filling material, and it is necessary to press the straight-wall mold from the inside with a pressing jig. When the installation of the pressing jig is completed, step S14 is completed.

[0098] In step S15, perform joint treatment on the straight-wall mold. Also in the joint treatment here, use a resin mainly composed of vinyl ester.

[0099] When the joint process of step S15 is completed, a filler is filled into the filling space secured by the protruding portion between the inner peripheral wall of the straight wall portion M3 and the straight wall mold (step S16). Here too, as the filler, a room temperature curable resin mainly composed of an epoxy resin is used. The filler is poured into the filling space by utilizing gravity from between the upper edge of the straight wall mold and the inner peripheral wall of the straight wall portion M3.

[0100] In step S17, the inclined wall mold is installed. The inclined wall mold is formed by combining a plurality of divided sheet bodies. The inclined wall mold is installed inside the height adjusting member M1 and the inclined wall portion M2 shown in FIG. 1(B). The neck mold installed inside the height adjusting member M1 is a sheet body made of resin mainly composed of arcuate vinyl ester, similar to the sheet body of the straight wall mold. However, the lower end portion is bent radially outward and extends obliquely downward. Further, on this sheet body, protruding portions are evenly provided at intervals in the circumferential direction, immediately above the bent lower end portion. The main body mold installed inside the inclined wall portion M2 is a sheet body made of resin mainly composed of vinyl ester, which is divided into a plurality of parts in the circumferential direction.

[0101] In step S17, first, the sheet body of the neck mold is inserted through the opening of the manhole inlet Mi in a reduced diameter state with both circumferential ends overlapped. Next, the operator expands the sheet body of the neck mold by hand until the protruding portion abuts against the inner peripheral wall of the height adjusting member M1 inside the height adjusting member M1, and the sheet body becomes a cylindrical neck mold with one circumferential end overlapping the other end. In this state, anchor bolts are driven into the inner peripheral wall of the height adjusting member M1 at some or all of the plurality of provided protruding portions. As a result, the neck mold is fixed to the inner peripheral wall of the height adjusting member M1 with the filling space secured.

[0102] Next, insert the sheet body of the main body mold through the opening of the manhole inlet Mi. The sheet body of the main body mold is divided into a plurality (here, three) in the circumferential direction. Hereinafter, the sheet body divided into three will be referred to as the first sheet body, the second sheet body, and the third sheet body. First, fit the lower end portion of the first sheet body inside the upper end portion of the straight wall mold, and drive an anchor bolt into the fitted portion. Next, arrange the second sheet body so that one circumferential end portion of the first sheet body and the other circumferential end portion of the second sheet body overlap. Also for the second sheet body, fit the lower end portion inside the upper end portion of the straight wall mold, and drive an anchor bolt into the fitted portion. Finally, arrange the third sheet body between the other circumferential end portion of the first sheet body and one circumferential end portion of the second sheet body. One circumferential end portion of the third sheet body and the other circumferential end portion of the first sheet body overlap each other, and the other circumferential end portion of the third sheet body and one circumferential end portion of the second sheet body also overlap each other. Also for the third sheet body, fit the lower end portion inside the upper end portion of the straight wall mold, and drive an anchor bolt into the fitted portion. The outer peripheral surfaces of the upper edge portions of the first sheet body, the second sheet body, and the third sheet body are in contact with the inner peripheral surface of the lower end portion of the previously installed neck mold.

[0103] The first sheet body, the second sheet body, and the third sheet body are not provided with protrusions, but the upper end portion of the straight wall mold into which the lower end portion of each is fitted is provided with protrusions, and the filling spaces of the lower portions of each of the three sheet bodies are guaranteed by these protrusions. On the other hand, the filling spaces of the upper portions of each of the three sheet bodies are guaranteed by the protrusions of the neck mold.

[0104] In step S18, joint treatment of the inclined wall mold is performed. In the joint treatment of the inclined wall mold, the portions where one circumferential end portion and the other circumferential end portion of the sheet body of the neck mold overlap, the portion where the first sheet body and the second sheet body overlap in the circumferential direction, the portion where the second sheet body and the third sheet body overlap in the circumferential direction, and the portion where the first sheet body and the third sheet body overlap in the circumferential direction are each subjected to joint treatment. Here too, as the joint material, a resin mainly composed of a vinyl ester resistant to hydrogen sulfide is used.

[0105] Note that the inclined wall mold may be an arcuate sheet body that is not a three - divided body of the main body mold and is integrated with the neck mold, and an arcuate sheet body may be used.

[0106] When the joint treatment of the inclined wall mold is completed, a filler is filled into the filling space secured by the protrusion between the inner peripheral walls of the height adjustment member M1 and the inclined wall portion M2 and the inclined wall mold (step S19). The filling of the filler here is a continuation of the filling of the filler in step S16, and the same filler as that used in step S16 is poured using gravity. When the filler is filled up to the upper edge of the neck mold, a sealing treatment is performed with a putty mainly composed of a vinyl ester resistant to hydrogen sulfide, which is the same as the joint material used in the joint treatment, and step S19 ends.

[0107] In step S20, processing is performed from the inner peripheral surface of the mold to install a new footrest fitting. Also, the inner peripheral surface of the mold is cleaned. Thus, the manhole lining method is completed.

[0108] By the manhole lining method described above, a manhole lining structure covering the inner peripheral wall of the manhole M is completed. In the completed manhole lining structure, the strength is maintained by various molds such as the flat molds 1, 6, etc. and the cured filler, and the inner surfaces of the various molds become the new inner walls of the manhole with a backing.

[0109] In the vertical walls (front wall M4F, right side wall M4R, back wall, left side wall) of the rectangular part M4 of the present embodiment, the tensile strength of the overlapping parts of the flat molds 1, and in the ceiling wall (top plate Mt) of the rectangular part M4, the tensile strength of the overlapping parts of the flat molds 6, it was confirmed that they are improved to the same level as the tensile strength of the flat parts 10 of the flat molds 1, 6. Contributing to this effect are the adhesion by the resin retained by the resin-supporting sheet 30 described above, the pressing by the covering part 21, and the reinforcement by the glass roving cloth sheet GC of the lapping part. By improving the tensile strength, the hardening of the resin at the overlapping parts of the flat molds is reduced from being destroyed. As a result, the sealing property is maintained, and it is possible to prevent hydrogen sulfide from entering up to the filler and corroding even the filler.

[0110] Figure 5(B) is a view of a first modification of the structure of the overlapping part of the flat molds, cross-sectioned horizontally in the same manner as in Fig. (A) of the same figure and viewed from above. Hereinafter, the description will focus on the differences from the example shown in Fig. 5(A). In addition, components with the same names as the components described so far will be described with the same reference numerals as those given so far.

[0111] The length of the covering portion 21 in the lateral width direction shown in Fig. 5(A) was 10 mm, whereas the length of the covering portion 21 in the lateral width direction in this first modified example is 25 mm, which is half the length of the 50-mm wrap portion 22. In a flat mold with a height of 3000 mm, for example, even if the end portion 15 of the flat portion 10 of the other flat mold is firmly inserted into the bifurcated portion 20 of one flat mold at the upper part, at the lower part, there is a risk that the other flat mold will slip out just by being slightly inclined. In order to ensure that it is inserted throughout the entire height, in this first modified example, the length of the covering portion 21 in the lateral width direction is set to 25 mm. Note that the longer the length of the covering portion 21 in the lateral width direction, the more difficult it is to insert the other flat mold into the bifurcated portion 20. Moreover, not only does it become difficult to manufacture the bifurcated portion 20 itself, but also the operations of attaching the resin-supporting sheet 30 and impregnating the attached resin-supporting sheet 30 with resin become difficult. For these reasons, it is preferable to keep the length of the covering portion 21 in the lateral width direction at 1 / 2 or less of the length of the wrap portion 22 in the lateral width direction.

[0112] Moreover, the first modified example is an example in which the resin-supported sheet 30 is attached to the inner peripheral surface of the bifurcated portion 20 as much as possible. That is, in addition to the inner peripheral surface of the wrap portion 22 (the surface on the covering portion 21 side), the resin-supported sheet 30 is attached to the inner peripheral surface of the connecting portion 23 and the inner peripheral surface of the covering portion 21 (the surface on the wrap portion 22 side) with a double-sided tape 31. The thickness of each resin-supported sheet 30 is 1 mm. The resin-supported sheet 30 provided on the inner peripheral surface of the wrap portion 22 contacts the outer surface of the end portion 15 of the flat plate portion 10 of the flat plate mold 1 shown on the right side. The resin-supported sheet 30 provided on the inner peripheral surface of the connecting portion 23 contacts at least a part of the edge 15e of the end portion 15 in the flat plate portion 10 of the flat plate mold 1 shown on the right side. The resin-supported sheet 30 provided on the inner peripheral surface of the covering portion 21 contacts the inner surface of the end portion 15 in the flat plate portion 10 of the flat plate mold 1 shown on the right side. The resin contained in each resin-supported sheet 30 is less likely to drip downward, oozes out from both sides of each resin-supported sheet 30, and the gap between the inner peripheral surface of the bifurcated portion 20 of the flat plate mold 1 shown on the left side and the end portion 15 of the flat plate portion 10 of the flat plate mold 1 shown on the right side is filled with resin, and the bifurcated portion 20 of the flat plate mold 1 shown on the left side and the end portion 15 of the flat plate portion 10 of the flat plate mold 1 shown on the right side are firmly adhered as a whole. Also, the sealing property is improved, and it is possible to prevent hydrogen sulfide from entering the filler and corroding even the filler.

[0113] Moreover, in the first modified example, a sheet GC of glass roving cloth (woven fabric) is provided at a location around the connecting portion including the connecting portion 23 from the boundary between the flat plate portion 10 and the connecting portion 23 to the boundary between the connecting portion 23 and the wrap portion 22. The bent portion that is easily affected by the tensile force is reinforced by the sheet GC of glass roving cloth, and it is possible to resist the tensile force caused by earth pressure, earthquake, etc. Also, the connecting portion 23 is reinforced by the sheet GC of glass roving cloth. In the wrap portion 22, the sheet GC of glass roving cloth may be provided up to the same position as the position of the leading edge 21e of the covering portion 21.

[0114] FIG. 6 is a view of a horizontally cross-sectioned second modified example and a third modified example of the structure of the overlapping portion of flat molds as viewed from above, in the same manner as FIG. 5(A). The upper side of the figure is the inner wall M4I side of the rectangular portion. Hereinafter, the inner wall M4I side may be referred to as the outer side, and the opposite side may be referred to as the inner side. Hereinafter, the description will focus on the differences from the example shown in FIG. 5(A). Also, components having the same name as the components described so far will be described with the same reference numerals as those attached so far.

[0115] FIG. 6(A) is a view showing a second modified example.

[0116] Even in the second modified example, it has a covering portion 21 with a width of 10 mm and a wrapping portion 22 with a width of 50 mm. In this second modified example, the covering portion 21 does not extend directly from the flat plate portion 10, but protrudes in the width direction while maintaining a parallel relationship with the wrapping portion 22 at a position approximately 2 mm closer to the inner side from the flat plate portion 10. On the other hand, the wrapping portion 22 extends in the width direction while maintaining a parallel relationship with the covering portion 21 at a position approximately 2 mm closer to the outer side from the flat plate portion 10. The connecting portion 23 is a portion that connects the flat plate portion 10 to the covering portion 21 and the wrapping portion 22 respectively.

[0117] In this second modification example as well, similar to the first modification example, it is an example in which the resin-supporting sheet 30 is attached to the inner peripheral surface of the bifurcated portion 20 as much as possible. That is, the resin-supporting sheet 30 is attached to the inner peripheral surface of the wrap portion 22 (the surface on the covering portion 21 side), the inner peripheral surface of the connecting portion 23, and the inner peripheral surface of the covering portion 21 (the surface on the wrap portion 22 side) with double-sided tape 31. The edge 15e of the end portion 15 in the flat plate portion 10 of the flat plate mold 1 shown on the right abuts against the resin-supporting sheet 30 attached to the inner peripheral surface of the connecting portion 23. The resin-supporting sheet 30 provided on the inner peripheral surface of the wrap portion 22 is in contact with the outer surface of the end portion 15 of the flat plate portion 10 of the flat plate mold 1 shown on the right. The resin-supporting sheet 30 provided on the inner peripheral surface of the connecting portion 23 is in contact with the entire edge 15e of the end portion 15 in the flat plate portion 10 of the flat plate mold 1 shown on the right. The resin-supporting sheet 30 provided on the inner peripheral surface of the covering portion 21 is in contact with the inner surface of the end portion 15 in the flat plate portion 10 of the flat plate mold 1 shown on the right. The resin contained in each resin-supporting sheet 30 does not easily drip downward, oozes out from both sides of each resin-supporting sheet 30, and the gap between the inner peripheral surface of the bifurcated portion 20 of the flat plate mold 1 shown on the left and the end portion 15 of the flat plate portion 10 of the flat plate mold 1 shown on the right is filled with resin, and the bifurcated portion 20 of the flat plate mold 1 shown on the left and the end portion 15 of the flat plate portion 10 of the flat plate mold 1 shown on the right are firmly adhered as a whole. Also, the sealing property is improved.

[0118] Also, in this second modification example, a primer layer PM is provided on the outer surface OS of the flat plate mold 1 that contacts the filler, but is not provided on the inner peripheral surface of the bifurcated portion 20. In the example shown in FIG. 5(A) as well as in the first modification example, the primer layer PM may be provided on the outer surface OS of the flat plate mold 1 that contacts the filler and not provided at locations where there is no possibility of contacting the filler. Alternatively, conversely, in the second modification example, the primer layer PM may also be provided on the inner peripheral surface of the bifurcated portion 20.

[0119] Furthermore, in the second modification example, a glass roving cloth (woven fabric) sheet GC is also provided on the covering portion 21. That is, the glass roving cloth sheet GC shown in FIG. 6(A) is provided from the vicinity of the bifurcated portion 20 of the flat plate portion 10 in the flat plate mold 1 shown on the left side, through the connecting portion 23, to the leading edge 21e of the covering portion 21 and up to the middle of the wrapping portion 22. Also in the second modification example, the strength of the wrapping portion 22 is improved by the glass roving cloth sheet GC, and it can withstand tensile forces caused by earth pressure, earthquakes, etc. Furthermore, the strength of the covering portion 21 is also improved by the glass roving cloth sheet GC. Therefore, deformation in which the end portion 15 of the flat plate portion 10 of the flat plate mold 1 shown on the right side turns upward inward (refer to the thick arrow shown in FIG. 5(A)) due to earth pressure, earthquakes, etc. can be more reliably suppressed by this covering portion 21. Note that the glass roving cloth sheet GC is provided for the same length on the covering portion 21 and the wrapping portion 22, but the glass roving cloth sheet GC may be provided up to the leading edge 22e of the wrapping portion 22. Also, in the second modification example, the covering portion 21 is closer to the inside from the flat plate portion 10. Therefore, in addition to the portion from the bifurcated portion 20 side of the flat plate portion 10 to the flat plate portion side of the wrapping portion 22, the glass roving cloth sheet GC is also provided at the portion from the bifurcated portion 20 side of the flat plate portion 10 to the flat plate portion side of the covering portion 21 to reinforce those portions.

[0120] FIG. 6(B) is a diagram showing a third modification example.

[0121] Even in the third modification example, it has a covering portion 21 and a wrapping portion 22. In this third modification example, in the flat mold 1 shown on the left side, the flat plate portion 10, the wrapping portion 22, and the connecting portion 23 connecting the flat plate portion 10 and the wrapping portion 22 are integrally formed, but the covering portion 21 is a separate body. That is, the covering portion 21 of the third modification example has a structure in which three sheets of a chopped strand mat (non-woven fabric) are stacked and solidified with a resin mainly composed of vinyl ester, and the lateral width is 30 mm. The length of the portion overlapping the wrapping portion 22 is 15 mm. Incidentally, this separate covering portion 21 may be one in which a glass roving cloth (woven fabric) sheet is disposed between the sheets of the chopped strand mat.

[0122] On the outer surface of the covering portion 21 shown in FIG. 6(B), a resin-supporting sheet 30 with a lateral width of about 30 mm is attached by a double-sided tape 31. In the joint treatment of the flat mold, a resin mainly composed of vinyl ester is included in the resin-supporting sheet 30, and the covering portion 21 is attached from the inside so as to straddle the flat plate portion 10 of the left flat mold 1 and the flat plate portion 10 of the right flat mold 1, thereby performing the joint treatment. The resin contained in the resin-supporting sheet 30 attached to the separate covering portion 21 also does not easily drip downward, oozes out from both sides of this resin-supporting sheet 30, and the resin fills from the inner surface of the flat plate portion 10 of the flat mold 1 shown on the left side to the inner surface of the end portion 15 of the flat plate portion 10 of the flat mold 1 shown on the right side. As a result, the three parts, i.e., the flat plate portion 10 of the flat mold 1 shown on the left side, the end portion 15 of the flat plate portion 10 of the flat mold 1 shown on the right side, and the separate covering portion 21, are firmly adhered. As a result, even if the covering portion 21 is a separate body, deformation (refer to the thick arrow shown in FIG. 5(A)) in which the end portion 15 of the flat plate portion 10 of the flat mold 1 shown on the right side turns up inward due to earth pressure, earthquake, etc. can be suppressed by this covering portion 21. Also, the sealing property is improved, and it is possible to prevent hydrogen sulfide from entering up to the filler and corroding even the filler. Further, in this third modification example, the operation of attaching the resin-supporting sheet 30 and the operation of including the resin in the attached resin-supporting sheet 30 are also easy to perform.

[0123] Further, in the third modification, the glass roving cross (woven fabric) sheet GC is provided only at two locations, namely, the boundary between the flat plate portion 10 and the connecting portion 23 and the boundary between the connecting portion 23 and the wrap portion 22. This is an example in which the expensive glass roving cross sheet GC is most economized. However, the bent portions that are easily affected by the tensile force are reinforced by the glass roving cross sheet GC, and it is possible to resist the tensile force caused by earth pressure, earthquake, etc.

[0124] Note that the glass roving cross sheet GC may be provided only at the connecting portion 23 among the flat plate portion 10, the connecting portion 23, and the wrap portion 22. Further, the glass roving cross sheet GC may be provided only at at least a part of the connecting portion instead of the entire connecting portion 23.

[0125] Note that a sheet of glass roving cross (woven fabric) may be sandwiched between sheets of chopped strand mat (non-woven fabric) on a straight wall mold or an inclined wall mold (which may be divided or integral), and a resin mainly composed of vinyl ester may be used to solidify these three sheets.

[0126] Further, a resin support structure (for example, the resin support sheet 30) may be provided at the overlapping portion of the straight wall mold or the inclined wall mold (which may be divided or integral). Further, a bifurcated portion 20 may be provided at one end in the circumferential direction of an arcuate straight wall mold or a neck mold, and the other end in the circumferential direction may be inserted between the bifurcated portions 20 to form a mold connection body. In this case, the base portion is the portion between one end in the circumferential direction and the other end in the circumferential direction. Alternatively, a bifurcated portion 20 may be provided at one end in the circumferential direction of each sheet body (the first sheet body, the second sheet body, the third sheet body) constituting the main body mold, and the other end of the sheet body adjacent in the circumferential direction may be inserted between the bifurcated portions 20 to form a mold connection body.

[0127] Furthermore, grout material may be used instead of resin as the filling material. As the grout material, a material obtained by mixing powder cement, admixture, and water on site or a premix type in which powder cement and admixture are previously blended is used.

[0128] The above description is recorded below as an appendix.

[0129] (Appendix 1) A mold connecting body [for example, the connecting body of the left flat mold 1 and the right flat mold 1 shown in FIGS. 5 and 6] having a first end [for example, the wrap portion 22 shown in FIGS. 5 and 6] and a second end [for example, the end 15 of the right flat mold 1 shown in FIGS. 5 and 6] that are connected to each other and cover the inner wall of the manhole [for example, the front wall M4F, the top plate Mt] from the inside of the inner wall leaving a filling space [for example, the filling space S] between the inner wall and the inner wall. The first end and the second end overlap each other, and the overlapping portion is adhered by a resin [for example, a resin mainly composed of vinyl ester]. The mold connecting body is characterized in that the first end is provided with a resin supporting structure [for example, the resin supporting sheet 30] for supporting the resin.

[0130] (Appendix 2) The mold connecting body according to Appendix 1, wherein the resin is a resin resistant to hydrogen sulfide [for example, a resin mainly composed of vinyl ester].

[0131] (Appendix 3) The resin supporting structure is a structure [for example, a structure pasted with a double-sided tape 31] in which a resin supporting body [for example, the resin supporting sheet 30] having a first surface [for example, one side surface 30a] located on the first end side and a second surface [for example, the other side surface 30b] located on the second end side is fixed to the first end. The mold connecting body according to Appendix 1 or 2, wherein the resin supporting body is provided with a communication space connecting the first surface to the second surface.

[0132] (Appendix 4) A first mold [for example, the left flat mold 1 shown in FIGS. 5 and 6], And a second mold [for example, the right flat mold 1 shown in FIGS. 5 and 6]. The first mold and the second mold are connected together. The first end portion [for example, the wrap portion 22] is the end portion of the first mold on the second mold side. The second end portion [for example, the end portion 15 of the flat plate mold 1 on the right side shown in FIGS. 5 and 6] is the end portion of the second mold on the first mold side. The mold connector according to Addendum 1 or 2, characterized in that.

[0133] (Addendum A) A mold connector [for example, a connector of the left flat plate mold 1 and the right flat plate mold 1 shown in FIGS. 5 and 6] that covers the inner wall of the manhole [for example, the front wall M4F, the top plate Mt] from the inside of the inner wall leaving a filling space [for example, the filling space S] between the inner wall and the inner wall, and has a first end portion [for example, the wrap portion 22 shown in FIGS. 5 and 6] and a second end portion [for example, the end portion 15 of the flat plate mold 1 on the right side shown in FIGS. 5 and 6] that are connected to each other. The first end portion and the second end portion overlap each other, and the overlapping portion is adhered by a resin [for example, a resin mainly composed of vinyl ester]. The first end portion is located closer to the inner wall side than the second end portion. Furthermore, the mold connector is characterized in that it has a covering portion [for example, the covering portion 21] that covers the second end portion from the side opposite to the inner wall side [for example, the outer side] [for example, the inner side].

[0134] There is a problem that the tensile strength of the overlapped and adhered portion of the mold is greatly reduced compared to the tensile strength of the mold itself that is not overlapped. Although this problem seems to be solved by increasing the adhesive strength of the resin, there is a certain limit to increasing the adhesive strength of the resin.

[0135] According to the mold connector described in Addendum A, even if the second end portion is likely to be turned up inward due to a tensile force caused by earth pressure, earthquake, etc., the second end portion can be held by the covering portion, and the tensile strength of the overlapped and adhered portion is increased.

[0136] Note that the first end portion and the covering portion may be separate from each other.

[0137] (Appendix B) A first mold [for example, the left flat mold 1 shown in FIGS. 5 and 6], and a second mold [for example, the right flat mold 1 shown in FIGS. 5 and 6], and the first mold and the second mold are connected, the first end portion [for example, the wrap portion 22] is the end portion of the first mold on the second mold side, the second end portion [for example, the end portion 15 of the right flat mold 1 shown in FIGS. 5 and 6] is the end portion of the second mold on the first mold side, and the mold connector described in Appendix A is characterized in that.

[0138] Note that both end portions in the circumferential direction of a single arc-shaped mold are connected, the first end portion is one end portion in the circumferential direction of the arc-shaped mold, and the second end portion may be the other end portion in the circumferential direction of the arc-shaped mold.

[0139] (Appendix C) The first mold has a base [for example, the flat portion 10], the first end portion [for example, the wrap portion], and the covering portion [for example, the covering portion 21], and the base, the first end portion, and the covering portion are integrally formed [for example, the left flat mold 1 shown in FIG. 5, the left flat mold 1 shown in FIG. 6(A)], and the mold connector described in Appendix B is characterized in that.

[0140] Note that the base and the first end portion are integral, and the covering portion may be separate from the base and the first end portion.

[0141] Further, the first mold may have a first connecting portion connecting the base and the first end portion. Furthermore, the first mold may have a second connecting portion connecting the base and the covering portion.

[0142] (Appended Note D) The covering portion is a mold coupling body according to Appended Note C, characterized in that the length extending in the direction opposite to the base portion is 1 / 5 or more and 1 / 2 or less of the length at the first end portion.

[0143] To hold down the second end portion where the covering portion tends to turn up inward, a length of 1 / 5 or more is required. Also, if the length of the covering portion is less than 1 / 5, as the length in the longitudinal direction orthogonal to the overlapping width of the mold coupling body increases, it becomes difficult for the covering portion to cover the second end portion over the entire length in the longitudinal direction. On the other hand, if the length of the covering portion exceeds 1 / 2, it becomes difficult to insert the first end portion between the covering portion and the second end portion.

[0144] (Appended Note α) A mold [flat mold 1, flat mold 6] that covers the inner wall of a manhole [for example, the front wall M4F, the top plate Mt] from the inside of the inner wall leaving a filling space [for example, filling space S] between the inner wall and the inner wall, A part [for example, from the vicinity of the bifurcated portion 20 of the flat portion 10, through the connecting portion 23 to the leading edge 22e of the wrapping portion 22] or all [for example, over the entire flat mold 1] is a laminate of a woven fabric of glass fiber [for example, a sheet GC of a glass roving cloth] and a non-woven fabric of glass fiber [for example, a sheet GM of a chopped strand mat] and solidified with resin. The mold is characterized in that.

[0145] The inner surface of the mold becomes a new inner wall of the manhole. It has been found that external forces such as earth pressure and earthquakes are applied to the mold that has become a new inner wall, in addition to corrosion by hydrogen sulfide, the influence of vehicle vibrations, and aging deterioration, generating tensile and compressive forces.

[0146] The woven fabric of glass fiber has higher strength than the non-woven fabric of glass fiber. Therefore, according to the mold of Appended Note α, since the woven fabric of glass fiber is included, the strength is further enhanced.

[0147] Note that the inner wall may be a peripheral wall or a ceiling wall.

[0148] (Supplementary Note β) The resin is a resin resistant to hydrogen sulfide [for example, a resin mainly composed of vinyl ester [for example, a resin mainly composed of vinyl ester]]. The mold described in Supplementary Note α is characterized by this.

[0149] Since the mold itself may be corroded by hydrogen sulfide, it is preferable to use a resin resistant to hydrogen sulfide. For example, the resin is preferably a vinyl ester resin.

[0150] (Supplementary Note γ) The mold described in Supplementary Note α or β is characterized in that part or all of it sandwiches a woven fabric of the glass fiber with a non-woven fabric of the glass fiber [for example, Fig. 3(B)].

[0151] The strength of one side and the strength of the other side become the same, and the woven fabric of the glass fiber functions like a core material.

[0152] (Supplementary Note ε) A base [for example, the flat plate portion 10 of the left flat plate mold 1 shown in Figs. 5 and 6, the portion between one circumferential end and the other circumferential end of the arc-shaped sheet body], and A first end closer to the inner wall side than the base [for example, the wrap portion 22 of the left flat plate mold 1 shown in Figs. 5 and 6, one circumferential end of the arc-shaped sheet body], and A connecting portion connecting the base and the first end [for example, connecting portion 23], and The first end overlaps with a second end located on the side opposite to the inner wall side [for example, the end portion 15 of the right flat plate mold 1 shown in Figs. 5 and 6, the other circumferential end of the arc-shaped sheet body], and The mold described in Supplementary Note α or β is characterized in that at least at the boundary between the base and the connecting portion and at the boundary between the first end and the connecting portion, there are portions where the woven fabric of the glass fiber and the non-woven fabric of the glass fiber are overlapped and solidified with resin [for example, Figs. 5(A), 5(B), 6(A), 6(B)].

[0153] In addition, at least from the portion of the base portion on the connection portion side to the portion of the first end portion on the connection portion side, the woven fabric of the glass fiber and the non-woven fabric of the glass fiber may be overlapped and solidified with resin.

[0154] Further, the first end portion and the second end portion may be the end portions on one side and the other side of a common mold. That is, both end portions in the circumferential direction of a single arc-shaped mold are connected, the first end portion is the end portion on one side in the circumferential direction of the arc-shaped mold, and the second end portion may be the end portion on the other side in the circumferential direction of the arc-shaped mold.

[0155] Alternatively, the first end portion and the second end portion may be the end portions of different molds. That is, it is a mold connection body having a first mold and a second mold, the first mold and the second mold are connected, the first end portion is the end portion of the first mold on the second mold side, and the second end portion may be the end portion of the second mold on the first mold side.

[0156] The present invention can be variously modified within the scope described in the claims without being limited to the embodiments, modifications, and appendices described so far. For example, it is not limited to manholes for sewers, and can also be applied to manholes for water supply, transmission lines, communication lines, or gas pipes. Further, as the filling material, in addition to room temperature curable resins, heat curable resins, thermoplastic resins, or photo curable resins using a transparent mold may be used. Alternatively, as described above, the filling material is not limited to resins and may be grout materials or the like.

[0157] In addition, even if it is a constituent element included only in each of the descriptions of the embodiments, modifications, and appendices described above, the constituent element may be applied to the embodiments, other modifications, and appendices.

Explanation of Signs

[0158] M Manhole M4 rectangular part M4F front wall Mt top plate S filling space 1, 6 flat mold 2, 7 mold pieces 10 flat part 15 end 20 bifurcated part 21 covering part 22 wrapping part 23 connecting part 30 resin-supported sheet 30a one side surface 30b the other side surface GC glass roving cloth sheet GM chopped strand mat sheet

Claims

1. A mold connecting body having a first end portion and a second end portion that are connected to each other and cover the inner wall of a manhole from the inside while leaving a filling space between the inner wall and the inner wall, wherein the first end portion and the second end portion overlap each other, and the overlapping portion is adhered by resin, and the first end portion is provided with a resin supporting structure for supporting the resin. The mold connecting body is characterized by this.

2. The mold connecting body according to claim 1, wherein the resin is a resin resistant to hydrogen sulfide.

3. The resin supporting structure is a structure in which a resin support having a first surface located on the first end portion side and a second surface located on the second end portion side is fixed to the first end portion, and the resin support is provided with a communication space connecting from the first surface to the second surface. The mold connecting body according to claim 1 or 2 is characterized by this.

4. having a first mold, and a second mold, wherein the first mold and the second mold are connected, the first end portion is the end portion of the first mold on the second mold side, and the second end portion is the end portion of the second mold on the first mold side. The mold connecting body according to claim 1 or 2 is characterized by this.

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