JP2015071939A - Cylindrical form and renovation method for manhole inner wall surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a renovation method for manhole inner wall surface that renovates a manhole inner wall surface having deteriorated speedily at a low cost, and a form used therefor.SOLUTION: There is provided a cylindrical form 210 mounted on a straight wall part in a manhole while leaving a gap into which a grout material is injected with an inner wall surface of the manhole. One of a plurality of curved sheathing plates 211, 212, 213, 214, and 215 which are divided in a circumferential direction to be arcuately curved, and combined together to form a cylindrical shape is in such a wedge-like shape that when the plate is put in the manhole, the upper part is larger in size than the lower part, and parts, of the curved sheathing plate in the wedge-like shape, contacting two adjacent curved sheathing plates on the right and left sides are tapered in the direction of the cylinder axis.

Description

  The present invention relates to a rehabilitation method for a manhole inner wall surface that regenerates a deteriorated manhole inner wall surface at a manhole installation location, and a rehabilitation apparatus used therefor.

  Manholes generally have a concrete structure, and the inner wall surface of manholes may deteriorate due to corrosion over time due to long-term use or corrosive substances such as sulfuric acid caused by sulfur oxides in wastewater. is there.

  Conventionally, various rehabilitation methods for rehabilitating a deteriorated manhole inner wall surface are known.

  As a method for rehabilitating the inner wall of the manhole, for example, an anticorrosion sheet made of reinforced polyester resin or the like is attached to a deteriorated manhole inner wall, and the inside is supported by a split-type steel inner support frame. A sheet lining method has been put into practical use in which a grout material is injected into a gap between the anticorrosive sheet and the anticorrosion sheet, the grout material, and an existing manhole are integrated to line the inner wall surface of the manhole (see, for example, Non-Patent Document 1).

  Also, a lining material impregnated with thermosetting resin is inserted into an existing manhole, and this lining material is inflated with air pressure and attached to a deteriorated manhole inner wall surface. Then, the lining material is cured by a hot water circulation system, and the lining material A method of lining the inner wall surface of the manhole by integrating the existing manhole with the existing manhole has been put into practical use (for example, see Non-Patent Document 2).

  In addition, a self-supporting inner mold frame molded from polypropylene resin with excellent corrosion resistance is manufactured in a split type, this inner mold frame is assembled in a manhole, and grouted between the inner mold frame and the inner wall surface of the manhole. A construction method has been put to practical use in which a material is injected, and an inner mold frame, a grout material, and an existing manhole are integrated to rehabilitate the inner wall surface of the manhole (see, for example, Non-Patent Document 3).

"Rehabilitation method of sewer manhole-sheet lining method-SG-M method", [online], Shonan Synthetic Plastics Manufacturing Co., Ltd., [April 23, 2010 search], Internet <URL: http: // www. jiwet.jp/examination_proof/list/pdf/2008_0845.pdf> “SGICP-M Method”, [online], 3SICP Technology Association, [April 23, 2010 search], Internet <URL: http://www.3sicp.jp/construction/sgicp-m.html> “MLR Method”, [online], Clean Sogyo Co., Ltd. [Search April 23, 2010], Internet <URL: http://www.clean-s.jp/mlr.html>

  However, all of the above-mentioned construction methods require the use of expensive materials such as anticorrosion sheets made of reinforced polyester resin, lining material impregnated with thermosetting resin, inner molds molded with polypropylene resin, etc. As a result, the construction cost increases. In addition, the work of mounting the anticorrosion sheet and the work of assembling the split inner mold in the manhole are time-consuming work, and thus improvement has been desired.

  In view of the above circumstances, an object of the present invention is to provide a manhole inner wall rehabilitation method for rehabilitating a deteriorated manhole inner wall quickly and inexpensively, and a rehabilitation apparatus used therefor.

The rehabilitation method of the inner wall surface of the manhole of the present invention that achieves the above object is as follows.
Attach the cylindrical formwork to the lower end of the straight wall in the manhole with a gap from the inner wall of the manhole,
Injecting grout material into the gap between the cylindrical formwork and the inner wall surface of the manhole,
The grouting is repeated while pulling up the cylindrical form sequentially upward to form a lining layer over the entire straight wall,
After removing the cylindrical formwork,
A frustoconical formwork is mounted on the slant wall in the manhole with a gap from the inner wall of the manhole,
Injecting a grout material into the gap between the frustoconical formwork and the inner wall surface of the manhole to form a lining layer over the entire inclined wall portion,
Thereafter, the frustoconical formwork is removed.

  The method of rehabilitating the inner wall surface of the manhole according to the present invention is a cylindrical mold used when forming a lining layer made of a grout material over the entire straight wall portion, or when forming a lining layer made of a grout material over the entire oblique wall portion Since the truncated cone form to be used is a rehabilitation method of removing after forming the lining layer, the cylindrical form frame or the truncated cone form can be reused. Therefore, according to the method of rehabilitating the inner wall surface of the manhole of the present invention, an expensive synthetic resin sheet or the like that is left integrated with the existing manhole is not required, and the deteriorated manhole inner wall surface can be rehabilitated quickly and inexpensively. .

  Here, in the method for rehabilitating the inner wall surface of the manhole according to the present invention, a material having acid resistance may be used as the grout material. In recent years, special mortar materials with high acid resistance, excellent initial hardness development, and excellent long-term strength development have been developed. By using such materials, durability in the internal environment of manholes has been developed. It is possible to form an excellent wall surface and to eliminate the need for a synthetic resin sheet or the like.

  Moreover, in the rehabilitation method of the inner wall surface of the manhole of the present invention, a synthetic resin sheet or the like can be made unnecessary by using a material to which an antibacterial agent or an antibacterial agent is added as the grout material. As the antibacterial agent or antibacterial agent, for example, an organic agent such as thiabendazole, nickel metal or the like, or an antibacterial metal ion-carrying inorganic powder can be used.

  Moreover, in the rehabilitation method of the inner wall surface of the manhole of the present invention, a synthetic resin sheet or the like can be made unnecessary by applying a photocurable resin to the surface of the lining layer.

  By using such a grout material with acid resistance, or a grout material to which antibacterial or antibacterial agents are added, or a coating material, the inner wall surface of the manhole is highly durable and the deterioration of the inner wall surface of the manhole is sufficiently prevented. Therefore, the preferred rehabilitation of the inner wall surface of the manhole can be achieved.

  Further, the first rehabilitation device of the manhole inner wall rehabilitation device of the present invention that achieves the above object is a cylindrical assembly form consisting of a rigid curved plate-like plate whose circumference is divided into a plurality, and this cylinder And a pulling device for pulling up the mold assembly formwork in the manhole.

  According to the first rehabilitation device of the manhole inner wall rehabilitation device of the present invention, by disassembling the cylindrical assembly form, the cylindrical assembly form can be easily put in and out from the opening of the manhole.

  Here, the first rehabilitation device of the rehabilitation device for the inner wall surface of the manhole according to the present invention is configured such that one of the curved plate-like platen plates has a cylindrical axial taper at a contact portion between the adjacent curved plate-like platen plates. If provided, the assembly and disassembly of the cylindrical assembly form is easy and preferable.

  A second rehabilitation device for manhole inner wall rehabilitation device according to the present invention that achieves the above object is a cylindrical form frame made of a flexible plate having a circumference divided into one or two parts. The division joint portion of the mold has a positioning and fixing structure.

  The “positioning and fixing structure” referred to in the present invention is a structure in which the divided end portions of the divided joint portion of the flexible plate are abutted and the divided end portions are positioned and fixed to each other. For example, a connection structure by engagement between a pin and a pin hole, a structure in which opposing protrusions provided on both sides of the divided end portion are integrated with each other, a structure including a flange and a bolt and nut that couples the flange and the like may be used.

  According to the second rehabilitation device of the manhole inner wall rehabilitation device of the present invention, the cylindrical formwork can be wound to a small diameter, and thereby the cylindrical formwork can be easily taken in and out from the opening of the manhole. it can. Further, the cylindrical formwork can be held in a desired shape by the positioning and fixing structure.

  A third rehabilitation device for manhole inner wall rehabilitation device of the present invention that achieves the above object is a frustoconical form consisting of a flexible plate having one or more circumferences. The division joint portion of the mold has a positioning and fixing structure.

  According to the third rehabilitation device of the manhole inner wall rehabilitation device of the present invention, the frustoconical formwork can be wound to a small diameter, and thus the frustoconical formwork can be easily put in and out from the opening of the manhole. it can. Further, the frustoconical formwork can be held in a desired shape by the positioning and fixing structure.

  The present invention can also be expressed as follows.

That is, the cylindrical form of the present invention is
A cylindrical formwork that is mounted on a straight wall portion in a manhole with a gap through which grout material is injected between the inner wall surface of the manhole,
A plurality of curved plate-shaped plates that are divided into a plurality of portions in the circumferential direction and each bend in an arc shape to form a cylindrical shape by combination, and an upper portion when one of the plurality of plates is placed in a manhole Has a wedge shape larger than the size of the lower portion, and a contact portion with two curved plate-like plate adjacent to the left and right sides of the curved plate-like plate having the wedge shape is formed in a cylindrical axial taper. It is characterized by.

  Here, in the cylindrical formwork of the present invention, the two curved plate-like dams adjacent to the left and right are urged toward each other by a spring member having ends fixed to both sides. preferable.

Moreover, the rehabilitation method of the inner wall surface of the manhole of the present invention is
The plurality of curved plate shaped plates constituting the cylindrical form of the present invention are inserted into a manhole and assembled into a cylindrical shape, and the assembled cylindrical form is placed under the manhole straight wall, Install with a gap between the wall and
A lining layer is formed by injecting and curing a grout material between the cylindrical formwork and the inner wall surface of the manhole,
The curved plate-shaped weir plate having the wedge shape constituting the cylindrical formwork is pulled up to such an extent that the diameter of the cylindrical formwork is reduced,
Moving the cylindrical formwork in a state where the curved plate-shaped weir plate having the wedge shape is lifted;
By enlarging the diameter of the cylindrical formwork by pushing down the curved plate-shaped weir having the wedge shape,
The lining layer is extended upward by injecting a grout material between the cylindrical formwork and the inner wall surface of the manhole and curing it.

  According to the method of rehabilitating the inner wall of the manhole according to the present invention, it is not necessary to use an expensive synthetic resin sheet or the like that is left integrated with the existing manhole as in the prior art, the construction is easy, and the deteriorated inner wall of the manhole is removed. Rehabilitation can be done quickly and inexpensively. Further, by using a rehabilitation apparatus that can be used repeatedly, the inner wall surface of the manhole can be rehabilitated in a simple, inexpensive and short construction period.

It is a schematic block diagram which shows the Example of the rehabilitation method of a manhole inner wall surface of this invention, and a 1st rehabilitation apparatus. It is the perspective view which looked at the cylindrical formwork shown in FIG. 1 from diagonally upward. It is the perspective view which looked at the cylindrical form frame of the state which pulled up upwards one curved plate shaped weir of the 5 curved plate shaped plates shown in FIG. FIG. 3 is a plan view of a cylindrical mold formed by dividing five curved plate-shaped dams shown in FIG. 2. It is a schematic block diagram which shows the Example of the cylindrical formwork which comprises the 2nd renovation apparatus of the inner wall surface of the manhole of this invention. It is a top view which shows the positioning fixing structure in the cylindrical formwork shown in FIG. It is a schematic block diagram which shows the Example of the rehabilitation method of the inner wall surface of the manhole of this invention, and a 3rd rehabilitation apparatus. It is an enlarged view of the A section shown in FIG. It is the perspective view which looked at the truncated-conical formwork shown in FIG. 7 from diagonally upward. It is a longitudinal cross-sectional view of the manhole explaining the renovation process of the upper surface of an invert, and the lower part of a straight wall part.

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

  FIG. 1 is a schematic configuration diagram showing an embodiment of a manhole inner wall rehabilitation method and a first rehabilitation apparatus 200 according to the present invention. 2 is a perspective view of the cylindrical form 210 shown in FIG. 1 as viewed obliquely from above. FIG. 3 shows the five curved plate-like plates 211, 212, 213, 214, shown in FIG. FIG. 4 is a perspective view of a cylindrical form 210 in a state in which one curved plate-shaped dam plate 211 of 215 is lifted upward, and FIG. 4 is a view showing five curved plate shapes shown in FIG. It is a top view of the cylindrical formwork 210 formed by dividing the weir plates 211, 212, 213, 214, 215.

  A first rehabilitation apparatus 200 shown in FIG. 1 is used to rehabilitate a straight wall portion 120 in a manhole 100, for example, a steel cylindrical form 210, and is suspended by suspension ropes 223 and 224 such as chains or wire ropes. And a lifting device 220 installed on the manhole 100, which is lifted and moved upward.

  The cylindrical form 210 has a cylindrical shape composed of rigid curved plate-like plates 211, 212, 213, 214, and 215 having a circumference divided into five so as to be inserted into the manhole 100 from the opening 110 of the manhole 100. It is an assembly formwork. Of these five curved plate-like plates 211, 212, 213, 214, and 215, one curved plate-like plate 211 has a wedge shape. More specifically, when the curved plate-shaped weir plate 211 having this wedge shape is placed in the manhole 100, the upper dimension is larger than the lower dimension, and the curved plate-shaped weir plate having this wedge shape is used. The contact portions with the curved plate-like dam plates 212 and 215 adjacent to 211 are provided with cylindrical axial direction tapers 2111 and 2112. Further, even if the curved plate-like weir plates 212 and 215 adjacent to the bent plate-like weir plate 211 having a wedge shape are biased toward each other by the spring member 216 having both ends fixed to each other. Good.

  As described above, when one of the five curved plate-like plates 211, 212, 213, 214, and 215 has a wedge shape, five curved plate-like plates are formed. Assembly and disassembly of the dams 211, 212, 213, 214, 215 are facilitated.

  The outer diameter of the cylindrical form 210 is smaller than the inner diameter of the straight wall portion 120 in the manhole 100 by an amount corresponding to the grout allowance for injecting the grout material 510 (here, about 15 mm as an example). . In addition, the height of the cylindrical formwork 210 is determined in consideration of the handleability of the steel curved plate-like plates 211, 212, 213, 214, 215, rehabilitation workability using the cylindrical formwork 210, and the like. For example, about 600 mm.

  The pulling device 220 includes a tripod 221 and a pulley 222, for example. The pulling device 220 inserts the cylindrical formwork 210 into the manhole 100, supports the suspension and discharges it, and moves the cylindrical formwork 210 sequentially upward as the grout material 510 is injected and cured. It is.

  FIG. 5 is a schematic configuration diagram showing an embodiment of the cylindrical form 310 constituting the second rehabilitation device for the inner wall surface of the manhole according to the present invention. FIG. 6 is a plan view showing a positioning and fixing structure 330 in the cylindrical mold 310 shown in FIG.

  The combination of the cylindrical form 310 shown in FIG. 5 and the pulling device 220 shown in FIG. 1 is the second rehabilitation device. This second rehabilitation apparatus is another embodiment of the first rehabilitation apparatus 200 described with reference to FIGS.

  The cylindrical form 310 is used for rehabilitation of the straight wall portion 120 (see FIG. 1) in the manhole 100, which is made of a flexible plate made of, for example, synthetic resin, whose circumference is divided into one. In the cylindrical form 310, the split joint portion 320 includes a positioning and fixing structure 330. The positioning and fixing structure 330 is a structure in which the split end portions 321 and 322 of the split joint portion 320 of the flexible plate are abutted and the split end portions 321 and 322 are positioned and fixed to each other. Here, the positioning fixing structure 330 is a protrusion formed at a position facing the protrusion 331 of the protrusion 331 formed on one split end 321 of the split joint part 320 and the other split end 322. It is comprised from the hole 332 engaged with 331. FIG. The cylindrical form 310 is held in a desired shape by engaging the projection 331 of the positioning and fixing structure 330 with the hole 332.

  Since such a cylindrical form 310 is made of a flexible plate, it can be inserted into and discharged from the opening 110 of the manhole 100 with a small diameter.

  The outer diameter of the cylindrical form 310 is smaller than the inner diameter of the straight wall portion 120 in the manhole 100 by an amount corresponding to the grout allowance for injecting the grout material 510 (about 15 mm as an example here). . In addition, the height of the cylindrical form 310 is set to, for example, about 600 mm in consideration of handleability, rehabilitation workability using the cylindrical form 210, and the like.

  FIG. 7 is a schematic block diagram showing an embodiment of the method for rehabilitating the inner wall surface of the manhole and the third rehabilitation apparatus 400 according to the present invention, and FIG. 8 is an enlarged view of part A shown in FIG. FIG. 9 is a perspective view of the frustoconical form 410 shown in FIG. 7 as viewed obliquely from above.

  A third rehabilitation device 400 shown in FIG. 7 includes a frustoconical form 410 used for rehabilitation of the inclined wall portion 130 in the manhole 100 and a pulling device 220 installed on the manhole 100. The lifting device 220 shown in FIG. 7 is the same lifting device as the lifting device 220 shown in FIG.

  The frustoconical form 410 is made of a flexible plate made of, for example, synthetic resin, whose circumference is divided into one. In the truncated conical mold 410, the split joint portion 420 includes a positioning and fixing structure 430. The positioning and fixing structure 430 is the same structure as the positioning and fixing structure 330 shown in FIG. 6, and includes a projection 431 formed on one split end 421 of the split joint portion 420 and the other split end 422. And a hole 432 that engages with the protrusion 431 and is formed at a position facing the protrusion 431. The frustoconical form 410 is held in a desired shape by engaging the protrusion 431 of the positioning and fixing structure 430 with the hole 432.

  The frustoconical form 410 is made of a flexible plate, and can be inserted into and discharged from the opening 110 of the manhole 100 with a small diameter.

  In addition, a cylindrical portion 440 is formed at the lower part of the frustoconical form 410. The cylindrical portion 440 has an outer diameter slightly smaller than the inner diameter of the upper end inner wall portion 511 of the lining layer made of the grout 510 material formed on the entire surface of the straight wall portion 120 in the manhole 100. In addition, a sponge 710 that protrudes downward from the lower end of the cylindrical portion 440 and has an outer diameter of the protruding portion substantially equal to the inner diameter of the upper end inner wall portion 511 is attached to the lower portion of the inner surface of the cylindrical portion 440. .

  The sponge 710 attached to the lower surface of the inner surface of the cylindrical portion 440 of the frustoconical form 410 is positioned on the upper inner wall portion 511 of the lining layer made of the grout 510 material formed on the entire surface of the straight wall portion 120 in the manhole 100. For example, the expansion band 600 is expanded from the inner surface side of 710, and the sponge 710 is pressed against the upper end inner wall portion 511, whereby leakage of the grouting material 510 from the lower part of the frustoconical form 410 during injection of the grouting material 510 is prevented. More specifically, the expansion band 600 is a belt-like member that can be wound and expanded. For example, an insertion end fixing portion 610 is formed at one end. In an upper end inner wall portion 511 of the lining layer formed on the entire surface of the straight wall portion 120, the expansion band 600 is expanded from the inner surface side of the sponge 710 attached to the lower surface of the inner surface of the cylindrical portion 440 of the frustoconical form 410. By inserting and fixing the other end (insertion end) to the insertion end fixing portion 610, the sponge 710 is pressed against the upper end inner wall portion 511, and the sponge 710 is in close contact with the upper end inner wall portion 511.

  The outer diameter of the truncated conical mold 410 is smaller than the inner diameter of the inclined wall portion 130 in the manhole 100 by an amount corresponding to the grout allowance for injecting the grout material 510 (about 15 mm as an example here). . Further, the height of the frustoconical form 410 is determined according to the height of the inclined wall portion 130 in the manhole 100.

  Next, the Example of the rehabilitation method of the inner wall surface of the manhole of this invention is described. Here, a rehabilitation method using the first rehabilitation apparatus 200 described with reference to FIGS. 1 to 4 and the third rehabilitation apparatus 400 described with reference to FIGS.

  First, all the steps (not shown) in the manhole 100 are cut using, for example, a sander so that the manhole inner wall surface 101 has no protrusions. Further, the portion of the manhole inner wall surface 101 where the concrete has deteriorated is scraped and washed with water or with high-pressure water.

  Next, the grout material 510 at the time of pouring the grout material 510 is placed below the straight wall 120 in contact with the upper surface 141 of the invert 140 in the manhole 100, that is, on the portion where the cylindrical form 210 is installed on the bottom surface of the manhole 100. For example, a sponge 700 having a width of about 3 cm to 5 cm for preventing leakage is pasted over the entire circumference.

  Next, five curved plate-like plates 211, 212, 213, 214, and 215, which are formed by dividing a cylindrical cylindrical mold 210 made of, for example, steel used for rehabilitation of the straight wall portion 120, are placed on the manhole 100. It is hung on the pulley 222 of the installed lifting device 220 by the suspension ropes 223 and 224 and inserted into the manhole 100, and the five bent plate-like plates 211, 212, 213, 214 and 215 are assembled into a cylindrical shape. At this time, of the five curved plate-like plates 211, 212, 213, 214, and 215 constituting the cylindrical mold 210, one curved plate-like plate 211 having a wedge shape is set to the upper dimension. Assemble in a direction that is larger than the lower dimension. Thereafter, a cylindrical form 210 formed by assembling five curved plate-like plates 211, 212, 213, 214, and 215 is sandwiched between the lower end of the straight wall portion 120 and the sponge 700 and the inner wall surface 101 of the manhole. And, for example, with a gap of about 15 mm. Here, the inner wall surface of the manhole at the upper end portion of the cylindrical mold 210 is maintained so that the gap between the cylindrical mold 210 and the inner wall surface 101 of the manhole, that is, the grout allowance for injecting the grout material 510 is maintained at about 15 mm. The cylindrical formwork 210 is positioned by, for example, sandwiching five spacers 800 in the gap with 101.

  Next, a grout material 510 having acid resistance is injected into the gap between the cylindrical mold 210 and the inner wall surface 101 of the manhole from the grout material injection section 500 and cured to form a lining layer made of the grout 510 material. In addition, you may put the mesh member made from steel or synthetic fiber which is not shown in figure as reinforcement of the grout material 510 in this clearance gap. The grout material 510 is preferably a material having acid resistance, but may be a material to which a bactericide or an antibacterial agent is added. Alternatively, a material made of a normal cement-based solidifying material may be used as the grout material 510, and a photocurable resin may be applied to the surface of the lining layer as an anticorrosion coating material after the lining layer is formed with the normal cement-based solidifying material. By using such a grout material having acid resistance, or a grout material to which an antibacterial or antibacterial agent is added, or a coating material, the manhole inner wall surface 101 is rich in durability, and the manhole inner wall surface 101 is sufficiently deteriorated. Therefore, the preferred rehabilitation of the manhole inner wall surface 101 can be achieved.

  Next, when the grout material 510 injected into the gap is cured, one of the five curved plate-like plates 211, 212, 213, 214, 215 constituting the cylindrical mold 210 has a wedge shape. The curved plate-like dam plate 211 is suspended from the pulley 222 of the lifting device 220 by the suspension ropes 223 and 224 and pulled up to the extent that the diameter of the cylindrical mold 210 is reduced. The curved plate-like weir plates 212 and 215 adjacent to the curved plate-like weir plate 211 having a wedge shape are urged toward each other by a spring member 216 whose ends are fixed to both. For this reason, when the curved plate-like weir plate 211 having a wedge shape is pulled upward, the diameter of the cylindrical mold 210 is reduced by the biasing force. Thereafter, the cylindrical formwork 210 is suspended from the pulley 222 of the lifting device 220 by the suspension lines 223 and 224, and is lifted and moved upward until it is positioned above the lining layer formed in the previous step, and again. The cylindrical form 210 is assembled into a cylindrical shape.

  Thereafter, the grouting material 510 is injected into the gap between the cylindrical formwork 210 and the manhole inner wall surface 101 and the cylindrical formwork 210 is lifted and moved, and the lining layer made of the grout 510 material is applied to the entire surface of the straight wall portion 120. Form.

  Next, of the five curved plate-like plates 211, 212, 213, 214, and 215 constituting the cylindrical mold 210, one curved plate-like plate 211 having a wedge shape is pulled up. The pulleys 223 and 224 are suspended from the pulleys 220 of the 220 and pulled upward, and the remaining four curved plate-like plates 212, 213, 214, and 215 are divided, and they are divided into the pulleys 222 of the lifting device 220. It is suspended from the manhole 100 by being suspended by the suspension ropes 223 and 224.

  Next, a conical trapezoidal frame 410 made of a flexible plate made of, for example, synthetic resin, which is used for rehabilitation of the inclined wall portion 130, is formed on the manhole 100. The suspension device 223 is suspended from the pulley 222 of the pulling device 220 and inserted into the manhole 100, and the frustoconical form 410 wound around a small diameter is expanded. In addition, the protrusion 431 formed on one divided end 421 of the truncated conical mold 410 is engaged with the hole 432 formed on the other divided end 422 so as to be held in a truncated cone shape. The frustoconical form 410 held in the frustoconical shape in this way is attached to the inclined wall portion 130 with a gap of, for example, about 15 mm from the manhole inner wall surface 101. More specifically, the sponge 710 attached to the lower part of the inner surface of the cylindrical portion 440 of the truncated cone-shaped mold 410 held in the truncated cone shape is applied to the upper end inner wall portion 511 of the lining layer formed on the entire surface of the straight wall portion 120. Position. Thereafter, for example, the expansion band 600 is expanded from the inner surface side of the sponge 710, and the sponge 710 is pressed against the upper end inner wall portion 511. Thereby, leakage of the grout material 510 from the lower part of the truncated conical mold 410 during the injection of the grout material 510 is prevented.

  Next, a grout material 510 having acid resistance is injected from the grout material injection section 500 into the gap between the frustoconical formwork 410 and the manhole inner wall surface 101 and cured, and the inner surface of the slant wall section 130 is made of the grout 510 material. Form a tension layer.

  Next, when the grout material 510 injected into the gap is hardened, the expansion band 600 expanded from the inner surface side of the sponge 710 attached to the lower portion of the inner surface of the cylindrical portion 440 of the frustoconical form 410 is wound, and this is wound around the manhole. Remove outside 100. After that, the engagement between the projection 431 and the hole 432 in the truncated conical mold 410 is released, the truncated conical form 410 is wound to a small diameter, and this is suspended on the pulley 222 of the lifting device 220 by the suspension lines 223 and 224. And remove it outside the manhole 100.

  FIG. 10 is a longitudinal sectional view of the manhole 100 for explaining the rehabilitation process of the upper surface 141 of the invert 140 and the lower portion of the straight wall portion 120.

  After the frustoconical form 410 is removed, the sponge 700 attached to the lower portion of the straight wall portion 120 in contact with the upper surface 141 of the invert 140 in the manhole 100 is removed, and the upper surface 141 of the invert 140 and the lower portion of the straight wall portion 120 are removed. A mortar 520 having acid resistance is troweled and finished.

  Finally, a step (not shown) is attached to the manhole inner wall surface 101.

  As described above, the method for rehabilitating the inner wall surface of the manhole in the present embodiment is the cylindrical mold 210 used when forming the lining layer of the grout material 510 on the entire surface of the straight wall portion 120 in the manhole 100, and the slant in the manhole 100. This is a rehabilitation method in which the frustoconical form 410 used when forming the lining layer of the grout material 510 on the entire surface of the wall 130 is removed after the lining layer is formed. Therefore, the cylindrical form 210 and the frustoconical form 410 Can be reused. Therefore, according to the rehabilitation method of the inner wall surface of the manhole of the present embodiment, it is not necessary to use an expensive synthetic resin sheet or the like that is left integrated with the existing manhole as in the prior art, and the deteriorated manhole inner wall surface 101 can be quickly removed. It can be rehabilitated at low cost. Further, by using the rehabilitation devices 200 and 400 that can be used repeatedly, the manhole inner wall surface 101 can be rehabilitated in a simple, inexpensive and short construction period.

DESCRIPTION OF SYMBOLS 100 Manhole 101 Manhole inner wall surface 110 Opening part 120 Straight wall part 130 Slanted wall part 140 Invert 141 Upper surface 200 1st renovation apparatus 210 Cylindrical form 211,212,213,214,215 Curved plate-like crests 2111,2112 Cylinder Axial taper 216 Spring member 220 Lifting device 221 Tripod 222 Pulley 223, 224 Suspension rope 310 Cylindrical form 320 Divided joint portion 321, 322 Divided end portion 330 Positioning fixing structure 331 Protrusion 332 Hole 400 Third regenerator 410 Conical Trapezoidal mold 420 Split joint portion 421, 422 Split end portion 430 Positioning and fixing structure 431 Projection 432 Hole 440 Cylindrical portion 500 Grout material injection portion 510 Grout material 511 Upper end inner wall portion 520 Mortar 600 Expansion band 610 Insertion end fixing portion 700 710 sponge 800 spacer

Claims (3)

A cylindrical formwork that is mounted on a straight wall portion in a manhole with a gap through which grout material is injected between the inner wall surface of the manhole,
A plurality of curved plate-shaped plates that are divided into a plurality of portions in the circumferential direction and each bend in an arc shape to form a cylindrical shape by combination, and an upper portion when one of the plurality of plates is placed in a manhole Has a wedge shape larger than the size of the lower portion, and a contact portion with two curved plate-like plate adjacent to the left and right sides of the curved plate-like plate having the wedge shape is formed in a cylindrical axial taper. A cylindrical formwork characterized by   2. The cylindrical formwork according to claim 1, wherein the two bent plate-like crests adjacent to each other on the right and left are urged toward each other by a spring member having ends fixed to both sides. . The plurality of curved plate-like dams constituting the cylindrical formwork according to claim 1 or 2 are inserted into a manhole and assembled into a cylindrical shape, and the assembled cylindrical formwork is placed under the manhole straight wall portion, Install with a gap between the inner wall of the manhole,
A lining layer is formed by injecting and curing a grout material between the cylindrical formwork and the inner wall surface of the manhole,
The curved plate-shaped weir plate having the wedge shape constituting the cylindrical formwork is pulled up to such an extent that the diameter of the cylindrical formwork is reduced,
Moving the cylindrical formwork in a state where the curved plate-shaped weir plate having the wedge shape is lifted;
By enlarging the diameter of the cylindrical formwork by pushing down the curved plate-shaped weir having the wedge shape,
A method for rehabilitating an inner wall surface of a manhole, wherein a grouting material is injected between the cylindrical formwork and the inner wall surface of the manhole to harden the lining layer upward.

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