JP6648387B2 - manhole - Google Patents

Description

  The present invention relates to a manhole with a spiral guideway.

  The spread of sewage sewage has progressed mainly in urbanized areas, but in recent years, for further spread, it has progressed to houses in urbanized control areas such as steep terrain and hills. The steps are getting bigger. When the head becomes large as described above, a method of performing a head processing by providing a spiral guide path in a manhole is adopted.

  And, as a head manhole with a spiral guide path, in a spiral flow type vertical water pipe having an outer cylinder part and a spiral part provided inside the outer cylinder part, a manhole tube is provided at the center of the spiral part. There is a vertical water pipe (for example, Patent Literature 1) in which a portion is provided and a window portion that can be visually recognized is provided in the cylindrical portion for a human hole.

  In addition, even when there are a plurality of inflow pipes connected to the manhole, in order to smoothly guide the fluid flowing into the vertical pipe to the spiral guide path, the plurality of inflow pipes may have a height difference on the upper pipe wall of the manhole. Are provided at the upper part of the vertical pipe body, corresponding to the respective inflow pipes, and the manhole is formed so that the fluid flowing down from the end of each inflow pipe flows into the vertical pipe body smoothly. There is proposed a vertical pipe inflow portion structure (for example, Patent Document 2) in which a guide wall that connects an inner surface and an outer surface of a vertical pipe main body and guides a fluid is erected on an upper slab to form an inflow portion. .

  In the above-mentioned vertical water pipe, unlike the conventional one, an excellent effect is obtained in that the worker entering the man-made hole can observe the water flow in the vertical water pipe through the window. Cleaning and repair work could not be performed sufficiently.

  Further, in the above-described structure of the inflow portion of the vertical pipe, even when there are a plurality of inflow pipes connected to the manhole, the fluid flowing into the vertical pipe can be smoothly guided to the spiral guide path. Since the vertical pipe having the guideway was arranged, the inside of the vertical pipe could not be cleaned and repaired.

JP 2015-166522 A JP 2008-190250 A

  It is an object of the present invention to provide a manhole that can perform cleaning and repair work on a manhole having a spiral portion.

According to a first aspect of the present invention, in a manhole of a spiral flow type including an outer cylinder portion and a spiral portion provided inside the outer cylinder portion, a ladder device including a plurality of pillar members is provided at the center of the spiral portion. The ladder device is provided with an open / close landing that closes an internal space of the ladder device in a closed state to serve as a scaffold and opens the internal space in an open state to be movable up and down. .

  The invention according to claim 2 is characterized in that a step is provided between the adjacent column members, and the step is formed such that the center side is located outside.

  The invention according to claim 3 is characterized in that the ladder device is provided with a lifting and lowering transportation means so as to be able to move up and down.

  The invention according to a fourth aspect is characterized in that the ladder device is provided with a conveyance means guiding portion for guiding the lifting / lowering conveyance means.

  The invention according to claim 5 is characterized in that a plurality of inflow pipes are connected to an upper portion, and a merging guide section that sends inflow water flowing from the plurality of inflow pipes to the spiral portion is provided.

  The invention according to claim 6, wherein a water landing section is provided at an upper portion, the water landing section includes a water landing outer cylinder section, and a water landing inner cylinder section provided inside the water landing outer cylinder section, The plurality of inflow pipes are connected to a tubular portion, and the landing inner tubular portion is divided in a length direction.

  The invention according to claim 7 is characterized in that it is provided with a partition part that partitions the spiral part and the ladder device.

  According to the configuration of claim 1, the ladder device can be used to move up and down the manhole, and at that time, the landing can be opened and moved up and down, while the landing is closed and used as a scaffold for cleaning and repair work. It can be performed.

  According to the configuration of the second aspect, it is possible to ascend and descend using the steps, and since the steps are formed so that the center side is located outside, it is possible to secure a wide internal space in the ladder device.

  According to the configuration of the third aspect, it is possible to put cleaned garbage, repair parts, and the like inside the hanging bucket and raise and lower the landing bucket in a state where the landing is opened.

  According to the configuration of claim 4, the hanging bucket can be stably moved up and down.

  According to the configuration of claim 5, a plurality of inflow pipes can be connected without separately providing a meeting manhole, and inflow water flowing from the plurality of inflow pipes can be sent to the spiral portion.

  According to the configuration of the sixth aspect, by dividing the inner landing section, the work in the landing section at the time of constructing the manhole becomes easy.

  According to the configuration of claim 7, the inflow water falling from the merging guide to the spiral portion does not scatter to the ladder device side, and the inflow water can be sent to the spiral portion.

1 is a cross-sectional view illustrating a first embodiment of the present invention. FIG. 2 is a cross-sectional view of FIG. FIG. 4 is a cross-sectional view of a part of a water landing part and a main body part according to the embodiment. It is an expanded sectional view of a spiral part same as the above, and describes the effect by overhang. It is an expanded sectional view of a spiral part same as the above. FIG. 2 is a cross-sectional view around the landing. FIG. 4 is a sectional view taken along line AA of FIG. 3. FIG. It is sectional drawing of a water landing part and an inlet part same as the above. It is sectional drawing explaining construction of a landing part same as the above. FIG. 4 is a sectional view taken along line BB of FIG. FIG. 4 is a sectional view taken along line CC of FIG. 3. FIG. 6 is a cross-sectional view illustrating a second embodiment of the present invention. FIG. 7 is a partially enlarged cross-sectional view showing a third embodiment of the present invention. It is sectional drawing of a principal part same as the above. FIG. 16A is a front view of a connecting plate, and FIG. 16B is a cross-sectional view in which the connecting plate is arranged on an outer surface side, showing a periphery of a concave-convex fitting portion showing a fourth embodiment of the present invention. FIG. 3 is a cross-sectional view in which the connecting plate is arranged on the inner surface side. It is sectional drawing of a water landing part and an inlet part same as the above. It is sectional drawing of the lower part side of an outer cylinder part same as the above. It is a plane sectional view of the important section showing Example 5 of the present invention. It is sectional drawing which expanded a part same as the above. It is sectional drawing of a principal part same as the above.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily indispensable requirements of the present invention.

  1 to 12 show a first embodiment, in which a manhole 1 which is a vertical water pipe is an assembling type manhole for assembling a secondary product, and a main body part 2, a water landing part 3, and people enter and exit from below. And an entrance portion 4 for performing the operation.

  As shown in FIGS. 1 and 2, the main body 2 includes an outer cylindrical portion 5 that receives an earth pressure, a spiral portion 6 provided inside the outer cylindrical portion 5 to configure a spiral guide path, A substantially cylindrical central through space 7 provided at the center of the portion 6, and the central axis of the central through space 7 is coaxial with the central axis of the outer cylindrical portion 5. The manhole 1 can be made of concrete.

  The outer cylinder part 5 is divided into a plurality of parts in the vertical direction, and divided outer cylinder parts 11, 11A, 12, 12A are overlapped and joined from below. The lower part of the lowermost divided outer cylinder part 11 is closed by a plate-shaped lower lid 13, and a short divided outer cylinder part 11 </ b> A is connected to the lowermost divided outer cylinder part 11. A plurality (two) of divided outer cylinder portions 12 and 12A are connected to the outer cylinder portion 11A. Further, a drain pipe 14 is connected to a side surface of the lowermost divided outer cylinder portion 11.

  A connection hole 14 </ b> A for connecting the drain pipe 14 is formed in the divided outer cylinder portion 11. The divided outer cylinder portions 11, 11A, 12, 12A are basic unit outer cylinder portions, and the manhole 1 is constructed by appropriately combining the basic unit outer cylinder portions.

  The spiral part 6 that forms a spiral flow is formed continuously on the inner surfaces of the divided outer cylinder parts 11A, 12, 12A. The spiral portion 6 has a spiral shape counterclockwise from top to bottom. As shown in FIGS. 4 and 5, the inner peripheral surface 16 of the spiral portion 6 is concentric with the inner peripheral surface 5 </ b> N of the outer cylindrical portion 5, and is separated from the inner peripheral surface 5 </ b> N of the outer cylindrical portion 5 by a certain distance. I have.

  In addition, the upper surface of the spiral portion 6 is a flow path, a substantially arc-shaped concave portion 17 is formed, and the inner upper surface portion 18 on the inner peripheral surface 16 side is formed higher than the height of the bottom of the concave portion 17, The inner upper surface 18 has a constant width. The lower surface of the spiral portion 6 is formed flat, and a vertically extending portion 19 which is an overhang is provided below the inner peripheral surface 16 side. An outer peripheral surface 19A of the vertically extending portion 19 is formed in a substantially arc shape. A lower portion of the outer peripheral surface 19A is formed outward and faces the inner peripheral surface 5N side. The central through space 7 is a space between the inner peripheral surfaces 16.

  As shown in FIG. 3 to FIG. 6 and the like, an uneven fitting portion 20 is provided on the joining end surface which is the upper and lower end surfaces of the divided outer cylindrical portions 11, 11A, 12, 12A. , An outer convex portion 21 is provided on the upper edge of the lower member, and an inner convex portion 22 is provided on the lower edge of the upper member, and the outer convex portion 21 and the inner convex portion 22 are fitted. Upper and lower members are connected and fixed by a connecting means (not shown) which straddles the uneven fitting portion 20 vertically. In addition, a water stopping process is performed between the joining end surfaces. Further, the outer protrusion 21 may be provided on the lower edge of the upper member, and the inner protrusion 22 may be provided on the upper edge of the lower member.

  At the position of the joining end face, there is provided a dividing part 6A obtained by dividing the spiral part 6. In the divided outer cylinder portion 11A, the spiral portion 6 is provided over a half circumference, and in the divided outer cylinder portions 12, 12A, the spiral portion 6 is provided over one circumference.

  A ladder device 8 is provided in the central through space 7, and the ladder device 8 is provided in the divided outer cylinder portions 11A, 12, 12A. The ladder device 8 has column members 24, 24, 24, 24 in four directions, and these column members 24, 24, 24, 24 are fixed to the inner peripheral surface 16 of the spiral portion 6 by fixing means (not shown). It is fixed. An example of the fixing means is an anchor bolt.

  Two opposing sides of a quadrangle formed by the four pillar members 24, 24, 24, 24 are elevating parts, and these elevating parts are provided with steps 26, 26,. The step 26 is made of a flat and arc-shaped bar, and both ends are fixed to the adjacent column members 24, 24. On the other hand, frame members 27 are provided at predetermined intervals in the vertical direction on the two sides other than the elevating portion, and this interval is wider than the interval of step 26. The frame member 27 is also formed in a circular arc shape in a plane similarly to the step 26, and both ends are fixed to the adjacent column members 24, 24.

  By forming the steps 26 and 26 and the frame members 27 and 27 in a substantially arc shape or a curved shape spreading outward, a large internal space of the ladder device 8 can be obtained. The steps 26, 26 and the frame members 27, 27 are formed such that their center sides are located outside.

A gap 28 is provided between the step 26 and the inner peripheral surface 16. By providing the gap 28 , a foot can be put on the step 26 close to the spiral portion 6 or the step 26 can be grasped by hand. be able to. For this reason, the curvature of the step 26 is larger than the curvature of the inner peripheral surface 16. The gap 28 is also provided between the frame member 27 and the inner peripheral surface 16.

  The ladder device 8 is provided with landings 31 at predetermined intervals. In this example, the landings 31 are provided at lower positions of the divided outer cylinder portions 12 and 12A. The landing 31 has a flat shape and a flat upper surface. As shown in FIG. 8, the outer periphery of the landing 31 is formed in a substantially arc shape or a curved shape following the steps 26, 26 and the frame members 27, 27.

  Further, one side of the landing 31 is rotatably attached to the frame 27 by a plurality of (two) pivot portions 32, 32, and a corresponding frame on the side of the landing 31 facing the pivot portion 32. A plurality of locking portions 33, 33 for locking on the material 27 are provided, and the landing portions 31 are horizontally held by locking the locking portions 33, 33 to the frame material 27. Further, since the pivot portions 32, 32 and the locking portions 33, 33 are provided below the landing 31 in the thickness direction, when the landing 31 is opened and raised as shown in FIG. Can be widely secured. The landing 31 may be attached to the step 26.

  As shown in FIG. 1, FIG. 2, FIG. 6, etc., the column members 24, 24, 24, 24 are divided at joint end surface positions which are upper and lower end surfaces of the divided outer cylindrical portions 11A, 12, 12A. . The spiral part 6 and the ladder device 8 are not provided in the lowermost divided outer cylinder part 11. By not providing the ladder device 8 in the lowermost divided outer cylinder portion 11 as described above, dust can be prevented from being caught on the column member 24 and the like.

  Next, the configuration of the water landing section 3 will be described. A disc-shaped partition plate 35 is provided below the water landing portion 3, and the lower surface of the partition plate 35 and the upper end surface of the divided outer cylindrical portion 12 are fitted by the concave-convex fitting portion 20. On the partition plate 35, a water landing outer cylinder portion 36 receiving earth pressure is provided, and an upper surface of the partition plate 35 and a lower end surface of the water landing outer cylinder portion 36 are fitted by the concave-convex fitting portion 20. Combine. The outer diameters of the divided outer cylinder portions 11, 11A, 12, 12A, the lower lid 13, the partition plate 35, and the landing cylinder 36 are substantially the same.

  A through hole 37 is provided at the center of the partition plate 35, and this through hole 37 communicates with the central through space 7 and has substantially the same diameter as the central through space 7. A landing inner tube portion 38 is provided in the landing outer tube portion 36, and the landing outer tube portion 36 and the landing inner tube portion 38 are arranged concentrically and have a double structure. The water landing inner cylinder 38 is provided in communication with the through hole 37, and stands upright on the partition plate 35. Further, the lower end surface of the inner landing water tube portion 38 and the inner edge of the through hole 37 on the upper surface of the partition plate 35 are fitted by the uneven fitting portion 20.

  The landing inner tube 38 is lower than the landing outer tube 36. As shown in FIG. 11 and the like, two horizontal inflow pipes 41 and 42 are connected to the water landing outer cylinder 36, and these inflow pipes 41 and 42 form an angle of 90 degrees in a plane. In addition, the water landing inner cylinder 38 is provided with lids 45 and 46 for inspecting holes 43 and 44 corresponding to the inflow pipes 41 and 42 and closing the holes 43 and 44. The lids 45 and 46 are detachably provided on the inner peripheral surface of the inner water landing tube 38 to open and close the holes 43 and 44.

  The inflow pipe 41 is larger in diameter than the inflow pipe 42. Further, connection holes 41A and 42A for connecting the inflow pipes 41 and 42 are formed in the outer landing tube portion 36. If the lids 45 and 46 are partially transparent, the inflow pipes 41 and 42 can be visually recognized.

  A concrete part 47 is formed by cast-in-place on the partition plate 35 between the water landing outer cylinder part 36 and the water landing inner cylinder part 38, and penetrates the concrete part 47 and the partition plate 35. A drop hole 48 is formed. As shown in FIG. 11 and the like, the drop hole 48 opens right below the inflow pipe 41 and has a substantially fan shape. In addition, the inflow pipe 42 is located on the spiral part 6 on the upstream side of the flow in the spiral part 6.

  On the upper surface of the concrete portion 47, the upper surface portion 49 on the inflow pipe 41 side is formed lowest, and the upper surface portion 49A on the anti-inflow tube 41 side is higher than the upper surface portion 49. An inclined upper surface portion 49B that becomes lower toward 49 is formed. In addition, a portion corresponding to the inflow pipe 42 is higher in the upper surface portion 49 of the concrete portion 47 than a portion corresponding to the inflow pipe 41.

  As described above, the merging guide portion 50 that sends the inflow water flowing from the inflow pipes 41 and 42 to the spiral portion 6 is configured by the outer landing portion 36, the inner landing portion 38, the concrete portion 47, and the drop hole 48. are doing. As shown in FIG. 12, the drop hole 48 is provided at an upper portion on the upstream side of the spiral portion 6, and specifically, is disposed at a position downstream from the upper end 6 </ b> J of the spiral portion 6. .

  The landing inner cylindrical portion 38 is vertically divided into two divided inner cylindrical portions 51 and 52, and the joint end faces of the divided inner cylindrical portions 51 and 52 are fitted by the concave / convex fitting portion 20. In addition, the length of the water landing inner cylindrical part 38 is 1000 mm or more, and is about 1200 mm in this example.

  A plurality of substantially U-shaped handrails 53 are provided in the water landing inner tube part 38 at intervals vertically, and the position of the handrails 53 corresponds to the plane position of the step 26. In addition, a handrail 53 is provided in the through hole 37 in correspondence with the handrail 53 of the landing inner tube portion 38. In addition, the handrail 53 is provided on the landing inner tube portion 38 and the partition plate 35 in a factory.

  An upper lid 54 is provided above the water landing outer cylinder 36, and the upper end surface of the outer cylinder 5 and the upper lid 54 are fitted by the uneven fitting portion 20. Further, a through hole 55 is formed in the center of the upper lid 54, and a ladder 56 is provided between the through hole 55 and the inner surface of the water landing inner cylinder 38.

  Next, a construction example of the water landing section 3 will be described. After connecting and fixing the outer cylinder part 5 on the partition plate 35, the inflow pipes 41 and 42 are connected to the connection holes 41A and 42A in a watertight manner. In this case, before installation of the landing inner tube portion 38, a work of filling a filler such as mortar between the connection holes 41A and 42A and the inflow pipes 41 and 42 is performed from the inside, so that the connection work is performed. It can be done easily.

  After the connection work of the inflow pipes 41 and 42 is completed, the lower divided inner cylindrical portion 52 is connected and fixed on the partition plate 35. Further, in this case, the worker can work while standing using the handrail 53 or the like, and the height of the divided inner cylinder portion 52 is 1000 mm or less, and in this example, 600 mm. The work can be performed by looking into the space between the water outer cylinder portion 36 and the divided inner cylinder portion 52, and the concrete portion 47 can be easily cast. Furthermore, if the water landing inner cylinder 38 is constructed by connecting the plurality of divided inner cylinders 51 and 52, the water landing inner cylinder 38 is higher than the inflow pipes 41 and 42. By entering the part 38, it does not get wet with sewage.

  After removing the formwork of the concrete part 47, the divided inner cylinder part 51 is connected and fixed on the divided inner cylinder part 52, and thereafter, the upper lid body 54 is fixed on the landing outer cylinder part 36, and the ladder 56 Is fixed.

  A connection straight wall tube 61 is connected and fixed on the upper lid 54, and the connection straight wall tube 61 communicates with the through hole 55. An oblique wall pipe 62 is connected to the connecting straight wall pipe 61, an adjusting ring 63 is connected to the oblique wall pipe 62, and an adjusting washer 64 is provided on the adjusting ring 63. A lid receiving frame 65 is provided on the top 64, and an opening / closing lid (not shown) for a manhole is provided on the lid receiving frame 65. A handrail 66 is provided on the inner peripheral surfaces of the connection straight wall pipe 61 and the inclined wall pipe 62, and the handrail 66 is provided corresponding to the position of the handrail 53.

  Below the partition plate 35, a plate-shaped baffle 71 serving as a partition portion is provided. The baffle 71 is formed in a plane arc shape so as to surround the ladder device 8 and is fixed to the spiral portion 6 by fixing means (not shown). From the upper end 6J of the spiral portion 6, the landing 31 of the divided outer cylinder portion 12A is formed. Up to the upper position. As shown in FIG. 12, a partition plate 71A serving as a partition is provided at the upper end 6J of the spiral portion 6, and the partition plate 71A is connected to the end of the baffle 71 and the inner peripheral surface of the landing cylinder 36. It is provided in the diameter direction so as to close the gap.

  Therefore, the sewage (inflow water) that has fallen from the fall hole 48 is guided onto the spiral portion 6 by the baffle 71 and the partition plate 71A. For this reason, it is preferable that the baffle 71 be provided in a range of 90 degrees or more in a plane.

  An upper end surface 72 of the baffle 71 is fixed to the partition plate 35 in a watertight manner, and a lower end surface 73 of the baffle 71 is formed following the inner upper surface portion 18, and is watertight on the inner upper surface portion 18. Fixed. The baffle 71 and the partition plate 71A are made of precast concrete, stainless steel or FRP.

  The drain pipe 14 is located on the opposite side of the inflow pipe 41 in the plane, and the lower end 6K of the spiral part 6 is located on the opposite side of the drain pipe 14. Further, a concrete invert 74 is provided on the upper surface of the lower lid 13, and the invert 74 guides water flowing down the spiral portion 6 to the drain pipe 14 side, and has a flat top portion 75. And a slope portion 76 which becomes lower from the top portion 75 toward the periphery. The top portion 75 is located on the side opposite to the drainage pipe 14 from the center of the lower lid 13, and the slope portion 76 is steep on the side opposite to the drainage pipe 14, and the slope of the slope on the side of the drainage pipe 14 is smaller than that on the opposite side of the drainage pipe 14. The degree is formed slowly.

As shown in FIG. 8, a hanging bucket 81 as a lifting / lowering means is provided in the ladder device 8 so as to be able to go up and down. The hanging bucket 81 has a bottomed box shape having a substantially square bottom surface portion 82 and side portions 83, 83, 83, 83 erected on four sides of the bottom surface portion 82 , and a hanging rope 84 is provided. Are linked.

  An elevating means (not shown) such as a crane is arranged on the ground outside the manhole 1, and a hook 86 provided on a hanging rope 85 of the elevating means is locked to the rope 84, and the elevating means The hanging bucket 81 can be moved up or down by winding or unwinding the hanging rope 81.

  The hanging bucket 81 is large enough to pass through the entrance 4 in a horizontal state, and the contaminants 101 in the lowermost divided outer cylinder 11 can be carried out by the hanging bucket 81 to the outside. The hanging bucket 81 may be moved up and down manually.

  Next, a method of constructing the manhole 1 will be described. An excavation hole 92 for installing the manhole 1 is excavated, and a foundation (not shown) is provided at the bottom of the excavation hole 92. In addition, as shown in FIG. 7, the plane shape of the excavation hole 92 is a square shape. The lower cover 13 is installed on the foundation, the divided outer cylinder 11 is joined onto the lower cover 13, and the drain pipe 14 is connected to the connection hole 14A in a watertight manner. Thereafter, the invert 74 made of precast concrete is mounted on the lower lid 13. The divided spiral part 6 and the ladder device 8 are attached to the divided outer cylinder parts 11A, 12, 12A in a factory or the like before loading into the site, and the divided outer cylinder parts 11A, 12, The main body 2 is constructed by sequentially stacking and joining 12A. A baffle 71 and a partition plate 71A are attached to the divided outer cylinder portion 12A in a factory or the like before being carried into the site. Further, the spiral portion 6 is also attached in a factory or the like before being carried into the site.

  After the main body 2 is constructed, the water landing section 3 is constructed as described above, the entrance section 4 is constructed on the water landing section 3, and the construction is completed or after the construction is completed. Backfill.

  In the manhole 1 constructed in this manner, when sewage such as rainwater flows in from the inflow pipes 41 and 42, it can be sent to the through hole 37 as one stream by the merging guide section 50 of the landing section 3. The sewage falling from the through-hole 37 falls on the spiral part 6 by the baffle 71 and the partition plate 71A, and falls as a spiral flow. Thus, the sewage before the spiral flow can be sent to the spiral part 6 by the baffle 71 and the partition plate 71A.

In addition, the baffle 71 and the partition plate 71A prevent sewage from being scattered to the upper portion of the ladder device 8, and the sewage is formed into a spiral flow by flowing through the spiral portion 6. Therefore, the sewage is almost scattered to the ladder device 8 below the baffle 71. I can't.

  The spiral flow has a substantially triangular shape on the spiral portion 6 and flows along the inner peripheral surface 5N in the case of the maximum water amount in the design. On the other hand, even when the amount of water is small, the provision of the concave portion 17 provides a smooth flow.

  As shown in FIG. 4, when the flow rate is large, the spiral flow becomes a flow along the inner peripheral surface 5 </ b> N between the upper and lower spiral portions 6, 6. Can prevent sewage from flying to the ladder device 8 side.

  The water landing section 3 is provided with inspection holes 43 and 44 and lids 45 and 46 for opening and closing the holes 43 and 44, so that the inflow pipes 41 and 42 can be maintained. .

  Further, since the upper part of the outer landing portion 36 is closed by the upper lid 54, and a gap is provided between the upper lid 54 and the upper end of the inner landing portion 38, the inner landing portion 38 and the lower landing portion are landed from the interval. The space between the outer cylinder 36 and the outer cylinder 36 can be visually checked.

  Then, in a state where the sewage flows, the worker can move up and down the inside of the manhole 1 by the ladder device 8 to perform cleaning, and as shown in FIG. By removing the impurities 101 and using the landing 31 at this time, work can be performed efficiently.

  When the impurities 101 are collected, the impurities 101 can be carried out using the hanging bucket 81.

  Since the lower part of the ladder device 8 is located higher than the invert 74 which is the bottom of the manhole 1, the impurities 101 are less likely to be caught by the lower part of the ladder device 8.

As described above, according to the present embodiment, in the spiral flow type manhole 1 including the outer cylindrical portion 5 and the spiral portion 6 provided inside the outer cylindrical portion 5, the spiral portion 6 A ladder device 8 having a plurality of column members 24 is provided at the center of the ladder device 8. The ladder device 8 is closed when the internal space of the ladder device 8 is closed. Since the open / close landing 31 is provided so as to be movable , the ladder device 8 can be used to ascend and descend in the manhole 1, open the landing 31 and move up and down, close the landing 31 and use it as a scaffold, Cleaning and repair work can be performed.

  As described above, in this embodiment, the step 26 is provided between the adjacent column members 24, 24, and the step 26 is formed so that the center side is located outside. The step 26 is formed so that the center side of the step 26 is located outside, so that a large internal space in the ladder device 8 can be secured.

  As described above, in this embodiment, the ladder device 8 is provided with the lifting bucket 81 serving as the lifting and lowering means so as to be able to ascend and descend, so that cleaned garbage and repair parts are put inside the lifting bucket 81. You can go up and down.

  As described above, in the present embodiment, the plurality of inflow pipes 41 and 42 are connected to the upper water landing section 3, and the inflow water flowing from the plurality of inflow pipes 41 and 42 is spirally formed. Since the merging guide section 50 for sending to the section 6 is provided, the plurality of inflow pipes 41 and 42 can be connected without separately providing a meeting manhole, and the inflow water flowing from the plurality of inflow pipes 41 and 42 can be connected. It can be sent to the spiral part 6.

  As described above, in the present embodiment, the water landing section 3 is provided at the upper portion according to the sixth aspect, and the water landing section 3 includes the water landing outer cylinder 36 and the water landing section provided in the water landing outer cylinder 36. The water landing inner tube 38 is provided with a plurality of inflow pipes 41 and 42 connected to the water landing outer tube 36 and the water landing inner tube 38 is divided in the length direction. , The work in the water landing section 3 at the time of constructing the manhole becomes easy.

  As described above, in the present embodiment, since the baffle 71 is provided as a partitioning part that separates the spiral part 6 and the ladder device 8 according to the seventh aspect, inflow water that falls from the merging guide part 50 into the spiral part 6 is provided. The inflow water can be sent to the spiral portion 6 without scattering to the ladder device 8 side.

  Hereinafter, as an effect of the embodiment, since the divided spiral portion 6 and the ladder device 8 are attached to the divided outer cylinder portions 11A, 12 and 12A in a factory or the like before construction, on-site construction is facilitated. In addition, since the concrete section 47 is cast after the lower divided inner cylinder portion 52 is installed and before the upper divided inner cylinder portion 51 is installed, the construction is facilitated.

  In addition, by providing the frame member 27 other than the elevating part, the safety of elevating can be secured. Further, since the ladder device 8 has four pillar members 24, 24, 24, 24, a wide space can be secured. Further, by providing a gap 28 between the step 26 and the inner peripheral surface 16, it is possible to put a foot on the step 26 or to grip the step 26 with a hand.

  Further, an upper end surface 72 of the baffle 71 is fixed to the partition plate 35 in a watertight manner, and a lower end surface 73 of the baffle 71 is formed following the inner upper surface portion 18 and is fixed to the inner upper surface portion 18 in a watertight manner. Further, since the partition plate 71A closes the gap between the end of the baffle 71 and the inner peripheral surface of the water landing outer cylinder 36, it is possible to prevent the sewage of the sewage falling into the drop hole 48 to the ladder device 8 side.

  Even if the amount of water is small, a smooth flow can be obtained by providing the concave portion 17 on the upper surface. Furthermore, when the spiral flow flowing through the spiral part 6 becomes a flow along the inner peripheral surface 5N between the upper and lower spiral parts 6, 6 and reaches the lower surface of the upper spiral part 6, the overhang function of the vertical part 19 causes The sewage is returned to the inner peripheral surface 5N side, and the sewage can be prevented from flying to the ladder device 8 side.

  FIG. 13 shows a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The manhole 1 of this embodiment has a water landing section 3. Instead, the inflow pipe 41 is connected to the uppermost divided outer cylindrical portion 12A of the main body 2, and a baffle 71 is provided corresponding to the inflow pipe 41.

  As described above, also in the present embodiment, the same operation and effect as those of the first embodiment can be obtained.

  Further, the baffle 71 and the partition plate 71A are provided corresponding to the inflow pipe 41, and the baffle 71 and the partition plate 71A prevent splashing of the inflow water into the ladder device 8.

  FIGS. 14 and 15 show a third embodiment of the present invention. The same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof will be omitted. The part 91 is provided in the ladder device 8.

  As shown in FIG. 14, the column member 24 of this example has a substantially cross-shaped cross section, and the inside of the column member 24 constitutes the transportation means guide portion 91. The conveyance means guide portion 91 has a shape corresponding to the corner portion 81K of the hanging bucket 81, and the conveyance means guide portions 91, 91 located diagonally from the interval between the corner portions 81K, 81K located diagonally of the hanging bucket 81. Are set widely.

  As described above, also in the present embodiment, the same operation and effect as those of the above-described embodiments are obtained.

  Further, in the present embodiment, since the ladder device 8 is provided with the transportation means guide portion 91 for guiding the hanging bucket 81 as the lifting and lowering transportation means, the lifting bucket 81 can be stably moved up and down. it can.

  Further, as an effect of the embodiment, the plurality of transporting means guides 91, 91, 91, 91 guide the hanging bucket 81 by sandwiching the side of the hanging bucket 81 at an interval. The tilting of the hanging bucket 81 is prevented, and stable lifting can be performed. Note that the transporting means guide portion 91 is provided on the entire length of the column member 24.

  FIGS. 16 to 20 show a fourth embodiment of the present invention, in which the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof will be omitted.

  16 shows the connecting means 110 on the outer surface side, and FIG. 17 shows the connecting means 110 on the inner surface side. An insert anchor 111 made of deformed reinforcing bars is embedded in upper and lower members provided with the outer convex portion 21 and the inner convex portion 22. are doing. The insert anchor 111 has a female screw portion 112 that opens to the outside and an anchor 113 in the cross direction provided integrally with the female screw portion 112, and these anchors 111 and 113 are made of deformed reinforcing bars or the like. The insert anchors 111 are connected to each other by a connecting plate 114, a bolt 115, and a washer 116. The connecting plate 114 is provided with a long hole 114A on both sides for inserting the bolt 115. The elongated hole 114A is vertically long.

  The ends of the members are abutted with each other, the bolt 115 is inserted through the washer 116 and the elongated hole 114A, and the upper and lower members are connected and fixed by screwing into the female screw portion 112.

  A plurality of the connecting means 110 are arranged at equal intervals in the circumferential direction. In this example, as shown in FIG. 20, four connecting means are provided at intervals in the circumferential direction. Further, the connecting means 110 on the side of the outer cylinder 5 has the connecting plate 114 arranged on the outer surface, and the connecting means 110 of the landing inner cylinder 38 having a smaller diameter than the outer cylinder 5 has the connecting plate 114 arranged on the inner surface. Construction in the water landing section 3 is facilitated.

  As shown in FIG. 18, insert anchors 111 are provided at the lower part of the water landing outer cylinder part 36, the partition plate 35, and the upper part of the divided outer cylinder part 12A, respectively. Are provided at three places, bolts 115, 115, 115 are inserted through the slots 114A, 114A, 114A, and these bolts 115, 115, 115 are screwed into the insert anchors 111, 111, 111, respectively. The lower part of the cylindrical part 36, the partition plate 35, and the upper part of the divided outer cylindrical part 12A are connected to a connecting plate 114 arranged on the outer surface, and the connecting means 110A for connecting the three places is used.

Further, as shown in FIG. 19, the lower part of the ladder device 8 is fixed to the inner peripheral surface 5N of the outer tubular portion 5 by a support 117, and the support 117 includes a plurality of diagonal members 118 fixed to the column member 24. And a horizontal fixing portion 119 fixed to a lower portion of the diagonal member 118, and the fixing portion 119 is fixed to the inner peripheral surface 5N of the outer cylindrical portion 5 by a plurality of insert anchors 111, bolts 115, washers 116 and the like. are doing. In this example, as shown in FIG. 19, a divided outer cylinder portion 11B in which the divided outer cylinder portions 11 and 11A of the first embodiment are integrally formed is used.

  As described above, also in the present embodiment, the same operation and effect as those of the above-described embodiments are obtained.

  FIGS. 21 to 22 show a fifth embodiment of the present invention, in which the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof will be omitted. In this example, the hanging bucket 81 is formed of vertical and horizontal gratings. The column member 24 is made of angle iron, and one side 24A of the column member 24 is attached to an attachment 121 having a substantially rectangular shape in a plane. The attachment 121 is attached to the inner peripheral surface 16 of the spiral portion 6 by the insert anchor 111 and the bolt 115. Fixed. Further, an end of the step 26 is fixed to the other side 24B of the column member 24, and an end of the frame member 27 is fixed to one side 24A of the column member 24. Further, the divided portions of the column member 24 are connected by a connecting member 120.

  In this example, the spiral portion 6 has a substantially L-shaped cross section, and the concave portion 17A of the spiral portion 6 has an outer peripheral surface 18G of a vertical wall portion 18T provided with an inner upper surface portion 18 and an inner peripheral surface of the outer cylindrical portion 5. It is formed between the surface 5N. Further, the spiral portion 6 is not provided with the hanging portion 19.

  As described above, also in the present embodiment, the same operation and effect as those of the above-described embodiments are obtained. Further, as in this example, a part of the concave portion 17A may be constituted by the inner peripheral surface 5N of the outer cylindrical portion 5.

  It should be noted that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention. For example, in the embodiment, the spiral part is provided integrally with the outer cylinder part at the factory, but it may be mounted on site or the ladder device may be mounted on site. Further, although the plurality of landings are of the pivot type, they may be opened and closed by attachment and detachment. Further, the shape of the hanging bucket may be other than square or circular. Further, the plane shape of the excavation hole 92 is not limited to the quadrangle shown in the embodiment, but may be a circle, an ellipse, a polygon having more than a pentagon, or a long hole having parallel two side walls between semicircular portions on both sides. , And may have a constant width in which both parallel side walls are continuous. The insert anchor 111 can be of various types other than deformed rebar, and the anchor 113 can be of various types other than deformed rebar.

1 manhole 2 main body 3 water landing section 5 outer cylinder section 6 spiral section (spiral guideway)
8 Ladder device 24 Column member 26 Step 27 Frame material 31 Landing 36 Water landing outer tube 38 Water landing inner tube
41, 42 Inflow pipe 50 Merging guide part 71 Baffle (partition part)
81 Hanging bucket (elevating and lowering means)
91 Transportation means guide

Claims (7)

In a spiral flow type manhole including an outer cylinder portion and a spiral portion provided inside the outer cylinder portion, a ladder device including a plurality of column members is provided at the center of the spiral portion, and the ladder device is closed. A manhole provided with an open / close landing that closes the internal space of the ladder device in a state and becomes a scaffold and opens the internal space in an open state to be movable up and down . The manhole according to claim 1, wherein a step is provided between the adjacent column members, and the step is formed such that a center side is located outside. The manhole according to claim 1 or 2, wherein an elevating / lowering means is provided on the ladder device so as to be able to ascend and descend. 4. The manhole according to claim 3, wherein the ladder device is provided with a conveyance means guiding portion for guiding the lifting / lowering conveyance means. The manhole according to any one of claims 1 to 4, wherein a plurality of inflow pipes are connected to an upper portion of the manhole, and a merging guide section that sends inflow water flowing from the plurality of inflow pipes to the spiral portion is provided. . A water landing portion is provided at an upper portion, the water landing portion includes a water landing outer cylinder portion, and a water landing inner cylinder portion provided in the water landing outer cylinder portion, and the plurality of inflows into the water landing outer cylinder portion. The manhole according to claim 5, wherein a pipe is connected, and the inner landing portion is divided in a length direction. The manhole according to claim 5, further comprising a partition part that partitions the spiral part and the ladder device.

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