JP2017020191A - Earthquake resistant structure in connection part of manhole sidewall and pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly execute an expansion in an expansion part of an earthquake resistant joint, by executing breaking of thin mortar of a backup material side surface in the whole periphery of a rehabilitation pipe, in an earthquake resistant structure that is composed of the rehabilitation pipe for lining by being inserted into a pipe of an existing pipe connected to a manhole sidewall, a flange part fastened by being applied to an inside surface of the manhole sidewall, a tubular part fastened by being out-fitted to a pipe end part of the rehabilitation pipe of projecting from the existing pipe, a flexible earthquake resistant joint having an expansion part formed between the flange part and the tubular part, an expandable ring-shaped backup material installed around the pipe end part of the rehabilitation pipe adjacently to the expansion part of the joint, and mortar placed by covering the earthquake resistant joint and the backup material, and that thins the mortar for covering a backup material side surface.SOLUTION: The edge of upper-lower mortars is cut in an invert 54 adjacent to thin mortar 43a, and the mortar and a nonadhesive sheet 47 are buried, and a motor surface layer part 58 on the sheet is easily separated.SELECTED DRAWING: Figure 7

Description

  The present invention is a seismic structure using a seismic joint at a connecting portion between a pipe such as a sewer pipe (hereinafter simply referred to as a pipe, and therefore the pipe referred to in the present invention refers to a sewer pipe or the like) and a manhole side wall. About.

  FIG. 1 shows an earthquake-resistant structure disclosed in Patent Document 1 in which an existing connection portion between a pipe and a manhole side wall is made earthquake resistant. As shown in FIG. 2, the construction is performed between the manhole side wall 1 and the existing pipe 2. At the connecting portion, the manhole side wall 1 around the existing pipe 2 is removed with the existing pipe 2 and the invert 3 together with the required portions of the existing pipe 2 and the invert 3 leaving a part to the vicinity of the outer peripheral surface, and then renovated from the manhole into the existing pipe 2 The tube 4 is inserted and lined, and then the protruding portion of the welfare tube 4 into the manhole is cut flush with the inner surface of the manhole, and then the hole formed in the manhole side wall on the outer periphery of the rehabilitation tube protruding from the existing tube 2 A rubber or resin elastically deformable seismic joint 5 made of rubber or resin is loaded into an annular gap, and then a concave chip portion of the invert 3 is filled with a filler 6 made of an elastic material, and a step with the rehabilitation pipe 4 To mole It is performed by forming the arcuate groove shaped flow path that reaches the rehabilitating pipe 4 to fill the Le 7. FIG. 1 shows a cross-sectional structure after construction, and the relative movement between the rehabilitation pipe 4 and the manhole 1 when an earthquake occurs is absorbed by the earthquake-resistant joint 5 and the filler 6.

  FIG. 3 shows the seismic structure disclosed in Patent Document 2, and after the construction of the invert 9 is performed, the tubular portion 10, the flange portion 11, and the inversion between the tubular portion 10 and the flange portion 11 are shown. A rubber or resin seismic joint 13 made of a V-shaped displacement absorbing portion 12 is used, and the tubular portion 10 is attached to the end portion of the rehabilitating tube 16 protruding into the manhole from the existing tube 15 connected to the manhole side wall 14. After the outer fitting, the band 17 is fastened, and the flange portion 11 is fastened with an anchor bolt 18 fixed to the side wall of the manhole, and then a stepped semicircular cushion material composed of a large diameter portion and a small diameter portion. 19 is applied from the lower side to the lower half of the rehabilitation pipe 16 from the concave chipped portion where the invert 9 is cut, and then the concave chipped portion of the invert 9 is backfilled with mortar. The backfilled mortar has an arc-shaped channel (not shown) that reaches the rehabilitation pipe 16 on its surface. FIG. 3 shows a cross section of the seismic structure after construction.

  When relative movement occurs between the rehabilitation pipe 16 and the manhole 14 due to the crustal movement of the earthquake, and the welfare pipe 16 protrudes into the manhole as shown in FIG. 4, the displacement absorbing portion 12 follows the protrusion. However, the cushion material 19 is pushed in and extended to absorb the movement.

  The above shows the construction method for making the connection portion between the existing pipe and the manhole side wall seismic resistant and the seismic structure obtained by the construction method. However, the seismic structure in which the connection portion between the manhole side wall and the new construction pipe is made earthquake resistant is also known.

  FIG. 5 shows an example disclosed in Patent Documents 3 and 4, and the construction thereof is an earthquake-resistant joint including a small diameter portion 21a, a large diameter portion 21b, and an inclined portion 21c between these large and small diameter portions. 21, the small-diameter portion 21 a on the distal end side of the joint 21 is inserted into the hole 23 formed through the manhole side wall 22 from the outside of the manhole, and then inside the large-diameter portion 21 b located in the hole 23. The mounted overhang metal fitting 24 is expanded in diameter using an expansion jig (not shown), and is crimped to the inner surface of the hole 23 and fixed. Next, the new pipe 25 is inserted into the joint from the outside of the manhole, and the joint small-diameter portion 21a is tightened from the outer peripheral side by the fastening band 26 with the pipe end protruding into the manhole protruding from the small-diameter portion of the joint 21. After fitting and fixing, the tube 25 is pulled out of the manhole, and the tube end is flush with the inner surface of the manhole side wall 22. As the tube 25 is pulled out, the inclined portion 21c of the joint 21 is folded back toward the outside of the manhole from the large diameter portion 21b, and the small diameter portion 21a is drawn out of the manhole. Thereafter, a filler 27 made of rubber or resin sponge is pushed into the tapered annular gap between the pipe 25 and the inclined portion 21c of the joint 21 from inside the manhole, and then the gap around the pipe 25 from inside the manhole. The mortar 28 is coated over the joint 21 and the filler 27 so as to be flush with the inner surface of the manhole. Thereafter, mortar is placed at the bottom of the manhole, and an invert 29 having a groove-like flow path (not shown) to the tube 25 is formed on the surface thereof. The figure shows the cross section of the seismic structure after construction.

  The joint 21 is attached from the outside of the manhole, but a type that is attached from the inside of the manhole is also known. FIG. 6 shows an example, and the construction is performed by using an earthquake-resistant joint 31 having a small diameter portion 31a, a large diameter portion 31b, and an inclined portion 31c between these large and small diameter portions, similar to the joint 21. An overhang fitting mounted on the inside of the joint large-diameter portion 31b with the small-diameter portion 31a on the distal end side of the joint 31 inserted into the hole 23 formed in the manhole side wall 22 from the inside of the manhole and the joint tip protruding outside the manhole. 32 is expanded in the same manner as described above, and the joint large-diameter portion 31b is crimped to the inner surface of the hole 23 and fixed. Thereafter, the tube 33 is inserted from the outside of the manhole into the joint from the small diameter side of the joint tip so that the pipe end is flush with the inner surface of the manhole side wall 22, and the small diameter portion 31 a is fastened and fixed by the fastening band 26. . Next, after filling the filler 33 into the annular gap on the outer periphery of the tube 25 from the inside of the manhole, the mortar finish is performed in the same manner as described above. FIG. 6 shows a cross section of the seismic joint after construction.

Patent No. 4628409 Patent No. 5199164 JP 2004-100144 A JP 2004-316302 A

  In the seismic structure shown in FIG. 1, the horizontal displacement and inclination of the existing pipe 2 when an earthquake occurs can be absorbed by the seismic joint 5 and the filler 6, but contact with sewage such as the seismic joint 5 and the filler 6. If the swirling sewage that flows into the manhole on the surface collides with it or hits with pebbles or metal pieces flowing in with the sewage, it will wear out for a long time, and if the amount of wear increases, the water-stopping performance of the seismic joint 5 will be impaired. There is a risk of becoming.

  In the seismic structure shown in FIG. 3, although the cushion material 19 covered with the invert 9 is not worn, the exposed portion of the seismic joint 13 that is not covered with the invert 9 is in direct contact with sewage and absorbs the displacement. The dust is likely to adhere to the displacement absorbing portion 12, and the metal band 17 and the anchor bolt 18 are corroded, and the fixing of the joint 13 is likely to be impaired. Further, the cushion material 19 and the joint 13 covered with the invert 9 are hindered by the invert 9 having a strong displacement and inclination at the time of an earthquake, so that a problem such that the cushion material 19 and the displacement absorbing portion 12 of the joint 13 do not function is expected. .

  5 and 6, the joints 21 and 31 and the fillers 27 and 33 are covered with the mortars 28 and 34, so that they are not worn out by sewage and trash in the sewage is not attached. With respect to the relative displacement and inclination of the pipe 25 and the manhole side wall 22 during an earthquake outside the manhole, the inclined portions 21c and 31c of the joints 21 and 31 are bent and stretched, and the fillers 27 and 33 are elastically deformed. Thus, the relative displacement and inclination of the tube 25 and the manhole side wall 22 are absorbed. However, when the tube 25 is displaced toward the manhole, the portion where the invert 29 is formed is The relative displacement and inclination of the tube 25 and the manhole side wall 22 are hindered, and the functions of the joints 21 and 31 and the fillers 27 and 33 are not exhibited.

  The present invention solves the above-mentioned problem, covers the seismic joint with mortar so as not to be exposed, and does not hinder the displacement or inclination of the pipe connected to the manhole side wall toward the manhole during an earthquake. The purpose is to provide an earthquake resistant structure.

  The invention according to claim 1 is an earthquake-resistant joint capable of absorbing the relative displacement and / or inclination of the pipe and the manhole side wall that are mounted around the pipe connected to the side wall of the manhole, and an absorbent material rich in elasticity, and It consists of a thin, easily breakable mortar covering the seismic joint and absorber so that the seismic joint and absorber are not exposed in the manhole, and an invert formed by placing the mortar on the bottom of the manhole. Is an earthquake-resistant structure in the connection portion between the side wall of the manhole and the pipe, in which an arc-shaped groove-like flow path is formed which reaches the pipe and is connected to the inner peripheral surface of the pipe without a step. The invert is bonded to the mortar. And at least the upper surface is an arcuate surface provided at a position not interfering with the extended portion when the tube is extended into the manhole, and Only is characterized in that the arc-shaped invert the surface layer portion is larger than the wall thickness of the tube, edge cutting member to perform edge cutting of the lower side of the inverter from which it is embedded.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, the arcuate surface of the edge-cutting material is located between the inner diameter and the outer diameter of the mortar thin portion that is easy to break,
The invention according to claim 3 is the invention according to claim 1 or 2, wherein the pipe connected to the side wall of the manhole is inserted into the pipe after being inverted around the pipe, and is lined. A rehabilitation pipe is attached in a state where a part protrudes from the pipe, and the seismic joint is a tubular part that is externally fitted and fixed to a pipe end part of the rehabilitation pipe that projects into a manhole. A flange portion that is fixed to an outer side surface or an inner side surface and a displacement absorbing portion that is formed between the tubular portion and the flange portion, and the absorbent material is mounted adjacent to the displacement absorbing portion of the joint. It is characterized by that.

  The invention according to claim 4 is the invention according to claim 1 or 2, wherein the seismic joint is a tube portion that is externally fitted and fastened to the tube outside the manhole or the tube end portion of the tube protruding into the manhole. And a flange portion that is applied to the outer side surface or the inner side surface of the side wall of the manhole, and a displacement absorbing portion that is formed between the tubular portion and the flange portion.

  The invention according to claim 5 is characterized in that the edge cutting material according to any one of claims 1 to 4 is a sheet made of an elastic body made of rubber or resin.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the edge cutting member has an arc-shaped rib projecting toward an extended portion of the rehabilitation pipe at one end on the side farther from the rehabilitation pipe end. Is formed to protrude.

  According to the earthquake-resistant structure of the invention according to claim 1, due to the displacement that leads to the destruction of the mortar thin portion covering the earthquake resistant joint and the absorbent due to the relative displacement and inclination of the pipe and the manhole side wall at the time of the earthquake, The invert surface layer on the border cutting material is pushed out and easily peeled off and removed at the interface with the edge cutting material. This also covers the portion of the mortar thin part that touches the invert surface layer that is covered with invert. As in the case of the non-existing portion, the operation is performed without any trouble, and the relative displacement and inclination of the joint and the manhole side wall during the earthquake due to the joint's displacement absorbing portion and the absorbent material are absorbed.

  As described above, the inverted surface layer portion on the arcuate surface of the edge cut material is pushed out by the displacement of the mortar thin portion covering the seismic joint and the absorber, and peels off from the arcuate surface. If the arc-shaped surface is arranged in a range smaller than the inner diameter of the mortar thin portion and the arc-shaped surface interferes with the tube when the tube protrudes, even if the mortar thin portion is about to be displaced, a strong invert on its side If the mortar thin portion is not destroyed, the functions of the earthquake-resistant joint and the absorbent material cannot be exhibited. That is, it becomes impossible to absorb the relative displacement and inclination of the pipe and the side wall of the manhole at the time of the earthquake. Conversely, if the arc-shaped surface of the edge cut material is arranged at a deep position in the invert, even if the invert surface layer or the edge cut material having a large thickness is pushed in, the movement is blocked by the strong invert on the side, and the invert surface layer portion. It becomes difficult to remove and remove. If the arcuate surface of the edge cutting material is positioned between the inner diameter and the outer diameter of the mortar thin portion as in the invention according to claim 2, the invert surface layer portion can be reliably peeled and removed.

According to the earthquake-resistant structure of the invention according to claim 3, the connection portion between the existing pipe and the manhole side wall can be made into an earthquake-resistant structure, and the absorbent material is disposed adjacent to the absorbing portion of the joint, thereby providing a backup material. Even if the displacement is such that the mortar thin portion on the side surface is not destroyed, the absorber can absorb the displacement of the tube while accompanying the displacement of the displacement absorbing portion.
According to the seismic structure of the invention which concerns on Claim 4, it can apply to the structure of the connection part which connects a new installation pipe to a manhole side wall.

  According to the earthquake resistant structure of the invention according to claim 5, since the edge cutting material is a sheet even if it is an elastic material, and the amount of elastic deformation in the thickness direction is small, the invert is applied even if an external pressure due to sewage is applied to invert except during an earthquake. The surface layer is difficult to break, and the mortar thin wall is easily destroyed by the relative displacement and inclination of the manhole side wall and pipe during an earthquake, so even if the back-up material or seismic joint hits the edge cutting material, they are damaged. It is hard to produce. In addition, the sheet has a simple structure, and a commercially available sheet can be used as it is, thereby reducing the cost.

  According to the seismic structure of the invention of claim 6, since the back-filled portion of the surface layer portion on the rib is thin and weak due to the rib, the back-back portion of the surface layer portion is further easily peeled and easily removed.

Sectional drawing which shows the prior art example of an earthquake-resistant structure. Sectional drawing at the time of construction of the earthquake-resistant structure shown in FIG. Sectional drawing which shows another example of the prior art example of an earthquake-resistant structure. Sectional drawing of the earthquake-resistant structure shown in FIG. 3 in which the welfare pipe protruded during the earthquake. Sectional drawing which shows another example of the prior art example of an earthquake-resistant structure. Sectional drawing which shows the other example of the prior art example of an earthquake-resistant structure. Sectional drawing of the earthquake-resistant structure which concerns on this invention. Sectional drawing in the AA of FIG. Sectional drawing of the earthquake-resistant structure shown in FIG. 7 in which the welfare pipe protruded during the earthquake. Sectional drawing of another example of the earthquake-resistant structure which concerns on this invention. Sectional drawing in the BB line of FIG. Sectional drawing of another example of the earthquake-resistant structure which concerns on this invention. Sectional drawing of another example of the earthquake-resistant structure which concerns on this invention. Sectional drawing of the other example of the earthquake-resistant structure which concerns on this invention.

  FIG. 7 shows the seismic structure according to this embodiment, that is, the seismic structure at the connecting portion of the existing pipe 41 and the manhole side wall 43 inserted into the pipe by inserting the rehabilitated pipe 42 and the manhole side wall 43. The seismic joint 44 attached to the end portion of the rehabilitated pipe projecting inward is a tubular part 45 and a displacement absorbing part that absorbs relative displacement and inclination between the pipe 41 and the manhole side wall 43 in the tubular part 45. It consists of a flange portion 47 connected via an expansion / contraction portion 46, and the tubular portion 45 is externally fitted to the end portion of the rehabilitating pipe and is fastened by a fastening means, for example, the end of the rehabilitating pipe with an adhesive or double-sided tape. They are either bonded or fastened by a fastening band stretched from the outside, and FIG.

  In the illustrated example, the expansion / contraction portion 46 has an inverted U shape that faces the tube axis direction, but may have a V shape or a wavy shape as shown in FIG. It may be provided at a plurality of locations at regular intervals in the radial direction. 5 and 6 may also be bendable / extendable inclined portions 21c and 31c formed between the large-diameter portions 21b and 31b and the small-diameter portions 21a and 31a of the earthquake-resistant joints 21 and 31, respectively. In short, the expansion / contraction part 46 may have any structure as long as it can absorb displacement and inclination due to shaking during an earthquake, and is not limited to a specific structure.

  The flange portion 47 is applied to the inner wall surface of the manhole side wall 43, and is fixed to the manhole side wall 43 by an adhesive or a double-sided tape 49. The flange 47 may be fixed using an anchor bolt 18 as shown in FIG.

  The tubular portion 45 of the earthquake-resistant joint 44 that is externally fitted to the end portion of the rehabilitated tube and is fastened by a double-sided tape 48 is used as a ring-shaped absorbent material rich in stretch made of rubber or resin sponge on its outer peripheral surface. The backup material 51 is mounted in a close fitting state. The backup material 51 is provided so that the expansion / contraction of the expansion / contraction part 46 can be ensured even if the earthquake-resistant joint 44 is covered with mortar described later. The outer diameter of the elastic member 46 is approximately the same as the outer diameter of the elastic member 46. When the elastic member 46 is attached to the tubular part 45 by being applied to the elastic part 46 from the side surface, the elastic part 46 is covered with the side part. The back-up material 51 may have an outer diameter equal to or larger than the outer diameter of the stretchable portion 46, and may protrude in the radial direction from the stretchable portion 46. As long as it is within the secured range, it may be smaller than the outer diameter of the stretchable portion 46 and may be retracted in the radial direction from the stretchable portion 46.

  The welfare pipe 42 that protrudes into the manhole from the existing pipe 41 is cut at a position protruding a set length from the mounting position of the backup material 51 to cover the above-mentioned seismic joint 44 and the backup material 51. The mortar can be applied up to the mortar coating allowance. The mortar on the side of the backup material is thin, and is easily broken by the relative displacement and / or inclination of the rehabilitating pipe 42 in the event of an earthquake, so that the expansion / contraction part 46 can sufficiently expand and contract. The mortar 53 covering the flange portion 47 is thick and strong, and will not be broken even if the existing pipe 41 and the rehabilitated pipe 42 are displaced relative to the manhole side wall 43 at the time of an earthquake. The state of being firmly fixed to the manhole side wall 43 is maintained.

  The construction until the seismic joint 44 and the backup material 51 described above are covered with mortar is performed as follows.

  First, a required amount of the invert 54 adjacent to the pipe end of the existing pipe 41 in the manhole is removed using a tool such as an air hammer. In FIG. 7, a substantially inclined line in the invert indicates the bottom surface of the chipped portion where the existing invert 54 is shaved in a concave shape. Next, a thermoplastic tube such as vinyl chloride is constricted from the end of the existing tube 41 connected to the manhole side wall 43 from the manhole, inserted in a curved cross section, and then heated through high-temperature air or steam. Then, it is inflated into a circular cross section and brought into close contact with the inner peripheral surface of the existing pipe, and is lining to form a rehabilitated pipe. The rehabilitated pipe 42 is projected into a manhole by an appropriate amount, the above-mentioned seismic joint 44 is attached to the projecting pipe end, and the flange part 47 is attached to the inner surface of the manhole side wall so that the rehabilitated pipe 42 and the manhole side wall 43 are interposed. Stop water. Next, a ring-shaped backup material 51 is attached to the tubular portion 45 of the earthquake-resistant joint 44 from the outer peripheral side, and then the mortar 53 is applied to cover the earthquake-resistant joint 44 and the backup material 51. The backup material 51 is a ring-shaped material, but is wound around the outer periphery of the tubular portion 45 using a tape-shaped material, cut once and cut, and both ends are butted together or connected endlessly using a connector. You may make it do.

  In the earthquake-resistant structure described above, in the embodiment according to the present invention, the mortar is back-filled in the chipped portion of the invert 54 after the mortar coating is applied to the earthquake-resistant joint 44 and the backup material 51. An arcuate surface located between the inner and outer diameters of the backup material 51, preferably concentric with the extension of the backup material 51 into the manhole and having a radius of curvature between the inner diameter and the outer diameter of the backup material 51 After the mortar is formed, an edge cutting material attaching operation described later is performed. The edge-cutting material shown in FIG. 8 is composed of a sheet 57 having ribs 56 of a fixed height projecting perpendicularly at one side end, and is attached to the side without the ribs 56 near the end of the rehabilitation pipe, preferably mortar. The sheet 57 is placed in contact with the thin wall portion 53a so that the side with the rib 56 is away from the end of the rehabilitation pipe and to the depth that interferes with the backup material 51 when the rehabilitation pipe 42 protrudes into the manhole. This is done by mounting in an arc along the arcuate surface.

  When the sheet 57 is arranged in a range (shallow position) smaller than the inner diameter of the mortar thin portion 53a and interferes with the welfare tube 42 when the welfare tube 42 protrudes on the extension of the welfare tube 42, Even if the mortar thin portion 53a is about to be displaced, there is a strong invert on the side surface of the mortar thin portion 53a. Therefore, the mortar thin portion 53a is not destroyed by this, and the mortar thin portion is not destroyed. The function of the material cannot be exhibited, and the relative displacement and inclination between the pipes 41 and 42 and the manhole side wall 43 during the earthquake cannot be absorbed. On the contrary, when the sheet 57 is disposed at a position deeper than the outer diameter of the backup material 51, even if the invert surface layer 58 having a large thickness is pushed in, the movement is blocked by the strong invert on the side, and the invert surface layer It becomes difficult to remove and remove the portion 58. When the sheet 57 is at least within the range of the mortar thin portion 53a and preferably positioned between the inner diameter and the outer diameter of the backup material 51, the invert surface layer portion can be reliably peeled and removed.

  After the sheet 57 is attached to the arc-shaped surface of the mortar, the mortar is placed on the sheet. And it connects with the flow path which remains in the invert 54 other than the place which was crushed on the surface, and restores and forms the flow path 59 which consists of an arc-shaped groove | channel which reaches the rehabilitation pipe pipe end (refer FIG. 8). The flow path 59 gradually becomes deeper toward the end of the rehabilitation pipe and is connected to the inner peripheral surface of the rehabilitation pipe without a step, thereby allowing sewage or the like to flow smoothly into the rehabilitation pipe.

  The mortar is placed on the sheet until both ends of the sheet 57 are covered as shown in FIG. 8 and until the ribs 56 are covered as shown in FIG. You may make it carry out to the grade which makes | forms and the level which makes | forms the rib 56 and level.

  The sheet 57 used is formed of a non-adhesive elastic material such as EPDM, NR, CR, a rubber material, a thermoplastic resin made of a rubber-like elastic material such as thermoplastic elastomer, vinyl chloride, and the like. Is integrally formed on one end side of the sheet 57, but may be attached separately from the sheet 57 and attached to the sheet 57.

  The invert surface layer portion 58 formed by placing mortar on the sheet 57 is in a state of being edge-cut by the sheet 57 from the invert under the sheet covered with the sheet 57. As shown in FIG. 7, the invert inside and outside the rib is continuous on the rib, and the invert inside and outside is continuous as shown in FIG. 8 at both ends of the curved sheet. Can be easily broken because it is thin and weak in strength.

  According to the earthquake-resistant structure of the present embodiment, when the welfare pipe 42 protrudes into the manhole from the existing pipe 41 as shown in FIG. 9 in the event of an earthquake, for example, the sheet is extruded to destroy the weak mortar on the ribs and on both ends of the sheet. The upper surface portion 58 is pushed in and peeled off at the interface between the mortar and the non-adhesive sheet 57 and easily removed. This promotes the destruction of the mortar thin portion 53a that covers the side of the backup material even at the place covered with invert, and the expansion / contraction portion 46 as the displacement absorbing portion of the earthquake-resistant joint 44 has its entire circumference regardless of whether or not there is invert. Can be easily expanded and contracted.

The sheet 57 may be formed of a rigid material such as a metal such as steel or aluminum or a hard resin such as polypropylene instead of the rubber or resin material described above. Although it may be a block with a large rigidity whose inner surface forms an arc shape, by making the elastic sheet 57,
(1) Easy to handle, can be cut and used according to the required size, and is easy to install along the arc surface of the mortar.
(2) When the rigidity of the edge-cutting material is large, when the mortar thin portion 53a covering the side surface of the backup material is destroyed in the event of an earthquake and the expansion / contraction part 46 of the earthquake-resistant joint 44 is extended, There is a possibility that the portion 46 is blocked by the edge cutting material and prevented from extending, or hits the edge cutting material and may be damaged. However, when the edge cutting material is the elastic sheet 57, such a problem does not occur.
(3) A commercially available sheet 57 can be used, and the cost can be reduced.
It has effects such as.

  The embodiment described above shows the earthquake resistant structure in the connection portion between the manhole side wall 43 and the existing pipe 41, but the same configuration can be made when a new pipe is connected to the manhole side wall.

  FIG. 10 shows the seismic structure at the connection portion between the manhole side wall 61 and the new pipe 62. The new pipe 62 with the seismic joint 64 attached is inserted into the perforation 63 formed in the manhole side wall 61. The position of the tube end surface is adjusted so as to be flush with the inner surface of the manhole side wall 61, or the tube end portion is cut. Next, a filler 65 made of rubber or resin sponge as an absorbent material is loaded into the perforations 63 around the pipe end. As with the backup material 51 described above, the filler 65 is ring-shaped or wound around the new pipe 62 and cut around once, and then the cut end face is abutted or connected using a connector. The loading into the perforations is performed while securing the mortar coating allowance from the inner surface of the manhole. After loading the filler, mortar is applied to the mortar allowance. Since the mortar coating allowance is small, the coated mortar also becomes a thin mortar thin portion 66, and is easily destroyed by the relative displacement and inclination between the new pipe 62 and the manhole side wall 61 during an earthquake. That is, the mortar thin portion 66 functions in the same manner as the mortar thin portion 53a provided in the earthquake resistant structure applied to the existing pipe 41 described above.

  The earthquake-resistant joint 64 has the same structure as that of the above-described earthquake-resistant joint 44 except that in the earthquake-resistant joint 44 described above, an insertion portion 68 is provided between the tubular portion 45 and the stretchable portion 46 so as to protrude in the opposite direction to the stretchable portion 46. The seismic joint 44 shown in FIG. 7 is attached to the inside of the manhole side wall 43 by inserting the tubular portion 45 into the new tube 62 from the tip side so that the insertion portion 68 faces the end of the new tube pipe when used. Is attached to the outside of the manhole side wall 43 in the reverse direction. Then, the position of the joint 64 attached to the new pipe 62 is shifted before and after the mortar application, and the flange portion 47 is applied to the outer surface of the manhole, and the insertion portion 68 is formed in the perforation 63 around the end of the new pipe. In a state where the insertion and the position of the filler 65 are regulated, the tubular portion 45 is fastened to the new tube 62 and the flange portion 47 is fastened to the outer surface of the manhole, as in the joint 44 described above.

  Thereafter, mortar is placed on the bottom of the manhole to form the invert 69. At the stage where most of the invert is formed, the mortar thin portion 66 is within the radial range, similar to the embodiment shown in FIG. The sheet 57 is disposed concentrically with the new pipe 62 within the range of the outer diameter of the new pipe 62 and the outer diameter of the perforations 63. Next, a mortar is placed on the sheet, and a substantially arc-shaped channel 70 reaching the new pipe 62 is formed on the surface of the invert surface layer 71 on the sheet (see FIG. 11). This flow path 70 is continuous with the inner peripheral surface of the new pipe 62 without any step so that sewage can smoothly flow into the new pipe 62.

  FIG. 12 shows another example of the seismic structure at the connection portion between the manhole side wall 61 and the new pipe 62. The new pipe 62 is inserted into the perforation 63 formed in the manhole side wall 61 and protrudes into the manhole. A seismic joint 73 having the same structure as that of the above-mentioned seismic joint 44 having the size matched to the outer diameter of the new pipe 62 is mounted on the outer periphery of the new pipe, and the pipe end and flange are mounted as in the embodiment shown in FIG. The parts are fixed to the end of the newly installed pipe and the side wall of the manhole. Next, as in the embodiment shown in FIG. 7, a backup material 51 is attached to the outer periphery of the tubular portion 45, the mortar 43 is applied to cover the joint 73 and the backup material 51, and the side surface of the backup material is a thin portion 43a. Thereafter, mortar is placed on the bottom of the manhole to form the invert 64. And in the process, like the seismic structure shown in FIG. 10, the above-mentioned sheet 57 is arranged between the inner and outer diameters of the mortar thin portion 43a, the mortar is placed thereon, and the surface is connected to the new pipe 62 on the surface. As shown in FIG. 11, an arc groove-shaped flow path 70 is formed.

  13, in the earthquake-resistant structure shown in FIG. 6, the sheet 57 is embedded in the invert 29 so as to be disposed between the outer diameter of the tube 25 and the outer diameter of the hole 23 as in the above-described embodiment. FIG. 14 shows an example, in which the sheet 57 is embedded in the invert 29 in the embodiment shown in FIG. Both forms consist of joints 21 and 31 and fillers 27 and 33 as in the forms shown in FIGS. 5 and 6, and these manholes are covered with mortar thin portions 28 and 34.

21, 31, 44, 64, 73 ... Earthquake-proof joints 29, 54, 69 ... Invert 41 ... Existing pipes 42 ... Welfare pipes 43, 61 ... Manhole side wall 45 ... Tubular part 46 ... Expandable part 47 ...・ Flange part 51 ・ ・ Back-up material 53 ・ ・ Mortar 56 ・ ・ Rib 57 ・ ・ Seat 58 and 71 ・ ・ Invert surface layer part 59 and 70 ・ ・ Flow path 62 ・ ・ New pipe 63 ・ ・ Perforated 65 ・ ・ Filler

Claims (6)

  Seismic joint that is mounted around the pipes 25, 41, 42, 62 connected to the manhole side walls 22, 43, 61 and can absorb the relative displacement and / or inclination between the pipe and the manhole side walls 22, 43, 61 21, 31, 44, 64, 73 and absorbent materials 51, 65 rich in stretchability, and the thin wall covering the seismic joint and absorber so that the seismic joint and absorber are not exposed in the manhole can be easily broken Mortars 28, 34, 43a, 53, 66 and inverts 29, 54, 64, 69 formed by placing mortar at the bottom of the manhole, and on the surface of the invert, the pipes 25, 41, 42, 62 In the seismic structure at the connecting portion between the side wall of the manhole and the pipe in which the arc-shaped channel 59, 70 connected to the inner peripheral surface of the pipe without any step is formed, 29, 54, 64, and 69 are made of a material that does not adhere to the mortars 28, 34, 43a, 53, and 66, and at least the upper surface of the tubes 25, 41, 42, and 62 is extended into the manhole. Arc-shaped invert surface portions 58 and 71 having an arc-shaped surface provided at a position not interfering with the extended portion of the tube and having a thickness larger than the thickness of the tubes 41, 42, and 62; An earthquake-resistant structure characterized in that an edge-cutting material 57 for cutting an edge is embedded.   An earthquake-resistant structure, wherein an upper surface of the edge cutting member is located between an inner diameter and an outer diameter of the mortar thin portion that is easily broken.   The pipes 41, 42, 62 connected to the manhole side walls 43, 61 are lined by inserting the inverts 29, 54, 69 around the pipes into the pipes, and a part thereof The rehabilitation pipe 42 is attached in a state of protruding from the pipe, and the seismic joints 21, 31, 44, 64, 73 are fitted onto the pipe end portion of the rehabilitation pipe 42 protruding into the manhole and fixed. A tubular portion 45, a flange portion 47 that is fixed to the outer surface or the inner surface of the manhole side walls 43, 61, and a displacement absorbing portion 46 that is formed between the tubular portion 45 and the flange portion 47, The earthquake-resistant structure according to claim 1 or 2, wherein the absorbent members 51 and 65 are mounted adjacent to the displacement absorbing portion 46 of the joint.   The seismic joint is attached to the tube outside the manhole or the tube end portion of the tube projecting into the manhole and fastened, and applied to the outer surface or inner surface of the side wall of the manhole. The seismic structure according to claim 1 or 2, further comprising a flange portion 47 and a displacement absorbing portion 46 formed between the tubular portion 45 and the flange portion 47.   The earthquake-resistant structure according to any one of claims 1 to 4, wherein the edge cutting material is a sheet 47 made of an elastic body made of rubber or resin.   6. An arc-shaped rib 46 projecting toward an extended portion of the rehabilitation pipe is formed on the edge cutting member 47 so as to protrude from one end on the side farther from the rehabilitation pipe end. The earthquake-resistant structure according to any claim.

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