JP6399904B2 - Seismic joint structure for manhole - Google Patents

Description

The present invention is intended for rehabilitating existing pipes such as aged sewer pipes, for manholes used for connecting portions of thermoplastic resin rehabilitation pipes that are inserted and lined into existing pipes, and manhole side walls. The present invention relates to an earthquake-resistant joint structure .

  Patent Documents 1 and 2 below disclose water-stopping structures that stop a connection portion between a pipe end portion of a rehabilitation pipe that is inserted into an existing pipe and lined with a manhole side wall. Among these, as shown in FIG. 1, the water stop structure exemplified in Patent Document 1 is provided with a seismic resistance between the pipe end portion protruding into the manhole of the rehabilitated pipe 2 inserted into the existing pipe 1 and the manhole side wall 3. The joint 4 has a structure connected by a joint 4, and the joint 4 is formed by externally fitting a tube portion 4 a provided at the center portion from the tube end portion of the rehabilitated tube 2 to the tube end portion and tightening the band 5 from above. The peripheral flange portion 4c via the expansion / contraction part 4b is fixed to the manhole side wall 3 by anchor bolts 6.

  As shown in FIG. 2, the water stop structure exemplified in Patent Document 2 has a structure in which a rehabilitation pipe 2 inserted into a pipe of an existing pipe 1 and a lining are connected to a manhole side wall 3 by an earthquake-resistant joint 8. The seismic joint 8 has a cylindrical portion 8a provided in the center portion inserted into the rehabilitated tube from the tube end of the rehabilitated tube 2 and fixed from the inside by the enlarged ring 9, and at the periphery of the periphery via the bellows-shaped expansion / contraction portion 8b. The flange portion 8 c is fixed to the manhole side wall 3 by the anchor bolt 11.

Patent No. 5,405,883 Patent No. 5036370

The water-stopping structures disclosed in Patent Documents 1 and 2 reduce work in a narrow manhole because there is no need to hail the manhole side wall to which the existing pipe is attached or the required portion of the existing pipe, but the seismic joint is exposed. Therefore, dust tends to accumulate in the expansion / contraction part that absorbs the displacement at the time of the earthquake, and the metal anchor bolt, the fastening band, and the expansion ring that fix the earthquake resistant joint are corroded, and the fixing of the joint is impaired. easy.

In order to solve this problem, the applicant of the present application previously described in Japanese Patent Application No. 2014-116473, as shown in FIG. Flexibility provided with a cylindrical part 15a fitted on the pipe end part of the rehabilitated pipe 2 that is inserted into the existing pipe 1 such as a sewer pipe, and an expansion / contraction part 15c between the flange part 15b and the cylindrical part. The cylindrical portion 15a of the joint 15 is externally fitted to the pipe end portion 2a protruding into the manhole of the rehabilitated pipe 2 lined in the existing pipe, and the flange portion 15b of the earthquake-resistant joint 15 is connected to the manhole side wall 3 In order to ensure expansion and contraction of the expansion / contraction part 15c of the joint 15 even if the earthquake-resistant joint 15 is covered with the mortar 16 after being bonded to the tube part, the tubular part externally fitted to the pipe end 2a of the rehabilitation pipe 2 15a The backup material 17 which is rich in elasticity is externally fitted on the tubular portion 15a in the circumferential proposed Seismic joint structure for manholes fitted by pressing on the elastic portion 15c.

In this joint structure , the seismic joint 15 and the backup material 17 are covered with the mortar 16 and the mortar surface can be finished smoothly to prevent adhesion of dust and the like, and the flange portion 15b is attached to the manhole side wall 3. Even if the metal anchors 6 and 12 as shown in FIGS. 1 and 2 are used, the corrosion of the anchors can be prevented by covering with the mortar 16. Further, when crustal deformation occurs during an earthquake, the thin portion 16a of the mortar 16 on the side of the backup material is broken, so that the expansion / contraction portion 15c of the earthquake-resistant joint 15 expands / contracts along with the expansion / contraction of the backup material 17 and the backup material 17 is provided. Even if the joint 15 is covered with the mortar 16, the expansion / contraction of the expansion / contraction part 15c can be ensured, and the expansion / contraction of the expansion / contraction part 15c is prevented from being hindered. There was room for improvement.

  The rehabilitation pipe is made of thermoplastic resin as described above, and the lining to the existing pipe is inserted into the existing pipe, and then the rehabilitation pipe is heated and expanded through hot air in the rehabilitation pipe, thereby closely contacting the existing pipe. Since the pipe end portion of the rehabilitation pipe protruding from the pipe expands without being constrained from the outside by the existing pipe, it often expands in a trumpet shape as shown in FIG. If it is expanded in a trumpet shape, when inserting the tube portion 15a of the joint, the tube portion 15a must be expanded and inserted, but it is difficult to expand even if the joint is stretchable. May not be possible or insertion may be difficult. The expansion of the tube end portion is not constant and varies, and the larger the expansion, the more difficult it is to insert the tube portion 15a. Therefore, if the joint 15 provided with the cylinder portion 15a having a larger size than the rehabilitated pipe 2 lined inside the existing pipe 1 is used in anticipation of the size of the pipe end portion expanding, the cylinder portion of the joint to the pipe end portion is used. Although insertion of 15a becomes easy, as shown in FIG. 4, the cylinder part 15a of the joint 15 inserted in the pipe end part 2a of the rehabilitation pipe 2 which expands in a trumpet shape hits the pipe end part end at the cylinder part end When tightening with the tightening band 5, the cylinder portion 15 a is not crimped on the flange side even if it is crimped on the tube end side, so that the tightening area to the tube end portion 2 a is insufficient and water tightness is ensured. There is a risk of being lost. Further, the size of the pipe end portion that expands is not as expected, and particularly when the size of the pipe end portion 2a is smaller than the cylindrical portion 15a of the joint 15 (for example, when the pipe end portion 2a hardly expands). In addition, tightening with the tightening band 5 does not reduce the entire circumference cleanly in a state where the tube portion 15a of the joint 15 is free of wrinkles, and wrinkles are generated in the tube portion 15a, so it is difficult to ensure water tightness. Therefore, in such a case, means for inserting a cushioning material such as a sponge between the tube end 2a and the cylindrical portion 15a is used. However, it is not preferable to perform such work on site because it is troublesome.

The present invention provides a tightening area to the tube end portion by the tubular portion of the joint regardless of whether or not the tube end portion of the rehabilitated tube expands in a trumpet shape, and even if the expansion angle of the trumpet shape varies. An object of the present invention is to provide a manhole seismic joint structure that can sufficiently remove water and thereby ensure water tightness.

The invention according to claim 1 is applied to the manhole side wall, which is fitted on the end of the pipe projecting into the manhole of the rehabilitating pipe inserted into the pipe of the existing pipe connected to the side wall of the manhole, and the manhole side wall. a flange portion, with the flange portion and the manhole seismic joint with a telescopic part between the cylindrical portion, and a fastening means for fastening wear the flange portion of the hand該継 the manhole sidewall, the tube end portion of the rehabilitating pipe mountain-shaped cylinder portion fitted around, a manhole seismic joint structure having a fastening means for fastening wear rehabilitating pipe tube end at its entire periphery, the tube portion, the outer peripheral side of the axially intermediate portion In the seismic joint structure for manholes , the protrusion is formed in a circumferential direction, and the protrusion is pressed by the fastening means when fastened by the fastening means. A recess that fits into the protrusion. A fitting portion having a concave portion having a circular cross section and having a flat outer peripheral surface without a step is fitted to the protruding portion so as to be swingable, or a contact surface to the protruding portion is flat on the protruding portion. and said fastening means engaging portion in a state of abutting on the protruding portion that is characterized by fastening to Rukoto the tube end the tube portion through the engaging portion.

The invention according to claim 2 is applied to the manhole side wall which is fitted on the end of the pipe projecting into the manhole of the rehabilitated pipe inserted into the pipe of the existing pipe connected to the side wall of the manhole, and the manhole side wall. A flange part, an earthquake-resistant joint for manholes having an expansion / contraction part between the flange part and the cylinder part, a fastening means for fastening the flange part of the joint to a manhole side wall, and a pipe end part of the rehabilitated pipe A seismic joint structure for manholes having fastening means for fastening an outer fitting tubular part to the rehabilitated pipe end part around the entire circumference, and the tubular part has a mountain shape on the outer peripheral side of the intermediate part in the axial direction. In the seismic joint structure for manholes, in which the projecting portion is formed in a circumferential direction, and the projecting portion is pressed by the fastening means when fastened by the fastening means. Instead of forming a concave arc And the fastening means is connected to the tube end portion via the fitting portion in a state in which a fitting portion having a convex arcuate cross section is slidably fitted in the concave portion. It is characterized by being fastened .
The invention according to claim 3 is the invention according to claim 1 or 2 , wherein the inner peripheral surface on the side of the insertion port that contacts the end of the tube end is tapered or curved when the tube is inserted into the end of the tube. It is characterized by that.

According to a fourth aspect of the present invention, in the first to third aspects of the invention, the cylindrical portion projects to the inner peripheral side at the end of the cylindrical portion and is locked to the end surface of the tube end portion of the rehabilitated pipe, thereby positioning the cylindrical portion. It has the protrusion for positioning to perform.
.

According to the first and second aspects of the present invention, the fastening means presses and fastens the protruding portion located at the axially intermediate portion of the cylindrical portion, and thereby the fastening force to the cylindrical portion is dispersed to the bottom of the protruding portion. Since the tightening force is applied over a wide range in the axial direction of the tube portion, the tube portion is rehabilitated regardless of whether or not the protruding portion of the rehabilitation tube expands in a trumpet shape and regardless of the expansion angle. As shown in FIG. 4, the tightening area of the tube portion to the tube end portion is increased, and sufficient watertightness can be secured. In addition, the pipe end of the rehabilitated pipe is expanded due to the fitting part that fits or contacts the protruding part of the cylindrical part or the fitting part that fits into the concave part of the cylindrical part swings relative to the protruding part or the concave part. Regardless of the expansion angle, the outer peripheral surface of the fitting portion can be parallel to the axial center of the cylindrical portion, and by making it parallel, the tube of the cylindrical portion by the fastening means via the fitting portion Fastening to the end portion is performed in a wide range in the tube axis direction, and the tube portion can be held at the tube end portion with a predetermined pressure.

According to the invention of claim 3 , when the cylindrical portion is inserted into the tube end portion, the inner peripheral surface on the side of the insertion port that contacts the end of the tube end portion is tapered or curved, thereby increasing the diameter of the tube end portion. When pushing, the cylindrical inner peripheral surface or the curved inner peripheral surface serves as a guide so that the cylindrical portion can be easily expanded and inserted.

According to the invention which concerns on Claim 4, when inserting a cylinder part from the pipe end part end of a rehabilitation pipe | tube and fitting externally to this pipe end part, it inserts until a protrusion latches to the pipe end part end surface of a rehabilitation pipe | tube. Thus, the tube portion can be easily mounted at a predetermined position of the rehabilitated tube end portion, and workability is improved. Also, when tightening with the tightening means, if the cylinder part is displaced in the axial direction, water tightness may be reduced and water leakage may occur. It is prevented that the position shifts. In addition, the protrusion can be locked to the end surface of the rehabilitating tube so as to close the space between the tube end of the rehabilitating tube and the tubular portion, so that the water tightness can be further improved. Become.

Sectional drawing which shows the prior art example of a water stop structure. Sectional drawing which shows another prior art example of a water stop structure. Sectional drawing of another example of a water stop structure. Sectional drawing which shows the deformation | transformation aspect of the water stop structure shown in FIG. The front view of the earthquake-proof joint which concerns on this invention. AA line sectional view of Drawing 5. Sectional drawing of the earthquake-resistant joint structure which expanded the a part of FIG. Sectional drawing which shows the state fastened to the renovated pipe pipe end part which expanded the cylinder part of the earthquake-resistant joint structure using the fastening belt. Sectional drawing of the water stop structure after construction. The schematic diagram in the case of performing using the fastening means of another aspect. Sectional drawing of the water stop structure in the example where a rehabilitation pipe pipe end does not expand. Sectional drawing in the location corresponding to the a part of FIG. 6 of another example of a seismic joint structure . Sectional drawing which shows the state fastened to the renovated pipe pipe end part which expanded the cylinder part of the earthquake-resistant joint structure using the fastening belt. Sectional drawing of the water stop structure constructed using the earthquake proof joint structure shown in FIG. Sectional drawing of the water stop structure in the example in which a rehabilitation pipe pipe end part does not expand using the earthquake proof joint structure shown in FIG. Sectional drawing in the location corresponding to the a part of FIG. 6 of another example of an earthquake-resistant joint structure . Sectional drawing which shows the state fastened to the renovated pipe end part which expanded the cylinder part of the earthquake-resistant joint structure using the fastening belt shown in FIG. Sectional drawing of the water stop structure constructed using the earthquake proof joint structure shown in FIG. Sectional drawing of the water stop structure in the example where a rehabilitation pipe pipe end does not expand. Sectional drawing in the location corresponding to the a part of FIG. 6 of another example of an earthquake-resistant joint structure . Sectional drawing of another example of an earthquake-resistant joint structure .

  Hereinafter, an earthquake-resistant joint according to an embodiment of the present invention will be described with reference to the drawings. In the figure, the same reference numerals are given to the same structural portions as those in FIGS.

  5 is a front view of the seismic joint 21 according to the present invention, FIG. 6 is a cross-sectional view taken along line AA of FIG. 5, FIG. 7 is a cross-sectional view enlarging a part of FIG. A stretchable rubber-like elastic body such as a thermoplastic elastomer or a resin, and a cylindrical portion 21a that is externally fitted to the end portion of the rehabilitated pipe, a peripheral flange portion 21b that is applied to the manhole side wall 3, and a cylindrical portion 21a And a flange portion 21b, and a telescopic portion 21c that can be expanded and contracted in the radial direction with a U-shaped cross section projecting sideways to form a donut shape in front view, and the cylindrical portion 21a is shown enlarged in FIG. As shown in the drawing, a projecting circular arc section is formed in the circumferential direction on the outer peripheral side, the projecting portion 22 is formed at the middle portion in the axial direction of the cylindrical portion 21a, and is projected in the radial direction. A protrusion that is locked to the side end surface of the attached band 23 to prevent displacement of the tightening band 23. 24, has a projection 25 for positioning is protruded inwardly in the inner periphery of the cylindrical portion end, and a water-swelling sponge 26 is bonded to the inner cylinder portion circumference.

The flange portion 21b has adhesive portions 27 made of butyl rubber mixed with an adhesive material, which are fastening means, attached to both left and right side surfaces.
Construction of a water stop structure using the seismic joint 21 at the connecting portion between the pipe end 2a of the rehabilitated pipe 2 inserted into the existing pipe 1 and the manhole side wall 3 is performed as follows.

  First, for the tube end portion 2a of the rehabilitated tube 2 that protrudes into the manhole and expands in a trumpet shape, a seismic joint 21 having a tube portion 21a that matches the expected expanded size is used. 21a is inserted from the end of the tube end and fitted. This external fitting is performed until the positioning projection 25 is locked to the end of the rehabilitating tube 16. At the beginning of the external fitting, the cylindrical portion 21a floats from the tube end portion 2a, and the cylindrical portion 21a on the positioning projection 25 side is in uneven contact with the end of the tube end portion 2a of the rehabilitated tube 2. It will be in a hit state. At the same time as or after the insertion of the tube portion 21a into the tube end portion, the flange portion 21b is attached to the manhole side wall 3 by being adhered by an adhesive portion 27 as a fastening means.

  Next, a known fastening band 23 constituting the fastening means is placed on the projecting portion 22 of the cylindrical portion 21a, and fastening with the fastening band 23 is performed. The projecting portion 22 has a convex arc cross section, and the tightening band 23 fastens the top of the projecting portion 22, whereby the tightening force is distributed to the hem of the projecting portion 22 located in the middle portion of the tube portion. As the tube portion 21a expands, the tube portion 21a is inclined so as to extend along the tube end portion 2a, and is eventually crimped to the tube end portion 2a via the water expansion sponge 26 over a wide range in the axial direction.

  At the time of tightening, the positioning projection 25 is locked to the end of the regenerated tube 2 and restrains the movement of the tube portion 21a, so that it is displaced to the base side of the tube end 2a. There is no. Further, as the tube portion 21a is tilted, the side end of the tightening band 23 is disengaged from the convex portion 24. However, even if it is disengaged, the tightening band 23 is displaced by the frictional force caused by the tightening of the tightening band 23 and is disengaged from the protruding portion 22. There is nothing.

FIG. 8 shows a state in which the tightening band 23 is used to fasten the tube end 2a that expands the tubular portion 21a.
After tightening with the tightening band, a ring-shaped backup material 17 made of rubber or resin sponge and having high stretchability is put on the tightening band 23 (see FIG. 9).

  The ring-shaped backup material 17 is provided so as to ensure expansion and contraction of the expansion / contraction part 21 of the earthquake-resistant joint 21. When the back-up material 17 is attached to the expansion / contraction part 21c by being pushed in from the side surface, the side surface of the expansion / contraction part 21c is provided. To cover. The outer diameter of the backup material 17 is larger than the outer diameter of the expansion / contraction part 21c, or the same diameter as shown in the figure, and within the range in which expansion / contraction of the expansion / contraction part 21c is ensured, the outer diameter of the expansion / contraction part 21c is smaller. You may withdraw in the radial direction from the expansion-contraction part 21c.

  The backup material 17 is also a ring-shaped material in the above-described example. However, the tape-shaped material is wound around the outer periphery of the cylindrical portion 21a, cut once and cut, and both ends are butted and bonded or connected. You may make it connect endlessly using a tool.

  After the back-up material 17 is left with the mortar coating allowance and retracted from the tube end, the mortar 16 is driven so as to cover the entire earthquake-resistant joint 21 and the back-up material 17 around the pipe end 2a of the rehabilitated pipe 2. Install and smooth the surface. The mortar 16 is applied to the extent that it is flush with the cylindrical portion 21a on the side of the backup material, and the mortar on the side of the backup material becomes a thin portion 32a that is the thickness of the coating. The thin portion 32a is easily damaged by shaking during an earthquake so that the expansion and contraction of the expansion / contraction portion 21c is not hindered. FIG. 9 shows the water stop structure after finishing.

  In the above embodiment, the known fastening band 23 is used as the fastening means, and the cylindrical portion 21a is fastened. Any fastening means can be used as long as the cylindrical portion 21a can be fastened to the pipe end 2a. Such a thing may be sufficient and it does not restrict to the fastening band 23 as shown to the said embodiment. FIG. 10 shows another example of the fastening means. The fastening bracket 34 has an annular shape, the inner diameter gradually increases from one side to the other side, the thickness decreases, and the cross section forms a wedge shape. At the time of use, the fastening bracket 34 is inserted into the pipe end 2a from the large-diameter portion side, pushed in until the inner peripheral surface hits the protruding portion 22, and then one side surface of the fastening bracket 34 is used with a tool. Push or hit in the direction of the arrow in the figure. As a result, the projecting portion 22 is gradually pushed down to the axial center side as indicated by a one-dot chain line in the figure, and the cylindrical portion 21a is pressure-bonded to the tube end portion 2a via the water-swelling sponge 26 as described above.

  The construction of the water stop structure is performed as described above. Before and after this construction, the required portion of the manhole invert 14 shown in FIG. 3 is suspended and backfilled by placing mortar on the suspended portion.

  The construction using the earthquake-resistant joint 21 provided with the cylindrical portion 21a that matches the size of the rehabilitated pipe 2 protruding into the manhole is as described above, but the size of the rehabilitated pipe 2 that expands in a trumpet shape is as described above. For example, as shown in FIG. 11, the tube end 2a of the rehabilitated tube 2 does not expand, and the tube end 2a has a substantially uniform outer diameter with the rehabilitated tube 2 lined inside the existing tube 1. In this case, the size of the inner diameter of the cylindrical portion 21a is slightly larger or the same as the outer diameter of the rehabilitated pipe 2 lined inside the existing pipe 1 (or the inner diameter of the existing pipe 1), preferably Are joints of the same diameter or smaller.

  In this way, with respect to the pipe end 2a having a substantially uniform outer diameter with the rehabilitated pipe 2, the inner diameter of the tubular part 21a is the outer diameter of the rehabilitated pipe 2 lined inside the existing pipe 1 (or the inner diameter of the existing pipe 1). ), The tube portion 21a is in close contact with the tube end portion 2a only by inserting the tube portion 21a of the earthquake-resistant joint 21 into the tube end portion 2a of the rehabilitated pipe 2, but expands. For the tube end 2a, the cylindrical portion 21a is expanded and inserted. The cylindrical portion 21a expanded with insertion is reduced in diameter to be restored on the flange side (root side) of the tube end portion 2a, and is restored while maintaining the expanded state at the end of the tube end. The cylinder portion 21a is brought into close contact with the contracting force. In this state, the tightening band 23 is placed on the protruding portion 22 of the cylindrical portion 21a, and the tightening band 23 is tightened. Since the projecting portion 22 has a convex arc cross section, the tightening band 23 fastens the top of the projecting portion 22 to disperse the applied pressure to the bottom of the projecting portion 22, thereby the cylindrical portion 21 a It is fastened to the pipe end 2a over a wide range in the axial direction up to the flange side portion. After fixing by fastening, the backup material 17 is attached and the mortar 16 is driven in the same manner as described above. Even if the flange-side portion of the cylindrical portion 21a is reduced in diameter when tightened, and the wrinkles come to approach at this time, the water-expandable sponge material 26 is interposed between the tube end portion 2a and the water-tightness. Sex is secured. The tightening of the tube portion 21a to the tube end portion 2a is similarly performed in the embodiment shown in FIG. However, in the embodiment shown in FIG. 10, the size of the pipe end portion 2 a to be expanded is predicted, and the diameter of the regenerated pipe 2 is increased by using the joint 21 of the cylinder portion 21 a that matches the size. The state just inserted into the tube end 2a is shown by a solid line, and after the insertion, the fastening bracket 34 is pushed in so that the tube portion 21a is brought into close contact with the tube end portion 2a as shown by a one-dot chain line. When the size of the inner diameter is matched with the outer diameter of the rehabilitated pipe 2 lined inside the existing pipe 1 (or the inner diameter of the existing pipe 1), the pipe end as shown by the one-dot chain line just by inserting the cylindrical portion 21a It will be in the contact state to 2a. Thereafter, the cylindrical portion 21a is fastened to the pipe end portion 2a using the fastening fitting 34.

  FIG. 12 shows a cross-sectional structure of a seismic joint 41 according to another embodiment at a location corresponding to part a in FIG. 6. The difference from the seismic joint 21 according to the embodiment shown in FIG. A fitting portion 42 having a concave arcuate cross section that fits into the projecting portion 22 having a cross section is provided, and is fitted to the projecting portion 22 so as to be swingable, and a flat surface on the outer periphery of the fitting portion 42 Is tightened using the tightening band 23, and at the time of tightening, the applied pressure is distributed over a wide range including the top of the protruding portion 22 via the fitting portion 42, and the cylindrical portion 22 is located on the flange side. It will be more reliably crimped to the root of the. The fitting portion 42 of the present embodiment is the same material or different material from the fastening band 23, and both 23 and 42 are formed separately and attached individually. It may be integrally formed with such a cross-sectional shape, or may be formed separately and integrated by adhesion. In addition, the surface which contacts the protrusion part 22 of the said fitting part 42 may be a flat surface.

  FIG. 13 shows a state in which the cylindrical portion 21a of the joint 41 is attached to the pipe end portion 2a in the same manner as in FIG. 9, and is then fastened using the fastening band 23 via the fitting portion 42. FIG. After mounting, the mortar finish is shown. Further, FIG. 15 uses a joint having a cylindrical portion 21a having an inner diameter substantially the same as the outer diameter of the lined rehabilitation pipe 2, as in FIG. 11, and the pipe end 2a does not expand and the rehabilitation pipe 2 is not expanded. The water stop structure at the time of attaching the cylinder part 21a to the pipe end part 2a of the rehabilitation pipe 2 extended straightly on extension is shown.

  FIG. 16 shows a cross-sectional structure of a seismic joint 51 according to another embodiment at a location corresponding to part a of FIG. 6. The difference from the seismic joint 41 of the embodiment shown in FIG. Instead of forming the projecting portion 22 having a convex arc cross section, a concave portion 52 having a concave arc cross section is formed, and the fitting portion 53 having a convex arc cross section is fitted to the recess 52 so as to be swingable. Thus, tightening by the tightening band 23 is performed on the flat surface on the outer periphery of the fitting portion 53.

  Also in the present embodiment, the fitting portion 53 is the same material or different material from the fastening band 23 as in the fitting portion 42, and both the 23 and 53 are formed separately and attached individually. However, both 23 and 53 may be integrally formed with a cross-sectional shape as illustrated, or may be formed separately and integrated by bonding. The material of the fitting portion 42 shown in FIG. 12 and the fitting portion 53 shown in FIG. 16 is preferably a rubber-like elastic body made of rubber or thermoplastic elastomer, but may be made of metal or resin. it can.

  FIG. 17 shows a state in which the fastening band 23 is used for tightening, and FIG. 18 shows a state in which the back-up material 17 is mounted and then mortar finished. Moreover, FIG. 19 shows the water stop structure when the pipe end part 2a of the rehabilitation pipe 2 extends straight on the extension of the rehabilitation pipe 2 that is lined without expanding, as in FIGS. 11 and 15.

In each of embodiments, the tube end 2a of the rehabilitating pipe 2 has spread, rehabilitating pipe in the embodiment to deal with the cylindrical portion 21a is a problem that it becomes difficult to insert supporting seismic joint hands 21, 41, 51 Although the embodiment in which the inner diameter of the tube portion 21a is increased in anticipation of the extent (size) of the tube end portion 2a is shown, it may be difficult to predict the expansion of the tube end portion 2a. Moreover, although the earthquake-resistant joint of the size suitable for the size of the cylinder part 21a should just be used, there may be no earthquake-resistant joint of the size suitable for the pipe diameter of the expanded pipe end part 2a. Furthermore, as described above, there is also an aspect in which the inner diameter of the cylindrical portion 21a is matched to the outer diameter of the rehabilitated pipe 2 lined inside the existing pipe 1 (or the inner diameter of the existing pipe 1). Although it is necessary to push the tube portion 21a into the tube end portion and insert it, the insertion may be difficult or may not be possible. The seismic joints 56 and 57 shown in FIGS. 20 and 21 can cope with this problem.

  A seismic joint 56 shown in FIG. 20 is formed by tapering the connecting portion 58 of the cylindrical portion 21a and the expansion / contraction portion 21c, which serves as an insertion port to the pipe end portion 2a. The seismic joint 57 shown in FIG. A connecting portion 59 between the tube portion 21a and the expansion / contraction portion 21c is formed in a curved surface shape (R shape). In any of the earthquake-resistant joints 56 and 57 of any of the embodiments, the insertion port expands toward the tube end 2a, and the diameter of the expanded tube end is the diameter of the opening end of the insertion port formed by the connection portions 58 and 59. If the tube end portion that is smaller and expands fits in the insertion port, the insertion port is pushed and expanded by pushing the cylindrical portion 21a, and the insertion port serves as a guide without expanding the insertion port by any means. Can be inserted easily.

  In the embodiment shown in FIGS. 20 and 21, the cylindrical portion 21a connected to the connecting portions 58 and 59 is uniform in the axial direction as shown in FIGS. 3 and 4 unlike the cylindrical portion 21a of the above-described embodiment. Although it is thick, it is needless to say that it can be similarly applied to the joints 21, 41, 51 provided with the cylindrical portion 21 a of each of the embodiments.

1. ・ Existing pipe 2 ・ ・ Rehabilitation pipe 2a ・ ・ Pipe end 3 ・ ・ Manhole side wall 16 ・ ・ Mortar 17 ・ ・ Back-up materials 21, 41, 51, 56, 57 ・ ・ Seismic joint 21a ・ ・ Cylinder 21b ・・ Flange part 21c ・ Expandable part 22 ・ Protrusion part 23 ・ Clamping band 25 ・ Protrusion 27 for positioning ・ Adhesive part 34 ・ Clamping fittings 42 and 53 , 59 .. Connection part

Claims (4)

A tubular portion 21a that is externally fitted to a tube end 2a that protrudes into a manhole of a rehabilitated tube 2 that is inserted into a tube of an existing tube 1 connected to the manhole side wall 3 and a flange portion that is applied to the manhole side wall 3 and 21b, and a manhole seismic joint having a stretchable portion 21c between the tubular portion 21a and the flange portion 21b, and a fastening means for fastening wear the flange portion 21b of the hand該継 the manhole sidewall 3, the rehabilitating pipe 2 the tube end 2a to the outer fitting to the cylindrical portion 21a, a manhole seismic joint structure having a fastening means for fastening wear rehabilitating pipe tube end at its entire periphery, the cylindrical portion 21a, the axial In the seismic joint structure for manholes, a projecting portion 22 projecting in a mountain shape on the outer peripheral side of the intermediate portion is formed in the circumferential direction, and the projecting portion 22 is pressed by the fastening means when fastened by the fastening means . , The projecting portion 22 has a convex arc cross section, has a concave portion having a concave arc cross section that fits into the projecting portion 22, and has a fitting portion 42 whose outer peripheral surface is flat without a step. The fastening means is fitted in a state in which the fitting means 42 is fitted so as to be swingable, or the fitting part 42 having a contact surface against the protruding part 22 and a flat surface is applied to the protruding part 22. manhole seismic joint structure characterized by fastening to Rukoto the cylindrical portion 21a to the tube ends 2a through 42. A tubular portion 21a that is externally fitted to a tube end 2a that protrudes into a manhole of a rehabilitated tube 2 that is inserted into a tube of an existing tube 1 connected to the manhole side wall 3 and a flange portion that is applied to the manhole side wall 3 21b, a seismic joint for manholes having an expansion / contraction part 21c between the flange part 21b and the cylinder part 21a, fastening means for fastening the flange part 21b of the joint to the manhole side wall 3, and the rehabilitated pipe 2 This is a manhole seismic joint structure having fastening means for fastening the tubular portion 21a fitted to the pipe end portion 2a to the rehabilitated tube pipe end portion around the entire circumference thereof. In the seismic joint structure for manholes, a projecting portion 22 projecting in a mountain shape on the outer peripheral side of the intermediate portion is formed in the circumferential direction, and the projecting portion 22 is pressed by the fastening means when fastened by the fastening means. , The recording cylinder 21a is formed with a recess 52 having a concave arc cross section instead of forming the protrusion 22 on the outer peripheral side, and a fitting part 53 having a convex arc cross section is fitted into the recess 52 so as to be swingable. manhole seismic joint structure combined the fastening means in the state is characterized by fastening the tubular portion 21a to the tube ends 2a via the fitting portion 53. 3. The seismic joint structure for manholes according to claim 1 or 2, wherein the cylindrical portion 21a has a tapered or curved inner peripheral surface on the side of the insertion port that contacts the end of the tube end when inserted into the tube end 2a. . The said cylinder part 21a has the protrusion 25 for positioning which positions the cylinder part 21a by projecting to an inner peripheral side at the cylinder part end, and latching to the pipe end part end surface of a rehabilitation pipe | tube. The seismic joint structure for manholes according to any one of claims 1 to 3 .