JP2009114771A - Earthquakeproof flexible joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earthquakeproof flexible joint for a builtup manhole, watertight joining a sewage main pipe having a large outside diameter and also simply performing joint work. <P>SOLUTION: In this earthquakeproof flexible joint B for a builtup pipe 5 is fitted to a mounting hole 41 provided in the side wall in a loosely fitting state to make soft joining. The joint includes: a steel-made circular pipe 7, having a bore 71 with an internal thread formed on one side and stoppers 72, 73 provided in the periphery of the tube inner wall; a rubber packing 2 fitted together with a presser plate 20 between the stoppers 72, 73; a bolt 3 and an urethane block 6 fitted to each bore 71 with an internal thread; and a manhole filler 42. Since the earthquakeproof flexible joint B has large fastening force of the bolt 3, strong pressing force can be obtained, so that even in the case of the sewage main pipe 5 having a large outside diameter, watertight joining can be achieved to have excellent water cutoff performance of a joint part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an earthquake-resistant flexible joint that softly joins a sewer main and a manhole through which sewage discharged from a household flows.

In the conventional connection structure with the sewer main, as in Patent Document 1, the sewer main and the manhole are rigidly joined.
JP 2003-90077 A

  In the connection structure between the manhole and the sewer main, there will be a difference in the movement of the manhole and the sewer main due to the seismic motion, but if the sewer main and the manhole are rigidly connected, the difference in the movement May not be absorbed and may cause damage.

  Therefore, the applicant made a test by making a prototype of the flexible joint 100 that tightens the stainless steel band 101 from the manhole and softly joins the manhole and the sewer main pipe 102 (see FIG. 16). The flexible joint 100 has been found to have the following problems.

-When the sewer main pipe 102 has a small diameter, there is no problem, but since the tightening torque of the stainless steel band 101 is small, when the diameter of the sewer main pipe 102 becomes large, the torque becomes insufficient, and water leakage 104 occurs from the joint portion.
-Since the tightening screw 103 of the stainless steel band 101 is tightened in a direction perpendicular to the longitudinal direction of the tool (driver or wrench), it may be difficult to tighten or the tightening screw 103 may not be tightened.
-Skill is required for the tightening work of the stainless steel band 101, and it takes a long time for the tightening work.

A first object of the present invention is to provide an earthquake-resistant flexible joint for a field manhole which can be joined in a watertight manner even with a sewer main having a large outer diameter and can be easily joined.
A second object of the present invention is a method of joining an on-site manhole and a sewer main that can be joined in a watertight manner even in a sewer main having a large outer diameter by using an earthquake-resistant flexible joint and can be easily joined. Is in the provision of.
A third object of the present invention is to provide an earthquake-resistant flexible joint for an assembly manhole that can be joined in a watertight manner even in a sewer main having a large outer diameter by using an earthquake-resistant flexible joint. is there.

(About claim 1)
The seismic flexible joint for on-site manholes has a plurality of threaded holes formed in a ring shape on the tube tip side, and a pair of stoppers that extend inward to sandwich these threaded holes are provided around the inner wall of the pipe A rigid pipe, an elastic packing fitted together with the presser plate between the stoppers, and a bolt attached to each screw hole from the outside of the pipe.

Construction is performed as follows.
A seismic flexible joint is loosely fitted to the end of the sewer main.
Tighten each bolt to press the presser plate, reduce the diameter of the elastic packing, and fix the seismic flexible joint to the end of the loosely sewer main.
Assemble the mold so that the outside of the rigid tube is the side wall of the manhole, and pour the ready-mixed concrete into the mold. The mold frame and the outer diameter Rn of the side wall of the manhole after solidification, the inner diameter Ri on the other side of the steel pipe, and the outer diameter Rg on one side of the steel pipe are matched. It is preferred to make a rigid tube (see FIG. 14). When this structure is adopted, the earthquake-resistant flexible joint does not protrude from the side wall of the manhole after solidification.
After the ready-mixed concrete solidifies, the mold is removed.

The earthquake-resistant flexible joint for on-site manhole according to claim 1 has the following advantages.
The seismic flexible joint for on-site manholes tightens the bolts and presses the holding plate to reduce the diameter of the elastic packing. That is, when the holding plate is pressed by tightening the bolt, the elastic packing is deformed and bites into the lower portion of the stopper, so that water can be stopped.
Since the seismic flexible joint having this structure has a large tightening torque with bolts, a strong pressing force can be obtained, and even a sewer main having a large outer diameter can be joined in a watertight manner and has excellent water-stopping properties at the joining portion. In addition, since the elastic packing is pressed via the presser plate, it is possible to prevent the bolt from getting into the elastic packing.
Since the seismic flexible joint for on-site manhole uses bolts, it can be easily tightened with a normal tool (wrench or the like). Further, since it is sufficient to turn the bolt in parallel with the rigid tube, the tightening operation does not require skill, and the tightening operation is completed in a short time.

(About claim 2)
The seismic flexible joint for on-site manholes has a plurality of threaded holes formed in a ring shape on the tube tip side, and a pair of stoppers that extend inward so as to sandwich these threaded holes. A pair of inner rigid pipes and a plurality of threaded holes formed in a ring shape on the pipe tip side facing the pipe distal end of the inner rigid pipe, and extending in the direction of the inner rigid pipe so as to sandwich the threaded holes The outer rigid tube is provided around the inner wall of the tube, the elastic packing is fitted together with the presser plate between the stoppers, and the bolt is attached to each threaded hole from the outer peripheral side of the inner rigid tube and the outer rigid tube. .

Construction is performed as follows.
A seismic flexible joint is loosely fitted to the end of the sewer main.
Each bolt is tightened to press the holding plate, the elastic packing is reduced in diameter, and the seismic flexible joint is fixed to the end of the loosely sewer main.
The ready-mixed concrete is poured by assembling the mold so that the outer side of the fitting body composed of the inner rigid tube and the outer rigid tube becomes the side wall of the manhole.
After the ready-mixed concrete solidifies, the mold is removed.

The seismic flexible joint for on-site manhole according to claim 2 has the following advantages.
Seismic flexible joints for on-site manholes have a large tightening torque with bolts, so that a strong pressing force can be obtained, and even sewer mains with large outer diameters can be joined in a water-tight manner, and the water-tightness of the joined portion is excellent.
When the presser plate is pressed by tightening the bolt, the elastic packing is deformed and bites into the lower portion of the stopper, so that water can be stopped. In addition, since the elastic packing is pressed via the presser plate, it is possible to prevent the bolt from getting into the elastic packing.
Since the seismic flexible joint for on-site manhole uses bolts, it can be easily tightened with a normal tool (wrench or the like). Further, since it is only necessary to turn the bolt in parallel with each rigid pipe, the tightening operation does not require skill, and the tightening operation is completed in a short time.
Since the fitting body has a double structure including an inner rigid pipe and an outer rigid pipe, the relative displacement between the manhole and the sewer main pipe can be made larger than that of the single structure, and the earthquake resistance is improved.

(Claim 3)
The seismic flexible joint for on-site manholes has a plurality of threaded holes formed in a ring shape on the tube tip side, and a pair of stoppers that extend inward so as to sandwich these threaded holes. And a rigid pipe having a flange on the substantially outer pipe wall, a trapezoidal annular elastic packing fitted together with a presser plate between the stoppers, and a bolt attached to each threaded hole from the outside of the pipe.

Construction is performed as follows.
A seismic flexible joint is loosely fitted to the end of the sewer main.
Each bolt is tightened to press the holding plate, the elastic packing is reduced in diameter, and the seismic flexible joint is fixed to the end of the loosely sewer main.

A columnar cushioning material is packed into the gap between the rigid pipe and the sewer main pipe from the other side of the rigid pipe.
Assemble the mold so that the outside of the rigid tube is the side wall of the manhole, and pour the ready-mixed concrete into the mold.
Assemble the mold so that the outside of the rigid tube is the side wall of the manhole, and pour the ready-mixed concrete into the mold. In addition, the mold and the rigid tube so that the dimensions of the inner diameter Rm and the outer diameter Rn of the side wall of the manhole after solidification coincide with the inner diameter Ri on the other side of the rigid tube and the outer diameter Rg on the one side of the rigid tube. Is preferable (see FIG. 14). When this structure is adopted, the earthquake-resistant flexible joint does not protrude from the side wall of the manhole after solidification.
After the ready-mixed concrete solidifies, the mold is removed.

The seismic flexible joint for on-site manhole according to claim 3 has the following advantages.
Seismic flexible joints for on-site manholes use bolts to press the holding plate and reduce the diameter of the elastic packing, so that a large tightening torque can be obtained, and even a large-diameter sewer main can be joined in a watertight manner. Excellent water-stopping properties at the joint.
When the presser plate is pressed by tightening the bolt, the elastic packing is deformed and bites into the lower portion of the stopper, so that water can be stopped. In addition, since the elastic packing is pressed via the presser plate, it is possible to prevent the bolt from getting into the elastic packing.
Since the seismic flexible joint for on-site manhole uses bolts, it can be easily tightened with a normal tool (wrench or the like). Further, since it is sufficient to turn the bolt in parallel with the rigid tube, the tightening operation does not require skill, and the tightening operation is completed in a short time.

After tightening the bolt and fixing the seismic flexible joint to the end of the sewer main, the columnar cushioning material is packed from the other side of the rigid pipe into the gap between the rigid pipe and the sewer main. The posture change of the rigid tube can be prevented.
Since the flange is provided on the outer wall of the pipe in the center, when the ready-mixed concrete is poured into the formwork, the flange is molded into the concrete and the familiarity between the rigid pipe and ready-made concrete is improved (anchor function). For this reason, after the ready-mixed concrete is solidified, the rigid pipe is firmly fixed to the concrete.
Since the elastic packing is trapezoidal in cross section and has an annular shape, the force that presses the sewer main can be increased, the tightening torque when the diameter of the elastic packing is reduced is large, and the water stoppage is excellent.

(About claim 4)
The seismic flexible joint for on-site manholes has a plurality of threaded holes formed in a ring shape on the tube tip side, and a pair of stoppers that extend inward so as to sandwich these threaded holes. And a rigid tube having an elastic joint attached to the outer periphery of the tube, a trapezoidal annular elastic packing fitted together with a presser plate between the stoppers, and a bolt attached to each threaded hole from the outside of the tube.

  The elastic joint is larger and shorter in diameter than the rigid tube, and has an outer rigid tube with a flange on the tube outer wall at the center, a small cylindrical part that fits the outer periphery of the rigid tube, and the outer periphery of the outer rigid tube at the outer periphery. An elastic cylindrical body having a large diameter cylindrical portion to be fitted, a large diameter cylindrical portion positioned between the small diameter cylindrical portion and the large diameter cylindrical portion, and a tightening disposed on the outer periphery of the small diameter cylindrical portion and the outer periphery of the large diameter cylindrical portion. It consists of a band.

Construction is performed as follows.
The large cylindrical portion of the elastic cylindrical body is fitted on the outer periphery of the distal end of the outer rigid tube, and a fastening band disposed on the outer periphery of the large cylindrical portion is tightened to fix the elastic cylindrical body to the outer rigid tube.
Further, the small diameter cylindrical portion of the elastic joint having the tightening band disposed on the outer periphery of the small diameter cylindrical portion of the elastic cylindrical body is fitted into the rigid tube, and the tightening band is tightened to fix the elastic joint to the rigid tube.

This seismic flexible joint is loosely fitted to the end of the sewer main.
Each bolt is tightened to press the holding plate, the elastic packing is reduced in diameter, and the seismic flexible joint is fixed to the end of the loosely sewer main.

An annular sealing cushioning material is disposed outside the distal end of the rigid tube.
The formwork is assembled so that the outer side of the elastic joint and the cushioning material becomes the side wall of the manhole, and the ready-mixed concrete is poured into the formwork.
After the ready-mixed concrete solidifies, the mold is removed.

The seismic flexible joint for on-site manhole according to claim 4 has the following advantages.
Seismic flexible joints for on-site manholes use bolts to press the holding plate and reduce the diameter of the elastic packing, so that a large tightening torque can be obtained, and even a large-diameter sewer main can be joined in a watertight manner. Excellent water-stopping properties at the joint.

When the bolt is tightened and the presser plate is pressed, the elastic packing is deformed and bites into the lower portion of the stopper, so that water can be stopped. In addition, since the elastic packing is pressed via the presser plate, it is possible to prevent the bolt from getting into the elastic packing.
Since the seismic flexible joint for on-site manhole uses bolts, it can be easily tightened with a normal tool (wrench or the like). Further, since it is sufficient to turn the bolt in parallel with the rigid tube, the tightening operation does not require skill, and the tightening operation is completed in a short time.

  In addition to the inclination (refer to FIG. 5; α ≦ 5 °) when the manhole and the sewer main are displaced relative to each other due to an earthquake or the like, vertical displacement (vertical direction) is also absorbed by the distance h (refer to FIG. 17). be able to.

Since the flange is provided on the outer wall of the tube at the center of the outer rigid tube, when the ready-mixed concrete is poured into the formwork, the flange is molded into the concrete and the familiarity between the outer rigid tube and the ready-mixed concrete is improved (anchor function ). For this reason, after the ready-mixed concrete is solidified, the outer rigid tube is firmly fixed to the concrete.
Since the elastic packing is trapezoidal in cross section and has an annular shape, the force that presses the sewer main can be increased, the tightening torque when the diameter of the elastic packing is reduced is large, and the water stoppage is excellent.

(Claim 5)
Using a seismic flexible joint, the following procedure will join the manhole and the sewer main. An earthquake-resistant flexible joint is loosely fitted from one side of the rigid pipe to the end of the sewer main pipe. In addition, a flange is provided on the outer wall of the substantially center of the rigid tube of the earthquake-resistant flexible joint, and a plurality of threaded holes are formed in a ring shape on one side of the rigid tube, and a pair of the holes is sandwiched between the threaded holes. A stopper is provided around the inner wall of the rigid tube inward. An annular elastic packing having a trapezoidal cross section is fitted between the stoppers together with the presser plate, and bolts are attached to the threaded holes from the outside of the pipe.

Next, each bolt is tightened to press the presser plate, the elastic packing is reduced in diameter, and the seismic flexible joint is fixed to the rigid tube.
Next, a columnar cushioning material is packed into the gap between the rigid pipe and the sewer main pipe from the other side of the rigid pipe.
Next, the mold is assembled so that the outside of the rigid pipe of the earthquake-resistant flexible joint becomes the side wall of the manhole after solidification, and the ready-mixed concrete is poured into the mold, and the mold is removed after the concrete is solidified.

The method for joining the on-site manhole and the sewer main of claim 4 has the following advantages.
Tighten each bolt attached to the threaded hole of the rigid pipe and press the holding plate to reduce the diameter of the elastic packing with a trapezoidal cross section and fix the seismic flexible joint to the sewer main. The torque can be increased and water can be joined in a watertight manner even with a sewer main having a large outer diameter, and the water-tightness of the joint is excellent. Moreover, since the bolt is adopted, it can be easily tightened with a normal tool (such as a wrench). Furthermore, since it is sufficient to turn the bolt in parallel with the rigid tube, the tightening operation does not require skill, and the tightening operation is completed in a short time. In addition, since the elastic packing is pressed via the presser plate, it is possible to prevent the bolt from getting into the elastic packing.

After tightening the bolt and fixing the seismic flexible joint to the end of the sewer main, the columnar cushioning material is packed from the other side of the rigid pipe into the gap between the rigid pipe and the sewer main. The posture change of the rigid pipe during work can be prevented.
Since the flange is provided on the outer wall of the pipe in the center, when the ready-mixed concrete is poured into the formwork, the flange is molded into the concrete and the familiarity between the rigid pipe and ready-made concrete is improved (anchor function). For this reason, after the ready-mixed concrete is solidified, the rigid pipe is firmly fixed to the concrete.

(About claim 6)
The seismic flexible joint for assembly manholes has a plurality of threaded holes formed in a ring shape on one side of the pipe, and a pair of stoppers are placed around the inner wall of the pipe so as to sandwich the threaded holes. A rigid pipe provided, an elastic packing fitted together with the presser plate between the stoppers, and a bolt attached to each screwed hole from the outside of the pipe.

The construction to softly join the sewer main to the assembly manhole using the earthquake-resistant flexible joint is performed as follows.
The end of the sewer main is fitted into the mounting hole provided on the side wall of the assembly manhole. The seismic flexible joint is fitted into the gap between the sewer main pipe and the mounting hole with the other side of the rigid pipe as the front side. In the earthquake-resistant flexible joint, a plurality of screw holes are formed in a ring shape on one side of the pipe, and a pair of stoppers are provided around the pipe inner wall so as to sandwich the screw holes. A rigid pipe, an elastic packing fitted together with the presser plate between the stoppers, and a bolt attached to each screw hole from the outside of the pipe.

Next, each bolt is tightened from inside the manhole to press the holding plate, the elastic packing is reduced in diameter, and the seismic flexible joint is fixed to the sewer main.
The manhole filler is packed into the gap between the rigid tube and the mounting hole from the inside of the manhole to stop water.

The seismic flexible joint for an assembly manhole according to claim 5 has the following advantages.
The seismic flexible joint for assembly manholes tightens the bolts and presses the presser plate to reduce the diameter of the elastic packing, so the tightening torque can be increased, and even a large sewer main can be watertightly joined. Excellent water-stopping properties at joints.
When the presser plate is pressed by tightening the bolt, the elastic packing is deformed and bites into the lower portion of the stopper, so that water can be stopped. In addition, since the elastic packing is pressed via the presser plate, it is possible to prevent the bolt from getting into the elastic packing.
Since the seismic flexible joint for assembly manholes employs bolts, it can be easily tightened with an ordinary tool (wrench or the like). Further, since it is sufficient to turn the bolt in parallel with the rigid tube, the tightening operation does not require skill, and the tightening operation is completed in a short time.

(About claim 7)
The seismic flexible joint for assembly manholes has a plurality of threaded holes formed in a ring shape on one side of the pipe, and a pair of stoppers are placed around the inner wall of the pipe so as to sandwich the threaded holes. A rigid pipe that is installed, a columnar cushioning material that is bonded to the inner wall of the pipe on the other side of the rigid pipe, plugs the gap between the rigid pipe and the sewer main pipe, and a trapezoidal cross section that is fitted with a presser plate between the stoppers Elastic packing and a bolt attached to each threaded hole from the outside of the tube.

The construction to softly join the sewer main to the assembly manhole using the earthquake-resistant flexible joint is performed as follows.
The end of the sewer main is fitted into the mounting hole provided on the side wall of the assembly manhole. The seismic flexible joint is fitted into the gap between the sewer main pipe and the mounting hole with the other side of the rigid pipe as the front side. In the earthquake-resistant flexible joint, a plurality of screw holes are formed in a ring shape on one side of the pipe, and a pair of stoppers are provided around the pipe inner wall so as to sandwich the screw holes. A rigid pipe that is bonded to the inner wall of the pipe on the other side of the rigid pipe, and a columnar cushioning material that closes the gap between the rigid pipe and the sewer main pipe, and a trapezoidal cross section that is fitted with a presser plate between the stopper and an annular elastic A packing and a bolt attached to each threaded hole from the outside of the pipe are provided.

Next, each bolt is tightened from inside the manhole to press the holding plate, the elastic packing is reduced in diameter, and the seismic flexible joint is fixed to the sewer main.
The manhole filler is packed into the gap between the rigid tube and the mounting hole from the inside of the manhole to stop water.

The seismic flexible joint for an assembly manhole according to claim 7 has the following advantages.
The seismic flexible joint for assembly manholes tightens the bolts and presses the presser plate to reduce the diameter of the elastic packing, so the tightening torque can be increased, and even a large sewer main can be watertightly joined. Excellent water-stopping properties at joints.
When the presser plate is pressed by tightening the bolt, the elastic packing is deformed and bites into the lower portion of the stopper, so that water can be stopped. In addition, since the elastic packing is pressed via the presser plate, it is possible to prevent the bolt from getting into the elastic packing.
Since the seismic flexible joint for assembly manholes employs bolts, it can be easily tightened with an ordinary tool (wrench or the like). Further, since it is sufficient to turn the bolt in parallel with the rigid tube, the tightening operation does not require skill, and the tightening operation is completed in a short time.

Since a ring-shaped elastic packing with a trapezoidal cross section is fitted together with the presser plate between the stoppers, the force for pressing the sewer main can be increased, the tightening torque when the diameter of the elastic packing is reduced is large, and the water stoppage is excellent.
Since the columnar buffer material is bonded to the inner wall surface of the pipe on the other side of the rigid pipe, it is possible to prevent the rigid pipe from changing in posture when the rigid pipe is pressed into the sewer main pipe and the bolt is tightened.

(Claims 8 and 9)
An earthquake-resistant flexible joint is manufactured by matching the dimensions of the inner diameter and outer diameter of the side wall of the assembly manhole with the dimensions of the inner diameter on the other side of the rigid tube and the outer diameter on one side of the rigid tube.
When this structure is adopted, the earthquake-resistant flexible joint does not protrude into the wall thickness of the side wall of the manhole, and attachment is possible even if there is no space outside the manhole. That is, it is economical because it is not necessary to increase the diameter of the shaft.

  Seismic flexible joints for assembly manholes, where the end of the sewer main pipe is loosely fitted into the circular mounting hole provided on the side wall and softly joined, have a plurality of threaded holes on one side of the pipe A steel circular tube with a pair of stoppers inwardly facing the inner wall of the pipe so as to sandwich these threaded holes, a rubber packing fitted with a presser plate between the stoppers, And a bolt attached to each threaded hole.

  To softly join the sewer main to the assembly manhole using this seismic flexible joint, tighten the bolts from inside the manhole, press the presser plate, reduce the diameter of the rubber packing, and make the sewer main seismic resistant. The flexible joint is fixed, and the manhole filler is filled from the inside of the manhole into the gap between the steel circular pipe and the mounting hole.

The seismic flexible joint for assembly manholes tightens the bolts and presses the presser plate to reduce the diameter of the elastic packing, so the tightening torque can be increased, and even a large sewer main can be watertightly joined. Excellent water-stopping properties at joints.
Since the seismic flexible joint for assembly manholes employs bolts, it can be easily tightened with an ordinary tool (wrench or the like). Further, since it is sufficient to turn the bolt in parallel with the rigid tube, the tightening operation does not require skill, and the tightening operation is completed in a short time.

A first embodiment (corresponding to claims 1, 3 and 5) of the present invention will be described with reference to FIGS.
As shown in FIG. 4 and the like, the seismic flexible joint A for on-site manholes is a steel circular pipe 1 (in which stoppers 12 and 13 extending inwardly so as to sandwich a group of threaded holes 11 are provided around the inner wall of the pipe ( A rigid tube), a rubber packing 2 (elastic packing) fitted together with the presser plate 20 between the stoppers 12 and 13, and a bolt 3 attached to the screwed hole 11 from the outside of the tube.

The threaded hole 11 is made by fitting a brazed nut 15 into a plurality of communication holes 14 formed in a ring shape on the distal end side (the right side in the figure) of the steel circular tube 1 and welding them. A female screw may be cut in the communication hole 14 itself of the steel circular tube 1.
The inwardly extending stoppers 12 and 13 are plate-like and welded to the pipe inner walls on both sides of the threaded hole 11.
A plate-like flange 16 extending outward is welded to the outer wall of the tube at the center of the steel circular tube 1.

  The rubber packing 2 has an annular shape and has a hollow portion 21 inside. The rubber packing 2 has a trapezoidal cross section, and the pressing surface that presses the outer periphery of the sewer main pipe 5 is narrow. A plurality of ribs 22 are provided on the outer peripheral surface of the rubber packing 2 fitted between the stoppers 12 and 13.

Next, the construction procedure of the soft joining between the on-site manhole and the sewer main using the seismic flexible joint A for on-site manhole will be described.
(1) The wide portion of the rubber packing 2 is fitted together with the presser plate 20 between the stoppers 12 and 13 of the steel circular tube 1. Then, the bolt 3 is screwed into the threaded hole 11 from the outside of the pipe and attached {see (a) of FIG. 2}.

(2) The front end 51 of the sewer main pipe 5 is faced to the part to be joined to the hardened in-situ manhole 4, and the seismic flexible joint A is connected to the rubber packing 2 fitting side (steel circular pipe 1). From the one side) and loosely fit to the outer periphery of the tip 51 of the sewer main pipe 5. Then, the bolt 3 is sufficiently tightened from the outside of the tube.
Since the presser plate 20 is pressed by the bolt 3, the rubber packing 2 is deformed and bites into the lower portions of the stoppers 12 and 13, so that water can be stopped and the earthquake-resistant flexible joint A is fixed to the sewer main 5. {See FIG. 2 (b)}. In addition, since the rubber packing 2 is pressed via the presser plate 20, it is possible to prevent the bolt 3 from entering the rubber packing 2.

(3) A columnar urethane block 6 (buffer material) is packed into a plurality of positions in the gap between the steel circular pipe 1 and the sewer main pipe 5 by press-fitting from the other side of the steel circular pipe 1 {FIG. 3 (See (a)}.
(4) The mold 17 is assembled so that the outer side of the steel circular pipe 1 of the seismic flexible joint A after hardening becomes the side wall of the cast-in-place manhole 4 after hardening, and the ready-mixed concrete 18 is poured into the mold 17 {FIG. 3 (b)}. Then, the mold 17 is demolded after the concrete is solidified.

This embodiment has the following advantages.
The seismic flexible joint A for on-site manholes is flexible, so even if the sewer main 5 is displaced approximately 5 ° due to an earthquake or the like after construction, the joint part While being able to maintain a water-stopping property, the on-site manhole 4 and the sewer main 5 are not damaged.

The seismic flexible joint A for on-site manhole is tightened more than the flexible joint 100 of FIG. 14 using a stainless steel band because the bolt 3 is tightened to press the holding plate 20 and the rubber packing 2 is reduced in diameter. A large torque can be obtained, and even the sewer main 5 having a large outer diameter can be joined in a watertight manner, and the water stoppage of the joined portion is excellent.
Since the pressing plate 20 is pressed by the bolt 3, the rubber packing 2 is deformed and bites into the lower portions of the stoppers 12 and 13, so that water can be reliably stopped. In addition, since the rubber packing 2 is pressed via the presser plate 20, it is possible to prevent the bolt 3 from entering the rubber packing 2. Further, in the case of a sewage main having a large outer diameter, the tightening torque force may be increased by increasing the diameter of the bolt 3.

  Since the earthquake-resistant flexible joint A for on-site manhole uses the bolt 3, it can be easily tightened with a normal tool (wrench or the like). Further, since it is sufficient to turn the bolt 3 with a tool in parallel with the steel tube 1, the tightening operation does not require skill, and the tightening operation is completed in a short time.

  After the bolt 3 is tightened and the seismic flexible joint A is fixed to the tip 51 of the sewer main 5, a columnar urethane block 6 is inserted into the steel circle in the gap between the steel circular pipe 1 and the sewer main 5. Since the structure is packed from the other side of the tube 1, the water stoppage is improved and the posture of the steel circular tube 1 can be stabilized.

  Since the flange 16 is provided on the substantially outer wall of the pipe, when the ready-mixed concrete 18 is poured into the formwork 17, the flange 16 is molded into the ready-mixed concrete 18 so that the familiarity between the steel circular pipe 1 and the ready-mixed concrete 18 occurs. Get better (anchor function). For this reason, when the ready-mixed concrete 18 is solidified, the steel circular tube 1 is firmly fixed to the concrete-made man-made manhole 4.

  Since the rubber packing 2 is trapezoidal in cross section and has an annular shape, the force for pressing the sewer main pipe 5 can be increased, and the tightening torque when the rubber packing 2 is reduced in diameter is large. The connection structure M with the sewer main is excellent in water blocking.

  Next, a second embodiment (corresponding to claims 6 and 7) of the present invention will be described with reference to FIGS. As shown in FIG. 9 and the like, the seismic flexible joint B for an assembly manhole has a steel circular pipe 7 (in which stoppers 72 and 73 are provided around the inner wall of the pipe inward so as to sandwich the threaded hole 71 group. A rigid tube), a rubber packing 2 (elastic packing) fitted together with the presser plate 20 between the stoppers 72 and 73, a bolt 3 attached to the threaded hole 71 from the outside of the tube, and a tube on the other side of the steel circular tube 7 A columnar urethane block 6 (buffer material) bonded to the wall surface is provided.

As in the first embodiment, the threaded hole 71 is formed by fitting a brazed nut 15 into a communication hole 70 formed in a ring shape on one side (the left side in the figure) of the steel circular tube 1 and welding it. It is made. A female thread may be cut in the communication hole 70 itself of the steel circular tube 7.
The stoppers 72 and 73 are plate-like, and are welded inward to the pipe inner walls on both sides of the threaded hole 71.

  The rubber packing 2 has an annular shape as in the first embodiment, and has a hollow portion 21 inside. The rubber packing 2 has a trapezoidal cross section, and the pressing surface that presses the outer periphery of the sewer main pipe 5 is narrow. A plurality of ribs 22 are provided on the outer peripheral surface of the wide portion of the rubber packing 2 that fits between the stoppers 72 and 73.

  Next, the construction procedure of the soft joining between the assembly manhole and the sewer main using the seismic flexible joint B for the assembly manhole will be described.

(1) The wide portion of the rubber packing 2 is fitted between the stoppers 72 and 73 of the steel circular tube 7 together with the holding plate 20, and the bolt 3 is slightly screwed into the threaded hole 71 from the outside of the tube. Further, the urethane block 6 is bonded to the inner wall surface of the steel circular pipe 7 on the other side (right side in the figure) (see FIG. 7). The urethane block 6 has such a size that when the seismic flexible joint B is press-fitted, the gap between the steel circular pipe 7 and the sewer main pipe 5 is blocked to stop water.

(2) With the tip 51 of the sewer main pipe 5 facing the mounting hole 41 of the assembly manhole 40, the seismic flexible joint B is fitted from the urethane block 6 side (the other side of the steel circular pipe 7). And press-fit into the outer periphery of the tip 51 of the sewer main pipe 5 (see FIG. 7).

(3) Fully tighten the bolt 3 from the assembly manhole 40. Since the pressing plate 20 is pressed by the bolt 3, the rubber packing 2 is deformed and bites into the lower portions of the stoppers 72 and 73, so that water can be stopped and the seismic flexible joint B is fixed to the sewer main 5. {See (a) of FIG. 3}. In addition, since the rubber packing 2 is pressed via the presser plate 20, it is possible to prevent the bolt 3 from entering the rubber packing 2.

(4) Assembling into the gap between the steel circular tube 7 and the mounting hole 41, the manhole filler 42 is packed from the inside of the manhole 40 and water is stopped (see FIG. 6).

This embodiment has the following advantages.
The seismic flexible joint B for the assembly manhole tightens the bolt 3 and presses the presser plate 20 to reduce the diameter of the rubber packing 2, so that a large tightening torque can be obtained, and the sewer main 5 having a large outer diameter is watertight. Can be joined together and has excellent water-stopping properties at the joint.
Since the pressing plate 20 is pressed by the bolt 3, the rubber packing 2 is deformed and bites into the lower portions of the stoppers 72 and 73, so that water can be reliably stopped. In addition, since the rubber packing 2 is pressed via the presser plate 20, it is possible to prevent the bolt 3 from entering the rubber packing 2.

  Since the seismic flexible joint B for the assembly manhole employs the bolt 3, it can be easily tightened with a normal tool (such as a wrench). Further, since it is sufficient to turn the bolt 3 in parallel with the steel circular tube 7, the tightening operation does not require skill, and the tightening operation is completed in a short time.

  Since the annular rubber packing 2 having a trapezoidal cross section is fitted together with the presser plate 20 between the stoppers 72 and 73, the force for pressing the sewer main pipe 5 can be increased, and the tightening force when the diameter of the rubber packing 2 is reduced is increased. Large and excellent in water-stopping properties.

  Since the columnar urethane block 6 is bonded to the inner wall surface of the other side of the steel circular pipe 7, the steel circular pipe is used when the bolt 3 is tightened after the seismic flexible joint B is pressed into the sewer main pipe 5. 7 posture fluctuation can be prevented.

  Since the rubber packing 2 is trapezoidal in cross section and has an annular shape, the force for pressing the sewer main pipe 5 can be increased, the tightening torque when the rubber packing 2 is reduced in diameter is large, and the seismic flexible joint B for assembly manholes is used. The connection structure N between the assembly manhole and the sewer main is excellent in water blocking.

The present invention includes the following embodiments in addition to the above embodiments.
a. In the case of a spot-type manhole 4 having a polygon such as a box culvert, the steel circular pipe 7 uses a polygon (see FIG. 10). In addition, when the cross section of the mounting hole after hardening is a square, the steel circular pipe 74 with a square cross section is used.

b. When the sewer main is not circular but polygonal, such as a box culvert, the steel circular pipe 7 uses polygons (see FIGS. 11 and 12). In addition, when the cross section of the mounting hole is square, a steel circular tube 75 having a square cross section is used.
In FIG. 12, 3 is a bolt, 81 is an elastic packing, 82 is a presser plate (whole circumference), 83 is a steel circular pipe having a threaded hole, and 84 is a box culvert.

c. As shown in FIG. 13, the seismic flexible joint for on-site manholes may have a double structure (corresponding to claim 2). 91 is a long steel circular pipe (long rigid pipe), and stoppers 92 and 93 are provided around the inner wall of the pipe. Reference numeral 94 denotes a short steel circular pipe (short rigid pipe), and stoppers 95 and 96 extending in the direction of the long steel circular pipe are provided around the inner wall of the pipe.

d. Steel so that the inner diameter Rm and the outer diameter Rn of the side wall of the manhole after solidification and the inner diameter Ri on the other side of the steel circular tube 1 and the outer diameter Rg on one side of the steel circular tube 1 coincide with each other. It is preferable to make the tube 1 and the mold (see FIG. 14). When this structure is adopted, the earthquake-resistant flexible joint does not protrude from the side wall of the manhole 4 after solidification. In addition, if the earthquake-resistant flexible joint does not protrude from the side wall 4, it is not always necessary to match.

e. It is preferable to make a steel circular tube by matching the inner diameter and outer diameter of the side wall of the assembly manhole with the inner diameter of the other side of the steel circular tube and the outer diameter of one side of the steel circular tube. Yes (corresponding to claim 7).

f. In the field-placed manhole, the formwork is assembled so that the outer side of the rigid tube becomes the side wall of the manhole, and the ready-mixed concrete is poured. The frame 98 may be assembled.

g. In the on-site manhole shown in FIG. 1, the direction of the earthquake-resistant flexible joint A may be reversed. h. The elastic packing fitted together with the holding plate between the stoppers may be water-expanded rubber.

i. As shown in FIG. 17, the seismic flexible joint C for on-site manhole is larger in diameter and shorter than the rigid tube 201, and has an outer rigid tube 203 provided with a flange 202 on a substantially central tube outer wall, and a substantially central portion of the rigid tube 201. A small-diameter cylindrical portion 204 that externally fits the outer periphery, a large-diameter cylindrical portion 205 that externally fits the outer periphery of the outer rigid tube 203, and a large-diameter portion 206 positioned between the small-diameter cylindrical portion 204 and the large-diameter cylindrical portion 205. A structure in which an elastic joint 209 including an elastic cylindrical body 207 and fastening bands 208 and 208 disposed on the outer periphery of the small diameter cylindrical portion 204 and the outer periphery of the large diameter cylindrical portion 205 is attached to the outer periphery of the rigid tube 201. It may be (corresponding to claim 4).

  This earthquake-resistant flexible joint C has an amount corresponding to the distance h (see FIG. 17) in addition to the inclination (see FIG. 5; α ≦ 5 °) when the manhole and the sewer main 5 are relatively displaced by an earthquake or the like. Vertical displacement (up and down direction) can also be absorbed.

j. In claim 4, there may be no annular sealing cushioning material or flange.

It is sectional drawing of the connection structure of an in-situ manhole and a sewer main using the earthquake-resistant flexible joint for in-situ manholes. (A) is an explanatory view showing a place where a rubber packing is fitted together with a presser plate between stoppers, and a seismic flexible joint attached by screwing a bolt into a threaded hole is loosely fitted to the distal end of a sewer main, (B) It is explanatory drawing which shows the place which fixes a seismic flexible joint to a sewer main by screwing in a volt | bolt. (A) is explanatory drawing which shows the place which puts a urethane block in the clearance gap between a steel circle pipe and a sewer main, (b) assembled the formwork and poured ready-mixed concrete into it It is explanatory drawing which shows the place. It is sectional drawing of the earthquake-resistant flexible joint for on-site manholes. It is explanatory drawing which shows the state by which the steel pipe was relatively displaced (state of a continuous line) by the earthquake etc. after construction of the on-site manhole. It is sectional drawing of the connection structure of an assembly manhole and a sewer main using the earthquake-resistant flexible joint for assembly manholes. The seismic flexible joint for assembly manholes is made of steel, with the presser plate and the wide part of the rubber packing fitted between the stoppers, bolts are slightly screwed into the threaded holes, and the urethane block is bonded to the inner wall of the pipe on the other side. It is explanatory drawing which shows the place press-fitted between a circular pipe and a sewer main. It is explanatory drawing which shows the place which fixes a seismic flexible joint for assembly manholes to a sewer main by screwing a volt | bolt in a threaded hole. It is sectional drawing of the earthquake-resistant flexible joint for assembly manholes. It is explanatory drawing of the connection structure of the site-placed manhole and sewer main using an earthquake-resistant flexible joint in the site-placed manhole when the cross section of the mounting hole after hardening is square. It is explanatory drawing of the connection structure of the assembly manhole using a seismic flexible joint and a sewer main in the assembly manhole when the cross section of an attachment hole is square. It is explanatory drawing of the connection structure of the assembly manhole using a seismic flexible joint and a sewer main in the assembly manhole when the cross section of an attachment hole is square. It is explanatory drawing of the earthquake-resistant flexible joint of a double structure for on-site manholes. Seismic resistance for on-site manholes in which the inner and outer diameters of the manhole side wall after solidification match the inner diameter of the other side of the steel tube and the outer diameter of one side of the steel tube It is explanatory drawing of a flexible joint. It is explanatory drawing of the earthquake-resistant flexible joint for field-placed manholes which arranged the buffer material and assembled the inner formwork and the outer formwork. It is explanatory drawing of the connection structure of a manhole and a sewer main using the flexible joint which clamp | tightens a stainless steel band from the inside of a manhole and softly joins a manhole and a sewer main. It is explanatory drawing of the connection structure of a field manhole and a sewer main using the seismic flexible joint of the structure where the elastic coupling was attached to the pipe outer periphery.

Explanation of symbols

A, C Seismic flexible joint for on-site manhole B Seismic flexible joint for assembly manhole 1, 7 Steel circular pipe (rigid pipe)
2 Rubber packing (elastic packing)
3 Bolt 4 On-site manhole 5 Sewer main 6 Urethane block (buffer material)
11 Screwed holes 12, 13, 92, 93 Stopper 16 Flange 17 Mold frame 18 Ready-mixed concrete 20 Press plate 41 Mounting hole 42 Manhole filler 51 Tip (tip)
91 Long steel circular pipe (inner rigid pipe)
94 Short steel circular tube (outer rigid tube)
201 Rigid tube 202 Flange 203 Outer rigid tube 204 Diameter small cylinder portion 205 Diameter large cylinder portion 206 Diameter expansion portion 207 Elastic cylindrical body 208 Clamping band 209 Elastic joint

Claims (9)

A rigid tube having a plurality of threaded holes formed in a ring shape on the tube tip side, and a pair of stoppers extending inwardly so as to sandwich these threaded holes,
An elastic packing fitted together with the presser plate between the stoppers;
An earthquake-resistant flexible joint for on-site manholes comprising a bolt attached to each threaded hole from the outside of the pipe,
Tighten each bolt to press the holding plate, reduce the diameter of the elastic packing, and fix the seismic flexible joint to the end of the sewer main that is loosely fitted,
Assemble the formwork so that the outside of the rigid tube is the side wall of the manhole and pour the ready-mixed concrete,
An earthquake-resistant flexible joint for on-site manholes that softly joins on-site manholes and sewer mains by removing the mold after solidifying the concrete. A plurality of threaded holes are formed in a ring shape on the tube tip side, and a pair of stoppers extending inwardly so as to sandwich these threaded holes, an inner rigid tube around the inner wall of the pipe,
A plurality of threaded holes are formed in a ring shape on the tube tip side facing the tube tip of the inner rigid tube, and a pair of stoppers extending in the direction of the inner rigid tube so as to sandwich the threaded holes are provided around the inner wall of the tube. An outer rigid tube,
Elastic packing fitted together with the presser plate between each stopper;
An earthquake-resistant flexible joint for on-site manholes comprising a bolt attached to each threaded hole from the outer peripheral side of the inner rigid tube and the outer rigid tube,
Tighten each bolt to press the holding plate, reduce the diameter of the elastic packing, and fix the seismic flexible joint to the end of the sewer main that is loosely fitted,
Assembling the mold so that the outer side of the fitting body composed of the inner rigid tube and the outer rigid tube is the side wall of the manhole, and pouring the ready-mixed concrete,
A seismic flexible joint for on-site manholes that softly joins on-site manholes and sewer mains by removing the mold after solidifying the concrete. A plurality of threaded holes are formed in a ring shape on the tube tip side, and a pair of stoppers that extend inward so as to sandwich these threaded holes are provided around the inner wall of the pipe, and a flange is provided on the substantially outer wall of the pipe A rigid tube,
An elastic packing with a trapezoidal cross section that is fitted with a presser plate between stoppers, and
An earthquake-resistant flexible joint for on-site manholes comprising a bolt attached to each threaded hole from the outside of the pipe,
Tighten each bolt to press the holding plate, reduce the diameter of the elastic packing, and fix the seismic flexible joint to the end of the sewer main that is loosely fitted,
In the gap between the rigid pipe and the sewer main pipe, a columnar cushioning material is packed from the other side of the rigid pipe,
Assemble the formwork so that the outside of the rigid tube is the side wall of the manhole and pour the ready-mixed concrete,
An earthquake-resistant flexible joint for on-site manholes that softly joins on-site manholes and sewer mains by removing the mold after solidifying the concrete. A plurality of threaded holes are formed in a ring shape on the tube tip side, and a pair of stoppers that extend inward so as to sandwich these threaded holes are provided around the inner wall of the pipe, and an elastic joint is attached to the outer circumference of the pipe Tube,
An elastic packing with a trapezoidal cross section that is fitted with a presser plate between stoppers, and
An earthquake-resistant flexible joint for on-site manholes comprising a bolt attached to each threaded hole from the outside of the pipe,
The elastic joint is larger and shorter in diameter than the rigid tube, and includes an outer rigid tube having a flange on a substantially central tube outer wall, a small-diameter tubular portion that externally fits the substantially central outer periphery of the rigid tube, and the outer rigid tube. An elastic cylindrical body having a large-diameter cylindrical portion that externally fits the outer periphery of the tip, an enlarged-diameter portion positioned between the small-diameter cylindrical portion and the large-diameter cylindrical portion, an outer periphery of the small-diameter cylindrical portion, and the large-diameter cylindrical portion A fastening band disposed on the outer periphery of the
The elastic joint is fixed to the rigid tube by fitting the elastic joint to the outer periphery of the rigid tube and tightening the fastening band.
Tighten each bolt to press the holding plate, reduce the diameter of the elastic packing, and fix the seismic flexible joint to the end of the sewer main that is loosely fitted,
An annular sealing cushioning material is disposed outside the distal end of the rigid tube,
Assembling the mold so that the outer side of the elastic joint and the cushioning material is the side wall of the manhole, and pouring ready-mixed concrete,
A seismic flexible joint for on-site manholes that softly joins on-site manholes and sewer mains by removing the mold after solidifying the concrete. A flange is provided on the substantially central outer wall of the rigid tube, and a plurality of screw holes are formed in a ring shape on one side of the rigid tube, and a pair of stoppers are formed inwardly so as to sandwich the screw holes. A seismic flexible joint is installed around the inner wall of the rigid pipe, and an elastic elastic ring with a trapezoidal cross section is fitted between the stopper together with the presser plate. Loosely fitted to the end of the tube,
Tighten each bolt to press the presser plate, reduce the diameter of the elastic packing, and fix the seismic flexible joint to the sewer main,
In the gap between the rigid pipe and the sewer main pipe, a columnar cushioning material is packed from the other side of the rigid pipe,
Assemble the mold so that the outer side of the rigid tube of the seismic flexible joint becomes the side wall of the manhole after solidification, and pour the ready-mixed concrete into the mold,
A method for joining a manhole and a sewer main, which is completed by demolding the formwork after solidifying the concrete. A seismic flexible joint that softly joins the sewer main to the assembly manhole by fitting the end of the sewer main into a loose fit state into the mounting hole provided in the side wall of the assembly manhole,
In the earthquake-resistant flexible joint, a plurality of screw holes are formed in a ring shape on one side of the pipe, and a pair of stoppers are provided around the pipe inner wall so as to sandwich the screw holes. A rigid tube and an elastic packing that is fitted with the presser plate between the stopper and
With bolts attached to each threaded hole from the outside of the tube,
Tighten each bolt from within the manhole to press the holding plate, reduce the diameter of the elastic packing, and fix the seismic flexible joint to the sewer main,
A seismic flexible joint for an assembly manhole, wherein a sewer main pipe is softly joined to the assembly manhole by filling a manhole filling material into the gap between the rigid tube and the mounting hole and stopping water. A seismic flexible joint that softly joins the sewer main to the assembly manhole by fitting the end of the sewer main into a loose fit state into the mounting hole provided in the side wall of the assembly manhole,
In the earthquake-resistant flexible joint, a plurality of screw holes are formed in a ring shape on one side of the pipe, and a pair of stoppers are provided around the pipe inner wall so as to sandwich the screw holes. A rigid pipe, and a columnar cushioning material that is bonded to a pipe inner wall surface on the other side of the rigid pipe and closes a gap between the rigid pipe and the sewer main pipe,
An elastic packing with a trapezoidal cross section that is fitted with a presser plate between stoppers, and
With bolts attached to each threaded hole from the outside of the tube,
Press-fit the seismic flexible joint from the manhole to the end of the sewer main,
Tighten each bolt from the manhole to press the holding plate, reduce the diameter of the elastic packing, and fix the seismic flexible joint to the sewer main,
A seismic flexible joint for assembly manholes, wherein a sewer main pipe is softly joined to an assembly manhole by filling a manhole filler into the gap between the rigid tube and the mounting hole and stopping the water. .   6. The in-situ manhole according to claim 5, wherein the dimensions of the inner diameter and the outer diameter of the side wall of the manhole are matched with the dimensions of the inner diameter of the other side of the rigid tube and the outer diameter of the one side of the rigid tube. And joining method with the sewer main.   The assembled manhole according to claim 6, wherein the dimensions of the inner diameter and the outer diameter of the side wall of the manhole are matched with the dimensions of the inner diameter on the other side of the rigid tube and the outer diameter on the one side of the rigid tube. Seismic flexible joint for use.

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