JP2009057714A - Structure for connecting manhole and sewer main together - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for connecting a manhole and a sewer main together, which facilitates construction, which is superior in cut-off properties, and which does not decrease in the strength of the manhole. <P>SOLUTION: This structure A for connecting the manhole and the sewer main together is constructed through the following steps: a steel pipe 2, into which rubber packing 4 is fitted, is pressed into a mounting hole 12 from the inside of the manhole 1 so that a locking portion 24 can abut on an inner wall 13 of the manhole; a large-diameter portion 31 of a cylindrical rubber body 3 is fitted into the outer periphery of the steel pipe 2 protruding to the outside of the manhole 1, on the outside of the manhole 1; and the sewer main 5 is propelled in the cylindrical rubber body 3, and fixed to the cylindrical rubber body 3 by fastening a stainless steel band 35 on the outer periphery of a small-diameter portion 32. Since water is structurally sealed with the rubber packing 4, the structure is easily constructible and superior in the cut-off properties. Additionally, since a hole is not drilled in the side wall 11 of the manhole 1 and an anchor bolt etc. are not driven into it, the strength of the manhole 1 is not decreased. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connection structure between a manhole and a sewer main.

A technique using a rubber joint provided with an annular convex shape on the outer periphery for connection between a sewer main and a sewage tank is known (see Patent Document 1).
Further, as shown in FIG. 10, a communication hole is formed in the flange 106 (entire circumference) of the rigid tube 105 to which the anchor bolt 103 is driven from the shaft 102 into the side wall 101 of the manhole 100 and the flexible cylindrical body 104 is attached. A connection structure C between a sewer main and a manhole in which a nut 108 is screwed and fixed to an anchor bolt 103 protruding from 107 is also known.
JP 2002-54220 A

The said patent document 1 has the subject that the connection between a sewer main and a sewage trough by a rubber joint takes time.
Moreover, the connection structure C of a sewer main and a manhole has the following subject.
Since it is necessary to drive the anchor bolt 103 into the side wall 101 and screw the nut 108 into the bolt, it takes time and effort.
By driving the anchor bolt 103, the strength of the manhole 100 is lowered.
When two or more sewer mains are attached to the manhole 100 from different directions, the flanges 106 may interfere with each other and only one sewer main may be attached.
The all-around flange is expensive.

  An object of the present invention is to provide a connection structure between a manhole and a sewer main that is easy to construct and excellent in water-stopping properties and does not cause a decrease in manhole strength.

(About claim 1)
The connection structure between the manhole and the sewer main of claim 1 has a circular cross-section in which the end of the main pipe is fitted into a circular mounting hole provided in the side wall of the manhole installed in the shaft while there is play. The sewer main pipe is connected using a flexible joint including a rigid circular pipe, a flexible cylindrical body, and an elastic packing.

The rigid joint of the flexible joint has a pair of packing stoppers around the outer periphery of the cylindrical part that is longer than the side wall, and an elastic packing is inserted between them. Provided.
The flexible cylindrical body of the flexible joint includes a large-diameter portion that externally fits the outer periphery of the cylindrical portion protruding outward from the manhole, a small-diameter portion that externally fits the outer periphery of the sewer main, and a small-diameter portion and a large-diameter portion. And a fastener is attached to the outer periphery of the large diameter portion and the outer periphery of the small diameter portion.

Construction is performed as follows.
The rigid circular tube in which the elastic packing is inserted between the packing stoppers is press-fitted into the mounting hole from the inside of the manhole so that the locking portion comes into contact with the inner wall of the manhole. In addition, if a sealing material is filled into the gap between the inner wall of the mounting hole and the outer peripheral surface of the rigid tube from the outside of the manhole, the water stoppage is further improved.
The large-diameter portion of the flexible cylindrical body is fitted outside the manhole to the outer periphery of the rigid circular tube protruding outside the manhole.
The sewer main is propelled in the flexible joint to the position where the tip faces the inner wall of the manhole, and the clamp on the outer periphery of the small diameter portion is tightened in the shaft to fix the sewer main to the flexible cylindrical body.

Since the connection structure between the manhole and the sewer main of claim 1 is a structure in which water is stopped by an elastic packing inserted between a pair of packing stoppers, construction is easy and water-stopping is excellent. In addition, since no holes or anchor bolts are driven into the side wall of the manhole, the manhole strength is not reduced.
Note that when the rigid circular tube is press-fitted into the mounting hole, the locking portion only needs to abut on the inner wall of the manhole, and the rear end of the rigid circular tube does not need to be flanged.

(About claim 2)
If the curvature of the rear end of the circular tube including the locking portion of the rigid circular tube is made the same as the curvature of the inner wall of the manhole, the rear end portion of the rigid circular tube does not protrude from the inner wall of the manhole (the contact with the inner wall of the manhole). Therefore, it will not interfere with maintenance work in the manhole after the completion of construction.
If the circumferential curvature of the pair of packing stoppers is the same as the curvature of the inner wall of the mounting hole, the installed curvature of the elastic packing inserted between the packing stoppers will be the same as the curvature of the inner wall of the mounting hole, and the water sealing ability by the elastic packing Is greatly improved.
Since the elastic packing does not protrude from the inner wall of the mounting hole, water can be stopped even with manholes of any curvature and rectangular manholes.

(Claim 3)
The rigid circular tube in which the elastic packing is inserted between the packing stoppers is press-fitted into the mounting hole from the inside of the manhole until the locking portion comes into contact with the inner wall of the manhole (rigid circular tube press-fitting process). When press-fitting, the rib crest of the elastic packing is pressed against the inner wall of the mounting hole and is crushed, so that high water-stopping property is obtained. If the sealing material is filled into the gap between the inner wall of the mounting hole and the outer peripheral surface of the rigid circular tube from the outside of the manhole after the rigid circular tube is press-fitted, the water stoppage is further improved. The axial length of the rigid circular tube is set so that the front end of the circular tube protrudes from the mounting hole to the outside of the manhole when press-fitting until the locking portion comes into contact with the inner wall of the manhole.

A rigid circular tube having a large-diameter portion, a small-diameter portion, and a large-diameter portion, and a large-diameter portion of a flexible cylindrical body with a fastener attached to the outer periphery of the large-diameter portion and the outer periphery of the small-diameter portion Fit on the outer periphery of the front end outside the manhole (flexible cylindrical body fitting step).
Push the inside of the flexible cylinder to the position where the end of the sewer main unit faces the inner wall of the manhole, tighten the clamp on the outer periphery of the small diameter part outside the manhole, and fix the sewer main unit to the flexible joint (fixing the sewer main unit) Process).

  As the work to be performed at the construction site, the inside of the flexible joint is propelled to the position where the end of the sewer main faces the inner wall of the manhole, the fastener on the outer periphery of the small diameter portion is tightened outside the manhole, and the sewer main is turned into the flexible joint. Fix it. All other work is performed at a workplace (such as a manufacturing factory) other than the construction site.

Since the structure is such that the water is stopped by pressing and crushing the rib crests of the elastic packing inserted between the packing stoppers against the inner wall of the mounting hole, the construction is easy and the water stop is excellent.
Since it is not necessary to make a hole or drive an anchor bolt or the like in the side wall of the manhole, the strength of the manhole is not reduced. Note that it is only necessary to press-fit the rigid tube from the manhole into the mounting hole and bring the locking portion into contact with the inner wall of the manhole. Therefore, the rear end of the rigid tube does not need to be flanged.

(About claim 4)
The connection structure between the manhole and the sewer main of claim 4 has a circular cross-section in which the end of the main pipe is fitted with play in a circular mounting hole provided in the side wall of the manhole installed in the shaft. The sewer main pipe is connected using a flexible joint including a rigid circular pipe, a flexible cylindrical body, and an elastic packing.

The rigid joint rigid tube has a pair of packing stoppers around the outer circumference of the cylindrical part that is longer than the side wall, with elastic packing inserted between them, and is fixed coaxially in the mounting hole by multiple fixtures. Is done.
The flexible cylindrical body of the flexible joint includes a large-diameter portion that externally fits the outer periphery of the cylindrical portion protruding outward from the manhole, a small-diameter portion that externally fits the outer periphery of the sewer main, and a small-diameter portion and a large-diameter portion. And a fastener is attached to the outer periphery of the large diameter portion and the outer periphery of the small diameter portion.

Construction is performed as follows.
The rigid circular tube in which the elastic packing is inserted between the packing stoppers is press-fitted into the mounting hole from the inside of the manhole so that the locking portion comes into contact with the inner wall of the manhole. In addition, if a sealing material is filled into the gap between the inner wall of the mounting hole and the outer peripheral surface of the rigid tube from the outside of the manhole, the water stoppage is further improved.
The rigid circular tube is coaxially fixed to the mounting hole by a plurality of fixtures.
The large-diameter portion of the flexible cylindrical body is fitted outside the manhole to the outer periphery of the rigid circular tube protruding outside the manhole. The fastener on the outer periphery of the large diameter portion is tightened to fix the large diameter portion of the flexible cylindrical body to the rigid circular tube. The sewer main pipe is propelled inside the flexible joint until the tip of the end faces the inner wall of the manhole, and the small diameter outer peripheral fastener is tightened outside the manhole to fix the sewer main pipe to the flexible cylindrical body.

The connection structure between the manhole and the sewer main of claim 4 is a structure in which water is stopped by an elastic packing inserted between a pair of packing stoppers, so that construction is easy and water-stopping is excellent. In addition, since no holes or anchor bolts are driven into the side wall of the manhole, the manhole strength is not reduced.
Since the rigid circular tube of the flexible joint is coaxially fixed in the mounting hole by a plurality of fixtures, the rigid circular tube rear end (locking portion) does not protrude into the manhole, and the rigid circular tube There is no need to provide a locking portion.

(Claim 5)
If the curvature of the rear end of the circular tube is made the same as the curvature of the inner wall of the manhole, the rear end of the rigid circular tube will not protrude from the inner wall of the manhole, so it will not interfere with the maintenance work performed in the manhole after the completion of construction. .
If the circumferential curvature of the pair of packing stoppers is the same as the curvature of the inner wall of the mounting hole, the installed curvature of the elastic packing inserted between the packing stoppers will be the same as the curvature of the inner wall of the mounting hole, and the water sealing ability by the elastic packing Is greatly improved.
Since the elastic packing does not protrude from the inner wall of the mounting hole, water can be stopped even with manholes of any curvature and rectangular manholes.

(About claim 6)
The manhole and the sewer main are connected by the following construction procedure.
Elastic packing is inserted between a pair of packing stoppers provided around the outer periphery of the rigid circular pipe at a work site (manufacturing factory, etc.) other than the construction site (packing charging process).
The rigid circular tube with elastic packing inserted between the packing stoppers is pressed into the mounting hole from the outside of the manhole to the position where the rear end of the circular tube faces the manhole inner wall (rigid circular tube press-fitting process). When press-fitting, the rib crest of the elastic packing is pressed against the inner wall of the mounting hole and is crushed, so that high water-stopping property is obtained. If the sealing material is filled into the gap between the inner wall of the mounting hole and the outer peripheral surface of the rigid circular tube from the outside of the manhole after the rigid circular tube is press-fitted, the water stoppage is further improved. The axial length of the rigid tube is set so that when the rigid tube is pressed into the mounting hole until the rear end of the tube faces the inner wall of the manhole, the front of the tube protrudes from the mounting hole to the outside of the manhole. Has been.

The rigid tube is coaxially fixed to the mounting hole by a plurality of fixtures attached to the rear end of the rigid tube (rigid tube fixing step).
A rigid circular tube having a large-diameter portion, a small-diameter portion, and a large-diameter portion, and a large-diameter portion of a flexible cylindrical body with a fastener attached to the outer periphery of the large-diameter portion and the outer periphery of the small-diameter portion It fits on the outer periphery of the rear end outside the manhole (flexible cylindrical body fitting step).
The inside of the flexible joint is propelled to the position where the end of the sewer main end faces the inner wall of the manhole, and the clamp on the outer periphery of the small diameter portion is tightened outside the manhole to fix the sewer main to the joint (sewer main fixing process) ).

The construction method of Claim 6 which connects a manhole and a sewer main in said procedure has the following advantages.
The inside of the flexible joint is propelled to a position where the tip of the end of the sewer main body faces the inner wall of the manhole, and a fastener on the outer periphery of the small diameter portion is tightened on the outer side of the manhole to fix the sewer main to the flexible joint. Other operations can be performed at the manufacturing plant.

Since the structure is such that the water is stopped by pressing and crushing the rib crests of the elastic packing inserted between the packing stoppers against the inner wall of the mounting hole, the construction is easy and the water stop is excellent.
Since it is not necessary to make a hole or drive an anchor bolt or the like in the side wall of the manhole, the strength of the manhole is not reduced.
The rigid tube is coaxially fitted into the mounting hole by a plurality of fixtures attached to the rear end of the rigid tube by pressing the rigid tube into the mounting hole from the outside of the manhole until the rear end of the tube faces the inner wall of the manhole. Therefore, it is not necessary to make the rear end of the rigid circular tube into a flange shape.

(About claim 7)
The manhole and the sewer main are connected by the following construction procedure.
Elastic packing is inserted between a pair of packing stoppers provided around the outer periphery of the rigid circular pipe at a work site (manufacturing factory, etc.) other than the construction site (packing charging process).
The rigid circular tube with elastic packing inserted between the packing stoppers is pressed into the mounting hole from the outside of the manhole to the position where the rear end of the circular tube faces the manhole inner wall (rigid circular tube press-fitting process). When press-fitting, the rib crest of the elastic packing is pressed against the inner wall of the mounting hole and is crushed, so that high water-stopping property is obtained. If the sealing material is filled into the gap between the inner wall of the mounting hole and the outer peripheral surface of the rigid circular tube from the outside of the manhole after the rigid circular tube is press-fitted, the water stoppage is further improved. The axial length of the rigid tube is set so that when the rigid tube is pressed into the mounting hole until the rear end of the tube faces the inner wall of the manhole, the front of the tube protrudes from the mounting hole to the outside of the manhole. Has been.

The rigid tube is coaxially fixed to the mounting hole by a plurality of fixtures attached to the rear end of the rigid tube (rigid tube fixing step).
A rigid circular tube having a large-diameter portion, a small-diameter portion, and a large-diameter portion, and a large-diameter portion of a flexible cylindrical body with a fastener attached to the outer periphery of the large-diameter portion and the outer periphery of the small-diameter portion It fits on the outer periphery of the rear end outside the manhole (flexible cylindrical body fitting step).
A fastener attached to the outer periphery of the large diameter portion is tightened outside the manhole to fix the flexible cylindrical body to the front end of the rigid circular tube (flexible cylindrical body fixing step).
The inside of the flexible joint is propelled to the position where the end of the sewer main end faces the inner wall of the manhole, and the fastener on the outer periphery of the small diameter portion is tightened outside the manhole to fix the sewer main to the flexible joint (sewer main Fixing process).

The construction method of Claim 7 which connects a manhole and a sewer main in the above procedure has the following advantages.
The inside of the flexible joint is propelled to a position where the tip of the end of the sewer main body faces the inner wall of the manhole, and a fastener on the outer periphery of the small diameter portion is tightened on the outer side of the manhole to fix the sewer main to the flexible joint. Other operations can be performed at the manufacturing plant.

Since the structure is such that the water is stopped by pressing and crushing the rib crests of the elastic packing inserted between the packing stoppers against the inner wall of the mounting hole, the construction is easy and the water stop is excellent.
Since it is not necessary to make a hole or drive an anchor bolt or the like in the side wall of the manhole, the strength of the manhole is not reduced.
The rigid tube is coaxially fitted into the mounting hole by a plurality of fixtures attached to the rear end of the rigid tube by pressing the rigid tube into the mounting hole from the outside of the manhole until the rear end of the tube faces the inner wall of the manhole. Therefore, it is not necessary to make the rear end of the rigid circular tube into a flange shape.

The connection structure between the manhole and the sewer main is provided with a flexible joint including a rigid circular tube, a flexible cylindrical body, and an elastic packing into a circular mounting hole provided on the side wall of the manhole installed in the shaft. Used to connect a sewer main with a circular cross section.
The rigid circular tube of the flexible joint is provided with an elastic packing between packing stoppers, and a locking portion is provided at the rear end of the circular tube. Moreover, the flexible cylindrical body of the flexible joint has a large-diameter portion that externally fits the outer periphery of the cylindrical portion protruding to the outside of the manhole, and a small-diameter portion that externally fits the outer periphery of the sewer main.

Construction is performed as follows.
The rigid circular tube in which the elastic packing is inserted is press-fitted into the mounting hole from the inside of the manhole so that the locking portion comes into contact with the inner wall of the manhole. In order to improve water stop, after the rigid tube is press-fitted, a sealing material is filled into the gap between the inner wall of the mounting hole and the outer surface of the rigid tube from the outside of the manhole.
The large-diameter portion of the flexible cylindrical body is fitted outside the manhole to the outer periphery of the rigid circular tube protruding outside the manhole.
The inside of the flexible joint is propelled to the position where the end of the sewer main body faces the inner wall of the manhole, and the clamp on the outer periphery of the small diameter portion is tightened on the outer side of the manhole to fix the sewer main pipe to the flexible joint.

  Since the connection structure between the manhole and the sewer main is water-stopped by the inserted elastic packing, construction is easy and water-stopping is excellent. In addition, since no holes or anchor bolts are driven into the side wall of the manhole, the manhole strength is not reduced.

A first embodiment (corresponding to claims 1, 2, and 3) of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the connection structure A between the manhole and the sewer main is connected to the mounting hole 12 provided in the side wall 11 of the manhole 1 installed in the vertical shaft 10 with a steel pipe 2 (rigid circular pipe) and a rubber cylinder. The sewer main pipe 5 is connected using a flexible joint j1 having a body 3 (flexible cylindrical body) and a rubber packing 4 (elastic packing).

  The manhole 1 (made of concrete) is a connection type, is formed by stacking a plurality of cylindrical bodies in the vertical direction using a connection member and a seal member, and is erected in the shaft 10. A mounting hole 12 having a circular cross section is formed in the side wall 11 of the manhole 1.

The steel pipe 2 (made of steel) has packing stoppers 22 and 23 integrally provided around the outer periphery of the cylindrical portion 21 whose axial dimension is longer than the wall thickness of the side wall 11, and contacts the inner wall 13 of the manhole. Locking portions 24 for contact are provided at the rear end of the circular pipe at two locations (upper and lower).
The curvature of the rear end of the circular pipe including the locking portion 24 of the steel pipe 2 is set to be the same as the curvature of the manhole inner wall 13, and the circumferential curvature of the packing stoppers 22 and 23 is set to be the same as the curvature of the inner wall of the mounting hole 12. Has been.

  The rubber cylinder 3 includes a large-diameter portion 31 that externally fits the outer periphery of the cylindrical portion 21 of the steel pipe 2 protruding from the mounting hole 12 to the outside of the manhole 1, and a sewer main pipe 5 (made of fume pipe) having a circular cross section. A small-diameter portion 32 that fits around the outer periphery, and a large-diameter portion 33 positioned between the small-diameter portion 32 and the large-diameter portion 31, and stainless bands 34, 35 ( Fasteners) are attached.

The rubber packing 4 (elastic packing) is inserted between packing stoppers 22 and 23 provided around the outer periphery of the cylindrical portion 21 of the steel pipe 2.
A sealing material 14 is filled from the outside of the manhole 1 into the gap s1 between the inner wall of the mounting hole 12 and the outer peripheral surface of the cylindrical portion 21 of the steel pipe 2.

Construction of the connection structure A between the manhole and the sewer main is performed as follows.
(1) At a manhole manufacturing factory, the rubber packing 4 is inserted between packing stoppers 22 and 23 provided around the outer periphery of the cylindrical portion 21 of the steel pipe 2.

(2) As shown in FIGS. 3 and 4, the steel pipe 2 is press-fitted into the mounting hole 12 from the inside of the manhole 1 with a hydraulic jack 15 or the like so that the locking portion 24 contacts the manhole inner wall 13. In addition, since the steel pipe 2 has the axial dimension of the pipe longer than the thickness of the side wall 11, the cylindrical portion front side 25 protrudes from the mounting hole 12 to the outside of the manhole 1. In addition, in order to improve a water stop, the sealing material 14 is filled into the clearance gap between the inner wall of the attachment hole 12, and the outer peripheral surface of the steel pipe 2 from the outer side of the manhole 1. FIG.

(3) The large diameter portion 31 of the rubber cylindrical body 3 is fitted from the outside of the manhole 1 to the outer periphery of the cylindrical portion front side 25 of the steel pipe 2 protruding to the outside of the manhole 1 (see FIGS. 5 and 6). Before fitting, stainless steel bands 34 and 35 (fasteners) are attached in advance to the outer periphery of the large-diameter portion 31 and the outer periphery of the small-diameter portion 32 (see FIG. 5).

(4) The sewer main pipe 5 is propelled in the flexible joint j1 until the tip 52 of the end portion 51 faces the manhole inner wall 13 (see FIG. 7). And the stainless steel band 35 of the outer periphery of the small diameter part 32 is clamp | tightened on the outer side of the manhole 1, and the sewer main pipe 5 is fixed to the rubber cylindrical body 3 (refer FIG. 1).

The connection structure A between the manhole and the sewer main of this embodiment has the following advantages.
Since the connection structure A between the manhole and the sewer main is a structure in which the ground water is stopped by the rubber packing 4 inserted between the packing stoppers 22 and 23, the construction is easy and the water blocking is excellent. Further, since the holes other than the attachment holes 12 or anchor bolts are not driven into the side wall 11 of the manhole 1, the strength of the manhole 1 is not reduced.
In addition, since the latching | locking part 24 should just contact | abut the manhole inner wall 13 when pressing the steel pipe 2 in the attachment hole 12, it is not necessary to make the rear end of the steel pipe 2 into a flange shape.
The inside of the flexible joint j1 is propelled to a position where the end of the sewer main pipe 5 faces the inner wall of the manhole, and the stainless steel band 35 on the outer periphery of the small diameter section 32 is tightened outside the manhole 1 to flex the sewer main pipe 5 Fix to the joint j1. Other operations can be performed at the manufacturing plant.

  Since the curvature of the rear end of the circular pipe including the locking portion 24 of the steel pipe 2 is the same as the curvature of the inner wall 13 of the manhole, the rear end portion of the circular pipe of the steel pipe 2 does not protrude into the manhole (manhole Therefore, it does not interfere with the maintenance work performed in the manhole 1 after the completion of the construction.

  Further, since the circumferential curvature of the packing stoppers 22 and 23 is the same as the curvature of the inner wall of the mounting hole 12, the arrangement curvature of the rubber packing 4 inserted between the packing stoppers 22 and 23 is also the curvature of the inner wall of the mounting hole 12. The water-stopping ability of the rubber packing 4 is high.

  When the steel pipe 2 is press-fitted into the mounting hole 12, the rib crest of the rubber packing 4 inserted between the packing stoppers 22 and 23 is pressed by the inner wall of the mounting hole 12 and crushed to stop water, Construction is easy and water-stopping is excellent. Further, since the sealing material 14 is filled from the outside of the manhole 1 into the gap between the inner wall of the mounting hole 12 and the outer peripheral surface of the steel pipe 2, the water stoppage is further improved.

  A second embodiment (corresponding to claims 4, 5 and 6) of the present invention will be described with reference to FIGS. As shown in FIG. 8, the connection structure B between the manhole and the sewer main is connected to the mounting hole 12 provided in the side wall 11 of the manhole 1 installed in the shaft 10 with a steel pipe 6 (rigid circular pipe) and a rubber cylinder. The sewer main pipe 5 is connected using a flexible joint j2 having a body 3 (flexible cylindrical body) and a rubber packing 7 (elastic packing).

  The steel pipe 6 made of steel has a cylindrical shape longer than the thickness of the side wall 11, packing stoppers 61 and 62 are integrally provided around the outer periphery, and the steel pipe 6 is coaxially inserted into the mounting hole 12. A plurality of sets of bolts 63 and nuts 64 (fixing tools) for fixing are attached. The curvature of the rear end of the circular pipe of the steel pipe 6 is set to be the same as the curvature of the manhole inner wall 13, and the circumferential curvature of the packing stoppers 61 and 62 is set to be the same as the curvature of the inner wall of the mounting hole 12.

  The rubber packing 7 (elastic packing) is inserted between packing stoppers 61 and 62 provided around the outer periphery of the steel pipe 6. A sealing material 14 is filled from the outside of the manhole 1 into a gap s <b> 2 between the inner wall of the mounting hole 12 and the outer peripheral surface of the steel pipe 6.

Construction of the connection structure B between the manhole and the sewer main is performed as follows.
(1) At a manhole manufacturing plant, the rubber packing 7 is inserted between packing stoppers 61 and 62 provided around the outer periphery of the steel pipe 6.

(2) The steel pipe 6 is press-fitted into the mounting hole 12 from the outside of the manhole 1 (see FIG. 9). The steel pipe 6 has a pipe axial dimension longer than the thickness of the side wall 11, so that the pipe front end portion 65 projects from the mounting hole 12 to the outside of the manhole 1. In addition, in order to improve a water stop, the sealing material 14 is filled into the clearance gap between the inner wall of the attachment hole 12, and the outer peripheral surface of the steel pipe 6 from the outer side of the manhole 1. FIG.

(3) The steel pipe 6 is coaxially fixed to the mounting hole 12 by a plurality of bolts 63 and nuts 64. (4) The large diameter portion 31 of the rubber cylindrical body 3 is fitted from the outside of the manhole 1 into the outer periphery of the pipe front end portion 65 of the steel pipe 6 protruding to the outside of the manhole 1. Before fitting, stainless steel bands 34 and 35 (fasteners) are attached in advance to the outer periphery of the large-diameter portion 31 and the outer periphery of the small-diameter portion 32.

(5) The sewer main pipe 5 is propelled in the flexible joint j2 until the tip 52 of the end 51 faces the manhole inner wall 13. And the stainless steel band 35 of the outer periphery of the small diameter part 32 is clamp | tightened on the outer side of the manhole 1, and the sewer main pipe 5 is fixed to the rubber cylindrical body 3 (refer FIG. 8).

The connection structure B between the manhole and the sewer main of this embodiment has the following advantages.
Since the connection structure B between the manhole and the sewer main is a structure in which the groundwater is stopped by the rubber packing 7 inserted between the packing stoppers 22 and 23, the construction is easy and the water blocking is excellent. Further, since the holes other than the attachment holes 12 or anchor bolts are not driven into the side wall 11 of the manhole 1, the strength of the manhole 1 is not reduced.

When the steel pipe 6 is press-fitted into the mounting hole 12, the steel pipe 6 may be coaxially fixed to the mounting hole 12 with a plurality of bolts 63 and nuts 64. There is no need to form a flange.
The inside of the flexible joint j2 is propelled to a position where the tip of the end of the sewer main 5 faces the inner wall of the manhole, the outer stainless steel band 35 of the small diameter portion 32 is tightened outside the manhole 1, and the sewer main 5 is flexibly Fix to the joint j2. Other operations can be performed at the manufacturing plant.

  Since the curvature of the rear end of the circular pipe of the steel pipe 6 is made the same as the curvature of the inner wall 13 of the manhole, the rear end of the circular pipe of the steel pipe 6 does not protrude into the manhole 1, so It does not interfere with the maintenance work performed in 1.

  Further, since the circumferential curvature of the packing stoppers 61 and 62 is the same as the curvature of the inner wall of the mounting hole 12, the arrangement curvature of the rubber packing 7 inserted between the packing stoppers 61 and 62 is also the curvature of the inner wall of the mounting hole 12. Since the rubber packing 7 does not protrude, the water can be stopped.

  When the steel pipe 6 is press-fitted into the mounting hole 12, the rib crest of the rubber packing 7 inserted between the packing stoppers 61 and 62 is pressed by the inner wall of the mounting hole 12 to be crushed and stopped. Construction is easy and water-stopping is excellent. Further, since the sealing material 14 is filled from the inside of the manhole 1 into the gap s <b> 2 between the inner wall of the mounting hole 12 and the outer peripheral surface of the steel pipe 6, the water stoppage is further improved.

The present invention includes the following embodiments in addition to the above embodiments.
a. The rubber packings 4 and 7 (elastic packing) may be water expansion rubber.
b. Since the shape of the rubber packings 4 and 7 can be matched to the size and shape of the manhole, it can be applied to square manholes, manholes with a large curvature radius R on the manhole sidewall, and manholes with a small curvature radius R on the manhole sidewall. it can.
c. The number of locking portions 24 and the number of bolts 63 and nuts 64 are arbitrary. The packing stoppers 22 and 62 may not be provided.
d. The steel pipe 6 may be press-fitted into the mounting hole 12 from the manhole 1.
e. A locking part and a fixture may be provided side by side.
f. The identification of the curvature radius may not be accurate.

It is sectional drawing of the perpendicular direction of the connection structure of the manhole which concerns on Example 1, and a sewer main. It is sectional drawing of the horizontal direction of the connection structure of the manhole which concerns on Example 1, and a sewer main. In the connection structure of the manhole and the sewer main which concern on Example 1, it is sectional drawing which shows the place which inserts the steel pipe | tube which inserted elastic packing between the packing stoppers into the attachment hole from the manhole side. In the connection structure of the manhole and sewer main which concern on Example 1, it is sectional drawing which shows the place which press-fitted the steel pipe which inserted the elastic packing between the packing stoppers to the attachment hole. In the connection structure of the manhole and the sewer main which concerns on Example 1, (a) is sectional drawing of the perpendicular direction which shows the place which fits the large diameter part of a rubber cylinder to the outer periphery of the cylindrical part front side of a steel pipe. (B) is sectional drawing of the horizontal direction which shows the place which fits the large diameter part of a rubber cylindrical body in the outer periphery of the cylindrical part front side of steel pipes. In the connection structure between the manhole and the sewer main according to the first embodiment, the large diameter portion of the rubber cylindrical body fitted to the outer periphery of the front side of the cylindrical portion of the steel pipe is fixed to the front side of the steel pipe by tightening the stainless steel band. It is sectional drawing of the perpendicular direction which shows a place to do. In the connection structure of the manhole which concerns on Example 1, and the sewer main, it is sectional drawing of the perpendicular direction which shows the place which pushes a sewer main in a rubber cylinder to the position where the front-end | tip of an edge part faces a manhole inner wall. In the connection structure between the manhole and the sewer main according to the second embodiment, the large diameter portion of the rubber cylindrical body fitted to the outer periphery of the front side of the cylindrical portion of the steel pipe is fixed to the front side of the steel pipe by tightening the stainless steel band. It is sectional drawing of the perpendicular direction which shows a place to do. In the connection structure of the manhole which concerns on Example 2, and the sewer main, it is sectional drawing which shows the place which inserts the steel pipe | tube which inserted elastic packing between the packing stoppers into the attachment hole from the shaft side. It is sectional drawing of the perpendicular direction of the connection structure of the manhole which concerns on a prior art, and a sewer main.

Explanation of symbols

1 Manhole 2, 6 Steel pipe (Rigid circular pipe)
3 Rubber cylinder (flexible cylinder)
4, 7 Rubber packing (elastic packing)
5 Sewer main 10 Vertical shaft 11 Side wall 12 Mounting hole 21 Cylindrical part 22, 23 Packing stopper 24 Locking part 25 Cylindrical part front side 31 Large diameter part 32 Small diameter part 33 Wide diameter part 34, 35 Stainless steel band (clamp)
63 bolts (fixtures)
64 Nut (fixing tool)
A and B Manhole and sewer main connection structure j1, j2 Flexible joint

Claims (7)

Manholes and sewers that connect a sewer main with a circular cross-section with a main pipe end fitted into a mounting hole with a circular cross-section provided on the side wall of a manhole installed in a vertical shaft using a flexible joint A connection structure with the main,
The flexible joint is
A pair of packing stoppers are provided around the outer periphery of the cylindrical portion longer than the side wall, and a rigid circular tube provided with a locking portion that contacts the inner wall of the manhole at the rear end of the circular tube;
A large-diameter portion that externally fits the outer periphery of the cylindrical portion that protrudes to the outside of the manhole, a small-diameter portion that externally fits the outer periphery of the sewer main, and a large-diameter portion positioned between the small-diameter portion and the large-diameter portion. A flexible cylindrical body having a portion and a fastener attached to the outer periphery of the large-diameter portion and the outer periphery of the small-diameter portion;
A connecting structure between a manhole and a sewer main, characterized by comprising an elastic packing inserted between packing stoppers.   The curvature of the rear end of the circular pipe including the locking portion of the rigid circular pipe is the same as the curvature of the inner wall of the manhole, and the circumferential curvature of the pair of packing stoppers is the same as the curvature of the inner wall of the mounting hole. A connection structure between the manhole according to claim 1 and a sewer main. A sewer main pipe with a circular cross section is connected to a mounting hole with a circular cross section provided on a side wall of a manhole installed in a vertical shaft using a flexible joint including a rigid circular pipe, a flexible cylindrical body, and an elastic packing. Connecting the manhole and sewer main,
A packing loading step of loading the elastic packing between a pair of packing stoppers provided around the pipe outer periphery of the rigid circular pipe provided with a locking portion at the rear end of the circular pipe;
A rigid circular tube press-fitting step of press-fitting the rigid circular tube into the mounting hole from the inside of the manhole so that the locking portion contacts the inner wall of the manhole;
The large-diameter portion, the small-diameter portion, and the wide-diameter portion, and the large-diameter portion of the flexible cylindrical body that has a fastener attached to the outer periphery of the large-diameter portion and the outer periphery of the small-diameter portion protrudes outward from the manhole. A flexible cylindrical body fitting step for fitting the outer circumference of the rigid tube outside the manhole;
A manhole and a sewer main comprising the sewer main fixing step of propelling the inside of the flexible joint to a position where the end of the sewer main faces the inner wall of the manhole and tightening the fastener on the outer periphery of the small diameter portion outside the manhole. Connection method. Manholes and sewers that connect a sewer main with a circular cross-section with a main pipe end fitted into a mounting hole with a circular cross-section provided on the side wall of a manhole installed in a vertical shaft using a flexible joint A connection structure with the main,
The flexible joint is
A pair of packing stoppers are provided around the outer periphery of the cylindrical portion longer than the side wall, and a rigid circular tube fixed coaxially into the mounting hole by a plurality of fixtures;
A large-diameter portion that externally fits the outer periphery of the cylindrical portion that protrudes to the outside of the manhole, a small-diameter portion that externally fits the outer periphery of the sewer main, and a large-diameter portion positioned between the small-diameter portion and the large-diameter portion. A flexible cylindrical body having a portion and a fastener attached to the outer periphery of the large-diameter portion and the outer periphery of the small-diameter portion;
A connecting structure between a manhole and a sewer main, characterized by comprising an elastic packing inserted between packing stoppers. Make the curvature of the rear end of the tube the same as the curvature of the inner wall of the manhole,
The connection structure between the manhole and the sewer main according to claim 3, wherein the circumferential curvature of the pair of packing stoppers is the same as the curvature of the inner wall of the mounting hole. A sewer main pipe with a circular cross section is connected to a mounting hole with a circular cross section provided on a side wall of a manhole installed in a vertical shaft using a flexible joint including a rigid circular pipe, a flexible cylindrical body, and an elastic packing. Connecting the manhole and sewer main,
A packing loading step of loading an elastic packing between a pair of packing stoppers provided around the outer circumference of the rigid circular pipe;
A rigid pipe press-fitting step of press-fitting the rigid pipe into the mounting hole from the outside of the manhole until the rear end of the pipe faces the inner wall of the manhole;
A rigid tube fixing step of coaxially fixing the rigid tube to the mounting hole by a plurality of fixing devices attached to the rear end of the rigid tube;
The above-mentioned large-diameter portion of a flexible cylindrical body having a large-diameter portion, a small-diameter portion, and a large-diameter portion, and having a fastener attached to the outer periphery of the large-diameter portion and the outer periphery of the small-diameter portion. A flexible cylindrical body fitting step for fitting the outer circumference of the circular tube outside the manhole;
A manhole and a sewer main comprising the sewer main fixing step of propelling the inside of the flexible joint to a position where the end of the sewer main faces the inner wall of the manhole, and tightening the fastener on the outer periphery of the small diameter portion in the shaft. Connection method. A sewer main pipe with a circular cross section is connected to a mounting hole with a circular cross section provided on a side wall of a manhole installed in a vertical shaft using a flexible joint including a rigid circular pipe, a flexible cylindrical body, and an elastic packing. Connecting the manhole and sewer main,
A packing loading step of loading an elastic packing between a pair of packing stoppers provided around the outer circumference of the rigid circular pipe;
A rigid tube press-fitting step of press-fitting the rigid tube into the mounting hole from the outside of the manhole until the rear end of the tube faces the inner wall of the manhole;
A rigid tube fixing step of coaxially fixing the rigid tube to the mounting hole by a plurality of fixing devices attached to the rear end of the rigid tube;
The above-mentioned large-diameter portion of a flexible cylindrical body having a large-diameter portion, a small-diameter portion, and a large-diameter portion, and having a fastener attached to the outer periphery of the large-diameter portion and the outer periphery of the small-diameter portion. A flexible cylindrical body fitting step for fitting the outer circumference of the circular tube outside the manhole;
A flexible cylinder fixing step of fixing the flexible cylinder to the front end of the rigid circular tube by tightening the fastener attached to the outer periphery of the large-diameter portion outside the manhole;
A manhole and a sewer main comprising the sewer main fixing step of propelling the inside of the flexible joint to a position where the end of the sewer main faces the inner wall of the manhole, and tightening the fastener on the outer periphery of the small diameter portion in the shaft. Connection method.

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