JP3958729B2 - Human hole flexible joint - Google Patents

Description

  The present invention relates to a human hole flexible joint that connects a human hole and a pipe line connected to the human hole while allowing relative displacement.

  A configuration disclosed in Patent Document 1 is known as a configuration that allows relative displacement between a human hole and a pipe line connected to the human hole due to uneven settlement of the ground while maintaining watertightness.

  As shown in the conceptual diagram of FIG. 3, the end of the pipe 52 is loosely fitted in the through-hole 51A formed in the side wall of the human hole 51, and the outer circumference of the pipe 52 and the inner circumference of the through-hole 51A. The water stop flexible member 53 is interposed between the two.

  The water stop flexible member 53 has a substantially cone shape, and a large-diameter base end portion 53A is fitted and fixed to the inner peripheral surface of the through hole 51A and extends from the base end portion 53A to the pipe line side. The other end 53B having a small diameter is fitted and fixed to the outer periphery of the pipe line 52, thereby connecting the human hole 51 and the pipe line 52 in a watertight manner, and elastically deforming the human hole 51 and the pipe line 52 relative to each other. The displacement can be allowed.

Further, there is a similar configuration disclosed in Patent Document 2.
Japanese Patent Laid-Open No. 11-21930 Japanese Patent No. 2571380

  However, in the conventional configuration as described above, the fixing portion of the water-stopping flexible member 53 on the side of the pipe 52 is outside the human hole 51. Therefore, particularly when a human hole is added to the existing pipe. There was a problem that the construction was extremely troublesome. In addition, maintenance after the start of service is also difficult.

  This invention is made | formed in view of the said problem, Comprising: It aims at providing the human-hole flexible joint which can perform construction and a maintenance easily.

  The human-hole flexible joint of the present invention that achieves the above object is characterized in that, in the connecting portion between the human hole and the pipe line, the pipe line is loosely fitted in an insertion hole formed in a side wall of the human hole, and the tip part is the person. An annular flexible water blocking member is disposed in a watertight manner between the large-diameter mounting plate mounted at the tip of the conduit and the inner wall surface of the human hole, located inside the hole. In addition, a joint material is interposed between the outer periphery of the conduit and the insertion hole.

  In this configuration, the flexible water blocking member keeps the water tightness of the connection portion and allows relative displacement between the human hole and the pipe line by its elastic deformation. All construction and maintenance is possible from inside the manhole.

  Moreover, in addition to the said structure, between the outer periphery of the said flexible water-stop member and the said pipe line, it is characterized by being filled with urethane foam.

  In this configuration, the foamed urethane resists the external pressure acting on the flexible water-stopping member, suppresses the extension of the flexible water-stopping member, and also has a water-stopping action.

  According to the human hole flexible joint of the present invention, the pipe line is loosely fitted into the insertion hole formed in the side wall of the human hole, the tip is located inside the human hole, and the large pipe is attached to the tip of the pipe. An annular flexible water-stopping member is disposed in a watertight manner between the diameter mounting plate and the inner wall surface of the human hole, and a joint material is interposed between the outer periphery of the conduit and the insertion hole. By being mounted and configured, construction and maintenance such as mounting of a flexible water-stopping member can be easily performed from the inside of the human hole.

  Further, since the urethane foam is filled between the flexible water-stopping member and the outer periphery of the pipe line, the foamed urethane resists the external pressure acting on the flexible water-stopping member. It is possible to suppress the elongation of the water member and increase the water stop action, and to allow relative displacement between the manhole and the pipe line while maintaining water tightness even in an environment where high water pressure acts.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a connecting portion between a manhole 10 as a human hole to which a configuration example of a human hole flexible joint according to the present invention and a pipe line 20 (upstream pipe line 21 and downstream pipe line 22). ) Is a cross-sectional view in a horizontal plane passing through the center of the pipe line 20, and (B) is a cross-sectional view in a vertical plane passing through the center of the pipe line 20. This configuration example is an example in which the manhole 10 is additionally constructed in an existing shield pipe line (pipe line 20) constructed by assembling segments into a cylindrical shape.

  An upstream pipe line 21 and a downstream pipe line 22 are connected to the manhole 10 via a joint 30 which is a configuration example of the human-hole flexible joint according to the present invention, with the central axes thereof aligned. ing. The joint 30 of the upstream side pipeline 21 and the downstream side pipeline 22 is the same, and will be described as the pipeline 20 hereinafter.

  As shown in FIG. 2, which is an enlarged view of the portion X in FIG. 1B, the joint 30 has a pipe 20 penetrating through the side wall 11 of the manhole 10 and an inner surface of the side wall 11. , And are connected by a water stop rubber 31 as a flexible water stop member having flexibility.

  In the manhole 10, the insertion hole 12 of the pipe line 20 is formed in the side wall 11, and concrete is applied to the periphery of the opening to the inside of the side wall 11, so that the flat mounting is perpendicular to the central axis of the pipe line 20. A surface 13 is formed.

  The pipe line 20 is loosely fitted in the insertion hole 12, and the tip thereof is disposed so as to protrude from the mounting surface 13 inside the side wall 11 by a predetermined amount. The position of the front end of the pipe line 20 is set so that the front end has a predetermined distance from the mounting surface 13 of the side wall 11 by connecting the adjustment segment 20A made of steel plate to the existing segment constituting the pipe line 20. The In addition, the imaginary line in FIG. 1 shows the existing segment removed when constructing the manhole 10.

  The insertion hole 12 of the manhole 10 is set to a diameter having a predetermined margin with respect to the outer diameter of the pipe line 20 (a predetermined amount larger than the outer diameter of the pipe line 20), and the outer periphery of the pipe line 20 and the insertion hole 12. A joint material 32 is interposed between the inner periphery of each of the members. In the figure, reference numeral 33 denotes a joint material filled in the adjustment segment 20A.

  A connection flange 34 as a mounting plate is fixed to the distal end of the pipe line 20 (the distal end of the adjustment segment 20 </ b> A), and one side edge of the water blocking rubber 31 is fixed to the connection flange 34.

  The connecting flange 34 has an annular shape whose inner diameter is equal to the inner diameter of the pipe line 20 (adjustment segment 20A) and whose outer diameter is larger than the outer diameter of the pipe line 20 by a predetermined amount. 20A) and integrated.

  The waterstop rubber 31 is provided with an attachment portion 31A bent to the outer peripheral side at both side edges with a width corresponding to the interval between the connecting flange 34 and the mounting surface 13 by an elastic material of a predetermined hardness such as rubber or synthetic resin, and in the width direction. A deformed bent portion 31B that is bent and protruded with a predetermined width is formed on the outside at the center. Then, one mounting portion 31A is watertightly fastened to the connecting flange 34 via the pressing fitting 41 by the mounting bolt 42, and the other mounting portion 31A is embedded in the mounting surface 13 of the side wall 11. The mounting hole 42 is screwed in a watertight manner via a pressing fitting 41, and the manhole 10 and the connecting flange 34 (that is, the pipe line 20) are connected while maintaining the watertightness inside and outside.

  The mounting nut 43 is welded and fixed to the anchor member 43 </ b> A, and is embedded in the concrete forming the mounting surface 13 with its outer surface coinciding with the mounting surface 13.

  A space is formed between the inner periphery of the water-stopping rubber 31 and the outer periphery of the adjustment segment 20 </ b> A with a predetermined gap, and the urethane foam 35 is filled in the space.

  A joint material 36 is disposed on the outer peripheral side of the water-stopping rubber 31, and a cover plate 37 is disposed on the outer peripheral side thereof, and is fixed by a metal fitting 38 having an L-shaped cross section.

  In the joint 30 configured as described above, the outer periphery of the pipe line 20 and the inner periphery of the insertion hole 12 are loosely fitted with a predetermined interval, and the pipe line 20 has a tip that is water-stopping inside the manhole 10. Since they are connected via the rubber 31, it is possible to allow relative displacement in the axial direction and the bending direction of the conduit 20 with respect to the manhole 10 while maintaining watertightness by elastic deformation of the water-stopping rubber 31 and the urethane foam 35. .

  That is, the relative displacement in the axial direction of the pipe line 20 with respect to the manhole 10 can be allowed by expansion and contraction in the axial direction of the water-stopping rubber 31, and the water-stopping rubber 31 is interposed between the pipe 20 and the insertion hole 12. Further, the elastic deformation of the joint material 32 can allow the relative displacement in the bending direction of the pipe line 20 with respect to the manhole 10.

  Moreover, since the construction of the joint 30 such as mounting of the water stop rubber 31 can be performed inside the manhole 10, the workability is extremely good.

  In each of the above configuration examples, the present invention has been described with respect to an example in which a human hole is additionally constructed in an existing shield pipe. However, the present invention is not limited to this, and is applied to an integral pipe or a simultaneous new human hole. Of course, it is also good.

  Further, the urethane foam 35 filled between the inner periphery of the water-stopping rubber 31 and the outer periphery of the adjustment segment 20A is not always necessary, and may be omitted when the external pressure is small.

It is sectional drawing of the connection part of the human hole and pipe line to which the example of 1 structure of the human hole flexible joint which concerns on this invention is applied. It is the X section enlarged view of Drawing 1 (B). It is a figure which shows notionally the connection part of the human hole and pipe line as a prior art example.

Explanation of symbols

10 Manhole
11 Side wall 12 Insertion hole 20 Pipe line 30 Joint 34 Connection flange (mounting plate)
31 Water stop rubber (flexible water stop member)
32 Joint material 35 Urethane foam

Claims (2)

At the connection between the human hole and the pipeline,
The pipe line is loosely fitted in an insertion hole formed in a side wall of the human hole, and a tip end portion is located inside the human hole, and is attached to the front end of the pipe line and is a predetermined amount larger than an outer diameter of the pipe line. An annular flexible water blocking member is disposed between the connecting flange having a diameter and the inner wall surface of the human hole in a watertight manner, and the joint is provided between the outer periphery of the pipe and the insertion hole. A human hole flexible joint, characterized in that a material is interposed. 2. The human-hole flexible joint according to claim 1, wherein urethane foam is filled between the flexible water-stopping member and the outer periphery of the pipe line.

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