JP3708539B1 - Manhole bottom block and manhole using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bottom block capable of reliably holding an external pipe and having a pipe connection structure with a wide movable range and reducing manufacturing cost and construction cost, and a manhole using the same.
A pipe joint portion 11 is constituted by a side wall of a bottom block 1 and has a through hole 12 penetrating the side wall from an outer surface to an inner surface. In the through-hole 12, the opening 121 on the outer peripheral surface side has a larger diameter than the opening 122 on the inner surface, and the inner peripheral surface is a tapered surface. The water-impervious member 13 is a tubular body having flexibility, and has openings 131 and 132 at both ends in the axial direction, and one end of the openings 131 and 132 is embedded in the side wall of the pipe joint portion 11. And rises from the outer surface 110.
The bottom block 1 described above is used in a manhole in combination with the straight wall block 2. The bottom block 1 has a straight wall block 2 stacked on top.
[Selection] Figure 5

Description

  The present invention relates to a manhole bottom block, and a sewage manhole and a rainwater manhole using the same.

  A plurality of manholes are embedded in public roads, and adjacent manholes are connected by external piping.

  A problem that must be solved in this type of manhole is to have a structure that can cope with an axial deviation that occurs during pipe connection work. That is, since the embedding work of individual manholes is usually performed prior to the pipe connection work between the manholes, at the time of pipe connection work, the shaft center of the through hole provided in the manhole pipe joint and the connection to this are connected. In many cases, the shaft misalignment with the axial center of the external pipe to be performed has hindered the efficiency of pipe connection work. In order to avoid such a connection failure due to the shaft misalignment, for example, as shown in Patent Documents 1 and 2, various pipe connection structures have been conventionally proposed.

  In the prior art described in Patent Document 1, the pipe joint portion provided in the manhole has a through hole whose inner periphery is a tapered surface, and a cylindrical water shielding member having flexibility on the outer periphery is a band. It is attached using. The external pipe passes through the water shielding member and is guided into the through hole. According to this configuration, the external pipe is guided to the inside of the through hole along the tapered surface and is held by the flexible water shielding member, so that it is possible to avoid a connection failure due to the shaft misalignment.

  However, according to Patent Document 1, it is a premise that the water shielding member is attached to the pipe joint part by covering one end of the water shielding member over the opening of the through hole and fixing it with a band. A pipe joint that protrudes greatly from the side wall must be formed. For this reason, the manufacturing efficiency is deteriorated and the weight is increased.

  Moreover, since a band is used for attachment of the water shielding member to the pipe joint portion, the number of parts increases accordingly. In addition, since the band mounting operation requires the skill of the operator, there is a risk of a watertight accident due to a tightening failure or forgetting to tighten.

  Furthermore, since the work for attaching the water shielding member and the pipe connecting work are usually performed inside a narrow installation hole, the work is difficult.

  According to Patent Document 2, as another prior art for avoiding a connection failure due to axial deviation, the manhole bottom block is provided with a through hole in the side wall, and a joint for pipe connection is provided in the inner periphery of the through hole. ing. The joint is composed of a rubber cylindrical portion, and rises from the inner periphery of the through hole to the outside of the through hole. The external pipe is internally fitted to the tip of the joint outside the through hole.

However, according to Patent Document 2, since the external pipe has a structure that is held only by the rubber joint, accidents of dropping off the external pipe due to earth pressure from the surroundings or vibration during an earthquake frequently occur. If one end of the external pipe is inserted to the inside of the through-hole, the external pipe cannot be shaken, so that it is not possible to cope with the axial deviation.
JP2002-266361 JP 2001-032308 A

  An object of the present invention is to provide a manhole bottom block capable of reliably holding external piping, and a manhole using the same.

  Another object of the present invention is to provide a manhole bottom block having a pipe connection structure with a wide movable range, and a manhole using the same.

  Yet another object of the present invention is to provide a manhole bottom block capable of reducing manufacturing costs and construction costs, and a manhole using the same.

  In order to solve the above-described problems, a manhole bottom block (hereinafter simply referred to as a bottom block) according to the present invention includes a pipe joint portion and a water shielding member. A pipe joint part is comprised by the side wall of a bottom block, and has the through-hole which penetrates the said side wall from an outer surface to an inner surface. In the through hole, the opening on the outer surface side has a larger hole diameter than the opening on the inner surface side, and the inner peripheral surface is a tapered surface. The water-impervious member is a flexible cylindrical body having openings at both ends in the axial direction, and one end of the opening is embedded in the side wall of the pipe joint portion, and from the outer surface of the side wall. Standing up.

  The bottom block described above is used for a manhole in combination with a manhole straight wall block (hereinafter simply referred to as a straight wall block). The bottom block has a straight wall block stacked on top.

  As described above, the bottom block has a pipe joint portion, and the pipe joint portion is constituted by the side wall of the bottom block and has a through hole that penetrates the side wall from the outer surface to the inner surface. By connecting the pipe to the pipe joint portion, sewage or the like can flow into the manhole through the through hole.

  The through hole has a larger opening diameter on the outer surface side than the opening on the inner surface side, and the inner peripheral surface is a tapered surface. Therefore, when connecting the external pipe to the pipe joint, the insertion end of the external pipe Can be guided to the through hole along the tapered surface. Therefore, even when the axial displacement between the pipe joint portion and the external pipe occurs, the external pipe can be guided and connected to the through hole.

  In addition, after the external pipe is connected to the pipe joint, its insertion end is placed inside the through-hole, so earth pressure from the surroundings applied to the external pipe and vibration during an earthquake are It is supported by the inner peripheral surface of. Therefore, according to the bottom block and the manhole using the same according to the present invention, it is possible to avoid an accidental drop of the external pipe due to earth pressure from the surroundings or vibration during an earthquake, and to securely hold the external pipe. it can.

  Furthermore, after the external pipe is connected to the pipe joint portion, the external pipe is held so as to freely swing within the range of the tapered surface. That is, since the bottom block according to the present invention and the manhole using the same have a pipe connection structure with a wide movable range, for example, the insertion end of the external pipe is connected to the inner peripheral surface of the through hole due to earth pressure or vibration. Even if it is swung, it can be held and the problem of falling off from the pipe joint can be avoided.

  The manhole includes a water shielding member. Since the water shielding member is a cylindrical body and has openings at both ends in the axial direction, when connecting the external pipe to the pipe joint, one end of the external pipe is connected to the inside of the water shielding member through the opening. Can be guided to.

  Since the one end of the opening part is embedded in the side wall of the pipe joint part, the band which was conventionally required becomes unnecessary for the water shielding member. Therefore, the manufacturing cost can be reduced by reducing the number of parts.

  In addition, since the band is unnecessary, the number of steps of attaching the water shielding member and pipe connecting work can be reduced accordingly. Therefore, the construction cost can be reduced.

  Further, since no band is required, the external pipe and the pipe joint can be easily and reliably connected regardless of the skill level of the worker. Therefore, cost reduction can be realized by increasing the efficiency of the work of attaching the water shielding member and the pipe connecting work.

  Since the one end of the opening of the water shielding member is embedded in the side wall of the pipe joint portion in advance, it is not necessary to perform the work of attaching the water shielding member and the pipe connection work inside the narrow installation hole. Therefore, cost reduction can be realized by making these operations more efficient.

  Since the one end of the opening of the water shielding member rises from the outer surface of the side wall of the pipe joint portion, a space can be secured around the through hole. This space becomes a deformation space for the flexible water shielding member to be deformed corresponding to the connection direction of the external pipe guided to the through hole. Therefore, the water-impervious member can follow and hold the direction of the external pipe with respect to the shaft misalignment problem occurring between the pipe joint portion and the external pipe.

  On the other hand, when an external pipe is connected to the through hole, the pipe joint portion has a taper surface on the inner peripheral surface of the through hole, and the external pipe can swing within a taper angle range. Here, since one end of the opening of the water shielding member rises from the outer surface of the side wall of the pipe joint portion, a space can be secured between the water shielding member and the external pipe connected to the through hole. This space is a moving space when the external piping swings within the range of the taper angle, and becomes a deformation space for the flexible water shielding member to deform following the movement of the external piping. . Therefore, when the external pipe connected to the through hole swings within the range of the taper angle, the water shielding member follows and keeps holding the external pipe without obstructing the movement of the external pipe. be able to.

  Other objects, configurations and advantages of the present invention will be described in more detail with reference to the accompanying drawings. The accompanying drawings are merely examples.

As described above, according to the present invention, the following effects can be obtained.
(1) A bottom block capable of reliably holding external piping and a manhole using the same can be provided.
(2) A bottom block having a pipe connection structure with a wide movable range, and a manhole using the same can be provided.
(3) It is possible to provide a bottom block capable of reducing manufacturing costs and construction costs, and a manhole using the same.

  1 is a plan view of a bottom block according to the present invention, FIG. 2 is an end view taken along line 2-2 of FIG. 1, FIG. 3 is a right side view of the straight wall block shown in FIG. FIG. 3 is a left side wall view of the straight wall block shown in FIG.

  The bottom block according to an embodiment of the present invention is used to configure a manhole installed on a public road or the like, or a small manhole, and can be used for both a sewage manhole and a rainwater manhole.

  With reference to FIGS. 1 to 4, the bottom block according to an embodiment of the present invention includes a gutter base portion 10, a pipe joint portion 11, and a water shielding member 13.

  The heel base portion 10 is a molded body mainly made of synthetic resin or concrete, and has a connection hole 101, an invert portion 102, and an internal space 103. The internal space 103 is surrounded by the side wall and the internal bottom surface of the heel base 10. The connection hole 101 is a through-hole penetrating the internal space 103 and is provided on the upper end surface of the saddle base portion 10, and the invert portion 102 is provided on the inner bottom surface of the saddle base portion 10.

  The pipe joint part 11 is preferably constituted by the side wall of the saddle base part 10, and the outer surface 110 of the side wall of the pipe joint part 11 projects from the saddle base part 10 in the axial direction indicated by the dotted line a1.

  Moreover, the pipe joint part 11 has the through-hole 12 which penetrates the side wall of the collar base part 10 from an outer surface to an inner surface. In the through hole 12, the opening 121 on the outer surface side has a larger diameter than the opening 122 on the inner surface side, and the inner peripheral surface is a tapered surface 123. A gap 125 is provided at a connection portion between the tapered surface 123 and the opening 122. The gap 125 can be used as a pipe stopper for fixing the insertion end of the external pipe when the external pipe is connected to the through hole 12.

  In the embodiment shown in FIGS. 1 to 4, the pipe joint portion 11 is provided at two locations, one being used as an outflow hole portion and the other being used as an inflow hole portion. Although the number of the pipe joint parts 11 used as the outflow hole part is one, the pipe joint part 11 used as the inflow hole part can be configured to include one or a plurality as necessary. The two pipe joint portions 11 are connected to each through hole 12 and the invert portion 102 in a water-permeable manner, and form a straight drainage channel having an inclined surface from the inflow hole portion to the outflow hole portion. are doing.

  The water shielding member 13 is a cylindrical body having flexibility and rubber elasticity. The water shielding member 13 is preferably made of synthetic resin such as polyethylene (PE), polypropylene (PP), vinyl chloride resin (PVC), or synthetic rubber such as styrene-butadiene rubber (SBR).

  The water-impervious member 13 has openings 131 and 132 at both ends in the axial direction a <b> 1, and one ends of the openings 131 and 132 are embedded in the side wall of the pipe joint portion 11 and rise from the outer surface 110. More specifically, in the illustrated embodiment, the water-impervious member 13 has a small-diameter opening 131 and a large-diameter opening 132, and a diameter-changing portion between the small-diameter opening 131 and the large-diameter opening 132. Have The water-impervious member 13 rises from the outer surface 110 so that the large-diameter opening 132 is embedded in the side wall of the pipe joint 11 and covers the opening 121 of the through hole 12.

  The bottom block described above is combined with a straight wall block or the like to form a manhole. Next, a manhole using a bottom block according to an embodiment of the present invention will be described. FIG. 5 is a front view showing a partially broken manhole according to the present invention. In FIG. 5, the same components as those shown in FIGS. 1 to 4 are denoted by the same reference numerals.

  Referring to FIG. 5, the manhole according to an embodiment of the present invention includes a bottom block 1, a straight wall block 2, and an external pipe 3. Although not shown in FIGS. 5 to 7, the manhole according to the embodiment of the present invention may include a slant wall block, a lid, an adjustment ring, and the like, similar to a normal manhole in the technical field. it can.

  The bottom block 1 is described with reference to FIGS. 1 to 4, and the bottom outer surface is stably placed on the foundation 4, and the straight wall block 2 is stacked on the upper end 15. . If it demonstrates in detail, the lower end part 25 of the straight wall block 2 will be joined to the upper end part 15 of the bottom block 1 in the fitting state, and the water shielding process is performed between the junction parts 5. FIG.

  In the bottom block 1 shown in FIG. 5, the external pipe 3 is stably connected to the through hole 12 of the pipe joint portion 11. More specifically, the external pipe 3 has an insertion end 31 guided inside the through hole 12 along the tapered surface 123 and is fixed by a gap 125 in the vicinity of the opening 122 (see FIG. 2). Yes. The angle between the taper surface 123 and the upper outer peripheral surface 32 or the lower outer peripheral surface 32 of the external pipe 3 is preferably set to about 5 degrees, respectively.

  In the water shielding member 13, the large-diameter opening 132 is embedded in the side wall of the pipe joint portion 11, rises from the outer surface 110, and the small-diameter opening 131 covers the outer peripheral surface 32 of the external piping 3. Crimped to A space 130 is formed between the water shielding member 13 and the external pipe 3 connected to the through hole 12.

  The bottom block 1, the external piping 3, and the connection structure will be further described with reference to FIGS. 6 and 7 are front views showing a part of the usage manner of the manhole shown in FIG. 6 and 7, the same reference numerals are given to the same components as those shown in FIGS. 1 to 5.

  FIG. 6 is an end view showing an embodiment in which the external pipe 3 is bent and connected downward, and FIG. 7 is an end view showing an embodiment in which the external pipe 3 is bent and connected upward. The external pipe 3 is in a state where the axis a2 of the external pipe 3 intersects the axis a1 of the through-hole 12 to be guided (a state where the axis a2 of the external pipe 3 is shifted), and the insertion end 31 has a tapered surface 123. Accordingly, it is guided to the inside of the through hole 12. The water-impervious member 13 is deformed in the range of the space 130 due to its flexibility and rubber elasticity with respect to the axial displacement of the external pipe 3, and follows this to hold the external pipe 3.

  As described with reference to FIG. 1 to FIG. 7, the bottom block 1 constituting the manhole according to the embodiment of the present invention has a pipe joint portion 11, and the pipe joint portion 11 is a saddle base portion. 10 having a through-hole 12 that penetrates the side wall from the outer surface to the inner surface. By connecting the external pipe 3 to the pipe joint portion 11, the through-hole 12 enters the internal space 103 of the manhole. Sewage can be drained.

  In addition, the bottom block 1 has an invert portion 102 on the inner bottom surface of the eaves base portion 10, and constitutes a straight drainage channel that inclines from one opening (inflow hole) to the other opening (outflow hole). Therefore, sewage can flow smoothly.

  The through-hole 12 has an opening 121 on the outer surface side larger in diameter than the opening 122 on the inner surface side and an inner peripheral surface is a tapered surface 123, so that the external pipe 3 is connected to the pipe joint portion 11. The insertion end 31 of the external pipe 3 can be guided to the through hole 12 along the tapered surface 123. Therefore, according to the bottom block 1 and the manhole using the same according to the embodiment of the present invention, even if the pipe joint 11 and the external pipe 3 are misaligned, the external pipe is provided in the through hole 12. 3 can be guided and connected.

  Further, after the external pipe 3 is connected to the pipe joint portion 11, the insertion end 31 is disposed inside the through hole 12, so that earth pressure applied from the surroundings applied to the external pipe 3 or during an earthquake The vibration is supported by the tapered surface 123, for example. Therefore, according to the bottom block 1 and the manhole using the block according to the embodiment of the present invention, it is possible to avoid an accident in which the external piping 3 is dropped due to earth pressure from the surroundings or vibration during an earthquake, and reliably The pipe 3 can be held.

  Furthermore, after the external pipe 3 is connected to the pipe joint portion 11, the external pipe 3 is held in a freely swingable manner within the range of the tapered surface 123. That is, the bottom block 1 according to an embodiment of the present invention and the manhole using the same have a pipe connection structure with a wide movable range. For example, the insertion end 31 of the external pipe 3 due to earth pressure, vibration, or the like. However, even if it slides on the inner peripheral surface of the through-hole 12, it can be held and the problem of falling off from the pipe joint portion 11 can be avoided.

  The bottom block 1 includes a water shielding member 13. Since the water-impervious member 13 is a cylindrical body and has openings 131 and 132 at both ends in the axial direction a1, when the external pipe 3 is connected to the pipe joint part 11, the openings 131 and 132 are used. The insertion end 31 of the external pipe 3 can be guided into the water shielding member 13.

  Since the opening part 132 is embed | buried under the side wall of the pipe joint part 11, the band which was conventionally essential becomes unnecessary for the water-impervious member 13. Therefore, the manufacturing cost can be reduced by reducing the number of parts.

  In addition, since the band is not necessary, the number of steps of attaching the water shielding member 13 and pipe connecting work can be reduced accordingly. Therefore, the construction cost can be reduced.

  Furthermore, since no band is required, the external pipe 3 and the pipe joint portion 11 can be easily and reliably connected regardless of the skill level of the worker. Therefore, cost reduction can be realized by increasing the efficiency of the work of attaching the water shielding member 13 and the pipe connection work.

  Since the opening part 132 is embedded beforehand in the side wall of the pipe joint part 11, the water shielding member 13 does not need to perform the attachment work of the water shielding member 13 and the pipe connection work inside the narrow installation hole. Therefore, cost reduction can be realized by making these operations more efficient.

  The water shielding member 13 can secure a space 130 around the through hole 12 because the opening 132 rises from the outer surface 110 of the pipe joint portion 11. The space 130 is a deformation space for the flexible water shielding member 13 to deform corresponding to the connection direction of the external pipe 3 guided to the through hole 12. Accordingly, the water-impervious member 13 follows the direction of the axis a2 of the external pipe 3 with respect to the shaft misalignment problem that occurs between the axis a1 of the pipe joint portion 11 and the axis a2 of the external pipe 3 to be connected. And you can hold this.

  On the other hand, when the external pipe 3 is connected to the through hole 12, the pipe joint portion 11 has a tapered surface 123 on the inner peripheral surface of the through hole 12, and the external pipe 3 swings within the range of the taper angle. It can be carried out. Here, since the water shielding member 13 rises from the outer surface 110 of the pipe joint portion 11, a space 130 can be secured between the water shielding member 13 and the external pipe 3 connected to the through hole 12. This space 130 is a moving space when the external pipe 3 swings within the range of the taper angle, and the flexible water shielding member 13 is deformed following the movement of the external pipe 3. It becomes a deformation space. Therefore, when the external pipe 3 connected to the through hole 12 swings within the range of the taper angle, the water shielding member 13 follows this without hindering the movement of the external pipe 3 and Can continue to hold.

  8 and 9 are plan views showing another embodiment of the straight wall block 1 according to the present invention. 8 and 9, the same reference numerals are given to the same components as those shown in FIGS. 1 to 7.

  As shown in FIG. 8 thru | or 9, in the bottom lump block 1 which concerns on one Embodiment of this invention, the two pipe joint parts 11 are provided, one is an outflow hole part, and the other is an inflow hole part. Used. Although the number of the pipe joint parts 11 used as the outflow hole part is one, the pipe joint part 11 used as the inflow hole part can be configured to include one or a plurality as necessary.

  The two pipe joint portions 11 can be bent if the respective through holes 12 and the invert portions 102 are connected in a water-permeable manner. That is, since the bottom block 1 according to one embodiment of the present invention has a pipe connection structure with a wide movable range, the arrangement of the pipe joint part 11 and the aspect of the invert part 102 that rolls the pipe joint part 11 are as follows. Can vary.

  Although the contents of the present invention have been specifically described above with reference to the preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.

It is a top view of the straight wall block concerning the present invention. FIG. 2 is an end view taken along line 2-2 in FIG. 1. It is a right side wall view of the straight wall block shown in FIG. It is a left side wall view of the straight wall block shown in FIG. It is a front view which fractures | ruptures and shows a part about the manhole which concerns on this invention. It is a front view which abbreviate | omits and shows the usage aspect of the manhole shown in FIG. It is a front view which abbreviate | omits and shows the usage aspect of the manhole shown in FIG. It is a top view which shows another embodiment about the straight wall block which concerns on this invention. It is a top view which shows another embodiment about the straight wall block which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bottom block 11 Pipe joint part 110 Outer surface of side wall 12 Through hole 121 Opening part on outer surface 122 Opening part on inner surface 123 Tapered surface 13 Water shielding member 131 Small diameter opening part 132 Large diameter opening part 2 Straight wall block

Claims (2)

A manhole bottom block including a pipe joint and a water shielding member,
The pipe joint portion is constituted by the side wall of the manhole bottom block, and has a through hole that penetrates the side wall from the outer surface to the inner surface.
In the through hole, the opening on the outer surface side has a larger hole diameter than the opening on the inner surface side, and the inner peripheral surface is a tapered surface,
The water-impervious member is a flexible cylindrical body, has openings at both ends in the axial direction , and one of the openings and a cylindrical portion continuous to one of the openings are: Embedded in the wall thickness of the pipe joint, and the cylindrical portion is raised from within the outer surface of the pipe joint around the through-hole,
Bottom block for manholes. A manhole including a bottom block for manholes and a straight wall block for manholes,
The manhole bottom block is the one described in claim 1, and the manhole straight wall block is stacked on top.
manhole.

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