JP2019027079A - Sewage bypass device for manhole - Google Patents

Abstract

To provide a widely applicable sewerage bypass device for a manhole allowing for smooth bypass connection of sewer pipes, even when an upstream side sewer pipe and a downstream side sewer pipe connected to the manhole are middle diameter or small diameter pipes.SOLUTION: A sewerage bypass device 1 comprises: an upstream cut-off plug 2A inserted into the outlet of an upstream sewer pipe P1; a downstream cut-off plug 2B inserted into the inlet of a downstream sewer pipe P2; and a bypass pipe 9 with one end connected to the upstream cut-off plug and the other end connected to the downstream cut-off plug. Each cut-off plug has: a roughly cylindrical body 3 made of a rigid material and having a bypass pipe connection part 30; an elastic sleeve 4 made of a rubber-like elastic material and fittedly covering the body, with both ends attached to an outer peripheral surface of the body; and an air pressure supplying device 5 supplying air pressure A to a space S between the elastic sleeve and the body to expand the elastic sleeve to bring the surface of the elastic sleeve into press-contact with an inner peripheral surface of each sewer pipe.SELECTED DRAWING: Figure 1

Description

  The present invention is used for bypassing the upstream sewage pipe and the downstream sewage pipe that communicate with the manhole when various construction work is performed in the manhole so that the sewage does not flow in the manhole. The present invention relates to a manhole sewage bypass device.

The thing of the following patent document 1 is known as a sewage bypass apparatus for making the state which a sewage does not flow in the manhole in the case of construction etc.
The apparatus includes a substantially cylindrical upstream water stop plug inserted into an outlet portion of an upstream sewage pipe and having an outer peripheral portion in watertight contact with an inner peripheral surface of the upstream sewage pipe, and an inlet of the downstream sewage pipe A substantially cylindrical downstream water stop plug that is inserted into the outer peripheral portion so that the outer peripheral portion is in watertight contact with the inner peripheral surface of the downstream sewer pipe, one end is connected to the upstream water stop plug, and the other end is And a bypass pipe connected to the downstream water stop plug.
Each water stop plug includes a short cylindrical screw holding member having a plurality of screw holes formed at intervals in the circumferential direction, and one end portion of the water stop plug on the outer peripheral surface of the screw holding member. A fixed rubber short cylindrical member, an open-loop metal ring and an intermediate ring capable of expanding diameter interposed between the screw holding member and the rubber short cylindrical member, and screw holding And a plurality of screws screwed into the plurality of screw holes of the member from the inside.
According to the above sewage bypass device, when a plurality of screws of each water stop plug are screwed into the screw holes of the screw holding member, the intermediate ring is pressed radially outward at the tip of the screw, and the intermediate ring expands. Thus, the rubber short cylindrical member is brought into pressure contact with the inner peripheral surface of the sewer pipe, and water is stopped at the outlet portion of the upstream sewer pipe and the inlet portion of the downstream sewer pipe. In this state, if both ends of the bypass pipe are connected to both water stop plugs, the sewage discharged from the upstream sewage pipe flows through the bypass pipe and flows into the downstream sewage pipe. Therefore, the sewage does not flow in the manhole, and it is possible to smoothly perform the construction in a dry state.

JP 2013-256806 A

However, in the sewage bypass device described in Patent Document 1, in each water stop plug, water is stopped by the rubber short cylindrical member by screwing a screw into the screw hole of the screw holding member from the inside. When the water pipe and the downstream sewage pipe have a medium diameter or a small diameter (nominal diameter of about 300 mm or less), the diameter of each water stop plug also decreases accordingly.
For this reason, the above-described sewage bypass device is difficult to screw or screw back in the narrow internal space of each water stop plug when the upstream sewage pipe and the downstream sewage pipe have medium or small diameters. Therefore, it could not be applied.

  The present invention has been made in view of the above problems, and even if the upstream sewage pipe and the downstream sewage pipe leading to the manhole are of a medium diameter or a small diameter, the sewage pipes are not connected to each other. An object of the present invention is to provide a manhole sewage bypass device with a wide application range, which can perform bypass connection without hindrance.

  In order to achieve the above object, the present invention comprises the following aspects.

1) A sewage bypass device for bypassing an upstream sewage pipe and a downstream sewage pipe leading to a manhole so that the sewage does not flow in the manhole,
A substantially cylindrical upstream water stop plug that is inserted from one end side into the outlet portion of the upstream sewage pipe and whose outer peripheral portion is brought into watertight contact with the inner peripheral surface of the upstream sewage pipe;
A substantially cylindrical downstream water stop plug that is inserted into the inlet of the downstream sewer pipe from one end side and whose outer peripheral part is brought into watertight contact with the inner peripheral surface of the downstream sewer pipe;
A bypass pipe having one end portion detachably connected to the end portion on the opposite side of the upstream water stop plug and detachably connected to the end portion on the opposite side of the downstream water stop plug. ,
The upstream water stop plug and the downstream water stop plug are each made of a rigid material and having a substantially tubular body having a bypass pipe connecting portion at the end opposite to the insertion side, and a rubber elastic material and the body. And an elastic sleeve whose both ends are attached to the outer peripheral surface of the body, and fluid pressure is supplied to the space between the elastic sleeve and the body so that the surface of the elastic sleeve is the upstream sewage pipe and the downstream side. A manhole sewage bypass device having fluid pressure supply means for expanding so as to be in pressure contact with each inner peripheral surface of the sewage pipe.

2) Each of the elastic sleeves of the upstream side water stop plug and the downstream side water stop plug has a plurality of first rings having a substantially rectangular cross section formed alternately on the surface thereof at intervals in the length direction of the elastic sleeve. A rib, and a plurality of second annular ribs having a substantially semicircular cross section,
The side surface of the first annular rib that is closer to the center of the length of the elastic sleeve of both side surfaces is an inclined surface that gradually decreases in height toward the center of the length of the elastic sleeve, and the other side surface is The sewage bypass device for manholes according to 1), which is a vertical surface orthogonal to the length direction of the elastic sleeve.

3) Each body of the upstream water stop plug and the downstream water stop plug has a substantially cylindrical intermediate member having an annular flange portion projecting radially outward at both ends, and an insertion side end of the intermediate member A first ring-shaped holding member that is screwed to the annular flange portion and sandwiches one end portion of the elastic sleeve together with the annular flange portion, and an annular flange portion that is opposite to the insertion end of the intermediate member. A substantially ring-shaped second clamping member that clamps the other end portion of the elastic sleeve together with the annular flange portion, and a radially outward direction in which one end portion is joined to the second clamping member and the other end portion forms a bypass pipe connecting portion A manhole sewage bypass device according to the above 1) or 2), comprising a pipe connecting member having an annular flange portion projecting into the manhole.

4) Both ends of each of the elastic sleeves of the upstream side water stop plug and the downstream side water stop plug are bent toward the inner peripheral surface side, and the substantially T-shaped crossing in which the tip portion protrudes on both sides in the thickness direction. Has a surface,
Both ends of the elastic sleeve are attached to the annular flange portions at both ends of the intermediate member in each body of the upstream side water stop plug and the downstream side water stop plug, and the opposing surfaces of the first and second holding members screwed to these. The manhole sewage bypass device according to 3) above, wherein a notch that can form an internal enlarged groove into which the tip of the portion is fitted is formed.

5) On the outer peripheral surface of each body of the upstream side water stop plug and the downstream side water stop plug, a part to which the elastic sleeve is not attached is provided in a part of the body in the longitudinal direction. The front ends of the bolts are joined to each other in the circumferential direction at intervals in the circumferential direction, and bolts having heads are screwed into the nuts. Any of the above 1) to 4) is provided with a stopper that is made of a material and is brought into pressure contact with the inner peripheral surface of each of the upstream and downstream sewage pipes when the bolt is screwed into the nut for a required length. Or one manhole sewage bypass device.

  According to the manhole sewage bypass device of 1), each of the upstream side water stop plug and the downstream side water stop plug has a body, an elastic sleeve, and a fluid pressure supply means. When fluid pressure is supplied to the space between the elastic sleeve and the body to expand the elastic sleeve, the surface of the elastic sleeve is brought into pressure contact with the inner peripheral surfaces of the upstream sewer pipe and the downstream sewer pipe. There is no need to perform operations such as screwing or unscrewing in the internal space of each water stop plug as in the device described in Patent Document 1, and therefore the upstream and downstream sewage pipes leading to the manhole. Even if it is a thing with a medium diameter or a small diameter, a water stop plug can be installed and used without difficulty in each sewer pipe.

  According to the manhole sewage bypass device of 2) above, the flat top surface having a relatively large area of the plurality of first annular ribs having a substantially rectangular cross section formed on the surface of the elastic sleeve is provided with the upstream sewage pipe and By being brought into pressure contact with each inner peripheral surface of the downstream sewage pipe, a high water stop effect (sealability) is obtained, and the water stop plug moves in the length direction of the sewage pipe due to dynamic pressure during sewage circulation. A stopper function is provided to prevent this. In particular, the side surface closer to the center of the length of the elastic sleeve among the both side surfaces of the first annular rib is an inclined surface, and the other side surface is a vertical surface. Even when an external force in the length direction of the water pipe is applied, the degree of elastic deformation of the first annular rib is reduced, and the movement (displacement) of the water stop plug is effectively suppressed. In addition to the above, the tops of the plurality of second annular ribs having a substantially semicircular cross section formed on the surface of the elastic sleeve have a relatively small contact area, and each of the upstream and downstream sewer pipes has a relatively small contact area. By being brought into pressure contact with the peripheral surface, an even higher water stop effect (sealability) can be obtained.

According to the manhole sewage bypass device of 3) above, the both end portions of the elastic sleeve are formed by the flange portions at both ends of the intermediate member and the first and second sandwiching members respectively screwed to the flange portions. Since it is pinched, there is a low risk of leakage of fluid supplied to the space between the elastic sleeve and the body, high sealing performance is maintained over a long period of time, and the water stop effect of the water stop plug is also maintained in a good state. Is done.
Further, according to the sewage bypass device 3), even when the elastic sleeve is deteriorated or damaged, the elastic sleeve can be easily replaced and can be used for a long time.

  According to the sewage bypass device for manholes of 4) above, the tip portions of the substantially T-shaped cross sections at both ends bent toward the inner peripheral surface side of the elastic sleeve are joined to the annular flange portions at both ends of the intermediate member and these. Since it is inserted into the internal enlarged groove formed by the notches formed on the opposing surfaces of the first and second clamping members, a higher water-stopping effect (sealability) can be obtained and elastic It is possible to reliably maintain the fluid pressure supplied to the space between the sleeve and the body over a long period of time.

  According to the sewage bypass device for manholes of 5) above, a bolt is screwed into a plurality of nuts joined to the outer peripheral surface of the body, and a stopper made of a rubber-like elastic material is provided on the head of the bolt. It is possible to adjust the screwing amount of the bolt to the nut and press the stopper to the inner peripheral surface of the upstream sewage pipe and the downstream sewage pipe, so even if the dynamic pressure during sewage circulation is high The water stop plug can be more reliably prevented from moving (displaced) in the length direction of the sewer pipe.

It is a vertical sectional view showing the whole manhole sewage bypass device according to the first embodiment of the present invention. It is a vertical sectional view which expands and shows the upstream water stop plug of the device. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is a partial expanded sectional view which shows the surface shape of the elastic sleeve of a water stop plug. It is a sewage bypass device for manholes according to a second embodiment of the present invention, and is a vertical sectional view corresponding to FIG. It is sectional drawing which follows the VII-VII line of FIG. It is a partial expanded sectional view which shows the surface shape of the elastic sleeve of a water stop plug. It is a sewage bypass device for manholes according to a third embodiment of the present invention, and is a vertical sectional view corresponding to FIG. It is sectional drawing which follows the XX line of FIG. It is a partial expanded sectional view which shows the surface shape of the elastic sleeve of a water stop plug.

Embodiments of the present invention will be described below with reference to FIGS.
In the following description, the upper and lower sides in FIGS. 1, 2, 6, and 9 are referred to as “upper and lower”, and the left and right are referred to as “left and right”.

<First Embodiment>
1 to 5 show a manhole sewage bypass device according to a first embodiment of the present invention.
This sewage bypass device (11) bypasses the upstream sewage pipe (P1) and the downstream sewage pipe (P2) communicating with the manhole (M) so that the sewage (D) can pass through the manhole (M). It is a device for preventing the flow. In FIG. 1, the outlet of the upstream sewage pipe (P1) is opened to the right side of the peripheral wall of the manhole (M), and the inlet of the downstream sewage pipe (P2) is the peripheral wall of the manhole (M). It is made to open in the left side part.
As shown in FIG. 1, the entire structure of the sewage bypass device (11) is inserted into the outlet of the upstream sewage pipe (P1) from one end (right end) side and the outer peripheral part of the upstream sewage pipe (P1). Inserted into the inlet of the downstream side sewer pipe (P2) from one end (left end) side, and the outer peripheral part is on the downstream side. A substantially cylindrical downstream water stop plug (2B) that is brought into watertight contact with the inner peripheral surface of the water pipe (P2), and one end (right end) of the upstream water stop plug (2A) on the non-insert side A bypass pipe (9) that is detachably connected to the (left end), and the other end (left end) is detachably connected to the non-insertion side end (right end) of the downstream water stop plug (2B); It has.

  Each of the upstream side water stop plug (2A) and the downstream side water stop plug (2B) is made of a rigid material and has a substantially tubular shape having a bypass pipe connection part (30) at the end opposite to the insertion side. A body (3), an elastic sleeve (4) made of a rubber-like elastic material and fitted on the body (3) and having both ends attached to the outer peripheral surface of the body (3); and an elastic sleeve (4) Air pressure (fluid pressure) (A) is supplied to the space (S) between the body (3) and the surface of the elastic sleeve (4) is connected to the upstream sewer pipe (P1) and the downstream sewer pipe (P2). And an air pressure supply device (fluid pressure supply means) (5) that expands so as to be in pressure contact with each inner peripheral surface.

  The details of the upstream water stop plug (2A) are shown in FIGS. Since the downstream water stop plug (2B) is the same as the upstream water stop plug (2A) except that the arrangement is symmetrical, only the upstream water stop plug (2A) will be described below. This will be described in detail with reference to the drawings.

The body (3) of the upstream water stop plug (2A) includes a cylindrical intermediate member (31) and two left and right ring-shaped flange members joined to the left and right ends of the intermediate member (31) by welding or the like. (32) and an annular flange portion (bypass pipe connecting portion) (331) whose right end portion is joined to the left side (anti-insertion side) flange member (32) and which protrudes radially outward at the left end portion. And a substantially cylindrical pipe connecting member (33).
As the rigid material constituting each of the members (31), (32) and (33) constituting the body (3), steel excellent in corrosion resistance and strength, particularly stainless steel, is preferably used. It is not limited.
Each flange member (32) has an inner diameter substantially the same as the inner diameter of the intermediate member (31) and an outer diameter larger than the outer diameter of the intermediate member (31), and the outer circumference of each flange member (32) A step is formed between the surface and the outer peripheral surface of the intermediate member (31). Further, the outer peripheral surface of each flange member (32) is cut out by a predetermined thickness except for the end opposite to the intermediate member (31), and the cut-out portion is formed by the elastic sleeve (4). The left and right end portions are arranged as attachment bases (321) for attachment to the body (3). An air circulation hole (322) penetrating in the thickness direction is formed in the left side (counter-insertion side) flange member (32).
The pipe connecting member (33) has substantially the same inner diameter and outer diameter as the intermediate member (31). The annular flange part (331) of the pipe connecting member (33) is formed by joining a ring body having a required inner diameter and outer diameter to the left end part (end part on the non-insertion side) of the pipe connecting member (33) by welding or the like. Is formed by. In the annular flange portion (331), a plurality of bolt insertion holes (331a) are formed at equal intervals in the circumferential direction (see FIG. 3).

The elastic sleeve (4) of the upstream water stop plug (2A) has a substantially cylindrical shape and is integrally formed of a rubber-like elastic material such as rubber or elastomer.
Three groove forming annular ribs (410) are formed at equal intervals on the left and right ends of the surface of the elastic sleeve (4), and the annular groove (42) is formed between adjacent ribs (410). Are formed in total. Then, a fixing band (43) made of, for example, stainless steel or the like is attached in a winding shape to these annular grooves (42) and tightened and fixed, so that both ends of the elastic sleeve (4) are attached to the body ( The outer peripheral surface of 3), more specifically, attached to the mounting base (321) of the left and right flange members (32) in an airtight manner.
In addition, a plurality of first annular ribs (411) having a substantially rectangular cross section and a plurality of second annular ribs (412) having a substantially semicircular cross section are provided at the intermediate portion of the length of the surface of the elastic sleeve (4). The elastic sleeves (4) are alternately formed at predetermined intervals in the length direction. As shown in detail in FIGS. 2 and 5, the first annular rib (411) has a side surface closer to the center (C) of the elastic sleeve (4) on the left and right side surfaces of the first annular rib (411). The inclined surface (411a) gradually decreases in height toward the center (C), and the other side surface is a vertical surface (411b) perpendicular to the length direction of the elastic sleeve (4). Yes. When the elastic sleeve (4) is expanded by supplying air pressure (A) to the space (S) on the back side thereof, the flat top surface (411c) of each first annular rib (411) is connected to the upstream sewage pipe ( P1) is pressed against the inner peripheral surface with a relatively large contact area, and the round top (412a) of each second annular rib (412) is relatively close to the inner peripheral surface of the upstream sewage pipe (P1). It can be pressed with a small contact area. Due to the combination of the two types of annular ribs (411) and (412) as described above, the elastic sleeve (4) provides excellent water-stopping effect (sealability) and the dynamic pressure during sewage (D) distribution. Mounting strength that does not move (is not displaced) can be obtained.

The air pressure supply device (5) includes, for example, an air pressure supply source (not shown) such as an air compressor, a base end connected to the air pressure supply source, and a distal end at the body (3) of each water stop plug (2A) (2B). And an air pressure supply pipe (51) connected to the air circulation hole (322) of the flange member (32) at the end opposite to the insertion side.
The connection structure between the tip of the air pressure supply pipe (51) and the air circulation hole (322) is, for example, a male joint member (521) of a simple quick joint and an air circulation hole (322) on the surface of the flange member (32). The female joint member (522) is attached to the tip of the air pressure supply pipe (51), and the joint members (521) and (522) are detachably fitted and connected to each other. Can be used. According to the connection structure, the air supply pipe (51) can be easily attached and detached, and the risk of air pressure leakage and the like is low.
Although not shown, an open / close valve such as a cock or a ball valve is provided in the middle of the air pressure supply pipe (51). When supplying air pressure (A) to the space (S) on the back side of the elastic sleeve (4), or when removing air pressure (A) from the space (S), the open / close valve is set to the open position. On the other hand, while the air pressure (A) supplied to the space (S) is maintained at a predetermined pressure, the on-off valve is set to the closed position.
The fluid pressure supplied to the space (S) on the back side of the elastic sleeve (4) for expansion is not limited to air pressure, and water pressure may be supplied using a pump, for example.

The bypass pipe (9) includes a pipe body (91) having a circular cross section made of stainless steel, for example, and annular flanges (92) respectively joined to both ends of the pipe body (91).
The annular flanges (92) at both ends of the bypass pipe (9) are substantially the same as the annular flange portions (331) of the pipe connecting members (33) in the upstream water stop plug (2A) and the downstream water stop plug (2B). Bolt insertion holes (not shown) are formed at locations corresponding to the plurality of bolt insertion holes (331a) of the annular flange portion (331) of the pipe connection member (33).
Then, the annular flanges (92) of the left and right ends of the bypass pipe (9) are superimposed on the annular flange part (331) of the pipe connecting member (33) in each water stop plug (2A) (2B). By screwing the nut (62) onto the tip of the bolt (61) that has been passed through the bolt insertion hole (331a), both ends of the bypass pipe (9) are inserted in the opposite direction of both water stop plugs (2A) (2B). Each side end is detachably connected.
The configuration and material of the bypass pipe are not limited to the above. For example, it is possible to use a flexible pipe material such as a flexible pipe or a hose as the pipe body, and the bypass pipe and each water plug The connection structure is not limited to the above, and other appropriate connection structures can be employed. In particular, when a flexible pipe material is used as the pipe body of the bypass pipe, connection is possible even if the height and direction of the bypass pipe connection part of both water stop plugs are slightly shifted, and the upstream side sewer pipe When the outlet part and the inlet part of the downstream sewage pipe are open at different heights on the peripheral wall of the manhole, or when both are not aligned in the diameter direction of the manhole but shifted in the circumferential direction. Also, a bypass connection is possible.

Next, an example of the installation procedure of the sewage bypass device (11) will be described with reference to FIG.
First, the upstream water stop plug (2A) is lowered into the manhole (M), inserted into the outlet portion of the upstream sewer pipe (P1) from one end thereof, and disposed at a predetermined location. Then, by operating an air compressor or the like of the air pressure supply device (5), a predetermined air pressure (A) (for example, about 0.2 Mpa) is applied to the space (S) between the elastic sleeve (4) and the body (3). When supplied, the elastic sleeve (4) expands, and the first annular rib (411) and the second annular rib (412) on the surface thereof are brought into pressure contact with the inner peripheral surface of the upstream sewer pipe (P1). The on-off valve in the middle of the air pressure supply pipe (51) is set to the closed position so that this pressure contact state is maintained.
Next, the downstream water stop plug (2B) is lowered into the manhole (M), inserted from one end thereof into the inlet of the downstream sewer pipe (P2), and disposed at a predetermined location. Then, by operating an air compressor or the like of the air pressure supply device (5), a predetermined air pressure (A) (for example, about 0.2 Mpa) is applied to the space (S) between the elastic sleeve (4) and the body (3). When supplied, the elastic sleeve (4) expands and the first annular rib (411) and the second annular rib (412) on the surface thereof are brought into pressure contact with the inner peripheral surface of the downstream sewer pipe (P2). The on-off valve in the middle of the air pressure supply pipe (51) is set to the closed position so that this pressure contact state is maintained.
Thereafter, the annular flange (92) on one end side of the bypass pipe (9) is connected to the annular flange portion (331) of the upstream water stop plug (2A), and the annular flange (92) on the other end side is connected to the downstream water stop plug. The nuts (62) are screwed onto the tip side portions of the bolts (61) passed through the bolt insertion holes (331a), overlapping the annular flange portions (331) of (2B). Thereby, both the water stop plugs (2A) (2B) and the bypass pipe (9) are connected, and the installation of the sewage bypass device (11) is completed.

As described above, according to the manhole sewage bypass device (11) of the first embodiment, the compressor of the air pressure supply device (5) can be used to set both the water stop plugs (2A) and (2B) to the water stop state. Since the elastic sleeve (4) only needs to be inflated by actuating the etc. at a remote position, the upstream sewage pipe (P1) and the downstream sewage pipe (P2) are of medium or small diameter (about 150 to 300φ) Even so, it is possible to install and use the water stop plugs (2A) and (2B) in each sewer pipe (P1) and (P2) without any trouble.
In addition, the sewage bypass device (11) of this embodiment has a relatively simple mounting structure of the elastic sleeve (4) of the (3) to the body in each of the water stop plugs (2A) (2B), thereby reducing the cost. In addition, the first annular rib (411) and the second annular rib (412) formed on the surface of the elastic sleeve (4) provide an excellent water stop effect (sealability) and dynamic pressure during sewage (D) flow. A mounting strength that can sufficiently withstand the above is obtained.
Therefore, in the sewage bypass device (11) of the first embodiment, the upstream sewage pipe (P1) and the downstream sewage pipe (P2) communicating with the manhole (M) have a small diameter of about 150φ. In some cases, it can be suitably used.

<Second Embodiment>
6 to 8 show a manhole sewage bypass device (12) according to a second embodiment of the present invention.
In the sewage bypass device (12) of this embodiment, each body (3X) of the upstream water stop plug (2A) and the downstream water stop plug (not shown) has an annular flange projecting radially outward at both ends. And a substantially cylindrical intermediate member (34) having a portion (341) and an annular flange portion (341) at the insertion side end (right end in FIG. 6) of the intermediate member (34). A substantially ring-shaped first clamping member (35) that clamps one end of the elastic sleeve (4X) together with the annular flange (341), and a non-insertion side end (left end in FIG. 6) of the intermediate member (34) A substantially ring-shaped second clamping member (36) that is screwed to the annular flange portion (341) and sandwiches the other end portion of the elastic sleeve (4X) together with the annular flange portion (341), and one end portion is the second sandwiched A pipe connection member having an annular flange portion (371) which is joined to the member (36) by welding or the like and protrudes radially outward to constitute the bypass pipe connection portion (30) at the other end portion ( 37).

  The intermediate member (34) is formed by joining and integrating flange forming rings made of stainless steel or the like to both ends of a cylindrical body made of stainless steel or the like by welding or the like. The first clamping member (35) and the second clamping member (36) are also formed by ring bodies made of stainless steel or the like. A plurality (eight in this case) of bolt insertion holes (352) and (362) are formed in the first clamping member (35) and the second clamping member (36) at equal intervals in the circumferential direction. Further, the annular flange portions (341) at both ends of the intermediate member (34) have the same number as the bolt insertion holes (352) and (362) of the first clamping member (35) and the second clamping member (36) (here, Then, eight screw holes (341b) are formed at equal intervals in the circumferential direction so as to coincide with the bolt insertion holes (352) and (362). Then, the front end side portion of the bolt (39) inserted through each bolt insertion hole (352) is screwed into the screw hole (341b) and fastened, so that the annular flange portions at both ends of the intermediate member (34) ( 341), the first clamping member (35) and the second clamping member (36) are joined to each other. The inner end opening on the space (S) side of the screw hole (341b) is closed with a lid piece (342) joined to the edge of the opening by welding or the like, thereby the elastic sleeve (4X). The airtightness of the space (S) on the back side is maintained.

  In addition, both ends of each elastic sleeve (4X) of the upstream side water stop plug (2A) and the downstream side water stop plug (not shown) are bent at substantially right angles toward the inner peripheral surface side, The tip portion (44) has a substantially T-shaped cross section projecting on both sides in the thickness direction, that is, on both the left and right sides in FIG. On the surface of the elastic sleeve (4X), a first annular rib (411) and a second annular rib (412) similar to the elastic sleeve (4) of the first embodiment are formed in the middle part of the length. (See FIG. 8).

  And the annular flange part (341) of the insertion side end part (right end part in FIG. 6) of the intermediate member (34) in each body (3X) of the upstream side water stop plug (2A) and the downstream side water stop plug, and A notch (341a) that can constitute an internal enlarged groove (38) into which the tip end portion (44) of one end of the elastic sleeve (4X) is fitted on the opposing surface of the first clamping member (35) to be screw-joined. 351) and the annular flange portion (341) of the intermediate member (34) on the side opposite to the insertion side (the left end portion in FIG. 6) and the second clamping member (36) screwed to the annular flange portion (341) Notches (341a) and (361) that can form an internal enlarged groove (38) into which the tip portion (44) of the other end of the elastic sleeve (4X) is fitted are formed on the opposing surface.

  Although not shown in detail, the annular flange portion (341) of the intermediate member (34) on the side opposite to the insertion side (the left end portion in FIG. 6) and the second clamping member (36) screwed to the annular flange portion (341) An air circulation hole is formed so as to pass through. A male joint member (not shown) joined to the surface of the second clamping member (36) so as to communicate with the air circulation hole, and a female joint member that is detachably fitted to the member and connected. A pneumatic supply pipe (51) is connected via (522).

  Other configurations of the sewage bypass device (12) of the second embodiment are substantially the same as those of the sewage bypass device (11) of the first embodiment shown in FIGS.

According to the sewage bypass device (12) of the second embodiment, the annular flange portions (341) at both end portions of the intermediate member (34) and the first clamping screw-bonded to these annular flange portions (341), respectively. Both ends of the elastic sleeve (4X) are firmly held by the member (35) and the second clamping member (36), and in particular, the crossing of both ends bent to the inner peripheral surface side of the elastic sleeve (4X) The tip portion (44) having a substantially T-shaped surface is formed by the annular flange portions (341) at both ends of the intermediate member (34), and the first and second clamping members (35) and (36) screwed to these. Since it is fitted in the internal enlarged groove (38) formed by the notches (341a) (351) (361) formed on each facing surface, an extremely high mounting sealability is obtained, and therefore an elastic sleeve ( 4X) and the space (S) between the body (3X) has a low risk of air leakage and is extended over a long period of time (eg more than a month) Good seal is maintained and water stop effect by water stopping plug (2A) (2B) is maintained in good condition.
Further, according to the sewage bypass device (12), even if the elastic sleeve (4X) is deteriorated or damaged, the elastic sleeve (4X) can be easily replaced by removing the bolt (39). Can be used over a long period of time.
From the above points, in the sewage bypass device (12) of this embodiment, for example, the upstream sewage pipe (P1) and the downstream sewage pipe (P2) communicating with the manhole (M) have a small diameter of about 200φ. In some cases, it can be suitably used.

<Third Embodiment>
9 to 11 show a manhole sewage bypass device (13) according to a third embodiment of the present invention.
The illustrated sewage bypass device (13) is substantially the same as the sewage bypass device (12) of the second embodiment shown in FIGS. 6 to 8 except for the following points.
That is, in the sewage bypass device (13) of this embodiment, the elastic sleeve (4X) is attached to the outer peripheral surface of each body (3X) of the upstream water stop plug (2A) and the downstream water stop plug (not shown). A plurality of (six in this case) cylindrical nuts (71) are arranged on the outer surface of the pipe connecting member (37), specifically at equal intervals in the circumferential direction with the tip facing radially outward. It is joined every other. A bolt (72) with a head (72a) is screwed into each nut (71). Then, the head (72a) of each bolt (72) is made of a rubber-like elastic material and the bolt (72) is screwed into the nut (71) by a required length, and the upstream sewage pipe (P1) and the downstream A stopper (73) is provided that is pressed against the inner peripheral surface of each side sewer pipe (not shown). On the left and right sides of each nut (71), there is a vertical side of the support plate (74) welded so that the bottom is along the length of the pipe connection member (37) on the outer peripheral surface of the pipe connection member (37). Welded. The stopper (73) is made of, for example, a short cylinder made of rubber, elastomer, or the like, and is bonded and fixed to the head (72a) of the bolt (72) with an adhesive or the like.

According to the manhole sewage bypass device (13) of the third embodiment, the screwing amount of the bolt (72) to the plurality of nuts (71) joined to the outer peripheral surface of the body (3X) is adjusted, The stopper (73) can be brought into pressure contact with the inner peripheral surfaces of the upstream sewage pipe (P1) and the downstream sewage pipe, and even when the flow rate of sewage (D) is large and the dynamic pressure is high, It is possible to more reliably prevent the water stop plug (2A) from shifting in the length direction of the sewer pipe (P1).
Therefore, this embodiment of the sewage bypass device (13) is, for example, the case where the upstream sewage pipe (P1) and the downstream sewage pipe (P2) leading to the manhole (M) have a medium diameter of about 250 to 300φ. It can be preferably used.

  The present invention is used for bypassing the upstream sewage pipe and the downstream sewage pipe that communicate with the manhole when various construction work is performed in the manhole so that the sewage does not flow in the manhole. In particular, it is preferably used when the upstream sewage pipe and the downstream sewage pipe have a medium diameter or a small diameter.

(M): Manhole
(P1): Upstream sewage pipe
(P2): Downstream sewer pipe
(D): Sewage
(11) (12) (13): Manhole sewage bypass device
(2A): Upstream water stop plug
(2B): Downstream water stop plug
(3) (3X): Body
(30): Bypass pipe connection
(34): Intermediate member
(341): Annular flange
(341a): Notch
(35): First clamping member
(351): Notch
(36): Second clamping member
(361): Notch
(37): Pipe connection member
(371): Annular flange
(38): Internal expansion groove
(4) (4X): Elastic sleeve
(411): First annular rib
(411a): Inclined surface
(411b): Vertical plane
(412): Second annular rib
(44): End portion of a substantially T-shaped cross section (at both ends of the elastic sleeve)
(S): Space between the elastic sleeve and the body
(A): Air pressure
(5): Air pressure supply device (fluid pressure supply means)
(71): Nut
(72): Bolt
(72a): Head
(73): Stopper
(9): Bypass pipe

Claims (5)

A sewage bypass device for bypassing an upstream sewage pipe and a downstream sewage pipe communicating with a manhole to prevent the sewage from flowing through the manhole,
A substantially cylindrical upstream water stop plug that is inserted from one end side into the outlet portion of the upstream sewage pipe and whose outer peripheral portion is brought into watertight contact with the inner peripheral surface of the upstream sewage pipe;
A substantially cylindrical downstream water stop plug that is inserted into the inlet of the downstream sewer pipe from one end side and whose outer peripheral part is brought into watertight contact with the inner peripheral surface of the downstream sewer pipe;
A bypass pipe having one end portion detachably connected to the end portion on the opposite side of the upstream water stop plug and detachably connected to the end portion on the opposite side of the downstream water stop plug. ,
The upstream water stop plug and the downstream water stop plug are each made of a rigid material and having a substantially tubular body having a bypass pipe connecting portion at the end opposite to the insertion side, and a rubber elastic material and the body. And an elastic sleeve whose both ends are attached to the outer peripheral surface of the body, and fluid pressure is supplied to the space between the elastic sleeve and the body so that the surface of the elastic sleeve is the upstream sewage pipe and the downstream side. A manhole sewage bypass device having fluid pressure supply means for expanding so as to be in pressure contact with each inner peripheral surface of the sewage pipe. The elastic sleeves of the upstream side water stop plug and the downstream side water stop plug have a plurality of first annular ribs having a substantially rectangular cross section formed alternately on the surface thereof at intervals in the length direction of the elastic sleeve. A plurality of second annular ribs having a substantially semicircular cross section,
The side surface of the first annular rib that is closer to the center of the length of the elastic sleeve of both side surfaces is an inclined surface that gradually decreases in height toward the center of the length of the elastic sleeve, and the other side surface is The sewage bypass device for manholes according to claim 1, wherein the sewage bypass device for manholes has a vertical surface orthogonal to the length direction of the elastic sleeve.   Each body of the upstream water stop plug and the downstream water stop plug includes a substantially cylindrical intermediate member having annular flange portions protruding radially outward at both ends, and an insertion side end portion of the intermediate member. A substantially ring-shaped first clamping member that is screwed to the annular flange portion and clamps one end portion of the elastic sleeve together with the annular flange portion, and an annular flange portion that is screw-joined to the annular flange portion of the intermediate member on the side opposite to the insertion side A substantially ring-shaped second clamping member that clamps the other end portion of the elastic sleeve together with the flange portion, and one end portion joined to the second clamping member, and the other end portion projects radially outward to constitute a bypass pipe connecting portion. The sewage bypass device for manholes according to claim 1 or 2, comprising a pipe connecting member having an annular flange portion. Both ends of the elastic sleeves of the upstream side water stop plug and the downstream side water stop plug are bent toward the inner peripheral surface side, and a substantially T-shaped cross section in which the tip portion protrudes on both sides in the thickness direction. It is supposed to have
Both ends of the elastic sleeve are attached to the annular flange portions at both ends of the intermediate member in each body of the upstream side water stop plug and the downstream side water stop plug, and the opposing surfaces of the first and second holding members screwed to these. The sewage bypass device for manholes according to claim 3, wherein a notch that can constitute an internal enlarged groove into which a tip portion of the portion is fitted is formed. On the outer peripheral surface of each body of the upstream side water stop plug and the downstream side water stop plug, a part to which the elastic sleeve is not attached is provided in a part of the body in the longitudinal direction. Are attached to each nut at intervals in the circumferential direction, and a bolt having a head is screwed into each nut, and the head of each bolt is made of a rubber-like elastic material. And a stopper that is brought into pressure contact with the inner peripheral surface of each of the upstream sewer pipe and the downstream sewer pipe in a state where the bolt is screwed into the nut by a required length. The sewage bypass device for manholes described in 1.

Images