JP2006037370A - Draining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a baffle device with an improved work execution property and a reduced size which hardly disturbs work in a manhole. <P>SOLUTION: The section of a baffle body 21 of the baffle device 1 is formed in a flattened circular shape having a sectional area equal to the sectional area of an inflow pipe 9 of the manhole 2. The section of a vertical pipe connection port of the baffle device 11 and the section of a flattened cylindrical pipe are formed in flattened circular shapes equal to that of the section of the baffle body 21. Sectional areas of the baffle device 1 and the flattened cylindrical pipe are set substantially equal to the sectional area of the inflow pipe 9. The baffle device 1 and the flattened cylindrical pipe are not protruded so much from the inside surface of the manhole 2 while keeping draining capability by the baffle device 1 and the flattened cylindrical pipe. The baffle device 1 and the flattened cylindrical pipe can be made further compact, thus improving the work execution property. The maintenance and management of the manhole 2 can be facilitated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drainage device mounted in a manhole.

  Conventionally, in this type of manhole, if there is a large drop between the inflow pipe provided on the manhole and the bottom of the manhole, scattering, erosion, noise, etc. In order to prevent this, a so-called manhole outside auxiliary pipe device as a drainage device is provided on the outer surface of the manhole.

  However, when installing the manhole outer sub pipe device on the outer surface of the manhole, it is necessary to dig up the ground outside the manhole, so that the construction of the manhole outer sub pipe device takes time and cost.

  Therefore, instead of this type of manhole outside auxiliary pipe device, an in-manhole auxiliary pipe device attached to the inner surface of the manhole has been proposed. This in-manhole secondary pipe device has an L-shaped side view and a bent joint having a circular cross section. An inflow port having a circular cross section is opened on the inflow side which is one end of the bent joint. Furthermore, a connection port having a circular cross section that opens in a direction bent at a right angle to the inflow port is provided on the outflow side that is the other end of the bent joint.

  Then, the bent joint is inserted into the manhole, and the inlet of the bent joint is connected to and connected to the inflow conduit of the manhole with the connection port of the bent joint facing the bottom of the manhole. Furthermore, there is known a configuration in which one end of an elongated cross-section circular cylindrical tube is connected to the connection port of the bent joint, and the other end of the tube projects to the vicinity of the bottom of the manhole (for example, (See Patent Documents 1 to 3.)

  On the other hand, sewage pipes connected between manholes flow sewage using the gradient of the sewage pipes themselves. For this reason, when the length of this sewer pipe becomes long, since the depth which embeds this sewer pipe must be deepened, the maintenance management of these sewer pipes and manholes is not easy. Therefore, a manhole installed as an intermediate facility of this sewer pipe is appropriately installed as a manhole pump, and sewage is pumped up with this manhole pump to reduce the burial depth of the sewer pipe, and then again. Sewage is drained using a gradient.

In other words, the manhole pump has a large drop between the manhole inflow conduit and the bottom of the manhole. I have.
Japanese Patent No. 3443118 (page 4-9, Fig. 1-2) Japanese Patent No. 2886482 (page 2-3, FIG. 4) Utility Model Registration No. 2592718 (page 1-2, FIG. 3)

  However, in the above-described manhole sub-pipe apparatus, the construction is easy, but the manhole sub-pipe apparatus protrudes inward from the inner side surface of the manhole, which disturbs maintenance in the manhole. There is a fear.

  In particular, when the inner diameter of the manhole is relatively small, the work in the manhole is not easy. In addition, the pump baffle device installed in the manhole is relatively small, but the workability of the baffle device is not so good.

  In addition, when an easily constructed manhole sub-pipe device is used for this pump, the outflow pipe connected to this manhole pump must be piped into the manhole. There is a problem that maintenance of the pump becomes almost impossible.

  This invention is made | formed in view of such a point, and it aims at providing the drainage apparatus with favorable workability | operativity, small size, and being hard to obstruct the operation | work in a manhole.

  The drainage device according to claim 1 is a drainage device attached to a manhole having a substantially cylindrical manhole body and an inflow pipe which is provided on a side surface portion of the manhole body and allows drainage to flow into the manhole body. A main body having a substantially flat circular cross section that is attached to the inner surface of the manhole main body in a state in which the major axis direction is along the circumferential direction of the manhole main body of the manhole, and the main pipe is provided on the inflow pipe. An inflow port that is attached in communication, and a connection port having a substantially flat circular cross section having a major axis direction along the major axis direction of the main body portion that opens toward the lower end side of the manhole main body and communicates with the inflow port And an upper end portion attached to the connection port, and a connection tube having a substantially flat circular cylindrical section substantially equal to the connection port.

  The inflow port provided in the main body portion having a substantially flat circular cross section is communicated with the inflow pipe provided in the side surface portion of the manhole body of the manhole, and the cross section is substantially flat having a major axis direction along the major axis direction of the main body portion. The circular connection port is opened toward the lower end side of the manhole body. In this state, in a state where the major axis direction of the main body portion is aligned with the circumferential direction of the manhole main body, the main body portion is attached to the inner side surface of the manhole main body, and then the connection pipe having a substantially flat circular cylindrical cross section substantially equal to the connection port. Attach the upper end of the to the connection port. At this time, the major axis direction of the main body portion having a substantially flat circular cross section is along the circumferential direction of the manhole main body, and the connection port is a substantially flat circular shape cross section having a long diameter direction along the major axis direction of the main body portion. Has a substantially flat circular cross section substantially equal to the connection port. Therefore, the projecting direction from the inner surface of the manhole body of each of the main body part, the connection port, and the connection pipe is the short diameter direction of each of the main body part, the connection port, and the connection pipe. Therefore, compared with the case where these main body parts, connection ports, and connection pipes have a circular cross section, each of these main body parts, connection ports, and connection pipes does not protrude much from the inner surface of the manhole main body while maintaining the drainage capacity. As a result, the workability of the main body and the connecting pipe is good and the size is reduced, so that the main body and the connecting pipe are unlikely to obstruct the work in the manhole.

  A drainage device according to a second aspect is the drainage device according to the first aspect, wherein the lower end portion of the connection pipe is curved with respect to the upper end portion of the connection pipe.

  And since the lower end part of a connecting pipe is curving with respect to the upper end part of this connecting pipe, the momentum of the waste_water | drain which flows in from the inflow pipe of a manhole can be suppressed by the curved part of the lower end part of a connecting pipe. For this reason, since the waste water flowing from the manhole inflow pipe does not strike the bottom of the manhole body vigorously, erosion of the manhole bottom can be suppressed.

  A drainage device according to a third aspect is the drainage device according to the first aspect, wherein the drainage device is attached to the lower end portion of the connection pipe and has a curved joint for bending the lower end portion of the connection pipe.

  And by attaching the curved joint which curves the lower end part of this connecting pipe to the lower end part of a connecting pipe, the momentum of the waste_water | drain flowing in from the inflow pipe of a manhole can be suppressed with a curved joint. For this reason, since the waste water flowing from the manhole inflow pipe does not strike the bottom of the manhole body vigorously, erosion of the manhole bottom can be suppressed.

  A drainage device according to a fourth aspect is the drainage device according to any one of the first to third aspects, wherein the cross-sectional area perpendicular to the axial direction of the main body is substantially equal to the cross-sectional area perpendicular to the axial direction of the inflow pipe. Are equal.

  And, by making the cross-sectional area perpendicular to the axial direction of the main body part substantially equal to the cross-sectional area perpendicular to the axial direction of the inflow pipe, the drainage capacity of these main body parts and the inflow pipe becomes substantially the same. The drainage capacity of the inflow pipe can be maintained in the main body.

  The drainage device according to claim 5 is the drainage device according to any one of claims 1 to 3, wherein the cross-sectional area perpendicular to the axial direction of the main body is smaller than the cross-sectional area perpendicular to the axial direction of the inflow pipe. Is.

  The main body can be made smaller by making the cross-sectional area perpendicular to the axial direction of the main body smaller than the cross-sectional area perpendicular to the axial direction of the inflow pipe.

  A drainage device according to a sixth aspect is the drainage device according to any one of the first to fifth aspects, wherein the connecting pipe is made of a synthetic resin and is molded by blow molding.

  And since a connection pipe can be easily manufactured from a cylindrical body made of a synthetic resin and having a circular cross section by molding the connection pipe by a synthetic resin, this connection pipe can be easily manufactured.

  A drainage device according to a seventh aspect is the drainage device according to any one of the first to fifth aspects, wherein the connecting pipe is made of synthetic resin and is formed by extrusion molding.

  And since a connection pipe can be easily manufactured from a cylindrical body made of a synthetic resin and having a circular cross section by forming the connection pipe as a synthetic resin by extrusion molding, the connection pipe can be easily manufactured.

  According to the drainage device of claim 1, a cross-section having a major axis direction along the major axis direction of the main body portion along the major axis direction of the main body portion of the manhole along the major axis direction of the main body portion having a substantially flat circular cross section. By adopting a substantially flat circular shape and a connection pipe having a substantially flat circular cross section substantially equal to the connection port, the projecting direction from the inner surface of the manhole main body of each of the main body part, the connection port and the connection pipe is the main body part, Since the connection port and the connection pipe are in the short diameter direction, the main body, the connection port, and the connection pipe do not protrude from the inner surface of the manhole body while maintaining the drainage capacity. Therefore, it is possible to make the main body and the connecting pipe difficult to obstruct the work in the manhole.

  According to the drainage device of the second aspect, since the momentum of the drainage flowing from the inflow pipe of the manhole can be suppressed by the curved portion of the lower end portion of the connection pipe, the drainage flowing from the inflow pipe of the manhole is at the bottom of the manhole body. Since it won't hit with force, erosion at the bottom of this manhole can be suppressed.

  According to the drainage device of claim 3, since the momentum of the drainage flowing from the manhole inflow pipe can be suppressed by the curved joint, the drainage flowing from the manhole inflow pipe does not strike the bottom of the manhole body vigorously. Erosion at the bottom of the manhole can be suppressed.

  According to the drainage device of claim 4, the drainage of the main body part and the inflow pipe is made substantially equal to the cross-sectional area perpendicular to the axial direction of the inflow pipe. Since the capacities are substantially the same, the drainage capacity of the inflow pipe can be maintained in the main body.

  According to the drainage device of the fifth aspect, the main body can be made smaller by making the cross-sectional area perpendicular to the axial direction of the main body smaller than the cross-sectional area perpendicular to the axial direction of the inflow pipe. .

  According to the drainage device of the sixth aspect, since the connecting pipe is made of synthetic resin by blow molding, the connecting pipe can be easily manufactured from the cylindrical body having a circular cross section made of synthetic resin. Easy to manufacture.

  According to the drainage device of the seventh aspect, the connecting pipe can be easily manufactured from a cylindrical body having a circular cross section made of synthetic resin by forming the connecting pipe by a synthetic resin by extrusion molding. Easy to manufacture.

  The configuration of the drainage device according to the first embodiment of the present invention will be described with reference to FIGS.

  1 to 5, reference numeral 1 denotes a baffle device as a drainage device. This baffle device 1 is a sewerage relay facility, and is installed in a manhole 2 buried under the ground surface GL and attached to a manhole drainage device. It is. That is, the baffle device 1 prevents sewage scattering, erosion, noise, and the like as wastewater flowing into the manhole 2 and is formed of a synthetic resin such as vinyl chloride resin.

  Here, the manhole 2 is made of concrete, for example, No. 2 manhole. As shown in FIGS. 1 and 6, the manhole 2 includes an elongated and substantially cylindrical manhole body 3. The manhole body 3 is embedded in the ground below the ground surface GL in a state where the axial direction is along the vertical direction which is the vertical direction. Further, on the upper end side that is one end side in the axial direction of the manhole body 3, a conical surface-shaped diameter-reducing portion 4 for reducing the diameter of the upper end side of the manhole body 3 is provided. The reduced diameter portion 4 is formed in a tapered shape in which the inner diameter dimension and the outer diameter dimension are gradually reduced toward the upper end side of the manhole body 3.

  Further, an insertion opening 5 that opens the upper side of the manhole body 3 is provided on the upper end side of the reduced diameter portion 4. The insertion opening 5 is opened in the manhole body 3 and extends along the ground surface GL. In addition, a disc-like lid body 6 that can open and close the insertion opening 5 is detachably attached to the insertion opening 5. The lid body 6 is detachably fitted to the insertion opening 5 in a state where the upper side surface that is the surface side of the lid body 6 is along the ground surface GL.

  An inflow opening 8 penetrating in the radial direction, which is the thickness direction of the manhole body 3, is formed in the cylindrical wall surface portion 7 constituting the side surface portion of the manhole body 3. The inflow opening 8 is an opening through which sewage flows into the manhole body 3, and is provided at a central portion in the height direction that is the vertical direction of the manhole body 3. An elongated cylindrical inflow pipe 9 is attached to the inflow opening 8. Accordingly, the inflow pipe 9 functions as an inflow pipe through which sewage flows into the manhole body 3 from the inflow opening 8. Here, the inflow pipe 9 is made of a synthetic resin and is an elongated cylindrical pipe body having a circular cross section.

  Further, between the inflow pipe 9 and the inflow opening 8 of the manhole 2, a cylindrical manhole as an attachment member for concentrically attaching the downstream side which is one end of the inflow pipe 9 to the inflow opening 8 of the manhole 2. A joint 11 is attached. The manhole joint 11 is inserted into the inflow opening 8 of the manhole 2, and the lower end side of the inflow pipe 9 is fitted into the manhole joint 11. That is, the downstream side of the inflow pipe 9 is supported by the manhole joint 11 and attached so as to be substantially flush with the inner surface of the wall surface portion 7 of the manhole body 3.

  Further, a bottom surface portion 12 that closes the lower end side of the manhole body 3 is provided on the lower end side that is the other end side in the axial direction of the manhole body 3. A flow path forming body 13 that forms a flow path through which sewage stored in the manhole body 3 on the bottom surface portion 12 flows is put on the bottom surface portion 12 with concrete. The flow path forming body 13 guides the sewage flowing in from the inflow opening 8 of the manhole 2 to the central portion on the bottom surface portion 12 of the manhole 2. That is, a channel recess 14 having a circular shape in a top view is provided at the center of the channel forming body 13.

  A pump 15, which is a device for pumping up sewage stored in the manhole 2 and discharging it to the outside, is attached to the channel recess 14 of the channel forming body 13. The pump 15 is connected to an upstream end which is one end of an elongated cylindrical outflow pipe 16. The outflow pipe 16 is provided above the manhole 2 along the wall surface portion 7 of the manhole 2, and passes through the wall surface portion 7 to the outside above the wall surface portion 7 of the manhole 2. The downstream end is projected. Further, a water stop valve 17 as a valve device capable of opening and closing the outflow pipe 16 is attached to the upstream side of the outflow pipe 16 piped in the manhole 2.

  On the other hand, the baffle device 1 is attached to the inflow opening 8 of the manhole 2 from the inside of the wall surface portion 7 of the manhole 2. And this baffle apparatus 1 is provided with the baffle main body 21 which is a main-body part as a main body. The baffle body 21 has a substantially flat circular horizontal cross section that is a cross section perpendicular to the axial direction. The baffle body 21 is formed in an elliptical cross section as a substantially flat cylindrical shape having a cross-sectional area substantially equal to the cross-sectional area of the cross section perpendicular to the axial direction of the inflow pipe 9. Specifically, the baffle body 21 has a ratio of the major axis to the minor axis of the horizontal section of the baffle body 21 in order to reduce the size of the baffle body 21 while maintaining the drainage capacity of the baffle body 21. , Preferably 1.5 or more and 2.5 or less, more preferably 2.0.

  Here, as shown in FIG. 5, when the cross-sectional area of the baffle main body 21 is made substantially equal to VU150 (inner diameter 154 mm, cross-sectional area 5929π), which is a VU pipe as a vinyl chloride pipe, for example. If the ratio of the major axis to the minor axis is 1.5, the major axis of the baffle body 21 is about 189 mm and the minor axis is about 126 mm. When the ratio of the major axis to the minor axis of the baffle body 21 is 2.0, the major axis of the baffle body 21 is about 220 mm and the minor axis is about 110 mm. The area is 6050π. Further, when the ratio of the major axis to the minor axis of the baffle body 21 is 2.5, the major axis of the baffle body 21 is about 245 mm and the minor axis is about 98 mm.

  Further, the baffle main body 21 is attached to the inner side surface of the wall surface portion 7 in a state where the major axis direction which is the longitudinal direction of the baffle main body 21 is aligned with the circumferential direction of the wall surface portion 7 of the manhole 2. A circular drainage inlet 22 as an inlet communicating with the downstream end of the inlet pipe 9 of the manhole 2 is formed in one side surface of the baffle body 21 in the minor axis direction. The drainage inlet 22 opens toward the short diameter direction of the baffle body 21, which is a direction orthogonal to the axial direction and the long diameter direction of the baffle body 21.

  Further, the drainage inlet 22 has an inner diameter dimension such that the downstream end of the inflow pipe 9 of the manhole 2 is fitted, that is, an inner diameter dimension slightly larger than the outer diameter dimension of the inflow pipe 9. In other words, the drainage inlet 22 has a nominal diameter dimension substantially equal to the nominal diameter dimension of the inflow pipe 9. Further, a baffle body 21 is attached to the inner side surface of the wall surface portion 7 of the manhole 2 at the outer edge of the drainage inlet 22 in a state where the drainage inlet 22 communicates with the inflow pipe 9 of the manhole 2. An annular saddle portion 23 is provided as a flange portion to be fixed.

  The saddle portion 23 is provided over the entire circumference along the circumferential direction of the drainage inlet 22. Further, the saddle portion 23 attaches the baffle body 21 to the inner surface of the wall surface portion 7 of the manhole 2 in a state where the axial direction of the baffle body 21 is along the vertical direction of the manhole 2. That is, the saddle portion 23 is formed in an arc shape that is curved along the circumferential direction of the inner side surface of the wall surface portion 7 of the manhole 2 when viewed from above. In other words, the saddle portion 23 is formed in a curved surface shape along the inner surface of the wall surface portion 7 of the manhole 2.

  Further, the saddle portion 23 is formed in a substantially rectangular shape when viewed from the front. At each corner portion of the saddle portion 23, attachment holes 24 for attaching the saddle portion 23 to the wall surface portion 7 of the manhole 2 are formed. A concrete nail (not shown) as a fixing means such as a fixing bolt is inserted into each of the mounting holes 24 and driven into the wall surface portion 7 of the manhole 2 so that the saddle portion 23 is attached to the wall surface portion 7. To fix.

  An annular holding recess 25 as a holding portion along the circumferential direction of the drainage inlet 22 is provided on one side face of the saddle portion 23 facing the opening direction of the drainage inlet 22. An annular packing 26 as a watertight holding member is attached to the holding recess 25. This packing 26 water-tightly connects the drainage inlet 22 of the baffle body 21 to the inflow opening 8 of the manhole 2. That is, the packing 26 connects the drainage inlet 22 of the baffle body 21 to the downstream end of the inflow pipe 9 in a watertight manner.

  Further, a cleaning port 27 is provided on the upper end side which is one end of the baffle body 21 in the axial direction so that the inside of the baffle body 21 can be opened and cleaned. The cleaning port 27 is also a hole for venting air when sewage flows into the baffle body 21. The cleaning port 27 is formed in a cylindrical shape with a circular cross section having an inner diameter dimension slightly smaller than the minor diameter dimension of the baffle body 21. Further, the cleaning port 27 protrudes toward the upper end side of the baffle main body 21 and is provided at the central portion in the major axis direction that is the longitudinal direction of the baffle main body 21. Further, as shown in FIG. 3, the cleaning port 27 is provided at the upper end portion of a portion obtained by gradually reducing the diameter of the upper end side of the baffle body 21 into an arc shape. Then, a lid body (not shown) that allows opening and closing of the cleaning port 27 is attached to the cleaning port 27 so as to be detachably fitted as necessary.

  Further, on the lower end side which is the other end in the axial direction of the baffle main body 21 located on the opposite side of the cleaning port 27, a vertical pipe connection port 28 having an elliptical cross section as a connection port substantially equal to the cross section of the baffle main body 21 is provided. Is provided. The vertical pipe connection port 28 is formed in an elliptical cross section having an inner dimension equal to the outer dimension of the baffle body 21, and has a major axis dimension along the major axis dimension of the baffle body 21. The vertical pipe connection port 28 is provided at a position spaced from the saddle portion 23 toward the outer surface side of the baffle body 21.

  Further, the vertical pipe connection port 28 is formed in an elliptical cylinder shape that protrudes and opens toward the lower end side of the baffle body 21, and communicates with the drainage inlet 22 through the baffle body 21. That is, the vertical pipe connection port 28 opens along the axial direction of the baffle body 21 and opens in directions orthogonal to the short diameter direction and the long diameter direction of the baffle body 21. In other words, the vertical pipe connection port 28 opens in a direction perpendicular to the opening direction of the drainage inflow port 22.

  At this time, the baffle body 21 is attached to the inner side surface of the wall surface portion 7 of the manhole 2 with the vertical pipe connection port 28 facing the bottom surface portion 12 side of the manhole 2. Then, one end portion of the flat cylindrical tube 31 which is a vertical tube as an elongated cylindrical connecting tube is fitted into the vertical tube connection port 28 by being internally fitted and bonded and fixed. The flat cylindrical tube 31 is made of synthetic resin such as vinyl chloride resin, and is formed by blow molding or extrusion molding. Further, the flat cylindrical tube 31 is an elongated cylindrical body having an elliptical cross-section in a top view substantially equal to the cross-sectional shape of the baffle body 21.

  The flat cylindrical tube 31 is attached in such a manner that the upstream side which is one end of the flat cylindrical tube 31 is fitted into the vertical tube connection port 28 of the baffle body 21 and attached to the other end of the flat cylindrical tube 31. The downstream side is projected to a position close to the surface of the flow path forming body 13 of the manhole 2 and extended. That is, the flat cylindrical tube 31 is formed along the axial direction of the wall surface portion 7 of the manhole 2 with the upstream side of the flat cylindrical tube 31 fitted to the vertical tube connection port 28 of the baffle body 21. A flat cylindrical tube 31 is extended to the bottom surface portion 12 side of 2 to prevent sewage flowing from the flat cylindrical tube 31 from scattering in the manhole 2, erosion of the bottom surface portion 12 of the manhole 2, noise, and the like. .

  Next, the operation of the drainage device of the first embodiment will be described.

  First, sewage flowing into the manhole 2 from the inflow pipe 9 flows from the inflow pipe 9 into the baffle body 21 of the baffle apparatus 1 through the drainage inlet 22 of the baffle apparatus 1.

  The sewage that has flowed into the baffle body 21 collides with its own weight acting on the sewage itself or the inner surface of the baffle body 21 opposite to the drainage inlet 22 and the vertical pipe of the baffle device 1. It flows into the flat cylindrical tube 31 through the connection port 28.

  Further, the sewage flowing into the flat cylindrical tube 31 is discharged from the lower end portion of the flat cylindrical tube 31 and stored in the manhole 2. For this reason, the sewage splashing, the erosion of the bottom surface portion 12 of the manhole 2 and the flow path forming body 13, noise, and the like that may occur when sewage flows into the manhole 2 from the inflow pipe 9 are caused by the baffle device 1. Is prevented.

  The sewage stored in the manhole 2 is pumped up by the pump 15 and discharged to the outside of the manhole 2 through the inflow pipe 9.

  When inspecting or cleaning the inside of the baffle device 1, first, the lid body 6 is removed from the insertion opening 5 of the manhole 2 and the insertion opening 5 is opened.

  Next, it enters the manhole 2 from the insertion opening 5. At this time, if a lid is attached to the cleaning port 27 of the baffle device 1 in the manhole 2, the lid is removed from the cleaning port 27, the cleaning port 27 is opened, and the baffle device 1 is opened. The inside of the baffle main body 21 can be inspected or cleaned.

  As described above, according to the first embodiment, the horizontal cross section of the baffle body 21 of the baffle device 1 attached to the inflow opening 8 of the manhole 2 is cut substantially equal to the cross sectional area of the inflow pipe 9 of the manhole 2. It was made into the substantially flat circular shape which has an area. Further, the horizontal cross sections of the vertical pipe connection port 28 of the baffle device 1 and the flat cylindrical pipe 31 connected to the vertical pipe connection port 28 are also substantially flat circles having the same shape as the horizontal cross section of the baffle body 21. Shaped. At this time, by making the cross-sectional areas of the baffle device 1 and the flat cylindrical tube 31 substantially equal to the cross-sectional area of the inflow tube 9, the drainage capacities of the baffle device 1, the flat cylindrical tube 31 and the inflow tube 9 are substantially the same. become.

  Therefore, the baffle device 1 with the longitudinal pipe connection port 28 facing downward while keeping the longitudinal direction of the baffle body 21 of the baffle device 1 along the circumferential direction of the wall surface portion 7 of the manhole 2. The drainage inlet 22 is connected to the inflow pipe 9 of the manhole 2 and is attached to the vertical pipe connection port 28 of the baffle device 1.

  As a result, the baffle body 21 of the baffle device 1, the vertical pipe connection port 28, and the flat cylindrical pipe 31 respectively protrude in the radial direction from the inner surface of the wall surface portion 7 of the manhole body 3. Each of the longitudinal tube connection port 28 and the flat cylindrical tube 31 is in the short diameter direction. Therefore, the baffle device 1 and the flat cylindrical tube 31 are compared with the case where the horizontal cross section perpendicular to the axial direction of each of the baffle body 21, the vertical tube connection port 28 and the flat cylindrical tube 31 of the baffle device 1 is circular. Each of the baffle device 1 and the flat cylindrical tube 31 does not protrude so much from the inner side surface of the wall surface portion 7 of the manhole 2 while maintaining the drainage capacity.

  Therefore, since the baffle device 1 and the flat cylindrical tube 31 become smaller and compact, it is possible to improve the workability when attaching the baffle device 1 and the flat cylindrical tube 31 or at the time of inspection or cleaning. Further, since the baffle device 1 and the flat cylindrical tube 31 do not protrude too much into the manhole 2, the baffle device 1 and the flat cylindrical tube 31 do not easily get in the way when an operator enters the manhole 2 to work. Therefore, the maintenance of this manhole 2 can be facilitated.

  Further, the flat cylindrical tube 31 having a substantially flat circular cross section perpendicular to the axial direction is made of synthetic resin, and the flat cylindrical tube 31 is formed by blow molding or extrusion molding. As a result, even if the horizontal cross-section is a flat cylindrical tube 31 having a substantially flat circular shape, the flat cylindrical tube 31 can be manufactured by simply blow-molding a cross-sectional circular tube of an existing standard, or an existing extrusion molding (not shown) Since the flat cylindrical tube 31 can be manufactured simply by using a sizing die in the apparatus, the flat cylindrical tube 31 can be easily manufactured.

  Furthermore, the horizontal cross sections of the baffle device 1 and the flat cylindrical tube 31 are formed into an elliptical shape in which the ratio of the major axis to the minor axis is 1.5 or more and 2.5 or less. While maintaining the drainage capacity, each of the baffle device 1 and the flat cylindrical tube 31 has a shape suitable for making it compact.

  In the first embodiment, the cross-sectional areas of the baffle device 1 and the flat cylindrical tube 31 are substantially equal to the cross-sectional area of the inflow tube 9 of the manhole 2. The area can be made smaller than the cross-sectional area of the inflow pipe 9 of the manhole 2. As a result, while the baffle device 1 and the flat cylindrical tube 31 are made smaller, the drainage capacity of the baffle device 1 and the flat cylindrical tube 31 can be reduced to a level that is not practically problematic.

  Further, in the first embodiment, the configuration in which the lower end side of the flat cylindrical tube 31 is linearly protruded so as to face the bottom surface portion 12 of the manhole 2 has been described, but the second embodiment shown in FIG. As in this embodiment, the lower cylindrical end of the flat cylindrical tube 31 can be bent. In this case, the lower end side of the flat cylindrical tube 31 opposite to the upper end side connected to the vertical tube connection port 28 of the baffle device 1 is substantially perpendicular to the axial direction of the flat cylindrical tube 31, for example 50 It is bent at an angle of ≧ 85 °. That is, the lower end side of the flat cylindrical tube 31 has an axial direction substantially orthogonal to the axial direction of the upper end side of the flat cylindrical tube 31.

  At this time, the wall surface portion 7 of the manhole 2 is provided with an outflow opening 41 for discharging the sewage flowing from the inflow opening 8 of the manhole 2. The outflow opening 41 is provided at the lower end side of the wall surface portion 7 as well as the position facing the inflow opening 8. The outflow opening 41 penetrates in the thickness direction of the wall surface portion 7 of the manhole 2. Further, an elongated cylindrical outflow pipe 42 that allows the sewage stored in the manhole 2 to flow out is attached to the outflow opening 41. The outflow pipe 42 has a downstream side of the outflow pipe 42 protruding outward from the outer peripheral surface of the wall surface portion 7 of the manhole 2.

  Further, an invert portion 43 inclined downward from the inflow opening 8 of the manhole 2 toward the outflow opening 41 is formed on the bottom surface portion 12 of the manhole 2. The invert portion 43 forms a drainage gradient on the bottom surface portion 12 of the manhole 2 for discharging the sewage flowing from the inflow opening 8 to the outflow opening 41. As a result, since the horizontal cross section of the baffle device 1 that prevents the sewage flowing from the inflow opening 8 of the manhole 2 from being scattered has a substantially flat circular shape, the same effects as the first embodiment can be obtained. Can do.

  Further, the lower end side of the flat cylindrical tube 31 connected to the baffle device 1 is bent toward the outflow opening 41 side of the manhole 2 so that the sewage flowing from the inflow opening 8 of the manhole 2 is efficiently manhole 2. Then, it is guided to the outflow opening 41 through the invert portion 43 and flows out. Therefore, the momentum of the sewage flowing from the inflow pipe 9 of the manhole 2 can be suppressed at the bent portion on the lower end side of the flat cylindrical pipe 31. Therefore, the sewage flowing from the inflow pipe 9 of the manhole 2 does not strike the invert portion 43 of the manhole 2 vigorously, so that erosion of the invert portion 43 can be suppressed.

  Here, as shown in FIG. 6, when the pump 15 is installed in the manhole 2, the pump 15 pumps up the sewage in the manhole 2, so A certain amount of sewage must be stored in the manhole 2. Therefore, in this case, it is not necessary to bend the lower end side of the flat cylindrical tube 31. On the other hand, as shown in FIG. 7, when the baffle device 1 is used as a sub-tube device in a manhole, the sewage strikes directly on the bottom surface portion 12 of the manhole 2, so that the flat cylindrical tube It is necessary to bend the lower end side of 31.

  In the second embodiment, the configuration in which the lower end side of the flat cylindrical tube 31 is bent has been described. However, the downstream side of the flat cylindrical tube 31 is bent in an L shape when viewed from the side. An operation similar to that of the second embodiment can be achieved by attaching an elbow body (not shown) as a bent joint bent in advance to the lower end portion of the flat cylindrical tube 31 and bending the lower end side of the flat cylindrical tube 31. There is an effect.

  Further, the cleaning port 27 of the baffle device 1 may be closed by attaching a lid, or may be opened without attaching the lid to the cleaning port 27. Further, the horizontal cross sections of the baffle device 1 and the flat cylindrical tube 31 are elliptical, but the horizontal cross sections of the baffle device 1 and the flat cylindrical tube 31 are flat circles configured so that each rectangular corner is arcuate. It is good also as a shape.

  Furthermore, the baffle device 1 is attached to a No. 2 manhole 2 large enough to allow an operator to enter the inside, but is a so-called small manhole that is so large that an operator cannot enter the inside. In addition, by attaching the baffle device 1, the same operational effects as those of the above embodiments can be obtained.

It is an explanatory top view showing the installation state of the drainage device of a 1st embodiment of the present invention. It is a longitudinal cross-sectional view which shows a drainage apparatus same as the above. It is a rear view which shows a drainage apparatus same as the above. It is a cross-sectional view which shows a drainage apparatus same as the above. It is explanatory drawing which shows the cross-sectional area of a drainage apparatus same as the above. It is explanatory sectional drawing which shows the installation state of a drainage apparatus same as the above. It is explanatory sectional drawing which shows the installation state of 2nd Embodiment of the drainage device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Baffle device as drainage device 2 Manhole 3 Manhole body 7 Wall surface portion as side surface portion 9 Inflow pipe
21 Main body of baffle
22 Drainage inlet as an inlet
28 Vertical pipe connection port
31 Flat cylindrical tube as connecting tube

Claims (7)

A drainage device attached to a manhole having a substantially cylindrical manhole body and an inflow pipe that is provided on a side surface portion of the manhole body and allows drainage to flow into the manhole body,
In a state where the major axis direction is along the circumferential direction of the manhole body of the manhole, the main body portion having a substantially flat circular cross section attached to the inner surface of the manhole body,
An inlet provided in the main body and connected to the inflow pipe;
A connection port having a substantially flat circular cross section having a major axis direction along the major axis direction of the main body portion that opens toward the lower end side of the manhole main body of the manhole while communicating with the inflow port,
A drainage device comprising: a connecting pipe having an upper end attached to the connection port and having a substantially flat circular cylindrical cross section substantially equal to the connection port. The drainage device according to claim 1, wherein a lower end portion of the connection pipe is curved with respect to an upper end portion of the connection pipe. The drainage device according to claim 1, further comprising a curved joint that is attached to a lower end portion of the connecting pipe and curves the lower end portion of the connecting pipe. The drainage device according to any one of claims 1 to 3, wherein a cross-sectional area perpendicular to the axial direction of the main body is substantially equal to a cross-sectional area perpendicular to the axial direction of the inflow pipe. The drainage device according to any one of claims 1 to 3, wherein a cross-sectional area perpendicular to the axial direction of the main body is smaller than a cross-sectional area perpendicular to the axial direction of the inflow pipe. The drainage device according to any one of claims 1 to 5, wherein the connecting pipe is made of a synthetic resin and is formed by blow molding. The drainage device according to any one of claims 1 to 5, wherein the connecting pipe is made of synthetic resin and is formed by extrusion molding.

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