JP2004332441A - Invert cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an invert cover which can easily shield an invert formed in a bottom of a manhole from the outside world. <P>SOLUTION: The invert cover 11 covers and hermetically seals the invert 1 which forms a channel of a predetermined shape in the bottom of the manhole 5, and therefore the invert 1 is shielded from the outside world. Thus rainwater flowing into the manhole 5 is not led to a sewage disposal plant together with sewage flowing in the invert 1, and therefore a cause of degrading bacteria activities in the sewage disposal plant is removed. Further even if hydrogen sulfide gas is generated from the sewage flowing in the invert 1, an inconvenience of filling of the hydrogen sulfide gas in the manhole 5 is eliminated. Therefore if work that does not require removal of the invert cover 11 is carried out in the manhole 5, checking of the hydrogen sulfide gas is simplified, and the safety of the work in the manhole is easily secured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cover for sealing an invert provided at the bottom of a manhole.
[0002]
[Prior art]
As shown in FIG. 6, an invert 1 is provided at the bottom of the manhole 5 to smoothly guide sewage, rainwater, and the like from the inlets 6 and 7 to the outlet 8. The invert 1 has a channel forming member 2 placed on a concrete bottom slab 3 and a periphery thereof solidified by a mortar layer 4 as shown in the example in the drawing, or a channel shape as an invert is directly formed on the mortar layer 4. (See, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-339441 ([0006], FIG. 6)
[0004]
[Problems to be solved by the invention]
However, the following problems have conventionally occurred inside the manhole 5 in which the invert 1 is formed at the bottom. First, the manhole 5 is covered with a manhole cover. When rain falls, rainwater flows into the inside of the manhole 5 from a gap between the manhole cover 5 and the manhole cover. Then, the rainwater flowing into the manhole 5 is sent to the sewage treatment facility together with the sewage flowing through the invert 1. However, sewage mixed with a large amount of rainwater is one of the causes of reducing the activity of bacteria in sewage treatment facilities.
Further, there is a possibility that hydrogen sulfide gas is generated from sewage flowing through the invert 1 exposed at the bottom of the manhole 5 and accumulates in the manhole 5. Therefore, when an operator enters the manhole 5 at the time of, for example, maintenance work of a sewer pipe, it is essential to first check and remove hydrogen sulfide gas.
The present invention has been made in view of the above problems, and an object of the present invention is to easily shut off an invert formed at the bottom of a manhole from the outside world and prevent the above problem from occurring.
[0005]
[Means for Solving the Problems]
In order to solve the above problem, an invert cover according to claim 1 of the present invention is a cover of an invert that forms a flow path having a predetermined shape at the bottom of a manhole, and covers an upper side of the invert along the flow path. It is characterized by comprising a lid portion, a connecting portion that seals the inflow port and the outflow port opening to the manhole, and a flange portion that is in close contact with the bottom of the manhole.
ADVANTAGE OF THE INVENTION According to this invention, since the invert which forms a flow path of a predetermined shape is covered and hermetically sealed at the bottom part of a manhole, an invert can be shut off from the outside.
[0006]
An invert cover according to a second aspect of the present invention is the invert cover according to the first aspect, further comprising a flange portion that abuts on a flow path surface of the invert.
According to the present invention, when the invert cover is put on the invert, the flange is brought into contact with the flow path surface of the invert, so that the invert cover can be easily positioned.
[0007]
The invert cover according to a third aspect of the present invention is the invert cover according to the second aspect, wherein at least the flange portion is formed of an elastic member, and an overlapping portion between the flange portion and the flow path surface of the invert is provided. In which a retaining latch is formed. According to the present invention, it is possible to easily attach and detach the invert cover by using the retaining latch formed at the overlapping portion between the flange portion and the flow path surface of the invert.
[0008]
An invert cover according to a fourth aspect of the present invention is the invert cover according to the third aspect, which is used together with an invert integrally provided with a structure of the retaining latch.
According to the present invention, by providing the structure of the retaining latch integrally with the invert itself, there is no need to retrofit the structure to the invert, and the man-hours in the manhole during installation of the invert cover can be reduced. Can be.
[0009]
An invert cover according to a fifth aspect of the present invention is the invert cover according to any one of the first to fourth aspects, wherein an elastic seal member is provided on the flange portion.
According to the present invention, the sealing property between the invert cover and the invert can be enhanced by utilizing the elasticity of the elastic seal member provided on the flange portion. Further, by utilizing the elasticity of the elastic sealing member, the utility of the retaining latch can be enhanced, and the invert cover can be securely fixed to the invert.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Here, the same or corresponding parts as in the related art are denoted by the same reference numerals, and detailed description is omitted.
[0011]
FIG. 1 is a partial cross-sectional view showing a state where an invert cover 11 according to an embodiment of the present invention is mounted on the invert 1. The flow path forming member 2 includes a thick mortar layer 2A having a substantially semicircular cross section and a thin fiber reinforced resin layer (FRP layer) 2B covering the inner surface of the mortar layer 2A and the left and right side edges thereof. It has a structure. The left and right side edges of the flow path forming member 2 have stepped shapes 2a and 2b protruding above a horizontal plane passing through the center of the arc-shaped cross section of the flow path forming member 2. The stepped bottom portion 2a is embedded in the mortar layer 4 and is inclined so that the stepped top surface 2b is flush with the inclined upper surface 4a of the mortar layer 4. That is, the stepped top surface 2b of the flow path forming member 2 constitutes a part of the bottom of the manhole.
[0012]
The invert cover 11 is fixed to the flow path forming member 2 so as to form an invert 1 having a circular cross section so that the cover section 11 a having an arc cross section having substantially the same curvature as the flow path forming member 2 and a manhole bottom surface. And a flange portion 11b that comes into close contact with the flange portion. In addition, a flange 11c is provided which comes into contact with the flow path surface 2c of the flow path forming member 2 constituting the invert. Further, an opening 11d (see FIG. 4) into which the locking claw 2d of the flow path forming member 2 is fitted is formed in the flange 11c. Therefore, the flange portion 11c is provided at least in the peripheral portion of the locking claw 2d of the flow path forming member 2.
[0013]
On the other hand, the lid 11a extends above the flow path forming member 2 along the flow path, and the flanges 11b are provided along the entire length of the invert cover 11 along both ends of the lid 11a. Further, both ends in the longitudinal direction of the lid 11 a are in close contact with the side wall of the manhole 5, and constitute a connecting portion for sealing the inflow ports 6, 7 and the outflow port 8 (see FIG. 6) opened in the manhole 5. I have.
An elastic seal member 12 (such as butyl rubber) is fixed to the flange 11b. The elastic seal member 12 is fixed over the entire length of the flange portion 11b, and secures the hermeticity of the invert cover 11 over the entire length of the invert 1. Further, elastic sealing members 12 are also fixed to connecting portions formed at both ends in the longitudinal direction of the invert cover 11 so as to improve the hermeticity between both ends of the invert cover 11 and the inlets 6, 7 and the outlet 8. it can.
[0014]
In addition, the illustrated invert cover 11 is formed integrally with a fiber reinforced resin such as FRP, but is not necessarily limited to this structure. For example, the lid 11a and the flange 11b are formed of mortar or the like. Alternatively, only the flange 11c may be made of an elastic member and fixed to the lid 11a.
[0015]
When the invert cover 11 is attached to the flow path forming member 2, the flange 11 c is brought into contact with the flow path surface 2 c of the flow path forming member 2, and the flow path forming member is guided by the flange 11 c. 2 is aligned. Then, the collar portion 11c is elastically deformed so that the locking claw 2d of the flow path forming member 2 gets over, and the locking claw 2d is fitted and fixed in the opening 11d. As described above, a so-called retaining latch is formed by the opening 11d and the locking claw 2d at the overlapping portion of the flange 11c and the flow path surface 2c of the flow path forming member 2.
When fitting the locking claw 2d into the opening 11d, the elastic seal member 12 fixed to the flange portion 11b is sandwiched between the stepped top surface 2b of the flow path forming member 2 and compressed. . Then, by utilizing the elastic return force of the elastic seal member 12, the sealing between the flange portion 11b and the stepped top surface 2b is sufficiently ensured, and the locking claw 2d fitted into the opening 11d is removed. By pressing against the edge of the opening 11d, the locking claw 2d is prevented from falling off.
On the other hand, when removing the invert cover 11 attached to the flow path forming member 2, the engagement between the locking claw 2 d and the opening 11 d is made by elastically deforming the lid 11 a in a direction of decreasing the radius of curvature. Uncoupling allows easy removal work.
[0016]
According to the invert cover 11 according to the embodiment of the present invention having the above configuration, the following operation and effect can be obtained. First, since the invert 1 forming a flow path of a predetermined shape is covered and sealed at the bottom of the manhole 5 by the invert cover 11, the invert 1 can be shielded from the outside. For this reason, the rainwater flowing into the manhole 5 is not sent to the sewage treatment facility together with the sewage flowing through the invert 1, and it is possible to eliminate one cause of reducing the activity of bacteria in the sewage treatment facility.
Further, even when hydrogen sulfide gas is generated from sewage flowing through the invert 1 exposed at the bottom of the manhole 5, the manhole 5 is not filled with hydrogen sulfide gas. Therefore, when performing an operation that does not require removing the invert cover 11 inside the manhole 5, it is possible to simplify the check of the hydrogen sulfide gas, and it is easy to secure the safety of the operation inside the manhole 5. Become.
[0017]
Also, the flange 11c is provided on the invert cover 11 so as to abut the flow path surface 2c of the invert, so that when the invert cover 11 is put on the flow path forming member 2, the flange 11c is first placed on the flow path of the invert. By contacting the front surface 2c, the invert cover 11 can be easily positioned. Therefore, the work of attaching the invert cover 11 can be facilitated.
In addition, since at least the flange portion 11c of the invert cover 11 is made of an elastic member, and a retaining latch is formed at the overlapping portion between the flange portion 11c and the flow surface 2c of the invert, the invert to the flow path forming member 2 is formed. The attachment / detachment work of the cover 11 can be easily performed.
[0018]
Furthermore, by providing the locking claw 2d, which is the structure of the retaining latch, integrally with the flow path forming member 2 constituting the invert, it is unnecessary to retrofit the locking claw 2d to the flow path forming member 2, It is possible to reduce the number of man-hours in the manhole 5 when constructing the invert cover.
In addition, by providing the elastic seal member 12 on the flange portion 11b, the sealing property between the invert cover 11 and the flow path forming member 2 can be improved by utilizing the elasticity of the elastic seal member 12. In addition, by utilizing the elasticity of the elastic seal member 12, the utility of the retaining latch can be enhanced, and the invert cover 11 can be securely fixed to the invert.
[0019]
As shown in FIG. 2, the locking claw 13, which is the structure of the retaining latch, is formed separately from the flow path forming member 2, and is fixed to the flow path forming member 2 using fixing means such as a self-tapping screw 14. (See FIG. 5), the invert cover 11 can be easily attached to the already-installed conventional invert.
Further, as in an invert cover 11 'shown in FIG. 3, a retaining latch is not provided at a portion where the flange portion 11c and the flow channel surface 2c of the invert are overlapped, and the flange portion 11b is fixed using a fixing means such as a self-tapping screw 15. The channel forming member 2 may be fixed to the stepped top surface 2b. As another application example, in a case where a channel shape as an invert is directly formed on the mortar layer 4 at the bottom of the manhole 5, an invert cover 11 'shown in FIG. The invert cover 11 shown in FIG. 1 and FIG. 2 can be used by fixing using the like or by fixing the locking claw 13 shown in FIG. It becomes possible.
[0020]
In the example shown in FIGS. 1 and 2, the retaining latch is configured by providing the opening 11 d in the flange 11 c of the invert cover 11 and the locking claws 2 d and 13 on the flow path surface 2 c of the flow path forming member 2. However, it is also possible to form a retaining latch by forming a locking claw on the flange portion 11c of the invert cover 11 and a recess into which the locking claw is fitted on the flow path surface 2c of the flow path forming member 2. It is. It is also possible to form a retaining latch by providing locking claws on both the flange portion 11c of the invert cover 11 and the flow path surface 2c of the flow path forming member 2 and fitting the locking claws together. is there.
[0021]
【The invention's effect】
With this configuration, the invert formed at the bottom of the manhole and the outside world can be easily cut off. Then, it is possible to prevent rainwater that has flowed into the manhole from being sent to the sewage treatment facility together with the sewage flowing through the invert, and to eliminate a factor that reduces the activity of bacteria in the sewage treatment facility.
Further, even when hydrogen sulfide gas is generated from sewage flowing through the invert exposed at the bottom of the manhole, it is possible to prevent the manhole from being filled with hydrogen sulfide gas. Therefore, when performing an operation in which it is not necessary to remove the invert cover inside the manhole, it is possible to simplify the check of the hydrogen sulfide gas, and it is easy to ensure the safety of the operation inside the manhole.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a state where an invert cover according to an embodiment of the present invention is mounted on an invert.
FIG. 2 is a partial sectional view showing an application example of FIG.
FIG. 3 is a partial sectional view showing a further application example of FIG. 1;
FIG. 4 is a diagram viewed from the arrow A in FIG. 1;
FIG. 5 is a diagram viewed from an arrow B in FIG. 2;
FIG. 6 is a perspective view showing an invert formed at the bottom of the manhole.
[Explanation of symbols]
1 Invert 2 Flow path forming member 2b Stepped top surface 2c Flow path surface 2d, 13 Engagement claw 4 Mortar layer 5 Manhole 6, 7 Inlet 8 Outflow 11 Invert cover 11a Lid 11b Flange 11c Flange 11d Opening 12 Elastic seal members 14, 15 Self-tapping screw

Claims (5)

A cover of the invert that forms a flow path of a predetermined shape at the bottom of the manhole, a lid that covers the upper side of the invert along the flow path, and a connection part that seals an inlet and an outlet that open to the manhole, An invert cover comprising a flange portion which is in close contact with the bottom of the manhole. The invert cover according to claim 1, further comprising a flange abutting on a surface of the flow path of the invert. 3. The invert cover according to claim 2, wherein at least the flange portion is formed of an elastic member, and a retaining latch is formed at an overlapping portion between the flange portion and the flow path surface of the invert. 4. The invert cover according to claim 3, wherein the invert cover is used together with an invert integrally provided with the retaining latch structure. The invert cover according to any one of claims 1 to 4, wherein an elastic seal member is provided on the flange portion.

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