JP2015055078A - Invert - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an invert for improving working efficiency in a manhole, even when an outer diameter of an invert cover is large.SOLUTION: This invert 1a is provided with an invert cover 3 so as to block up a flow passage forming member 2 provided in a bottom part of a manhole 20, and comprises work stairs 4 in the direction for crossing the invert cover 3 along an outer surface of the invert cover 3. Thus, even when the outer diameter of the invert cover 3 is large, an operator can easily move so as to cross an upper surface of the invert cover 3 by using the work stairs 4, and the working efficiency in the manhole 20 can be improved.

Description

  The present invention relates to an invert provided at the bottom of a manhole.

An invert is provided at the bottom of the manhole to smoothly guide sewage, rainwater, etc. from the inlet to the outlet. In recent inverts, a groove-like channel provided at the bottom of a manhole is covered with an invert cover, and the inside of the groove-like channel and the outside are blocked by the invert cover (see Patent Document 1). .
However, when the worker moves in the manhole, such as when maintaining the sewer pipe, it is necessary to move so as to cross the upper surface of the invert cover. In particular, when the outer diameter of the invert cover is large (for example, invert When the cover has an outer diameter of 100 cm or more), when moving so as to cross the upper surface of the invert cover, the movement is not easy and the working efficiency is very poor.

Japanese Patent No. 4239156

  As described above, when the worker moves in the manhole so as to cross the upper surface of the invert cover, particularly when the outer diameter of the invert cover is large, the movement becomes difficult and there is a concern that the work efficiency is lowered. It was.

  The present invention has been made in view of this point, and an object of the present invention is to provide an invert that improves the working efficiency in the manhole even when the outer diameter of the invert cover is large.

As a means for solving the above-mentioned problems, the present invention provides an invert for forming a channel having a predetermined shape in the bottom of a manhole, wherein the invert is provided at the bottom of the manhole. An invert cover provided so as to close the groove-shaped flow path, and a working staircase provided in a direction crossing the invert cover along the outer surface of the invert cover. .
According to the first aspect of the present invention, even when the outer diameter of the invert cover is large, the operator can easily cross the upper surface of the invert cover by using the work steps provided along the outer surface of the invert cover. It can move and work efficiency can be improved.

The invention described in claim 2 is characterized in that, in the invention described in claim 1, the work staircase is integrally formed on an outer surface of the invert cover.
In invention of Claim 2, the handling at the time of construction becomes easy.

The invention described in claim 3 is characterized in that, in the invention described in claim 1, the working staircase is formed in an arch shape so as to cover the entire radial direction of the invert cover from above. is there.
In the invention of claim 3, the operator can easily cross the upper surface of the invert cover by using the arched work steps arranged in the radial direction so as to cover the outer surface of the invert cover. It can move and work efficiency can be improved.

  According to the invert invention of the present invention, even when the outer diameter of the invert cover is large, the operator crosses the upper surface of the invert cover by using the work steps provided along the outer surface of the invert cover. Can be moved easily. Thereby, the movement in a manhole becomes easy and work efficiency can be improved.

FIG. 1 is a sectional view of an invert according to the first embodiment of the present invention. FIG. 2 is a sectional view of an invert according to the second embodiment of the present invention. FIGS. 3A and 3B are diagrams showing a staircase member configured in an invert according to the second embodiment, wherein FIG. 3A is a plan view and FIG. 3B is a cross-sectional view.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS.
First, the invert 1a according to the first embodiment will be described in detail with reference to FIG.
As shown in FIG. 1, the invert 1 a according to the first embodiment is provided in the upper part so as to close the flow path forming member 2 provided at the bottom of the manhole 20 and the flow path forming member 2. An invert cover 3 is provided.

  As shown in FIG. 1, the flow path forming member 2 is placed on the surface of a substantially semicircular groove formed in the bottom plate 8 of the manhole 20, and the periphery thereof is fixed by a mortar layer 5. It is. The flow path forming member 2 corresponds to a groove-shaped flow path provided at the bottom of the manhole 20. The flow path forming member 2 includes a thick mortar layer 2A extending in a substantially semicircular shape in a cross-sectional view, and a thin fiber reinforced resin layer (FRP layer) 2B covering the inner surface of the mortar layer 2A and its left and right side edges. And a two-layer structure. Further, the left and right side edge portions of the flow path forming member 2 are formed in stepped shapes 6 and 7 projecting upward from a horizontal plane passing through the center of the arc-shaped cross section of the flow path forming member 2. The step-shaped bottom portion 6 is embedded in the mortar layer 5 and is inclined so that the step-shaped top surface 7 is flush with the inclined upper surface 5 a of the mortar layer 5.

  The invert cover 3 is fixed to the flow path forming member 2 so as to form a cylindrical invert 1a. The lid 3a extends in a substantially semicircular cross section having substantially the same curvature as the flow path forming member 2. Flange portions 3b and 3b that are in close contact with the bottom surface (inclined upper surface 5a) of the manhole 20 via the elastic seal members 10 and 10 and the inner surface of the fiber reinforced resin layer 2B of the flow path forming member 2 (surface of the groove-shaped flow path) It is formed integrally from the flanges 3c and 3c that come into contact.

  The lid 3a extends above the flow path forming member 2 along the flow path. A work staircase 4 extending in a direction crossing the invert cover 3 is integrally provided on the outer peripheral surface of the lid portion 3a. The working staircase 4 includes a first working staircase portion 13 having a plurality of staircase portions continuous in a direction crossing the invert cover 3 and a plurality of staircase portions continuous in a direction crossing the invert cover 3. The second work staircase portion 14 is composed of a flat portion 15 that connects the upper end of the first work staircase portion 13 and the upper end of the second work staircase portion 14. The work staircase 4 may be formed over the entire length of the lid portion 3a, or the work staircase 4 may be formed with a predetermined width, and a plurality of work staircases 4 may be formed at intervals along the longitudinal direction of the lid portion 3a. Also good. When the work stairs 4 are configured with a predetermined width, worker handrails may be installed on both sides in the width direction of the work stairs 4. The height of each staircase portion of the first work staircase portion 13 and the second work staircase portion 14 is set to an appropriate height that allows an operator to get on and off. Both ends in the longitudinal direction of the lid portion 3a are configured to be in close contact with the inner wall surface of the manhole 20 and to seal the inlet (not shown) and the outlet (not shown) that open to the manhole 20 by the configuration described later. Yes.

  Moreover, the flange parts 3b and 3b are provided over the full length of the flow-path formation member 2 along the both ends of the cover part 3a. An elastic seal member 10 (for example, butyl rubber or the like) is fixed to each flange portion 3b, 3b. These elastic seal members 10 and 10 are fixed over the entire length of the flange portions 3b and 3b. These elastic seal members 10 and 10 ensure the sealing performance between the flow path forming member 2 and the invert cover 3 over the entire length of the invert 1a. Further, the elastic seal members 10 and 10 are fixed to both ends in the longitudinal direction of the lid portion 3a of the invert cover 3, respectively, and the longitudinal ends of the lid portion 3a of the invert cover 3 are sealed with the inlet and the outlet. I try to increase the sex. Furthermore, each hook 3c is formed with an opening 3d through which the locking claw 11 (separate from the flow path forming member 2) is inserted. A plurality of openings 3 d are formed at intervals along the longitudinal direction of the invert cover 3. The locking claw 11 has a thickness that is sufficiently larger than the thickness of the flange portion 3 c of the invert cover 3.

  When attaching the above-described invert cover 3 to the flow path forming member 2, the flange portions 3c, 3c of the invert cover 3 are brought into contact with the inner surface of the fiber reinforced resin layer 2B of the flow path forming member 2, respectively. The invert cover 3 is positioned with respect to the flow path forming member 2 using the flange portions 3c and 3c as a guide. Then, the locking claws 11 are respectively inserted into the openings 3d provided in the flange portions 3c and 3c of the invert cover 3, and the locking claws 11 are fixed to the flow path forming member 2 by using self-tapping screws 12 or the like. To. When each locking claw 11 is fixed to the flow path forming member 2, the invert cover 3 is attached to the flow path forming member 2, and the elastic seal members 10 and 10 fixed to the flange portions 3b and 3b are the flow path forming members. 2 between the stepped top surfaces 7 and 7 and compressed to ensure sufficient sealing between each flange portion 3b and each stepped top surface 7 of the flow path forming member 2. Will be able to.

  According to the invert 1a according to the first embodiment of the present invention described above, the first work staircase portion 13, the flat portion 15 and the first work staircase 4 are integrally formed on the outer peripheral surface of the invert cover 3 as the work staircase 4. 2 Since the work staircase portion 14 is formed, even when the outer diameter of the invert cover 3 is large (for example, when the outer diameter is 100 cm or more), the operator uses the work staircase 4 to 3 can easily move so as to cross the upper surface of 3, the movement in the manhole 20 is facilitated, and the working efficiency in the manhole 20 is improved.

Next, the invert 1b according to the second embodiment of the present invention will be described in detail based on FIG. 2 and FIG. When describing the invert 1b according to the second embodiment, only differences from the invert 1a according to the first embodiment will be described.
The lid 3 a of the invert cover 3 is formed in a substantially semicircular cross section over the entire length of the flow path forming member 2. Above the lid portion 3a of the invert cover 3, a working step 4 is fixed so as to cover the entire radial direction of the lid portion 3a. The working staircase 4 is made of synthetic resin. The work staircase 4 has a predetermined thickness as a whole, extends in a direction crossing the invert cover 3 (lid portion 3a), and is formed in an arch shape so as to cover the entire radial direction of the invert cover 3. That is, the work staircase 4 includes a plurality of staircase portions that are continuous in a direction crossing the invert cover 3, and the first work staircase portion 13 that extends obliquely upward along the outer peripheral surface of the invert cover 3 and the invert cover 3. , A second work staircase portion 14 that extends obliquely upward along the outer peripheral surface of the invert cover 3, and an upper end of the first work staircase portion 13 and a second work staircase. The flat portion 15 is connected to the upper end of the portion 14. Fixing portions 13a and 14a fixed to the flange portions 3a and 3a of the invert cover 3 are formed at the lower end of the first working staircase portion 13 and the lower end of the second working staircase portion 14, respectively. A plurality of attachment holes 19 through which the attachment bolts 17 are inserted are formed in each of the fixing portions 13a and 14a. The height of the first work staircase portion 13 and the second work staircase portion 14 is set to be equivalent to the radius of the invert cover 3. The width W of the work staircase 4 is set to an appropriate length so that the worker can get on and off.

Then, the invert cover 3 and the work steps 4 are respectively attached to the flow path forming member 2. First, the invert cover 3 is attached to the flow path forming member 2, but since the attachment method is the same as that of the first embodiment, the description thereof is omitted here.
Next, the work staircase 4 is attached to the invert cover 3. The arched work staircase 4 is disposed so as to cover the entire radial direction of the invert cover 3. Then, the fixing portion 13a of the first working staircase portion 13 of the working staircase 4 and one flange portion 3b of the invert cover 3 are overlapped, and the fixing portion 14a of the second working staircase portion 14 and the invert cover 3 are The other flange portion 3b is overlapped and fixed with each mounting bolt 17 or the like. Accordingly, the work staircase 4 is fixed to the invert cover 3 so that the lower surface of the flat portion 15 is close to the top of the invert cover 3, and the first work staircase portion 13 of the work staircase 4, the flat portion 15 and the second work staircase portion 14 are arranged along the radial direction of the outer peripheral surface of the invert cover 3.

  And also in the invert 1b which concerns on the 2nd Embodiment of this invention, since the arch-shaped work step 4 is arrange | positioned so that the outer peripheral surface of the invert cover 3 may be covered from upper direction along radial direction, an invert cover Even when the outer diameter of 3 is large, the operator can easily move so as to cross the upper surface of the invert cover 3 by using the work staircase 4 and can easily move within the manhole 20. The working efficiency within 20 is improved.

  In the invert 1b according to the second embodiment, similarly to the invert 1a according to the first embodiment, handrails for workers may be installed on both sides in the width direction of the work stairs 4. Further, an iron plate or the like having a substantially semicircular cross section may be fixed as a reinforcing member between the lid portion 3a of the invert cover 3 and the working steps 4.

  Further, in the present embodiment, the flow path forming member 2 is provided at the bottom of the manhole 20, but a groove-shaped flow path in which the mortar layer 5 is directly placed on the bottom of the manhole 20 may be formed.

  DESCRIPTION OF SYMBOLS 1a, 1b Invert, 2 Channel formation member (groove-shaped channel), 3 Invert cover, 3a Cover part, 4 Work staircase, 13 1st work staircase part, 14 2nd work staircase part, 15 Flat part , 20 Manhole

Claims (3)

An invert that forms a channel with a predetermined shape at the bottom of the manhole,
The invert
An invert cover provided to close the groove-like flow path provided at the bottom of the manhole;
A working staircase provided along the outer surface of the invert cover in a direction transverse to the invert cover;
Invert characterized by comprising.   The invert according to claim 1, wherein the working staircase is integrally formed on an outer surface of the invert cover.   The invert according to claim 1, wherein the work staircase is formed in an arch shape so as to cover the entire radial direction of the invert cover from above.

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