JPH0589535U - Manhole invert block - Google Patents

Abstract

(57) [Summary] [Purpose] The manhole invert is manufactured as a block in advance at the factory and attached to the manhole on site to facilitate the construction. [Structure] The main body 11 of the invert block 4 is a circular disc made of concrete, and a groove 12 having a semicircular cross section is formed on the upper surface thereof. The block body 11 has four screw holes 14. And the leg 15 which has a male screw on the outer peripheral surface is screwed into each screw hole. A slot is formed at the upper end of the leg 15, and the tip of a tool is engaged with this to turn the leg so that the length of the leg can be adjusted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to an invert block attached to the bottom of a manhole.

[0002]

[Prior Art]

 Below the sewage manhole, there is a part called an invert that forms a groove through which water flows. Conventionally, this part was constructed by casting concrete in-situ after connecting the sewer pipe to the manhole body. The groove is formed by a skilled worker using a trowel, which requires a lot of time and cost for manufacturing.

[0003]

[Problems to be solved by the device]

 Therefore, the present invention aims at facilitating the construction by manufacturing the invert as a block in advance at the factory and attaching it to the manhole on site.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the invert block of the present invention is a concrete block whose main body has a groove having a semicircular cross section connected to a pipe connected to a manhole.

The planar shape of the block can take various shapes such as a circular shape and a rectangular shape, depending on the sectional shape of the manhole. Further, the shape of the groove viewed from above can take various shapes such as L-shape, Y-shape, and cross-shape depending on the number of sewer pipes connected to the manhole and the angle formed by the pipes.

The invert block body has a screw hole passing through it. A leg having a male screw on the outer peripheral surface is screwed into the screw hole, and the leg can be rotated from above the main body to adjust the effective length of the leg.

[0007]

[Action]

 Insert the invert block in the lower part of the manhole, and after connecting the pipe (sewer pipe) to the manhole, rotate the legs from above the invert block to lengthen the legs and adjust the groove to the same level as the inner surface of the pipe. To do. After that, the space around the inner wall of the manhole and the invert block is filled with cement mortar.

[0008]

【Example】

 An embodiment will be described with reference to the drawings. FIG. 1 is a sectional view of a manhole. Reference numeral 1 is a manhole body, reference numeral 2 is a bottom plate, reference numeral 3 is a sewer pipe, and reference numeral 4 is an invert block.

As can be seen from FIGS. 2 and 3, the main body 11 of the invert block 4 is a disk made of concrete. A groove 12 having a semicircular cross section is formed on the upper surface of the main body, and both sides of the groove are inclined toward the groove. The block body 11 has four screw holes 14. And the leg 15 which has a male screw on the outer peripheral surface is screwed into each screw hole.

As shown in FIG. 4, the screw hole 14 is formed by embedding a polyethylene pipe 17 having a spiral groove inside when the block is molded, and the screw groove of the polyethylene pipe becomes a female screw of the screw hole. ing. The legs 15 are also made by filling concrete of the same type of pipe 18 (the diameter is small and small), and in this case, the spiral groove of the polyethylene pipe is a female thread.

A slot 19 is formed at the upper end of the leg 15, and the tip of a tool is engaged with the slot 19 to rotate the leg so that the length of the leg can be adjusted. Instead of the slot, a bolt may be embedded in the leg 15 so that the head of the bolt projects from the upper end of the leg. The part where the screw hole 14 is open is slightly recessed, and a hole 22 for attaching an eyebolt is formed in this recess 21 (FIG. 3). Install the eyebolts when moving the invert block.

At the time of construction, the sewer pipe 3 is connected to the manhole body 1 with the invert block 4 inserted therein. At this time, as shown by the chain line in FIG. 2, the legs 15 are shortened and the invert block 4 is lowered so that it does not interfere with the attachment of the sewer pipe. After connecting the sewer pipe, insert the tip of the tool into the slot 19 and turn the leg 15 to lengthen the leg so that the groove 12 is aligned with the inner surface of the sewer pipe 3 and the height of the invert block body 11 is increased. Adjust.

Finally, the gap between the invert block 4 and the manhole 1 is filled with mortar or the like (the filling portion is shown by reference numeral 23), and the recess 21 is also filled with mortar.

[0014]

[Effect of the device]

 The invert block of this invention can be manufactured at a factory in advance and installed on site, so the construction cost is low. Also, since you can change the length of the legs by turning the legs from the top of the main unit, shorten the legs and lower the invert block so that it does not interfere with work when connecting the pipe, and after connecting, lengthen the legs. The effect is that the groove can be easily adjusted so that it is level with the inner wall of the pipe.

[Brief description of drawings]

FIG. 1 is a sectional view of a manhole.

FIG. 2 is a cross-sectional view of an invert block.

FIG. 3 is a plan view of the same.

FIG. 4 is an enlarged cross-sectional view of a leg connecting portion.

[Explanation of symbols]

 1 Manhole 3 Sewage pipe 11 Block body 14 Screw hole 15 Legs

Claims (1)

[Scope of utility model registration request] 1. A block main body having a groove having a semicircular cross section continuous with a pipe connected to a manhole and having a screw hole penetrating therethrough, and the screw main body is screwed into the screw hole. An invert block for a manhole, comprising a plurality of legs having male threads on the outer peripheral surface thereof, and enabling the effective length of the legs to be adjusted by turning the legs from above the main body.