JPH0715878Y2 - Manhole invert block - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention relates to an invert block attached to the bottom of a manhole.

[0002]

2. Description of the Related Art Below a sewage manhole, there is a portion called an invert in which a groove through which water flows is formed. Conventionally, this part was made by casting concrete in situ after connecting a sewer pipe to the manhole body. Further, the groove was formed by a skilled worker using a trowel, and it took a lot of time and cost to manufacture it.

[0003]

[Problems to be solved by the device]
Invert is manufactured in advance as a concrete block at the factory and attached to the manhole on site,
The purpose is to facilitate the construction.

[0004]

SUMMARY OF THE INVENTION The manhole invert block of the present invention is a pair of concrete blocks that are sized so that they fit together in the body of the manhole. A hole having a conical cross section is formed in each block, and a screw cylinder is embedded under the hole. Insert the hollow conical bodies formed on both ends of the combined body for connecting both blocks into the holes, insert the bolts into each hollow cylindrical body, and screw the tip of the hollow cylinder into the screw cylinder to both blocks. To join.

A screw hole may be provided in the bolt in the axial direction, and the bolt may be screwed into the screw hole to project from the lower surface of the block to form a pedestal.

[0006]

EXAMPLES Examples will be described with reference to the drawings.
A longitudinal sectional view of the manhole is shown in FIG. 1, and a sectional view of the main part is shown in FIG. Reference numeral 1 is a manhole frame, reference numeral 2 is a bottom plate, reference numeral 3
Is a sewer pipe, and reference numeral 4 is an invert block.

As shown in FIG. 3, the invert block 4
Is a semicircular concrete block, and the two are formed so that they fit together in the body 1 by being combined. A groove 5 having a semicircular cross section is formed on the upper surface of the block 4, and both sides of the groove are inclined. Block 4 and seam 6 of block 4 are grooves 5
And make a right angle. A notch 7 is provided at the end of each block.

The pair of blocks 4 are connected by two connecting bodies 10. As shown in FIG. 4, the joint body 10 has a spectacles-like shape and has hollow conical bodies 11 at both ends, and the joint body 10 is entirely made of cast metal.

Each block 4 is formed with a recess 13 for embedding the combined body 10, and a conical hole 14 that fits the cone 11 is formed in the bottom of the recess. And
In each block, a screw cylinder 15 is embedded in advance under the hole 14 (FIG. 5).

When the construction is carried out, first, two invert blocks 4 made in advance are suspended in the frame 1 and abutted against each other. Next, the conical body 11 of the combined body 10 is inserted into the conical hole 14 of the block, the tightening bolt 20 is passed through the conical body 11, and the tip thereof is screwed into the screw cylinder 15 to be tightened. In this way, the conical body 11 of the combined body bites into the conical hole 14 of the block, so that the two blocks 4
Do not disagree and are tightly coupled.

The tightening bolt 20 is hollow and has a screw hole 20a.
Are formed in the axial direction. Another bolt 2 for this screw hole
1 is screwed, and the tip is projected from the lower surface of the block 4 to form a pedestal 22. By changing the length of the pedestal, the height of the invert block 4 is adjusted and the levels of the groove 5 and the sewer pipe 3 are matched.

Finally, concrete is poured from the notch 7 to fill the space 23 between the block 4 and the bottom plate 2 with concrete. The recess 13 is also filled with concrete.

[0013]

EFFECT OF THE INVENTION The invert block of this invention is not divided into two parts but is divided into two parts, so that it can be carried into the body after installation, which facilitates the construction work. Also,
Since the conical body of the coupling body is fitted into the conical hole of the block, there is an effect that both blocks are not displaced in the front-rear direction, the left-right direction, and the up-down direction and can be firmly coupled.

The height of the invert block can be easily adjusted by forming a screw hole in the tightening bolt, screwing the bolt into the hole, and projecting the tip from the lower surface of the block into a pedestal.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a manhole.

FIG. 2 is a lateral cross-sectional view of a main part of a manhole.

FIG. 3 is a plan view of an invert block.

FIG. 4 is a perspective view of a combined body.

5 is an enlarged cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Manhole frame 4 Invert block 10 Combined body 11 Conical body 14 Hole 20 Tightening bolt 20a Screw hole 21 Bolt 22 Pillar

Claims (2)

[Scope of utility model registration request] 1. A manhole frame (1) comprising two pieces
A pair of concrete blocks sized to fit snugly within, each block having a conical section hole (14)
And a hollow cylinder (11) formed at both ends of a combined body (10) for connecting both blocks is inserted into the hole. A manhole invert block in which a tightening bolt (20) is inserted into each hollow cone and the tip of the bolt is screwed into the screw cylinder to connect both blocks. 2. The tightening bolt is provided with a screw hole (20a) in the axial direction, the bolt 21 is screwed into the screw hole, and the tip is projected from the lower surface of the block to form a pedestal (22).
The manhole invert block according to claim 1.