JPH0346032Y2 - - Google Patents

Description

[Detailed description of the invention] <<Purpose of the invention>><<Industrial application field>> The present invention relates to a cylindrical block used as a manhole, rainwater catchment, sewage catchment, etc.

<<Prior Art>> Conventional cylindrical blocks used as manholes and the like have both inner and outer circumferential surfaces having a circular or elliptical cross-section.

<<Problem to be solved by the invention>> Figures 9 to 11 relate to a conventional cylindrical block 50, and Figure 9 is a cross-sectional view showing the state of connection of the pipes;
FIG. 0 is a longitudinal cross-sectional view of the block, and FIG. 11 is a cross-sectional view of the footrest embedding part. As shown in FIG. 9, the conventional cylindrical block was formed with a circular or elliptical cross section on both the inner and outer circumferences, so the connection with the pipe was made by drilling a slightly larger hole 51 in the side wall and inserting the pipe 56 into the gap. Only the extremely simple method of filling the pipe with mortar 52 could be used, and this connection was a source of water leakage. Regarding the connection of the cylindrical blocks, as shown in FIG. 10, in order to provide both the waterproof packing 54 and the connecting fittings 55 on the end faces, it is necessary to provide an annular bulge 53 in order to increase the area of the end faces. . Footrest fittings 13
Regarding the embedding, the embedding part had to be made thicker to form a reinforcing part 57, as shown in FIG. Such an annular bulging portion 53 and reinforcing portion 57
There was a problem in that the formwork was complicated and the cost was high. The present invention solves the above problems and enables a highly reliable pipe connection structure, eliminates the need for reinforcing the annular bulge at the end and the embedded part of the footrest, and simplifies the formwork. This was done in order to realize the

《Structure of the invention》 《Means for solving the problem》 The present invention has an outer circumferential surface with an octagonal cross section and an inner circumferential surface with a circular or oval cross section, and a waterproof gasket is integrally attached to the end surface along the outer circumference. This is a cylindrical block characterized by having a connecting fitting embedded inside the apex corner of the end face.

《Function》 The outer circumferential surface of the cylindrical block of this invention has an octagonal cross-section, so it is possible to connect the pipe to a flat surface, and it is reliable, such as by installing a waterproof gasket or embedding a connecting fitting for bolt tightening. This enables highly flexible pipe connections. In addition, because the inner peripheral surface is formed in a circular or oval cross section, the wall is thick near the apex corner (the part corresponding to the apex angle of the octagon on the outer periphery), and the area of the end face is also increased in this area. By providing the connecting fitting here, both the connecting fitting and the waterproof packing can be provided without forming an annular bulge. If the footrest hardware is also embedded in the above-mentioned thick part, the reinforcing part becomes unnecessary.

《Example》 Figures 1 to 7 relate to an example of the present invention.
The figure is a top view of the cylindrical block 1, Figure 2 is a bottom view, Figure 3 is a side view showing the right half of the manhole in its assembled state, and Figure 4 is a pipe connected to the cylindrical block 2. 5 is an enlarged view of the main part in FIG. 4, FIG. 6 is a cross sectional view showing another example of pipe connection, and FIG. 7 is a section showing the connected state of the cylindrical block 1. The sectional view, FIG. 8, is a top view of the cylindrical block 42.

The cylindrical block 1 has an outer peripheral surface with a regular octagonal cross section and an inner peripheral surface with a circular cross section, as shown in FIG.
The upper end surface 4 has an octagonal protrusion 5 along the outer periphery.
However, recesses 6 are formed at four locations inside the apex corner, and an anchor nut 7 is embedded approximately in the center of the recess 6. As shown in FIG. 2, an octagonal groove 9 is formed along the outer periphery of the lower end surface 8, and a waterproof packing 10 is integrally formed in the groove 9, that is, a portion of the groove 9 is embedded in concrete in cross section. A portion thereof is provided in a state of protruding into the air, and connecting fittings 11 are embedded at four locations inside the apex corner portion so as to protrude slightly from the end surface. Further, as shown in FIG. 3, a circumferential groove 16 is formed on the outer peripheral surface of the block to prevent the block from sinking.

The cylindrical block 2 is provided with a structure for connecting pipes. As shown in FIG. 3 or FIG. 5, a hole 21 with a diameter approximately equal to the inner diameter of the pipe connected to the flat part of the outer circumferential surface, that is, the flat surface corresponding to the sides of the octagon, is bored, and a step is formed on the outer periphery of the hole 21. A depressed portion 22 consisting of a portion 22a and a groove portion 22b is provided, and around the depressed portion 22, anchor nuts 24 are provided at two locations on the left and right.
is buried therein, and a waterproof packing 23 is integrally provided in the groove portion 22b.

The cylindrical blocks 1 and 2 are assembled together with the uppermost block 3, as shown in FIG. 3, for example, and used as a manhole.

As shown in FIG. 7, the connecting part of the cylindrical block 1 is such that the connecting fitting 11 corresponds to the recess 6 and the anchor nut 7, the groove 9 corresponds to the protrusion 5, and the connecting notch 14 corresponds to the connecting part 1.
This is done by screwing the bolt 15 into the anchor nut 7. The protrusion 5 compresses the waterproof packing 10 to produce a waterproof effect. The reason why the connecting fittings were made to protrude slightly from one end face and a recess was formed on the other end face was to facilitate the alignment of the bolt holes.

The connection of the tubes to the cylindrical block 2 is shown in FIG. A protrusion 29 is provided at the connecting end of the tube 25 corresponding to the recessed part 22 of the block 2, and a protrusion 30 is provided at the tip thereof corresponding to the groove 22b. A connecting fitting 27 corresponding to the anchor nut 24 is embedded on the outside of the protrusion 29. The pipes are connected by screwing a bolt 28 into the anchor nut 24 through the connection notch 26. The protruding portion 30 compresses the waterproof packing 23 to create a waterproof effect. To connect the pipes, as shown in FIG. 6, there is also a method in which anchor nuts 31 are embedded in the pipes and bolts are tightened using angles 32.

The connection direction of the pipe is 180° as shown in Figure 4.
(25), 135° (38, 39), 90° (40, 41)
The left and right directions are arbitrary, and inverts are formed as shown in 33 to 37 in each case.

The cylindrical block 42 shown in FIG. 8 has a shape similar to that of the cylindrical block 1 that has been extended laterally, and its inner circumferential surface is formed into an elliptical cross section. This kind of thing is used depending on the conditions of the site where the manhole is installed.

《Effects of the invention》 The outer peripheral surface of the cylindrical block of this invention has an octagonal cross-section, so it is possible to connect the pipe to a flat surface, and it is possible to attach a waterproof gasket or embed metal fittings to tighten bolts. Highly reliable pipe connections are possible. The pipe connection method can be selected from 180°, 135°, or 90°. In addition, because the inner peripheral surface is formed in a circular or oval cross section, the wall is thick near the apex corner (the part corresponding to the apex angle of the octagon on the outer periphery), and the area of the end face is also increased in this area. By providing the connecting fitting here, both the connecting fitting and the waterproof packing can be provided without forming an annular bulge. If you embed the footrest hardware in the thick part mentioned above, the reinforcement part will be unnecessary.
Cost reduction is achieved by simplifying the formwork.

[Brief explanation of the drawing]

Figures 1 to 8 relate to embodiments of the present invention.
The figure is a top view of the cylindrical block 1, Figure 2 is a bottom view, Figure 3 is a side view showing the right half of the manhole in its assembled state, and Figure 4 is a pipe connected to the cylindrical block 2. 5 is an enlarged view of the main part in FIG. 4, FIG. 6 is a cross sectional view showing another example of pipe connection, and FIG. 7 is a section showing the connected state of the cylindrical block 1. The sectional view, FIG. 8, is a top view of the cylindrical block 42. 9 to 11 relate to a conventional cylindrical block 50, FIG. 9 is a cross-sectional view showing the connection state of the pipes, FIG. 10 is a vertical cross-sectional view of the block, and FIG. 11 is a cross-sectional view of the footrest embedded part. It is a diagram. DESCRIPTION OF SYMBOLS 1, 2... Cylindrical block, 3... Uppermost cylindrical block, 4... Upper end surface, 5... Projection, 6... Recess, 7... Anchor nut, 8... Lower end surface, 9...
... Groove, 10 ... Waterproof gasket, 11 ... Connection fitting, 12 ... Bolt hole, 13 ... Footrest hardware, 1
4... Connection notch, 15... Bolt, 16...
Peripheral groove, 20... Flat surface, 21... Hole, 22... Recessed portion, 23... Waterproof packing, 24... Anchor nut, 25... Pipe, 26 Connection notch, 27...
...Connection fittings, 28...Bolts, 29...Protrusions,
30... Protrusion portion, 31... Anchor nut, 32
...Angle, 33, 34, 35, 36, 37...
...invert, 38, 39, 40, 41...tube,
42... Cylindrical block, 50... Cylindrical block,
51... hole, 52... mortar, 53... annular bulge, 54... waterproof packing, 55... connecting fitting, 56... pipe, 57... reinforcing part.

Claims (1)

[Scope of utility model registration request] It has an outer circumferential surface with an octagonal cross section and an inner circumferential surface with a circular or oval cross section, a waterproof packing is integrally provided along the outer circumference on the end surface, and a connecting fitting is embedded inside the apex corner of the end surface. A cylindrical block featuring