JP2568845Y2 - Straight wall structure of synthetic resin manhole - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straight wall structure of a synthetic resin manhole to be installed underground.

[0002]

2. Description of the Related Art Conventionally, manholes installed at junctions of sewer pipes and the like are mainly made of concrete, and the thickness of the straight wall of a concrete manhole is considerably thick, and mortar adheres to an end face. Had been buried.

FIG. 6 is a sectional view of a straight wall portion of a concrete manhole for sewage system disclosed in Japanese Utility Model Publication No. 56-77555. A step a is provided on the outer peripheral edge of the end face of the concrete straight wall 2, and the mortar b is filled in the step a and the straight wall 2 is abutted and buried. It has a configuration.

In Japanese Utility Model Laid-Open Publication No. 58-38885, as shown in FIG. 7, an end face of the straight wall is engaged and inserted with an O-ring 6 made of an elastic material interposed in a stepped recess on the end face of the straight wall 2. An arrangement is disclosed.

[0005] In the above-mentioned conventional concrete manhole, the straight wall portion is thick and heavy, so that it is relatively easy to withstand fluctuations in the ground, maintain integrity, and maintain watertightness. .

[0006]

SUMMARY OF THE INVENTION Synthetic resins are excellent in corrosion resistance and have characteristics that they can be easily molded by injection molding, compression molding and the like. Therefore, the use of synthetic resin manholes has been desired. . However, in the case of a synthetic resin manhole in which a plurality of straight walls are stacked to form a straight wall portion, the connection strength of the straight walls is insufficient, and it cannot withstand earthquakes and ground deformations.
Furthermore, the metal jig used for the connection is corroded, the connection is incomplete, and there is a problem that groundwater leaks in.

The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to provide a structure of a straight wall portion of a synthetic resin manhole with improved connection strength and corrosion resistance of the straight wall. It is assumed that.

[0008]

SUMMARY OF THE INVENTION Therefore, the invention according to claim 1 is directed to a synthetic resin manhole having a straight wall joined by engaging a step provided at an end of a straight wall of the synthetic resin manhole. It is a straight wall portion structure, and at the end of the straight wall, a metal insert coated with the same kind of synthetic resin as the straight wall and integrally formed with the straight wall is provided. It is an object of the present invention to achieve the above object by a configuration in which a bolt is penetrated and tightened in a provided hole.

According to a second aspect of the present invention, there is provided a straight wall structure of a synthetic resin manhole in which a straight wall of a synthetic resin manhole is joined to the straight wall with a packing interposed therebetween. Is provided with a metal insert in which a tubular ring portion coated with the same kind of synthetic resin as the straight wall is embedded and integrally formed in the straight wall and a flange portion is projected from the outer peripheral surface of the straight wall. The above object is achieved by a configuration in which a bolt is inserted into a hole provided in a flange portion of an insert and tightened.

[0010]

The straight wall structure of the synthetic resin manhole according to the present invention can be easily joined to a correct position because the step provided at the end of the straight wall to be connected is engaged. The metal insert that is tightened by penetrating the bolt is coated with the same kind of synthetic resin as the straight wall and is integrally formed with the straight wall, so that it can be integrated with the straight wall with sufficient strength. The connection strength between the steel and the straight wall is sufficiently high, and it is not corroded by the coating with a synthetic resin, and has excellent durability.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a structure of a straight wall portion of a plastic manhole according to the invention will be described below.

FIG. 1 is a sectional view of a main part showing the structure of one embodiment.

The feature of this embodiment relates to a structure of a connecting portion of a plurality of straight walls 2a and 2b constituting a plastic straight wall portion 1 from a plastic manhole body (not shown) connected to a drain pipe to the ground.

FIG. 1 is a sectional view of an essential part showing one embodiment.

The straight walls 2a and 2b are formed of a thermoplastic synthetic resin into a cylindrical shape having a diameter of 600 mm and a thickness of 25 mm. Stepped portions 3a and 3b to be engaged are provided at the connecting end, and a steel insert 4 having a bolt insertion hole 4a penetrating the stepped portion 3a is integrally formed on the straight wall 2a. Has a bolt insertion hole 5 penetrating the step 3b.
The steel insert 5 having a in four places is integrally formed.

The packing 6 is placed on the ends of the straight walls 2a and 2b with the packing 6 interposed therebetween, and the bolts 7 are inserted into the bolt insertion holes 4a and 5a.
Are inserted and connected with nuts 8 tightly.

The material of the straight walls 2a and 2b is preferably a thermoplastic synthetic resin such as vinyl chloride resin or polyethylene. As a filler, inorganic substances such as calcium carbonate and mica and industrial wastes such as FRP are crushed and mixed. It is also possible.

The metal inserts 4 and 5 are formed by fusion-coating the same type of thermoplastic synthetic resin as the straight walls 2a and 2b on a 3mm-thick steel plate insert, and then integrally molded with the straight walls 2a and 2b. The bolt 7 and the nut 8 are preferably made of stainless steel, FRP, or the like having excellent corrosion resistance. The packing 6 is preferably a water-swellable rubber obtained by mixing and molding a water-absorbing plastic from the viewpoint of ensuring watertightness.

FIG. 2 shows the metal insert 4 shown in FIG.
It is a perspective view of. Annular ring part 4 of metal insert 4
b is 20% to 2 times higher than the height of the step 3a of the straight wall 2a, and is embedded in the straight wall 2a as shown in FIG. The hole 4c penetrates and has an effect of increasing the degree of adhesion by integral molding with the straight wall 2a. A pipe 4d is connected to the outer peripheral surface of the annular ring portion 4b, and four bolt insertion holes 4a penetrating from the inner peripheral surface to the outer peripheral surface of the annular ring portion 4b are formed.

The metal insert 5 also has a structure similar to that of the metal insert 4, and a pipe 5d is connected to the inner peripheral surface of the annular ring portion, and a bolt insert penetrating from the inner peripheral surface to the outer peripheral surface of the annular ring portion. Holes 5a are formed at four places.

FIG. 3 is a cross-sectional view of a main part of the straight wall showing a different cross-sectional shape of the metal insert 4 formed integrally with the step portion 3a of the straight wall 2a.

In the metal insert 4 shown in FIG. 3, a pipe 4e is attached through the annular ring portion 4b so as to project to the outer peripheral surface and the inner peripheral surface of the annular ring portion 4b.
A bolt insertion hole 4a penetrating from the inner peripheral surface to the outer peripheral surface is formed. Due to this shape, the entire annular ring portion 4b is formed by the straight wall 2
a, the effect of increasing the degree of adhesion by integral molding with the straight wall 2a can be further enhanced.

The metal insert 5 integrally formed on the step 3b of the straight wall 2b is also connected to the inner peripheral surface and the outer peripheral surface of the annular ring by projecting a pipe according to the shape of the metal insert 4. The present invention is embodied by forming a bolt insertion hole 5a penetrating from the inner peripheral surface to the outer peripheral surface of the annular ring portion, inserting a combination bolt 7 with the above-mentioned metal insert and tightening and connecting with a nut 8. Can be.

In each of the above embodiments, the shape of the plurality of resin through holes 4c is not limited to a circular hole, but may be a square hole. The number of the bolt insertion holes 4a and 5a is not limited to four, but may be plural. It is preferable that the bolt insertion holes 4a and 5a have a recess for preventing rotation of the head of the bolt 7.

With the above configuration, the metal inserts 4, 5
Is coated with the same kind of synthetic resin as the straight walls 2a and 2b and is integrally formed with the straight walls 2a and 2b.
2b can be integrated with a sufficient strength, the connection strength between the straight walls is sufficiently high, and it is not corroded by coating with a synthetic resin and has excellent durability.

(Other Embodiment) FIG. 4 is a sectional view of a main part of another embodiment, and FIG. 5 is a perspective view of a metal insert of the embodiment.

The straight walls 2a and 2b are formed of a thermoplastic synthetic resin into a cylindrical shape having a diameter of 600 mm and a wall thickness of 25 mm, similarly to the above embodiment. A metal insert 9 having a thickness of 3 mm and a bolt insertion hole 9a is provided at the end to be connected.
a and 2b are integrally formed.

Then, the packing 6 is placed on the portion connecting the straight wall 2a and the straight wall 2b with the packing 6 interposed therebetween, the bolt 7 is inserted into the bolt insertion hole 9a, and the bolt 8 is tightly connected with the nut 8.

The metal insert 9 of the present embodiment is a straight wall 2
Both a and 2b can be molded by combining the same type.

The annular ring portion 9b of the metal insert 9
Is embedded in the straight walls 2a, 2b as shown in FIG. 4, and a plurality of resin through-holes 9c penetrate through the annular ring portion 9b, and are integrated with the straight walls 2a, 2b. It has the effect of increasing the degree of adhesion in molding. Annular ring part 4b
Is formed with a flange portion 9d which extends outward and protrudes from the outer peripheral surface of the straight walls 2a, 2b.
Are formed with a plurality of bolt insertion holes 9a.

The metal insert 9 is formed by melting and coating the same type of synthetic resin as that of the straight walls 2a and 2b on the insert of the steel plate as in the above embodiment, and then forming the flange 9d from the outer peripheral surface of the straight walls 2a and 2b. It is formed integrally with the straight walls 2a and 2b by protruding. The bolt 7 and the nut 8 are preferably made of stainless steel, FRP, or the like having excellent corrosion resistance. Packing 6
Is preferably a water-swellable rubber obtained by mixing and molding a water-absorbing plastic.

With the above configuration, the same effect as in the above embodiment can be more effectively exerted.

[0033]

As described above, the structure of the straight wall portion of the synthetic resin manhole according to the present invention has a structure in which a bolt is inserted through a metal insert provided at the end of the straight wall to be connected, and the structure is tightened. The metal insert is coated with the same kind of synthetic resin as the straight wall and molded integrally with the straight wall, so it can be integrated with the straight wall with sufficient strength, and the connection strength between the straight wall and the straight wall is sufficient High, and corrosion resistance is high due to coating with synthetic resin, and durability can be exceeded.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a configuration of an embodiment.

FIG. 2 is a perspective view of a metal insert according to one embodiment.

FIG. 3 is a sectional view of a main part of a straight wall on which metal inserts having different shapes are mounted.

FIG. 4 is a sectional view of a main part showing a configuration of another embodiment.

FIG. 5 is a perspective view of a metal insert according to another embodiment.

FIG. 6 is a sectional view of a straight wall portion of a conventional manhole.

FIG. 7 is a sectional view of a straight wall portion of a conventional manhole.

[Explanation of symbols]

 1 Straight wall portion of manhole 2a, 2b Straight wall 3a, 3b Step portion of straight wall 4, 5, 9 Metal insert 4a, 5a Bolt insertion hole 4b, 9b Annular ring portion 4c, 9c Resin through hole 4d, 4e, 5d Pipe 6 Packing 7 Bolt 8 Nut 9d Flange

Claims (2)

(57) [Scope of request for utility model registration] 1. A straight wall structure of a synthetic resin manhole in which a step provided at an end of a straight wall of a synthetic resin manhole is engaged with the straight wall to join the straight wall. Has a metal insert coated with the same type of synthetic resin as the straight wall and integrally molded with the straight wall, and bolts are inserted through holes provided in the metal inserts of both straight walls to be joined and tightened. Wall structure of synthetic resin manhole. 2. A straight wall portion structure of a synthetic resin manhole in which a straight wall of a synthetic resin manhole and a straight wall are joined with a packing interposed therebetween, wherein an end of the straight wall has the same type as the straight wall. A tubular ring portion coated with a synthetic resin is embedded in a straight wall and integrally molded, and a metal insert having a flange portion protruding from the outer peripheral surface of the straight wall is provided on a flange portion of the metal insert of both straight wall portions to be joined. A straight wall structure of a synthetic resin manhole, characterized in that bolts are passed through the holes and tightened.