JPH072590U - Straight wall structure of synthetic resin manhole - Google Patents

Abstract

(57) [Abstract] [Purpose] A synthetic resin manhole straight wall structure with improved connection strength and corrosion resistance. [Structure] The straight walls 2a, 2 are formed by engaging step portions 3a, 3b provided at the ends of the straight walls 2a, 2b of a synthetic resin manhole.
b is a synthetic resin manhole straight wall structure, in which the ends of the straight walls 2a and 2b are coated with the same kind of synthetic resin as the straight walls 2a and 2b, and are integrally molded with the straight walls 2a and 2b. Double walls 2 with inserts 4 and 5 to be joined
A straight wall structure of a synthetic resin manhole in which a bolt 7 is inserted into bolt insertion holes 4a and 5a provided in a and 2b metal inserts 4 and 5 and tightly connected with a nut 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to the structure of a straight wall of a synthetic resin manhole installed in the ground.

[0002]

[Prior art]

 Conventionally, the manholes installed at the relay points of sewer pipes have been mainly made of concrete.The concrete manholes have a fairly thick straight wall, and mortar is attached to the end faces to bury them together. Was.

FIG. 6 is a cross-sectional view of the straight wall portion of the concrete manhole for sewer disclosed in Japanese Utility Model Publication No. 56-77555. By providing a step a on the outer peripheral edge of the end surface of the straight wall 2 made of concrete and filling the step a with mortar b and burying the straight wall 2 in abutment, the intrusion of groundwater can be almost completely prevented. It is composed.

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

In the conventional concrete manhole described above, since the wall thickness of the straight wall is large and the weight is heavy, it is relatively easy to withstand the fluctuation of the ground, maintain the integrity, and maintain the watertightness. is there.

[0006]

[Problems to be solved by the device]

 Since synthetic resins have excellent corrosion resistance and can be easily molded by injection molding, compression molding, etc., the adoption of synthetic resin manholes is being demanded. However, in the synthetic resin manhole in which a number of straight walls are stacked to form a straight wall, the strength of the straight wall connection is insufficient, and it cannot withstand earthquakes and ground movements, and the metal jig used for the connection is corroded. However, there are problems such as incomplete connection and leakage of groundwater.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object thereof is to provide a straight wall structure of a synthetic resin manhole with improved connection strength and corrosion resistance of the straight wall. It is a target.

[0008]

[Means for Solving the Problems]

 Therefore, the invention according to claim 1 is a straight wall portion structure of a synthetic resin manhole in which a step portion provided at an end portion of the straight wall of the synthetic resin manhole is engaged to join the straight walls. The ends of the straight walls are equipped with metal inserts which are coated with the same kind of synthetic resin as the straight walls and are integrally formed with the straight walls, and bolts are inserted into the holes provided in the metal inserts of both straight walls to be joined. The above-mentioned object is achieved by the constitution characterized by being tightly connected.

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 and a straight wall of a synthetic resin manhole are joined through a packing, and an end portion of the straight wall is provided. Is equipped with a metal insert in which a tubular ring part coated with the same kind of synthetic resin as the straight wall is embedded in the straight wall and the flange is projected from the outer peripheral surface of the straight wall. It is an object of the present invention to achieve the above-mentioned object by a structure characterized in that a bolt is passed through and tightly connected to a hole provided in a flange portion of the metal insert.

[0010]

[Action]

 In the structure of the straight wall portion of the synthetic resin manhole according to the present invention, since the step portion provided at the end portion of the straight wall to be connected is engaged, it can be easily joined to the correct position. The metal insert, which is tightened through the bolt, is coated with the same kind of synthetic resin as the straight wall and is molded integrally with the straight wall, so it can be integrated with the straight wall with sufficient strength. The strength of the connection between the wall and the straight wall is sufficiently high, and the coating with synthetic resin does not corrode, and it has excellent durability.

[0011]

【Example】

 Hereinafter, an embodiment of a straight wall structure of a plastic manhole according to the present invention will be described.

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

The feature of the present embodiment relates to the 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 wall thickness of 25 mm. Engaging step portions 3a and 3b are provided at the connecting ends, and a steel insert 4 having a bolt insertion hole 4a penetrating the step portion 3a is integrally formed on the straight wall 2a. The wall 2b is integrally formed with a steel insert 5 having four bolt insertion holes 5a penetrating the step 3b.

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

The material of the straight walls 2a, 2b is preferably a thermoplastic synthetic resin such as vinyl chloride resin or polyethylene, and is used as a filler to grind inorganic substances such as calcium carbonate and mica and industrial waste such as FRP. It is also possible to mix them.

The metal inserts 4 and 5 are obtained by fusion-coating a steel plate insert having a thickness of 3 mm with the same kind of thermoplastic synthetic resin as the straight walls 2a and 2b, and then integrally molding the straight walls 2a and 2b. The bolt 7 and the nut 8 are preferably made of stainless steel, FRP, etc., which have excellent corrosion resistance. The packing 6 is preferably made of water-expandable rubber obtained by mixing and molding water-absorbent plastic from the viewpoint of ensuring water tightness.

FIG. 2 is a perspective view of the metal insert 4 shown in FIG. The annular ring portion 4b of the metal insert 4 is 20 to 20 times higher than the height of the step portion 3a of the straight wall 2a, and is embedded in the straight wall 2a as shown in FIG. A plurality of resin through holes 4c penetrate through the ring portion 4b, which has the effect of increasing the degree of adhesion with the straight wall 2a by integral molding. Pipe insertion holes 4a are formed at four locations by connecting a pipe 4d to the outer peripheral surface of the annular ring portion 4b and penetrating from the inner peripheral surface of the annular ring portion 4b to the outer peripheral surface.

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 penetrates from the inner peripheral surface to the outer peripheral surface of the annular ring portion. The bolt insertion holes 5a are formed at four places.

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

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

The metal insert 5 integrally formed with the step portion 3b of the straight wall 2b also has a pipe protruding from the inner peripheral surface and the outer peripheral surface of the annular ring portion in accordance with the shape of the metal insert 4. By forming a bolt insertion hole 5a which connects and penetrates from the inner peripheral surface of the annular ring portion to the outer peripheral surface, inserts a combination bolt 7 with the above metal insert, and tightly connects with a nut 8 to connect the present invention. It can be carried out.

In each of the above embodiments, the shape of the plurality of resin through holes 4c is not limited to the circular hole, and may be a square hole. Each of the bolt insertion holes 4a and 5a is not limited to four, but may be plural, and preferably has a recess for preventing the head of the bolt 7 from rotating.

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

(Other Embodiments) 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 same 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, as in the above embodiment. A 3 mm-thick metal insert 9 having a bolt insertion hole 9a is integrally formed with the straight walls 2a and 2b at the connecting end.

The packing 6 is placed with the packing 6 sandwiched between the portions connecting the straight walls 2a and 2b, the bolts 7 are inserted into the bolt insertion holes 9a, and the nuts 8 are tightly connected to each other.

The metal insert 9 of this embodiment can be formed by combining the straight walls 2a and 2b with the same type.

The annular ring portion 9b of the metal insert 9 is designed to be embedded in the straight walls 2a and 2b as shown in FIG. 4, and the annular ring portion 9b has a plurality of resin through holes 9c. It penetrates and has the effect of increasing the degree of adhesion with the straight walls 2a and 2b by integral molding. A flange portion 9d is formed at the end of the annular ring portion 4b and extends outwardly and projects from the outer peripheral surfaces of the straight walls 2a and 2b. Plural bolt insertion holes 9a are formed in the flange portion 9d. .

The metal insert 9 is formed by fusion-coating a steel plate insert with the same kind of synthetic resin as the straight walls 2a 1 and 2b, and then forming the flange portion 9d from the outer peripheral surface of the straight walls 2a 1 and 2b in the same manner as in the above embodiment. It is projected and formed integrally with the straight walls 2a and 2b. The bolt 7 and the nut 8 are preferably made of stainless steel, FRP, etc., which have excellent corrosion resistance. The packing 6 is preferably water-expandable rubber obtained by mixing and molding water-absorbent plastic.

With the above structure, the same effect as that of the above-described embodiment can be more effectively exhibited.

[0033]

[Effect of device]

 As described above, the straight wall portion structure of the synthetic resin manhole according to the present invention has a structure in which a bolt is passed through the metal insert provided at the end of the straight wall to be connected and tightly connected. Since the wall is coated with the same kind of synthetic resin and is molded integrally with the straight wall, it can be integrated with the straight wall with sufficient strength, and the connection strength between the straight wall and the straight wall is sufficiently high. By coating with, it has high corrosion resistance and superior durability.

[Brief description of drawings]

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

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

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

FIG. 4 is a cross-sectional view of an essential part showing the 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 Manhole straight wall part 2a, 2b Straight wall 3a, 3b Step part of straight wall 4,5,9 Metal insert 4a, 5a Bolt insertion hole 4b, 9b Annular ring part 4c, 9c Resin through hole 4d, 4e, 5d Pipe 6 Packing 7 Bolt 8 Nut 9d Flange part

Claims (2)

[Scope of utility model registration request] 1. A straight wall structure of a synthetic resin manhole in which a straight wall is joined by engaging a stepped portion provided at the end of the straight wall of the synthetic resin manhole, wherein Is equipped with a metal insert that is coated with the same kind of synthetic resin as the straight wall and integrally molded with the straight wall, and bolts are inserted into the holes provided in the metal inserts of both straight walls to be joined and tightly connected. Straight 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, and the end portion of the straight wall is of the same kind as the straight wall. A tubular ring part coated with a synthetic resin is embedded in a straight wall by integral molding, and a flange part is provided with a metal insert protruding from the outer peripheral surface of the straight wall. A straight wall structure of a synthetic resin manhole, characterized in that bolts are passed through the holes and tightly connected.