JP3109695B2 - Small synthetic resin manhole opening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin small manhole opening device buried under a road or the like.

[0002]

2. Description of the Related Art Today, construction works for laying public sewers under roads are being carried out in various places. When burying sewer pipes, it is mandatory to install manholes at the starting point or junction of pipes, or at places where the direction or gradient of pipes changes, or if the pipes are straight and long It is mandatory to install manholes at predetermined intervals according to the pipe diameter. The manhole has an inflow port on the upstream side, an outflow port on the downstream side, and a manhole port on the upper side, and a manhole formed by closing the upper end with a lid.

In the case of a sewer main pipe buried under a wide road such as an arterial road, for example, when the pipe diameter is 300 mm or less, for example, the first manhole having an inner diameter of 900 mm is provided with 50 pipes.
m, and manholes made of concrete were used.

However, when the sewer pipe is buried under a winding road, it is necessary to install manholes at each bending point regardless of the distance, so that using a large number of large manholes increases costs. When a sewer pipe is buried under a narrow road such as a residential area, it may be difficult to install a large manhole such as when a water pipe or a gas pipe is already provided.

[0005] In order to solve these problems,
In recent years, small manholes having small inspection ports have become widespread. Especially when the sewer pipe is made of vinyl chloride resin,
If a manhole made of vinyl chloride resin is used, it is possible to join the joint between the sewer pipe and the manhole with an adhesive or a rubber ring, and it is possible to prevent flooding and water leakage,
Small manholes made of vinyl chloride resin have become widespread.

[0006] As a method of molding the vinyl chloride resin manhole, a method such as injection molding is conceivable. However, from the viewpoint of the manufacturing cost of a mold and the like, a blow molding method has conventionally been mainly employed.

However, as shown in FIGS. 9 and 10, for example, an inflow port 1 is formed at one end and an outflow port 2 is formed at the other end. In the manhole opening main body 5 which adopts a structure in which the manhole opening 4 is integrally formed by blow molding, since the manhole opening 4 is integrally formed by blow molding, the thickness of the manhole opening 4 is generally equal to the thickness of the connection pipe 3. It becomes thinner than the thickness.

The manhole port 4 has a manhole port cylindrical portion 6 located above the upper end of the connecting pipe 3, and a lower portion of the manhole port cylindrical section 6, and an upper peripheral surface of the connecting pipe 3. To both sides (front side and back side)
, Each of which is formed by a substantially fan-shaped manhole opening extension portion 7 extending over the connecting pipe 3. The thickness of the manhole opening cylindrical portion 6 and the thickness of the manhole opening extension 7 are both connection pipe 3. Thinner, especially from the base to the upper end.

Therefore, conventionally, a manhole opening 4 having a small thickness is used.
In order to reinforce the strength of the cylindrical socket 8, a part of one of the sockets of a cylindrical socket 8 made of a vinyl chloride resin or the like as shown in FIG.
The manhole opening cylindrical portion 6 is reinforced by bonding to the outer periphery of the manhole opening. Further, since the manhole opening extensions 7, 7 are thin, the outer peripheral side of the socket 8 and the manhole opening extensions 7, 7, FR
The P layer 9 is formed to reinforce the socket 8 and the manhole opening extensions 7, 7 integrally.

[0010]

However, one of the sockets of the socket 8 is cut off, and the outer periphery of the manhole opening 7 is thinned to reinforce the thin manhole opening.
When the P layer 9 is formed, operations such as cutting the socket 8 and attaching the FRP layer 9 are troublesome and costly,
There is a problem that the appearance is not good.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the entire outer periphery of a thin-walled manhole integrally formed by blow molding is reinforced integrally by fitting the manhole with a manhole. It is an object of the present invention to provide a small-sized manhole opening device made of synthetic resin which has good appearance.

[0012]

According to the present invention, there is provided a small-sized synthetic resin manhole opening device according to the present invention, comprising: a tubular connecting pipe having an inlet at one end and an outlet at the other end; A manhole opening main body having a manhole opening integrally formed by blow molding so as to be connected to the peripheral surface of the portion to stand up, a cylindrical portion having a receiving port formed on an upper portion, and one of a lower end of the cylindrical portion And a lower portion of the cylindrical portion located below the receiving portion of the cylindrical portion and the lower portion of the manhole opening main body. And a manhole mouth body fitted around the entire outer periphery of the manhole mouth.

[0013]

According to the synthetic resin small manhole opening device of the present invention, the thickness of the manhole opening which is integrally formed by blow molding so as to stand up while communicating with the peripheral surface of the connecting tube is equal to the thickness of the connecting tube. It becomes thinner and thinner from the base to the upper end, but the substantially fan-shaped extensions of the manhole mouth are located on both sides of the connecting pipe (front side and back side), and the manhole mouth By fitting the lower portion of the cylindrical portion and the extended portion over the entire outer periphery of the manhole opening of the manhole opening main body, the entire outer periphery of the thin manhole opening is integrally fitted and reinforced by the manhole opening body.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the synthetic resin small manhole opening device of the present invention will be described below with reference to FIGS.

The small-sized manhole opening device made of synthetic resin according to the present embodiment is, for example, a small-sized manhole opening device made of a vinyl chloride resin as shown in FIGS. Is formed.

The main body 11 of the manhole is integrally formed of a vinyl chloride resin, and has a cylindrical connection pipe 15 having an opening 13 at one end and an opening 14 at the other end. . Further, a cylindrical manhole port 16 is integrally formed by blow molding so as to stand up and communicate with the peripheral surface of the intermediate portion between the inflow port 13 and the outflow port 14 of the connection pipe 15. The diameter La of the manhole port 16 is formed substantially the same as the diameter Lb of the connection pipe 15. The inflow port 13 is connected to a sewage main pipe (not shown) fitted on the inner peripheral side, and the outflow port 14 is connected to a sewage main pipe (not shown) via a joint (not shown). As shown in the figure, an elastic ring such as a rubber ring
An annular concave groove 18 in which the 17 is fitted is formed. of course,
The inside of the inflow port 13, the outflow port 14, and the manhole port 16 communicate with each other.

The manhole 16 is connected to the connecting pipe 15.
Is formed above the upper end of the manhole. Further, from the lower end of the cylindrical portion 21 of the manhole opening downward, substantially radial positions (1/2 of the depth) of both peripheral surfaces (front peripheral surface and rear peripheral surface) from the upper peripheral surface of the connection pipe 15 to the lower peripheral surface. The substantially fan-shaped manhole opening extensions 22, 22 are extended to.

Further, since the manhole opening 16 is formed by blow molding integrally with the connecting pipe 15, the thickness of the manhole opening 16, that is, the thickness of the manhole opening cylindrical portion 21 and the manhole opening extension portions 22 and 22 is increased. Is thinner than the thickness of the connection pipe 15, and further, as shown in FIG. 3, becomes thinner in a tapered shape from the base to the upper end, and is tapered.

At the lower center of the connecting pipe 15, a leg 24 is projected.

The manhole opening body 12 is integrally formed of a vinyl chloride resin. As shown in FIGS. 1 to 6, a cylindrical portion 31 having a larger diameter than the manhole opening 16 of the connection pipe 15 is formed. On the lower end of the cylindrical portion 31, one of the opposite peripheral surfaces is extended downward to form extended portions 32, 32, and as shown in FIGS. The arc-shaped notch recesses 33, 33 are formed.

The cylindrical portion of the manhole mouth body 12
An annular stopper 34 protrudes inward at an intermediate portion of the inner periphery of the inner periphery 31, and a receiving port 36 is formed by the stopper 34 and an upper portion 35 of a cylindrical portion located above the stopper 34. The mouth 36 is connected to a manhole mouth tube (not shown), and the manhole mouth tube is opened near the ground surface.
The lower surface of the stopper 34 is the main body of the manhole.
It is locked on the upper surface of the 11 manhole opening 16.

The inner shapes of the cylindrical portion lower portion 37 and the extension portions 32, 32 located below the stopper 34 are the manhole mouth cylindrical portion 21 and the manhole mouth extension portion 22 of the manhole mouth 16 of the manhole mouth body 11. , 22 are formed substantially identically.

Next, the operation of this embodiment will be described.

The extension portions 32 of the manhole body 12 are connected to a connecting pipe.
15 are located at the manhole opening extensions 22 and 22 on both sides (front and rear sides) of the connection pipe 15 and cutout recesses 33 and 33 are connected to the connection pipe 15.
When the manhole mouth body 12 is adhered and fitted to the manhole mouth 16 of the manhole mouth body 11, the lower surface of the stopper 34 of the manhole mouth body 12 is positioned on the upper peripheral surface of the manhole mouth 16 of the manhole mouth body 11. The lower portion 37 of the cylindrical portion located below the stopper 34 of the manhole opening body 12 and the extension portions 32, 32 are formed by the outer periphery of the thin cylindrical manhole portion 21 and the thin manhole. Mouth extension 22,
The entire outer periphery of the thin manhole opening 16 is reinforced by the manhole opening body 12 by being fitted and adhered integrally and exactly to the outer periphery of the 22.

Accordingly, the entire outer periphery of the thin manhole 16, that is, the manhole mouth cylindrical portion 21 and the manhole mouth 16 can be easily attached to the manhole mouth 16 by fitting and bonding the manhole mouth body 12 to the manhole mouth 16. The manhole opening extensions 22 and 22 can be integrally reinforced by the manhole opening body 12, preventing cracks and depressions against external pressure such as earth pressure, etc., and preventing intrusion and leakage. It is not necessary to attach the FRP layer to the manhole opening extensions 22 and 22 as in the related art, and the cost is not increased.

In the above embodiment, the connection pipe 15 is described as being formed in a straight line. However, the connection pipe 15 of the present invention is not limited to a straight one, and as shown in FIGS.
The present invention can also be applied to a so-called bent pit having a bent connection pipe 15. In the case of a bent pit, the shapes of the extended portions 32a, 32b of the manhole mouth body 12 and the cutout recesses 33, 33 are set according to the shapes of the manhole mouth extended portions 22, 22 of the manhole mouth 16.

In the above embodiment, the inflow port of the connection pipe 15
13 has been described as a receptacle into which the sewage main pipe is fitted on the inner peripheral side, and the outlet 14 has been described as a spout joined through a joint, but the types of the inlet 13 and the outlet 14 of the present invention are as follows. It is not limited to these, and various types such as a TS port, a rubber ring port, and a universal port can be used.

Further, in the above embodiment, the manhole 16
Although the diameter La of the connection pipe 15 and the diameter Lb of the connection pipe 15 are substantially the same, the present invention can be applied to the case where the diameter La of the manhole 16 is smaller than the diameter Lb of the connection pipe 15.

[0029]

According to the synthetic resin small manhole opening device of the present invention, the substantially fan-shaped extension portions of the manhole opening body are located on the both circumferential surfaces (the front circumferential surface and the rear circumferential surface) of the connecting pipe.
By fitting the lower part and extension of the cylindrical part of the manhole mouth body to the entire outer periphery of the manhole mouth of the manhole mouth body,
The entire outer periphery of the thin manhole is integrally fitted and reinforced at the manhole body. Therefore, the entire thin manhole opening can be integrally reinforced by the manhole opening body, can sufficiently withstand the external pressure due to earth pressure and the like, and can prevent cracks and depressions. There is no need to attach it to the lower part, so that costs are not increased and the appearance is good.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing one embodiment of a synthetic resin small manhole opening device of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a vertical sectional side view of the same.

FIG. 4 is a perspective view of the mouthpiece of the manhole.

FIG. 5 is a vertical sectional front view of the manhole mouthpiece of the above.

FIG. 6 is a vertical sectional side view of the mouthpiece of the manhole.

FIG. 7 is a plan view showing another embodiment of the synthetic resin small manhole opening device of the present invention.

FIG. 8 is a front view in which a part is cut away.

FIG. 9 is a partially cutaway front view showing a conventional small manhole.

FIG. 10 is a vertical sectional side view of the same.

FIG. 11 is a longitudinal side view showing a socket used for the small manhole.

[Explanation of symbols]

 11 Manhole mouth body 12 Manhole mouth body 13 Inlet 14 Outlet 15 Connection pipe 16 Manhole mouth 31 Cylindrical part 32 Extension part 36 Receptacle 37 Cylindrical lower part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E03F 5/10 E03F 5/02

Claims (1)

(57) [Claims] 1. A cylindrical connecting pipe having an inflow port formed at one end and an outflow port formed at the other end, and blow-molded so as to stand up by being connected to the peripheral surface of an intermediate portion of the connecting pipe. A manhole mouth main body having a manhole mouth integrally projecting therefrom, a cylindrical portion having a receiving port formed on an upper portion thereof, and a substantially fan-like shape formed by extending downward on both opposite peripheral surfaces of one of the lower ends of the cylindrical portion. And a manhole mouth body in which the lower portion of the cylindrical portion located below the receiving portion of the extension portion and the cylindrical portion is fitted over the entire outer periphery of the manhole mouth of the manhole mouth body. A small-sized synthetic resin manhole opening device characterized by comprising: