JP2554322Y2 - PVC small diameter 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 positioning mark for a small-diameter manhole.

[0002]

2. Description of the Related Art As is well known, a manhole and a meeting place are installed at a junction of a drain pipe, a bent pipe, a change point of a slope, or a change point of a pipe diameter, and the inspection and cleaning of pipes are performed. To do.

By the way, recently, regarding manholes,
With the spread of sewers, the burial of sewer main pipes (tubes of sewage pipe facilities and, in principle, buried on public roads) also extends to settlement drainage and narrow roads, allowing existing people to enter and exit The concrete manholes are too large, and the installation space is difficult.Therefore, construction work such as excavation and sheet pile driving in a small place is troublesome, and the construction becomes difficult. .

[0004] On the other hand, with regard to the kaisho masque, there is no longer any place for installing a conventional large masque due to the narrowing of the residential land, and furthermore, there is a shortage of specialized technicians for constructing concrete masque. A so-called small-diameter truss, in which various pipe fittings are interposed in a pipe in a residential land connected to a pipe and a cleaning pipe is raised, has been used (for example, Japanese Utility Model Publication No. 2-45350). Gazette, Jitsuhei 3-2
No. 9672, etc.).

[0005] Such a small caliber made of vinyl chloride can 1) prevent infiltration of water compared with a conventional concrete masonry. 2)
If the diameter is small, the connection with the PVC pipe can be made well. 3)
It does not take up space in the residential land, does not detract from aesthetics, 4) lowers costs, and 5) works faster.

[0006] Therefore, such effects and recent drainage equipment in houses (eg, flush toilets, washing machines, etc.).
Due to the increase in the number of small-diameter sashes, many small-diameter masques have been installed in residential lands.

[0007] Therefore, along with the above-mentioned problems with the concrete manhole, there has been a problem in connection with the concrete manhole since the PVC pipe was adopted as the sewage main pipe. Also, on public roads, there is a demand for the appearance of a small-diameter PVC manhole (having a larger diameter cleaning pipe than the aforementioned small-diameter pipe).

[0008] However, unlike the small-diameter manhole used in the residential land, the small-diameter manhole is used for a public sewerage facility, so the following conditions are added.

In other words, since sewer pipes are used semi-permanently and are generally buried deep under public roads, the quality of the materials used is strictly checked, and of course the sewer main pipes are naturally drained. Because of the method, strict construction accuracy is required. For this reason, the inspection of sewerage works is even more severe, and, for example, numerical management and photographing management called inspection and workmanship management at each construction stage are performed. For example, in this numerical management, the actual measurement of the distance between manholes,
The actual measurement of the depth of the manhole, the inspection of the slope of the sewer main, etc. are performed, and the results are entered in a measurement result list and stored.

[0010] Therefore, even if a small-diameter manhole made of PVC is used, there is an additional requirement that these severe quality, construction accuracy and inspection must be met.

By the way, the manhole is generally laid as follows. That is, in accordance with a design standard (design drawing), a reference line is drawn on the ground, a sheet pile is driven, and a groove having a predetermined width is excavated linearly. Next, the sewage main pipe is laid while accurately maintaining the positioning and the gradient in plan view.

FIG. 6 shows the state of such a sewer system. This figure is a part of the report in the above-mentioned work management, and is a plan view in the excavation work. In the figure, the solid arrow indicates a newly installed sewage main pipe 30, the broken arrow indicates an existing sewage main pipe 31, The solid circles indicate the new manholes 32, the broken circles indicate the existing manholes 33, and the solid circles with black dots indicate the new size of the new manholes 34. For example, at the construction site of No. 47-1 in the figure, the design value of the distance between the manholes is 37.60 ^m , and the measured value is 37.9.
At 0 ^m , the difference is 30 cm, which is strictly entered in the measurement result list.

As is apparent from FIG. 6, a large number of manholes 32, 33 are installed at the junction or refraction point of the sewage main pipe 30, and between the manholes, the sewage main pipes 30, 31 are linear. It has been constructed in. Therefore, the positioning of the manholes 32 and 33 is different from the positioning of the small-diameter truss, since all of them are scaled up, which greatly affects the construction accuracy.

By the way, the conventional small-diameter PVC sash is
Unlike concrete manholes that are built according to the construction site, they are ready-made products with high dimensional accuracy due to factory production,
Moreover, in order to make the invert of the manhole body compact in plan view (to make the injection molding die compact),
In order to smooth the flow of the main pipe on the merging side, the intersection point on the pipe axis of the invert and the center point of the cleaning port are shifted. Therefore, the positioning of the small-diameter manhole required for the construction accuracy cannot be based on the cleaning port, and as a result, a large number of manholes are required, and the construction in a narrow place is required. However, there was a new problem that the ship had difficulty sailing and reduced construction accuracy.

[0015]

SUMMARY OF THE INVENTION The present invention has been devised to solve such a problem, and its gist is to have at least one auxiliary pipe axis crossing the main pipe axis. The main body of the small-diameter manhole, which is an invert in the form of a pipe joint, is provided with a cleaning port or a spigot, and at the intersection of each extension line of the main pipe axis and the auxiliary pipe axis,
A small-diameter PVC manhole is provided with a positioning mark at a position visible from above.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows a small-diameter manhole according to an embodiment of the present invention.
2, FIG. 3 is a plan view of various small-diameter manholes, FIG. 4 is a plan view of other small-diameter manholes, and FIG. 5 is a cross-sectional view of FIG. It is.

FIGS. 1 and 2 show a small-diameter PVC manhole 1 using a 45 ° Y-diameter pipe fitting as an invert.
The manhole body 1a is provided with a cleaning port 13 facing upward, and this cleaning port 13 is
S port (Taper Sige junction port), 300 ^mm φ
The size is. The manhole body 1a
Are connected to sewage main pipes 30 and 31 (see FIG. 6), and are provided with downstream main pipe receiving ports 14 and 15, respectively.
It is composed of an S port and has a size of 200 ^mm φ.
Furthermore, the sailing - the reel body 1a provided sub Pipe socket 16 of the merging side main pipe, this auxiliary pipe for socket 16 is composed of a TS socket, and is the size of 200 ^mm phi. The arrow 17 indicates the flow direction.

In this small-diameter manhole, the main pipe axis 18 and the auxiliary pipe axis 12 intersect at an angle of 45 °, and at the intersection of the inverter 23, a positioning mark 19 which can be viewed in plan is provided. ing. Therefore, when the small-diameter manhole 1 is temporarily installed, if the positioning mark 19 is brought on the respective pipe axes 18 and 12 of the sewage main pipe and the merging-side main pipe, the small-diameter manhole 1 is immediately put into operation. 1 can be positioned in a plan view. The positioning mark 19 may be formed in a cross shape at the time of molding, but a point display having a grain on the surface, a seal, or the like may be attached.

Next, another small-diameter manhole will be described. In FIG. 3, (A) is 90 ° left as an invert.
This is a small-diameter manhole using a large-angle pipe joint, and the intersection of the extension of each pipe axis of the upstream port 14 and the downstream port 15 is located on the inverted slope 20. Is provided with a positioning mark 19.

(B) is a small-diameter manhole using a 90 ° right-bend pipe joint as an invert. As in (A), a positioning mark 19 is provided on an invert slope 20. I have.

(C) is a small-diameter manhole that uses a 90 ° large bend Y pipe joint as an invert. The intersection of each extension line of the main pipe axis 18 and the auxiliary pipe axis 12 is an invert. To 2
3, a positioning mark 19 is provided here.

(D) is a small-diameter manhole using a pipe joint of a large 90 ° right turn Y as an invert.
Similarly to the above, a positioning mark 19 is provided on the inverter 23.

Further, another small-diameter PVC manhole 24 will be described. In FIG. 4 and FIG. 5, this small-diameter manhole 24 uses a pipe joint having a large bend 90 ° to the right as an invert. If the diameter of the sewer mains is 0.99 ^mm phi, cleaning port pipe (not shown) is in the magnitude of 300 ^mm phi. The manhole main body 25 is provided with a rubber ring joint receiving port 26 for joining the sewage main pipe on the upstream side, a spout 27 for joining the sewage main pipe on the downstream side, and a rubber for joining the main pipe on the merging side. A wheel connection socket 28 is provided.

Further, the manhole body 25 is provided with a cleaning port 29 upward, and a rubber ring receiving port provided at the lower end of a cleaning port pipe (not shown) is vertically provided in the cleaning port 29. It is made to join in the direction.

The intersection of the extension of the main pipe axis 18 of the sewage main pipe and the extension of the sub-pipe axis 12 of the junction main pipe is located at the inverter 23, where the positioning mark 19 is located. Provide.

Although the above embodiment has been described with reference to a small-diameter manhole, it is naturally applicable to a small-diameter square.

[0027]

According to the present invention, the following special effects can be obtained. 1) Since a positioning mark recognized in a plan view is provided at the intersection of each extension line of the main pipe axis and the auxiliary pipe axis, the position of the small-diameter manhole in the plan view becomes accurate, and the dimensional accuracy is reduced. High (for example, align the upper and lower axes of the sewer main)
Positioning suitable for factory-manufactured PVC manholes, construction accuracy is further improved compared to concrete manholes.

2) Since there is a positioning mark, the construction of the drainage facilities becomes easy even on a narrow road.

3) Since the positioning of the small-diameter manhole can be accurately performed, the joining with the PVC sewer main pipe does not change.
The advantages of the construction of the junction of the PVC sewerage facility will be further demonstrated.

[Brief description of the drawings]

FIG. 1 is a perspective view of a small-diameter manhole according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view of various small-diameter manholes.

FIG. 4 is a plan view of another small-diameter manhole.

FIG. 5 is a sectional view of FIG. 4;

FIG. 6 is a plan view of the digging work.

[Explanation of symbols]

1, 24: small-diameter manhole, 1a, 25: manhole body, 12: auxiliary pipe axis, 13: cleaning port receptacle, 18: main pipe axis, 19: positioning mark, 29: cleaning port Outlet

Claims (1)

(57) [Scope of request for utility model registration] 1. A main body of a small-diameter manhole, which is a pipe joint-shaped invert having at least one auxiliary pipe axis crossing the main pipe axis, is provided with a cleaning port or a spigot. At the intersection of each extension of the main pipe axis and the auxiliary pipe axis,
A small diameter manhole made of PVC, wherein a positioning mark is provided at a position visible from above.