JPH0590088U - PVC small diameter manhole - Google Patents

Abstract

(57) [Summary] [Purpose] The manhole installed on public roads will be made of PVC to improve construction accuracy. A positioning mark is provided on a manhole 1 having a pipe joint-shaped invert 23 made of vinyl chloride, at the intersection of the extension lines of the main pipe axis 18 and the auxiliary pipe axis 12, and at a position visible from above. Since 19 is provided, the positioning of the PVC manhole 1 with high dimensional accuracy becomes accurate, and the construction accuracy is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a positioning mark for a small-diameter manhole.

[0002]

[Prior art and its problems]

 As is well known, manholes and halls are installed at the confluence points of drainage pipes, bent pipes, slope change points, and pipe diameter change points so that pipes can be inspected and cleaned.

By the way, in recent years, with regard to manholes, with the spread of sewerage, sewage mains (pipes of sewage pipe facilities, which are basically buried in public roads) are buried in community drainage and narrow roads. The conventional manholes that can be accessed by people are too large to be installed in a small space, which makes it difficult to perform excavation or sheet pile work in a narrow space. At the same time, problems such as difficulty in construction have arisen.

On the other hand, regarding the hall, there is no place to install a conventional large trout due to the narrowing of the residential land, and there is also a shortage of specialists who work on concrete trout. So-called small-diameter shavings have been used, in which various pipe joints are inserted in the residential land pipes connected to the pipes, and cleaning port pipes are raised on the pipe joints (for example, Japanese Utility Model Publication No. 2-45350). Gazette, Japanese Utility Model Publication No. 3-29672, etc.).

Compared with conventional concrete-made masu, such a small-diameter masu made of PVC can 1) prevent ingress of water. 2) A small diameter allows good connection with a PVC pipe. 3) It does not take space in the residential land, does not spoil the aesthetics, 4) reduces costs, and 5) has the effect of quick construction.

[0006] Therefore, this effect is combined with the recent increase in the number of drainage equipments (for example, flush toilets, washing machines, etc.) in homes, and a large number of small calibers have been installed in the residential land. It was

[0007] Therefore, along with the occurrence of the above-mentioned problems regarding the concrete-made manhole, a problem arises in connection with the concrete-made manhole after the PVC pipe is adopted for the sewer main. On public roads as well, the advent of small-diameter PVC manholes (where the cleaning pipe is larger than the aforementioned small-diameter pipes, the same applies hereinafter) is required.

However, unlike such a small-diameter manhole used in a residential area, such a small-diameter manhole is used in a public sewerage facility, and therefore the following conditions are added.

That is, since the sewer pipe is used semi-permanently and is deeply buried under the public road in principle, the quality of the material used is strictly checked, and the sewer main is naturally Since it is a flow-down system, strict construction accuracy is required. For this reason, the inspection of sewer construction is more rigorous. For example, inspections at each construction stage and numerical control called photo control and photo control are performed. For example, in this numerical management, the distance between manholes is actually measured, the depth of manhole is measured, the slope of the sewer main is checked, and the results are entered in the measurement result list, I have saved it.

Therefore, even if a small-diameter manhole made of vinyl chloride is used, there is an additional condition that it is necessary to meet these strict qualities, processing accuracy and inspection.

By the way, laying of a manhole is generally performed as follows. That is, a reference line is drawn on the ground according to the design standard (design plan), a sheet pile is driven, and a groove with a predetermined width is excavated in a straight line. Next, the sewer main is laid while maintaining the positioning and slope accurately in plan view.

FIG. 6 shows the state of such a sewerage facility. The figure is a part of the report on the work management mentioned above and is a plan view of the excavation work. In the figure, the solid line arrow shows the new sewer main 30, and the broken line arrow shows the existing sewer main. 31, solid circles are new manholes 32, broken circles are existing manholes 33, solid circles with black dots are new manholes 34 of other sizes. Then, for example, at the construction site number 47-1 in the figure, regarding the distance between the manholes, the design value is 37.60 ^m , the measured value is 37.90 ^m , and the difference is 30 cm. Fill out the list.

As is apparent from FIG. 6, many manholes 32 and 33 are installed at the confluence and inflection points of the main sewer pipe 30, and the main sewer pipes 30 and 31 are straight between the manholes. Has been constructed. Therefore, the positioning of the manholes 32 and 33, unlike the positioning of the small caliber, has a large effect on the construction accuracy because everything scales up.

By the way, the conventional small-diameter masu made of PVC is an off-the-shelf product with high dimensional accuracy by factory production, unlike the manhole made of concrete that is constructed according to the construction site. In order to make the invert of the main body compact in plan view (compact the injection molding die) and to smooth the flow of the main pipe on the merging side, the intersection point on the pipe axis in the invert And the center point of the cleaning mouth is out of alignment. Therefore, the positioning of the small-diameter manhole required for construction accuracy cannot be done by using the cleaning mouth as a guide, and as a result, many manholes are needed and in a small place. There was a new problem that the construction was difficult and the construction accuracy was reduced.

[0015]

[Means for Solving the Problems]

 Therefore, the present invention was devised to solve such a problem, and the gist thereof is a pipe joint-shaped invert having at least one sub-pipe axis intersecting with the main pipe axis. The main body of the small-diameter manhole is provided with a cleaning port or a spigot, and it is positioned at the intersection of the extension lines of the main and auxiliary pipe axes and at a position visible from above. It is a small-diameter PVC manhole characterized by having a mark.

[0016]

【Example】

 The structure of the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings. 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. 1, FIG. 3 is a plan view of various small-diameter manholes, and FIG. 4 is another small-diameter manhole. FIG. 5 is a plan view of the module shown in FIG.

FIG. 1 and FIG. 2 show a small-diameter PVC manhole 1 using a pipe joint with a diameter difference of 45 ° Y as an invert. receptacle 13 upwardly provided, the cleaning port for socket 13 is constituted by a TS receptacle (Taper Sige joint sockets), and is the size of 300 ^mm phi. In addition, the manhole main body 1a is connected to the sewer mains 30 and 31 (see FIG. 6) and is provided with downstream main receiving ports 14 and 15, which are TS receiving ports. It has become the size of the ^{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, that has become a size of 200 ^mm phi. The arrow 17 indicates the flow direction.

In this small-diameter manhole, the main pipe axis 18 and the sub-pipe axis 12 intersect at 45 °, and a positioning mark 19 which can be seen in a plane is provided at this intersection in the invert 23. ing. Therefore, when the small-diameter manhole 1 is temporarily installed, if this positioning mark 19 is brought on each pipe axis 18, 12 of the sewage main pipe and the merging side main pipe, the small-diameter manhole is immediately -Positioning of the rule 1 can be performed in a plan view. The positioning mark 19 may be formed in a cross shape at the time of molding, but a point mark having a grain surface or a seal may be attached.

Next, another small-diameter manhole will be described. In FIG. 3, (A) is a small-diameter manhole that uses a left 90 ° large-bend pipe joint as an invert, and the extension of each pipe axis of the upstream-side receiving port 14 and the downstream-side receiving port 15. The intersection of the lines is on the invert slope 20 where the positioning mark 19 is provided.

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

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

(D) is a small-diameter manhole using a right 90 ° large-bend Y pipe joint as an invert. As in (C), a positioning mark 19 is provided on the invert 23. ing .

Further, another vinyl chloride small-diameter manhole 24 will be described. In FIGS. 4 and 5, the small-diameter manhole 24 uses a right 90 ° large-bend Y pipe joint 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 3 00 ^mm phi. This manhole main body 25 is provided with a rubber ring joint receiving port 26 for joining the upstream side sewage main pipe, a spout 27 for joining the downstream side sewage main pipe, and a rubber for joining the merging side main pipe. A ring joint receiving port 28 is provided.

Further, the manhole main body 25 is provided with a cleaning port inlet 29 facing upward, and a rubber ring receiving port provided on the lower end side of a cleaning port tube (not shown) is vertically provided on the cleaning port inlet 29. I try to join in the direction.

The intersection of the extension line of the main pipe axis 18 of the sewage main pipe and the extension line of the sub-pipe line 12 of the merging side main pipe is located at the invert 23, where the positioning mark 19 is provided. Set up.

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

[0027]

[Effect of the device]

 According to the present invention, the following special effects can be obtained. 1) A positioning mark, which can be seen in a plan view, is provided at the intersection of each extension line of the main pipe axis and the sub-pipe axis line, so that the position of the small-diameter manhole in a plan view is accurate and the dimensional accuracy is improved. The positioning is suitable for PVC manholes produced in factories (for example, the upper and lower axes of sewage mains are aligned), and the construction accuracy is further improved compared to concrete manholes.

2) Since there is a positioning mark, construction of the sewer pipe facility becomes easy even on a narrow road.

3) Since the small-diameter manhole can be positioned accurately, there is no error in joining with the PVC sewer main, and the advantage of constructing the joint of the PVC sewer pipe facility is further demonstrated. ..

[Brief description of 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.

5 is a cross-sectional view of FIG.

FIG. 6 is a plan view of excavation work.

[Explanation of symbols]

1, 24 ... Small-diameter manhole, 1a, 25 ... Manhole main body, 12 ... Sub-pipe axis, 13 ... Cleaning port receptacle, 18 ... Main pipe axis, 19 ... Positioning mark, 29 ... Cleaning port Outlet

Claims (1)

[Scope of utility model registration request] 1. A main body of a small-diameter manhole, which is an invert of a pipe joint having at least one sub-pipe axis intersecting with the main-pipe axis, is provided with a cleaning port or an inlet. At the intersection of the extension lines of the main pipe axis and the auxiliary pipe axis,
Moreover, a small-diameter PVC manhole characterized in that a positioning mark is provided at a position visible from above.