JPH022794Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drainage basin composed of an invert made of a bottomed member and an adjuster made of a cylindrical member.

[Conventional technology]

The above type of drainage basin is buried in the soil by piling up Ajiaster on top of an invert, but in cold regions, as the stratum from the surface to a depth of several tens of centimeters freezes, Ajiastar is buried in the surrounding soil. If the ice is pushed up along with the ice, frost heaving may occur. When a frost heaving phenomenon occurs, the invert of the aziaxator rises, and earth and sand enters the gap created at the joint between the two, causing an inconvenient situation such as worsening the watertightness of the azimuth star and the invert. Furthermore, if the depth is deep, repair is also difficult.

Conventionally, in order to prevent the adjuster from lifting due to frost heaving, multiple locations (usually four locations at equal angles) on the lower end of the adjuster were fixed to the upper end of the invert using fixing fittings and screws. Even if the aziagaster is subjected to frost heaving force (uplifting force that acts on the aziagaster when moisture in the surrounding soil freezes), the aziagaster is prevented from floating up.

[Problem that the invention attempts to solve]

However, in order to fix the adjuster to the invert using fixing fittings and screws, it is necessary to pass the screws through the drill stand and the holes made by it, and these operations take a lot of effort and time. It was such an annoyance. Further, when frost heaving force acts on the adjuster star screwed to the invert, the load on the adjuster star is concentrated on the screwed part. Therefore, when the adjuster star is manufactured from a synthetic resin molded product (which is the case in most cases), problems such as the adjuster star being damaged or deformed at the screwed parts occur.

The present invention was developed to solve these problems, and although it is possible to fix both by simply piling up the adjuster star on top of the invert in one touch, even if the adjuster star is subjected to frost heaving force, the adjuster star To provide a drainage basin that does not float up and does not cause a situation where the load is extremely concentrated only at a specific part of the adjuster due to the frost heaving force.

[Means for solving problems]

In order to solve the above problems, the drainage basin of the present invention has an elastic engagement part with a U-shaped cross section that is externally fitted to and holds the annular protrusion formed on the outer periphery of the upper end of the invert. The gist lies in that guide pieces are provided at a plurality of locations on the lower end of the adjuster, and guide pieces for guiding the protruding portion into the engaging portion are provided diagonally downward at the lower end of the elastic engaging portion.

[Effect]

When the adjuster is pushed down with the guide piece in contact with the protrusion of the invert, the elastic engagement part with the U-shaped cross section is pushed outward and expanded by the protrusion guided by the guide piece against its elasticity. is,
When the upper end of the guide piece passes over the protrusion, the elastic engagement part elastically returns to its original state and externally fits into the protrusion. When the elastic engagement portion is externally fitted to the protrusion, the adjuster star and the invert are fixed, and when frost heaving force is applied to the adjuster star, the engagement between the elastic engagement portion and the protrusion prevents the adjuster star from lifting up. Ru.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 indicates an invert and 2 indicates an azimuth star, which are made of synthetic resin molded products such as polypropylene resin and polyvinyl chloride resin.

Invert 1 includes drain pipe connection port 11 and legs 12
and an annular groove 13 for stacking the adjuster star.

The adjuster star 2 is made of a cylindrical member, and its upper end is provided with an annular protrusion 22 having an annular groove 21 for stacking another adjuster star, and its lower end is provided with an annular bulge 23 protruding outward and a lower end thereof. The skirt portion 24 has a widening shape. Slit-shaped notches 25 are formed at a plurality of equally spaced locations on the lower end of the adjuster star 2, and extend over both the bulge portion 23 and the skirt portion 24. As clearly shown in FIG. 2, the above-mentioned bulging portion 23 and skirt portion 24 are formed by a large number of elastic engagement portions 23a having a U-shaped cross section and an obliquely extending portion integrally extending from the lower end of the elastic engagement portions 23a. It is divided into a downward guide piece 24a.

In the drainage basin described above, when the adjuster star 2 is placed concentrically with the protruding part 14 of the invert 1 and the guide piece 24a is pressed down from the state in which the guide piece 24a is in contact with the protruding part 14, the guide piece 24a The protrusion 14 is guided while being pushed outward by the protrusion 14 against the elasticity of the synthetic resin itself. Then, when the edge-shaped stepped part 23b formed at the upper end of the guide piece 24a, that is, the lower end of the elastic engagement part 23a, climbs over the protrusion 14, the elastic engagement part 23a moves as shown in FIG. The protrusion 14 elastically returns to its original state.
externally mated. In this state, the stepped part 23b of the elastic engaging part 23 and the protruding part 14 are firmly connected by engagement with each other, so even if the adjuster star 2 is subjected to frost heaving force while buried in the soil, There is no risk that the adjuster star 2 will float up from the invert 1. In addition, the elastic engagement portion 2 is connected to the protrusion 14.
3a engages around the entire circumference except for the notch 25, the load acting on the adjuster star 2 due to frost heaving force is dispersed to a large number of elastic engagement parts 23a, and a relatively small load is applied to each elastic engagement part 23a. It only costs. Therefore, the joint between the adjuster star 2 and the invert 1, that is, the elastic engagement portion 23a, will not be deformed or pushed outward due to frost heaving force.

In addition, if the annular groove 13 is provided in the protruding part of the invert 1 as shown in FIGS. 1 and 2, the elastic engagement part 23
By inserting the lower end of an adjuster star made of a cylindrical member (adjuster star commonly used in the past) into this annular groove, the adjuster star can be stacked on the invert, Invert versatility increases. Furthermore, by providing the protrusion 22 at the upper end of the adjuster star 2 as described above and providing the annular groove 21 in the protrusion 22, it is possible to stack another adjuster star, which has been commonly used in the past, on top of the adjuster star 2. In addition, it is also possible to stack adjusters having elastic engagement portions and guide pieces as shown in the drawings.

FIG. 4 shows an example in which the elastic engagement portion 23a of the adjuster star 2, which is the joint when the invert 1 and the adjuster star 2 are connected as described above, is tightened with a metal band 3 made of stainless steel or the like. There is. According to this, when the adjuster star 2 is pushed up by frost heaving force, the elastic engagement portion 23
Even if a is subjected to an outward force, the band 3 reliably prevents the elastic engagement portion 23a from expanding outward and separating from the protrusion 14. Therefore, there is an advantage that the adjuster star 2 is more securely fixed to the invert 1.

Figure 5 shows the flange 2 on the bulge 23 of the adjuster star 2.
6 is extended, and a slit-like cut 25a is also formed in this flange portion 26. In this case, the notch 25a constitutes a part of the notch 25 formed astride the bulging portion 23 and the skirt portion 24 of the adjuster star 2, as clearly shown in FIG. Therefore, the elastic engagement part 23a is integrally provided with a projecting piece 26a formed by dividing the collar part 26. When such a discharge box is buried in the soil, the elastic engaging portion 23a
Earth pressure acts in a direction that compresses 3a inward, and earth pressure acts downward on overhang piece 26a.
Therefore, even if the elastic engagement portion 23a receives an outward force when the adjuster star 2 is pushed up by frost heaving force, the elastic engagement portion 23a is
This means that the invert 1 is reliably prevented from expanding outward and separating from the protrusion 14, and even if the band 3 described in FIG. 4 is not used, the invert 1 There is an advantage that the adjuster star 2 is reliably fixed to the other side.

In addition, geological formations only freeze at a depth of several tens of centimeters from the surface, and usually only after inverting.
is buried deeper than the frozen part. In such a buried state, frost heaving force acts on the adjuster star 2 as the surface of the stratum freezes, and at the same time, a downward force acts on the overhang piece 26a. Therefore, there is an advantage that the frost heaving force acting on the adjuster star is offset by the downward force acting on the overhanging piece 26a, and the frost heave phenomenon of the adjuster star 2 is effectively prevented.

In FIGS. 1 to 4, a large number of notches 25 are formed in the bulge part 23 and skirt part 24 of the adjuster star 2,
Further, in FIGS. 5 and 6, by forming a large number of notches 25 in the bulging portion 23, the flange 26, and the guide piece 24, the notches 25 at the lower end of the adjuster star 2 are formed.
Although a case has been described in which a plurality of elastic engagement parts 23a and guide pieces 24a are provided around the entire circumference except for the outer circumference, these elastic engagement parts 23a and guide pieces 24a may be provided partially at the lower end of the adjuster star. For example, the seventh
As shown in the figure, elastic engagement portions 23a having the same width as the above-mentioned spacing and guide pieces 24a extending thereto may be provided at a plurality of equally spaced locations, for example, four locations, on the lower end of the adjuster star 2. When the elastic engagement part 23a and the guide piece 24a are partially provided at the lower end of the adjuster as in this embodiment, if the width of the elastic engagement part 23a is made too small, the load due to frost heaving force will be applied to the elastic engagement part. 23a, so it is desirable to set the width of the elastic engagement portion 23a relatively wide to such an extent that there is no such possibility.

Further, the adjuster star 2 shown in FIG. 7 has advantages in terms of molding. That is, it is necessary to provide the mold for the adjuster star 2 with a bulge for molding the elastic engagement part 23a, and the mold for molding the adjuster star 2 described in FIGS. 1 to 6 is required. It is difficult to release the mold unless this bulge is made into a split shape. However, in the adjuster star 2 shown in FIG. 7, if the molding die is provided with a bulge having the same width as the elastic engagement part 23a, after the mold is rotated by a predetermined angle, the elastic engagement part Since the mold can be released using the space between the 23a, there is no need to split this bulge.

[Effect of idea]

Since the present invention can be implemented as described above, the work of stacking the adjuster on the invert and fixing both becomes easier than before, and the adjuster is pushed up by the frost heaving force, creating a gap at the joint with the invert. Things will disappear. Furthermore, since the concentration of the load acting on the adjuster star due to the frost heaving force is significantly reduced, there is no possibility that the adjuster star will be deformed or damaged by the frost heave force.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing an invert of a drainage basin and an adjuster according to an embodiment of the present invention, Fig. 2 is a partial sectional view taken along line A-A in Fig. 1, and Fig.
The figure is a partially cutaway side view showing the assembled state of the drainage basin, Figure 4 is a partially cutaway side view showing the bulge portion tightened with a band, and Figure 5 is a side view of the drain basin according to another embodiment. A partially cutaway side view showing the assembled state;
FIG. 6 is a partial sectional view taken along the line BB in FIG. 5, and FIG. 7 is a cross-sectional plan view of a drainage basin according to still another embodiment. DESCRIPTION OF SYMBOLS 1... Invert, 14... Projection part, 2... Adjuster star, 23a... Elastic engagement part, 24a...
guide piece.

Claims (1)

[Scope of utility model registration request] This drainage basin is composed of an invert made of a bottomed member and an adjuster made of a cylindrical member, and is fitted externally to an annular protrusion formed on the outer periphery of the upper end of the invert to embrace the protrusion. A plurality of elastic engagement parts each having a U-shaped cross section are provided at a plurality of locations on the lower end of the adjuster, and a guide piece for guiding the protrusion into the engagement part is provided diagonally downward at the lower end of the elastic engagement part. It is characterized by drainage.