JPH0452326B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shelter installed on a road for snow protection, wind protection, or the like.

[Prior Art] Conventionally, semicircular arch-shaped shelters made of steel have been constructed, but this is complicated to construct, has drawbacks in terms of construction time and cost, and also blocks traffic for a long period of time. In addition, due to severe corrosion, large amounts of money are being spent on maintenance and repairs. Therefore, in consideration of such problems, Japanese Utility Model Application Publication No. 59-85961 discloses a precast structure in which three-hinged arch-shaped concrete blocks of unit length are joined in the length direction, and these block groups are tied together with prestressing steel. A concrete snow shelter is proposed.

[Problem to be Solved by the Invention] The shelter of the above-mentioned prior art has a semicircular arch shape, and in such a shelter with a semicircular cross-sectional shape, when the road has a curved slope, the joint surface of the unit length concrete block is It is a three-dimensional curved surface, and if a shelter with such a curved surface is molded with concrete, the formwork will be complicated and costs will increase. That is, when such a semicircular arch-shaped shelter is used for a straight road, the joint surfaces perpendicular to the length direction of the unit-length concrete blocks are semicircular, and the semicircular joint surfaces are butted against each other to join. The same semicircular side formwork can be used for the joint surfaces of the concrete blocks when molding them.
However, when a semi-circular arch-shaped shelter is used on a curved portion of a road, the joint surface is formed obliquely in plane with respect to the longitudinal direction of the shelter due to the curvature of the road, so that it has a semi-elliptical shape. Since this semi-elliptical shape differs depending on the production rate of the road, a different semi-elliptical side formwork must be manufactured each time, and a different semi-elliptical side formwork must be prepared each time. was difficult in terms of manufacturing and cost.

Therefore, an object of the present invention is to provide a pre-bap PC shelter that can be easily constructed without blocking traffic as much as possible, is easy to adapt to curved slopes of passageways, is easy to manufacture, and has excellent durability. do.

[Means for Solving the Problems] The present invention includes a number of prestressed concrete arch unit plates formed of high-strength concrete, tensioned in the curved direction with PC steel, and having a polygonal cross-sectional shape. A polyhedral arch structure is formed by the plates, and the arch-shaped unit plates in the length direction of the arch structure are fastened together using PC steel materials for horizontal tightening.
Curved shape where the curve direction and length direction intersect each other
A polyhedral arch-shaped shelter is constructed by tensioning and integrating prestressing steel and straight prestressing steel.

[Function] In a factory, we construct a large number of prestressed concrete arch-shaped unit plates that are formed from high-strength concrete, tensioned with prestressed steel in the curved direction, and have a polyhedral cross-sectional shape, and when building on a curved road, we construct multiple straight members. The prestressed concrete arch-shaped unit plates are prefabricated on site using prefabricated prefabricated steel materials for horizontal tightening, and intersect with each other in the curvature and length directions. curved PC
Steel materials and straight PC steel materials are integrated into the entire structure to construct an arch-shaped PC shelter suitable for straight and curved roads.

[Example] Next, an example of the present invention will be described with reference to the accompanying drawings.

1 to 3 show an embodiment of the present invention,
As shown in the figure, a large number of prestressed concrete arch-shaped unit plates 3 made of high-strength concrete 1 and tensioned with unponded PC steel 2 are manufactured in a factory. This arch-shaped unit plate 3 has a plurality of protruding portions 4 extending in the curved direction over the entire length thereof, and has a plurality of flat surfaces 5a on the inner and outer surfaces.
The unbonded PC steel material 2 is embedded in the raised portion 4 in the curved direction, and is tensioned using a post-tension method. Both ends are fixed with nuts or the like (not shown). Further, a plurality of raised portions 6 are formed on the outer surface side over the entire length in the length direction, and a duct 7 is formed in the raised portion 6. The arch-shaped unit plate 3 is assembled on site, and the arch-shaped unit plates 3 are assembled and butted together in the curved direction and the length direction, and the curved direction is tightened at the top with a connecting member 8 such as a bolt or nut. , In the longitudinal direction, the PC steel material 9 for horizontal tightening is inserted into the duct 7 and fixed under tension, and in the curved direction and length direction, the PC steel material 2,
They are integrated under tension at 9 to form an arched groove.
In addition, to prevent concrete from adhering to the PC steel, unbonded PC steel coated with asphalt or tar, or post-tensioned PC steel using a sheath may be used as appropriate. High-strength concrete may also be used. Further, the lower end portion 10 of the arched groove is embedded and fixed in the foundation 11. Further, a pinge structure may be formed by providing an elastic member at the abutting portion of the top of the arch-shaped unit plate 3 and a menase hinge at the lower end thereof.

In this way, in the above embodiment, the curved direction and the length direction of the arch structure are integrated under tension by a large number of curved PC steel members 9 and straight PC steel members 2, so that it is relatively lightweight and yet prevents snow and falling rocks. It can demonstrate sufficient strength even when large loads are applied, improving safety, and can be easily constructed in a prefabricated manner on site without blocking traffic as much as possible. can. Further, as an advantage of the embodiment, since the raised portions 4 and 6 are formed on the outer surface side, the PC steel materials 2 and 9 act effectively, resulting in a strong shelter against external forces.

In addition, since a polyhedral arch structure is formed by the concrete arch-shaped unit plate 3 having a polygonal cross-sectional shape, and this arch structure is tensioned and integrated in the length direction to form an arch-shaped shelter, the bending slope of the road It will be applied to.

Particularly when manufacturing the concrete arch-shaped unit plate 3 in a factory, it is possible to form a joint surface corresponding to a curved road from a formwork made of a plurality of flat plates by linearly approximating a polygonal cross section. This will be explained in detail below using FIGS. 4 to 6. With radius r of the arch structure and radius of curvature R of the road, bending points P1, P2, ... outward bending point P17 from the center side of the radius of curvature. To explain the case of an arch structure having 17 bending points, as shown in Fig. 4, the relationship between the angular center O of the arch structure, each bending point Pn (hereinafter n is 1 to 17) and the road surface is as follows. Let the angle θn (in this example, θ1 = 11.25°) and the width of the arched groove at each bending point Pn be Ln, L9 is the same value as the road center width. For example, here, L9 = 2000 mm,
When R = 50000 mm and r = 5000 mm, the central angle θc of the radius R is determined to be 2.2918° using the following formula at pi and L9 = θc/360・2・π・R. Also, Ln can be found from the following formula, Ln=π/180θc・[R−r・cos{(n−1)・11.25}
] In the expanded explanatory diagram of FIG. 6, the chain line shows a part of the semicircular arch structure developed, and the solid line shows a part of the arch-shaped groove of the present invention approximated by a straight line by connecting each of the bending points. The values of the width dimension ln of the arch-shaped structure of the present invention between the bending points and the width dimension hn of the semicircular arch-shaped structure are as follows.

Pn ln (mm) hn (mm) P1 1802 1801 P2 1810 1809 P3 1825 1824 P4 1847 1845 P5 1874 1873 P6 1906 1906 P7 1942 1942 P8 1981 1980 Straight line approximation connecting adjacent bending points in this way The value of is half It shows an approximation that has almost no difference from that of a circular structure, and as a result, the joint surface of an arch structure can be easily manufactured using a formwork made of a plurality of flat plates to accommodate roads with different radii of curvature.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, a raised part for arranging prestressing steel may be formed on the inner surface or inner or outer surface of a prestressed concrete arch-shaped unit plate, or both ends of the arch-shaped groove may be rigidly connected to columns manufactured in a factory on-site. .

[Effects of the Invention] The present invention includes a large number of prestressed concrete arch-shaped unit plates formed of high-strength concrete, tensioned with prestressed steel in the curved direction, and having a polygonal cross-sectional shape. An arched structure is formed, and the arched unit plates in the length direction of the arched structure are tightened using PC steel materials for horizontal tightening.
Curved shape where the curve direction and length direction intersect each other
Since the polyhedral arch-shaped shelter is made up of tension-integrated polyhedral steel and straight prestressed steel, the entire shelter is strongly integrated by the curved and longitudinal prestressed steel, and the polyhedral arch structure It can be easily constructed to suit the curved slope of the road, and its effects are great.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment, Figure 1 is an overall sectional view, Figure 2 is a plan view of the same, Figure 3 is a sectional view of the main part, and Figure 4 shows an arch-shaped structure on a curved road. 5 is a cross-sectional explanatory diagram when used for
The figure is a partially enlarged schematic explanatory diagram showing the expanded state. 1...High strength concrete, 2...PC steel,
3... Arch-shaped unit, 4, 6... Protuberance, 5
...Polyhedron, 9...PC steel material for horizontal tightening.

Claims (1)

[Claims] 1 Molded with high-strength concrete and curved in the direction
A large number of prestressed concrete arch-shaped unit plates made of prestressed concrete steel material and having a polygonal cross-section are provided, and an arch-shaped groove forming a polyhedron is formed by the pre-stressed concrete arch-shaped unit plates, and the longitudinal direction of the arched groove is A polyhedral arch-shaped shelter is constructed by connecting the arch-shaped unit plates with horizontally tightening PC steel members and integrating the curved PC steel members and the straight PC steel members, which intersect with each other in the curved direction and the length direction, under tension. A pre-bap PC shelter featuring the following.