JPS6252101B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a culvert structure having a metal culvert, which is used for waterways, ditches, etc.

(b) Prior art and problems Conventionally, metal culverts used in culvert structures have been known to have circular cross sections. There was an inconvenience that the area could not be secured and the flow rate of liquid such as water flowing inside the culvert was restricted.

As a countermeasure, it is possible to form the cross-section of the culvert into an oval shape and increase the cross-sectional area of the culvert relative to its height, but this method creates weaknesses as a structure on both sides and the upper part of the culvert. . That is, when the soil is shallowly covered, there is a risk that the soil around the backfill or culvert will be destroyed or deformed by the thrust force generated in the culvert.

(c) Purpose of the Invention In order to eliminate the above-mentioned drawbacks, the present invention is capable of effectively preventing deformation or destruction of adjacent soil due to forces generated in a culvert having an oval cross-sectional shape. Therefore, the first priority is to provide a culvert structure that can be installed with a shallow earth cover.
The second objective is to provide a culvert structure that can effectively prevent the culvert from being deformed by overload loads (vehicle weight + overburden load, etc.). .

(d) Structure of the invention That is, the present invention has a flexible metal culvert, an opening is formed in the upper part of the culvert in the axial direction of the culvert, and a concrete A reinforcing plate made of aluminum is installed to cover and close the opening, and arms are provided on both sides of the reinforcing plate so as to protrude outward from the side surfaces of the culvert.

(e) Embodiments of the invention Hereinafter, embodiments of the invention will be specifically described based on the drawings.

Fig. 1 is a perspective view showing one embodiment of the culvert structure according to the present invention, Fig. 2 is a front view of the culvert structure shown in Fig. 1, and Fig. 3 shows the connecting portion between the culvert and the protection plate. show. FIG. 2 is an enlarged sectional view taken along lines; FIG. 4 is a front view showing another embodiment of the invention; FIG. 5 is a front view showing another embodiment of the invention; FIGS. The figure is used for the culvert structure in FIGS. 4 and 5.
FIG. 10, which is a diagram showing an example of a method of connecting each segment, is a front view showing still another embodiment of the present invention.

As shown in FIGS. 1 and 2, the culvert structure 1 has a culvert 2 with an oval cross section made of a flexible metal corrugated sheet, and an opening is provided in the upper part of the culvert 2. 2c is formed over a width W in the axial direction of the culvert 2, that is, in the directions of arrows C and D. Connection plates 12,
12 are connected via connecting means 13 such as bolts, and as shown in FIG. , is planted upward in the figure, that is, in a protruding form in the concrete constituting the reinforcing plate 3, which will be described later, or a whisker muscle 16 is provided with its tip protruding upward in the figure. .

On the other hand, a reinforcing plate 3 made of reinforced concrete is placed above the opening 2c of the culvert 2 in the axial direction of the culvert 2 to cover and close the opening 2c.
That is, they are installed and formed in the directions of arrows C and D, and the reinforcing plate 3 and the culvert 2 are fixed via studs 15 or barbs 16 provided on the connecting plate 12. . The reinforcing plate 3 has a central portion 3a that covers and closes the opening 2c, and adjacent portions 3b are located on both sides of the central portion 3a, and their tips extend outward from the side surfaces 2a, 2a of the culvert 2 in the horizontal direction. 3c and 3c are extended in an extended manner. Note that water 10 is flowing inside the culvert 2.

Since the culvert structure 1 according to the present invention has the above configuration, the culvert structure 1 is installed in such a manner that the culvert 2 and the reinforcing plate 3 are both buried in the soil, as shown in FIG. . A culvert structure 1 having an oval cross section usually has earth loads 7 and 8 (number 7) near its top 1a.
numeral 8 is a load due to overburdening, etc., and number 8 is a load due to vehicles passing over the culvert structure 1. ), but the compressive force CF is transmitted from the central portion 3a to the arm portions 3b by the highly rigid reinforcing plate 3, as shown by the arrow in FIG. Arm part 3
The compressive force CF transmitted to b is supported by the passive resistance REF of the soil, so culvert 2 absorbs the compressive force.
There is no deformation due to CF.

Further, since the reinforcing plate 3 is formed with sufficiently increased rigidity, it can sufficiently withstand the overload loads 7 and 8 even if the culvert 2 has the opening 2c.

On the other hand, a pushing force PF that tries to push the soil outward acts on the culvert side surface 2a, but the soil portion PS adjacent to the culvert side surface 2a is affected by the compressive force CF transmitted to the arm portion 3b of the reinforcing plate 3. Since its vertical deformation is restrained by the vertical component force, large deformation of the soil due to the extrusion force PF is prevented. Furthermore, the arm 3b allows the critical shear plane 6 to be made much longer than the critical shear plane 6' without the arm 3b, thereby preventing large deformation and collapse of the soil adjacent to the culvert. .

Note that the reinforcing plate 3 of the culvert structure 1 according to the present invention is not limited to cast-in-place concrete, but can of course be formed of precast concrete, and as shown in FIGS. 4 and 5, precast concrete can be used. The reinforcing plate 3 can also be formed by connecting a plurality of segments 3d made of concrete using an appropriate connecting means. 6th
The method of connecting each segment 3d is shown as an example in FIG. 9 through FIG. 9, and in the case of FIG. In this case, both segments 3d, 3d are connected by a tongue-and-groove joint using grooves 3g and tongues 3h formed in the segments 3d, 3d facing each other.

Further, in FIG. 8, flanges 3e, 3e are embedded in each segment 3d, 3d, and the flanges 3e, 3e are embedded in each segment 3d, 3d.
3e, each segment 3d is connected by a fastening means 11 such as a bolt/nut,
Furthermore, in the case of FIG. 9, notches 3f, 3f are formed in the connecting portions of the segments 3d to face each other, and flanges 3e, 3e are embedded in each notch 3f, so that the flanges 3e, 3e, Therefore, the fastening means 1 connecting each segment 3d, 3d
1 is housed in the notches 3f, 3f.

Moreover, the flexible metal plate that constitutes the culvert 2 does not necessarily have to be a corrugated sheet formed into a corrugated shape, and may be a steel plate formed into a normal band shape.

Furthermore, the culvert structure 1 according to the present invention is provided with a reinforcing plate 3 fixed to the culvert above the culvert, and the reinforcing plate 3 increases the stability of the adjacent soil and increases the safety of the structure. Therefore, the culvert in the culvert structure 1 does not necessarily have an oval cross section;
As shown in the figure, it is of course possible to use a circular culvert. , it becomes possible to protect the culvert from deformation due to overburden loads 7 and 8, and it can contribute to increasing the size of the culvert).

(f) Effect of the Invention As described above, according to the present invention, the opening 2c is formed in the upper part of the flexible metal culvert 2 in the axial direction of the culvert 2, and the opening 2c is formed in the axial direction of the culvert 2. A concrete reinforcing plate 3 was installed on top to cover and close the opening 2c, and arms 3b, 3b were made to protrude outward from the culvert side surface 2a on both sides of the reinforcing plate 3. Since the culvert 2 is provided in a shape, it is not only possible to effectively prevent the deformation of the culvert 2 due to the overburden loads 7 and 8, but also to prevent the adjacent soil from being deformed by the force PF generated in the culvert 2, which has an oval cross-sectional shape. Culvert structures with shallow earth cover can effectively prevent deformation or destruction 1
installation becomes possible.

In addition, by covering and closing the opening 2c with the reinforcing plate 3, the strength of the structure can be maintained without providing a flexible metal plate such as a corrugated sheet in the opening 2c, and the entire culvert 2 portion can be closed. , it is possible to significantly save materials compared to the case where a flexible metal plate is used to form an (elongated) circular closed cross-sectional shape.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the culvert structure according to the present invention, Fig. 2 is a front view of the culvert structure shown in Fig. 1, and Fig. 3 shows the connecting portion between the culvert and the protection plate. FIG. 4 is a front view showing another embodiment of the present invention; FIG. 5 is a front view showing another embodiment of the present invention; FIGS. FIG. 9 shows the structure used for the culvert structure in FIGS. 4 and 5.
FIG. 10, which is a diagram showing an example of a method of connecting each segment, is a front view showing still another embodiment of the present invention. 1...Culvert structure, 2...Culvert,
2a...side surface, 2c...opening, 3...reinforcement plate, 3b...arm portion.

Claims (1)

[Claims] 1 Has a flexible metal culvert,
An opening is formed in the upper part of the culvert in the axial direction of the culvert, and a reinforcing plate made of concrete is installed over the opening to cover and close the opening, and further on both sides of the reinforcing plate. A culvert structure with arms that protrude outward from the side of the culvert.