JPS6118981Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a formwork for forming a secondary concrete product, and particularly to a formwork for forming a box culvert for forming an underdrain.

Box culvert, which is a secondary concrete product for culverts, is formed using a formwork with frame edge-like end plates at both ends of an outer frame with a U-shaped cross section, and a core inserted between the openings of the end plates. , various external dimensions are used depending on the required cross-sectional area of the flow path. Conventionally, separate molds were used to mold box culverts with different external dimensions, which required molds of various sizes to be prepared, which was extremely uneconomical and Ta.

This invention aims to economically form box culverts of various sizes by providing a formwork that can form multiple types of box culverts of different sizes using a single formwork. The lower edge and both side edges of the frame edge-shaped end plate provided at both ends of the U-shaped outer frame are integrally formed, and the upper edge of the end plate is movable between these side edges. It is also characterized in that it is fitted so that it can be fixed at two or more predetermined positions.

Hereinafter, a detailed description will be given based on the embodiments shown in the drawings.

FIG. 1 shows a mold for forming a box culvert of this invention, in which 1 is a bottom plate, 2 is a fixed side plate, and 3 is a movable side plate. The fixed side plate 2 is fixed to the bottom plate 1, and the movable side plate 3 is hinged to the bottom plate 1 at its lower side 3a.
constitutes an outer frame with a U-shaped cross section that forms the outer wall surface of the box culvert. 4 and 5 are end plates, and each end plate 4 and 5 has its side sides 4e and 5e hinged to the fixed side plate 2, and has U-shaped end plate bases 6 and 7, an upper edge member 8, 9 to form a frame edge shape. 10, 10 are spacers attached to the end plate base 6 as needed, and 11, 12 are reinforcing members fixed to the upper ends of the end plate bases 6, 7. Lower edges 4a, 5a and both side edges 4b of frame edge-shaped end plates 4, 5,
4c and 5b, 5c are integrally formed as end plate bases 6, 7, and the upper edges 4d, 5d are formed by upper edge members 8, 9, and are fitted into the end plate bases 6, 7. By changing the mounting positions of the edge members 6 and 7, it is possible to form box culverts of various sizes.

As shown in FIGS. 9 and 10, the core not shown in FIG. It is configured,
Upper member 20 directly without fitting spacer 20c
The height of the core 20 can be changed by fastening the spacer a to the lower member 20b or by replacing the spacer 20c with one of a different width. 21 and 22 are the upper member 20a and the spacer 20c, and the lower member 20b and the spacer 20.
The bolts fastening c, 23 and 24 are bolts 2
This is the nut that screws 1 and 22 together.

The height of the core 20 configured as described above is adjusted according to the flow path cross section of the box culvert to be molded, and the core 20 is inserted and fixed between the openings 13 and 14 of the end plates 4 and 5.

The ends of the box culvert to be formed are provided with spigots for positioning when connecting them to each other. Some have inlays. The formwork of the illustrated embodiment is a formwork for forming a box culvert with a spigot provided around the entire circumference at the end,
One end plate 4 of the formwork is provided with a protruding frame portion 15 around its opening 13, and the other end plate 5 is provided with a recessed frame portion 16 around its opening 14.
The structure is such that the protruding frame portion 15 and the recessed frame portion 16 are formed rationally even when the mounting positions of the upper edge members 8, 9 relative to the end plate bases 6, 7 are changed.
The details of the structure will be described below, but if the box culvert to be formed has a spigot only on the side of its end, the end plates 4 and 5 described below
The structure of is more simplified.

2 to 5 show the structure of the end plate 4 in detail, and as is clear from the figures, the protruding frame portion 15a below positions A and A in FIG. 2 is formed integrally with the end plate base 6. The projecting frame portion 15b above the B and B positions is integrally formed with the upper edge member 8. The upper edge member 8 is mounted such that its base portion 8a is fitted between both side edges 4b, 4c of the end plate base 6, and its protruding frame portion 15b protrudes from the inner wall surfaces of the side edges 4b, 4c. ing. When a box culvert with the smallest size is to be molded, positions A, A and B, B in FIG. However, if the size of the box culvert to be formed is large,
Since the A, A position and the B, B position are separated, spacers 10, 10 are provided so that a complete projecting frame portion 15 is formed.
FIG. 4 shows bolts 17, 17 and spacers 10, 10 for fixing the upper edge member 8 to the end plate base 6.
Bolts 18, 18 for fixing to the end plate base 6
By providing a large number of insertion holes for bolts 17 in the end plate base 6, the upper edge member 8 can be mounted and fixed at two or more desired positions.

The details of the structure of the end plate 5 are shown in FIGS. 6 to 8, and as is clear from the figures, a recessed frame portion 16a is provided on the entire lower edge 5a and side edges 5b, 5c of the end plate base 7. The mounting position of the upper edge member 9 can be adjusted by fitting and fixing the upper edge member 9, which has both ends formed at different levels so as to fit into the recessed frame portion 16a of the lever, between the opposite side edges 5b and 5c of the end plate base 7. Regardless, a complete concave frame portion 16 is formed around the opening 14. Numerals 19 and 19 in FIG. 8 are bolts for fixing the upper edge member 9, and like the end plate 4,
By providing a large number of holes for inserting bolts 19 in the end plate base 7, the upper edge member 9 can be fixed at two or more desired positions, and the upper edge member 9 can be fixed at two or more desired positions. The edge member 9 is fixed and a box culvert of the relevant dimensions is formed.

As detailed above, the box culvert molding form of this invention is such that the upper edge members 8, 9 can be fitted and fixed in two or more positions to the U-shaped end plate bases 6, 7. Upper edge members 8 and 9 are placed at positions corresponding to the dimensions of the box culvert to be formed.
By fixing the core 20, adjusting the height of the core 20, and inserting it between the openings 13 and 14 of the end plate, box culverts of various sizes can be formed with one mold, and the dimensions of the box culvert can be adjusted. Since only the spacer 10 of the projecting frame portion and the spacer 20c of the core need to be prepared separately according to the size of the box culvert, box culverts of various sizes can be formed extremely economically.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view showing an embodiment of this invention, Figs. 2 to 5 are views showing the detailed structure of one end plate 4, and Fig. 2 is a front view as seen from the inside of the formwork. Figure 2 is a vertical sectional view of the central part, Figure 4 is a sectional view taken along section C-C in Figure 2, Figure 5 is a partial sectional view taken at section D in Figure 2, and Figures 6 to 8. 6 shows the detailed structure of the other end plate 5, FIG. 6 is a front view seen from the inside of the formwork, FIG. 7 is a vertical sectional view of the central part, and FIG. 9 is a front view of the core, and FIG.
The figure is a side view of the core. In the figure, 1 is the bottom plate, 2 is the fixed side plate, 3 is the movable side plate, 4 and 5 are the end plates, 4a and 5a are the lower edges, 4b and 4
c, 5b, 5c are side edges, 4d, 5d are upper edges, 4
e and 5e are side sides, 6 and 7 are end plate bases, 8 and 9 are upper edge members, 10 are spacers, 11 and 12 are reinforcing members, 13 and 14 are openings, 15 is a protruding frame portion, and 16 is a recessed frame portion , 20 is a core, 20a is an upper member, 20
b is a lower member, and 20c is a spacer.

Claims (1)

[Scope of utility model registration request] The lower edge and both side edges of the frame edge-shaped end plate are integrally formed, and the upper edge of the end plate is fitted between the side edges so as to be movable and fixed at two or more predetermined positions. A formwork for forming box culverts, which is characterized by: