JPS632528Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a prefabricated box culvert, and more specifically, to a prefabricated box culvert characterized in that a bottom plate and a top plate are assembled after installation.

A box culvert is a box-shaped construction unit used when constructing sewers, underground passages, underground common ditches, etc. Conventionally, a normal box culvert has an almost neutral prismatic shape with openings at both ends.
The axial direction of the pipes is aligned with the extension direction of the sewer, underground passage, etc., and the pipes are successively laid and connected to form a hollow passage of a desired length.
This conventional box culvert is widely used because it can be produced in a factory and is relatively easy to install, but its shape is almost a closed box with four side sections. In order to install the culvert underground, it is first necessary to dig a trench wide and deep enough to accommodate the culvert. The burying work itself had the disadvantage of requiring considerable effort, such as having to finish it sufficiently flat to ensure good consistency.

This invention was made to eliminate the above-mentioned drawbacks of conventional box culverts.
The two vertical faces of the conventional box culvert, i.e. the top and bottom, have been eliminated to create a vertically penetrating box shape, which enables the well construction method for burial, and the bottom and top slabs are attached after burial. The gist is a prefabricated box culvert constructed as described above.

This invention will be explained below based on an embodiment shown in the drawings.

In FIGS. 1 to 3, the culvert main body, which is designated as a whole by the reference numeral 1, has two upper beams 13, 13 and two upper beams 11, 12 arranged parallel to each other and facing each other. They are connected by lower beams 14, 14 and formed into a hollow prismatic shape. Therefore, this culvert body 1 has a top opening 13 between the upper beam parts 13, 13.
A opens, and the bottom opening 14A opens between the lower beams 14, 14, and the upper beam 1 opens.
There is also an opening between 3 and the lower beam 14, resulting in a structure in which four sides of the rectangular hexahedron are open.

A stepped portion 15 is provided near the upper end of the inner side portions 11 and 12.
This is the planned position where the top plate 2 for closing the top opening 13A will be fixed.
Similarly, a stepped portion 16 is provided near the lower end of the inside of the side slab portions 11 and 12;
After installation, the bottom plate 2', which is the same as the top plate, is fixed to close the bottom opening 14A. Side plate part 1
1 and 12 and below the stepped portion 16 is formed as a sloped portion 18, and because of this sloped portion 18, the side portions 11 and 12 become thinner as they extend downward, and continue to the lower end portion 17. ing. In addition, the second
What is indicated by the reference numeral 20 in the figure is a gap defined between the lower surface of the bottom slab 2 and the inner surfaces of the both side slabs 11 and 12, and as will be explained later, this becomes an escape area for earth and sand. .

Moreover, as is clear from FIG. 3, the side plate portion 11,
12 is provided with a butting protrusion 19A extending in the vertical direction, and a butting groove 19B that is to be engaged with the butting protrusion 19A is provided on the other side end surface. These butt protrusions 19A and butt grooves 19B are used when sequentially connecting the culvert body 1 with other adjacent culvert bodies 1 along the direction extending to the underground passage or sewer, as shown in FIG. This is for positioning.

Next, we will explain an example of a construction method for constructing underground passages, underground common ditches, etc. using the prefabricated box culvert of this invention.

As shown in FIG. 4, first, a trench 3 of an appropriate depth is dug on the surface of the planned construction site, and the culvert body 1 is placed here. Then, as shown by arrow R, insert the shovel of the excavator into the top opening 13A and bottom opening 14A of the culvert body 1, and excavate the earth and sand in the direction penetrating these openings. , Select the discharge direction. In this way, as the earth and sand are excavated, the culvert body 1 gradually sinks due to its own weight.
In this case, the narrow lower end portions 17 of the side slab portions 11 and 12 and the inclined portions 18 leading thereto naturally help the culvert body 1 to settle. Also,
Since the lower end portion 17 of the side plate portion is narrow, it is easy to align with the bottom surface of the excavated groove, and it is easy to stabilize the installation at the desired installation depth and installation angle. Further, there is no need to cleanly discharge and remove the earth and sand 4 in the central part of the culvert body 1, as long as the earth and sand 4 settles in the relief part 20 and does not interfere with the attachment and fixation of the bottom plate 2'. By aligning and connecting the adjacent culvert bodies 1 installed one after another in this way using the abutting protrusions 19A and the abutting grooves 19B, and attaching a bottom plate and a top plate to each culvert body 1, this can be done. A hollow passage having the cross-sectional shape shown in FIG. 2 is extended along the underground passage or underground common ditch to be constructed.

As can be seen from the detailed description above, the prefabricated box culvert of this invention has the following features: (1) Since the bottom slab and top slab are attached after installation, efficient well construction methods can be used, and the number of man-hours for installing the culvert can be significantly reduced. Can be shortened. (2) Since it is the narrow lower end of the side slab of the culvert body that comes into contact with the bottom of the excavation groove, the culvert body can be quickly settled and installed.
It also has the effect of making it easier to match with the ground.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an embodiment of this invention, Figure 2 is a side sectional view showing the culvert body, Figure 3 is a sectional view taken along the - line in Figure 2, and Figure 4 is the installation of the culvert body. FIG. 5 is a simplified cross-sectional view showing an example of the construction method, and FIG. 5 is a cross-sectional view illustrating the connection between adjacent culvert bodies. 1...Culvert body, 2...Top plate, 2'...
Bottom plate, 11, 12...Side plate part, 13...Upper beam part, 13A...Top opening, 14...Lower beam part, 14A...Bottom opening.

Claims (1)

[Scope of utility model registration request] The culvert body is formed into a rectangular hexahedron shape by connecting two side slabs arranged in parallel and facing each other by two upper beams and a lower beam. A prefabricated box culvert having a top plate and a bottom plate respectively fixed to a top opening and a bottom opening to close the openings.