JPH042125B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in waterway troughs constructed on soft ground.

Conventional technology and problems Water channels are constructed by supporting concrete troughs and iron plate troughs on soft ground with a large number of short-span support piles.

Such waterways require long construction periods and poor construction efficiency due to the heavy troughs being supported by the above-mentioned large number of support piles, and the troughs having to be weather resistant and corrosion resistant. .

The present invention was made in view of this problem, and aims to provide a trough with high efficiency in waterway construction that can extend the span of support piles, and a trough with excellent weather resistance and corrosion resistance.

Means for Achieving the Object The means achieved by the present invention to achieve the above-mentioned object are to mold the trough body using GFRP, join the side frames to it, and join the bottom frame with a hybrid material. Then, an FRP layer is formed on the bottom frame to give it a physical appearance.

Function The trough body is given strength by GFRP, and the trough body is hybridized by the bottom frame and the hybrid material at the bottom of the trough body, and the deflection of the waterway surface of the trough body is minimized.
At the same time, the weight of the trough body and the water is shared by the side walls of the trough body to which the side frames are joined, and the deflection between the spans of the support pile is maintained by the side walls.

Example This will be explained with reference to the drawings.

The trough mold 1 has a U-shaped, V-shaped, etc. outer shape, and the wooden mold is used by arranging it upside down for molding the trough body 2 (see FIGS. 1 and 6). Trough mold 1 placed upside down
GFRP is laminated to an appropriate thickness (for example, about 10 mm thick) on the surface of the trough body 2 with a U-shaped cross section, a V-shaped cross section, etc. by curing. The pre-assembled side frames 3 are then joined to the outer surfaces of both sides (see FIGS. 2, 3, 7, and 8). The side frame 3 is
When constructing a waterway using a trough body 2 with a U-shaped cross section, a truss composed of a metal angle with an L-shaped cross section and a metal pipe with a square cross section is used to give the trough body 2 high structural strength and high rigidity and support the trough. Increase the span of the support pile (not shown) (e.g. 12m)
(see Fig. 3 and Fig. 4).
When constructing a waterway using the trough body 2 with a V-shaped cross section, the side frame 3 is constructed by joining one end of a plastic pipe with a rectangular cross section to one side of a thin and long plastic plate, and standing the pipe parallel to the plastic plate. The constructed frame (see Figures 8 and 9). Alternatively, another plastic plate having the same shape and size as the plastic plate of the frame body is joined to the other end of the plastic pipe of the frame body (upper end in the figure) so as to protrude in parallel and in the same direction. A frame body (not shown) constructed as above is used to reinforce the structure. The sides of the above-mentioned square cross-section plastic pipes are reinforced using FRP or GFRP pultruded pipes. In addition, when joining the plastic plate provided at one end of the plastic pipe of the frame to the back surface of the flange of the V-shaped trough body 2, use the CFRP described below.
They are joined together via a hybrid material 5 made up of the following, to provide beam rigidity to the trough body 2 having a V-shaped cross section. The bottom frame 4 can be constructed by joining pre-assembled frame bottom constituent members to the outer surface of the bottom while the laminated GFRP forming the U-shaped trough body 2 is not cured (see Fig. 4), or by joining the bottom frame separately. There is a case (not shown) in which the bottom frame itself is constructed at the same time as the members are joined together. In the former case, square pipes pultruded from GFRP are assembled in a lattice shape as shown in Figure 4, and a bottom frame component in which a wooden core material 7 is fitted into the lattice is connected to the uncured square pipes through a hybrid material 5. The bottom frame 4 is bonded to the bottom outer surface of the trough body 2, and at the same time, the wooden core material 7 is directly aligned with the bottom surface of the uncured trough body.
is formed into a lattice shape, and at the same time its bottom frame is joined to the uncured trough body 2 having a U-shaped cross section. In the latter case (not shown), the wooden core material 7 is joined to a predetermined portion of the bottom outer surface of the trough body 2, a GFRP layer 8 is formed on the surface of the joined wooden core material 7, and the above-mentioned
A GFRP square pipe is joined to a predetermined portion of the bottom outer surface of the trough body 2 via a hybrid material 5, and the bottom frame 4 is configured in a lattice shape.
be joined to. The GFRP square pipe of the bottom frame 4 has a plurality of pipes (in the illustrated example, two pipes are arranged on each longitudinal side) that are in contact with each other arranged in parallel on both longitudinal sides of the bottom outer surface of the trough body 2 having a U-shaped cross section. Only one trough is disposed in parallel at the center portion of the bottom outer surface width side of the trough body. Then, the trough body 2 has a U-shaped cross section.
All of the grid-like bottom frame 4 joined to the bottom outer surface of
FRP is overlaid on the surface of the GFRP square pipe via the hybrid material 5 to form an FRP layer 6, and FRP is also overlaid on the side frame 3 to form an FRP layer 6. (See Figures 5, 11, and 12).
The hybrid material 5 is a tape body formed from CFRP to a thickness of approximately 1 to 2 mm, and is used to provide rigidity and strength and to reduce the weight of the product. this
The CFRP hybrid material 5 is a rigid material reinforced by aligning carbon fibers and glass fibers in one direction and combining them, and when used in combination with GFRP and the side frame 3 and/or bottom frame 4, the trough can be Regardless of whether the cross-sectional shape of the body 2 is U-shaped or V-shaped, the trough body is hybridized to provide excellent rigidity and strength, so that it can be used even if the span of the support pile becomes long when constructing a waterway. By minimizing the deflection of the waterway surface, and by distributing the weight of the trough body and water to the trough side walls, the deflection between the spans of the support piles is held by the trough side walls, creating a lightweight yet highly rigid and strong trough. to be constructed. There are two examples of the bottom frame 4 when constructing a waterway with a trough body 2 having a V-shaped cross section.One is a frame configured in the shape of a plane ladder when the side frame 3 has the structure shown in the eighth and ninth figures. (see Figure 9), and when the side frame 3 is configured in the form of a ladder (not shown), a reinforcing rod (perhaps a footrest of a ladder) that spans and fixes the side frame 3 on both sides. There is an example of using only reinforcing rods (which are used to bridge and fix the structure like crosspieces). In the case of the ninth illustrated example, when the bottom frame 4 of these two examples is configured in a ladder shape, a large number of the above-mentioned reinforcing rods are connected and arranged in parallel to the long rods on both sides via the hybrid material 5, In the case of the illustrated reinforcing rods, a large number of reinforcing rods are bonded and fixed in parallel to the long rods on both sides of the ladder-like side frame via hybrid materials 5. The bottom frame 4 used for this V-shaped trough body 2 is made of FRP as all rod members.
Or use a square pipe pultruded from GFRP to reinforce the bottom. The hybrid material 5 is used to construct the bottom frame 4 itself or to join the side frames 3 and the bottom frame 4 to impart beam rigidity to the trough body 2. The wooden core material 7 used for constructing the bottom frame 7 of the trough body 2 having a U-shaped cross section is a lightweight bar material.

In FIG. 12, on the outer surface of the U-shaped trough body 2,
Another example is shown in which the side frames 3 and bottom frame 4 used in the V-shaped cross-section trough body 2 are joined, but the forming means for the U-shaped cross-section trough body 2 are almost the same as in the case of the U-shaped cross-section trough body 2 described above. Similarly, the side frames 3 and the bottom frame 4 are substantially the same as those in the case of the V-shaped trough body 2.

Effects of the Invention Since the present invention is configured as described above, a robust and lightweight trough having high strength, rigidity, weather resistance, and corrosion resistance can be obtained.

Therefore, it is possible to provide a trough suitable for construction on soft ground by widening the span of the support piles, and also to provide a trough with high construction efficiency by reducing the number of support piles.

[Brief explanation of drawings]

The drawings schematically represent an embodiment of the manufacturing method of the present invention in the order of steps, and FIG. 1 is a partial perspective view of a mold used for molding a trough body with a U-shaped cross section, and FIG. 2 shows the process of molding the trough body. Partial perspective view shown, 3rd
The figure is a partial perspective view showing the side frame joining process, FIG. 4 is a partial perspective view showing the bottom frame joining process, FIG. 5 is a partial perspective view showing the trough body before demolding, and FIG. FIG. 7 is a partial perspective view showing the molding process of the trough body, FIG. 8 is a partial perspective view showing the side frame joining process, FIG. 9 is a partial perspective view showing the bottom frame joining process, FIG. 10 is a partial perspective view showing the trough body before demolding, FIG. 11 is a partial perspective view of the completed trough with a U-shaped cross section, and FIG. The figure is a partially enlarged vertical cross-sectional view, Fig. 13 is a partially perspective view of a completed product with a V-shaped cross section, and Fig. 14 is a partially enlarged longitudinal sectional view.
The figure is a partial perspective view showing another example of a trough with a U-shaped cross section. In the figure, 1... trough mold, 2... trough body, 3
...Side frame, 4...Bottom frame, 5...Hybrid material, 6...
FRP layer.

Claims (1)

[Claims] 1. On the surface of the trough mold placed upside down.
A trough body is formed by laminating GFRP, side frames are joined to both outer surfaces of the trough body, a bottom frame is joined to the outer surface of the bottom using a hybrid material, and an FRP layer is formed on the side frames and the bottom frame to form an integrated structure. 1. A method for manufacturing a waterway trough, characterized in that