JPH0453203B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to earth retaining panels, and particularly to earth retaining panels having an arched structure.

[Prior art]

The present inventor has disclosed various inventions regarding earth retaining panels having an arch-shaped structure. The inventor has already stated that the arch-shaped structure is extremely advantageous not only in tunnel structures and the like, but also in earth retaining panels.

Among these, the inventor proposed a method in which a prestressing force was applied by stretching a prestressing steel material b in a chord shape around an arc-shaped arch part a, as shown in Figs. 9 to 11. Displacement can be prevented by prestressing force, the occurrence of cracks can be suppressed as much as possible, and large earth pressure can be borne by the panel.

[Problems to be Solved by the Invention] Introducing prestressing force in this manner is technically sophisticated, requiring time and effort to manufacture the panel, and increasing manufacturing costs.

Also, as shown in Figure 11, one PC is connected to multiple sheets.
An invention has been disclosed in which steel materials are fixed together and a prestress force is applied to the whole at once. This invention has a problem in that if the vertical position of the panel is slightly shifted as shown in FIG. 12, it is extremely difficult to apply prestress force through the prestressing steel material. A similar problem also occurs when the panels are arranged on a curved line as shown in FIG.

Furthermore, applying a prestress force requires extremely advanced specialized technology, and a skilled person is indispensable.

[Means for solving problems]

The earth retaining panel according to the present invention has prismatic support portions on both left and right sides, an arcuate arch portion in the center, a horizontal bottom wall inside the arch portion, and an arch forming a right angle to the bottom wall. The reinforcing section has a reinforcing section stretched over the arch section in a chord shape, forming a shelf section surrounded by the arch section, the bottom wall, and the reinforcing section, and a plurality of reinforcing bars arranged in a chord shape around the arch section. Both ends of real reinforcing bars are arranged to extend to the center of the support.

〔Example〕

Hereinafter, the present invention will be explained in detail based on an embodiment shown in the drawings.

In the figure, A is a retaining panel according to the present invention, and 1 is an arcuate arch portion. Arch part 1
Prismatic support portions 2, 2 are formed on both left and right sides of. A horizontal bottom wall 3 is formed inside the arch portion 1, and forms a right angle to this bottom wall 3.
It has a reinforcing part 4 that spans the arch part 1 in a string shape.

The arch portion 1, the bottom wall 3, and the reinforcing portion 4 form a shelf portion 5 that is a groove-like space.

In the reinforcing part 4, a plurality of reinforcing bars 6 having a chord shape with respect to the arch part 1 are horizontally arranged vertically at appropriate intervals. Both left and right ends of the reinforcement 6 are extended and bent into a hook shape inside the center of the support parts 2, 2, so that the ends do not shift within the support parts 2, 2. Instead of bending the ends of the reinforcing bars 6, nuts or the like may be attached.

In the figure, 7 and 8 are drain holes. Further, an alignment member 9a protrudes between the left and right sides of the upper surface of the arch portion 1, and a hole 9b is recessed in the lower surface.

In order to install the earth retaining panel A having the above structure in a mountainous area, an anchor 10 as shown in FIGS. 6 and 7 is used. The anchor 10 has an anchor steel material 12 passed through a sheath 11.
is made of synthetic resin or the like and has a plurality of widened portions 13 with increased widths. The width w of the widened portion 13 is 3 to 10 times its height. This sheath 11 is filled with grout material.

This anchor 10 is placed on the embankment 15, and the retaining panel A is fixed with nuts 14. The work of sequentially laying embankment 15 on the anchor 10, arranging the anchor 10 thereon, and fixing the retaining panel A is repeated. (Fig. 9) The shelf 2 can be filled with earth and sand and can be covered with vegetation, making it look good and beautifying the environment.

When earth pressure acts on panel A, since the left and right ends are fixed by anchors 10, arch part 1
A force that tries to open it from side to side will act on it.
This force acts as a tensile force on the concrete of the arch section 1, but since there is a reinforcing section 4 in which reinforcing bars 6 are arranged, the reinforcing bars 6 extending to the prismatic support section bear this tensile force. to prevent horizontal displacement of the arch portion 1.

Therefore, the strength of the earth retaining panel A is improved and no cracks occur.

Since it has the reinforcing part 4 where the reinforcing bars 6 are arranged in this way, the reinforcing bars 6 bear the tensile force acting on the panel A, making it possible to use the panel A as a strong and durable panel. It can also be used as a good panel A.

What is shown in FIG. 3 is a case where the reinforcing portions 4 are largely formed above and below the bottom wall 3.

4 and 5 show the case where the shelf portion 5 is formed at the lower end of the retaining panel A.

〔Effect of the invention〕

The present invention has the above configuration and can obtain the following effects.

○B It has prismatic support parts on both sides and an arc-shaped arch part in the center, and because the arch effect of this arch part receives earth pressure, it becomes an earth retaining panel with high strength. In experiments, it was found that compared to conventional flat panels, there is a difference in yield strength of more than 5 times for the same volume of concrete used, and in some conditions more than 10 times.

○ Compared to flat panels, less concrete is used and the weight is significantly lower, making transportation and construction much easier.

○C Since it has a reinforcing section with reinforcing bars, the reinforcing bars bear the tensile force acting on the arch section, preventing horizontal displacement of the panel, resulting in a strong and durable panel. As shown in Attachment 1, this is
It is possible to obtain the same durability as when prestressing force is applied using prestressed steel.

○D Reinforcing bars only need to be arranged, no advanced technology is required to apply prestress force, and they can be manufactured at low cost.

○E There is no need to apply prestress force on site, making construction easier and eliminating the need for skilled workers.

○F It is possible to fill the ledge with soil and grow vegetation, which not only improves the appearance but also beautifies the environment. Cracks are also less likely to occur, and the panel surface remains clean and beautiful for a long time.

○G In particular, since it has a rectangular cylindrical bearing part, as the soil load increases, the height of the concrete may be increased somewhat without changing the thickness of the panel, and the number or thickness of reinforcing steel bars may be increased. The strength of the panel can be improved by simply changing the shape, and since there is no need to change the formwork, it is possible to provide a highly economical panel.

[Brief explanation of drawings]

Fig. 1 is a perspective view of one embodiment of the earth retaining panel according to the present invention, Fig. 2 is a longitudinal sectional view thereof, Fig. 3 is a longitudinal sectional view of another embodiment, and Fig. 4 is a perspective view of another embodiment. Figure 5 is a longitudinal sectional view of the anchor, Figure 6 is a plan view of the anchor, Figure 7 is a sectional view taken along the - line in Figure 6, and Figure 8 is a longitudinal sectional view of the anchor.
The figure is a perspective view of the construction state, Figure 9 is a perspective view of another embodiment, Figure 10 is a vertical sectional view thereof, and Figures 11 to 1.
FIG. 3 is an explanatory diagram of the prior art. A...Earth retaining panel, 1...Arch part, 2...Support part, 3...Bottom wall, 4...Reinforcement part, 5...Shelf part,
6... Rebar, 10... Anchor.

【table】

Claims (1)

[Claims] 1 A prismatic support part is formed on both left and right sides, an arc-shaped arch part is formed in the center, and a horizontal bottom wall is formed inside the arch part, and a support part that is perpendicular to the bottom wall and chord-shaped with respect to the arch part is formed. It has a reinforcing part that spans over it and forms a shelf part surrounded by the arch part, the bottom wall, and the reinforcing part. An earth retaining panel characterized by having reinforcement extending to the center of the support part.