JPH037764B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications This invention relates to an earth retaining method.

Prior Art As a conventional earth retaining method, a construction method having a configuration as shown in FIGS. 9 and 10 has been adopted. That is, a panel a having an arch-shaped cross section is used, the raised side of the panel a is erected toward the earth b side, and both left and right ends of the panel a are fixed to the earth with anchors c. .

Such an arch-shaped panel a can withstand a large bending moment, and has the extremely remarkable effect that it can be made thinner.

Problems to be Solved by the Invention However, the problem with such a configuration is the structure of the joint portion. That is, as shown in Fig. 10, joint mortar d is filled between the ends of left and right panels a, a, bolts e are inserted into both ends, and they are connected with nuts f.
Since the bending moment can be withstood only by the nut f and the nut f, the strength of the joint portion is insufficient and there may be concerns.

Means for Solving the Problems This invention provides a plurality of concrete block plates each having a wing section projecting from the left and right in a line-symmetric manner with an arcuate cross section, with the side on which the wing sections protrude facing the ground. The PC steel material is inserted into the insertion hole that runs horizontally from the base of the two block plates adjacent to each other on the left and right to the tip of the wing, and both ends are fixed at the base of each block plate to integrate them. The above-mentioned problem is solved by connecting all the block plates that are continuous from side to side.

Embodiment The present invention will be described in detail below based on an embodiment shown in the drawings.

(1) Concrete block board In the figure, 1 is a concrete block board used in the present invention. The block plate 1 has a rectangular shape in a front view, but has a plate-shaped base 2 in the middle between the left and right sides in a cross-sectional shape, and wing parts 3, 3 protrude from the base 2 in line symmetry to the left and right, respectively. Wings 3, 3
It is arc-shaped and becomes thinner towards the tip.

A plurality of vertical reinforcing steel members 4 are embedded in the base 2, and a plurality of anchor insertion holes 5 pass through the base 2 horizontally in the front and back directions.

Also, it passes from the base 2 to the ends of the wing parts 3, 3.
A PC steel material insertion hole 6 is passed through. That is, the insertion hole 6 is passed through from the left side of the base 2 toward the tip of the right wing section 3, and from the right side of the base 2 toward the tip of the left wing section 3. A plurality of insertion holes 6, 6 penetrating either left or right are also formed at appropriate intervals vertically.

(2) Installation of block plates A plurality of upright block plates 1 are arranged side by side, and the ends of the wing parts 3 of adjacent block plates 1 touch each other to form a continuous arc-shaped surface. Install it so that it overhangs the ground 7 side.

If the height is not enough, you can stack several sheets one above the other.

(3) Integration of left and right block plates The two adjacent block plates 1 and 1 on the left and right are
It is integrated by PC steel material 8. As the PC steel material 8, a PC steel stranded wire is used in the embodiment.
The PC steel material 8 is inserted through the insertion hole 6 from the base 2 of one block plate 1 and comes out from the end of the wing part 3, and then inserted into the insertion hole 6 from the end of the wing part 3 of the other block plate 1, and then passed through the insertion hole 6 from the end of the wing part 3 of the other block plate 1. get out of it. As described above, the PC steel material 8 is stretched across both block plates 1, and both ends are fixed with fixing tools 9 such as nuts or wedges under tension.

As described above, the left and right block plates 1, 1 are integrated, but the left block plate 1 is further integrated with the block plate 1 adjacent to the left, and the right block plate 1 is further integrated with the block plate 1 adjacent to the right. A plurality of block plates 1 that are continuous from side to side are connected in a chain.

(4) Fixing to the ground An anchor 10 such as a lock bolt is driven into the ground 7, the end is inserted into the anchor insertion hole 5 of the block plate 1, and fixed with the fixing tool 11, and the block plate 1 is fixed. Fix it to the ground 7.

(5) Other embodiments In the above embodiments, the block plate 1 is connected to the anchor 10.
Although it is fixed to the ground 7 with an anchor 10, effective earth retaining can be performed without fixing with an anchor 10.

As shown in FIG. 5, since the rotational moment acts on the block plate 1 as indicated by the arrow, the maximum compressive stress acts on the base 2, and the maximum tensile stress acts on the wing parts 3, 3 ends. When compared with a flat block plate, the girder height when considered in terms of cross-sectional shape is h, so when the same amount of concrete material is used, the girder height d used in the present invention is significantly higher than that of a flat block plate. Since the block plate has a sufficiently larger girder height, it is much more advantageous in terms of bending strength.
Therefore, this construction method is extremely effective even in the case of a self-supporting retaining wall that does not use anchors 10.

Furthermore, if the anchors 12 are inserted and driven vertically into each end of the wing parts 3, 3, safety against falling will be increased.

(6) Other embodiments As shown in Fig. 7, upper and lower block plates 1, 1
It is also possible to sandwich a block 13 having an L-shaped cross section between them and form a groove-shaped soil space 14 on the front surface of the block plates 1,1. It becomes possible to add soil to the soil space 14 and plant plants.

By increasing the height h of the block 13, the soil space 14 can be deepened and trees can be planted there.

As mentioned above, it can also be used for greening.
The appearance is extremely good.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the present invention, and FIG.
The figure is a front view, Figure 3 is a vertical sectional view, Figure 4 is a plan view of the block plate, Figure 5 is a cross-sectional view taken along the - line in Figure 4, and Figure 6 is a vertical cross-section of a conventional flat earth retaining plate. figure,
FIG. 7 is a plan view of another embodiment, FIG. 8 is a cross-sectional view taken along the line -- in FIG. 7, FIG. 9 is a cross-sectional view of the conventional example, and FIG. 10 is a partially enlarged cross-sectional view. 1...Block plate, 2...Base, 3...Wing part,
4...Reinforcement steel material, 5...Anchor insertion hole, 6...
PC steel material insertion hole, 7... Earth, 8... PC steel material, 9
... fixed fixture, 10 ... anchor, 11 ... fixing device, 12 ... anchor, 13 ... block, 14
...A land space.

Claims (1)

[Claims] 1. A plurality of concrete block plates each having wings with an arc-shaped cross section protruding from the left and right in a line-symmetric manner with respect to the base are erected in a continuous manner from side to side with the side where the wings project out facing the ground, and In the insertion hole that penetrates horizontally from the base of two adjacent block plates to the tip of the wing.
An earth retaining construction method characterized by inserting prestressed steel material, fixing both ends at the base, and connecting all block plates that are continuous from side to side.