JPH0555659B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an upright retaining wall constructed by vertically stacking a main block and a sub-block.

<Conventional Technology> When demolishing or embanking land during civil engineering work such as building land for housing or building roads, retaining walls must be constructed to prevent the collapse of earth and sand. This retaining wall must be constructed of stone, concrete, reinforced concrete, etc., and must have a structure that can sufficiently withstand the earth pressure from the slope. Therefore, when constructing a retaining wall by stacking concrete blocks, a slope of 60% or 80% is generally provided.

In addition, in order to have the strength to withstand the size and earth pressure from behind, we made holes in the front and back for the reinforcing bars to pass through, and made the front and rear widths of the blocks different, so that when the blocks are stacked, the cross section becomes narrower as it goes upwards. A retaining wall block has also been proposed (for example, Utility Model Application No. 84603/1983).

<Problems to be Solved by the Invention> Therefore, in conventional retaining walls made by stacking concrete blocks, the upper land is scraped to provide a legal slope, or the lower land is cut into, making it usable. The effective area is decreasing. However, simply stacking concrete blocks upright cannot resist the tensile force acting on the back side of the block and the compressive force acting on the back side of the block due to earth pressure applied from behind. The retaining wall will collapse without any damage, and it cannot be used on soft ground.

Also, as proposed in Japanese Utility Model Publication No. 1984-84603, high earth pressure could be obtained by making the front and rear widths of each stage of blocks different.
The number of types of blocks increases significantly, or in other words, the number of types of formwork increases, which not only complicates the manufacturing process, but also requires time and effort to manage, and the construction becomes troublesome. Can not do it.

<Means for Solving the Problems> The present invention has been proposed in view of the above, and includes vertically extending first reinforcing bar insertion holes opened on the left and right sides at regular intervals in the main block, as well as openings at the rear of the first reinforcing bar inserting holes. A second reinforcing bar is opened in the front and rear reinforcing bars, and the first and second reinforcing bars that stand upright from the foundation concrete and extend vertically are inserted into each of the above-mentioned front and rear reinforcing bars, thereby stacking the main block. Constructing the lower part of the retaining wall, only the first reinforcing bars are extended upward from the lower part of the retaining wall, and third reinforcing bars are inserted at the left and right intervals at the constant intervals at positions where they can communicate with the first reinforcing bars. The upper part of the retaining wall is constructed by stacking the sub-blocks opened on the upper surface of the lower part of the retaining wall, and inserting the first reinforcing bar extending from the lower part of the retaining wall into the third reinforcing bar insertion hole of the sub-block. However, each reinforcing bar insertion hole in the main block and the sub-block is filled with filler concrete.

<Function> In the lower part of the retaining wall where high earth pressure from the slope acts, the earth pressure applied from behind the retaining wall causes
A compressive force acts on the front side of the main block, and a tensile force acts on the back side of the main block.
The first block is inserted vertically into the front side of the main block.
A reinforcing bar counteracts the compressive force, and a second reinforcing bar extending longitudinally through the back portion of the main block counteracts the tensile force.

Since the earth pressure in the upper part of the retaining wall is lower than that in the lower part, the first reinforcing bar of the sub-block alone can sufficiently resist the earth pressure.

<Examples> The present invention will be described below based on examples shown in the drawings.

The main block 2 used in the upright retaining wall 1 made of stacked blocks according to the present invention has an upper end face 3, a lower end face 4, left and right end faces 5, 6, a front part 7, a back part 8, The end face 3 has a protrusion 9 along the length direction.
A lower groove 10 is formed in the lower end surface 4 along the length direction, and vertical grooves 11, 11 are formed in the left and right end surfaces 5, 6 along the height direction. Main block 2
First reinforcing bar insertion holes 12, 12 are vertically opened from the upper end face 3 to the lower end face 4 at regular intervals on the left and right near the front face 7.

According to the embodiment in the drawings, the first reinforcing bar insertion hole 1
2 and 12 are opened from the protrusion 9 toward the lower groove 10. In addition, second reinforcing bar insertion holes 13, 13 are vertically opened near the back surface 8 of the main block 2 at the same position behind the first reinforcing bar insertion holes 12, 12.

Further, a plurality of V-shaped grooves 14 are formed laterally at regular intervals along the length direction on the back surface 8 of the main block 2. This V-shaped groove 14 increases the resistance to sliding of the chestnut stones 15 and waste concrete filled between the back of the stacked main blocks 2 and the slope of the construction site and prevents them from collapsing.

The case where the main block 2 constructed as described above is used to lay the blocks will be explained with reference to FIGS. 1 and 2. A chestnut stone 15 is laid at the bottom of the construction site, and a horizontal reinforcing bar 16 is placed on top of the chestnut stone 15. Place fresh concrete and harden it to form foundation concrete 17
Build. The lower end of a first reinforcing bar 18, which extends vertically to the upper end of the upright retaining wall 1 or is constructed by adding reinforcing bars along the way, is fixed to the horizontal reinforcing bar 16. In addition, the first reinforcing bar 18 is attached to the horizontal reinforcing bar 16.
The lower end of the second reinforcing bar 19 standing upright at the same rear position is similarly locked.

According to the embodiment shown in the drawings, the second reinforcing bars 19 are shorter than the first reinforcing bars and extend to the middle of the upright retaining wall 1. The first reinforcing bars 18, 18 are inserted into the first reinforcing bar insertion holes 12, 12 on the upper end surface of the foundation concrete 17.
, the second reinforcing bars 19, 19 are inserted into the second reinforcing bar insertion holes 13,
13 respectively, the main block 2 is stacked, and filler concrete 20 is inserted into each reinforcing bar insertion hole 12, 13.
Fill it with. At this time, each reinforcing bar insertion hole 12, 13 has a tapered shape that is narrow at the bottom and widens at the top, so that it can be filled with filler concrete 20 without any delay.

Also, when stacking the main blocks 2 in the horizontal direction, the longitudinal grooves 1 of the main blocks 2 adjacent to the left and right
1 and 11 communicate with each other, this vertical groove 11 can be used as a drainage hole or filled with filler concrete 20.

Next, the second stage main block 2 is shifted by 1/2 in the length direction so that each reinforcing bar 18, 19 is inserted into each reinforcing bar insertion hole 12, 13, and the protruding part of the lower main block 2 is inserted. 9 is the lower groove 1 of the upper main block 2.
0 and stack main block 2. At this time, the protrusion 9 and the lower groove 10 cause the main block 2 to
can be easily positioned in the front-back direction. and,
Each reinforcing bar insertion hole 12, 13 is filled with filler concrete 20, respectively.

As described above, the lower part of the upright retaining wall 1 is constructed by sequentially stacking the main blocks 2, but only the first reinforcing bars 18 are extended upward from the lower part.

In the embodiment shown in the drawings, the upper part of the upright retaining wall 1 is composed of a sub-block 2' having only a third reinforcing bar insertion hole communicating with the first reinforcing bar insertion hole 12, and the first reinforcing bar 1
Only 8 are inserted in one row.

This sub-block 2' has third reinforcing bar insertion holes 21, 21 on the left and right at the same regular intervals as the first reinforcing bar insertion holes 12, 12 at positions that can communicate with the first reinforcing bar insertion holes 12, 12 of the main block 2. and front and rear width (depth width)
is shortened, but other configurations such as horizontal length and vertical height are the same as main block 2.

To stack the sub-blocks 2', as shown in FIG. main block 2 with the
The third reinforcing bar insertion holes 21 are filled with filler concrete 20.

In addition, although the embodiment shown in the drawings shows an upright retaining wall 1 in which the main blocks 2... and the sub-blocks 2'... are stacked vertically, the blocks 2, 2'... are stacked with the blocks 2, 2'... It is also possible to construct the upright retaining wall 1 by doing so.

When the earth pressure from the slope is applied from behind to the upright retaining wall 1 constructed as described above, tensile force acts on the back side of each main block 2 where strong earth pressure is applied, and on the front side. Compressive force acts, but according to the upright retaining wall 1 of the present invention, the tensile force on the back side part can be handled by inserting the second reinforcing bar into the second reinforcing bar insertion hole 13 and filling the periphery with filler concrete 20. 2 reinforcing bars 19
The compressive force of the front side portion can be counteracted by the compressive strength of the first reinforcing bar 18 inserted into the first reinforcing bar insertion hole 12 and filled with filler concrete 20 around it. Because it is possible to
It is possible to construct an upright retaining wall 1 that is strong against strong earth pressure acting from behind.

In addition, since the earth pressure from behind is weaker in the upper part of the retaining wall 1 than in the lower part, it can be sufficiently withstood by the first reinforcing bar 18 inserted into the third reinforcing bar insertion hole 21 of the sub-block 2'. .

<Effects of the Invention> As explained above, according to the present invention, in the lower part of the retaining wall where the earth pressure from the slope applied from behind is strong, two rows of reinforcing bars are inserted in the front and back of each reinforcing bar through each hole opened in the main block. The action of the reinforcing bars makes it possible to strongly resist the earth pressure applied from behind the retaining wall.

In the upper portion of the retaining wall where the earth pressure applied from behind is relatively weak, the earth pressure can be sufficiently resisted by the action of the first reinforcing bars extending from the main block. Therefore, the retaining wall of the present invention can withstand large earth pressures simply by preparing and stacking two types of blocks, the main block and the sub-block. Moreover,
The main block is used in the lower part of the retaining wall where the earth pressure is strong, and the secondary block is used in the upper part of the retaining wall where the earth pressure is relatively weak, so the blocks can function more efficiently depending on the degree of earth pressure. , the block is
Since there are only two types of blocks, a main block and a sub-block, two types of formwork are required, making it easy to manufacture and manage the blocks, and the time and effort required for construction is no different from that of ordinary blocks.

In addition, since the upright retaining wall according to the present invention can cope with earth pressure without the need for a legal slope, the land will not be scraped away due to a method with a large slope, and the effective use of land can be promoted. It also has high practical value because it can be applied even to soft ground.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a sectional view of a retaining wall, Fig. 2 is a partially cutaway front view, Fig. 3 is a perspective view of the main block, and Fig. 4 is a front view of the same as above. FIG. 5 is a longitudinal sectional view of the same as above. 1 is an upright retaining wall, 2 is a main block, 2' is a sub-block, 12 is a first reinforcing bar insertion hole, 13 is a second reinforcing bar insertion hole, 17 is foundation concrete, 18 is a first reinforcing bar, 19 is a second reinforcing bar , 20 is filled concrete.

Claims (1)

[Claims] 1 First vertical reinforcing bar insertion holes are opened on the left and right at regular intervals in the main block, and second reinforcing bar insertion holes are opened behind the first reinforcing bar insertion holes, and the foundation concrete is inserted into each of the front and rear reinforcing bar insertion holes. The lower part of the retaining wall is constructed by stacking the main blocks by inserting the first and second reinforcing bars that stand upright from the retaining wall and extend vertically, and only the first reinforcing bars are inserted into the lower part of the retaining wall. A sub-block that extends further upwards and has third reinforcing bar insertion holes opened on the left and right at a constant interval in a position that can communicate with the first reinforcing bar insertion hole is stacked on the upper surface of the lower part of the retaining wall, and the retaining wall The first reinforcing bar extending from the lower part is inserted into the third reinforcing bar insertion hole of the sub block to form the upper part of the retaining wall, and each reinforcing bar insertion hole of the main block and the sub block is filled with filler concrete. An upright retaining wall made of stacked blocks, characterized by its structure.