JPH0696864B2 - Earth retaining block - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to an earth retaining block which is stacked vertically and horizontally and is used for retaining earth on slopes such as terraces or embankments. More specifically, the present invention relates to a block mutual connecting structure in which the earth retaining blocks are prevented from slipping by using a slip stopper.

2. Description of the Related Art In this earth retaining wall, earth pressure may act on the earth retaining block to cause displacement mainly in the front-rear direction. Therefore, it is necessary to prevent the positional relationship between the earth retaining blocks that are vertically stacked from occurring. Conventionally, as a technique for preventing this deviation, there is known a technique of fixing the earth retaining blocks to each other by passing a wire or a thin rod through a vertical hole passing through each earth retaining block. However, this technique has a problem in that workability is poor because a wire or the like is passed through a long vertical hole penetrating each earth retaining block. Therefore, in order to improve workability, an earth retaining block as shown in the microfilm of Japanese Patent Application No. 58-53660 (Japanese Utility Model Application No. 59-160647) is known. As shown in FIG. 7, this known earth retaining block has tapered holes 52a, 52b formed in the upper and lower abutment surfaces of the earth retaining block 51 in a tapered shape.
After fitting the lower half of the slip prevention body 53, which is formed in a frustoconical shape, into the taper hole 52a of the lower earth retaining block 51, the upper half of the slip retaining body 53 is fixed to the upper earth retaining block. The taper hole 52b of 51 is fitted and overlapped.

[Problems to be Solved by the Invention]

However, according to the structure disclosed in the microfilm of Japanese Utility Model Application No. 58-53660, since the holes formed in the earth retaining block 51 are the taper holes 52a and 52b, the taper hole 52a of the lower earth retaining block 51 is formed. Stopper 53 on the inner peripheral surface of the taper
The taper outer peripheral surface of the lower half is fitted, and the deviation preventing body 53 has no rattling. Therefore, it is necessary to precisely align and fit the tapered hole 52b of the upper earth retaining block 51 right above the upper half of the shift stopper 53. Since the earth retaining block 51 is made of concrete and has a large weight, it must be lifted by a crane or the like for stacking work, and workability must be deteriorated when precise alignment is required. . For example, when the upper earth retaining block 51 is inclined, it is difficult to fit the slip stopper 53.
Further, even when the upper earth retaining block 51 is swaying in the horizontal direction, it is difficult to fit the slip stopper 53. Further, when the upper earth retaining block 51 is fitted, the slip stopper 53
There was a problem that the slip-prevention body 53 is easily broken by the lateral force applied to the. An object of the present invention is to provide an earth retaining block which has a structure in which upper and lower blocks are connected by using a shift stopper and which has good workability when stacking blocks and which can prevent damage of the shift stopper. To do.

[Means for Solving the Problems]

In order to achieve the above object, a feature of the earth retaining block of the present invention is that the inner peripheral surface of the concave portion of the abutting surface of the upper and lower surfaces of the block is formed in a cylindrical shape.

[Action]

Therefore, a gap that expands downward is formed between the tapered outer peripheral surface of the lower half of the slip prevention body and the cylindrical inner peripheral surface of the recess of the soil retaining block below, and the upper end of the slip prevention body swings. It is possible. Therefore, workability when stacking the upper earth retaining blocks is good. That is, the upper earth retaining block can be fitted even if it is inclined, or the upper earth retaining block can be fitted even if the upper earth retaining block swings horizontally. On the other hand, in the completely fitted state, since there is no gap between the central portion of the shift preventing body and the recessed portion and the concave portion, there is no rattling. Further, when the upper earth retaining block is fitted, even if a lateral force is applied to the slip prevention body, it is hard to break.

【Example】

An embodiment of the earth retaining block of the present invention will be described below with reference to FIGS. As shown in FIG. 5, the earth retaining blocks 1 are vertically and horizontally stacked on a slope such as a terrace or an embankment to construct an earth retaining wall. The earth retaining block 1 is shown in FIGS. The earth retaining block 1 is made of concrete, and is provided below the inclined front plate 2, the side plates 3 and 3 provided at right and left sides of the front plate 2, and the front plate 2 and the side plates 3 and 3. The bottom plate 4 is provided horizontally, and the upper and lower abutting surfaces 5a, 5b of the side plates 3, 3 each have two cylindrical portions, that is, concave portions 7a, 7b formed in a perfect circle having a uniform diameter in the vertical direction. It is provided. Then, the concave portion 7b of the upper earth retaining block 1 and the concave portion 7a of the lower earth retaining block 1 are made to coincide with each other to form the cavity portion 8, and the slip stopper 9 is housed in the cavity portion 8. It is provided. In addition, the abutting surface 5a on the upper surface of the side plates 3, 3 and the abutting surface 5 on the lower surface
Step portions 6a and 6b are formed on b, respectively. The stepped portion 6a is provided such that the slope side (the right side in FIGS. 1 and 5) of the butting surface 5a is lowered. Further, the stepped portion 6b is formed such that the slope side of the abutting surface 5b falls downward. The earth retaining block 1 has a problem that the displacement in the front-rear direction is mainly caused by earth pressure. In this embodiment, the abutting structure of the step portions 6a, 6b,
It is configured to prevent the displacement in the front-back direction. As clearly shown in FIGS. 6 (A) and 6 (B), the shape of the shift stopper 9 is formed into two truncated cone shapes (substantially abacus ball shape) at the top and bottom, and the positioning of the recess 7a and the recess 7b is performed. It is designed to facilitate mating. Further, since a gap that expands downward is formed between the taper outer peripheral surface of the lower half of the shift stopper 9 and the cylindrical inner peripheral surface of the recess 7a of the lower earth retaining block 1, it is indicated by an arrow P. As described above, the upper end of the shift stop body 9 is allowed to swing (the reference numeral 15 indicates the axis of the shift stop body 9, and 16 indicates the central axis of the recess 7a). Therefore, the workability when the upper earth retaining block 1 is fitted to the upper half of the slip stopper 9 can be improved. In the earth retaining block 1 of this embodiment, gripping holes 10, 10 for carrying and stacking are formed on both side plates 3, 3. Also, both side plates
Drainage holes 11, 12, and 13 are formed in the lower portions of 3, 3 and the lower portion of the front plate 2 and the bottom plate 4, respectively. The bottom plate 4 of the earth retaining block 1 of the present embodiment is formed so as to project to the slope side and has an anchor function of resisting earth pressure. When stacking the soil retaining blocks 1, the protruding length of the bottom plate 4 is gradually shortened from the lower side to the upper side,
The bottom plate 4 is cut, so that the earth retaining wall as a whole equalizes the resistance to earth pressure. In the example shown in FIG. 5, the bottom two blocks of earth retaining blocks 1, 1 are the bottom plates 4 thereof.
The bottom plate 2 of the middle two steps of the earth retaining blocks 1,1 is cut short, and the bottom plate 4 of the upper two steps of the earth retaining blocks 1,1 is cut off at all protruding portions. . Further, in this embodiment, the earth and sand below the bottom earth retaining block 1 is removed to form a cavity, concrete is poured from the water draining hole 13 of the bottom plate 2, and the soil retaining block is inserted through the water draining hole 13. 1 forms a base 14 which is integral with 1 to make the earth retaining wall more rigid. When stacking the earth retaining blocks 1, the lower half of the slip stopper 9 is fitted into the recess 7a on the upper surface of the lower earth retaining block 1,
Next, the recess 7b on the lower surface of the upper soil stopper block 1 is fitted to the upper half of the slip stopper 9. Since the steps 6a and 6b are provided, the positioning in the front-rear direction is easy, and therefore the earth retaining block 1 to be overlaid is fitted and positioned while being slightly shifted left and right. The work for shifting the soil retaining block 1 to the left and right can be easily performed because the upper end of the shift stopper 9 can be swung in the recess 7a. That is, as shown in FIG. 6 (A), the upper earth retaining block 1
6 can be fitted even if it is inclined, and as shown in FIG. 6 (B), it can be fitted even if the upper earth retaining block 1 swings in the horizontal direction. On the other hand, in the completely fitted state as shown in FIG. 4, there is no gap between the central portion of the slip prevention body 9 having the largest diameter and the cavity portion 8, so that there is no rattling and the earth retaining block 1, 1 Mutual displacement can be completely prevented. Further, since there is rattling between the recess 7a and the slip stopper 9, when the upper earth retaining block 1 is fitted into the slip stopper 9,
Even if a lateral force is applied to the anti-slip body 9, it is difficult to break.

【The invention's effect】

In the earth retaining block of the present invention described above, since the inner peripheral surface of the recess of the abutting surface of the upper and lower surfaces of the block is formed in a cylindrical shape, the taper outer peripheral surface of the lower half of the slip prevention body and the lower earth retaining block. A gap that extends downward is formed between the concave portion and the inner peripheral surface of the cylindrical shape, and the upper end of the shift preventing body can swing. Therefore, it is possible to improve workability when stacking the upper earth retaining blocks by using a crane or the like. That is, it is possible to fit even if the upper earth retaining block is inclined, or it is possible to fit even if the upper earth retaining block is horizontally swung. Further, since there is rattling between the recess of the earth retaining block and the slip-preventing body, when the upper soil retaining block is fitted, even if a lateral force is applied to the slip-preventing body, it is difficult to break.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state in which two examples of an earth retaining block of the present invention are stacked.

FIG. 2 is a view showing the earth retaining block of FIG. 1, in which (a) is a front view,
(B) is a plan view, (C) is a bottom view, (D) is a side view,
(E) is a rear view.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is an enlarged view of the vicinity of the shift stopper of the encircling portion shown in FIG. 1B as seen from the front of the block.

FIG. 5 is a side view of an earth retaining wall using the earth retaining block of FIG. 1.

FIG. 6 is a state diagram when the upper earth retaining block of FIG. 4 is fitted to the slip prevention body. (A) is an upper earth retaining block inclined, and (B) is an upper earth retaining block. It shows the case where the block is shaking horizontally.

7A and 7B are views showing a conventional earth retaining block, FIG. 7A is a vertical cross-sectional view of a construction state, FIG. 7B is a vertical cross-sectional view of a single block, and FIG.

[Explanation of symbols]

 1 ... Earth retaining block 5a ... Butting surface 5b ... Butting surface 7a ... Recessed portion 7b ... Recessed portion 8 ... Hollow portion 9.

Claims (1)

[Claims] 1. A recess is provided in each of the upper and lower abutting surfaces of the block, and after the lower half of the slip prevention body, which is formed in a truncated cone shape, is fitted into the recess of the lower earth retaining block, In an earth retaining block for constructing an earth retaining wall, which is formed by fitting the recess of the upper soil retaining block into the upper half of the slip prevention body, the inner peripheral surface of the recess is formed into a cylindrical shape. A characteristic earth retaining block.