JP2767371B2 - Slope stabilization method and concrete block used for it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stabilizing a slope, which is excellent in aesthetic appearance and can cope with a change in slope of a slope, and a concrete block used therefor.

[0002]

2. Description of the Related Art As a method of stabilizing a slope of this kind, there are a vegetation method, a method of arranging concrete blocks, and a method of constructing a method frame. Are better.

[0003]

However, the method of constructing a formwork requires a great deal of time to install and assemble the formwork on the slope, and also involves a risk of spraying the mortar.

[0004] On the other hand, when constructing a legal frame using a ready-made method frame block, if the anchor head is formed to protrude from the surface of the concrete block, the aesthetic appearance of the corner is impaired. Further, as shown in FIG. 11, when the gradient of the ground G changes in the middle in the height direction, and when it is desired to arrange the intersection angle β with the anchor line with respect to the slip line S according to a design requirement, The angles of forming the anchor holes of the concrete blocks 30 and 31 disposed on different slopes are different from each other, and there is a problem that a plurality of types of blocks must be prepared. Further, even if the slope is uniform at the construction site, the same concrete block cannot be applied to other construction sites with different slopes, and the versatility is lacking.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a simplicity of construction, a good aesthetic appearance when anchoring with an anchor, and a high versatility capable of coping with a change in slope slope. It is to be.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to arrange a large number of concrete blocks, which are substantially cross-shaped in plan view, adjacent to each other in a row on a slope, and the concrete blocks are arranged at the intersections. In the vicinity, an anchor insertion hole penetrating from the upper surface to the lower surface and expanding in a tapered shape as it goes to the lower surface is formed, and an anchor direction angle is arbitrarily selected within a range of the expansion angle of the anchor insertion hole. This can be solved by fixing the anchor.

In the concrete block, a concave portion is formed in the vicinity of the intersection thereof, the concave portion being recessed from the surface, and the anchor insertion hole is formed in a tapered shape from the center of the bottom surface of the concave portion to the lower surface. Insert the tensile material into the anchor insertion hole,
With the support plate housed in the recess as the bottom of the recess as a seat,
Anchoring can also be performed. In this case, after fixing the anchor head, it is preferable that the mortar is filled in the concave portion and the surface thereof is flush with the surface of the concrete block.

[0008] The concrete block used in this method is a concrete block for a legal frame having a substantially cross shape in plan view. The concrete block penetrates from the upper surface to the lower surface in the vicinity of the intersection. An anchor insertion hole that tapers toward the lower surface is used. Further, an anchor insertion hole is formed in the vicinity of the intersection, in which a recess recessed from the surface is formed, and an anchor insertion hole penetrating from the center of the bottom surface of the recess to the lower surface and expanding in a tapered shape toward the lower surface is used.

[0009]

According to the present invention, a concrete block is arranged on a slope. In this case, the arrangement can be completed only by lifting the object with a crane or the like and installing it at a predetermined position, and it can be quickly arranged with almost no human power. In addition, since the concrete blocks are regularly arranged adjacent to each other on the slope, a geometrically superior appearance is provided.

[0010] In addition, since the anchor is formed in addition to simply placing the concrete block on the slope, excellent stability can be maintained by pressing the slope with the concrete block.

Further, in the case of the stabilizing block according to the present invention, there is formed an anchor insertion hole that penetrates from the upper surface of the intersection to the lower surface and expands in a tapered shape toward the lower surface. Therefore, since the anchor installation angle can be set within the range of the expansion angle of the anchor insertion hole, even if the slope of the slope is changed, the same concrete block can be connected to another slope. The present invention can be applied to construction sites having different slopes, and can be a highly versatile slope stabilizing block.

Further, when the anchor head projects from the surface of the concrete block for fixing, the fixing head projects from the surface of the concrete block, and the aesthetic appearance of the corner is significantly impaired. On the other hand, according to the present invention, by forming a concave portion at the intersection of the concrete block and storing the anchor head in the concave portion, it is possible to prevent the appearance from being deteriorated, and conversely to obtain an excellent appearance. Moreover, when the support plate is installed on the bottom surface of the recess, even if the support plate is displaced in the surface direction, the support plate abuts against the wall of the recess and further displacement is prevented, and is stably held in the recess. You.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings. In FIG. 1, a concrete block 1 according to the present invention has a substantially cross shape in plan view, and a large number of the blocks 1, 1,... Are cross-shaped along a length direction (L direction) of a slope. Are arranged adjacent to each other so that one side thereof forms a line. In the embodiment, the other side is also arranged adjacently in a row in the height direction connecting the shoulder 2 and the tail 3.

When the ground strength of the slope is small, the slopes can be arranged in a staggered manner to reduce the load and increase the number of anchors.

The concrete block 1 has, for example, a length of one side of a cross of about 2 to 3 m and a thickness of 400 to 400 mm at the center.
It is 600 mm, 250-350 mm at the end, and a downward slope is formed toward the end. Furthermore, near the intersection of the cross,
A concave portion 10 that is recessed from the surface is formed, and an insertion hole 11 that penetrates from the center of the concave bottom surface 10A to the lower surface is formed. The insertion hole 11 of the embodiment is formed so as to be slightly upward in the direction of the shoulder 2 instead of the direction perpendicular to the slope. The bottom surface 10A of the recess 10 is formed in a direction orthogonal to the insertion hole 11.

At the time of construction, the concrete block 1
The suspension bolts 12 planted on the surface of each of the feet are wound with a wire, lifted up by a crane or the like, and arranged at predetermined positions.

Next, or simultaneously, simultaneously, a tensile member 20 such as a steel rod is inserted into the insertion hole, and an anchor body 21 is formed at the tip end thereof by injecting cement milk or the like. Anchor head 20
A is placed in the recess 10 and the supporting plate 22 is placed in the recess bottom 10A.
, And is fixed in a state where a tensile force is applied to the anchor body 21. These anchors are assigned to each block 1,
1 is performed every time.

It is desirable to fill the recess 10 later with a mortar 23 or the like and make the surface thereof flush with the surface of the block 1 from the viewpoint of aesthetics and rust prevention.

Further, in the case of the slope block 1 according to the present invention, as shown in FIG.
Are formed in such a manner that the holes are tapered toward the back side. Therefore, even in the case where the slope of the slope is different in the same construction slope, the same concrete block 1 can be shared with the slopes at different construction sites. Here, this point will be described in more detail. An anchor tensile force T for obtaining a predetermined safety factor F _S is expressed by the following equation.

[0020] _{T = {F S × ΣWsinθ-} Σ (Wcosθ + C
l)｝ / ｛cosβ + sinβ tanφ｝ where W is the weight of the split piece, θ is the slope of the slip surface, β is the angle between the anchor line and the sliding line, C is the adhesive force, and l is the cut piece. The arc length of the sliding surface, φ, is the internal friction angle.

Considering the above equation, the angle θ of the sliding surface
When the anchor is installed using the same concrete block with the same angle of the anchor insertion hole with respect to the block, even if the slope of the slope changes halfway, Changes, the anchor tensile force T changes. Therefore, it is necessary to use different anchor tensile forces for each group of blocks installed on different slopes, which complicates the construction. In this case, it is possible to unify the maximum anchor tension, but this causes waste in design.

On the other hand, as the intersection angle β becomes generally acute, the value of the denominator becomes smaller and the shape of the block becomes smaller, which is advantageous. Value) and the introduction tension are designed.
Therefore, if it is decided to prepare concrete blocks in which anchor insertion holes of different angles are formed so that the value of β is the same and the value of β is the same, the production becomes complicated, and in any case, In the case where the slope of the slope changes, there is a problem that one of the design and the construction is prioritized and the other is complicated.

However, in the case of the concrete block according to the present invention, the anchor direction can be arbitrarily set within a predetermined angle range with one concrete block, so that the slope of the slope changes in the middle. Even so, the same concrete block can also be used for other construction sites with different slopes, and such problems can be solved at once.

Next, a method of fixing the concrete block 1 while maintaining the adhesion between the concrete block 1 and the ground will be described in detail. The concrete block 1A shown in FIG.
The hardening material filling holes 13, 13,.
Are formed. If the slope has irregularities, a gap is formed between the lower surface of the concrete block 1A and the ground. , 1
After the hardening material is poured through 3... Or the gap between the bottom of the concrete block and the ground is filled with the hardening material by pressure injection, anchoring is performed to fix the concrete block and the ground. Fixing can be performed in a state of complete contact.

As the curable material, in addition to cement-based hardening materials such as mortar and concrete, urethane foam,
A resin-based hardening material such as styrene foam, or a water-glass-based hardening material used for a ground improvement method can also be used.

Further, as shown in the bottom view of FIG. 6, one having planar cutout recesses 14, 14,... Formed in the penetrating portions of the hardening material filling holes 13, 13,. Can also. As shown in FIG. 7, the notch recesses 14, 14,... May be cut out in a box shape by being dug down from each of the four surroundings. Further, the hardening material filling hole 13 does not necessarily need to penetrate from the upper surface to the rear surface, and may penetrate from the side to the rear surface,
Further, it is not necessary to provide the cut-out recesses 14 by the number corresponding to the cut-out recesses 14 in a one-to-one correspondence.
May be provided with only one filling port. In some cases, only the hardening material filling holes 13, 13... May be formed without forming the cutout recesses 14, 14,.

In another embodiment, as shown in FIGS. 9 and 10, the notch recesses 14, 14... Formed on the respective cross sides can be continued by the connecting grooves 16, 17. .

The construction procedure of the concrete block 1A will be described. First, an anchor hole is drilled from the slope surface, a tensile member 20 is inserted, and an anchor body 21 is formed at the tip of the tensile member 20.

Thereafter, the concrete block 1A is placed on the slope while the tensile member 20 protruding from the anchor hole mouth is passed through the anchor insertion hole 11 of the concrete block 1A from the rear end. As described above, after the concrete block is installed, the procedure may be such that the tensile member 20 is inserted and the anchor member 21 is formed.

Thereafter, after the tension member 20 is tension-fixed, the mortar is filled into the concave portion 10 and predetermined processing is performed on the fixing portion. Next, as shown in FIG. 8, the curable material 1 such as
5 is injected to fill the gap between the block bottom surface and the ground. After the concrete block 1A is installed, a filler can be injected from the hardening material filling holes 13, 13 before the tension member 20 is tensioned, or after the temporary tension and before the actual tension. It is preferable that the curable material has low fluidity so as not to sag even in the case of a steep gradient.

[0031]

As described in detail above, according to the present invention, it is possible to simplify the construction, and when fixing with an anchor, the appearance is excellent, and the same is applied to the change in the slope of the slope. The concrete block will be able to cope with it and will be highly versatile.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an arrangement state of a concrete block on a slope.

FIG. 2 is a plan view of a concrete block.

FIG. 3 is a bottom view thereof.

FIG. 4 is a sectional view of a concrete block fixed to the ground.

FIG. 5 is a block plan view when a hardening material filling hole is formed.

FIG. 6 is a bottom view when a notched concave portion is formed on the bottom surface of the concrete block.

FIG. 7 is a block bottom view showing a modified example of the notched concave portion.

FIG. 8 is a sectional view of a concrete block fixed to the ground.

FIG. 9 is a block bottom view showing another modified example of the cutout recess.

10 is a block sectional view in the case of FIG. 9;

FIG. 11 is a cross-sectional view of an installed state of a concrete block.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Concrete block, 10 ... Recess, 10A ... Bottom, 11 ... Anchor insertion hole, 12 ... Hanging bolt, 13
... hardening material filling hole, 14 ... notch concave portion, 15 ... hardening material, 16/17 ... connecting groove, 20 ... tensile material, 20A ... anchor head, 21 ... anchor body, 22 ... supporting plate

Claims (5)

(57) [Claims] 1. A large number of substantially cross-shaped concrete blocks in a plan view are regularly arranged adjacently on a slope, and the concrete block penetrates from an upper surface to a lower surface near an intersection thereof. An anchor insertion hole that expands in a tapered shape toward the lower surface is formed, and anchor anchoring is performed by arbitrarily selecting an anchor direction angle within a range of the expansion angle of the anchor insertion hole. Slope stabilization method. 2. A concrete block is provided with a concave portion recessed from the surface near an intersection thereof, and an anchor insertion hole formed in a tapered shape from the center of the bottom surface of the concave portion toward the lower surface. 2. The method for stabilizing a slope according to claim 1, wherein a tension member is inserted into the anchor insertion hole, and anchoring of the tension member is performed by using a supporting plate in which the anchor head of the tension member is accommodated in the recess as a bottom surface of the recess. 3. The method of stabilizing a slope according to claim 2, wherein, after fixing the anchor head, the recess is filled with mortar, and the surface thereof is flush with the surface of the concrete block. 4. A concrete block for a legal frame having a substantially cross shape in a plan view, wherein said concrete block penetrates from the upper surface to the lower surface in the vicinity of the intersection thereof, and expands in a tapered shape from the lower surface to the lower surface. The concrete block used in the slope stabilization method according to claim 1, wherein an insertion hole for an anchor is formed. 5. A concrete block for a legal frame having a substantially cross shape in a plan view, wherein the concrete block has a concave portion recessed from the surface near an intersection thereof, and extends from the center of the bottom surface of the concave portion to the lower surface. 3. A concrete block used in a slope stabilization method according to claim 2, wherein an anchor insertion hole is formed which penetrates and expands in a tapered shape toward the lower surface.