JP3347703B2 - Retaining wall method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining wall method for supporting a sediment load to prevent a slope from collapsing. In particular, a tensile material is buried as an anchor in the ground behind, and a block is formed by the tensile material. This is related to the supporting retaining wall method.

[0002]

2. Description of the Related Art Various types of retaining walls have been employed to prevent the slope from collapsing under the load of the slope.
In particular, as shown in FIG. 12, a tension member a is buried and fixed in the ground on a slope, and a block b disposed on the front surface of the slope is fixed to an end of the tension member to receive a sediment load acting on the block b. There are walls. The connection between the block b and the tension member a is achieved by means such as fixing the end of the tension member a to the end of the block b with a nut c.

[0003]

What results from such a fixing method is the localization of the load on the load. When the earth and sand load acts on the block b, an extremely large load concentrates on the connecting portion between the block b and the tensile member a to support the block b. There must be. The necessity of increasing the thickness of the local area increases the thickness and weight of the block itself, resulting in poor working efficiency and high block price. Further, the portion of the block b not fixed to the tensile member a had to withstand the sediment load only by the strength of the block b itself.

[0004] The problem of connecting and fixing the tension member buried underground to the block is further troublesome in the construction. The work of connecting the ends of the tensile material to the block one by one,
It was extremely tedious and took a considerable amount of construction time. Also, increasing the number of connecting parts has many structural disadvantages, and the tensile material may come off at the connecting part, and the greater the number of connecting parts, the higher the possibility of the accident will be is there.

[0005]

In the retaining wall method according to the present invention, a block having an arc-shaped cross section is arranged so that an intermediate portion protrudes with a slope as a back, and a tension member is hung on the front surface of the block. Further, the above-mentioned problem is solved by extending the tension member in a zigzag manner between the block and the underground fixed body and connecting it endlessly.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A retaining wall method according to the present invention uses a precast arch-shaped block having an arc-shaped cross section, and a plurality of blocks are arranged side by side on a slope. The block is installed so that the middle part protrudes toward the valley side. In the embankment, an arch-shaped fixed body with an arc-shaped cross section where the middle part protrudes toward the mountain side is installed. The fixed body may be made of precast, or may be formed in the shape of an arch by dry grout mortar or the like on site. The fixed bodies are also arranged side by side like the blocks, and each is paired.

[0007] A tension member is bridged between the block and the fixed body.
The tensile material may be a PC steel stranded wire or the like disposed in an unbonded sheath, or a zinc-aluminum-plated P
Various materials such as a C steel wire, a steel wire coated with a resin around the wire, and a tensile material made of carbon fiber can be used. The tension member is arranged in a zigzag state in which the tension member moves while going back and forth between the block and the fixed body. The tension member is hung on the valley side of the block and the crest side of the fixed body so as to intersect. When a plurality of tension members are used, they are connected to form an endless shape, and are hung on all blocks and a fixed body. An endless tension member is wrapped around the valley side of each block and the ridge side of the fixed body like a so-called ayatori string in which each of the left and right fingers is folded back.

It is preferable that a plurality of endless tension members are appropriately separated from each other vertically and hung on the valley side surface of the block. Further, a frictional resistor may be installed near the fixed body on the crest side of the tensile member. The frictional resistor is used to surround the tensile member with a dry grout mortar or the like from below and from the left and right, to make it easier to receive the surrounding earth and sand load, and to resist the pulling force of the tensile member. .

Since the bending moment acting on the block is dispersed by spreading the tension member around the valley side of the block, it is not necessary to locally reinforce the block, and the whole can be made thin and lightweight. Since the arch-shaped block and the fixed body receive the earth and sand load inside in a bag shape and are transmitted to the tensile material, the load transmission efficiency is good. By bending a plurality of endless tension members around one block, the bending moment is further dispersed and reduced. By endlessly connecting and pulling the tension member connected endlessly to the block and the fixed body, the connection portion of the tension member is extremely reduced. This improves work efficiency and shortens the construction period, and is a great structural advantage.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 to 4, reference numeral 1 denotes a block made of precast concrete, which has an arcuate cross section and is formed to be thin as a whole. A plurality of the blocks 1 are arranged left and right. An arch-shaped fixed body 2 having an arc-shaped cross section is installed on the mountain side in pairs with these blocks 1. The arc-shaped cross section may be a semicircle as in the embodiment, an elliptical semicircle, or various shapes such as a horseshoe shape. The fixed body 2 is formed on site by dry grout mortar.

A tensile member 3, which is a PC strand plated with zinc aluminum, is hung between the block 1 and the fixed body 2. The tension member 3 is wrapped around the valley side surface of the block 1, and the tension member 3 is stretched to the mountain side and hooked on the fixed body 2. In the embodiment, two tension members 3 are connected by a coupler 4 fixed by wedges to form one endless tension member 3, and the endless tension member 3 goes between each block 1 and the fixed body 2. The entire block 1 and the fixed body 2 are connected in a zigzag manner while moving back and forth.

The endless tension member 3 is not one, but in the embodiment, two members are arranged in each stage, and the tension members 3 are arranged above and below the block 1 and are wrapped around the front surface. A groove may be formed on the front surface of the block 1 or a guide projection may be provided in advance at a position where the tension member 3 is to be wound. FIG. 13 shows a bending moment acting on the conventional retaining wall block b. As shown in the drawing, when the end of one tensile member a is fixed, a large bending moment P is locally generated. On the other hand, when two tensile members 3 are applied to the block 1 as shown in FIG. 10 of the present invention, the bending moment P becomes extremely small. Further, if the number is made four as shown in FIG. 11, the bending moment P becomes so small as to be negligible. An embankment 5 is provided behind the block 1 thus constructed, and the fixed body 2 and the tension member 3 are buried in the embankment 5. These operations are repeated to stack the blocks 1 in a plurality of stages.

In FIG. 2, reference numeral 12 denotes a frictional resistor,
The cross section is shown in FIG. The frictional resistor 12 is formed by dry grout mortar, and surrounds the lower and right and left sides of the tensile member 3 and exerts a frictional resistance against a load to which the tensile member 3 tries to pull out due to the weight of the earth and sand acting as indicated by an arrow in the figure. Is occurring. As shown by the arrow in FIG. 6, when the earth and sand load acts, the load acts on the block 1 and the fixed body 2 as a horizontal force. As shown by the arrow in FIG. 7, the load becomes a compressive force on the frictional resistor 12
Act on.

FIG. 5 shows a case where the position of the block 1 is shifted by a step, and planting is possible. In addition, it is possible to improve the durability by covering the periphery of the tension member 3 spread around the front surface of the block 1 with a shotcrete 6 or the like. FIG. 8 and FIG. 9 show one obtained by combining a plurality of blocks 7 obtained by dividing the arc-shaped block 1 into one block 1.

[0015]

The present invention has the above-described configuration, and can obtain the following effects. Since the tension material is not connected to the block but fixed around the front of the block, the sediment load does not concentrate on the local area, and there is no need to apply large-scale reinforcement to the block, making it thin and inexpensive. ,
Construction is also easy. Since the block and the fixed body are arcuate arc-shaped and receive the load as a whole inside the bag, the load of the block is dispersed and the bending moment is also reduced, the overall thickness can be reduced, and it can be manufactured at low cost At the same time, construction becomes easy. By wrapping a plurality of tension members around the front surface of one block, the load is more dispersed, and the bending moment is extremely reduced. By connecting the endlessly connected tension members in a zigzag manner so as to move back and forth between the block and the fixed body, the connection points of the tension members are extremely reduced, and the connection work is greatly labor-saving, The construction period is short and can be constructed at low cost. In addition, there are great structural advantages. The provision of the frictional resistor makes it difficult for the tensile material to be pulled out.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a retaining wall method according to the present invention.

FIG. 2 is a plan view of the embodiment of FIG.

FIG. 3 is a sectional view of a frictional resistor.

FIG. 4 is a sectional view of the embodiment of FIG. 1;

FIG. 5 is a sectional view of another embodiment.

FIG. 6 is a plan view showing a load on a block.

FIG. 7 is a plan view showing a load on a frictional resistor.

FIG. 8 is a plan view of another embodiment of the block.

FIG. 9 is a plan view of another embodiment of the block.

FIG. 10 is a diagram showing a bending moment when two tensile members are applied.

FIG. 11 is a diagram showing a bending moment when four tensile members are applied.

FIG. 12 is a plan view of a conventional retaining wall method.

FIG. 13 is a diagram showing a bending moment in a conventional retaining wall method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Block 2 Fixed body 3 Tensile material 4 Coupler 5 Embankment 6 Shotcrete 8 Ground 9 Tensile material 10 Drilling hole 11 Ring 12 Friction resistor

Claims (3)

(57) [Claims] 1. An arc-shaped fixed body in which a plurality of retaining wall blocks each having an arc-shaped cross section whose middle portion protrudes toward a valley side against a slope are arranged side by side, and a middle portion protrudes toward a mountain side in embankment. Are installed side by side, and tension is applied so that they move between the retaining wall blocks facing each other and the fixed body while moving back and forth from the mountain side to the valley side, or vice versa. A retaining wall method in which a material is hung, connected endlessly, the retaining wall block and the fixed body are connected by a tensile material, and the fixed body and the tensile material are buried in the embankment. 2. The retaining wall method according to claim 1, wherein a plurality of endless tensile members are hung between the fixed body and the retaining wall block. 3. The retaining wall method according to claim 1, wherein a frictional resistor is provided on the crest side of the tensile member on the left and right in the vicinity of the fixed body.