JP5008770B2 - Retaining wall embankment structure - Google Patents

Description

  The present invention relates to a retaining wall embankment structure in which embankment work and retaining wall work are repeated, and a side surface of the embankment body is covered with a plurality of retaining wall blocks.

A tail arme method is widely known in which a strip-shaped steel reinforcement (strip) is laid in the embankment, a reaction force is obtained by the friction effect between the soil and the strip, and the retaining wall block to which the strip is connected is supported.
The strip is made of galvanized flat steel with ribs, which has excellent durability and high frictional force, and is connected to the back of the retaining wall block by bolts and nuts.
In addition, embankment work is also known in which the geogrid is buried in the embankment while the geogrid is directly connected to the back of the retaining wall block.

JP 2005-97842 A

The above-described embankment structure has the following problems.
(1) Since the material of the strip is metal, there is a problem that the strip is damaged by rust in the embankment.
Furthermore, there is a problem that the bolts and nuts used as the connecting means between the strip and the retaining wall block also corrode, and the connecting portion of the strip may break.
(2) Since the main function of the strip is to prevent the retaining wall block from coming out, there is concern about the stability of the embankment.
In particular, since the strip cannot sufficiently restrain the displacement of the embankment, the slope side of the embankment body is deformed into an uneven shape due to an earthquake, and the embankment body is liable to collapse.
(3) The embedded height of the strip is limited to the embedded height of the retaining wall block, and there is an inconvenience that the embedded height of the strip cannot be freely selected.
(4) In the embankment structure in which the geogrid is directly connected to the back surface of the retaining wall block, the rigid retaining wall block and the flexible geogrid are directly connected.
Therefore, there is a problem that a large stress is concentrated on the connecting portion and is easily broken.
In addition, since the geogrid is connected to the back of the retaining wall block using a metal connector, the problem of corrosion of the connector remains.
Furthermore, in the embankment structure in which the wall block and the geogrid are directly connected, the rigid wall block cannot follow the natural consolidation deformation of the soft back reinforcement embankment, and the wall block passes through the geogrid that sinks with the reinforcement embankment. The problem that is pulled to the embankment side is pointed out.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a retaining wall embankment structure excellent in durability.
The objective of this invention is providing the retaining wall embankment structure which can improve the stability of a reinforcement embankment and a retaining wall block significantly.
An object of the present invention is to provide a retaining wall embankment structure excellent in earthquake resistance.
The present invention is to provide any one of the above.

  In order to achieve the above-described problems, the first invention of the present application is a retaining wall embankment structure in which a side surface of a banking body is stacked and covered with a plurality of retaining wall blocks, and each retaining wall block is integrally formed on the back surface thereof. And having a plurality of connection holes along the height direction on the back surface of the connection part, and a fiber in any one of the plurality of connection holes selected alternatively Connected to an arbitrary height by inserting a mesh belt belt made of, embedded in the embankment body constructed by embankment on the back of the retaining wall block, embed the belt belt connected to the retaining wall block in the embankment body, A sheet-like geogrid is laid on the embankment body, and the displacement of each retaining wall block is constrained via a fiber belt embedded in the embankment body.

  According to a second invention of the present application, in the first invention described above, a belt belt having continuity is laid in a corrugated shape across the connecting portions on the back surface of the plurality of retaining wall blocks arranged in the lateral direction and the embankment body. The corrugated portion of the belt belt extending from the back of the wall block is embedded in the embankment body.

  According to a third invention of the present application, in the second invention described above, a rigid resistor is engaged across a plurality of folded portions of the corrugated portion of the belt belt, and the resistor is attached together with the plurality of folded portions of the belt belt. It is characterized by being buried in the embankment.

According to a fourth invention of the present application, in any one of the first to third inventions of the present application, the side surface of the embankment body is formed vertically, and the retaining wall block is vertically stacked along the side surface of the embankment body. And
According to a fifth aspect of the present invention, in any one of the first to third aspects of the present invention, the side surface of the embankment body is formed with a predetermined gradient, and the retaining wall block is inclined along the side surface of the embankment body. It is characterized by being piled up.

The present invention can obtain at least one of the following effects.
(1) Since the belt belt connected to the back surface of the retaining wall block is made of fiber, there is no risk of damage or breakage due to rust, and the retaining wall block can be supported semi-permanently.
(2) By constructing the embankment body using the restraint sheet and geogrid in combination, the embankment body stability is increased, it is excellent in earthquake resistance, and deformation over time can be minimized, and the retaining wall The earth pressure acting on the block can be reduced and the stability of the retaining wall block can be improved.
(3) Since the connection position of the belt belt connected to the back surface of the retaining wall block can be arbitrarily selected, the belt belt can be attached to any height regardless of the laying pitch of the geogrid.
Further, by increasing the number of belt belts connected to the retaining wall block, it is possible to further enhance the effect of preventing the retaining wall block from coming out.
(4) The geogrid is not connected to the retaining wall block.
Therefore, even if the embankment body is naturally consolidated, the problem that the retaining wall block is pulled toward the embankment via the geogrid can be solved.
(5) In addition to vertical construction of retaining wall blocks, it is possible to construct retaining walls with a slope that has been difficult to construct.
(6) The retaining wall block can be effectively prevented from popping out and displaced, and high stability can be ensured for the entire retaining wall embankment structure.

Vertical section of retaining wall embankment structure according to reference example The perspective view which connected the belt belt to the back of the retaining wall block which comprises a single connection part The perspective view which connected the belt belt to the back of the other retaining wall block which comprised a plurality of connecting parts. Explanatory drawing of construction method of retaining wall embankment structure The top view which showed the form which connected the single belt belt for every connection part of the back of a retaining wall block The top view which showed the connection form of the other belt belt which connected the continuous belt belt to the some connection part of the back of a retaining wall block The top view which showed the connection form of the other belt belt which has arranged the belt belt connected to the back of the retaining wall block in the waveform The connection form of other belt belts showing a form in which a continuous belt belt is connected to a plurality of connecting portions on the back surface of the retaining wall block and a resistor is locked across a plurality of folded portions of the belt belt is shown. Plan view The perspective view which fractured | ruptured a part of retaining wall embankment structure based on the Example of this invention, and was seen from the embankment body side The longitudinal cross-sectional view which abbreviate | omitted some retaining wall embankment structures which concern on an Example

Hereinafter, the present invention will be described with reference to the drawings.
[Reference example]

(1) Outline of Retaining Wall Embankment Structure FIG. 1 shows a cross-sectional view of the retaining wall embankment structure 10.
This retaining wall embankment structure 10 is divided into a plurality of times to the finished height while rolling, and the embankment body 20 is constructed by stacking the embankment layers 20a, 20b,... And the side surface of the embankment body 20 ( A plurality of retaining wall blocks 30 that are arranged in the vertical and horizontal directions on the slope and cover the side surface (slope) of the embankment body 20, and are connected to the back surface of each retaining wall block 30, and each embankment layer 20 a, 20 b,. It is comprised by the single or several belt belt 40 embed | buried under.
The main materials are described in detail below.

(2) Retaining wall block An example of the retaining wall block 30 which covers the side surface of the embankment 20 is shown in FIGS.
The retaining wall block 30 is a block made of precast concrete and has an overall shape of a quadrangle, and a connecting portion 31 protruding along the vertical direction is integrally formed on the back surface thereof.
FIG. 2 shows a case where a cross-section T-shaped with a connection portion 31 formed at the center of the back surface of the retaining wall block 30 is shown, and FIG. The case where a cross-sectional square shape is exhibited is shown.
A plurality of connection holes 32 are formed through the connection portion 31 along the height direction. Although this example shows an example in which the connection holes 32 are formed at the upper, middle, and lower portions of the connection portion 31, the number of connection holes 32 may be arbitrary.
The plurality of connection holes 32 are holes for connecting the belt belt 40 to an arbitrary height.
In addition, although this example demonstrates the case where the shape seen from the front of the retaining wall block 30 is a rectangle, as other shapes seen from the front of the retaining wall block 30, polygons, such as a pentagon and a hexagon, are mentioned, for example. Can be adopted.

(3) Belt Belt One of the belt belts 40 is connected to the retaining wall block 30 and the other side is embedded and used in the embankment body 20, and the retaining wall is utilized using frictional resistance with the embankment body 20. It functions to constrain the displacement of the block 30.
In contrast to the conventional strip made of metal, in the present invention, the belt 40 is formed of a flexible material having excellent tensile strength and corrosion resistance.

As a material of the belt belt 40, for example, high-strength fibers used for car seat belts, or a material obtained by processing the surface of a fibrous belt with resin to improve impact resistance and weather resistance can be used.
Moreover, the preferable form of the belt belt 40 is desirably an opening structure configured in a mesh shape so that the pulling resistance is increased due to the interlocking effect between the earth and sand and the belt belt 40.
As other forms of the belt belt 40, a flat belt having a non-porous structure or an uneven surface formed on the surface of the belt may be used.

When the belt belt 40 is inserted into the connection hole 32 of the connection portion 31 of the retaining wall block 30, as shown in FIGS. It is possible to effectively prevent cutting at the edge of the connection hole 32 of the block 30.
Further, since the supporting force of the retaining wall block 30 is proportional to the total length of the belt belt 40, the total length of the belt belt 40 is appropriately selected according to the site.

(4) Construction method of retaining wall embankment structure Next, the construction method of retaining wall embankment structure 10 is demonstrated.

[Foundation]
As shown in FIG. 4, excavation is performed with a backhoe or the like based on the construction plan, and the crushed stone layer 50 is laid at a position where the retaining wall block 30 is to be stacked, and then the foundation concrete 51 is placed on the crushed stone layer 50.

[Installation of retaining wall block]
Next, the first-stage retaining wall blocks 30 are arranged side by side on the foundation concrete 51.
In this example, a case where the retaining wall blocks 30 are stacked with a predetermined gradient will be described, but they may be stacked vertically.

[Band belt connection]
Among the plurality of connection holes 32 formed in the connection portion 31 of the retaining wall block 30, the belt belt 40 is inserted into and connected to the connection hole 32 having a predetermined height.
The belt belt 40 connected to the rear surface side of the retaining wall block 30 is laid so that the ground on the rear surface side of the retaining wall block 30 is not slack.

[Filling work]
The first embankment layer 20a is constructed by rolling and rolling earth and sand on the back side of the retaining wall block 30 until the belt belt 40 is hidden.
In this example, the first embankment layer 20a is constructed on the belt belt 40 connected to the lowermost connection hole 32 to embed the belt belt 40, and the uppermost connection hole is formed on the upper surface of the first embankment layer 20a. 32, the belt belt 40 connected to the retaining wall block 30 is laid, but the connection position of the belt belt 40 with respect to the retaining wall block 30 and the number of belt belts 40 are appropriately selected in consideration of the supporting force of the retaining wall block 30. And
In short, the belt belt 40 connected to the back surface of the retaining wall block 30 may be embedded in the embankment layer.

  Further, the belt belt 40 can be connected simply by inserting the belt belt 40 into an arbitrary connection hole 32 formed in the connection portion 31 of the retaining wall block 30. Therefore, it is necessary to use a special connector. There is no.

The embedding form of the belt belt 40 connected to the connection part 31 of the retaining wall block 30 is illustrated in FIGS.
The left side of FIG. 5 shows a case where both ends of the belt belt 40 having a predetermined length intersect the connecting portion 31 of the retaining wall block 30, and the right side of FIG. The case where it is buried without crossing is shown.

Further, a belt belt 40 having a long length is laid in a corrugated shape (zigzag) between the connection portions 31 of the plurality of retaining wall blocks 30 arranged in the horizontal direction in FIG. The case where the corrugated part of the belt belt 40 extending from the back surface of the block 30 is embedded in the embankment 20 is shown.
FIG. 7 shows a form in which both ends of a single belt belt 40 connected to the connection portion 31 of each retaining wall block 30 are crossed, and pins 43 are placed at the crossing portion to give continuity to the belt belt 40. .

  6 and 7, when the corrugated portion of the belt belt 40 laid in a waveform (zigzag shape) is embedded in the embankment body 20, not only the frictional resistance caused by the earth pressure of the embankment body 20 but also the corrugated portion of the folded belt belt 40 As a result, a mass resistance due to surrounding a portion of the embankment body 20 is added, so that the supporting force of the retaining wall block 30 is higher than that in FIG.

FIG. 8 shows a case where the rigid resistor 42 is locked over a plurality of folded portions forming the corrugated portion of the belt belt 40 having continuity shown in FIGS.
Since the support force of the retaining wall block 30 is further increased by the addition of the resistor 42 as shown in FIG. 8, even if the embedding depth of the belt belt 40 toward the back side of the retaining wall block 30 is set short, the retaining wall block 30 is retained. The wall block 30 can be supported with high supporting force.

  When the first-stage construction is completed, the second-stage retaining wall block 30 and the second layer are formed on the upper surfaces of the first-stage retaining wall block 30 and the first-layer embankment layer 20a as shown by the two-dot chain lines in FIG. The embankment layer 20b is laminated and constructed.

  The belt belt 40 is also connected to the back surface of the second-stage retaining wall block 30, and the belt belt 40 is embedded in the second embankment layer 20b in the same manner as described above.

The retaining wall block structure shown in FIG. 1 is obtained by repeating the above-described installation work of the retaining wall block 30, connection laying work of the belt belt 40, and embankment as many times as necessary.
Since the belt belt 40 can be connected to the connecting portion 31 on the back surface of the retaining wall block 30 at an arbitrary height and buried, the height of the belt belt 40 connected to the retaining wall block 30 is set to the embankment layers 20a, 20b,. The layer thickness (pitch thickness) is not limited.
In each stage of the retaining wall block 30, the supporting force of the retaining wall block 30 increases in proportion to the number of belt belts 40 connected to the retaining wall block 30.

(5) Characteristics of Retaining Wall Embankment Structure As shown in FIG. 1, in the retaining wall embankment structure 10, the slope side of the embankment body 20 is covered with a retaining wall block 30.
The belt belt 40 is supported by receiving frictional resistance due to earth pressure acting in the vertical direction of the embankment body 20, and each retaining wall block 30 is supported via the belt belt 40.
Therefore, the earth pressure acting on the side of the embankment body 20 is supported by the embankment body 20 via each retaining wall block 30 and the belt belt 40.
Further, since the belt belt 40 has appropriate flexibility, the belt belt 40 can follow the deformation of the banking body 20 without breaking even if the banking body 20 is deformed by consolidation.
Furthermore, since the belt belt 40 is formed of a material having excellent corrosion resistance, the belt belt 40 is completely free from the risk of breakage due to rust throughout its entire length, and the retaining wall block 30 is supported semi-permanently. The function can be sustained.

[Example]
Examples according to the present invention will be described below. In the following description, the same parts as those of the reference example described above are denoted by the same reference numerals, and detailed description thereof is omitted.

(1) Structure of retaining wall embankment structure FIGS. 9 and 10 are based on the retaining wall embankment structure 10 of the reference example described above, and a sheet-like geogrid laid horizontally in the embankment body 20 and embedded therein. The other form which adds and uses 70 is shown.

(2) Additional materials used in this example First, the geogrid 70 used in this example will be described.

[Geogrid]
The geogrid 70 is a sheet material that is horizontally embedded in the embankment body 20 and reinforces the embankment body 20, for example, a high-density polyethylene lattice net, an aramid fiber core material, and a high-density polyethylene film. “Adem” (manufactured by Maeda Kosen Co., Ltd.) formed in a net shape by covering is suitable.

(3) Construction method Repeating the installation work of the retaining wall block 30, the connecting and laying work of the belt belt 40, and the banking work is the same as the reference example described above, but this example is banking compared with the reference example. The construction differs in that the sheet-shaped geogrid 70 described above is embedded in the embankment 20 at an arbitrary height.

  That is, in the present embodiment, the slope side of each embankment layer 20a, 20b, 20c... In the process of connecting the belt belt 40 to the retaining wall block 30 and embedding it in each embankment layer 20a, 20b, 20c. When the auxiliary formwork unit 60 and the restraint sheet 90 are laid on the inner side of the auxiliary formwork unit 60 for embedding, and the embankment for one span (full height) of the retaining wall block 30 is performed in multiple times. In addition, a step of laying and burying the geogrid 70 at an arbitrary height of the embankment is added to the reference example.

The geogrid 70 is not directly connected to the retaining wall block 30.
Therefore, the embedding pitch of the geogrid 70 with respect to the embankment body 20 can be arbitrarily set in consideration of the soil quality and embankment height of the embankment body 20 regardless of the height of the retaining wall block 30.

  In this example, the belt belt 40 that supports the retaining wall block 30 and the geogrid 70 that reinforces the embankment body 20 are illustrated in such a manner that the embedded positions do not overlap each other. Of course, it may be.

(4) Characteristics of Retaining Wall Embankment Structure As shown in FIG. 9, the retaining wall embankment structure 10 according to the present embodiment is a embankment body using the geogrid 70 and the restraint sheet 90 in addition to the effects of the reference example. By constructing 20, the stability of the embankment body 20 is remarkably improved as compared with the reference example, and the earthquake resistance is also excellent.
Furthermore, by embedding the geogrid 70, the temporal deformation of the embankment body 20 can be suppressed to a minimum.
As the stability of the embankment body 20 increases as described above, the earth pressure acting on the retaining wall block 30 can be reduced, and the stability of the retaining wall block 30 can be finally improved.

DESCRIPTION OF SYMBOLS 10 ... Retaining wall embankment structure 20 ... Embankment body 30 ... Retaining wall block 31 ... Connection part 40 ... Belt belt 60 ... Auxiliary formwork unit 70 ... Geogrid

Claims (5)

A retaining wall embankment structure in which a plurality of retaining wall blocks are stacked and covered on the side of the embankment body,
The retaining wall block has a connection portion protruding along the vertical direction by integral molding on the back surface thereof, and has a plurality of connection holes along the height direction on the back surface of the connection portion,
Connected to any height by inserting a mesh belt belt made of fiber into any of the plurality of connection holes selected alternatively,
In the embankment body constructed by embankment on the back of the retaining wall block, the belt belt connected to the retaining wall block is embedded,
A sheet-shaped geogrid is laid on the embankment,
It is characterized by restraining the displacement of each retaining wall block through a belt belt made of fiber embedded in the embankment body,
Retaining wall embankment structure.   In Claim 1, the belt | belt which laid in the waveform the belt belt which has continuity across the connection part and embankment body of the back surface of the some retaining wall block arranged in the horizontal direction, and extended from the back surface of the retaining wall block Retaining wall embankment structure characterized by burying corrugated part of belt in embankment body.   In claim 2, the rigid resistor is locked across a plurality of folded portions of the corrugated portion of the belt belt, and the resistor is embedded in the embankment body together with the plurality of folded portions of the belt belt. Retaining wall embankment structure.   The retaining wall embankment structure according to any one of claims 1 to 3, wherein a side surface of the embankment body is formed vertically, and retaining wall blocks are vertically stacked along the side surface of the embankment body. body.   In any 1 item | term of Claim 1 thru | or 3, The side surface of the embankment body was formed providing the predetermined | prescribed gradient, and the retaining wall block was inclined and piled up along the side surface of this embankment body, Retaining wall embankment structure.

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