JP2005282283A - Retaining wall structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retaining wall structure capable of easily and rigidly construction a retaining wall by reducing the excavated soil amount of a natural ground and increasing the stability of the retaining wall. <P>SOLUTION: An extension part 3 and a recessed part 4 are excavated in the natural ground 1, and the groove-shaped retaining wall 5 is constructed in the recessed part 4. The groove-shaped retaining wall 5 is integrally formed of a bottom board part 6 and side wall parts 7 and 8 in a upwardly opened reverse trapezoidal shape laterally symmetrical with each other in cross section. Namely, upwardly diverging gradients 9 are formed on the side wall parts 7 and 8 to reinforce the sloped surfaces by the side wall part 7 on the earth 1 side. The inside of the groove-shaped retaining wall 5 is filled with banking 14, and a road 2, for example, is laid down on the banking 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a retaining wall structure mainly built in a mountainous area.

Conventionally, as shown in FIG. 6, a retaining wall structure using an upright retaining wall 51 is known (Patent Document 1, etc.). The upright retaining wall 51 is formed in an L shape or an inverted T shape from the bottom plate portion 52 and the upright portion 53 by cast-in-place concrete, and is constructed on an overhang portion 55 obtained by excavating a natural ground 54 flat. A bank 56 is backfilled on the back side of the upright retaining wall 51, and a road 57 is laid on the bank 56.
JP-A-6-17435

However, the conventional retaining wall structure has the following problems.
(A) Since the upright retaining wall 51 stands up by its own weight and the earth and sand weight of the embankment 56 received by the bottom plate portion 52, the upright portion 53 is high and the bottom plate portion 52 is large (normally, the depth is the height of the retaining wall height). About 70 to 80%), and the amount of excavated soil in the back ground 54 is enormous.
(B) Since the retaining wall 51 is high, the work is difficult and the work efficiency is poor.

(C) Since the supporting surface of the retaining wall 51 with respect to the natural ground 54 is limited to only the bottom plate portion 52, the stability of the retaining wall 51 was low.
(D) For this reason, incidental work for reinforcing the slope of the overhang 55 was necessary.
(E) It was necessary to form the upright portion 53 thick so as to withstand the earth pressure of the embankment 56.
(F) Since the embankment 56 becomes high, reinforcement work was required for the embankment 56 so that the road 57 would not sink.

  The objective of this invention is providing the retaining wall structure which can solve the said subject, reduces the amount of excavated soil of a natural ground, raises the stability of a retaining wall, and can be built easily and firmly.

  In order to solve the above-mentioned problem, the retaining wall structure of the present invention is constructed by constructing a groove-shaped retaining wall having an open upper surface on the overhang portion of the natural ground, and filling the inside of the groove-shaped retaining wall with embankment, A slope of spreading upward (protruding toward the natural mountain) is provided on the side wall portion of the retaining wall on the natural mountain side, and the slope of the natural mountain is reinforced by the side wall portion.

  Here, the construction material of the grooved retaining wall is not particularly limited, but includes concrete, metal (steel, aluminum alloy, etc.), resin (organic fiber, inorganic fiber, carbon fiber, fiber reinforced resin, foamed resin, etc. ) Etc., and these can also be combined. For example, the main part of the groove-shaped retaining wall is constructed with concrete containing reinforcing reinforcing bars, and the part with insufficient strength is constructed with steel or supplemented with steel. In addition, when using concrete, although it can also construct by an in-situ construction method, it is preferable to use a precast concrete product for a channel-shaped retaining wall at the point which can shorten a construction period. In the case of precast, the grooved retaining wall may be an integrated structure that is easy to construct, or may be a split structure that is easy to carry on site.

  Although the gradient of the upward spread of the side wall on the natural mountain side is not particularly limited, it is preferably 45 ° to 85 °, more preferably 60 ° to 75 ° in terms of an angle from the horizontal plane. This is because if the gradient is less than 45 degrees, the influence of earth pressure due to embankment increases, and if it exceeds 85 degrees, the effect of reducing the pushing force due to earth pressure becomes smaller. Note that the side wall portion may have a straight cross-sectional shape or a cross-sectional curve shape, and the slope of the upward spread in the case of the cross-sectional curve shape may be considered as an average value or a center value, for example.

  The slope of the side wall portion on the valley side is not particularly limited, and may be, for example, an upward spread (projecting toward the valley) or vertical, but an upward spread is preferable in terms of the widening effect and weight balance due to the overhang. . The gradient is preferably 45 ° to 85 °, more preferably 60 ° to 75 °, expressed as an angle from a horizontal plane. The concept of the gradient in the case of a curved cross section is the same as described above.

  In addition, the groove-shaped retaining wall is not limited to a specific shape as long as the upper surface is open, but for example, it is formed in an inverted trapezoidal shape or a saddle-shaped cross-section in which both side walls are provided with an upwardly extending gradient. Can do. The cross-section inverted trapezoidal shape or cross-section saddle shape may be cross-sectionally symmetric (same gradient) or cross-sectionally asymmetric (slope is different). In the case of a saddle-shaped cross section, the side wall portions are curved in a cross-sectional curved shape that spreads upward, so the gradient is considered as described above.

  The retaining wall structure of the present invention is mainly intended to reinforce the natural ground, but since the inside of the groove-shaped retaining wall is buried with embankment, the embankment is used as a supporting ground, and flat land is placed on it. Can create. For example, roads, railroad rails, parks and green zones can be provided on the embankment.

  According to the retaining wall structure according to the present invention, the inner surface of the groove-shaped retaining wall is filled with embankment, and the slope of the natural ground is reinforced with the sloped side wall, so the amount of excavated soil in the natural ground is reduced. It has the excellent effect of increasing the stability of the retaining wall and making it easy and robust.

  A grooved retaining wall with an open upper surface is constructed on the overhang of the natural ground, the inside of the grooved retaining wall is filled with embankment, and an upward spreading gradient is provided on the side wall on the ground mountain side of the grooved retaining wall. Reinforce the slope of the natural ground by the part. The slope of the upward spread of the side wall portion on the natural mountain side is preferably 45 to 85 degrees in terms of the angle from the horizontal plane. The side wall on the valley side also preferably has an upwardly spreading gradient, and the gradient is preferably 45 to 85 degrees in terms of an angle from the horizontal plane. Examples of the shape of the groove-shaped retaining wall include an inverted trapezoidal cross section or a saddle-shaped cross section. Create flat land that can be used as roads on the embankment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG.1 and FIG.2, the retaining wall structure of this embodiment reinforces the natural ground 1 in a mountain part, and also creates a flat land (here road 2) on top. It is a structure that is built to run vertically on the mountainside. In the natural ground 1, the overhanging portion 3 and the recess 4 are formed by excavation work, and in the recess 4, a plurality of channel-shaped retaining walls 5, which are precast concrete products embedded with reinforcing reinforcing bars, are arranged in the groove length direction. In line with the mountainside, they are connected in series in a row and joined together.

  The groove-shaped retaining wall 5 is integrally formed from a bottom plate portion 6 and a pair of side wall portions 7 and 8 in an inverted trapezoidal shape in which the upper surface is opened, and a slope 9 is provided on both side wall portions 7 and 8 so as to spread upward. ing. The upper surface of the groove-shaped retaining wall 5 has a sufficient width for laying a road (roadway). The gradient is 60 degrees to 75 degrees in terms of an angle from the horizontal plane. The bottom plate portion 6 is formed thicker than the side wall portions 7 and 8, and is supported by the natural ground 1 through the base material 10 and the leveled concrete 11. The side wall 7 on the natural ground 1 side is supported by the natural ground 1 through the backfill 12, and the slope of the natural ground 1 is reinforced by the side wall 7. The lower half of the side wall 8 on the valley side is supported by the natural ground 1 via the backfill 12, and the upper half is exposed from the natural ground 1.

  The inside of the groove-shaped retaining wall 5 is buried with a bank 14 using excavated soil from the natural ground 1, and the road 2 is laid on the bank 14. Both side wall portions 7 and 8 are provided with drainage holes 15 for discharging the permeated water of the embankment 14. On the outside of the side wall 7 on the natural ground 1 side, a gutter 16 is constructed at the same height as the road 2. A hole 19 for standing the pole 18 of the guard rail 17 is provided at the upper end of the side wall portion 8 on the valley side.

According to the retaining wall structure having the above configuration, the following operational effects can be obtained.
(A) The natural ground 1 can be reinforced by the groove-shaped retaining wall 5, and the road 2 can be laid using the embankment 14 in which the retaining wall 5 is buried as a supporting ground. Moreover, since both the side wall parts 7 and 8 are the upward spread gradient 9, the widening effect of the road 2 by overhang | projection is large.
(B) Since a precast concrete product is used for the grooved retaining wall 5, the construction is simple and the construction period can be shortened.

(C) Since the grooved retaining wall 5 is self-supporting due to its own weight including the earth and sand weight of the embankment 14, the bottom plate portion 6 is made small and the side wall portions 7 and 8 are made low so It can be greatly reduced.
(D) Since the retaining wall 5 becomes low, the overhang | projection part 3 and the recess 4 can be excavated safely and efficiently.
(E) Since the excavation range of the natural ground 1 becomes small, the retaining wall construction site can be minimized.

(F) Since the groove-shaped retaining wall 5 is supported by the natural ground 1 with a large area of the bottom plate portion 6 and the side wall portions 7 and 8, the stability of the retaining wall 5 can be increased.
(G) Since the retaining wall 5 is formed in an inverted trapezoidal shape having a symmetrical cross section, the weight balance is good and the stability of the retaining wall 5 is increased.
(H) Since the retaining wall 5 is self-supporting and stable on the overhanging portion 3, no additional work for reinforcing the slope of the overhanging portion 3 is required.

(I) Since the upward spreading gradient 9 is provided on the side wall 7 on the natural ground 1 side, the pushing force due to earth pressure is reduced, and the groove-shaped retaining wall 5 is firmly installed on the overhanging portion 3. Can do.
(J) Since the inside of the retaining wall 5 is buried with the embankment 14, the thickness of each part of the retaining wall can be reduced, and the entire structure can be configured firmly.
(K) Since the bottom plate portion 6 supports the embankment 14 at a shallow position, the embankment 14 is less likely to sink, and the depression of the road 2 can be prevented without special reinforcement work.

The present invention is not limited to the above-described embodiment. For example, the present invention can be appropriately modified and embodied as follows without departing from the spirit of the invention.
(1) As shown in FIG. 3, the groove-shaped retaining wall 21 is formed in a symmetrical shape in cross section and a curved surface gradient 24 is provided on the curved side walls 22 and 23.
(2) As shown in FIG. 4, the groove-shaped retaining wall 26 is formed in an inverted trapezoidal shape that is asymmetric in cross section, and a slope 28 is provided only on the side wall 27 on the ground 1 side, and the side wall 29 on the valley side is erected. The protective wall 30 is integrally formed on the upper part.
(3) As shown in FIG. 5, the grooved retaining wall 32 is divided into three parts, one base plate 33 made of precast concrete and two side wall plates 34, 35, so that it can be easily carried into the site. Integrate together with bolts 36 on site.
(4) The groove-shaped retaining wall is divided into two in the width direction at the bottom plate portion.

It is a perspective view showing one embodiment of a retaining wall structure concerning the present invention. It is a longitudinal cross-sectional view of the retaining wall structure. It is a longitudinal cross-sectional view which shows the example of a change of the retaining wall structure based on this invention. It is a longitudinal cross-sectional view which shows another example of a change of the retaining wall structure which concerns on this invention. It is a disassembled perspective view which shows the example of a change of a channel shape retaining wall. It is a longitudinal cross-sectional view which shows the conventional retaining wall structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Natural mountain 2 Road 3 Overhang | projection part 5 Channel-shaped retaining wall 7 Side wall part 8 Side wall part 9 Gradient 14 Filling 21 Channel-shaped retaining wall 22 Side wall part 23 Side wall part 24 Curved surface 26 Channel-shaped retaining wall 27 Side wall part 28 Gradient 29 Side wall Part 32 Channel retaining wall

Claims (4)

  A grooved retaining wall with an open upper surface is constructed on the overhanging part of the natural ground, the inside of the grooved retaining wall is filled with embankment, and an upward spreading gradient is provided on the side wall on the ground mountain side of the grooved retaining wall. Retaining wall structure characterized by reinforcing the slope of the natural ground with a part.   The retaining wall structure according to claim 1, wherein the groove-shaped retaining wall has an inverted trapezoidal cross section.   The retaining wall structure according to claim 1 or 2, wherein the groove-shaped retaining wall has a bowl shape in cross section.   The retaining wall structure according to claim 1, 2 or 3, wherein a flat land is created on the embankment.

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