JP2000096584A - Steel-made earth retaining wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel-made earth retaining wall having strong points such as less use of steel material and excellent executable property without needing any form worker and crane. SOLUTION: An interval is provided in the width direction of a retaining wall on a retaining wall setting ground existing on the root of a slope, and a cylindrical form 4 for joining a plurality of circular arc liner plates 9 in the circumferential direction and the height direction is arranged. Concrete is placed in the cylindrical form 4 to form a concrete column 6. Plural stages of circular arc wall face materials 7 are spanned between the adjacent columns 6. Soil and sand are back-filled among the wall face material 7, the cylindrical form 4 and the slope to obtain a steel-made earth retaining wall. Large scaled excavation is not needed. The use material is lightweight material such as the liner plate and the wall face material, a crane is not needed, and transportation of use equipment and material is easy. The cylindrical form 4 is assembled by bolts, and a skilled person such as a form worker is not needed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gravity-type steel earth retaining wall.

[0002]

2. Description of the Related Art A retaining type retaining wall has a gravity type, which is a type that resists earth pressure by its own weight, and a cantilever type, a type that uses the own weight of soil on a heel plate to stabilize the retaining wall. There is a stay wall type in which a stay wall is added to the above-mentioned cantilever type, and these are generally constructed of unreinforced concrete or reinforced concrete. This concrete retaining wall requires complicated work, construction time is long, and requires a skilled worker such as a formwork in the case of a construction method in which a concrete form is put in place and concrete is put on site. . In addition, special foundation works such as crushed stone foundation are required in consideration of uneven settlement. In addition, in the case of the construction method in which a concrete retaining wall member manufactured in advance in a factory is brought into the site and assembled, since the concrete retaining wall member is heavy, it is not easy to carry it into a mountain or the like where a road is not maintained, In addition, heavy equipment is required during construction.

In order to improve the poor workability of the concrete retaining wall as described above, a steel frame structure is assembled on site by bolting steel materials, and a screen material is provided on a surface around the steel frame structure. There is also known a construction method in which a filling material is attached and a filling material such as earth and sand or rubble stone is filled therein (Japanese Patent Application Laid-Open No. 58-58).
-117136 etc.).

[0004] In addition, a steel column such as an H-section steel is driven into the ground at intervals, and this steel column is attached to an anchor separately driven into the ground, and an arc-shaped earth receiving plate is bridged between the steel columns. A law has also been proposed.
36548).

[0005]

Among the above-mentioned conventional construction methods, the concrete earth retaining wall requires complicated work, requires a long construction time, requires a skilled worker such as a formwork, or has a problem in transportation. There are drawbacks such as the need for heavy machinery. In addition, earth retaining retaining walls made of steel frame structure have improved workability compared to concrete earth retaining walls, but it is desirable that they can be constructed more easily. Since it is installed, more steel materials are used. Further, the earth retaining wall formed by the steel strut, the earth receiving plate, and the anchor requires the steel strut and the anchor to be driven sufficiently deep, and the driving thereof is not always easy and may be extremely difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and requires no technical work such as a formwork, does not require heavy machinery, is excellent in workability, and requires less steel material. An object of the present invention is to provide an earth retaining wall and a method of constructing a steel retaining wall.

[0007]

Means for Solving the Problems The steel earth retaining wall of the present invention which solves the above-mentioned problems is formed on a retaining wall installation ground existing at the base of a slope with a space in the width direction of the retaining wall. A cylindrical form formed by joining a plurality of arc-shaped liner plates in a circumferential direction and a height direction is arranged, and concrete is cast into the cylindrical form to form a concrete column, and the adjacent concrete Multiple arc-shaped wall materials are spanned between pillars,
It is characterized by being constructed by backfilling earth and sand between the wall material and the cylindrical formwork and the slope.

According to a second aspect of the present invention, in the steel retaining wall of the first aspect, a mounting plate is sandwiched between circumferentially joined portions of the liner plate, and the wall material is mounted on the mounting plate. .

According to a third aspect of the present invention, in the steel retaining wall according to the first aspect, a cylindrical form is formed by using four liner plates, and one liner plate is disposed so as to face the side of the slope. In addition, an anchor for reinforcement is driven into the slope ground from the liner plate.

According to a fourth aspect of the present invention, the mounting plate of the steel earth retaining wall according to the second aspect is arranged such that the mounting plate is 45 ° in a direction perpendicular to the retaining wall.
° is characterized.

A fifth aspect of the present invention relates to a method of constructing a steel retaining wall for constructing a steel retaining wall according to the third aspect, wherein the one liner plate according to the third aspect is provided. Is arranged first, and after anchor rods are driven in from the liner plate, the remaining liner plates are assembled to form a cylindrical form.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to the steel earth retaining wall 1 of one embodiment shown in FIG. FIG. 1 shows a steel retaining wall 1 according to one embodiment of the present invention.
2 is a front view, and FIG. 3 is a sectional view taken along line AA of FIG. 1 (however, illustration of backfilled earth and sand is partially omitted). As shown in these figures, the steel earth retaining wall 1 is spaced apart from the retaining wall installation ground 3 existing at the base of the slope 2 in the width direction of the retaining wall (in the horizontal direction in FIGS. 1 and 2). The cylindrical form 4 is formed by joining a plurality of arc-shaped liner plates 9 (not shown in FIGS. 1 and 3) in the circumferential direction and the height direction. A concrete column 6 is formed by casting concrete 5 into the concrete column 4, a plurality of arc-shaped wall members 7 are bridged between adjacent concrete columns 6, and the wall member 7 and the cylindrical form 4 are sloped with the side walls. It is constructed by backfilling earth and sand 8 between the two.

The liner plate 9 is shown in FIG.
As shown in (b) and (c), both side edges of the corrugated sheet 9a are bent at right angles to form flanges 9b, plates 9c are fixed to both ends by welding, holes 9d for joining are made, and the plates are curved in an arc shape. Configuration. In this embodiment, as shown in FIG. 4, four liner plates 9 are connected in the circumferential direction to form a cylinder, and these are connected in the height direction in the illustrated example, for example, in seven stages to form the cylinder. Forming frame 4 is formed.

As shown in FIGS. 4 and 5, the wall material 7 has a flat bar 13 welded and fixed to the upper edge and the left and right edges of an elongated rectangular expanded metal 12. An ear plate 14 having a bolt connection hole is fixed to the bar 13 by welding.

In this embodiment, the cylinder is formed by the four liner plates 9 as described above. One of the liner plates 9 (shown by 9 (A) in FIG. Facing the side. The mounting plate 16 is sandwiched between circumferentially joined portions of the liner plate 9 (A), and the left and right ear plates 14 of the wall material 7 are connected to the mounting plate 16 by bolts. Therefore, the position of the mounting plate 16 is at 45 ° to a direction perpendicular to the retaining wall. If the mounting angle of the mounting plate 16 is 45 °, the structure is such that the concrete column 6 bears the earth pressure acting on the wall member 7, so that the concrete column 6 side (the cylindrical form 4 side) also faces the wall member 7. It does not cause excessive force action.

Next, a method of constructing the steel earth retaining wall 1 will be described. Steel retaining wall 1 of the present invention
Is suitable in the case where the flat retaining wall installation ground 3 exists at the base of the slope 2 as in this embodiment, that is, when the slope suddenly changes from the flat ground. Usually, at least a portion of the cylindrical form 4 excavates the slope 2 into a semicircular concave shape. However, as in the conventional case, shaping of the slope to make it a continuous wall is unnecessary, and the amount of excavation is extremely small. No heavy equipment such as backhoes related to excavation is required. However, some excavation and leveling to form the retaining wall installation ground 3 are necessary. In this embodiment, as shown in FIG. 3, since the concrete column 6 is inclined toward the slope 2, the retaining ground installation ground 3 is slightly inclined accordingly.

When disposing the cylindrical formwork 4 on the retaining wall installation ground 3, first, only the liner plate 9 (A) facing the slope 2 is disposed. In the illustrated example, the liner plate 9 (A) facing the slope 2 is connected in seven steps in the height direction. Next, at appropriate locations in the height direction (two locations in the illustrated example), the liner plate 9
The anchor 10 is driven from the anchor hole of (A), and the liner plate 9 (A) is connected to the anchor 10. This work is a work in a state where the cylindrical form 4 is not formed again, and since the vicinity of the retaining wall installation ground 3 is vacant as a large space, this work is extremely easy.

Next, the remaining three liner plates 9 for forming the cylinder are connected in the circumferential direction and in the height direction to form the above-mentioned cylindrical form 4. This rest 3
Since the operation of connecting the two liner plates 9 to form a cylinder can be performed outside the cylinder, this operation is also easy.

After arranging the cylindrical forms 4 at necessary places with an interval, concrete 5 is poured into the cylindrical forms 4. Next, the ear plates 14 at both ends of the wall member 7 are connected to the mounting plates 16 of the left and right cylindrical forms 4 by bolts. This operation is performed over seven stages in the illustrated example.

Although the flat bar 13 is not attached to the lower edge of the expanded metal 12 in the illustrated example of the wall material, that portion fits inside the flat bar 13 at the upper edge of the lower wall material 7. Further, since the wall material 7 is made of expanded metal 12, a mat for preventing earth and sand from leaking from the mesh is attached to the back surface of the wall material 7. If the mat for preventing earth and sand leakage is a mat with seeds, or the seeds are sprayed after construction, the steel retaining wall 1 can be greened.

Next, the earth and sand 8 is buried between the back surface of the wall material 7 and the cylindrical form 4 and the slope 2. Thus, the steel earth retaining wall 1 is constructed. This steel earth retaining wall 1
Is a gravity type retaining wall, which resists the earth pressure acting on the wall material 7 and the concrete column 6 by the weight of the concrete column 6.

According to the steel retaining wall 1 described above, a formwork (cylindrical formwork 4) for the concrete column 6 can be constructed by bolting the liner plate 9 to a special form such as a formwork. No technician is required. In addition, even if uneven settlement occurs after the construction, the wall material 7 between the concrete columns 6 easily follows the uneven settlement, so that the retaining wall installation ground 3 such as a crushed stone foundation in consideration of uneven settlement is used. It is not necessary to perform a basic foundation work.

Further, since the liner plate and wall material of the used material are lightweight, it is easy to carry the used material to the site, which is extremely advantageous for construction in mountainous areas where roads are not maintained. Extensive excavation using heavy equipment such as a backhoe is not required, and this is also advantageous for construction in mountainous areas.

The ground 3 on which the retaining wall is installed is the cylindrical form 4 and the wall 7, but the space for the wall 7 can be reduced. Excavation or leveling work is also easy. In addition, an expanded metal 1 is provided between the cylindrical forms 4 arranged at an interval.
Since only the wall material 7 such as 2 is used, the amount of steel material used can be reduced as compared with the conventional steel retaining wall having a steel frame structure.

Further, the anchor 18 in the above embodiment is used.
Is an auxiliary member when the weight of the concrete column 6 as a weight body in the gravity type retaining wall is insufficient (when the height of the concrete column 6 is suppressed).
Does not need to be driven too deep into the slope ground. Therefore, unlike the conventional retaining wall including the steel strut, the earth receiving plate, and the anchor, there is no difficulty associated with the need to drive the steel strut and the anchor sufficiently deep.

In the present invention, the wall material is not limited to expanded metal, but may be a wire mesh, a welded wire mesh, or the like. When these are used, a synthetic resin net can also be used as the net material.

[0027]

According to the steel earth retaining wall of the present invention, since a formwork for a concrete column can be constructed by bolting, a special technician such as a formwork is not required. Further, since the wall material between the concrete columns can easily follow the uneven settlement, it is not necessary to perform a special foundation work such as a crushed stone foundation in consideration of the uneven settlement.

Further, since it can be constructed with lightweight materials such as a liner plate and a wall material, and no heavy equipment is required, it is easy to carry the used equipment to the site, and the construction is carried out in a mountain where roads are not maintained. Is extremely advantageous.

Further, since it is sufficient to excavate or level the portion of the cylindrical formwork and the portion of the wall material, the range is narrow.
Excavation or leveling work is easy. In addition, since the space between the cylindrical forms arranged at intervals is a lightweight wall material,
Compared with the conventional steel retaining wall having a steel frame structure, the amount of steel used can be reduced.

Also, when an anchor is provided on a concrete column, the anchor is an auxiliary to the weight of the concrete column and does not need to be driven into the slope ground so deeply. Unlike the retaining wall made of steel and anchors, there is no difficulty associated with driving steel columns or anchors.

According to a second aspect of the present invention, when the mounting plate for mounting the wall material is sandwiched between the circumferentially joined portions of the liner plate, the mounting structure of the wall material is extremely simplified, and the mounting operation is easy. It is.

According to the third and fifth aspects, when assembling the cylindrical form, it is not necessary to perform the work inside the cylinder, so that the work of assembling the cylindrical form is facilitated.

According to the fourth aspect, the structure in which the concrete column bears the earth pressure acting on the wall material does not generate an excessive force on the concrete column side or the wall material side.

[Brief description of the drawings]

FIG. 1 is a plan view of a steel earth retaining wall according to an embodiment of the present invention.

FIG. 2 is a front view of the steel earth retaining wall shown in FIG. 1;

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

FIG. 4 is an enlarged plan view showing details of a steel member in FIG. 1;

5A is a developed front view of one wall member in FIG. 4, and FIG. 5B is a front view of a mounting plate.

6A and 6B show details of a liner plate used for the steel earth retaining wall, wherein FIG. 6A is a plan view, FIG. 6B is a front view, and FIG. It is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel retaining wall 2 Slope 3 Retaining wall installation ground 4 Cylindrical formwork 5 Concrete 6 Concrete pillar 7 Wall material 8 Earth and sand 9 Liner plate 9 (A) Liner plate facing slope side 10 Anchor 12 Expanded metal 13 Flat bar 16 Mounting plate

Claims (5)

[Claims] 1. A cylinder formed by joining a plurality of arc-shaped liner plates in a circumferential direction and a height direction at intervals in a retaining wall width direction on a retaining wall installation ground existing at a base of a slope. A concrete form is arranged, concrete is poured into the cylindrical form to form a concrete column, and a plurality of arc-shaped wall materials are bridged between adjacent concrete columns, and the wall material and the cylindrical shape are formed. A steel retaining wall built with soil and sand backed between the formwork and the slope. 2. The steel retaining wall according to claim 1, wherein a mounting plate is sandwiched between circumferentially joined portions of the liner plate, and the wall material is mounted on the mounting plate. 3. A cylindrical form is formed by using four liner plates, and one liner plate is disposed to face the slope side, and reinforcement from the liner plate to the slope ground. 2. The steel retaining wall according to claim 1, wherein said anchor is driven. 4. The steel retaining wall according to claim 2, wherein the mounting plate is oriented at 45 ° to a direction perpendicular to the retaining wall. 5. A method of constructing a steel retaining wall for constructing a steel retaining wall according to claim 3, wherein the one liner plate according to claim 3 is provided first. A method for constructing a retaining wall made of steel, comprising: arranging and driving an anchor rod from the liner plate; and assembling the remaining liner plates to form a cylindrical formwork.