JP3960501B2 - Steel retaining wall and method for constructing steel retaining wall - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gravity steel retaining wall and a method for constructing a steel retaining wall .
[0002]
[Prior art]
The retaining wall has a gravity type that resists earth pressure by its own weight, a cantilever type that uses the weight of the soil on the heel plate to stabilize the retaining wall, and the cantilever There is a retaining wall type which is a form in which a retaining wall is added to the formula, and these are generally constructed of unreinforced concrete or reinforced concrete. The concrete retaining wall made of concrete is complicated in the construction method in which concrete is placed in the field by placing a formwork, and it takes a long period of time and requires a skilled worker such as a formwork. . In addition, special foundation works such as a crushed stone foundation are required in consideration of uneven settlement. In addition, in the case of the construction method in which the concrete retaining wall member manufactured in advance in the factory is brought into the field and assembled, the weight of the concrete retaining wall member is large, so it is not easy to carry it into the mountains where the road is not maintained, Also, heavy equipment is required during construction.
[0003]
In order to improve the poor workability of the concrete retaining wall as described above, the steel frame structure is assembled by bolting steel on site, and the screen material is attached to the surrounding surface of this steel frame structure. A construction method is also known in which a filling material such as earth and sand or chestnut is filled inside (see JP-A-58-117136).
[0004]
Also proposed is a construction method in which steel struts such as H-shaped steel are driven into the ground at an interval, and this steel strut is attached to an anchor that has been driven into the ground, and an arc-shaped earth receiving plate is bridged between the steel struts. (Japanese Utility Model Laid-Open 1-136548).
[0005]
[Problems to be solved by the invention]
Among the above conventional construction methods, the concrete earth retaining wall has disadvantages such as complicated work, long construction period, technical work such as formwork is necessary, or there is a problem in transportation, heavy equipment is necessary, etc. There is.
In addition, the retaining wall with a steel frame structure has improved workability compared to a concrete retaining wall, but it is desirable that it can be constructed more easily. Since it is installed, more steel will be used.
In addition, the retaining wall made of steel struts, earth receiving plates and anchors needs to be driven sufficiently deeply, and it is not always easy and may be extremely difficult.
[0006]
The present invention has been made to eliminate the above-mentioned conventional drawbacks, and does not require a technician such as a mold, does not require heavy machinery, has excellent workability, and uses less steel material. It is an object of the present invention to provide a retaining wall and a method for constructing a steel retaining wall.
[0007]
[Means for Solving the Problems]
The earth retaining wall of the present invention that solves the above-described problems is provided on the retaining wall installation ground existing at the base of the slope, with a plurality of arc-shaped liner plates circumferentially and spaced apart in the width direction of the retaining wall. The cylindrical formwork joined in the height direction is inclined to the slope side as a whole, and the joint positions in the circumferential direction of the upper and lower liner plates are aligned and at least two liner plate circles. Place the circumferential joint so that it is near the front and located symmetrically when viewed from the front of the retaining wall ,
A anchor for reinforcement is driven into the slope ground from the liner plate arranged on the slope side,
Concrete is cast into the cylindrical formwork to form a concrete column,
Between the adjacent concrete columns , at the liner plate circumferential joint located symmetrically when viewed from the front of the retaining wall near the front surface, a plurality of arc-shaped wall materials are bridged,
It is constructed by backfilling earth and sand between the wall surface material and the cylindrical formwork and the slope.
[0008]
According to a second aspect of the present invention, in the steel retaining wall according to the first aspect, an attachment plate is sandwiched between the circumferential portions of the liner plate, and the wall material is attached to the attachment plate.
[0009]
Claim 3 is, in steel soil clasp retaining wall of claim 1, the liner plate, to form a cylindrical mold with four circumferentially in each stage, slopes side one liner plate The reinforcing anchor is driven into the slope ground from the liner plate.
[0010]
According to a fourth aspect of the present invention, the mounting plate of the steel retaining wall according to the second aspect forms a 45 ° direction with respect to a direction perpendicular to the retaining wall.
[0011]
According to the fifth aspect of the present invention, four arc-shaped liner plates are joined in the circumferential direction and a plurality in the height direction on the retaining wall installation ground existing at the base of the slope with a spacing in the retaining wall width direction. The cylindrical formwork as a whole is inclined to the slope side as a whole, and the joint portions in the circumferential direction of the upper and lower liner plates are aligned, and at least two liner plate circumferential joints are on the front surface. Place it so that it is located symmetrically when viewed from the front of the retaining wall.
A anchor for reinforcement is driven into the slope ground from the liner plate arranged on the slope side,
Concrete is cast into the cylindrical formwork to form a concrete column,
Between the adjacent concrete columns, at the liner plate circumferential joint located symmetrically when viewed from the front of the retaining wall near the front surface, a plurality of arc-shaped wall materials are bridged,
A construction method of a steel earth retaining wall that constructs a steel earth retaining wall formed by backfilling earth and sand between the wall surface and the cylindrical formwork and the slope,
When forming the cylindrical formwork, only one liner plate of each of the four liner plates in each stage of the cylindrical formwork is disposed so as to face the slope side, and A reinforcing anchor is driven into the slope ground from an appropriate liner plate in the height direction, and then the remaining three liner plates at each stage are assembled to form a cylindrical formwork.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to a steel retaining wall 1 of one example shown in FIGS. FIG. 1 is a plan view of a steel retaining wall 1 according to an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a cross-sectional view taken along line AA in FIG. (Omitted). As shown in these drawings, this steel retaining wall 1 is spaced on the retaining wall installation ground 3 existing at the base of the slope 2 in the retaining wall width direction (left and right direction in FIGS. 1 and 2). And a cylindrical form 4 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 as a whole on the slope 2 side. The joint portions in the circumferential direction of the upper and lower liner plates 9 are aligned so as to be inclined, and at least two liner plate circumferential joint portions are located near the front side and symmetrically viewed from the front of the retaining wall. place manner, driving the liner plate anchor 10 for reinforcing the slope ground (9 in FIG. 4 (a)) disposed on the slope side, the concrete 5 to Da設the cylindrical mold 4 To form the concrete pillar 6 and the adjacent concrete pillar 6 The at liner plate circumferential joints positioned symmetrically when viewed from the retaining wall front on the front side of the above, the arc-shaped wall member 7 passing multiple stages bridged, the wall member 7 and cylindrical mold 4 It is constructed by placing the earth and sand 8 between the slope 2 and the slope 2.
[0013]
As shown in FIGS. 6 (a), 6 (b) and 6 (c), the liner plate 9 is formed by bending both side edges of the corrugated sheet 9a at right angles to form flanges 9b, and fixing the plates 9c to both ends by welding. This is a configuration in which a hole 9d is made and curved in an arc shape.
In this embodiment, as shown in FIG. 4, four liner plates 9 are connected in the circumferential direction to form a cylinder, and in the illustrated example, for example, seven stages are connected to form the cylinder A form frame 4 is formed.
[0014]
As shown in FIGS. 4 and 5, the wall surface material 7 has a configuration in which flat bars 13 are welded and fixed to the upper and left and right edges of the elongated rectangular expanded metal 12. The ear plate 14 with a bolt connection hole is fixed by welding.
[0015]
In this embodiment, as described above, the four liner plates 9 form a cylinder, and one of the liner plates 9 (shown by 9 (A) in FIG. 4) is placed on the slope 2 side. I'm making it. Then, a mounting plate 16 is sandwiched between circumferential portions of the liner plate 9 (A), and the left and right ear plates 14 of the wall surface material 7 are connected to the mounting plate 16 with bolts. Therefore, the position of the mounting plate 16 is 45 ° with respect to the direction perpendicular to the retaining wall surface. If the mounting angle of the mounting plate 16 is 45 °, the concrete column 6 bears the earth pressure acting on the wall surface material 7, so that the concrete column 6 side (cylindrical formwork 4 side) is also on the wall surface material 7 side. It will not cause an excessive force action.
[0016]
Next, a construction method for constructing the steel retaining wall 1 will be described. The steel retaining wall 1 of the present invention has a flat retaining wall installation ground 3 at the base of the slope 2 as in this embodiment, that is, when the slope is suddenly inclined from the flat ground. Is preferred. Usually, at least the cylindrical formwork 4 excavates the slope 2 in a semicircular concave shape, but it is not necessary to shape the slope to form a continuous wall as in the prior art, and the amount of excavation is extremely small. No need for heavy machinery such as backhoes for excavation. However, some excavation and leveling to form the retaining wall installation ground 3 are necessary.
Moreover , as shown in FIG. 3, since the concrete pillar 6 is inclined to the slope 2 side, the retaining wall installation ground 3 is slightly inclined accordingly .
[0017]
When arranging the cylindrical formwork 4 on the retaining wall installation ground 3, first, only the liner plate 9 (A) facing the slope 2 side is arranged. In the case of the illustrated example, the liner plate 9 (A) facing the slope 2 side is connected in seven steps in the height direction. Next, the anchor 10 is driven from an anchor hole of the liner plate 9 (A) at appropriate locations in the height direction (two locations in the illustrated example), and the liner plate 9 (A) is coupled to the anchor 10. This work is a work in a state where the cylindrical formwork 4 is not formed again, and this work is very easy because the vicinity of the retaining wall installation ground 3 is vacant as a wide space.
[0018]
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-described cylindrical mold 4. Since the operation of connecting the remaining three liner plates 9 to form a cylinder can be performed outside the cylinder, this operation is also easy.
[0019]
After the cylindrical formwork 4 is arranged at a necessary place with a space, concrete 5 is placed in the cylindrical formwork 4. Next, the ear plates 14 at both ends of the wall surface material 7 are connected to the mounting plates 16 of the left and right cylindrical mold frames 4 with bolts. This operation is performed in seven steps in the illustrated example.
[0020]
In the illustrated wall surface material 7, the flat bar 13 is not attached to the lower edge portion of the expanded metal 12, but the portion fits inside the flat bar 13 at the upper edge portion of the lower wall material 7.
Further, since the wall material 7 uses the expanded metal 12, an earth and sand leakage prevention mat for preventing earth and sand leakage from the mesh is attached to the back surface of the wall surface material 7. If this earth and sand leakage prevention mat is used as a mat with seeds or if seed spraying is performed after construction, the steel retaining wall 1 made of steel can be greened.
[0021]
Next, the earth and sand 8 are backfilled between the wall surface 7 and the back surface of the cylindrical mold 4 and the slope 2. The steel retaining wall 1 is constructed as described above. The steel retaining wall 1 is a gravity retaining wall, and resists the earth pressure acting on the wall surface material 7 and the concrete column 6 by the weight of the concrete column 6.
[0022]
According to the steel earth retaining wall 1 described above, the formwork (cylindrical formwork 4) for the concrete column 6 can be constructed by bolting the liner plate 9, so that a special skill such as formwork is possible. It is unnecessary.
Even if uneven settlement occurs after the construction, the wall material 7 between the concrete columns 6 easily follows the uneven settlement. Therefore, the retaining wall installation ground 3 is special for crushed stone foundations considering uneven settlement. It is not necessary to apply a foundation work.
[0023]
Moreover, since the liner plate and wall material of the material used are lightweight, it is easy to carry the material used to the site, which is extremely advantageous for construction in mountains where roads are not maintained. Further, large-scale excavation using heavy machinery such as a backhoe is unnecessary, and this is also advantageous for construction in mountains.
[0024]
The retaining wall installation ground 3 is a portion of the cylindrical formwork 4 and the wall surface material 7, but the space of the wall surface material 7 portion can be reduced, so that excavation or leveling for providing the retaining wall installation ground 3 is possible. This is also easy.
Further, since only the wall material 7 such as the expanded metal 12 is provided between the cylindrical molds 4 arranged at intervals, the amount of steel used is also smaller than that of the steel retaining wall with a conventional steel frame structure. Less.
[0025]
Further, the anchor 18 in the present invention can be said to be auxiliary when the weight of the concrete column 6 as a weight body in the gravity retaining wall is insufficient (when the height of the concrete column 6 is suppressed). The anchor 18 does not need to be driven so deep into the slope ground. Therefore, unlike the conventional retaining wall made of steel struts, earth receiving plates and anchors, there is no difficulty associated with the need to drive the steel struts and anchors sufficiently deep.
[0026]
In the present invention, the wall material is not limited to an expanded metal, and a wire mesh, a welded wire mesh, or the like can be used. When these are used, a synthetic resin net can also be used as the net material.
[0027]
【The invention's effect】
According to the steel earth retaining wall of the present invention, since a formwork for a concrete column can be constructed by bolting, no special skill such as formwork is required.
Moreover, since the wall material between concrete pillars can easily follow uneven settlement, it is not necessary to perform special foundation work such as a crushed stone foundation in consideration of uneven settlement.
[0028]
In addition, construction is possible with lightweight materials such as liner plates and wall materials, and heavy equipment is not required, so it is easy to carry the equipment used to the site and it is extremely advantageous for construction in mountains where roads are not maintained. It is.
[0029]
In addition, since the cylindrical formwork portion and the wall surface material portion may be excavated or leveled, the range is narrow and excavation or leveling is easy.
Further, since the space between the cylindrical molds arranged at intervals is a light wall material, the amount of steel material used can be reduced as compared with a steel retaining wall with a conventional steel frame structure.
[0030]
Further, although facilities to anchor the concrete column, the anchor is intended ancillary to the weight of the concrete columns, there is no need to implant very deep slope ground, the conventional steel posts and soil receiving plate Unlike dirt retaining walls with anchors, there are no difficulties associated with driving steel posts or anchors.
[0031]
According to the second aspect of the present invention, when the mounting plate for mounting the wall surface material is sandwiched between the circumferential joints of the liner plate, the mounting structure of the wall surface material is extremely simplified and the mounting work is easy.
[0032]
According to the fifth aspect, when assembling the cylindrical formwork, it is not necessary to work in the cylinder, so that the assembly work of the cylindrical formwork becomes easy.
.
[0033]
According to the fourth aspect, the structure in which the concrete column bears the earth pressure acting on the wall material does not cause an unreasonable force action on both the concrete column side and the wall material side.
[Brief description of the drawings]
FIG. 1 is a plan view of a steel retaining wall according to an embodiment of the present invention.
2 is a front view of the steel retaining wall of FIG. 1. FIG.
3 is a cross-sectional view taken along the line AA in FIG .
4 is an enlarged plan view showing details of a steel member portion in FIG. 1. FIG.
5A is a developed front view of one wall material in FIG. 4, and FIG. 5B is a front view of a mounting plate.
6A and 6B show details of the liner plate used for the steel retaining wall described above, (A) is a plan view, (B) is a front view, and (C) is a cross-sectional view taken along line BB in (B). 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 10 facing to the slope side Anchor 12 Expanded metal 13 Flat bar 16 Mounting plate

Claims (5)

A cylindrical form formed by joining a plurality of arc-shaped liner plates in the circumferential direction and the height direction on the retaining wall installation ground existing at the base of the slope, spaced in the retaining wall width direction , Inclined to the slope as a whole, and the circumferential joint positions of the upper and lower liner plates are aligned, and at least two liner plate circumferential joints are closer to the front and viewed from the front of the retaining wall. Arrange them so that they are symmetrical ,
A anchor for reinforcement is driven into the slope ground from the liner plate arranged on the slope side,
Concrete is cast into the cylindrical formwork to form a concrete column,
Between the adjacent concrete columns , at the liner plate circumferential joint located symmetrically when viewed from the front of the retaining wall near the front surface, a plurality of arc-shaped wall materials are bridged,
A steel earth retaining wall constructed by backfilling earth and sand between the wall surface material and the cylindrical formwork and the slope.   2. The steel earth retaining wall according to claim 1, wherein a mounting plate is sandwiched between joint portions of the liner plate in a circumferential direction, and the wall surface material is mounted on the mounting plate. A cylindrical form is formed by using four liner plates in the circumferential direction at each stage, and one liner plate is arranged facing the slope side, and the slope ground is formed from the liner plate. 2. The steel earth retaining wall according to claim 1, wherein a reinforcing anchor is driven into the steel wall.   The steel earth retaining wall according to claim 2, wherein the mounting plate forms a 45 ° direction with respect to a direction perpendicular to the retaining wall. Cylindrical type formed by joining four circular arc-shaped liner plates in the circumferential direction and a plurality in the height direction on the retaining wall installation ground existing at the base of the slope, spaced in the width direction of the retaining wall The frame is inclined to the slope side as a whole, and the joint positions in the circumferential direction of the upper and lower liner plates are aligned, and at least two liner plate circumferential joints are closer to the front and the front of the retaining wall Placed so that it is symmetrically
A anchor for reinforcement is driven into the slope ground from the liner plate arranged on the slope side,
Concrete is cast into the cylindrical formwork to form a concrete column,
Between the adjacent concrete columns, at the liner plate circumferential joint located symmetrically when viewed from the front of the retaining wall near the front surface, a plurality of arc-shaped wall materials are bridged,
A construction method of a steel earth retaining wall that constructs a steel earth retaining wall formed by backfilling earth and sand between the wall surface and the cylindrical formwork and the slope,
When forming the cylindrical formwork, each of the four liner plates in each stage of the cylindrical formwork 1 Only one liner plate is placed facing the slope side and stacked, and anchors for reinforcement are driven from the appropriate liner plate in the height direction into the slope ground, and then the remaining three liners at each stage A method for constructing a steel retaining wall comprising assembling plates to form a cylindrical formwork.

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