JPH0118680Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention relates to a retaining wall using steel plates, and in particular, to a rigid retaining wall by installing steel plates between the supports so that the protruding direction is in the front direction of the retaining wall. This product relates to retaining walls made of steel plates, which are used in the construction and maintenance of foundations and walls of roads and railways.

[Technical background of the invention]

Retaining walls are constructed in places where stability cannot be maintained on slopes with the soil surface exposed due to site and topographical conditions during road earthworks such as embankments and cuts, or in places where stability cannot be maintained on slopes with the soil surface exposed. This is a structure that is built to protect the slope and protect the foundations when building roads and railways.

Some retaining walls use steel plates that are lightweight, easy to handle, economical, easy to implement, and have a certain degree of flexibility.

[Problems in the Background Art] However, as shown in FIG. 9, in a retaining wall in which the steel plate 2 is formed in an arc shape, when the protrusion direction faces the embankment side which is the back side, the protrusion of the steel plate 2 Earth pressure (in the direction of the arrow) from the embankment acts on the back surface of the steel plate 2, and compressive force acts on the entire cross section of the steel plate 2, causing damage such as buckling and deformation, especially in the protruding central part. . For this reason, it is necessary to make the steel plate 2 thick to resist earth pressure, but making the steel plate 2 thick in this way increases the weight, making it inconvenient to handle and increasing the material cost.

Further, as shown in Fig. 10, when the steel plate 2 is formed into a flat plate shape, compressive force is applied to the embankment side with respect to the neutral plane C of the steel plate 2 due to the action of earth pressure (in the direction of the arrow) due to the embankment. As a result, the properties of the steel plate, which is strong against tensile force, cannot be fully utilized, and there is a problem in that buckling occurs.

Furthermore, when the steel plates 2 are formed into an arc shape in a side view, protrude from the front side of the retaining wall, and are connected long in the longitudinal direction, since there are no supports between the steel plates, the steel plates are damaged by strong earth pressure. 2 is easily deformed, and furthermore, it is difficult to install when the ground is soft soil such as sandy soil, and an improvement has been desired.

[Purpose of invention]

Therefore, in order to eliminate the above-mentioned inconvenience, the purpose of this invention is to erect steel plates between the supports so that the protruding direction is in the front direction of the retaining wall, and also to align each side edge of the adjacent steel plate towards the back side of the retaining wall. The tensile material is bent and fixed to the pillars so that they face each other, one end is connected to both edges of the steel plate, and the other end is buried in the embankment to generate tensile strength to resist the earth pressure acting on the back of the retaining wall. By providing this, it is possible to improve the durability of the retaining wall, save material costs, and realize a retaining wall using steel plates that can be constructed economically.

[Structure of the idea]

In order to achieve this purpose, this idea involves erecting a plurality of pillars on the ground, forming them into an arc shape in plan view, and placing a steel plate between the two pillars so that the protruding direction is in the front direction of the retaining wall. Each side edge of the adjacent steel plate is bent toward the back of the retaining wall and fixed to the support column so that they face each other, one end side is connected to both side edges of the steel plate, and the other end side is in the embankment. The retaining wall is characterized by being provided with a tensile material that is buried and generates a tensile force that resists the earth pressure acting on the rear surface of the retaining wall.

[Example of idea]

Embodiments of this invention will be described in detail and concretely below based on the drawings.

1 to 6 show a first embodiment of this invention. In the figure, 2 is a rectangular thin steel plate. The side edges 2a and 2b of this steel plate 2 are slightly bent in the same direction with respect to the plane. Reinforcing members 4a, 4b in the form of bands are attached in the vertical direction to these side edges 2a, 2b, respectively. The reinforcing materials 4a and 4b are for strengthening the side edges 2a and 2b of the steel plate 2 so that they will not be damaged. Side edges 2a, 2b of the steel plate 2 equipped with the reinforcing materials 4a, 4b
A plurality of mounting holes 6a and 6b are bored at equal intervals in the portion, through which bolts 24 of a mounting tool 28, which will be described later, are inserted.

The steel plate 2 is installed between two pillars 8, and a retaining wall 10 is constructed as follows. As shown in Figure 5,
A slightly larger hole 14 is excavated in the ground 12 in which the lower part of the support column 8 is to be buried. The reason why this hole 14 is excavated to a large size is to attach a support plate 16 to increase the support area of the lower end of the support column 8 to ensure stability after burial, and to perform centering, vertical, and horizontal adjustment during burial. If a thin layer of split stone 18 is spread at the bottom of the hole 14 and lightly tamped, the stability of the support column 8 will be improved. Then, the pillar 8 is vertically installed in the hole 14, and at this time, it is backfilled while making the above-mentioned adjustment, and the soil is sufficiently compacted and backfilled. Note that the soil used for this backfilling should be soil that has a compacting effect, and in the case of sandy soil, it is best to pour cement or clay soil. In this way, a plurality of the pillars 8 are erected in a line in the direction in which the wall surface is constructed.

The steel plate 2 is installed between each of the pillars 8 erected in this way. That is, as shown in FIGS. 3 and 4, one end 2a and the other end 2b of the steel plate 2 are bent and oriented toward the rear surface of the retaining wall 10. A side end of a plate-shaped fixture 20 oriented in the axial direction of the support 8 is attached to the outer periphery of the support 8. One side edge 2a of the steel plate 2 is brought into contact with one surface of the fixture 20, and one side edge 2b of another adjacent steel plate 2 is brought into contact with the other surface of the fixture 20. Further, holes (not shown) are formed in this fixture 20 at positions corresponding to the mounting holes 6a and 6b. These side edges 2a, 2b of the steel plate 2 and the fixtures 20 are connected to each side edge 2 of the adjacent steel plate 2 via the tensile material fixtures 22 that clamp them.
Bolts 24 and nuts 26 are integrated with a and 2b.
It is fastened by a fixture 28 consisting of. Thereby, each side edge 2a, 2b of the adjacent steel plate 2 is fixed to the support column 8. Furthermore, one side edge 2a of another steel plate 2 and the other side edge 2b of the adjacent steel plate 2,
It is installed on the support column 8 in the same manner as described above. At this time, steel plate 2
The steel plates 2 are arranged in an arcuate shape in a plan view, and are installed between the supports 8 so that the protruding direction of the steel plates 2 is in the front direction of the retaining wall 10. The tensile material fitting 22
A tensile member 30 (for example, a steel band or a tension cable having a supporting member) is attached to the steel plate 2 to resist the earth pressure acting on the back surface of the steel plate 2. In other words, the tensile material 30 has one end connected to each side edge 2a, 2b of the steel plate 2, and the other end buried in the embankment 34 to generate a tensile force that resists the earth pressure acting on the back surface of the retaining wall 2. It is something. A turnbuckle 32 is interposed in the middle of this tensile material 30 on the support column 8 side. This turnbuckle 32 is for adjusting non-uniformity of the steel plate 2. Furthermore, the tensile material 30 is attached to the strut 8 during construction.
Install it so that it is perpendicular to the ground and horizontal to the ground of the base layer.

The turnbuckle 32 interposed in the middle of the tensile material 30 is temporarily fixed, and the embankment work of the base layer is performed from the farthest side of the support 8. After applying embankment 34 to this part,
This embankment 34 is compacted and backfilled. Then, on the pillar 8 side which has not yet been backfilled, the unevenness of the steel plate 2 is adjusted by the turnbuckle 32, and finally the pillar 8 side is backfilled and compacted to complete the embankment work of the base layer.

Hereinafter, similar to the above-mentioned base layer part, the second layer, the third layer...
The vertical retaining wall 10 is constructed by performing the following operations.

In the retaining wall 10 constructed as described above, the sixth
As shown in the figure, the retaining wall 1 has an arc shape in the plan view.
Steel plate 2 protruding in the front direction of 0. Embankment 34 on the back.
Only tensile force acts due to the earth pressure. This steel plate 2
Since the steel plate 2 has a property of being strong against tensile force, it can sufficiently resist earth pressure despite the thin steel plate 2. Further, the steel plate 2 is firmly fixed between the pillars 8 erected on the ground 12, and the side edges 2a and 2b are made of tensile material 30.
The retaining wall 10 is pulled toward the rear surface by the retaining wall 10.
Thereby, the entire retaining wall 10 can be constructed firmly and its durability can be improved.

Furthermore, when earth pressure acts on the back side of the steel plate 2, the bolts 24 of the fixture 28 receive less shearing force from the steel plate 2, so damage to the bolts 24 is prevented, and the side edges 2a of the steel plate 2, Attachment hole 6a drilled in 2b,
6b is not damaged, and the strength of the connection portion of the steel plate 2 can be improved.

Furthermore, since the steel plate 2 is more flexible than a block when the steel plate 2 is attached, even if the attachment positions between the supports 8 are shifted, it is easily compensated for and the attachment work can be performed easily.

7 and 8 show a second embodiment of this invention. In the following examples, the first
The parts that perform the same functions as those in the embodiment will be described with the same reference numerals.

This second embodiment is characterized by the following points. That is, the support 8 in the first embodiment described above is a hollow cylinder 36, and the fixture 20 is not attached to this hollow cylinder 36, but an eye bolt 38 functioning as a fixture is installed perpendicularly to the hollow cylinder 36, and this eye bolt The attachment tool 2 is inserted into the hole 40 of the head of 38.
Insert the bolt 24 of No. 8 into the threaded portion 42 and tighten the nut No. 4
4 is screwed on and fastened.

If configured as in this second embodiment, the above-mentioned first
In addition to obtaining the same effect as in the embodiment, the fixture 2 is attached to the support 8.
There is no need to attach a 0, making it easy to manufacture, and the hollow cylinder serving as the support is lightweight, and it can be disassembled, making it easy to handle.

[Effect of idea]

As is clear from the above detailed explanation, according to this invention, steel plates are erected between the columns so that the protruding direction is in the front direction of the retaining wall, and each side edge of the adjacent steel plate is folded in the rear direction of the retaining wall. Each side edge of the steel plate is fixed to the support, and one end is connected to the side edge of the steel plate while the other end is buried in the embankment to resist the earth pressure acting on the back of the retaining wall. By installing a tensile material that generates a tensile force, only the tensile force due to earth pressure acts on the steel plate, and by taking advantage of the strength of the steel plate in tensile force, we aim to improve the durability of the steel plate and create a strong support. You can build walls. As a result, the steel plate can be formed thin and lightweight, making it easy to handle, and also saving material and making it inexpensive.

In addition, by fixing the side edges of steel plates to the erected columns and connecting tensile materials to both edges, the entire retaining wall becomes solid and can withstand large earth pressures. Durability can be improved.

Furthermore, by connecting the side edges of adjacent steel plates facing toward the rear of the retaining wall using fixtures, the strength of the side edge connection areas is improved, and earth pressure is applied to the center of the steel plates. However, there is no risk of damage to the connection parts even when the connection is made, and the service life can be extended.

Furthermore, even if the mounting positions between the columns shift, this mounting error can be easily compensated for because the steel plate is more flexible than the blocks, and the assembly work can be accomplished easily.

In addition, since the steel plates are installed between the pillars at narrow intervals and in an arc shape in the plan view, they can sufficiently resist changes in earth pressure in the vertical direction, allowing the retaining wall to be constructed solidly, and the embankment. It becomes possible to improve stability.

[Brief explanation of drawings]

Figures 1 to 6 show the first embodiment of this invention, Figure 1 is a front view of the steel plate, Figure 2 is a plan view of the steel plate, Figure 3 is a plan view of the steel plate installed between the supports, FIG. 4 is an enlarged partial perspective view showing how the steel plate and the support are attached, FIG. 5 is a schematic side view of the retaining wall, and FIG. 6 is a partial perspective view of the retaining wall. 7 and 8 show a second embodiment of this invention, FIG. 7 is a plan view showing how the steel plate and the support are attached, and FIG. 8 is a side view of the eye bolt. FIGS. 9 and 10 are plan views of a conventional steel plate showing a state in which the steel plate is attached. In the figure, 2 is a steel plate, 4 is a reinforcing material, 8 is a column, 10 is a retaining wall, 28 is a fixture, 30 is a tensile material,
And 34 is the embankment.

Claims (1)

[Scope of utility model registration request] A plurality of pillars are erected on the ground, and a steel plate is installed between the two pillars so that they are formed in an arc shape in a plan view and the protruding direction is in the front direction of the retaining wall,
Each side edge of the adjacent steel plate is bent toward the rear side of the retaining wall and fixed to the pillar so as to face each other, one end side is connected to both side edges of the steel plate, and the other end side is buried in the embankment. A retaining wall using a steel plate, characterized in that a tensile member is provided that generates a tensile force that resists earth pressure acting on the rear surface of the retaining wall.