JP2003090056A - Vertical banking method and retaining wall for use in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retaining wall which is formed in a novel designed shape, can easily obtain self-standing stability even in the use of an improper material such as cohesive soil, and has high durability against earth pressure even if the material is thin. SOLUTION: An estimated height can be reached by repeating: a process in which the retaining wall 1, which constitutes a banking surface layer, is constructed; a process in which preceding fill 2a, composed of cement treated soil, is constructed on the backside of the retaining wall 1 at prescribed intervals and in which an anchor bar 7 is horizontally buried in the preceding fill 2a; a process in which anchor bars 6, whose one-side ends are fixed to a protrusive end and the backside of the retaining wall 1 from a layer of fill 2 of the anchor bar 7, are jointed together via a joint fitting 8; and a process in which a gap, formed between the fill 2 and the backside of the retaining wall 1 after curing of the preceding fill 2a, is backfilled with the cement treated soil so that following fill 2b can be constructed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical embankment method and a retaining wall used in this method, and more particularly to a method and retaining wall suitable for vertical high embankment.

[0002]

2. Description of the Related Art One of the vertical embankment methods using retaining walls is the tail armee method and the multi-anchor reinforced earth wall method. In these construction methods, a plurality of anchor bodies such as reinforcing bars are horizontally arranged between the rear surface of the prefabricated retaining wall and the ground, the embankment is applied to cover the anchor bodies, and the procedure of compaction is performed in order from the bottom. By repeating the process, the plan cross section is finally finished.

Further, for example, in Japanese Patent Application No. 10-25855, a concrete block body is used as a retaining wall,
The steps of assembling this block body and embankment on the back surface, and filling a solidifying embankment layer such as soil cement between the embankment and the block body, and rolling the steps are repeated from the bottom to the planned cross section, and the solidification is performed. A construction method is disclosed in which anchors connected to the back surface of the block are arranged in the natural embankment layer to achieve integration.

[0004]

However, in the former construction method, the embankment material is limited to "coarse quality material",
When using a material such as "cohesive soil" which is not suitable as an embankment material, it is difficult to secure stability as an embankment.

Also, in the latter construction method, in terms of stability when the wall surface is rolled, stability of the retaining wall is a problem due to earth pressure when rolling unless the weight of each block as a wall material is increased. Cause For this reason, a lifting machine or the like is required for installation and the like, so that handling and workability are poor.

The present invention solves the above problems.
The purpose is to make unsuitable materials such as cohesive soil,
(EN) A vertical embankment method capable of easily obtaining self-sustaining stability and preventing falling of a retaining wall against earth pressure when the embankment is compacted. Further, the present invention is suitable for the above construction method, and provides a retaining wall having a novel design shape, which has high durability against earth pressure even if the material thickness is thin.

[0007]

In order to achieve the above object, the vertical embankment method according to the present invention has a predetermined height with respect to the back surface of a retaining wall which is constructed at a predetermined height which constitutes the embankment surface layer. A step of burying the anchor reinforcement horizontally in the embankment so as to project from the embankment toward the retaining wall, and the anchor reinforcement embedded in the embankment and the back surface of the retaining wall. Characterized in that the step of joining the anchor bar protruding toward the embankment and the step of constructing the embankment in the gap formed between the back surface of the retaining wall and the embankment are repeated until a predetermined height is reached. To do.

In the present invention, it is preferable that the embankment is made of cement-stabilized soil, and the anchor streak embedded in the embankment has a plurality of cotters for preventing the embankment from coming off. It is preferable that

Further, the retaining wall used in the vertical embankment method according to the present invention is a retaining wall which is constructed at a predetermined height which constitutes the embankment surface layer and on which the embankment is applied on the back surface, in the horizontal direction in the embankment. It is characterized in that a plurality of anchor muscles to be jointed with a plurality of anchor muscles to be embedded in are formed by projecting horizontally from the back surface thereof.

In the present invention, the retaining wall is arranged between a plurality of parent piles arranged vertically at a predetermined interval in the lateral direction, and is arranged between the parent piles, and the central portion in the horizontal cross section is directed toward the embankment side. It is preferable that the earth retaining plate is curved in an arch shape and a cushioning material having a predetermined thickness is arranged on the back surface of the soil retaining plate.

[0011]

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Figure 1
Is a completed drawing of an embankment to which the vertical embankment method of the present invention is applied, FIG. 2 is a plan sectional view taken along the line AA of FIG. 1, and FIG. 3 is an explanatory view of a construction procedure.

In the figure, 1 is a retaining wall constituting the embankment surface layer, 2 is a rear surface of the retaining wall 1 and is constructed in a shape capable of ensuring safety according to the topography of the construction site, which will be described later. Is. In addition, E is an embankment which is simultaneously embankd when the cement stabilization treatment embankment 2 is created.

The retaining wall 1 is composed of a basic concrete 3 constructed in a direction orthogonal to the plane of the paper, and a plurality of parent piles 4 made of H-shaped steel vertically installed at predetermined intervals in the basic concrete 3 and arranged in a row. It is composed of a plurality of soil retaining plates 5 installed by dropping from above so that both ends are arranged between the flanges of the adjacent main piles 4.

On one side (right side in FIG. 2) of the inner flange portion of each parent pile 4, a plurality of through holes are formed at predetermined intervals in the vertical direction, and one end of the anchor bar 6 is passed through the through holes to weld or weld. Fix it with nuts, etc.
Is projected horizontally toward the embankment side. The anchor bar 6 is tightly connected to the end portion of the anchor bar 7 embedded in the embankment 2 through a joint metal fitting 8 in the embankment step described later,
This is for maintaining the independence and vertical accuracy of each parent pile 4 in the initial state of the embankment 2.

In this embodiment, the joint metal fitting 8 is
As shown in Fig. 2, it is a universal type, and in particular, it can be freely adjusted in the up, down, left, and right directions, so that the butt ends of both anchor bars 6, 7 will move slightly in the up, down, left, and right directions during embankment construction, which will be described later. Even if they are misaligned, it is possible to perform a secure bond.

Further, a plurality of cotters 9 are fixed to the outer circumference of the embankment-side anchor bar 7 at a predetermined interval, and due to the anchor effect of the cotter 9, a stable cement treatment in the initial state where sufficient internal friction cannot be expected. A sufficiently large pull-out resistance can be expressed even in soil, and it is possible to cope with variations in the strength of cement-stabilized soil. .

The earth retaining plate 5 is a plate having a predetermined thickness composed of, for example, a PC (precast concrete) plate,
By forming the central part of the horizontal section into an arch shape that curves toward the embankment side, it is possible to sufficiently counter earth pressure even with a thin material thickness, and at the same time, the corrugations appear to be continuous in the lateral direction in appearance. It will be a novel design shape that does. A sealing material 10 is interposed at the joint between the soil retaining plate 5 and the flange of the parent pile 4 so that the watertightness at the joint can be maintained.

Further, on the back surface of the soil retaining plate 5, there is arranged an arch-shaped cushioning material 11 made of expanded polystyrene or the like as a cushioning body which is formed in a curved shape similar to this, and due to its cushioning effect, the soil retaining plate at the time of rolling is retained. Embankment 2 on board 5
It has the role of reducing earth pressure and protecting it from impact.

Next, the construction procedure in the above structure will be described with reference to FIG. First, as shown in (a), a foundation concrete 3 is constructed on the ground E, a plurality of parent piles 4 are built in the foundation concrete 3 at predetermined intervals, and then a retaining plate 5 is dropped between the parent piles 4. The cushioning material 11 is arranged on the rear surface of the soil retaining plate 5 while being installed by the above. Also, the anchor muscles 6 are connected to the main pile 4.

Next, the first layer of cement stabilization treated embankment 2
Make up. This work is a process that takes two days, and spreads the cement-stabilized soil made at a stabilized soil creation plant (not shown) installed near the site,
It is carried out by compaction work by rolling compaction. Specifically, (b)
As shown in (d), the preceding embankment 2a is formed in three steps with a predetermined gap formed on the back surface of the cushioning material 4 and with a predetermined slope.

First, as shown in (b), the first step is a step of sprinkling and compacting with a predetermined gradient and a predetermined thickness with a gap formed on the rear surface of the retaining wall 1, and the second step. Then, in addition to this, the slope with the same slope is created to have the same thickness,
As shown in (c), the embankment side anchor bar 7 is buried, and then, after the third step of embankment construction, as shown in (d), the anchor bars 6, 7 are connected to each other via the joint bracket 8 by means of joint fittings. Link. Parent pile 4 by this connection work
In addition to preventing the falling of the pile, the tightness of the joint metal fitting 8 can be used to correct the verticality of the parent pile 4 and the like.

The above-mentioned work is performed, for example, three times a day, and by setting the thickness of one step to 30 cm, the preceding embankment 2a having a thickness of 90 cm can be obtained in one day.

After completion of the work, the material is cured until the next day, and finally, as shown in (e), the gap formed between the preceding embankment 2a and the back surface of the cushioning material 1 is filled with the cement-stabilized soil which is the same embankment material. After backfilling, the second embankment 2b is constructed and compacted by compaction to form the first cement-stabilized embankment 2. Similarly, the above-described work is repeated every day up to the planned height to complete the vertical embankment in which the retaining wall having the sectional shape shown in FIG. 1 is integrated.

The main pile 4 is successively connected to the upper portion of the cement stabilization embankment 2 every several layers depending on the height of construction.
In response to this, the earth retaining plate 5 and the cushioning material 11 are also sequentially built up. Further, in FIG. 1, reference numeral 12 is a top plate installed on the upper edge of the retaining wall 1 in the final process.

[0025]

As is clear from the above description, according to the vertical embankment method according to the present invention, the minimum necessary range between the back surface of the retaining wall and the embankment layer is the cement-stabilized soil, and Even with unsuitable materials such as soil, it is possible to easily obtain self-sustaining stability. Also, by jointing the anchor reinforcement of the retaining wall and the anchor reinforcement embedded in the embankment, It is possible to prevent the retaining wall from collapsing against the earth pressure, and thus a simple vertical wall construction method can be adopted.

Further, according to the retaining wall of the present invention, it is suitable for use in the vertical embankment method and can be constructed easily with a small material thickness and a light weight, but it is stable against earth pressure during rolling. Highly durable and durable, it can be made into a novel design shape in appearance.

[Brief description of drawings]

FIG. 1 is a completed drawing of an embankment to which the vertical embankment method of the present invention is applied.

FIG. 2 is a plan sectional view taken along the line AA of FIG.

3 (a) to (e) are cross-sectional views for explaining a construction procedure of the construction method.

[Explanation of symbols]

1 retaining wall 2 Cement stabilization embankment 2a Leading embankment 2b Trailing embankment 4 parent pile 5 earth retaining wall 6,7 Anchor muscle 8 joint fittings 9 cotters 11 cushioning material

Claims (6)

[Claims] 1. An embankment having a predetermined height is installed at a predetermined interval on the back surface of a retaining wall that is constructed at a predetermined height that constitutes the surface layer of the embankment, and is projected from the embankment toward the retaining wall. A step of horizontally embedding an anchor bar in the embankment, a step of joining the anchor bar embedded in the embankment and an anchor bar projecting from the back surface of the retaining wall toward the embankment, and the back surface of the retaining wall A vertical embankment method, wherein the step of applying embankment to the gap formed between the embankment and the embankment is repeated until a predetermined height is reached. 2. The vertical embankment method according to claim 1, wherein the embankment is cement-stabilized soil. 3. The anchor bars embedded in the embankment are:
The vertical embankment method according to claim 1 or 2, wherein a plurality of cotters are arranged to prevent the embankment from coming off. 4. A retaining wall which is constructed at a predetermined height constituting a surface layer of the embankment and on which a embankment is applied on the rear surface thereof, and which comprises a plurality of joints which are jointed with a plurality of anchor bars horizontally embedded in the embankment. A retaining wall used in the vertical embankment method, which is characterized in that the anchor bar is formed so as to project horizontally from the back surface thereof. 5. The retaining wall is provided with a plurality of parent piles arranged vertically at a predetermined interval in a lateral direction, and is arranged between the parent piles, and has an arch shape with a central portion in a horizontal cross section facing the embankment side. The retaining wall used in the vertical embankment method according to claim 4, characterized in that the retaining wall is composed of a curved earth retaining plate. 6. The retaining wall used for the vertical embankment method according to claim 5, wherein a cushioning material having a predetermined thickness is arranged on the back surface of the earth retaining plate.