JPH11315547A - Constructing method of l-shaped retaining wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the constructing method of an L-shaped retaining wall, in which the L-shaped retaining wall is built at low cost in a short period while a stable ground in a natural grounded on the rear side of the L-shaped retaining wall is not also disarranged. SOLUTION: When the L-shaped retaining wall 2, in which a bottom floor section and a vertical wall section 2b are continued in an L-shaped, is built, a natural ground 1 is excavated up to the section of the vertical wall section 2b of the L-shaped retaining wall 2 to be constructed first, and a stepped section is formed at the lower end section of the excavated surface 1a. The vertical wall section 2b is formed to the upper section of the stepped section 1b by concrete or the vertical wall section 2b consisting of a concrete secondary product such as precast concrete is arranged to the upper section of the stepped section, the stepped section 1b is excavated in the horizontal direction and a horizontal hole 1c for forming the bottom floor section is bored to the lower section of the vertical wall section 2b, and the inside of the horizontal hole 1c is filled with ready-mixed concrete and the bottom floor section 2a is shaped. Or the bottom floor section 2a composed of the concrete secondary product such as precast concrete is fitted into the horizontal hole 1c, and consolidated and unified by concrete. The bottom floor section 2a is extended at the lower end of the vertical wall section 2b, and the L-shaped retaining wall 2 is constructed at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an L-shaped retaining wall used for constructing roads, residential land, and the like.

[0002]

2. Description of the Related Art Conventionally, in the construction of roads and residential lands, the construction of an L-shaped retaining wall (a concrete wall having a bottom floor and a vertical wall connected in an L-shape) by excavating the ground is shown in FIG. As shown in the figure, the earth and sand in the portion A indicated by the broken line of the ground 1 is excavated and removed, and the L-shaped retaining wall 2 in which the bottom floor portion 2a and the vertical wall portion 2b are connected to the L-shape is constructed in the portion A Then, the earth and sand are buried behind the L-shaped retaining wall 2.

[0003]

However, in the above-described conventional method of constructing an L-shaped retaining wall, the rear edge of the bottom floor 2a of the L-shaped retaining wall 2 to be constructed by excavation of the ground 1 (in the figure). And the left edge), and it is necessary to excavate the ground 1 at an angle in order to ensure the safety of the construction. This increases the construction cost and prolongs the construction period. When the ground 1 cannot be excavated at an angle due to restrictions on the land, etc., it is necessary to provide a temporary wall for retaining the ground so that the ground 1 does not collapse.

In the conventional method of constructing an L-shaped retaining wall, the stable ground of the ground 1 is excavated and backfilled, so that the backfilled portion becomes weaker than before excavation. ,
Therefore, the stable ground of the ground 1 behind the L-shaped retaining wall 2 is found in a considerably large area. Moreover, during construction of the L-shaped retaining wall 2, most of the earth and sand excavated and removed from the ground 1 needs to be temporarily stored, and a large space is required for the storage.

Accordingly, the present invention has been made in view of the above-mentioned problems of the conventional method of constructing an L-shaped retaining wall, and in addition to constructing the L-shaped retaining wall in a short period of time and at a low cost, the present invention has also been proposed. An object of the present invention is to provide a method of constructing an L-shaped retaining wall that does not protrude a stable ground of the ground.

[0006]

According to the present invention, in order to achieve the above object, when constructing an L-shaped retaining wall in which a bottom floor portion and a vertical wall portion are connected in an L-shape, a ground is first constructed. After excavating to the vertical wall of the L-shaped retaining wall to form a step at the lower end of the excavated surface, and forming a vertical wall with concrete above the step, or above the step After arranging a vertical wall portion made of a concrete secondary product such as precast concrete, the step portion is excavated in the horizontal direction, and a horizontal hole for forming a bottom floor is formed below the vertical wall portion, and the horizontal hole is formed. By filling the hole with ready-mixed concrete to form the bottom floor,
Alternatively, an L-shaped retaining wall is constructed by fitting a bottom floor made of a secondary product of concrete such as precast concrete into a horizontal hole and solidifying and integrating with concrete, thereby adding the bottom floor to the lower end of the vertical wall. It is something to do.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for constructing an L-shaped retaining wall according to the present invention will be described below with reference to an embodiment shown in FIGS. 1 to 4, reference numeral 1 denotes a ground pile, and 2 denotes an L-shaped retaining wall in which a bottom floor portion 2a and a vertical wall portion 2b are continuous in an L shape.

[0008] The method of the present invention, first, as shown in FIG.
The earth and sand in the portion B indicated by the broken line of the ground 1 (the portion up to the vertical wall portion 2b of the L-shaped retaining wall 2 to be constructed) is excavated and removed. At that time, the ground 1 was excavated at a slight angle and the excavated surface 1
a is formed in a slightly inclined state, and the excavation surface 1a
Step 1b having a height corresponding to the thickness of the bottom floor portion 2a of the L-shaped retaining wall 2 to be constructed at the lower end portion and a width corresponding to the thickness of the vertical wall portion 2b of the L-shaped retaining wall 2 to be constructed. To form

Next, a reinforcing reinforcing bar (not shown) is provided above the step portion 1b of the ground 1 and a formwork for forming the vertical wall is provided above the step 1b of the ground 1. After assembling (not shown), the mold is filled with ready-mixed concrete to form a vertical wall portion 2b on the step portion 1b of the ground 1 as shown in FIG. In order to prevent the vertical wall portion 2b from collapsing in a later step, the vertical wall portion 2b is connected to a stable ground of the ground 1 via an anchor member (not shown) such as a steel material or the vertical wall portion 2b. Is desirably supported by a pile (not shown) of H steel material or the like in which is embedded.

Next, as shown in FIG. 3, a step portion 1b of the ground 1 is excavated in the horizontal direction, and the L-shaped retaining wall 2 to be constructed is constructed.
A horizontal hole 1c for forming a bottom floor portion having a depth corresponding to the width of the bottom floor portion 2a. When the horizontal hole 1c for forming the bottom floor is cut, the horizontal hole 1c does not collapse.
Each time the horizontal hole 1c is excavated for an arbitrary length, it is desirable to drive the dependent frame 3 shown in FIG. 5 (a) or (b).
The dependent frames 3 shown in FIG. 5 (a) have different dimensions, and smaller ones are fitted gradually toward the inner side of the horizontal hole 1c. The dependent frames 3 shown in FIG. 5B have the same dimensions, and are sequentially pushed in from the entrance of the horizontal hole 1c.

Next, a reinforcing reinforcing bar (not shown) is provided in the horizontal hole 1c of the ground 1 and then the horizontal hole 1c is provided.
By filling the inside with fresh concrete to form the bottom floor portion 2a, as shown in FIG.
a is added to construct the L-shaped retaining wall 2. In addition, the bottom floor reinforcement is arranged such that reinforcement is added to the lower end of the vertical wall reinforcement.

Next, after forming a permeable layer 4 of crushed stone, rubble stone or polyethylene sheet on the back surface of the vertical wall portion 2b of the L-shaped retaining wall 2, the excavated surface 1a of the ground 1 and the L-shaped retaining wall 2 are formed. Earth and sand are backfilled in a slight gap between the vertical wall 2b. Thereafter, by repeating the same procedure, the L-shaped retaining wall 2 is continuously constructed in the lateral direction (perpendicular to the paper surface).

As described above, according to the L-shaped retaining wall groove forming method of the present invention, the vertical wall portion 2b of the L-shaped retaining wall 2 on which the ground 1 is to be constructed.
And a stepped portion 1 at the lower end of the excavated surface 1a.
b, a vertical wall portion forming mold is assembled above the step portion 1b, and the concrete frame is filled in the mold to form a vertical wall portion 2b, and then the step portion 1b is moved horizontally. Excavation cuts a horizontal hole 1c for forming a bottom floor below the vertical wall 2b, and fills the horizontal hole 1c with fresh concrete to form the bottom floor 2a, thereby forming the vertical wall 2b. The L-shaped retaining wall 2 is constructed by adding a bottom floor portion 2a to the lower end of the L-shaped retaining wall 2, and the vertical wall portion 2b of the L-shaped retaining wall 2 to be constructed by excavation of the ground 1
, The excavation range of the ground 1 is greatly reduced, and the L-shaped retaining wall 2 can be constructed without protruding the stable ground of the ground 1 on the rear side thereof. Moreover, before the bottom floor 2a is formed, the vertical wall 2b is formed.
Is formed, so that the horizontal hole 1c for forming the bottom floor portion is formed.
In the excavation work or the concrete placing work of the bottom floor 2a, the collapse of the ground 1 can be prevented by the vertical wall 2b.

In the above-described embodiment, a vertical wall forming mold is assembled in front of the excavated surface 1a of the ground 1 and the vertical wall 2b is formed by filling the form with ready-mixed concrete. However, it is also possible to install a secondary concrete product such as precast concrete or the like in front of the excavated surface 1a of the ground 1 to form the vertical wall portion 2b. in this case,
By forming a horizontal hole 1c for forming a bottom floor below the vertical wall 2b made of a concrete secondary product, and filling the horizontal hole 1c with ready-mixed concrete to form a bottom floor 2a, Alternatively, the bottom wall portion 2a made of a secondary concrete product such as precast concrete is fitted into the horizontal hole 1c and solidified and integrated with concrete to form the vertical wall portion 2b.
An L-shaped retaining wall 2 is constructed by adding a bottom floor portion 2a to the lower end of the base.

In the above embodiment, the bottom floor 2a having the entire upper surface formed flat is used. However, as shown in FIG. 6, a bottom floor 2a having a step 2a 'at the front end of the upper surface is used. Thereby, the strength of the bent portion of the L-shaped retaining wall 2 can be enhanced.

[0016]

According to the method of the present invention, the excavation of the ground reaches only the vertical wall portion of the L-shaped retaining wall to be constructed, and the excavation range of the ground can be greatly reduced. The amount of excavation and unloading of earth and sand can be considerably reduced, and construction costs can be reduced and the construction period can be shortened. At the same time, a situation in which the ground behind the L-shaped retaining wall has stable ground can be found. Not even. Moreover, since the collapse of the ground can be prevented at the vertical wall portion, the safety of the excavation work of the horizontal hole for forming the bottom floor and the concrete placing operation of the bottom floor can be improved.

[Brief description of the drawings]

FIG. 1 is a process explanatory view of a method for forming a groove in an L-shaped retaining wall according to the present invention.

FIG. 2 is a process explanatory view of a method for forming a groove in an L-shaped retaining wall according to the present invention.

FIG. 3 is a process explanatory view of a method for forming a groove in an L-shaped retaining wall according to the present invention.

FIG. 4 is a process explanatory view of a method for forming a groove in an L-shaped retaining wall according to the present invention.

5A is a drawing showing an example of a dependent frame, and FIG. 5B is a drawing showing another example of a dependent frame.

FIG. 6 is a sectional view showing another example of the bottom floor portion of the L-shaped retaining wall.

FIG. 7 is a cross-sectional view showing a conventional method of forming a groove in an L-shaped retaining wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground 1a Excavation surface 1b Step part 1c Side hole 2 L-shaped retaining wall 2a Bottom floor part 2a 'Step part 2b Vertical wall part 3 Dependent frame 4 Permeable layer

Claims (2)

[Claims] When constructing an L-shaped retaining wall in which a bottom floor portion and a vertical wall portion are connected in an L-shape, first, an excavation is performed up to a vertical wall portion of the L-shaped retaining wall on which the ground is to be constructed. A step is formed at the lower end of the excavated surface, and a vertical wall is formed of concrete above the step, and then the step is excavated horizontally to form a bottom floor below the vertical wall. The horizontal hole was cut and filled with fresh concrete in the horizontal hole to form the bottom floor, so that the bottom floor was added to the lower end of the vertical wall to construct an L-shaped retaining wall. A groove construction method for an L-shaped retaining wall, characterized in that: 2. When constructing an L-shaped retaining wall in which a bottom floor portion and a vertical wall portion are connected in an L-shape, first, excavation is performed to a portion of the vertical wall portion of the L-shaped retaining wall on which the ground is to be constructed. A step portion is formed at the lower end of the excavation surface, and a vertical wall portion made of a concrete secondary product such as precast concrete is arranged above the step portion. Then, the step portion is excavated in a horizontal direction and the vertical wall portion is formed. A horizontal hole for bottom floor formation is cut below the bottom, and a bottom floor made of a secondary product of concrete such as precast concrete is fitted into the horizontal hole and solidified and integrated with concrete. A bottom floor portion is added to a lower end of the portion to form an L-shaped retaining wall;