JP3328580B2 - Construction method of L-shaped retaining wall - Google Patents

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, etc., in the case of constructing an L-shaped retaining wall (a concrete floor having a bottom floor and a vertical wall connected in an L-shape) by excavating the ground, 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 because it is necessary to excavate the ground 1 at an angle in order to ensure the safety of construction, the excavation range of the ground 1 becomes considerably large, and therefore, the amount of excavation and unloading of earth and sand is reduced. 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, since the stable ground of the ground 1 is excavated and backfilled, 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 the bottom floor portion and the vertical wall portion are connected to each other in an L-shape, first, a ground must be constructed. Excavate up to the vertical wall of the L-shaped retaining wall, and make the lower end of the excavated surface horizontal.
Each time you excavate an arbitrary length in the direction,
After making a horizontal hole for forming the bottom floor while preventing falling, and after forming the bottom floor with concrete in the horizontal hole, or
After fitting a bottom floor made of a secondary concrete product such as precast concrete into the horizontal hole and arranging it, assemble a formwork for forming a vertical wall above this bottom floor and put ready-mixed concrete in the formwork. Filling to form a vertical wall, or placing a vertical wall made of a concrete secondary product such as precast concrete on the bottom floor and consolidating it with concrete An L-shaped retaining wall is constructed by adding a vertical wall portion to the upper portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for constructing an L-shaped retaining wall according to the present invention will be described based on an embodiment shown in FIGS. 1 to 3, 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 connected 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,
a is formed in a slightly inclined state.

Next, the lower end of the excavated surface 1a of the ground 1 is excavated in the horizontal direction, and the bottom floor 2 of the L-shaped retaining wall 2 to be constructed.
horizontal hole 1 for forming a bottom floor having a depth corresponding to the width of a
b is removed. In addition, when the horizontal hole 1b for forming the bottom floor is cut and cut, the horizontal hole 1b is prevented from collapsing.
It is desirable to drive in the dependent frame 3 shown in FIG. FIG. 4 (a)
The sizes of the dependent frames 3 shown in (1) and (2) are different from each other, and smaller ones are gradually fitted toward the inner side of the horizontal hole 1b. The dependent frames 3 shown in FIG. 4B have the same dimensions, and are sequentially pushed in from the entrance of the horizontal hole 1b.

Next, reinforcing steel bars (not shown) are laid in the horizontal holes 1b of the ground 1 and then, as shown in FIG. Floor 2
a is formed. At this time, the bottom floor portion 2a is formed such that the front end portion (right end portion in the figure) of the bottom floor portion 2a projects from the horizontal hole 1b by an amount corresponding to the width 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 disposed above the front end of the bottom floor 2a protruding from the horizontal hole 1b of the ground 1 and the front end of the bottom floor 2a is further provided. After assembling a vertical wall forming mold (not shown) upward, the vertical wall forming mold is filled with ready-mixed concrete to form the vertical wall 2b, as shown in FIG. Then, an L-shaped retaining wall 2 is constructed by adding a vertical wall portion 2b on the bottom floor portion 2a. In addition,
The vertical wall reinforcing bars are arranged by adding a reinforcing bar to one end of the bottom floor reinforcing bar.

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 between the vertical wall 2b. Hereinafter, by repeating the same procedure, the L-shaped retaining wall 2 is continuously constructed in the lateral direction (a method perpendicular to the paper surface).

As described above, according to the construction method of the L-shaped retaining wall 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.
Excavation, and the lower end of the excavation surface 1a
Each time excavation of an arbitrary length, the frame 3 was driven in and collapsed
A horizontal hole 1b for shaping the bottom floor is cut while preventing the occurrence of the problem, and the horizontal hole 1b is filled with ready-mixed concrete to form a bottom floor 2a, and then a vertical wall is formed above the bottom floor 2a. By assembling a forming form and filling the form with fresh concrete to form the vertical wall 2b, the vertical wall 2 is formed on the bottom floor 2a.
b was added to construct the L-shaped retaining wall 2.
The excavation of the ground 1 is up to the vertical wall portion 2b of the L-shaped retaining wall 2 to be constructed, whereby the excavation range of the ground 1 is greatly reduced, and the L-shaped retaining wall 2 is moved to the rear side. It can be constructed without protruding the stable ground of the ground 1.

In the above embodiment, the bottom floor 2a is formed by filling ready-mixed concrete into the horizontal hole 1b for forming the bottom floor formed in the excavated surface 1a of the ground 1. However, it is also possible to form a bottom floor portion 2a by fitting a concrete secondary product such as precast concrete into a horizontal hole 1b for forming a bottom floor portion cut out on the excavation surface 1a of the ground 1. In this case, a vertical wall portion forming form is assembled above the bottom floor portion 2a made of a concrete secondary product, and the form is filled with fresh concrete to form the vertical wall portion 2b, or The vertical wall portion 2b made of a concrete secondary product such as precast concrete is placed on the bottom floor portion 2a and solidified and integrated with concrete, so that the vertical wall portion 2b is added on the bottom floor portion 2a to form an L-shape. The retaining wall 2 is constructed.

In the above-described embodiment, the bottom wall 2a having the entire upper surface formed flat is used. However, as shown in FIG. 5, 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 is limited to 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, construction costs can be reduced and the construction period can be shortened. In addition, stable ground in the ground behind the L-shaped retaining wall is found. Not even.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a process explanatory view of an L-shaped retaining wall construction method of the present invention.

FIG. 2 is a process explanatory view of an L-shaped retaining wall construction method of the present invention.

FIG. 3 is an explanatory view showing the steps of the method for constructing an L-shaped retaining wall according to the present invention.

4A is a drawing showing an example of a dependent frame, and FIG. 4B is a drawing showing another example of a dependent frame.

FIG. 5 is a sectional view showing another example of the bottom floor portion of the L-shaped retaining wall.

FIG. 6 is a cross-sectional view showing a conventional method of constructing an L-shaped retaining wall.

[Explanation of symbols]

 Reference Signs List 1 ground 1a excavated surface 1b horizontal hole 2 L-shaped retaining wall 2a bottom floor 2a 'stepped portion 2b vertical wall 3 dependent frame 4 permeable layer

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-246478 (JP, A) JP-A-6-330533 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 29/02 305

Claims (2)

(57) [Claims] When constructing an L-shaped retaining wall in which a bottom floor portion and a vertical wall portion are connected to each other in an L-shape, first, excavation is performed up to the vertical wall portion of the L-shaped retaining wall on which the ground is to be constructed . The lower end of the excavation surface
Each time you excavate an arbitrary length in the horizontal direction, you will drive in a dependent frame
A horizontal hole for forming the bottom floor is cut while preventing collapse, and a bottom floor is formed with concrete in the horizontal hole. Then, a formwork for forming the vertical wall is assembled above the bottom floor. An L-shaped retaining wall characterized by filling the ready-mixed concrete into the formwork to form a vertical wall portion, thereby adding the vertical wall portion to the bottom floor to form an L-shaped retaining wall. How to build a wall. 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 up to a vertical wall portion of the L-shaped retaining wall on which the ground is to be constructed . The lower end of the excavation surface
Each time you excavate an arbitrary length in the horizontal direction, you will drive in a dependent frame
In order to prevent collapse, a horizontal hole for bottom floor molding is cut out, and a bottom floor made of a concrete secondary product such as precast concrete is fitted and placed in the horizontal hole, and the bottom floor is also placed on this bottom floor. The vertical wall made of secondary concrete products such as precast concrete is placed and consolidated with concrete, so that the vertical wall is added to the bottom floor to form an L-shaped retaining wall A method for constructing an L-shaped retaining wall, characterized in that: