JPH0617420A - Earth retaining wall and construction thereof - Google Patents

Abstract

PURPOSE:To prevent excessive use of members, withstand a side pressure of small to large efficiently, use for a remarkably deep excavation work, and also work at low cost using a general-purpose machine. CONSTITUTION:A groove of I-type in cross-section is excavated, a center groove at right angle to the groove is excavated to form a groove of T-type in cross- section, reinforcements are laied down in the grooves, and concrete is deposited. Next, a groove in parallel to the I-type groove is excavated along the end surface of the T-type groove, reinforcements are laied down, and concrete is deposited. Then a reinforcement concrete unit wall in which the three cross- sections of I-type, T-type, and H-type are arranged in series, and these unit walls are positioned successively in parallel to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mountain retaining wall, and more particularly to a mountain retaining wall suitable for use in deep underground construction where a wide range of lateral pressure acts from a small lateral pressure to a large lateral pressure, and a construction method thereof.

[0002]

2. Description of the Related Art Conventionally, the shape of a mountain retaining wall is simply a plate, and its cross section is determined so that it can withstand at the portion where the bending moment is maximum, regardless of the magnitude of earth pressure. , Were constructed with the same cross section. In addition, the inside of the mountain retaining wall is made entirely of concrete, rebar,
It was filled with materials such as soil mortar and steel. Therefore, a large amount of material is used and a special construction machine is required to build a large-section mountain retaining wall that can handle large lateral pressure.
High construction cost was required.

The present invention has been made in view of the above circumstances. The purpose is to provide a mountain retaining wall that can efficiently withstand a small lateral pressure to a large lateral pressure without using an excessively large cross section and heavy weight member, and a method for constructing the mountain retaining wall at a low cost using a conventionally used excavating machine. I have a suggestion.

[0004]

The mountain retaining wall according to the first aspect of the present invention is a unit wall of reinforced concrete in which three parts having a horizontal cross section of I type, T type, and H type are arranged in series in the vertical direction. It is characterized in that a plurality of them are arranged in parallel. The construction method of paragraph 2 is to excavate a groove having an I-shaped cross section along the inner surface of the retaining wall to be constructed, and excavate a groove in a direction orthogonal to this groove to form a groove having a T-shaped cross section. After arranging and placing concrete in the groove, excavating an I-shaped groove parallel to the I-shaped groove along the end surface of the T-shaped groove, arranging in the groove and arranging concrete, and the cross section is I
It is characterized in that a unit wall in which three parts of a mold, a T type, and an H type are connected in series is formed, and the unit walls are continuously arranged in parallel.

[0005]

EXAMPLE The earth retaining wall 1 of the embodiment shown in FIG. 1 is made of reinforced concrete and is intended for large depth mountain retaining with a depth of about 50 m from the surface of the ground 3 to the flooring surface 4 or a medium depth self-supporting wall of about 15 m. In addition, a plurality of unit walls 2 arranged in parallel along the vertical direction are continuous to form a single unit.

From the top to the bottom, the unit wall 2 is an I-shaped portion 5 having an I-shaped cross section and a T-shaped portion 6 having a T-shaped cross section shown in FIG. An H-shaped portion 7 having an H-shaped cross section shown in c) is arranged in series. The I-shaped portion 5 is located at the upper position where the lateral pressure acting on the retaining wall is small, and the H-shaped portion 7 is located at the large lower position,
The T-shaped portion 6 is arranged at the intermediate position.

In order to construct this mountain retaining wall 1, the following construction order is used. First, the ground is excavated in the same manner as the conventional underground continuous wall construction, and the I-shaped groove 8 having an I-shaped cross section is excavated (FIG. 3).
A central groove 9 orthogonal to the I-shaped groove 8 is excavated to form a T-shaped groove 10 having a T-shaped cross section (FIG. 4). After arranging the reinforcing bars in this T-shaped groove 10, concrete is placed, and the I-shaped portion 5 having a thickness of 80 cm and a width of 320 cm is placed at the upper position, and the I-shaped portion and the center of a thickness of 80 cm and a width of 240 cm are placed at the lower position. The T-shaped portion 6 in which the pieces are integrated is formed. At this time, the joint streak 12 is projected to the striking joint 11 on both end faces of the I-shaped portion 5 and the central one end surface of the T-shaped portion 6 (FIG. 5).

Next, along the central end face of the T-shaped portion 6, the I-shaped groove 8 is formed.
The parallel groove 13 parallel to is excavated (Fig. 6) to form an H-shaped groove, and a bar is laid in a position below the T-shaped portion 6 in this groove 13 and concrete is poured to make a parallel with a thickness of 80 cm and a width of 320 cm. A unit wall 2 of reinforced concrete in which an I-shaped portion 5, a T-shaped portion 6 and an H-shaped portion 7 are arranged in series from top to bottom to form a piece and form an H-shaped portion 7 integrally with the T-shaped portion 6. (Fig. 7).

The series of steps shown in FIGS. 3 to 7 are repeated to form the unit walls 2 arranged in parallel, and construct the earth retaining wall 1 in which the unit walls 2 and 2 are continuously integrated by the splicing portion 11. To do.

In the process of this construction, if necessary, grout is filled in the square section of the adjacent unit walls 2 and 2 surrounded by the H-shaped portions 7 and 7 to improve the water stopping performance.

[0011]

[Function] This earth retaining wall has three cross sections, I-type, T-type and H-type.
Reinforced concrete unit walls whose parts are arranged in series in the vertical direction are connected in parallel and are integrally formed. In one earth retaining wall, the H-shaped portion is located at a position where the acting lateral pressure is large, and the unit position is located at a small position. The I-shaped portion and the T-shaped portion are arranged at intermediate positions. For this reason, this earth retaining wall can withstand a large lateral pressure as long as it has the same scale or material consumption as compared with the conventional earth retaining wall made of a simple plate.

The H-shaped portion of the earth retaining wall of the embodiment has a large bending strength of 5 times in terms of the second moment of area (I) and 2.8 times in the section modulus (Z) of that of a flat plate having the same weight. Exert.

This method of constructing the earth retaining wall is intended for a large-scale mountain retaining wall, but it is generally used conventionally because excavation of a groove of a relatively small unit and placing of reinforced concrete are repeated. Can be constructed using existing drilling machines. In addition, the I-shaped portion, the T-shaped portion, and the H-shaped portion can be rationally arranged according to the lateral pressure to reduce the man-hours for material construction.

[0014]

The present invention has the following effects.

The rigidity of the mountain retaining wall is improved, and root cutting work can be performed even under large lateral pressure (deep underground). Also,
If used under a small lateral pressure, root cutting work can be performed without support.

Reduction of materials such as steel and concrete,
Construction costs can be reduced by using general-purpose machines and streamlining construction.

A high water-stopping property can be obtained by grouting the portion surrounded by the H-shaped portion.

[Brief description of drawings]

FIG. 1 is a perspective view showing a partial cross section of an earth retaining wall of an embodiment.

2A, 2B, and 2C are cross-sectional views of an I-shaped portion, a T-shaped portion, and an H-shaped portion, respectively.

FIG. 3 is a perspective view of an I-shaped groove formed by excavating the ground.

FIG. 4 is a perspective view of a T-shaped groove formed by excavating the ground.

FIG. 5 is a perspective view of an I-shaped portion and a T-shaped portion formed by placing concrete in a T-shaped groove and placing concrete.

FIG. 6 is a perspective view of a parallel groove excavated along the end face of a T-shaped groove.

FIG. 7 is a perspective view of a unit wall in which an I-shaped portion, a T-shaped portion, and an H-shaped portion which are formed by placing concrete in a parallel groove are arranged in series.

[Explanation of symbols]

1 ... Mountain retaining wall, 2 ... Unit wall, 3 ... Ground, 4 ... Flooring surface,
5 ... I type part, 6 ... T type part, 7 ... H type part, 8 ... I type groove, 9
... central groove, 10 ... T-shaped groove, 11 ... splicing portion, 12 ... joint streak, 13 ... parallel groove.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kakuyuki Takatsu 2-19-1 Tobita-Su, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute

Claims (2)

[Claims] 1. A mountain retaining wall comprising a plurality of reinforced concrete unit walls arranged in parallel, each of which has three parts having a horizontal cross section of I-type, T-type, and H-type arranged in series in the vertical direction. 2. A groove having an I-shaped cross section is excavated along the inner surface of the retaining wall to be constructed, and the groove is excavated in a direction orthogonal to the groove to form a T-shaped groove in the T-shaped groove. After arranging and placing concrete, excavating a groove parallel to the I-shaped groove along the T-shaped groove end face, arranging in the groove and placing concrete,
A method for constructing a mountain retaining wall, characterized in that a reinforced concrete unit wall having three sections of I-shaped, T-shaped, and H-shaped cross sections is made in series, and the unit walls are continuously arranged in parallel.