JP3218518B2 - Excavator guide wall in underground diaphragm wall method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide wall of an excavator installed in the ground prior to excavation of a slot in an underground continuous wall.

[0002]

2. Description of the Related Art Since the vertical accuracy of a wall in an underground continuous wall method depends on the accuracy of excavation of a slot by an excavator, a pair of guides is provided along a wall construction position as shown in FIG. When the walls 1 and 1 are installed at intervals equal to the width of the wall, and the excavator 2 is a wall drill excavator, one side of the base 3 is grounded to the horizontal top ends 1a and 1a. The drill 4 faces the guide wall.

The installation of the guide walls 1 and 1 is performed as shown in FIG.
As shown in (A) and (B), a stepped groove 5 is dug, a formwork 6 is assembled in the groove, and furthermore, reinforcement is performed and concrete is cast in place.

[0004]

In the guide walls 1, 1 formed by casting in place, the accuracy is determined by the framework of the formwork 5, and a slight inclination is not allowed as a guide for a machine for excavating a deep slot. Although it is a preparation process for underground wall construction, it takes unexpected labor and days for construction.

[0005] In addition, in the case of cast-in-place, there is a lack of adaptability of a swift work for extension of construction, and the construction cannot be diverted after construction is completed. It was uneconomical, such as hanging.

The present invention has been conceived in order to solve the above-mentioned conventional problems, and an object of the present invention is to precast a guide wall to enable quick installation and conversion, thereby shortening the number of construction days and saving labor. It is another object of the present invention to provide a guide wall having a new configuration that can reduce the amount of waste as industrial waste.

[0007]

The feature of the present invention according to the above object is that a guide wall is constituted by a wall body made of precast concrete having an L-shaped cross section and a top end made of cast-in-place concrete. After installing the pair of wall bodies back to back in the groove,
The top end is formed by casting and integrated with the wall body.

[0008]

1 to 5 show an embodiment of the present invention. In the drawings, reference numeral 11 denotes a wall body having an L-shaped cross section and an overhang portion 12 integrally formed at a lower end, and a reinforcing bar 13 at an upper end. It projects at regular intervals, and a steel angle 14 for connection is embedded in the inner corner of the side end.

[0009] Such a wall body 11 is manufactured in a work yard separate from the construction site of the underground continuous wall, and is carried into the construction site. Then, as shown in FIG. Opposite to each other, both angles 14,
After the joint plate 15 transferred to 14 is welded to the angles 14 and 14 to be integrally connected, as shown in FIG. 3, the joint plate 15 is installed in a groove 16 excavated along the construction position of the wall body.

As shown in FIG. 2, the plurality of wall bodies 11, 11 installed in the groove 16 are connected together by welding adjacent angles to each other using a flat plate or the like. A guide wall is formed by the linked body having a length.

When the installation and connection of the wall bodies 11, 11 are completed, as shown in FIG. 4, the gap of the groove outside the wall body is backfilled to the upper end of the body, and then the top end mold for height adjustment is formed. The frame 17 is assembled, reinforcement is further arranged, and concrete is poured.

As a result, as shown in FIG. 5, a top end 18 made of cast-in-place concrete is integrally formed on the upper ends of the wall bodies 11, 11 made of precast concrete. In such a guide wall, except for the top end 18, it can be diverted as another guide wall, and only the top end portion that is difficult to divert is disposed of as waste.

[0013]

According to the present invention, as described above, the guide wall is made of a precast concrete wall body,
Since it consisted of the top of cast-in-place concrete,
The following effects are obtained.

[0014] The design accuracy is greatly improved by the precasting of the wall body, and the part made of cast-in-place concrete is only the top end. Therefore, the number of construction days is also reduced.

[0015] The wall body can be manufactured at any time within the float time and can be diverted, and only the top end of cast-in-place concrete needs to be disposed of as waste, and there is little waste such as formwork. Therefore, the amount of industrial waste generated is reduced, and the cost required for disposal is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a wall main body of a guide wall according to the present invention.

FIG. 2 is a cross-sectional plan view showing a connected state of a plurality of wall bodies.

FIG. 3 is a vertical sectional side view showing a state where a wall main body is installed in a groove.

FIG. 4 is a longitudinal sectional side view showing a framework state of a formwork at a top end.

FIG. 5 is a vertical sectional side view of the guide wall of the present invention.

FIG. 6 is an explanatory diagram of an example of an underground continuous wall construction method.

FIG. 7 is an explanatory view of construction of a guide wall by cast-in-place concrete.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Wall main body 12 Projection part 13 Reinforcement 14 Channel 15 Joint plate 16 Groove 17 Formwork 18 Top end

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Toshihiko Iwasaki 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (56) References JP-A-5-93423 (JP, A) JP-A Sho53 −20612 (JP, A) Japanese Utility Model 4-4-926 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 5/20 102 E02D 5/18 102 E02D 13/04 E02D 27 / 01 102

Claims (1)

(57) [Claims] 1. A guide wall comprising a wall body made of precast concrete having an L-shaped cross section and a top end for height adjustment made of cast-in-place concrete,
A guide wall for an excavator in an underground continuous wall method, wherein a pair of the wall bodies is installed in a groove back to back, and the top end is formed and integrated with the wall body.