JP2992912B2 - Structure of steel element for continuous 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 structure of a steel element which is connected to an excavation trench when constructing an underground continuous wall.

[0002]

2. Description of the Related Art When constructing an underground continuous wall, there is a construction method in which steel elements are connected to each other in an excavation trench while being connected.
In this method, a steel element 1 having a joint 2 as shown in FIG. 3 is used. And, as shown in FIG.
The steel element 1 is erected while being connected to the excavation trench, and the interior is filled with concrete 4 as necessary to construct an underground continuous wall. When the steel element 1 is used as described above, the construction management becomes easier and faster than that of the concrete-based underground continuous wall, and the reliability of strength can be enhanced.

[0003]

An object of the present invention is to further increase the strength of a steel element having the above-mentioned advantages, particularly the strength of a connecting portion,
An object of the present invention is to provide a highly reliable steel element for an underground continuous wall.

[0004]

An embodiment of the present invention will be described below with reference to the drawings. <A> Steel Element Main Body As shown in FIGS. 1 and 3, a square steel pipe 11 and the like are used for the main body of the steel element 1. This square steel pipe 11
Because of the excellent cross-sectional performance, if a concrete is filled in, the function will be exhibited with about half the thickness of the concrete continuous wall. Therefore, on a narrow land in an urban area or a land with a high land price, the structural space can be effectively used by reducing the wall thickness. In addition, the side surface becomes a flat steel material surface and can be used as it is as a main body wall. In the case of the conventional concrete continuous wall, since the surface of the concrete is rough, a wall surface treatment such as mortar coating and a treatment such as a block stacking inside the concrete continuous wall are required. Such processing is unnecessary,
It is economical. Further, by using a steel material having good weldability, a steel member such as the stud 5 can be easily welded to the side surface as shown in FIG. Therefore, processing at the construction site becomes easy, and the construction period can be shortened.

<B> Joint The joint 2 protrudes from a corner of the rectangular steel pipe 11 in parallel with the extension direction of the underground continuous wall, as shown in FIGS. For example, the half-cut straight steel sheet pile 21 is welded along the corners of the square steel pipe 11. This straight steel sheet pile 21
At the end of the connecting part 2 for connecting the steel elements 1
2 is provided. The connecting portion 22 may be configured to connect structures having a C-shaped cross section as shown in FIG. 1, or may be formed of a C-shaped body having a cross-section and a pipe-shaped body inserted therein. When these connecting portions 22 are connected, the lower end of the connecting portion 22 of one steel element 1 is inserted by sliding the lower end of the connecting portion 22 of the adjacent steel element 1 while sliding.

<C> Reinforcing Joint As shown in FIG. 1, the reinforcing joint 3 is provided at an intermediate portion of the above-mentioned joint 2 so as to protrude in parallel with the joint 2. The reinforcing joint 3 has a shape that can be connected to each other, for example, is configured to have the same shape as the joint 2, and is joined to a side surface of the square steel pipe 11 between the joints 2 by welding. The joining position is a position where the rigidity of the connection structure between the steel elements 1 can be efficiently increased, and is a position off the center of the steel element 1 in the thickness direction of the continuous underground wall. That is, the center line L shown in FIG.
Join at a position outside of The reason will be described with reference to FIG. FIG. 5 is a schematic plan view of the steel element 1 buried underground, and a large earth pressure and water pressure are acting on one side surface of the steel element 1. In such a state, the steel element 1 bends and deforms, and one side of the steel element 1 contracts and the other side expands. Therefore, the boundary portion (center line L) between the contraction side and the extension side becomes a neutral portion where neither contraction nor extension occurs, and providing the reinforcing joint 3 in this range has little significance for reinforcement. The place where reinforcement by the reinforcement joint 3 is necessary is a part where expansion and contraction and extension occur. Therefore, the reinforcing joint 3 is provided at a position deviated from the center line L, and the rigidity of the connection structure between the steel elements 1 can be efficiently increased.

[0007]

Since the present invention has been described above, the following effects can be obtained. That is, by providing the reinforcing joint at a position off the center in the thickness direction of the steel elements, the rigidity of the connection structure between the steel elements can be efficiently increased. Therefore, a highly reliable steel element for an underground continuous wall can be economically produced without providing a joint at an unnecessary place.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of a three joint.

FIG. 2 is an explanatory view of an embodiment of a four joint.

FIG. 3 is a schematic explanatory view of a steel element.

FIG. 4 is an illustration of a method of constructing an underground continuous wall using a steel element.

FIG. 5 is a schematic plan view of a steel element buried underground.

Claims (1)

(57) [Claims] In building 1. A diaphragm wall, Oite structural steel elements writing denominated drilling groove, projecting from the extending direction of the diaphragm wall of the steel element body, the steel elements with each other Between a pair of joints to be connected, a reinforcing part is located at a position off the center in the thickness direction of the underground continuous wall .
The structure of a steel element for a continuous wall, characterized by having a joint .