JP2521274Y2 - Joint of steel unit for underground wall - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint of a steel unit for an underground wall.

[0002]

[Purpose of the Invention] The present applicant first connects a steel unit for an underground wall into the ground and penetrates or installs it, and then excavates one side of the unit and welds the exposed excavation side connection part. (See Japanese Patent Application No. 306655). An object of the present invention is to provide a joint of a steel unit body for an underground wall suitable for carrying out the above construction method.

[0003]

The constructional feature of the joint of the steel unit for underground wall of the present invention is that a flat plate-like protrusion extends on both sides flush with one flange on one side of the steel unit for underground wall. In this section, the end faces of both protrusions are formed as slopes, and the base of the flat metal fitting is welded to the inner surface of the tip of the protrusion extending to one side. Of the female metal fitting formed by welding a pair of rods having a diameter larger than the thickness of the male fitting to one side surface of the flat plate on the inner surface of the tip of the projecting portion that projects from the end surface of the male fitting and extends to the other side. Weld one round bar,
The tip of the female fitting to which the other round bar is welded is made to project from the end face of the projecting portion, and is opposed in the state where the corresponding female and male fittings of the adjacent steel unit for underground wall are engaged. The point is that a groove for welding, which is backed by the male fitting, is formed between the end faces of the protrusion.

The base material of the steel unit for underground wall of the present invention is generally an H type (including box H type) steel sheet pile.

[0005]

Description of Embodiments In FIG. Reference numeral 1 is a base material of a steel unit for an underground wall to which the joint of the present invention is applied, and a flat plate-like projection extending in both sides flush with the flanges 3 and 4 on both sides of the rectangular tube portion 2. Of the parts 5, 6, 7, and 8, the end faces 9 and 10 of the protrusions 7 and 8 that are flush with the flange 4 on the excavation side are formed as slopes.

A flat plate-shaped male fitting 11 is attached to the inner surface of the tip of the projecting portion 7. The male fitting 11 has a base portion welded to the inner surface of the projecting portion 7, and its tip portion is the end surface of the projecting portion 7. It projects from 9. Further, female fittings 12 are attached to the inner surface of the tip of the protruding portion 8, and the female fittings 12 are formed by welding round bars 14 and 15 having a diameter larger than the thickness of the male fitting 11 to both end portions of one side surface of the flat plate 13. Female fitting 12 in which a round bar 14 is welded to the inner surface of the protrusion 8 and a round bar 15 is welded.
2 is projected from the end surface 10 of the protruding portion 8 (see FIG. 2).
reference).

[0007] When the steel unit for underground wall is connected and penetrated or built in the ground, the male fitting 11 at the tip of the protruding portion 7 of the adjacent steel unit for underground wall and the tip of the protruding portion 8 Female fitting 12
Engage in the manner shown in FIG. 2, but in this state,
A groove 16 for welding, which is backed with a male fitting 11, is formed between the end surface 9 of the protruding portion 7 and the end surface 10 of the protruding portion 8.

On the side of the flange 3 (ground side), a female metal fitting 17 similar to the female metal fitting 12 is welded to the inner surface of the tip of the projecting portion 5, and the inner surface of the tip of the projecting portion 6 is formed from a round bar. The male fittings 18 are welded, and these are engaged as shown in FIG.

After the steel unit for underground wall provided with the joint as described above is connected and penetrated or built in the ground, the side of the flange 4 is excavated to connect the exposed protrusions 7 and 8. In-situ welding (butt welding) is performed on the groove 16 in the section to integrally connect the tips of the projecting portions 7 and 8 to each other to construct an underground wall serving as an outer wall of the underground structure.

[0010]

[Effects of the Invention] Since the joint of the steel unit for underground wall according to the present invention is as described above, the connection portion of the female and male metal fittings on the excavation side is further integrally joined by field welding. In addition to the basic effect of being able to construct a strong underground wall that serves as the outer wall of an underground structure, the following various effects can be expected. It can be processed with all ready-made materials and is easy and economical. The required clearance can be secured, the steel unit for underground wall can be smoothly penetrated or built, and the required accuracy can be easily secured. Since the on-site welding is butt welding from the front, workability is good, and a welded portion that is reliable in terms of strength can be easily formed. The outer surface of the underground wall is finished flat.

[Brief description of drawings]

FIG. 1 is a plan view of a base material of an underground wall steel unit to which a joint of the present invention is applied.

FIG. 2 is a plan view showing an engagement mode of both male and female metal fittings at an excavation side connection portion of a steel unit for an underground wall provided with a joint of the present invention.

FIG. 3 is a plan view showing a state of a ground side connecting portion of a steel unit body for an underground wall.

[Explanation of symbols]

1: Base material, 2: Square tube, 3, 4: Flange, 5, 6,
7, 8: Protrusion, 9, 10: End surface, 11: Male fitting, 1
2: female fitting, 16: groove.

Claims (1)

(57) [Scope of utility model registration request] 1. A flat plate-shaped projecting portion that extends on both sides flush with a flange on one side of a steel unit for an underground wall,
The end faces of both protrusions are formed into slopes, and the base of the flat metal fitting is welded to the inner surface of the tip of the protrusion extending to one side. Also, on the inner surface of the tip of the protruding portion that extends to the other side,
A front end portion of a female metal fitting in which one round bar of a female metal fitting formed by welding a pair of round bars having a diameter larger than the thickness of the male metal fitting is welded to one side surface of the flat plate, and the other round bar is welded. Is projected from the end face of the projecting portion, and in a state in which the corresponding female and male fittings of the adjacent steel unit for underground wall are engaged, the male fitting is backed between the facing end surfaces of the projecting portion. A joint for a steel unit body for an underground wall, characterized in that a groove for welding is formed.