JPH093876A - Soil cement underground continuous wall and its steel building materials - Google Patents

Abstract

(57) [Summary] [Purpose] A soil cement underground continuous wall and its steel building material that secures a sufficient amount of fogging at the joints of steel building materials and has good waterproofness against cracks. [Structure] In a soil cement underground continuous wall 1 constructed by a soil mixing wall method, web members 3b, 4b and the web members 3b, 4b are provided in each columnar hole 2 drilled by a multi-axis kneading auger machine. Flange members 3a, 3a, 4a, 4a joined to one or both ends of 3b, 4b
When the flange member is connected to the one end, the connecting portions 5 are provided on both sides of the flange, and when the flange members 3a, 3a, 4a and 4a are connected to the both ends. Has connecting portions 5 on both sides of one or both of the flange members, and the steel building materials having different widths of the flange members (3a and 4a) having the connecting portions 5 are alternately aligned with the holes, and The connecting portions 5 adjacent to each other,
A soil cement underground continuous wall, which is constructed by arranging and engaging 5 with each other, and a steel building material therefor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil cement underground continuous wall and its steel building material. It can be used for soil cement underground continuous wall constructed by the soil mixing wall method and its steel building materials.

[0002]

2. Description of the Related Art Conventionally, the soil mixing wall method is known as the SMW method, and is a method of creating a wall body on site by mixing a hardening liquid suitable for the purpose, such as cement milk and Bennite liquid, with soil in situ. Therefore, the soil cement underground continuous wall can be constructed by this method. In this soil cement underground continuous wall, a steel building material is arranged as a core material, and the state is shown in FIG. In FIG.
Holes 10 are formed in a columnar shape by a multi-axis kneading auger machine (usually 3 axes) of the SMW method, H-shaped steel building materials 11 having connecting portions 12 on both sides are arranged, and a soil cement underground continuous wall 1 is built.

[0003]

By the way, in the soil cement underground continuous wall 1 in FIG. 5, it is necessary to maintain the water blocking property at the joint portion 12 of the steel building material 11, and therefore, at the joint portion 12. Ensure that the amount of soil cement cover is sufficient. However, with the structure in FIG. 5, the line connecting the intersections a and b, which are the boundaries of the mutual side surfaces of the adjacent column-shaped soil cement columns 13, passes through the portion of the connecting portion 12 of the steel building material 11. Since a crack is generated at the intersection points a and b of the soil cement column 13, the crack is caused by the connecting portion 12 of the steel material 11 made of steel.
In addition to impairing the water blocking performance of the soil cement underground continuous wall 1, it causes corrosion in the vicinity of the steel material 11 which is the core material, which is a problem.

In view of the above-mentioned problems of the prior art, an object of the present invention is to secure a more sufficient amount of fogging at a connecting portion of a steel building material and to have a water resistance that is good in waterproofness against cracks. To provide a cement underground continuous wall and its steel building material.

[0005]

The soil cement underground continuous wall of the present invention is a columnar column drilled by a multi-axis kneading auger machine in the soil cement underground continuous wall constructed by the soil mixing wall method. In each hole, the web member and a flange member joined to one end or both ends of the web member are formed, and when a flange member is joined to the one end, connecting portions are provided on both sides of the flange. In the case where flange members are connected to both ends, one or both of the flange members have connecting portions on both sides, and the steel building materials having different widths of the flange members having the connecting portions are alternately provided in the holes. It is constructed by aligning with, and engaging and arranging the connecting portions adjacent to each other. Further, the present invention is a steel building material used for the soil cement underground continuous wall, comprising a web member and a flange member joined to one end or both ends of the web member, at the one end When the flange members are connected, the flanges have connecting portions on both sides, and when the flange members are connected to both ends, the flange members have connecting portions on both sides of one or both of the flange members. It is composed of a steel building material consisting of a combination of two types of flange members having different widths. Moreover, this invention is a steel building material used for the said soil cement underground continuous wall, Comprising: The steel building material which consists of a component of a flange member and a web member couple | bonds plate-shaped steel material and H-section steel. The plate-shaped steel material has connecting portions on both sides, is joined to the outer surface of one or both flanges of the H-section steel along the length direction, and is formed into a columnar hole. The steel building material to be arranged is made of a steel building material in which the width of the plate-shaped steel material is alternately different.

[0006]

According to the present invention, in the soil cement underground continuous wall, the width of the flange member, which is composed of the components of the flange member and the web member and has the connecting portions on both sides, is formed in each of the drilled columnar holes. Different steel building materials are alternately aligned with the holes, and the connecting portions adjacent to each other are engaged with each other to be built up and arranged, thereby arranging adjacent columnar columns as illustrated in FIG. The line connecting the intersections a and b, which is the boundary between the side surfaces of the soil cement pillar 9, does not pass through the connecting portion 5 of the steel building material. Therefore, even if a crack occurs at the intersections a and b of the soil cement column, the crack can avoid the connecting portion of the steel material 5 made of steel. Also, by alternately arranging steel building materials with different widths of the flange members, it is possible to secure a large amount of soil cement fogging at the connection parts of the steel members, and the drilled holes have the same diameter. It is more advantageous than that.

[0007]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a soil cement underground continuous wall 1 constructed by the SMW method. The columnar holes 2 are drilled by a triaxial kneading auger machine. Each of the holes 2 is composed of the components of the flange members 3a, 4a and the web members 3b, 4b having the connecting portions 5 on both sides, and the steel building materials 3, 4 having different widths of the flange members (3a and 4a) are alternately arranged. Then, the connecting portions 5 and 5 which are aligned with the hole 2 and which are adjacent to each other are engaged with each other to be installed and arranged. As shown in FIG. 1, the steel building materials 3 and 4 have connecting portions 5 for the upper and lower flange members, and a detailed example thereof is shown in FIG.

FIG. 2 shows another soil cement underground continuous wall 1 constructed by the SMW method. The columnar holes 2 are
Drill holes with a triaxial kneader auger. Each hole 2 is composed of the flange members 3a and 4a having the connecting portions 5 on both sides and the web members 3b and 4b, and the flange member (3a
And 4a) steel building materials 3 and 4 having different widths are alternately aligned with the hole 2 and the connecting portions 5 and 5 adjacent to each other are engaged and installed. As shown in FIG. 2, the steel building materials 3 and 4 have the connecting portion 5 only for the upper flange member, and a detailed example thereof is shown in FIG.

In FIG. 3, a steel building material consisting of a flange member and a web member is joined by joining an H-shaped steel 6 and a plate-shaped steel material 7 having a connecting portion 5 to both outer sides of the flange 6a of the H-shaped steel 6. An example will be shown below. The overall width of the plate-shaped steel material 7 differs between the left and right plate-shaped steel materials 7, 7, and the left plate-shaped steel material 7 is longer than the right-side plate steel material 7. In addition, the steel building material 4 of this example is H
The flange 6a of the shaped steel 6 and the plate-shaped steel material 7 form upper and lower flange members, and the web 6b of the H-shaped steel 6 forms a web member. It is one example of the connection mode of the component of a web member and a flange member in the steel building material of this invention. The flange 6a and the plate-shaped steel material 7 are joined by welding. It may be performed by bolting or the like. FIG. 4 shows a steel building material composed of a flange member and a web member, an H-shaped steel material 6 and a plate-shaped steel material 7 having a connecting portion 5 on one outer side of a flange 6 a of the H-shaped steel material 6.
An example of joining and forming is shown. As in the case of FIG. 3,
The plate-shaped steel material 7 on the left side is longer than the plate-shaped steel material 7 on the right side. In the steel building material 4 of this example, the lower flange member is formed only by the flange 6a of the H-shaped steel 6. FIG.
The plate-shaped steel material 7 in FIG. 4 is a plate-shaped steel material having claw portions at both ends. The plate-shaped steel material 7 has a plate thickness of, for example, 8
It is possible to use a shaped steel for a continuous underground wall which is continuously formed in the ground by using a thin-walled product having a thickness of about mm. A straight steel sheet pile can be used as the plate-shaped steel material having connecting portions on both sides in the present invention.

Due to the structure of the soil cement underground continuous wall in which steel building materials having different widths of the flange members are alternately arranged, an intersection a which is a boundary between adjacent side faces of the soil cement pillars 9 is formed. , B does not pass through the connecting portion 5 of the steel building materials 3 and 4. Therefore, even if cracks occur at the intersections a and b of the soil cement columns 9, the cracks can prevent the steel material from reaching the connecting portion. Further, by displacing the connecting portion 5 in this manner, it is possible to secure a larger amount of soil cement fogging at the connecting portion of the steel member by about 9 mm than in the conventional case.

[0011]

EFFECTS OF THE INVENTION According to the present invention, the water-stopping property of the steel-made steel material at the connecting portion can be satisfactorily maintained, and the corrosion of the connecting portion due to the water immersion due to the crack of the soil semet can be prevented. Further, steel building materials having different widths of the flange members are alternately arranged, and intersections a and b of the soil cement columns are arranged.
To separate the steel-steel material connecting portion from the above to increase the amount of soil cement fogging at the steel-building material connecting portion, which is also advantageous in terms of water stoppage.

[Brief description of drawings]

FIG. 1 is a view showing an example of a soil cement underground continuous wall of the present invention.

FIG. 2 is a diagram showing an embodiment of another soil cement underground continuous wall of the present invention.

FIG. 3 is a diagram showing an example of a steel building material of the present invention.

FIG. 4 is a view showing an example of another steel building material of the present invention.

FIG. 5 is a diagram showing an example of a conventional soil cement underground continuous wall.

[Explanation of symbols]

 1 soil cement underground continuous wall 2 hole 3 steel building material 3a flange member 3b web member 4 steel building material 4a flange member 4b web member 5 connecting portion 6 H-shaped steel 6a flange 6b web 7 plate steel material 8 claw portion 9 soil cement Pillar 10 Hole 11 Steel building material 12 Connecting part 13 Soil cement pillar

Claims (3)

[Claims] 1. In a soil cement underground continuous wall constructed by a soil mixing wall method, a web member and one end of the web member or one end of the web member is provided in each columnar hole drilled by a multiaxial kneading auger machine. It is composed of a component with a flange member coupled to both ends, and has a connecting portion on both sides of the flange when the flange member is coupled to the one end, and when the flange member is coupled to the both ends. One or both of the flange members have connecting portions on both sides, and steel building materials having different widths of the flange members having the connecting portions are alternately aligned with the holes, and the connecting portions adjacent to each other are engaged. Soil cement underground continuous wall characterized by being integrated and installed. 2. A steel building material for use in a soil cement underground continuous wall according to claim 1, comprising a web member and a flange member connected to one end or both ends of the web member. When the flange member is connected to one end, it has a connecting portion on both sides of the flange, and when the flange member is connected to the both ends, it has a connecting portion on one or both sides of the flange member, A steel building material comprising a combination of two types of flange members having the connecting portions and having different widths. 3. A steel building material comprising a flange member and a web member as constituent elements is formed by joining a plate-shaped steel material and an H-shaped steel, and the plate-shaped steel material has connecting portions on both sides, The width of the plate-shaped steel material of the steel building material, which is joined to the outer surface of one or both flanges of the H-section steel along the length direction and is arranged in the holes drilled in columnar shapes, is made to have different widths alternately. The steel building material according to claim 2.