JPH0419079Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a column member constituting a columnar retaining wall that is installed to prevent the surrounding ground from collapsing during ground excavation. A connection plate in which an air vent hole is formed is fixed to the upper end of a steel pipe for a wall of a row of steel pipe columns that has a water stop part along the direction.
The present invention relates to a connection structure for a column member for creating a columnar retaining wall, in which a steel core material for a soil columnar wall is fixed to the upper surface of the connection plate.

[Prior Art] The above-mentioned column member for creating a columnar retaining wall is such that when creating a columnar retaining wall, a steel pipe column column wall is formed in a portion that is approximately below the groundwater level. Although high water-stopping performance is achieved through the water-stopping function of the steel pipes themselves and the water-stopping function of the water-stopping parts between adjacent steel pipes, very high water-stopping performance is required in areas that are almost above the groundwater level. Therefore, by forming soil pillar row walls, it is possible to reduce the cost, and as a whole, it is possible to obtain a pillar row retaining wall with sufficient water-stopping properties at a cost advantage. By using a steel core material in the upper part, it is easier to remove the steel material after the underground work is completed, which is necessary when construction is carried out above, compared to walls made of steel pipe columns.

And, this pillar member for creating a columnar retaining wall is,
It is usually installed by being inserted into a vertical hole filled with cement milk, and by letting the air inside the steel pipe escape as it is inserted into the vertical hole, the insertion resistance is reduced and the insertion resistance is reduced. In order to ensure this, an air vent hole is formed in the connection plate interposed between the steel pipe and the steel core material.

Conventional column member for creating this type of columnar retaining wall
In X', as shown in FIG. 9, the connecting plate 2' was formed into a donut shape in plan view. For example, a pair of flange portions 3a of a steel core material 3 made of H-beam steel are welded to each of the connecting plates 2', and a hole is formed in the center of the doughnut-shaped connecting plate 2'. , air vent holes 2B' were opened on both sides of the web portion 3b of the steel core material 3 (no literature can be cited).

[Problem that the invention attempts to solve]

In the above-mentioned conventional columnar member for creating a columnar retaining wall, the air bleed holes can be made relatively large, and the air bleed during insertion can be performed smoothly, and the insertion resistance can be sufficiently reduced. The steel core material and the steel pipe are fixed by simply fixing the flange part of the steel core material to a connecting plate fixed to the upper end of the steel pipe. In other words, most of the web part was not fixed to the connecting plate, so the strength of the joint between the two was not very large, and when it was installed in the ground, it received earth pressure and water pressure from the sides.
There was a risk that the connection plate would be deformed.

In view of the above-mentioned circumstances, the purpose of the present invention is to provide a columnar retaining wall that has sufficient water-stopping properties by combining soil columnar walls and steel pipe columnar walls in a cost-effective manner. Moreover, it is an object of the present invention to provide a column member for making a columnar retaining wall that has a large resistance to earth pressure, water pressure, etc.

[Means for solving problems]

The characteristic structure of the connection structure of the column member for creating a columnar retaining wall according to the present invention is a connection with an air vent hole fixed to the upper end of a steel pipe for a steel pipe columnar wall having a water stop part along the axial direction. The air vent hole is formed on each side of the connection part for fixing the steel core part in the radial direction of the steel pipe, and a reinforcing stiffener plate is provided on the lower surface of the connection part. This is due to the fact that it has been established in succession.

[Effect]

In other words, the steel core material can be fixed to the connection plate not only in the vicinity of the outer periphery of the steel pipe, but also in the radial direction of the steel pipe. When using, not only the flange part but also the web part can be fixed to the connection plate, so the fixed part can be increased,
For example, as the weld length increases, the steel core material can be more firmly connected to the steel pipe.

In addition, a reinforcing stiffener plate is connected to the bottom surface of the connection plate to which the steel core part in the radial direction of the steel pipe is fixed, so that the column-shaped retaining wall It is possible to reduce deformation of the connection plate when the production column member is installed in the ground and receives lateral pressure.

On the other hand, since the air vent holes are formed on both sides of the connecting portion of the connecting plate, the opening area thereof can be made sufficiently large.

[Effect of idea]

As a result, the strength at the connection between the steel core material and the steel pipe increases due to an increase in the fixed area, and the stiffener plate installed on the connection plate deforms due to large earth pressure and water pressure. Now I can endure it without having to do anything.

Therefore, by opening the air vent holes sufficiently large to reduce insertion resistance, and by combining soil column row walls and steel pipe column row walls vertically, it is possible to create a retaining wall that has the necessary and sufficient water-stopping properties at an economical cost. For creating columnar retaining walls that can be obtained advantageously while also being able to withstand large lateral pressures and that are excellent overall in terms of performance, construction, and cost. It was made into a pillar member.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, a connecting plate 2 is fixed to the upper end of a steel pipe 1, and an H-beam 3 is fixed to this connecting plate 2 to constitute a column member X for creating a columnar retaining wall. be.

As shown in FIGS. 6 to 8, this pillar member
They are installed side by side in an upright position with the top facing downward to form a retaining wall S.

As shown in FIG. 7, in the portion of this retaining wall S that is approximately below the groundwater level W, the steel pipes 1 of each pillar member X for creating a columnar retaining wall are arranged side by side to form a steel pipe column column wall. As a result, high water-stopping performance can be obtained by the water-stopping function of the steel pipes 1 themselves and the water-stopping function of the water-stopping part interposed between the steel pipes 1, which will be described later. As shown in Fig. 8, by embedding H-shaped steel 3 as a core material in concrete 4 to form a soil column wall, this part, which does not require very high water-stopping properties, can be obtained at a low cost. As a whole, you can
It is possible to reduce costs while having the necessary and sufficient water-stopping properties.

As shown in FIGS. 1 and 4, a pair of water stop portions 5A and 5B are attached to the outer circumferential surface of the steel pipe 1 along the longitudinal direction of the steel pipe 1 with a phase difference of 180°. The pair of water stop portions 5A and 5B have a cross-sectional shape where one 5A is convex and the other 5B is concave.
A convex water stop portion 5A is formed between adjacent steel pipes 1.
and the concave water stop portion 5B are configured to fit together to exhibit a water stop function.

On the other hand, as shown in FIG.
is fixed to the entire periphery of the upper end of the steel pipe 1 by welding. Further, the H-section steel 3 has a maximum diameter smaller than the diameter of the steel pipe 1 in a cross-sectional view, and the end faces of the pair of flange portions 3a and
The entire end surface of the web portion 3b is connected to the connecting plate 2.
It is fixed to the top surface by welding.

Of this connection plate 2, the steel pipe 1
Air vent holes 2B are formed on both sides of the connecting portion 2A to which the web portion 3b of the H-shaped steel 3, which is a steel core portion oriented along the radial direction, is fixed. This air vent hole 2B will be described later when explaining the process, but when inserting the column member X for creating a columnar retaining wall into a vertical hole filled with cement milk,
By removing the air inside the steel pipe 1, insertion resistance is reduced and cement milk is allowed to enter the steel pipe 1. Furthermore, when the H-beam 3 is inserted into the vertical hole, the inside of the steel pipe 1 is removed. After that, the cement milk is made into H-shaped steel 3.
It allows you to reach your surroundings.

By forming the air bleed holes 2B on both sides of the connecting portion 2A, the H-beam 3
By enlarging the fixed part between and the connecting plate 2,
The joining strength between the H-shaped steel 3 and the steel pipe 1 can be increased.

In addition, as shown in Fig. 2, the connection plate 2
This connection plate 2 is on the bottom surface of the connection part 2A.
A reinforcing stiffener plate 6 is attached to prevent deformation.

Therefore, due to the high joint strength between the H-shaped steel 3 and the steel pipe 1 and the presence of the stiffener plate 6, the column member for creating the columnar retaining wall can be installed in the ground G. It can withstand large lateral pressures such as earth pressure and water pressure.

Further, separate rib plates 7 are fixed by welding between the outer peripheral surfaces of the pair of flange portions 3a of the H-shaped steel 3 and the upper surface of the connecting plate 2 with sufficient grooves.

Next, the procedure for constructing a columnar retaining wall S using the column member X for creating a columnar retaining wall having the above configuration will be explained step by step.

<A> As shown in Figure 5 A, the earth auger 8
A vertical hole 9A is excavated in the ground G while pouring cement milk.

<B> As shown in FIG. 5B, an integrated body combining the above-mentioned pillar member X for creating a columnar retaining wall and the guide member 10 is inserted into the vertical hole 9A.

As shown in FIG. 4, this guide member 10 is formed to have approximately the same diameter as the steel pipe 1 of the column member X for creating a columnar retaining wall, and is attached to the peripheral wall of the steel pipe 1. A pair of water stop parts 5
A pair of guide portions 10A and 10B having substantially the same cross-sectional shape as A and 5B are attached.

In this guide member 10, a pair of positioning pieces 11 attached to the lower edge thereof engage with a pair of notches 1a formed in the upper edge of the steel pipe 1, and a pair of positioning pieces 11 attached to the inner peripheral surface of the guide member 10 engage with a pair of notches 1a formed in the upper edge of the steel pipe 1. By abutting the positioning pin 12 on the outer circumferential surface of the flange portion 3a of the H-shaped steel 3, the convex guide portion 10A is located in series above the convex water stop portion 5A of the steel pipe 1, and H of the pillar member X for creating a column-shaped mountain stop wall so that the concave guide part 10B is located above the concave water stop part 5B of the steel pipe 1.
It is fitted onto the section steel 3 and positioned.

<C> After inserting the integral body consisting of the pillar member X for creating a columnar retaining wall and the guide member 10 into the vertical hole 9A, as shown in FIG. Then, another vertical hole 9B is drilled in the ground G while injecting cement milk with the earth auger 8 in a state communicating with this vertical hole 9A.

<D> Into this other vertical hole 9B, as shown in FIG. Insert it along the integral part inserted in 9A. In other words, the concave guide portion 10 of the previous integral piece
After fitting the convex water stop part 5A of another integral part to B, or conversely, fit the concave water stop part 5B of another integral part to the convex guide part 10A of the previous integral part.
After fitting the water-stop parts 5A and 5B to each other, while guiding the water-stop part 5B or 5A to it by either guide part 10A or 10B.
Fit them together by sliding them.

<E> After a plurality of pillar rows are formed by repeating the steps <A> to <D> in this way, as shown in FIG. Take out the only parts one by one,
The guide member 10 is combined with another pillar member X for creating a columnar retaining wall and repurposed.

<f> By repeating the above steps, the sixth
As shown in the figures through FIG. 8, a continuous columnar retaining wall S is completed.

[Another example]

Next, another example will be listed.

<1> As the core material for forming the soil columns, instead of the H-shaped steel 3, a shaped steel such as a C-shaped steel or a Z-shaped steel, or a built-up L-shaped member or H-shaped member, etc. is used. They may be collectively referred to as the steel core material 3.

Furthermore, when the H-shaped steel described in the previous embodiment is used as the steel core material 3, the portion of the connection plate 2 to which the web portion 3b is fixed becomes the connection portion 2A; When various materials such as those described above are used as the steel core material 3, the portion where the steel core material portion in the radial direction of the steel pipe 1 is fixed becomes the connection portion 2A. .

<2> The cross-sectional shape of the water stop portions 5A and 5B is changed to, for example, an L-shape or a U-shape instead of that described in the previous embodiment. In this case, the cross-sectional shapes of the guide portions 10A and 10B of the guide member 10 may also be made to match that.

<3> A guide member 10 having a semi-cylindrical cross section is used. In this case, the guide part 10A
is attached only to the peripheral surface of the protruding side, and this guide part 1
The construction can be carried out by sequentially adding column rows toward the side where 0A is attached.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

1 to 8 show an embodiment of the connection structure of column members for creating columnar retaining walls according to the present invention, in which FIG. 1 is a cross-sectional view, FIG. 2 is a partially enlarged side view, and FIG. 3
The figure is an enlarged sectional view of the main part, Figure 4 is a perspective view of the guide member set in place, Figure 5 A to E are sectional views showing the construction procedure for columnar retaining walls, and Figure 6 is a columnar retaining wall. The vertical cross-sectional view of the retaining wall, FIGS. 7 and 8, are respectively a cross-sectional view taken along the - line and a cross-sectional view taken along the - line in FIG. 6. FIG. 9 is a cross-sectional view corresponding to FIG. 1 showing a conventional example. 1... Steel pipe, 2... Connection plate, 2A...
Connection part, 2B...Air vent hole, 3...Steel core material,
5A, 5B... Water stop part, 6... Stiffener plate.

Claims (1)

[Scope of utility model registration request] A connecting plate 2 in which an air vent hole 2B is formed is fixed to the upper end of a steel pipe 1 for a steel pipe column wall having water stop parts 5A and 5B along the axial direction, and a soil layer is attached to the upper surface of this connecting plate 2. Steel core material for column walls 3
A connection structure for a columnar member for creating a columnar retaining wall, in which the connection plate 2 has
The air vent holes 2B are formed on both sides of the connecting portion 2A for fixing the steel core portion in the radial direction of the steel pipe 1, and a reinforcing stiffener plate 6 is provided on the lower surface of the connecting portion 2A. A connection structure of column members for creating columnar retaining walls that are connected in series.