JP7486392B2 - How to insert the H-shaped retaining steel - Google Patents

Description

The present invention relates to a method for inserting retaining H-shaped steel bars into the ground when constructing retaining walls such as soil cement walls or parent pile horizontal sheet pile walls.

Conventionally, when constructing a retaining wall such as a soil cement wall or a parent pile horizontal sheet pile wall, H-shaped steel bars 3 are inserted into the ground as stress materials, as shown in Figure 3. In this case, however, it is necessary to join multiple H-shaped steel bars 3 with joints 8 depending on various conditions such as the excavation depth, the size of the site, and the vehicles that can be transported to the site.
As shown in FIG. 4, the joint 8 is specifically a bolted joint 2 using a bolt 1 and a splice plate 7, and the bolted joint 2 is connected to the flange 3a and web 3b of the H-beam steel 3, respectively.

On the other hand, when inserting the H-beam 3 into the hole 4 underground, the insertion position is controlled using a guide ruler material 5, such as an iron plate or H-beam installed on the ground surface, as a guide. However, because the shaft 1a of the bolt 1 and the nut 6 protrude outside the flange 3a, the H-beam 3 must be inserted at a distance L from the ruler material 5 by the amount of that protrusion (see Figure 4).

An example of a conventional bolt connection for a retaining H-shaped steel is shown in Figure 5 of JP 2013-144876 A (see Patent Document 1).

JP 2013-144876 A (see FIG. 5)

When inserting a conventional H-beam 3 into the ground, as described above, the shaft 1a of the bolt 1, the nut 6, etc. protrude outside the flange 3a, so the H-beam 3 must be inserted at a distance L from the ruler material 5 by the amount of this protrusion. In other words, the H-beam 3 cannot be inserted along the ruler material 5. As a result, it is necessary to insert the H-beam 3 while measuring the distance from the ruler material 5 to the flange 3a, which creates the problem that it is complicated and difficult to accurately manage the insertion position of the H-beam 3.

In addition, since the H-beam 3 cannot be inserted in line with the ruler material 5, there is no way to constrain the insertion position when the H-beam 3 begins to shift during insertion. In other words, since the ruler material 5 cannot prevent the insertion position from shifting, careful construction is required, which makes the work difficult.

Therefore, in the case of the conventional example, when inserting the H-beam 3 into the ground, there is a problem that needs to be solved: to insert it in a state aligned with the ruler material 5, making it easy to manage the insertion position, and to enable the ruler material 5 to restrain the insertion position and prevent the misalignment when the H-beam 3 begins to shift.

The gist of the present invention for solving the problems of the conventional example is as follows:
This method of inserting retaining H-beams to be inserted into the ground when constructing an earth retaining wall involves arranging U-shaped connecting fittings that function as joints in positions along the inner sides of the webs and flanges of the H-beams that are joined to each other longitudinally by joints, joining the connecting fittings to the webs with bolts, using an H-beam with the connecting fittings welded to the inner sides of the flanges, and inserting the H-beam into the ground with the outer side of the flange of the H-beam aligned along a guide ruler material installed on the ground surface.

Further, the ruler material is formed with a concave groove portion shaped to fit the flange of the H-shaped steel beam, and the H-shaped steel beam is inserted into the ground with the outer portion of the flange aligned with the concave groove portion;
the ruler is installed on both flange sides of the H-shaped steel to be inserted into the ground, and the H-shaped steel is inserted into the ground with the outer sides of both flanges aligned with the respective grooves;
It includes.

According to the method for inserting H-beams for earth retaining according to the present invention, a U-shaped connecting fitting is arranged along the inner side of the web and flange of each of the H-beams to be joined by a joint, and the connecting fitting and the web are joined with bolts. In addition, the connecting fitting and the inner side of the flange are welded to the H-beam, so the bolt shaft and nut do not protrude from the outer side of the flange. Therefore, the H-beam can be inserted into the ground with the outer side of the flange of the H-beam aligned with the guide ruler material, which has the excellent effect of making it easy to manage the insertion position.

The ruler material also has a groove formed in a shape that matches the flange of the H-shaped steel. By inserting the H-shaped steel into the ground with the outer part of the flange aligned with the groove, when the H-shaped steel starts to shift, the groove can hold the insertion position and prevent the shift, providing the excellent effect of preventing the shift.

The ruler material is then placed on both flange sides of the H-beam to be inserted into the ground, and the H-beam is inserted into the ground with the outer parts of both flanges aligned with the respective grooves. When the H-beam begins to shift, the grooves hold the insertion position from both sides of the flanges, providing the excellent effect of further preventing shifting.

FIG. 2 is a plan view showing an H-shaped steel bar and a ruler material according to the first embodiment of the present invention. FIG. 11 is a plan view showing an H-shaped steel bar and a ruler material according to a second embodiment of the present invention. FIG. 11 is a cross-sectional view illustrating a state in which a conventional H-shaped steel beam is inserted into the ground. FIG. 11 is a plan view showing an H-shaped steel bar and a ruler material according to a conventional example.

Next, an embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, the present invention relates to a method for inserting an earth retaining H-shaped steel bar into the ground when constructing an earth retaining wall.
1, reference numeral 11 denotes an H-shaped steel, reference numeral 12 denotes a connecting fitting (joint), reference numeral 13 denotes a drilled hole, and reference numeral 14 denotes a guide ruler material to be installed on the ground surface of the hole 13. Specifically, the ruler material 14 is an iron plate, an H-shaped steel, or the like.

First, an H-shaped bar 11 used in the method for inserting an H-shaped bar according to the first embodiment of the present invention will be described.
As shown in Figure 1, the H-beam 11 is constructed by arranging a U-shaped connecting fitting 12 at a position along the inner side of each flange 11a and web 11b of the H-beams 11 to be joined by the joint, joining the connecting fitting 12 to the web 11b with a bolt 15, and welding the connecting fitting 12 to the inner side of the flange 11a.
In FIG. 1, reference numeral 15a denotes a shaft portion of the bolt 15, reference numeral 16 denotes a nut screwed onto the shaft portion 15a, and reference numeral 17 denotes a welded portion.

Then, as shown in FIG. 1, the H-shaped steel 11 is inserted into a hole 13 in the ground with the outer portion of the flange 11a of the H-shaped steel 11 aligned with a guide ruler material 14 installed on the ground surface.

The H-beam 11 is joined to the connecting fitting 12 and the inner part of the flange 11a by a welded part 17, so that the shaft part 15a of the bolt 15 and the nut 16 do not protrude from the outer part of the flange 11a as in the conventional example.
Therefore, the H-shaped steel beam 11 can be inserted into the ground with the outer portion of the flange 11a of the H-shaped steel beam 11 aligned with the guide ruler material 14. In other words, since it is not necessary to measure the distance from the ruler material 14 to the flange 11b while inserting the H-shaped steel beam 11 as in the conventional example, it is easy to accurately manage the insertion position of the H-shaped steel beam 11.

Next, a ruler member 14 used in a method for inserting an H-shaped retaining bar according to a second embodiment of the present invention will be described.
2, a groove 18 having a shape that fits the flange 11a of the H-shaped steel 11 is formed at the end of the ruler material 14. Then, with the outer portion of the flange 11a aligned with the groove 18, the H-shaped steel 11 is inserted into the ground.
In this way, by inserting the H-shaped steel beam 11 into the ground with the outer portion of the flange 11a aligned with the groove portion 18, when the H-shaped steel beam 11 begins to shift, the groove portion 18 can restrain the insertion position and prevent the shifting.

Furthermore, as shown in Figure 2, it is even better to install the ruler material 14 on both flange 11a sides of the H-shaped steel beam 11 to be inserted into the ground, and insert the H-shaped steel beam 11 into the ground with the outer portions of both flanges 11a aligned with the respective groove portions 18.
In this case, when the H-beam 11 begins to shift, the groove portions 18 restrain the insertion position from both sides of the flange 11a, thereby further preventing the shift.

The method of inserting the retaining H-beam configured as described above involves arranging a U-shaped connecting bracket 12 in a position along the inner side of each flange 11a and web 11b of the H-beams 11 to be joined by the joint, joining the connecting bracket 12 to the web 11b with a bolt 15, and using an H-beam 11 in which the connecting bracket 12 is welded to the inner side of the flange 11a, so that the shaft 15a of the bolt 15 and the nut 16 do not protrude from the outer side of the flange 11a.
Therefore, the H-beam 11 can be inserted into the ground with the outer portion of the flange 11a of the H-beam 11 aligned with the guide ruler material 14, which not only simplifies the construction and management during insertion, but also improves the installation accuracy of the H-beam 11.
In addition, while the installation accuracy of permanent piles is usually 1/100 or less, the installation accuracy of temporary retaining H-beams is 1/100 to 1/150 or less, and for permanent use it is around 1/150 to 1/200, so higher accuracy is required than for permanent piles.

REFERENCE SIGNS LIST 1 Bolt 1a Shaft portion 2 Bolt joint 3 H-beam 3a Flange 3b Web 4 Hole portion 5 Ruler material 6 Nut 7 Splice plate 8 Joint 11 H-beam 11a Flange 11b Web 12 Connecting fitting (joint)
13 drilled hole 14 guide ruler 15 bolt 15a shaft 16 nut 17 welded portion 18 groove

Claims (3)

A method for inserting retaining H-shaped steel into the ground when constructing an earth retaining wall, comprising:
A U-shaped connecting fitting that functions as the joint is disposed at a position along the inner side of each web and flange of the H-shaped steel beams that are joined to each other in the longitudinal direction by the joint, and the connecting fitting and the web are joined with bolts, and an H-shaped steel beam in which the connecting fitting and the inner side of the flange are welded is used,
a method for inserting an H-beam for earth retaining, the method comprising inserting the H-beam into the ground with the outer portion of the flange of the H-beam aligned along a guide ruler material installed on the ground surface. The ruler material is formed with a concave groove portion having a shape that conforms to the flange of the H-shaped steel,
2. The method for inserting an H-shaped retaining bar according to claim 1, wherein the H-shaped bar is inserted into the ground with the outer portion of the flange aligned with the groove. The ruler members are installed on both flange sides of the H-shaped steel to be inserted into the ground,
3. The method for inserting an H-shaped retaining bar according to claim 2, wherein the H-shaped bar is inserted into the ground with the outer sides of both flanges aligned with the respective grooves.

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