JP3641783B2 - Rigidity suppression steel pipe pile head rigid binding material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a head rigid binding material for a landslide-inhibiting steel pipe group pile that is used to rigidly bond the heads of piles when a pair of two piles is used.
[0002]
[Prior art]
Conventionally, various deterrence methods such as a ground anchor method, a reinforcing steel reinforced earth method, a deterrent pile method, a presser embankment method, and a deep foundation pile method have been adopted as measures for stabilizing landslides and cut slopes. Of these methods, the deterrent pile method is a landslide deterrent method that builds a pile on the slope to increase the shear resistance of the natural ground in order to resist the sliding of the landslide mass. Excavation is carried out to a depth that reaches the base, and a steel pipe pile is built in the hole, and the gap is filled with mortar or concrete. In addition to the steel pipe pile, there are various piles such as an H-shaped steel pile, a prefabricated PC pile, a composite pile, and a double steel pipe pile.
[0003]
In order to resist large-scale landslides, methods such as connecting pile heads to each other with concrete or fixing them with ground anchors have been adopted.
[0004]
[Problems to be solved by the invention]
However, in the conventional deterrent pile method, a relatively large-diameter pile such as a large-diameter pile or a medium-diameter pile is used, so the drilling machine must be a large-scale facility in proportion to the diameter. There were problems such as poor workability and poor construction efficiency.
[0005]
In recent years, as a means to greatly improve the workability of the deterrent pile method, the development of a pile method that installs steel pipe piles of small diameter (φ400mm or less) as a set of two piles in a natural ground has been attempted. . According to this construction method, since drilling is possible with a small-scale drilling device, it is expected that workability and construction efficiency much higher than those of conventional methods can be realized. This method of pile construction involves the development of a small-diameter and high-strength steel pipe pile and its joint structure, and work on a scaffold constructed on a slope. Along with the development of drilling machines that can be obtained, there is an urgent need to develop a head connecting material that can easily and reliably rigidly connect the heads of a pair of steel pipe piles built in a natural ground.
[0006]
Therefore, an object of the present invention is to easily and reliably rigidly connect the heads of two steel pipe piles in a group pile construction method in which small-diameter steel pipe piles are installed in the ground as a group pile of two pieces. The object of the present invention is to provide a head tying material for a landslide deterrent steel pipe pile that can be made.
[0007]
[Means for Solving the Problems]
The present invention for solving the above-mentioned problems is a head rigid binding material for rigidly joining the heads of steel pipe piles built in a natural ground, and making a set of two piles,
The head rigid binding material is formed with a hollow hole that substantially matches the head shape of the steel pipe pile, a fitting member fitted to the head of the steel pipe pile, and a central axis on the outer surface of the fitting member A plurality of upper and lower stages are provided along the direction, and the connecting flange is formed with a plurality of bolt holes.
In this case, the hollow hole of the said to-be-fitted member can be made into a female screw hole, and it can also take the aspect screwed by the head part of the said steel pipe pile.
[0008]
Particularly preferably, each of the pair of head rigid members fitted to the steel pipe pile is formed with two upper and lower connecting flanges along the central axis direction, and the pair of head rigid members is a steel pipe. When the pile head is rigidly connected, the upper and lower two-stage coupling flanges provided on the one-side head rigid binder are respectively provided with the upper and lower two-stage coupling flanges provided on the other side head rigid binder. And a structure in which a vertical web for connecting the connecting flanges is provided at a substantially central position of the upper and lower connecting flanges provided on the head rigid member on the one side. It is desirable to do.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0010]
[First embodiment]
FIG. 1 is an installation diagram of a landslide prevention steel pipe group pile, and FIG. 2 is an enlarged view of a main part showing a rigid connection part of a steel pipe pile head.
[0011]
As shown in FIG. 1, the landslide-inhibiting steel pipe pile is directed, for example, in the vertical direction in order to prevent landslides and slope failures (collectively referred to as landslides hereinafter) with respect to natural ground mountains or cut slopes. The pile head of the steel pipe pile 2 built in the ground and the pile head of the steel pipe pile 1 built in the ground in the direction perpendicular to the slope are rigidly connected to each other by the head rigid members 3 and 4. And it is what makes it a group of two piles, and the pile shown in FIG. 1 is installed at predetermined intervals along the horizontal direction (direction passing through the paper surface) of the slope. Of course, you may make it install in multiple rows in the inclination direction of a slope.
[0012]
As the steel pipe piles 1 and 2, steel pipe piles having a small diameter (φ400 mm or less) are preferably used, and a relatively small equipment drilling device is used from a work scaffold (not shown) provided on a slope. Drilling is performed in the natural ground and built in the drilling hole. Then, after the head is rigidly connected by the head rigid members 3 and 4, the inside of the steel pipe piles 1 and 2 and the gap between the hole wall are filled with a grout material such as mortar or concrete.
[0013]
First, as shown in FIG. 3, the head rigid binding material 3 on one side includes a fitting member 5 fitted on the head of the steel pipe pile 1 and a central axis on the outer surface of the fitting member 5. This is a member provided with connecting flanges 6 and 7 in two upper and lower stages along the L direction. The fitting member 5 is a member in which a hollow hole that substantially matches the head shape of the steel pipe pile 1 is formed downward, and usually has an inner diameter that allows for a gap of several millimeters in the outer diameter of the steel pipe 1. A tubular member whose one end is closed is used. As the fitting member 5, the outer shape may be any shape such as a cubic shape as long as the hollow hole can be fitted to fit the head shape of the steel pipe pile 1.
[0014]
The connecting flanges 6 and 7 are bent toward a predetermined angular direction so as to be connectable to connecting flanges 9 and 10 provided on the other head rigid member 4, A predetermined number of bolt holes 6a ..., 7a ... are formed.
[0015]
On the other hand, as shown in FIG. 4, the other head rigid binding material 4 includes a fitting member 8 fitted on the head of the steel pipe pile 2 and a central axis L direction on the outer surface of the fitting member 8. Are provided with connecting flanges 9 and 10 in two upper and lower stages, and a vertical web 11 for connecting the connecting flanges 9 and 10 is provided at a substantially central position of the two upper and lower connecting flanges 9 and 10. ing. The fitting member 8, like the fitting member 5, is a member in which a hollow hole that substantially matches the head shape of the steel pipe pile 2 is formed. Usually, the inner diameter of the outer diameter of the steel pipe 2 allows for a gap of several millimeters. A tubular member having one end closed is used. A predetermined number of bolt holes 9a, 10a,... Are formed on the plate surfaces of the connecting flanges 9, 10.
[0016]
The internal dimension α of the connecting flanges 6 and 7 of the head rigid binding material 3 substantially coincides with the external dimension β of the coupling flanges 9 and 10 of the head rigid binding material 4, and in the rigidly connected state, FIG. As shown in FIG. 2, the connection flanges 9 and 10 of the head rigid binder 4 are positioned between the coupling flanges 6 and 7 of the head rigid binder 3. As described above, the other connecting flanges 9 and 10 are positioned between the one connecting flanges 6 and 7 so that the vertical web 11 can be provided on the other connecting flanges 9 and 10. Further, the presence of the vertical web 11 makes it possible to secure the rigidity of the two steel pipe piles 1 and 2.
[0017]
The connection between the fitted members 5 and 8 and the steel pipe piles 1 and 2 is performed by fitting the head rigid members 3 and 4, and then the lower end edge of the fitted members 5 and 8 and the steel pipe piles 1 and 2. Are joined and fixed by field welding. Note that the hollow holes of the fitted members 5 and 8 may be female screw holes and screwed into the heads of the steel pipe piles 1 and 2.
[0018]
As shown in FIG. 5, the head bending work procedure of the steel pipe piles 1 and 2 is performed by fitting the head rigid bonding material 3 on one side to the head of the steel pipe pile 1. At this time, if the connecting flange 7 hits the other steel pipe pile 2, as shown by the chain line in FIG. It is made to rotate so that it may face to the steel pipe pile 2 side.
[0019]
Next, on the side of the steel pipe pile 2, the head rigid binding material 4 is fitted on the head of the steel pipe pile 2 at a position where the connecting flanges 9, 10 do not hit one of the steel pipe piles 1. The connecting material 4 is rotated so that the connecting flanges 9 and 10 are positioned between the connecting flanges 6 and 7 of the one head rigid connecting material 3.
[0020]
When the head rigid members 3 and 4 are positioned in a predetermined state, fixing bolts, preferably high-strength bolts 12 and 12 are respectively connected to the overlapping connecting flanges 6 and 9 and connecting flanges 7 and 10. ..., the connecting flanges 6 and 9 (7, 10) are connected. Further, the head rigid binding materials 3 and 4 are welded to the steel pipe piles 1 and 2 and fixed firmly. Thereafter, the bolt connecting portion and the welded portion are subjected to rust prevention treatment such as painting to complete the work.
[0021]
In the first embodiment, the bolt holes 6a, 7a, 9a, and 10a formed in the connecting flanges 6, 7, 9, and 10 are circular holes, respectively. 10) By making the bolt holes 6a and 7a (9a and 10a) of 10) long holes, it becomes possible to absorb the construction error of the steel pipe piles 1 and 2.
[0022]
[Second embodiment]
Next, in the second embodiment shown in FIG. 6, the positional relationship between the connecting flanges 6 and 7 on one side and the connecting flanges 9 and 10 on the other side is as shown in FIG. The connection flange 9 of the head rigid binding material 4 is located below the connection flange 6 of the head rigid connection material 3, and the head is also below the connection flange 7 of the head rigid connection material 3 on the lower stage side. The connecting flange 10 of the rigid binding material 10 is positioned. Although this aspect is also within the scope of the present invention, the vertical web 11 cannot be provided in the case of such a connecting flange structure.
[0023]
[Third embodiment]
Furthermore, the connecting flange structure according to the third embodiment shown in FIG. 7 has a plurality of connecting flanges 6, 7, 13 (9, 10, 14 in the illustrated example) along the central axis direction. ) To make the pipe heads 1 and 2 rigid.
[0024]
【The invention's effect】
As described above in detail, according to the present invention, in the pile method for installing small-diameter steel pipe piles as a set of two piles in the ground, the heads of the two pairs of steel pipe piles can be easily and reliably connected to each other. It becomes possible to be rigidly connected.
[Brief description of the drawings]
FIG. 1 is an installation diagram of a landslide-inhibiting steel pipe pile.
FIG. 2 is an enlarged view of a main part showing a rigid connection portion of a steel pipe pile head.
FIG. 3 is a perspective view of a head rigid binding material 3;
4 is a perspective view of a head rigid binding material 4. FIG.
FIG. 5 is a plan view showing a head rigid connection procedure diagram;
FIG. 6 is an enlarged side view of an essential part showing an example of head rigid members 3 and 4 according to a second embodiment.
FIG. 7 is an enlarged side view of an essential part showing an example of head rigid members 3 and 4 according to a third embodiment.
[Explanation of symbols]
1, 2 ... Steel pipe piles, 3 ... Head rigid material, 5/8 ... Fit member, 6/7 ... Flange for connection, 9/10 ... Flange for connection, 11 ... Vertical web, 12 ... Fixing bolt, 13.14 ... Flange for connection

Claims (3)

It is a head rigid binding material for rigidly joining the heads of steel pipe piles built in the ground, and making two sets of piles,
The head rigid binding material is formed with a hollow hole that substantially matches the head shape of the steel pipe pile, a fitting member fitted to the head of the steel pipe pile, and a central axis on the outer surface of the fitting member A head-bonding material for a landslide-inhibiting steel pipe pile, which is provided with a plurality of upper and lower steps along a direction and a connecting flange in which a plurality of bolt holes are formed. The head rigid binding material of a landslide-inhibiting steel pipe assembly pile according to claim 1, wherein the hollow hole of the fitted member is a female screw hole and is screwed into the head of the steel pipe pile. Each set of head rigid members fitted to the steel pipe piles has a connecting flange formed in two upper and lower stages along the central axis direction. In the connected state, the upper and lower two-stage connecting flanges provided on the head rigid member on one side are respectively positioned inside the upper and lower two-stage connecting flanges provided on the other head rigid member. The vertical web which connects these connection flanges in the approximate center position of the connection flange of the upper and lower two steps | paragraphs provided in the said one-side head rigid binding material is provided. The head rigid binding material of the landslide prevention steel pipe pile described in 1.

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