JP7249663B2 - Pile head connection structure and connection method - Google Patents

Description

The present invention relates to a steel pipe pile head connection structure and connection method for directly connecting the pile head of a steel pipe pile penetrated to hard ground and, for example, a base plate on the column side of a building.

Patent Document 1 (Japanese Patent Application Laid-Open No. 2005-48512) describes a bolt connection mechanism between a steel pipe pile and a column in which a pile head base plate on the steel pipe pile side and a base plate on the column side are jointed with bolts. A pile head base plate to a steel pipe pile. In the mounting structure, it is passed through the outer periphery of the pile head of the steel pipe pile so as to protrude upward, and the periphery of the through hole is welded to the outer periphery of the pile head of the steel pipe pile on the upper surface side of the sub-plate, and the pile head The base plate is provided with a through hole having a size larger than the pile head circumference size of the steel pipe pile, and the pile head base plate has a pile head margin in the through hole so that the bolt hole coincides with the bolt hole of the column side base plate. Disclosed is a structure for attaching a pile head base plate to a steel pipe pile which is overlaid on a sub-plate with its long part projecting and whose through-hole peripheral part is welded to the upper surface of the sub-plate.

Patent Document 2 (Japanese Patent Application Laid-Open No. 2006-336414) does not require welding work or smoothing of the cut surface of the pile head, can easily handle inclination and misalignment of the steel pipe pile, and the horizontal level of the pile head can be adjusted, a pile head structure of a steel pipe pile, a structure of a building, and a pile head treatment method of a steel pipe pile. An inner cover is installed inside the pile head to cover the pile head of the steel pipe pile, and an injection hole larger than the pile head and into which the grout material is injected is drilled, and the inner diameter is slightly larger than the pile diameter of the steel pipe pile. A pile head cap having a cylindrical portion is fitted to the pile head of the steel pipe pile, and a sealing material is provided so as to close the gap between the lower end of the cylindrical portion of the pile head cap and the outer peripheral surface of the steel pipe pile, and injection from the injection hole The grout material is filled between the pile head and the pile head cap of the steel pipe pile.

Patent Document 3 (Japanese Unexamined Patent Application Publication No. 2010-281081) discloses a construction method for steel pipe piles in which a superstructure mounting member is fixed to the head, in which the superstructure mounting member does not need to be welded to the steel pipe pile at the construction site. In this method, a plate and a steel pipe pile with bolt insertion holes are prepared in advance, a plate for the upper structure mounting member is welded to the steel pipe pile at a factory or the like, and the steel pipe pile with the plate is attached. is buried at the construction site and buried in the ground, and the plate and the plate to which the struts of the superstructure are attached are connected with bolts and nuts.

JP-A-2005-48512 JP 2006-336414 A JP 2010-281081 A

In the mounting structure disclosed in Patent Document 1, the receiver that receives the sub-plate from below is basically fixed by welding to the outer periphery of the pile head of the steel pipe pile, and the outer periphery of the pile head of the steel pipe pile and the sub-plate are the first welds. The sub-plate and the pile head base plate are secured by the second weld and the third weld. As described above, the mounting structure disclosed in Patent Document 1 requires welding at four locations including the welding of the support.

In addition, in the construction method disclosed in Patent Document 3, a steel pipe pile with a plate is produced by welding a plate to the head of a steel pipe pile in a factory or the like, and this steel pipe pile with a plate is pressed in or driven while rotating. It is something to do. In this case, since the depth to the hard ground varies depending on the location, in order to ensure that the steel pipe piles reach the hard ground, the depth to the hard ground must be measured in advance and the corresponding length of the steel pipe piles determined. In addition, there is the difficulty that the work must be carried out while maintaining the level of the plate at all times.

Furthermore, in the pile head treatment method disclosed in Patent Document 2, a pile head cap is provided in order to easily treat the inclination and misalignment of the steel pipe pile, and epoxy resin and mortar are placed in the pile head cap. A time-hardening filler such as is injected. Furthermore, the space between the lower end of the pile head cap and the steel pipe pile is closed with a sealing material in order to prevent leakage of the time-hardening filler. Something is disclosed. In this pile head treatment method, the space between the pile head cap and the steel pipe pile is filled with a time-hardening filler such as epoxy resin or mortar. Although it has a sufficient ability to withstand tensile loads, it poses a major challenge.

For this reason, the present invention provides a pile head connection structure and a connection method for directly connecting a steel pipe pile having sufficient strength to both the compressive load and the tensile load from a building and the column base of the building. It is in.

The pile head connection structure according to the present invention is formed in an annular shape having a steel pipe pile that reaches the hard ground at a position corresponding to the column base plate of the building and a notch, and is horizontal near the pile head of the steel pipe pile. and an outer sleeve that is welded as described above, and a through hole placed on the outer sleeve and having an inner diameter larger than that of the steel pipe pile is formed, a reverse bevel is formed around the through hole, and the column base base plate A plurality of bolt holes are formed through the pedestal base plate and the pile head base plate fixed by bolts.

In addition, the pile head connection method according to the present invention includes (1) penetrating the steel pipe pile until it reaches the hard ground at the position corresponding to the base plate of the column base of the building, and (2) the embedded steel pipe pile. In the vicinity of the pile head, an outer sleeve having a notch is tack-welded so as to be horizontal, and (3) a through-hole having an inner diameter larger than the diameter of the steel pipe pile by a predetermined value is formed in the center, and around the through-hole Places a pile head base plate on which a reverse groove is formed on the outer sleeve, (4) performs all-around groove welding of the steel pipe pile and the periphery of the through hole, and (5) the pile head base plate and After the pedestal base plate is brought into contact with the pedestal base plate, holes for bolting are made to pass through at necessary locations, and (6) the pile head base plate and the pedestal base plate are bolted.

In addition, when the steel pipe pile is inclined within the allowable range, the outer sleeve is tack-welded to the steel pipe pile so that it is horizontal to the ground, the tip of the pile head of the steel pipe pile is also cut horizontally, and the outer sleeve A pile head base plate is placed, and the pile head base plate is fixed to the steel pipe pile so as to lie horizontally on the ground by all-around welding between the reverse groove of the through hole of the pile head base plate and the steel pipe pile. It is possible. This makes it possible to fully join the pile head base plate and the column base plate of the steel pipe pile.

In the above method, for example, when the steel pipe pile is slightly inclined, the horizontal cut surface of the steel pipe pile becomes an elliptical shape, but since the outer sleeve is notched, the diameter and shape of the outer sleeve can be changed. Therefore, the outer sleeve can be horizontal, and the pile head base plate holding the pedestal base plate can be horizontally arranged.

In addition, since all-around welding is performed between the steel pipe pile and the reverse groove that expands upward from the pile head base plate, welding of the steel pipe pile and the pile head base plate can be performed at the groove part, so both are strong. can be joined to In addition, this has the effect that the pile head base plate and the steel pipe pile can be connected by two times of welding: tack welding between the outer sleeve and the steel pipe pile, and all-around groove welding between the steel pipe pile and the pile head base plate. have

Furthermore, since the bolt holes for fixing are formed after the pile head base plate on the steel pipe pile side and the pedestal base plate on the building side are brought into contact, it is not necessary to match the bolt holes of both. , the work can be simplified.

FIG. 2 is an exploded perspective view showing a connection structure of pile heads according to the present invention; It is explanatory drawing which shows the connection method of the pile head which concerns on this invention. FIG. 5 is an explanatory diagram of a case where a steel pipe pile is slanted in the method for connecting pile heads according to the present invention.

A pile head connecting structure according to the present invention directly connects a column base of a building and a steel pipe pile buried in the ground. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The pile head connection structure 1 according to the present invention includes, for example, as shown in FIG. An outer sleeve 4 horizontally fixed to the steel pipe pile 3 near the pile head, and a pile placed on the outer sleeve 4 and joined and fixed to the column base plate 2 head base plate 5;

The outer sleeve 4 is an annular body with a predetermined width having an inner diameter slightly larger than the diameter of the steel pipe pile 3, and is formed with a notch 40 to allow the size and shape to be changed. The outer sleeve 4 is located near the pile head of the steel pipe pile 3, below the pile head by a dimension corresponding to the width of the pile head base plate 5, so that it is horizontal in correspondence with the column base plate 2. is adjusted and fixed to the outer periphery of the steel pipe pile 3 by tack welding.

The pile head base plate 5 has a through hole 50 having an inner diameter larger than the outer diameter of the steel pipe pile 3, for example, an inner diameter about 3% larger than the outer diameter of the steel pipe pile. A reverse bevel 51 is formed so as to increase in diameter upward from the inner diameter positioned below.

The connection structure of the pile heads of the steel pipe piles having the above configuration is produced by the method described below.

Normally, the steel pipe pile 3 is rotated and penetrated until it reaches the hard ground at a location corresponding to the column base 20 as shown in FIG. 2(a). In addition, 6 in the drawing indicates the ground surface.

In FIG. 2(b), the outer sleeve 4 is fitted horizontally in the vicinity of the pile head 30 of the steel pipe pile 3 that has been rotated and fixed by tack welding. 2(b), (c), and (d), 41 indicates a weld trace of tack welding.

Then, as shown in FIG. 2(c), the pile head base plate 5 is placed on the outer sleeve 4, and the portion between the reverse groove 51 of the through hole 50 and the steel pipe pile 3 is welded all around and fixed. be done. Reference numeral 51 in the figure denotes a weld mark on the entire circumference.

Further, as shown in FIG. 3(a), even when the steel pipe pile 3 is inserted obliquely , the outer sleeve 4 is fitted horizontally corresponding to the column base plate and fixed by tack welding. be. In this case, the notch 40 of the outer sleeve 4 is slightly opened to correspond to the inclined steel pipe pile 3 . The pile head 30 is then preferably cut or ground horizontally.

In FIG. 3(b), since the pile head base plate 5 is placed on the outer sleeve 4, the pile head base plate 5 is not perpendicular to the steel pipe pile 3 but perpendicular to the plumb line. The reverse groove 51 and the steel pipe pile 3 are welded all around and fixed. In the case of this all-around welding, the weld leaking from the gap between the reverse groove 51 and the steel pipe pile 3 is received by the outer sleeve 4, so the steel pipe pile 3, the reverse groove 51 and the outer sleeve 4 are fixed at this portion. . As a result, in the connecting structure and method according to the present invention, the pile head base plate 5 is welded to the steel pipe pile by two welding operations, ie, tack welding of the outer sleeve 4 and the steel pipe pile 3 and full-circumference welding of the steel pipe pile 3 and the reverse groove 51. 3, the connection work can be simplified.

In the state shown in FIGS. 2(c) and 3(b), the column base plate 2 is brought into contact with the pile head base plate 5. As shown in FIG. In this case, the deviation d between the column base 20 and the steel pipe pile 3 may be within a predetermined range, for example, within 1/100 or within 1/2 of the inner diameter of the steel pipe pile 3 .

As a result, as shown in FIG. 2(d), after the pedestal base plate 2 and the pile head base plate 5 are brought into contact, a bolt hole 7 is drilled at a predetermined position, and a bolt is passed through the bolt hole 7 and fixed with a nut. By doing so, the column base 20 and the steel pipe pile 3 can be connected.

1 Connection structure 2 Column base plate 3 Steel pipe pile 4 Outer sleeve 5 Pile head base plate 6 Ground surface 7 Bolt hole 20 Column base 30 Pile head 40 Notch 41 Tack weld mark 50 Through hole 51 Reverse groove 52 Full circumference weld mark

Claims (2)

a steel pipe pile penetrated to reach hard ground at a position corresponding to a column base plate fixed to a column base of a building ;
an outer sleeve formed in an annular shape having a notch and welded in the vicinity of the pile head of the steel pipe pile so as to be horizontal with respect to the base plate ;
A through-hole placed on the outer sleeve and having an inner diameter larger than that of the steel pipe pile is formed, and a reverse bevel is formed around the through-hole so that the diameter increases upward from the inner diameter positioned below. , The pile head base plate fixed to the steel pipe pile by welding all around between the reverse groove and the steel pipe pile,
A connecting structure of pile heads, characterized in that, after the column base base plate and the pile head base plate are brought into contact with each other, bolt holes are drilled at predetermined positions and fixed by bolts. At a position corresponding to the column base plate fixed to the column base of the building , an outer sleeve having a cut is placed horizontally with respect to the column base plate near the pile head of the steel pipe pile penetrated until it reaches the hard ground. Tack weld so that
A through-hole having an inner diameter larger than the diameter of the steel pipe pile is formed in the center, and a reverse bevel is formed around the through-hole so as to increase the diameter upward from the inner diameter located below the pile head. A base plate is placed on the outer sleeve, and the entire circumference is welded between the reverse saddle Izaki and the steel pipe pile,
After the pile head base plate and the pedestal base plate are brought into contact with each other, a hole for bolting is penetrated at a necessary location, and the pile head base plate and the pedestal base plate are bolted. Method.

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