JP2001011850A - Joint structure of steel pipe pile, and joint method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure of a steel pipe pile and a joint method capable of simplifying work and having high strength, reducing a construction period of time even in a constrution site and having a long-term reliability obtained at a low cost. SOLUTION: An inside joint pipe 3 or an inside joint material having a pin insertion hole is so fixed to the inside circumferential surface of the end of one steel pipe pile 1 to be connected that the pin insertion hole is projected from the pile end. An outside joint pipe 4 thicker than a steel pipe pile base metal and having a pin insertion hole coinciding with the pin insertion hole of the inside joint pipe or the inside joint material is fixed to the end of the other steel pipe pile 2, the outside joint pipe is fitted to the circumferential surface of the inside joint pipe or the inside joint material to make the inside joint pipe or the inside joint material coincide with the pin insertion hole of the outside joint pipe, and one steel pipe pile is firmly connected to the other steel pipe pile by inserting a fixed pin 5 into the pin insertion hole to fix.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a joining structure and a joining method for steel pipe piles.

[0002]

2. Description of the Related Art Conventionally, welding has been widely used for joining steel pipe piles. However, when the diameter of the steel pipe increases and the thickness of the steel pipe increases, the problem of longer welding time becomes apparent, resulting in a problem of welding cost and a longer waiting time for the pile driving machine, resulting in a longer construction period. There's a problem.

[0003] As a joining method for solving such a problem of the weld joint, for example, the following non-weld joint has been proposed. (1) Method using an adhesive There is a method described in JP-A-5-156628. In this method, a joint pipe is fitted to one steel pipe pile to be joined, protruded from the pile end and fixed, and the other steel pipe pile to be joined to one steel pipe pile is fitted to the joint pipe of one steel pipe pile. In this method, after temporarily fixing the pile burial construction load, the adhesive is injected into the gap between the joint pipe and the other steel pipe pile and solidified. In this method, a long waiting time is required to solidify the adhesive and develop the bonding strength, quality control of the adhesive is difficult due to variations in the construction temperature, etc. Since this is performed by the adhesive force with the steel material, there is a problem that sufficient bonding strength cannot be obtained when an out-of-plane force acts on the bonding surface due to the action of the bending moment. There is also a problem of reliability for high durability. (2) Method using screws There is a method described in JP-A-8-60652.
According to this method, there is a problem that the processing cost is high because extremely precise processing of the thread portion is required. (3) Method by taper ring tightening There is a method described in JP-A-9-119132. In this method, there is a problem that precise processing is required in order to eliminate play of engagement of the annular projections on the steel pipe and the tapered sleeve. On the other hand, if there is play, sufficient joint rigidity cannot be obtained. In addition, since the tapered sleeve and the tapered ring protrude outside the steel pipe, there is a problem that the driving of the pile may be hindered.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a joining structure and a joining method for steel pipe piles which are easy to process and have high yield strength and have long-term reliability.

[0005]

Means for Solving the Problems The present invention provides the following (1):
To (9). (1). One steel pipe pile having a pin insertion hole formed at a portion where the pin insertion hole protrudes from the end of the steel pipe pile at one end; and a steel pipe pile mother having an inner diameter larger than the outer diameter of the inner joint pipe at the end. The other steel pipe pile, which is thicker than the material and has the outer joint pipe fixed with the pin insertion hole that matches the pin insertion hole of the inner joint pipe when fitted, is fitted at the inner joint pipe and the outer joint pipe part. A joint structure of the steel pipe piles, wherein the inner joint pipe and the outer joint pipe are fixed by a fixing pin inserted into the pin insertion hole aligned with the inner pipe. (2). At the end of one steel pipe pile, an inner joint pipe having an outer diameter and a pin insertion hole inscribed in the steel pipe pile is fixed so as to form a fitting portion where the pin insertion hole protrudes from the steel pipe pile end. The other end of the steel pipe pile has an inner diameter larger than the outer diameter of the inner joint pipe and is thicker than the steel pipe pile base material. Fixing the outer joint pipe having, fitting the inner joint pipe and the outer joint pipe to match the pin insertion holes of the inner joint pipe and the outer joint pipe, and inserting a fixing pin into the pin insertion hole to fix. Characteristic method of joining steel pipe piles. (3). In (1), the inner joint pipe fixed to the end of one of the steel pipe piles has an outer diameter slightly smaller than the inner diameter of the steel pipe pile, and has a plurality of open ends at the fixed side to the steel pipe pile. A joint structure for a steel pipe pile, which is provided with a notch and is fixed to an inner peripheral surface of an end of the steel pipe pile. (4). In (1), the inner joint pipe fixed to the end of one of the steel pipe piles includes a plurality of arcuate split plates each having a plurality of cutouts having open ends on the side where the steel pipe piles are fixed, and the gap between adjacent arcuate split plates. A steel pipe pile joining structure characterized by being annularly fixed to the inner peripheral surface of one steel pipe pile end so that a slight gap is formed. (5). Inner joint formed by fixing a plurality of strip-shaped flat plates having pin insertion holes to the inner peripheral surface in an annular shape such that the pin insertion holes protrude from the end of the steel pipe pile and a slight gap is formed between adjacent flat plates. One of the steel pipe piles having a material and an inner diameter slightly larger than the virtual outer diameter of the inner joint material, and having a thickness larger than that of the steel pipe pile base material, and a pin insertion matching the pin insertion hole of the strip-shaped flat plate when fitted. The other steel pipe pile to which the outer joint pipe with holes is fixed,
A joint structure for steel pipe piles, wherein an inner joint member and an outer joint tube are fitted to each other, and the inner joint member and the outer joint tube are fixed by a fixing pin inserted into a pin insertion hole which is matched. (6). At the end of one of the steel pipe piles, a plurality of strip-shaped flat plates having pin insertion holes are circled on the inner peripheral surface so that the pin insertion holes protrude from the end of the steel pipe pile and a slight gap is formed between adjacent flat plates. The inner joint material is formed by being fixed in an annular shape, and the end of the other steel pipe pile has an inner diameter slightly larger than the virtual outer diameter of the inner joint material, is thicker than the steel pipe pile base material, and has a rectangular shape when fitted. An outer joint tube having a pin insertion hole is fixed at a position corresponding to the pin insertion hole of the flat plate, the outer joint tube is fitted to the inner joint material, and the pin insertion holes of the inner joint material and the outer joint tube are aligned. A method for joining steel pipe piles, wherein a fixing pin is inserted into the pin insertion hole and fixed. (7). In (1), (3), (4) or (5),
A backing material having a bolt hole is fixed inside the pin insertion hole provided in the inner joint pipe or the strip-shaped flat plate fixed to the end of one steel pipe pile, and the inner joint tube or the strip-shaped flat plate is fixed. The fixing pin is inserted with the fitting tube fitted,
A joint structure for steel pipe piles, wherein a pin fixing bolt penetrating a bolt hole provided at the center of the pin is fixed to the bolt hole of the backing material. (8). In (2) or (6), a backing material having a bolt hole is fixed inside a pin insertion hole provided in an inner joint pipe or a strip-shaped flat plate fixed to an end of one steel pipe pile. After inserting the fixing pin into the pin insertion hole where the fitting tube or strip-shaped flat plate and the outer joint tube are fitted and matched, the pin fixing bolt is passed through the bolt hole provided at the center of this fixing pin, and A method for joining steel pipe piles, comprising fixing with fixing bolts to prevent falling off of a fixing pin. (9). (7) The joint structure for steel pipe piles, wherein a concave portion is formed at an outer end of the fixing pin, the concave portion including the head of the fixing bolt inserted into the fixing pin and fixed to the backing material and fixed therein. .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, basically,
An inner joint pipe or an inner joint material having a pin insertion hole is fixed to an inner peripheral surface of an end of one steel pipe pile to be joined so that the pin insertion hole protrudes from the pile end, and a steel pipe is attached to an end of the other steel pipe pile. An outer joint pipe thicker than the pile base material and having a pin insertion hole matching the pin insertion hole of the inner joint pipe or inner joint material is fixed, and the outer joint pipe is fitted to the outer peripheral surface of the inner joint pipe or inner joint material. To match the pin insertion holes of the inner joint pipe or inner joint material and the outer joint pipe,
One steel pipe pile and the other steel pipe pile are joined by inserting and fixing a fixing pin into the pin insertion hole. This steel pipe pile is connected when one steel pipe pile is installed in the ground and then the other steel pipe pile is bonded thereto, or before the other steel pipe pile is installed in the ground, the other steel pipe pile is The present invention can be applied to both cases of joining. In the present invention, since the axial force of the steel pipe pile is basically transmitted by the shearing force of the fixing pin inserted through the inner joint pipe or the inner joint material and the outer joint pipe, a joint structure having a large joint strength is provided. Can be easily obtained.

According to the present invention, the size of the pin insertion hole and the pin insertion hole of the inner joint pipe or the inner joint material and the outer joint pipe when the inner joint pipe or the inner joint material and the outer joint pipe are fitted and set up. It is necessary to precisely align the position of the pin insertion hole so that it matches inside and outside, but this pin insertion hole may be separately formed in the inner joint pipe and the outer joint pipe in advance. In a state where the fitting of the inner joint pipe or the inner joint material and the outer joint pipe is stabilized, the inner joint pipe or the inner joint material and the outer joint pipe are simultaneously formed to form pin insertion holes for the inner joint pipe and the outer joint pipe. It is also effective to ensure that the values match.

In the present invention, an outer joint pipe thicker than the steel pipe pile base material is fixed to the end of the other steel pipe pile, and the outer joint pipe has a thickness necessary to compensate for a cross-sectional defect due to the pin insertion hole. Cut the meat steel pipe to a predetermined length, by various joining means,
It is to be fixed to the end face of the other steel pipe pile, and it is preferable that the outer peripheral face of the joint end is processed so as not to cause a remarkable level difference with the outer peripheral face of the steel pipe pile. It is preferable that the outer joint pipe and the inner joint pipe or the inner joint material be mass-produced in a factory in advance and joined to the end face of the steel pipe pile and the inner peripheral face of the end of the steel pipe pile.

This inner joint pipe or inner joint material is formed by forming a pin insertion hole and inserting a fixing pin to fix it.
Set the forming conditions so that the strength of the steel pipe pile is higher than the strength of the steel pipe pile with the fixing pin inserted, and when joining to the steel pipe pile, consider various joining conditions considering the joint conditions and the required joint strength etc. Choose from the means.

When the inner joint material 12 is formed on one steel pipe pile, a plurality of strip-shaped flat plates are arranged in an annular shape, and the inside thereof is temporarily fixed to a ring-shaped backing material or the like beforehand. It is also effective to fix a strip-shaped flat plate to one steel pipe pile. Further, since the fixing pin transmits the axial force of the steel pipe pile by its shearing force, so that it can withstand the assumed maximum shearing force, and a range that does not reduce the overall strength of the inner joint pipe or the inner joint material, Set conditions such as diameter, arrangement, and number. Usually, this fixing pin can be a solid or cylindrical one with a circular cross section made of general structural steel or high-strength steel, inserted into the pin insertion hole and fixed to prevent falling off. It is preferable to secure the function stably. For fixing the fixing pin, for example, spot welding on the outer side of the outer joint pipe, inserting a pin fixing bolt into the fixing pin, and fixing to the inner joint pipe or the inner joint material through the pin fixing bolt, etc. A method can be used.

Hereinafter, each invention of the present invention will be described.
The invention of (1) and (2) is positioned as a basic structural example of the present invention, and one end of one steel pipe pile is
An inner joint pipe with a pin insertion hole is fixed so that the pin insertion hole protrudes from the pile end, and the inner diameter of the other steel pipe pile is thicker than the steel pipe pile base material and larger than the outer diameter of the inner joint pipe. The outer joint pipe having a pin insertion hole is fixed, and the fixing pin is inserted into the pin insertion hole of the inner joint pipe and the outer joint pipe which are fitted by fitting the outer joint pipe to the outer peripheral surface of the inner joint pipe. By fixing
This is to join one steel pipe pile and the other steel pipe pile, and the axial force of the steel pipe pile is transmitted by the shearing force of the inner joint pipe, the outer joint pipe, and the fixed pin inserted through it, A high-strength joint structure can be easily obtained. The pin insertion holes may be separately formed in the inner pipe and the outer pipe at the same time, but are formed simultaneously in the inner pipe and the outer pipe with the fitting of the inner pipe and the outer pipe being stable. It is effective to do.

When the inner joint pipe is fixed to the end of one steel pipe pile, the outer peripheral surface of the inner joint pipe may be fitted to the inner peripheral surface of one steel pipe pile and fixed by joining. In order to easily fix the inner joint pipe from the outside, a thick short pipe having an outer diameter substantially equal to the outer diameter of the steel pipe pile is fixed to the end of one steel pipe pile by joining. The inner joint pipe may be fixed to the short pipe by joining. In this case, the joining end of one steel pipe pile is strengthened, and the joining operation is easier than the case where the inner joint pipe is fitted to the inner peripheral surface of the one steel pipe pile.

In the invention of (3), in the invention of (1), when the inner joint pipe is fixed to one of the steel pipe piles, a plurality of cutouts having open ends are formed on the side of the inner joint pipe fixed to the steel pipe pile. This notch can be fixed to the steel pipe pile by fillet welding, facilitating welding work and increasing the welding length, so the inner joint pipe and steel pipe pile are firmly fixed. can do.

According to the invention of (4), in the invention of (1), the inner joint pipe fixed to the inner peripheral surface at the end of one of the steel pipe piles is divided in the circumferential direction and is provided on the fixed side with the steel pipe pile. It is formed by a plurality of arcuate division plates having a plurality of notches with open ends, and a circle is formed on the inner peripheral surface of one steel pipe pile end so that a slight gap is formed between adjacent arcuate division plates. It is fixed in an annular shape.

When the inner joint pipe is fixed to the inner peripheral surface of one steel pipe pile, the outer diameter of the inner joint pipe and the inner diameter of the steel pipe pile are determined as follows.
Although a certain level of processing accuracy is required, in this invention,
After dividing the inner joint pipe into a plurality of pieces in the circumferential direction, the inner joint pipe can be fixed so as to be inscribed in the steel pipe pile, so that the accuracy of the outer diameter of the inner joint pipe can be considerably reduced, thereby reducing the processing cost. Further, a plurality of notches whose ends are open can be formed between the arc-shaped divided plates, and this notch portion can be fixed to the steel pipe pile by fillet welding as in the invention of (3). Since the work becomes easy and the welding length can be lengthened, the inner joint pipe and the steel pipe pile can be firmly fixed.

In the inventions of (5) and (6), a plurality of strip-shaped flat plates having pin insertion holes are provided between the adjacent arc-shaped split plates instead of the inner joint pipe on the inner peripheral surface of one end of the steel pipe pile. An inner joint member fixed in an annular shape so that a slight gap is formed is used. In the present invention, since the inner joint material is formed by a plurality of strip-shaped flat plates, the processing as in the above-described invention does not require a troublesome inner joint pipe, so that the processing cost can be reduced.

In the inventions (7) and (8), (1)
In any one of the inventions of (1) to (6), a backing material having a bolt hole is fixed to an inner side of a pin insertion hole provided in an inner joint pipe or an inner joint member fixed to an end of one steel pipe pile. After inserting the fixing pin into the pin insertion hole with the outer joint material fitted to the inner joint pipe or inner joint material, back up the pin fixing bolt that has passed through the bolt hole provided at the center of the fixing pin. By fixing the fixing pin to the bolt hole of the material, the fixing pin can be fixed and prevented from falling off, and the bonding strength can be stabilized.

According to the invention of (9), in the invention of (7), a head portion of the pin fixing bolt inserted into the fixing pin, fixed to the backing material and fixed is included in the outer end of the fixing pin. A recess is formed so as to include the head of the fixing bolt, and the pin fixing bolt does not protrude from the outer surface of the steel pipe pile.

[0019]

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. This example shows a joining structure example of the steel pipe piles according to the inventions of (1) and (2) when the present invention is applied and one steel pipe pile buried in the ground is joined to the other steel pipe pile. It is.

In FIG. 1A, reference numeral 1 denotes one steel pipe pile buried in the ground, and an inner joint pipe 3 is provided on an inner peripheral surface at an upper end thereof.
Are fitted so that the formation regions of the plurality of pin insertion holes 3p protrude from the pile ends and fixed by welding w. FIG.
In (b), reference numeral 2 denotes another steel pipe pile joined to one steel pipe pile 1, and the lower end face thereof has an inner diameter larger than the outer diameter of the inner joint pipe 3 of one steel pipe pile 1 and has a steel pipe pile mother. The outer joint pipe 4 which is thicker than the material and forms a plurality of pin insertion holes 4p that match the pin insertion holes 3p of the inner joint pipe 3 when fitted in the circumferential direction thereof is fixed by welding w. Here, the pin insertion hole 3p of the inner joint pipe 3 and the pin insertion hole 4p of the outer joint pipe 4 of the other steel pipe pile 2 are inserted into the outer joint pipe 4 after the inner joint pipe 3 and the outer joint pipe 4 are fitted. Formed simultaneously with a diamond cutter or the like from the outside.

FIG. 2 shows an example of a joint structure of a steel pipe pile formed by joining one steel pipe pile 1 and the other steel pipe pile 2. In this joint structure example, the outer joint pipe 4 of the other steel pipe pile 2 is fitted to the inner joint pipe 3 of the one steel pipe pile 1 installed in the ground, and the inner joint pipe 3 is simultaneously formed from the outside and matched. A fixing pin 5 is inserted into each of the pin insertion holes 3p of the joint pipe 3 and each of the pin insertion holes 4p of the outer joint pipe 4 to penetrate the distal end into the inside, so that one steel pipe pile 1 and the other steel pipe pile are inserted. 2 are joined. Each of the fixing pins 5 can be fixed to the outer joint pipe 4 by spot welding sp or the like as necessary to prevent falling off.

The joint structure of the steel pipe pile is obtained, for example, as follows. a. At the factory, with one steel pipe pile 1 lying down,
An inner joint pipe 3 manufactured in advance is fixed to the inner peripheral surface of the end portion by welding w. b. At the factory, with the other steel pipe pile 2 lying down,
An outer joint pipe 4 manufactured in advance is fixed to the end by welding w. c. After the inner joint pipe 3 of the steel pipe pile 1 and the outer joint pipe 4 of the steel pipe pile 2 are stably fitted at the factory, a plurality of pin insertion holes 4p and 3p are formed from the outside of the outer joint pipe 4 with a diamond cutter or the like. Simultaneously pierce and transport to the site. d. One steel pipe pile 1 is embedded so that the inner joint pipe 3 protrudes upward. (The installation method is omitted) e. A gantry is constructed around the one steel pipe pile 1. f. The other steel pipe pile 2 is suspended by a crane, and the outer joint pipe 4p is fitted to the inner joint pipe 3 of one steel pipe pile 1 buried in the ground and fixed on a gantry. g. A fixing pin 5 is inserted into the pin insertion holes 4p and 3p, and the tip of the fixing pin 5 penetrates to the inside of the inner joint pipe 3, and the fixing pin 5 is fixed to the outside of the outer joint pipe 4 by spot welding. In this way, one steel pipe pile 1 and the other steel pipe pile 2 can be firmly joined at the construction site.

FIG. 3 shows an example of a joint structure of steel pipe piles according to another embodiment of the present invention. In this example, when the inner joint pipe 3 is fixed to the end of one steel pipe pile 1, the inner joint pipe 3 is fixed.
A thick short pipe 6 having an outer diameter substantially the same as the outer diameter of the steel pipe pile is fixed to the end of one of the steel pipe piles 1 by joining so that the outer pipe can be easily joined from the outside. The inner joint pipe 3 is joined and fixed to the pipe to strengthen the joint end of the one steel pipe pile 1, and the joining work is performed more than when the inner joint pipe 3 is fitted to the inner peripheral surface of the one steel pipe pile. It is also easy. The fitting of the inner joint pipe 3 and the outer joint pipe 4 and the pin insertion hole 3
The formation of p and 4p and the fixing by the fixing pin 5 are the same as in the case of the joint structure in FIG.

(Embodiment 2) This embodiment 2 shows another example of the joint structure of the steel pipe pile according to the invention of (3).
Basically, it is characterized by using the inner joint pipe in which the lower shape of the inner joint pipe 3 fitted and fixed to one steel pipe pile 1 shown in the first and second embodiments is changed. . Since the other steel pipe pile 2 has the same structure as that of the above embodiment and is joined to one steel pipe pile 1 in the same manner as the above embodiment, here, a structural example of one steel pipe pile 1 will be described. Only the description will be made with reference to FIGS.

In FIG. 4 (a), reference numeral 7 denotes an inner joint pipe fitted and fixed to the end of one of the steel pipe piles 1, and has a plurality of pin insertion holes 7p formed in the upper region in the circumferential direction. A plurality of cutouts 8 having open ends are provided in a lower region in which one of the steel pipe piles 1 is fitted and fixed, and as shown in FIG. Pin insertion hole 7p on the peripheral surface
Fig. 5
As shown in the figure, the plurality of notches 8 formed in the lower region are also fixed to the inner peripheral surface of one of the steel pipe piles 1 by welding w, and the notch 8 ensures a sufficient welding w length. It is possible to firmly adhere to one steel pipe pile 1.

(Embodiment 3) This embodiment 3 shows another example of the joint structure of the steel pipe pile according to the invention of (4).
Basically, as shown in the first and second embodiments, the upper region has a plurality of pin insertion holes 3p formed in the circumferential direction in the upper region,
This is a divided inner joint pipe formed by dividing the inner joint pipe 7 having a plurality of notches 8 formed in a lower region. The other steel pipe pile 2 has the same structure as that of the above-described embodiment, and is joined to one steel pipe pile 1 in the same manner as in each of the above embodiments. Will be described with reference to FIGS.

In FIG. 6 (a), reference numeral 9 denotes a split-type (here, three-split) inner joint pipe having a plurality of arc-shaped pipes having a pin insertion hole 9p forming portion in an upper region and a notch 10 formed in a lower region. The arc-shaped split plate 9x is fixed to the inner peripheral surface of one end of the steel pipe pile 1 in an annular shape.

The plurality of arcuate split plates 9x are shown in FIG.
As shown in (1), a slight gap 11 is formed between the adjacent arc-shaped divided plates 9x on the inner peripheral surface at the end of one steel pipe pile 1, and the region where the pin insertion hole 9p is formed protrudes from the pile end. 7 and fixed to the inner peripheral surface of one of the steel pipe piles 1 by welding w at the gap formed between the notch 10 formed in the lower region and the adjacent arc-shaped divided plate 9x as shown in FIG. The gap w formed between the arcuate split plates 9x and the notch 10 can sufficiently secure the welding w length, and the arcuate split plate 9x is firmly fixed to one steel pipe pile 1. It is possible to In addition, since the inner joint pipe is divided and fixed, the manufacturing accuracy of the inner joint pipe is reduced, and the processing cost can be reduced.

(Embodiment 4) This embodiment 4 is based on (5)
FIG. 9 shows another example of a joint structure of a steel pipe pile according to the invention of (6), and is basically an inner joint that is fitted and fixed to one of the steel pipe piles 1 shown in the first to third embodiments. Instead of a tube,
A plurality of strip-shaped flat plates 12 are provided on the inner peripheral surface of one end of one steel pipe pile 1.
The inner joint member 12 made of x is fixed. 8 and 9 show examples of the joint structure of the steel pipe pile in this example.
It will be described based on.

In FIG. 8A, reference numeral 12x denotes a strip-shaped flat plate having two upper and lower pin insertion holes 12p formed in advance in the upper region. On the other hand, a plurality of sheets are annularly arranged and fixed in the circumferential direction to form the inner joint member 12 as shown in FIG. 8B.

As shown in FIG. 8 (b), the strip-shaped flat plate 12x is formed on the inner peripheral surface of one end of one steel pipe pile 1 with respect to the inner peripheral surface.
A small gap 13 is formed between the strip-shaped flat plates 12x adjacent in the circumferential direction, and the pin insertion holes 12p are formed in an annular shape so as to protrude from the end of the pile and fixed by welding w to form an inner joint. The material 12 was used. In the inner joint material 12, as shown in FIG. 9, a sufficient welding w length can be secured by the gap 13 formed between the adjacent strip-shaped flat plates 12x, and the strip-shaped flat plate 12x is connected to one of the strip-shaped flat plates 12x. It can be firmly fixed to the steel pipe pile 1.

In FIG. 8C, reference numeral 2 denotes one steel pipe pile 1
The lower end face of the steel pipe pile has an inner diameter larger than the virtual outer diameter of the inner joint member 12 of the one steel pipe pile 2, is thicker than the steel pipe pile base material, and has a circumferential direction. The outer joint pipe 4 in which a plurality of pin insertion holes 4p corresponding to the pin insertion holes 12p of the inner joint material 12 are formed in two rows at the top and bottom at the time of fitting, is fixed by welding w. Here, the pin insertion hole 12p of the inner joint material 12 and the pin insertion hole 4p of the outer joint pipe 4 of the other steel pipe pile 2 are formed in advance.

FIG. 9 shows an example of a joint structure of a steel pipe pile formed by joining one steel pipe pile 1 and the other steel pipe pile 2 formed as described above. In the joint structure example in this example, the inner joint material 12 of one steel pipe pile 1 buried in the ground is used.
Then, each pin insertion hole 12p of the inner joint material 12 (strip-shaped flat plate 12x) formed in advance by fitting the outer joint pipe 4 of the other steel pipe pile 2 is matched with each pin insertion hole 4p of the outer joint pipe 4. Then, the fixing pin 5 is inserted into each of the pin insertion holes, and the tip is penetrated to the inside, whereby the one steel pipe pile 1 and the other steel pipe pile 2 are joined. Each of the fixing pins 5 can be fixed to the outer joint pipe 4 by spot welding sp or the like as necessary to prevent falling off.

The joint structure of the steel pipe pile is obtained, for example, as follows. a. At the factory, the plate material is cut into a strip-shaped flat plate, and a plurality of pin insertion holes 12p are drilled in the strip-shaped flat plate to manufacture a strip-shaped flat plate 12x. A plurality of strip-shaped flat plates 12x are arranged on the peripheral surface and fixed by welding w to form the inner joint material 12, which is conveyed to the construction site. (A plurality of strip-shaped flat plates 12x may be fixed in advance with a ring-shaped backing material.) B. At the factory, with the steel pipe pile laid down, the outer joint pipe 4 previously manufactured and having a plurality of pin insertion holes 4p fixed to the end thereof by welding w to form the other steel pipe pile, and transported to the construction site I do. c. One steel pipe pile 1 is buried in the ground so that the inner joint material 12 projects upward. (The installation method is omitted) d. A gantry is constructed around the one steel pipe pile 1. e. The other steel pipe pile 2 is suspended by a crane, and the outer joint pipe 4p is buried in the ground. The inner joint material 12 of one steel pipe pile 1 is provided with a pin insertion hole 12p of the inner joint material 12 (a strip-shaped flat plate 12x).
And the pin insertion hole 4p of the outer joint pipe 4 is fitted and fitted, and fixed on the gantry. f. The fixing pin 5 is inserted into the pin insertion holes 12p and 4p, and the tip of the fixing pin 5 penetrates to the inside of the inner joint member 12, and the fixing pin 5 is fixed to the outside of the outer joint pipe 4 by spot welding. In this way, one steel pipe pile 1 and the other steel pipe pile 2 can be firmly joined at the construction site.

(Embodiment 5) This embodiment 5 is based on (7)
It shows another example of the joint structure of steel pipe piles according to the invention of (8), and is basically applicable to the example of the joint structure of steel pipe piles obtained in the first to fourth embodiments. When the inner joint pipes 3, 7, 9 or the inner joint material 12 fixed to the steel pipe pile 1 and the outer joint pipe 4 of the other steel pipe pile are fitted, and the fixing pin 5 is inserted into the matched pin insertion hole. At
The present invention is characterized by a fixing pin fixing structure for preventing the fixing pin from falling off.

Here, in the joint structure example of the steel pipe pile of the fourth embodiment, the outer joint pipe 4 of the other steel pipe pile 2 is fitted to the inner joint material 12 fixed to the inner peripheral surface of the end of one steel pipe pile 1. An example of a structure in which the fixing pin 5 inserted into each of the matched pin insertion holes is fixed will be described with reference to FIG. In this example, as shown in FIG. 10 (b), the fixing pin 5 has a bolt hole 5p penetrating in the center, and a pin fixing bolt 14 having a threaded portion 14s formed at the tip of the bolt hole 5p. Can be inserted.

As shown in FIG. 10 (a), the inner joint member 12 is a ring-shaped backing material before a plurality of strip-shaped flat plates 12x are fixed to the inner peripheral surface of one end of the steel pipe pile 1. 15, a plurality of strip-shaped flat plates 12x are formed in an annular shape and then fixed to one of the steel pipe piles 1. This ring-shaped backing material 15 is used to insert a pin into each strip-shaped flat plate 12x. The screw portion 14s of the fixing bolt 14 is located at a position corresponding to the hole 12p.
Is formed with a screw hole 15s.

The outer joint pipe 4 of the other steel pipe pile 2 is fitted to the inner joint material 12 fitted and fixed to the inner peripheral surface of the end of one steel pipe pile 1, and each pin insertion hole 12 p matched with the inner joint material 12. After the fixing pin 5 is inserted into each of the pin insertion holes 4p, the pin fixing bolt 14 is inserted into the bolt hole 5p of the fixing pin 5, and the tip screw portion 14s of the pin fixing bolt 14 is attached to the ring-shaped backing material 1.
By fixing the fixing pin 5 to the ring-shaped backing material 15 by screwing the fixing pin 5 into the screw hole 15 s, the falling off of the fixing pin 5 can be prevented, and the function of the fixing pin 5 can be secured stably.

(Embodiment 6) Embodiment 6 shows another example of the joint structure of the steel pipe pile according to the invention of (9).
Basically, the present invention is applicable to the example of the joint structure of the steel pipe piles obtained in the first to fifth embodiments and is applicable to the inner joint pipes 3 and 7 or the inner joint material 12 fixed to one steel pipe pile 1. In the case where the fixing pin 5 is inserted into the pin insertion hole in which the outer joint pipe 4 of the other steel pipe pile 2 has been fitted and fitted, the fixing pin has a fixing pin fixing structure for preventing the fixing pin from falling off. Things.

In this example, as shown in FIG. 11, as in the fifth embodiment, a fixing pin 5 is provided with a screw hole 14s formed at the tip end in a bolt hole 5p penetrating the center thereof. 14 is inserted and screwed into the screw hole 15s of the ring-shaped backing material 15 fixed to the inner peripheral surface of the inner joint material 12 fixed to the inner peripheral surface of the end of one steel pipe pile 1 to fix the fixing pin 5 At this time, the ring-shaped backing material 1 is inserted into the outer end of the fixing pin 5 so that the head of the pin fixing bolt 12 does not protrude from the outer peripheral surface of the one steel pipe pile 1.
5 is formed with a concave portion 16 enclosing the head of a pin fixing bolt 14 fixed and fixed to the pin 5. This consideration is made in the case where one steel pipe pile 1 and the other steel pipe pile 2 are joined and this joint is installed in the ground, the pin fixing bolt 14 is damaged, and corrosion tends to progress in this part. This is effective for preventing trouble such as shortening of the service life.

The joining structure and the joining method of the present invention are not limited to the above examples. For example, the structural conditions of the steel pipe piles used, the structural conditions of the inner joint pipe or inner joint material, the structural conditions of the outer joint pipe, processing and joining conditions, fixing pins and their fixing structures, construction procedures, etc. It is changed within the range that satisfies the claims according to the object condition, the load condition, the required supporting pressure condition, the burying construction condition, and the like.

[0042]

According to the present invention, since the axial force of the steel pipe pile is basically transmitted by the shearing force of the fixing pin inserted through the inner joint pipe or the inner joint material and the outer joint pipe, the joint is transmitted. A joint structure of steel pipe piles with high strength can be easily obtained even at the construction site, and the construction period and the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1A is a three-dimensional explanatory view showing a structural example of one steel pipe pile used in a joint structure example of a steel pipe pile of the present invention, and FIG. 1B is a joint structural example of a steel pipe pile of the present invention. The three-dimensional explanatory drawing which shows the structural example of the other steel pipe pile used.

FIG. 2 is a partially cutaway side sectional explanatory view showing an example of a joint structure of a steel pipe pile according to the present invention.

FIG. 3A is a three-dimensional explanatory view showing another example of the structure of one steel pipe pile used in another example of the joint structure of the steel pipe pile according to the present invention;
(B) is a partially cutaway side sectional explanatory view showing another example of the joint structure of the steel pipe pile of the present invention.

FIG. 4A is a three-dimensional explanatory view showing a structural example of an inner joint pipe of one steel pipe pile used in another structural example of a steel pipe pile according to the present invention, and FIG. 4B is a diagram of FIG. FIG. 4 is a three-dimensional explanatory view showing a structural example of one steel pipe pile used in the joint structure example of the steel pipe pile of the present invention to which the inner joint pipe is fixed.

FIG. 5 is a partially cutaway cross-sectional explanatory view showing another example of a joint structure of a steel pipe pile according to the present invention.

FIG. 6A is a three-dimensional explanatory view showing a structural example of an inner joint pipe of one steel pipe pile used in another structural example of the steel pipe pile of the present invention, and FIG. 6B is a diagram of FIG. FIG. 4 is a three-dimensional explanatory view showing a structural example of one steel pipe pile used in the joint structure example of the steel pipe pile of the present invention to which the inner joint pipe is fixed.

FIG. 7 is a partial cross-sectional side view showing another structural example of the present invention.

FIG. 8A is a three-dimensional explanatory view showing a structural example of a strip-shaped flat plate forming an inner joint material of one steel pipe pile used in another structural example of the steel pipe pile according to the present invention, and FIG. (A) is a three-dimensional explanatory view showing an example of the structure of one steel pipe pile used in the example of the joining structure of the steel pipe pile of the present invention in which the inner joint material using the strip-shaped flat plate is fixed, and (c) is The three-dimensional explanatory drawing which shows the structural example of the other steel pipe pile used in the example of the joining structure of the steel pipe pile of this invention.

FIG. 9 is a partially cutaway cross-sectional explanatory view showing another example of a joint structure of a steel pipe pile according to the present invention.

FIG. 10A is a three-dimensional explanatory view showing a structural example of one steel pipe pile used in another structural example of the steel pipe pile according to the present invention, and FIG.
The figure shows one example of a fixing structure of a fixing pin in another steel pipe pile structure example of the present invention using one steel pipe pile shown in FIG. 8A and the other steel pipe pile shown in FIG. 8C. FIG.

FIG. 11 is a view showing another example of the pin fixing bolt insertion structure used in the fixing pin fixing structure of the other example of the steel pipe pile joining structure of the present invention as shown in FIGS. 10 (a) and (b). Part side sectional enlarged explanatory drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 One steel pipe pile 2 The other steel pipe pile 3 Inner joint pipe 3p pin insertion hole 4 outer joint pipe 4p pin insertion hole 5 fixing pin 5p bolt insertion hole 6 short pipe 7 inner joint pipe 7p pin insertion hole 8 notch 9 inner joint pipe 9x Arc-shaped split plate 9p Pin insertion hole 10 Notch 11 Gap 12 Inner joint material 12x Strip-shaped flat plate 12p Pin insertion hole 13 Gap 14 Pin fixing bolt 14s Screw part 15 Ring-shaped backing material 15s Screw hole 16 Recess

Continued on the front page (72) Inventor Noriyuki Kawabata 2-6-3 Otemachi, Chiyoda-ku, Tokyo F-term in Nippon Steel Corporation (reference) 2D041 AA02 CA03 CB06 DB02 DB13

Claims (9)

[Claims] An inner joint pipe having a pin insertion hole at an end thereof is fixed to one of the steel pipe piles such that the pin insertion hole protrudes from an end of the steel pipe pile, and an inner diameter larger than an outer diameter of the inner joint pipe is formed at the end. The other steel pipe pile having a pin insertion hole that is thicker than the steel pipe pile base material and has a pin insertion hole that matches the pin insertion hole of the inner joint pipe at the time of fitting is fixed to the inner joint pipe and the outer joint pipe portion. Characterized in that the inner joint pipe and the outer joint pipe are fixed with a fixing pin inserted into a pin insertion hole aligned with the inner pipe. 2. An inner joint pipe having an outer diameter and a pin insertion hole which is inscribed in the steel pipe pile, and a fitting portion in which the pin insertion hole protrudes from an end of the steel pipe pile is formed at one end of the steel pipe pile. The other end of the steel pipe pile has an inner diameter larger than the outer diameter of the inner joint pipe, is thicker than the steel pipe pile base material, and matches the pin insertion hole of the inner joint pipe when fitted. An outer joint tube having a pin insertion hole is fixed to the inner joint tube, and the inner joint tube and the outer joint tube are fitted to match the pin insertion holes of the inner joint tube and the outer joint tube, and a fixing pin is inserted into the pin insertion hole. A method of joining steel pipe piles, characterized in that the piles are fixed. 3. An inner joint pipe fixed to an end of one of the steel pipe piles has an outer diameter slightly smaller than the inner diameter of the steel pipe pile, and has a plurality of open ends at the fixing side with the steel pipe pile. The joint structure for a steel pipe pile according to claim 1, wherein a notch is provided, and the notch is fixed to an inner peripheral surface of an end of the steel pipe pile. 4. An inner joint pipe fixed to an end of one steel pipe pile, a plurality of arc-shaped split plates having a plurality of cutouts having open ends on the side fixed to the steel pipe pile, and a plurality of arc-shaped split plates between adjacent arc-shaped split plates. The joint structure for steel pipe piles according to claim 1, wherein the steel pipe piles are fixed to the inner peripheral surface of one end of the steel pipe pile in an annular shape so that a slight gap is formed. 5. A plurality of strip-shaped flat plates having pin insertion holes are annularly fixed to the inner peripheral surface such that the pin insertion holes protrude from the end of the steel pipe pile and a slight gap is formed between adjacent flat plates. A steel pipe pile having an inner joint material formed as described above, and a strip-shaped flat plate pin insertion hole having an inner diameter slightly larger than the virtual outer diameter of the inner joint material and being thicker than the steel pipe pile base material when fitted. The other steel pipe pile to which the outer joint pipe having the pin insertion hole matching the inner pipe is fixed at the inner joint material and the outer joint pipe portion is inserted into the pin insertion hole where the inner joint material and the outer joint pipe match. A joint structure for steel pipe piles, which is fixed with fixed fixing pins. 6. A plurality of strip-shaped flat plates having pin insertion holes at one end of one steel pipe pile such that the pin insertion holes protrude from the end of the steel pipe pile and a slight gap is formed between adjacent flat plates. An inner joint material is formed by being fixed to the inner peripheral surface in an annular shape, and the other end of the steel pipe pile has an inner diameter slightly larger than the virtual outer diameter of the inner joint material and is thicker than the steel pipe pile base material. At the time of fitting, an outer joint tube having a pin insertion hole is fixed at a position corresponding to the pin insertion hole of each strip-shaped flat plate, the outer joint tube is fitted to the inner joint material, and the pins of the inner joint material and the outer joint tube are fitted. A method for joining steel pipe piles, wherein the insertion holes are matched, and a fixing pin is inserted and fixed in the pin insertion hole. 7. A backing material having a bolt hole is fixed inside an inner joint pipe fixed to an end of one steel pipe pile or a pin insertion hole provided in a strip-shaped flat plate. Alternatively, a fixing pin is inserted in a state where a strip-shaped flat joint pipe is fitted, and a pin fixing bolt penetrating a bolt hole provided at the center of the pin is fixed to a bolt hole of a backing material. Claim 1, Claim 3, Claim 4,
A joint structure for a steel pipe pile according to claim 5. 8. An inner joint pipe fixed to the end of one steel pipe pile or a backing material having a bolt hole inside a pin insertion hole provided in a strip-shaped flat plate, and the inner joint pipe or strip is fixed. After the fixing pin is inserted into the pin insertion hole where the flat plate and the outer joint pipe are fitted and matched, the pin fixing bolt is passed through the bolt hole provided at the center of this fixing pin, and the backing material bolt The method for joining steel pipe piles according to claim 2 or 6, wherein the fixing pin is fixed by a hole to prevent the fixing pin from falling off. 9. The fixing pin according to claim 7, wherein a concave portion is formed at an outer end portion of the fixing pin, the concave portion including a head of the fixing bolt inserted into the fixing pin and fixed to the backing material and fixed thereto. Steel pipe pile joint structure.