JPH09143984A - Vertical splicing method for steel pipe pile having joint member and guide jig for therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate aligning in vertical splicing of steel pipe piles having joint members. SOLUTION: A steel pipe pile 1 having joint members 3, 4 is inserted in an excavation hole 15 and supported while the head remains protruding over the ground surface. For this pile (lower pile member 1b), a guide jig 7 furnished with a pair of upright guide pieces 9, 9 is placed on the ground in the condition that loose fit recess 11 and small diametric groove 13 surround the joint members 3, 4, and an upper pile 1a is hung down. The joint members 3, 4 are inserted in the grooves 13, 13, and the upper pile 1a is joined with the lower pile 1b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for vertically connecting steel pipe piles having joint members and a guide jig for vertical connection used for the method.

[0002]

2. Description of the Related Art A vertical joint (body joint) by welding steel pipe piles together is carried out by hanging the upper pile with a crane and abutting the lower pile inserted in the buried hole when the site is narrow. The method of doing is adopted.

When such a vertical joint is carried out on a steel pipe pile having a joint member in the longitudinal direction of the outer periphery, such as used for a steel pipe column soil retaining wall, the axial alignment of the upper pile and the lower pile to be joined is performed. Not only this, it is necessary to align the joint members in the pipe circumferential direction so that the upper piles can be rotated by hanging a cargo handling carrier such as a chate ton or nylon sling on the lower end of the piles. I am going.

[0004]

However, in such a conventional method, it is difficult to rotate the upper pile by a unit of a minute mm due to the friction with the backing ring of the lower pile generated when the upper pile is installed. In addition, the shaking of the suspended upper pile also affects the alignment, which requires a lot of labor and time for alignment. Therefore, the improvement of the alignment work in the vertical connection has been a big problem.

The present invention was made in order to solve the above-mentioned conventional problems, and by using a guide jig,
An object of the present invention is to make it possible to easily and efficiently vertically connect steel pipe piles having joint members.

[0006]

The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. Steel pipe pile 1 (1
b) is inserted into the excavation hole 15 and its head is projected and supported on the ground, while a guide 9 having a small-diameter groove 13 into which the joint members 3 and 4 are inserted is erected on the base plate 8. Jig 7
After forming the guide jig 7 on the ground with the small-diameter groove 13 along the outside of the joint members 3 and 4 of the lower pile 1b which is the steel pipe pile 1, the lower pile 1b is formed. The upper pile 1a is hung on the upper side, the joint members 3 and 4 thereof are inserted into the small-diameter concave groove 13, and the upper pile 1a is joined to the lower pile 1b.

Further, the guide jig according to claim 2 is a semicircular encircling recessed portion 10 that encloses a substantially half peripheral portion of the steel pipe pile main pipe 2, and the joint members 3, 4 of the steel pipe pile 1 in the central portion of the enclosing recessed portion 10. On a pair of base plates 8 and 8 provided with the loose fitting recesses 11 of the above, a small-diameter recessed groove 13 having substantially the same shape as the surrounding recessed portion 10 is vertically formed, and a dielectric 9 is vertically provided. Small diameter groove 13
The upper part of the is formed into a trumpet shape 13a which is inclined upward and expanded outward.

[0008]

[Function] The lower jig 1b having its head protruding to the ground and inserted into the embedding hole 15 is supported, and the guide jigs 7, 7 are provided with the small-diameter grooves 13, 13 on the outside of the joint members 3, 4. Then, the joint members 3, 4 are placed on the ground together with the upper pile 1a being suspended.
Is inserted into both small-diameter concave grooves 13, 13 to join the upper pile 1a to the lower pile 1b.

At this time, even if the joint members 3 and 4 of the upper pile 1a are slightly displaced from the positions of the small-diameter concave grooves 13 and 13 of the guide jigs 7 and 7, the trumpet-like portions 13a of the small-diameter concave groove 13 are not connected to each other. By guiding 3 and 4, the positional deviation is automatically corrected, and the upper and lower piles 1a and 1b are properly positioned and joined in the axial direction and the circumferential direction.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an example of an embodiment, and FIGS. 3 and 4 show a guide jig used in the present invention.

In the present invention, a steel pipe pile 1 is used in which a pair of joint members 3 and 4 are provided in the longitudinal direction of the outer surface of the steel pipe 2.
Generally, as shown in FIG. 2, one joint member 3 is O
The male member having a shaped cross section and the other joint member 4 are female members having a C-shaped cross section, but the present invention is not limited to this type, and various types of joint members 3 and 4 can be applied. It

Further, in the steel pipe pile 1, as shown in FIGS. 1 and 6, the joint members 3 and 4 are longer than the end face of the steel pipe (main pipe) 2 to a position slightly inward for convenience of welding in the vertical joint. It is provided by A groove 5 for welding is formed at the lower end of the steel pipe 2, and a backing ring 6 is provided in the upper end so as to project upward.

In the method of the present invention, the lower pile 1b is inserted into the excavation hole 15 for pile construction, and the head is exposed to the ground to be temporarily fixed.
On the other hand, the upper pile 1a is hung and joined to perform longitudinal connection. At that time, the upper pile 1a and the lower pile 1 are aligned with each other, and particularly, the joint members 3, 3, 4, 4 are aligned with each other. Therefore, a pair of guide jigs 7, 7 is used.

The guide jig 7 includes a base plate 8 mounted on the ground surrounding the excavation hole 15, especially the guide walls 16 for construction, and a pair of dielectrics 9 standing on the base plate 8. It is composed of 9. The base plate 8 has a suitable shape such as a rectangle as a whole, and a semicircular encircling recess 10 that encloses a substantially semi-circumferential portion of the lower pile 1b and a part of the periphery thereof.
A loose fitting recess 11 for the joint members 3 and 4 is further provided in the central portion of the.

The dielectric 9 has a rectangular shape whose plane is smaller than the base plate and has a vertically long cubic shape, and has a large-diameter groove 12 formed on one side thereof so as to follow the enclosing recess 10 of the base plate 8. , A small-diameter groove 13 having substantially the same shape as the loosely fitting recess 11 of the base plate 8 at the center thereof.
And are formed above and below the derivative 9. And, the upper portion of the large-diameter groove 12 and the small-diameter groove 13 respectively, the trumpet-shaped portion 12 that is inclined upward and expands outward.
a and 13a are formed. The derivative 9 is the base plate 8
It may be fixed by welding or the like, but as shown in the figure, it may be detachably attached by using connecting pins 14, 14 and the like.

The lower pile 1b is inserted into the excavation hole 15 and the kanzashi muscle 17 penetrating through the excavation hole 15 is placed on the pedestal 18 provided at the upper part of the excavation hole 15 so that the head has a required length. It is temporarily fixed in a state of protruding to the ground. Then, the pair of guide jigs 7, 7
On the guide walls 16 and 16 and the surrounding recesses 10 and
10 and the large-diameter concave grooves 12, 12 are opposed to each other and brought close to the lower pile 1b, and the loose fitting concave portion 11 and the small-diameter concave groove 13 are wrapped around the joint members 3 and 4 for mounting.

The upper pile 1a, which is vertically connected to the lower pile 1b, is lifted up by a crane and carried directly above the lower pile 1b, and is aligned with the lower pile 1b in an approximately axial direction. The joint members 3 and 4 are lowered while aligning them in the circumferential direction so that the joint members 3 and 4 face the small-diameter concave grooves 13 and 13 of the guide jigs 7 and 7 mounted on the lower pile 1b, and the steel pipe 2 is enlarged. Diameter groove 1
Then, the joint members 3 and 4 are lowered and entered into the small-diameter concave grooves 13 and 13 between the 2 and 12.

In this case, even if the portion of the steel pipe 2 is slightly deviated on the axial line, since the upper part of the large-diameter concave groove 12 has a trumpet shape 12a, the positional deviation is corrected as it descends, and the joint member 3, Even if 4 is slightly displaced from the small-diameter concave grooves 13, 13, since the upper part thereof is a trumpet-shaped 13a, the positional displacement is corrected and the lower pile 1b can be aligned with the joint members 3, 4. . Then, the steel pipes 2, 2 of the upper pile 1a and the lower pile 1b
The end faces of are joined.

After the upper and lower piles 1a and 1b are joined as described above, the guide jigs 7 and 7 are removed. After that,
As shown in Fig. 3, welding 22 is performed along the outer circumference of the joint between the steel pipes 2 and 2 of the upper and lower piles 1a and 1b, and then, between the joint members 3, 3, 4 and 4 of both piles 1a and 1b, the same shape as those If the short connecting materials 19 and 20 are attached by welding 21 and 21, both upper and lower piles 1
The vertical connection of a and 1b will be completed. After the vertical connection, the kizashi muscle 17 is extracted, and the vertically connected upper and lower piles 1a and 1b are inserted into the excavation hole 15.

FIG. 5 shows another embodiment of the guide jig used in the present invention. In this embodiment, the dielectric 9 is vertically divided into several parts (divided into two in the embodiment diagram) 9a,
9b, which are detachably attached by connecting pins 14, 14 and the like. In this case, the trumpet-shaped portions 12a and 13a are omitted from the lower dielectric 9b. Further, at the upper end of the derivative 9,
If necessary, the connecting dielectric 9c having the same height as the upper dielectric 9b can be detachably loaded by the connecting pins 14, 14, etc., and the number of the connecting dielectric 9c can be increased appropriately. . With such a configuration, the guide jig 7 can be compacted during transportation and storage, is convenient for handling, and the height of the dielectric 9 can be adjusted appropriately, so that the joint members 3, 3 of the upper and lower piles 1a, 1b can be adjusted.
It can be widely applied to the vertical connection of various piles having different lengths of 3, 4, and 4.

[0021]

As described above, according to the present invention,
For the lower pile protruding the head to the ground and inserted into the excavation hole,
On the ground, place a pair of guide jigs that stand up the guide member having a small-diameter recessed groove that expands the upper part in a trumpet shape so as to surround the joint member of the lower pile, Since I tried to hang the upper pile while inserting it into the small diameter groove,
Not only the alignment of the upper pile to the lower pile on the axis, but also
Positioning in the circumferential direction can be performed accurately and easily, and the vertical jointing of steel pipe piles having joint members can be performed easily and efficiently.

The guide jig used for this purpose has a simple structure, can be manufactured at low cost, is easy to handle, and can be used again.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an example of an embodiment of the present invention.

FIG. 2 is a plan sectional view of the same.

FIG. 3 is a half perspective view showing an embodiment of a guide jig.

FIG. 4 is a plan view of the same.

FIG. 5 is a perspective view of a half part showing another embodiment.

FIG. 6 is a front view showing a welded state of the upper and lower piles.

[Explanation of symbols]

 1 steel pipe pile 1a upper pile 1b lower pile 2 steel pipe 3,4 joint member 7 guide jig 8 base plate 9 derivative 9a, 9b split derivative 9c connection derivative 10 enclosing recess 11 loose fitting recess 12 large diameter recess 12a trumpet 13 Small-diameter groove 13a Trumpet-shaped part 15 Drilled hole 17 Kanzashi muscle

Claims (2)

[Claims] 1. A small diameter for inserting a steel pipe pile provided with a joint member along a longitudinal direction of an outer surface into an excavation hole so that a head of the steel pipe pile is projected and supported on the ground while the joint member is inserted on a base plate. After forming a guide jig in which a dielectric having a groove is erected upright, this guide jig is placed on the ground with the small diameter groove along the outside of the joint member of the lower pile which is the steel pipe pile. , A method of vertically splicing a steel pipe pile having a joint member, characterized in that the upper pile is hung on the lower pile, the joint member is inserted into the small-diameter concave groove, and the upper pile is joined to the lower pile. . 2. A pair of base plates, each having a semicircular encircling recess that encloses a substantially half circumference of the steel pipe pile main pipe, and a loose fitting recess of a joint member of the steel pipe pile provided in the center of the encircling recess. , A small-diameter groove having substantially the same shape as that of the enclosing concave part is vertically provided in a vertically elongated manner, and the upper part of the small-diameter groove is slanted upward and expanded into a trumpet shape. A guide jig for vertically connecting steel pipe piles having a joint member, which is formed.